Lawn mower handle extender. Lawn mower handle extender

US4104935A. Flat wrench extender tool. Google Patents

Publication number US4104935A US4104935A US05/720,757 US72075776A US4104935A US 4104935 A US4104935 A US 4104935A US 72075776 A US72075776 A US 72075776A US 4104935 A US4104935 A US 4104935A Authority US United States Prior art keywords wrench flat tool handle bar Prior art date 1976-09-07 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired. Lifetime Application number US05/720,757 Inventor Roscoe D. Stoops Original Assignee Stoops Roscoe D Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) 1976-09-07 Filing date 1976-09-07 Publication date 1978-08-08 1976-09-07 Application filed by Stoops Roscoe D filed Critical Stoops Roscoe D 1976-09-07 Priority to US05/720,757 priority Critical patent/US4104935A/en 1978-08-08 Application granted granted Critical 1978-08-08 Publication of US4104935A publication Critical patent/US4104935A/en 1996-09-07 Anticipated expiration legal-status Critical Status Expired. Lifetime legal-status Critical Current

Links

• 239000004606 Fillers/Extenders Substances 0.000 title description 62
• 230000001808 coupling Effects 0.000 claims abstract description 14
• 238000010168 coupling process Methods 0.000 claims abstract description 14
• 238000005859 coupling reaction Methods 0.000 claims abstract description 14
• 239000002184 metal Substances 0.000 abstract description 6
• 210000001847 Jaw Anatomy 0.000 description 18
• 210000001503 Joints Anatomy 0.000 description 2
• 229910000831 Steel Inorganic materials 0.000 description 2
• 230000000694 effects Effects 0.000 description 2
• 239000000463 material Substances 0.000 description 2
• 230000004048 modification Effects 0.000 description 2
• 238000006011 modification reaction Methods 0.000 description 2
• 239000010959 steel Substances 0.000 description 2

Images

Classifications

• B — PERFORMING OPERATIONS; TRANSPORTING
• B25 — HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
• B25G — HANDLES FOR HAND IMPLEMENTS
• B25G1/00 — Handle constructions
• B25G1/04 — Handle constructions telescopic; extensible; sectional
• B25G1/043 — Handle constructions telescopic; extensible; sectional for screwdrivers, wrenches or spanners

Abstract

A tool for temporarily coupling to a flat wrench that permits applying torque to the flat wrench in positions or locations which render the flat wrench otherwise inaccessible. In one embodiment of the invention, a flat rectangular metal bar is provided with two studs or headed posts on one side thereof and a socket drive fitting on the other side of the bar for accepting conventional socket wrench extension bars, drive handles and the like. In use, the flat wrench is placed on the nut or bolt and the tool placed over the handle of the wrench so as to permit the headed posts to engage the handle when torque is applied to the bar. A socket wrench extension bar is connected to the socket drive fitting and used in conjunction with a drive handle to produce torque on the flat wrench thereby driving the nut or bolt.

Description

The present invention relates generally to an extender tool for flat, fixed-end wrenches of the box and open end type, and more specifically to an extender tool that will permit use of conventional socket wrench extension bars, drive handles, and the like to utilize such fixed-end wrenches in otherwise inaccessible locations.

Flat wrenches are available to the mechanic in a variety of sizes and designs, including fixed and adjustable open-end jaws, box ends, and jointed, universal jaws. These wrenches are usable only when there is sufficient space around the nut or bolt to be turned that the mechanic can grasp the wrench and exert the necessary turning force to its handle. However, it is often desirable to use such wrenches in very restricted locations in which there is insufficient space for socket-type wrenches, and in which the mechanic can not apply sufficient force to the wrench.

Several prior art inventions have disclosed various extension handles for flat wrenches; however most of these simply extend the length of wrench to provide additional leverage and imply sufficient space for operation. For example, Morgan, U.S. Pat. No. 1,643,027 teaches a straight extension handle with a rather complex hook arrangement to engage the handle and the unused opened jaw of a flat wrench. This device is limited to increasing leverage only and is of little use when attempting to use the flat wrench in close quarters. U.S. Pat. No. 2,490,739 to Nesbitt discloses in one embodiment an extension handle having a small offset feature which could permit use in restricted areas. However, the wrench-contacting member is large compared with the wrench size and is fabricated from sheet metal thereby limiting the strength of the device. Further, the patent teaches only an extension handle and does not speak to the problem of manipulation of the wrench in restricted areas. Thus, the known prior art pertaining to flat wrench extension devices involves increasing leverage, and does not approach the problem of using such wrenches in confined locations.

My invention is a simple, small, rugged, and low-cost tool that couples standard socket wrench extension bars, drive handles, and the like to flat wrenches for the primary purpose of using such wrenches in an otherwise inaccessible region. The tool also can provide additional leverage to flat wrenches. A short, flat, rectangular bar is provided with a headed post attached at each end of one face, and a female square-drive socket fitting disposed on the other face. In use, the tool is placed on the handle of the flat wrench adjacent the unused jaw with the two posts straddling the handle. A square-drive socket extension bar is inserted into the female socket of the tool, and a drive handle attached to the outer end of the extension bar. Force applied to the drive handle causes the tool to rotate slightly until the posts firmly contact the edges of the flat wrench handle. Thereafter, the torque is transferred to the nut or bolt, allowing the nut or bolt to be driven even though it is in an otherwise difficult to reach position.

As may now be recognized, my flat wrench extender tool can be coupled to a flat wrench even in areas in which there is very little space in the plane of the flat wrench. The wide variety of conventional socket wrench extension bars, drive handles, and the like can be used in conjunction with my novel extender tool thereby providing the mechanic with considerable added convenience and capability when working in close quarters. The tool is quickly attached and detached from a flat wrench, yet is firmly and safely held in contact with the wrench in use. One size of my extender tool is usable with a wide range of sizes and varieties of flat-type wrenches and can be manufactured and sold at low cost.

It is therefore a principal object of my invention to provide a simple, rugged, low-cost tool for coupling a socket wrench-type drive handle to a flat wrench to permit use of the flat wrench in an otherwise inaccessible area.

It is another object of my invention to provide a flat wrench extender tool that will permit use of a socket wrench-type drive handle to increase the leverage of a flat wrench.

It is still another object of my invention to provide a flat wrench extender tool that can be used with a wide variety of socket wrench accessories tools, such as extension bars, ratchet handles, universal joints, speed handles, and the like.

It is yet another object of my invention to provide a flat wrench extender tool usable with a wide range of sizes of flat wrenches, and that can be produced in various sizes.

It is a further object of my invention to provide a flat wrench extender tool that is quickly and easily attached to and removed from a flat wrench.

It is still a further object of my invention to provide a flat-wrench extender tool usable with open-end wrenches, box wrenches, adjustable open-end wrenches, and the like.

It is still a further object of my invention to provide a flat-wrench extender tool that is small and therefore will not significantly interfere with the movement of a flat wrench.

These and other objects and advantages of my invention will become apparent from the detailed description herein below read in conjunction with the several drawings.

FIG. 1 is a top view of my flat-wrench extender tool shown in position on a broken-line view of a wrench to tighten a nut,

FIG. 3 is a perspective view of the flat wrench extender tool of FIG. 1 in use to loosen a nut in a restricted space of a machine shown in broken-line view,

FIG. 4-B is the extender tool of FIG. 4-A being driven by an extension bar showing locking action of the tool,

FIG. 6 is an alternative embodiment of my invention primarily useful to provide additional leverage to a flat wrench, and

FIG. 7 is a top view of the tool of FIG. 6 in use with a flat wrench showing in dashed line a second operative position.

FIG. 1 and FIG. 2 show a top view and a side view of the preferred embodiment of my flat wrench extender tool 5. The tool 5 consists of a body section 10 which may be formed from a rectangular bar of steel stock; a socket drive fitting 12 welded at right angles to one face of body 10, and adjacent to one end thereof; and a pair of essentially cylindrical posts 14 projecting at right angles from the other face of body 10, with one post at each end thereof. Posts 14 have essentially enlarged concentric circular heads 16 as seen in the figures. Open- end wrench 20 shown in phantom view in FIGS. 1 and 2 is in position to tighten a nut. Posts 14 contact the edges of wrench handle 24 and heads 16 overlap handle 24 to prevent tools from slipping from the wrench when torque is applied.

Socket drive fitting 12 includes square- drive recess 18 selected to fit standard drive devices used with socket wrench sockets. As is well known, such drive sizes include one-fourth inch, three-eighth inch, and one-half inch for small and medium size sockets. The size of my tool 5 is selected as appropriate for the particular size group of flat wrenches with which it is to be used, and the size of square socket recess 18 is selected accordingly. For any size of recess 18, adapters are available to permit use of other size accessories.

An exemplary version of my extender tool useful with flat wrenches having jaw openings in the range of 1/4 inch to 11/2 inch has the following dimensions:

My flat wrench extender tool 5 has the principal function of permitting a torque to be applied to a flat wrench, such as an open end wrench with fixed or adjustable jaw, a box end wrench, or a universal jaw wrench, when the wrench must be used in closely confined regions. In such instances, the user usually cannot apply sufficient force directly to the wrench handle to produce the needed torque. The manner in which my tool 5 solves this problem is illustrated in the perspective view of FIG. 3. Nut 42 is on stud 44 in a machine 40 shown in phantom view and is seen to be in such close quarters that the mechanic can not manipulate open end wrench 30 in normal fashion.

Assume for illustrative purposes that it is desired to loosen nut 42. Extender tool 5 is placed on handle 34 of wrench 30 as close as possible to unused jaw 36 with jaw 32 engaged with nut 42. A conventional socket wrench extension bar 56 of sufficient length to clear interferring portions of machine 40 is inserted into socket fitting 12. A flexhandle 50 is used to drive extension bar 56 in this example, although it is understood that, advantageously, other types of drive handles such as T-bar, ratchet and speed handles may be used. Force applied to the end of handle 50 in the direction of the arrow A, causes tool 5 to rotate slightly in direction B. This action causes posts 14 to contact the edges of flat wrench handle 34. This action is more clearly shown in FIG. 4. In FIG. 4-A, tool 5 is shown placed over flat wrench handle 34, seen in cross section, and in FIG. 4-B the effect of applying torque by means of extension bar 56 is shown. Posts 14 contact wrench handle 34 at points C and D, with heads 16 acting to hook over handle 34. As may be understood, heads 16 thus effectively prevent extender tool 5 from being disengaged from wrench handle 34 as long as the torque is maintained.

The torque on wrench 30 produced by the force on drive handle 50 in FIG. 3 causes nut 42 to be loosened. When flat wrench 30 is thus turned to its limit, tool 5 is removed, wrench 30 turned over, tool 5 installed, and nut 42 loosened further in a conventional off-set wrench operation.

To tighten nut 42 in the example of FIG. 3, my extender tool is placed over handle 34 with posts 14 on opposite sides of handle 34 from the illustration. When torque is applied as previously described but in the opposite direction, posts 14 contact the opposite edge of handle 34 thereby causing nut 42 to be tightened.

It is to be understood that extension bar 56 and flex handle 50 are not to be considered to be part of my invention. As will be obvious to one skilled in the art, a variety of conventional socket drive devices and accessories may be advantageously used in conjunction with my novel flat wrench extender tool.

As previously discussed, socket drive fitting 12 may be a standard square drive 18 as shown in FIG. 1. It is obvious that an 8- point socket 19 as shown in FIG. 5 can be used in fitting 12. This design, formed by two square drives displaced by 45°, provides additional flexibility in selecting the desired angle of the drive handle with respect to the flat wrench handle.

In many applications of flat wrenches, the user may have sufficient space but the length of the wrench may be too short and the user unable to exert sufficient torque. My extender tool is useful in such applications to provide additional leverage to the flat wrench. A socket drive handle, such as the flexhandle 50 of FIG. 3, can be connected directly to socket fitting 12 without the use of an extension bar 56. Thus, additional leverage can be applied to the flat wrench with the handle 50 being an essentially planar extension rather than the angular extension as previously described. However, an even more convenient leverage extender is provided by an alternative embodiment of my extender tool shown in FIG. 6.

Leverage extender tool 60 consists of a flat metal bar having a dog-leg shape with a short head end 63 and a long handle end 62 having an angle of approximately 150 degrees between the short end and long end. Two cylindrical posts 64 are mounted on one face of short end 63 in a similar fashion to posts 14 of the preferred embodiment. Concentric circular heads 66 are attached to posts 64. Long end 62 may be knurled to act as a handle as shown. The size of tool 60 may be selected for the range of flat wrenches to be extended. A typical set of dimensions for use with medium size wrenches is as follows:

Leverage extender tool 60 may be coupled to a flat wrench with posts 64 projecting either upward or downward. As illustrated in FIG. 7, tool handle 62 is grasped in the hand and the flat wrench handle 72 of wrench 70 is engaged by posts 64. Force exerted in direction of the arrow causes torque to be generated on wrench 70 thereby tending to tighten bolt 80. With posts 64 projecting into the plane of the paper as shown in FIG. 7, extender tool 60 forms an angular extension with an angle of about 45 degrees. By inverting tool 60 such that the posts 64 project out of the plane of the paper, as indicated by the dashed lines, the tool 60 forms an essentially straight extension of flat wrench 70. This flexibility, coupled with angle-jawed flat wrenches, allows movement of the flat wrench even with restricted lateral space.

As may now be seen, I have provided simple, low-cost, flat wrench extender tools that permit the mechanic to greatly extend the usefulness of his flat wrenches, and to make use of a number of his socket wrench drive devices to assist in use of flat wrenches in locations otherwise not possible. Although I have described certain specific embodiments, it will be obvious to those skilled in the art that various modifications in design and materials can be made without departing from the scope or spirit of my invention.

Claims ( 3 )

a short bar having post-like projections disposed at each end of one side thereof, said projections being essentially in parallel, spaced relationship to each other, each of said projections consisting of a body portion and an enlarged head portion, said head portions also being spaced from each other; and

coupling means on the opposite side of said bar for coupling said bar to a socket wrench driving device;

whereby said bar is arranged to allow coupling to the handle of the flat wrench by engaging the handle with said projections and applying torque to said bar via said coupling means so as to cause said head portions to hook over the handle thereby effectively preventing said tool from becoming disengaged from the wrench handle as long as such torque is maintained.

A tool as defined in Claim 1 in which said coupling means is a socket drive fitting having a recess, said recess is of square shape thereby adapting said recess to engage a square socket drive device.

Priority Applications (1)

Application Number Priority Date Filing Date Title

US05/720,757 US4104935A ( en )	1976-09-07	1976-09-07	Flat wrench extender tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title

US05/720,757 US4104935A ( en )	1976-09-07	1976-09-07	Flat wrench extender tool

Family Applications (1)

Application Number Title Priority Date Filing Date

US05/720,757 Expired. Lifetime US4104935A ( en )	1976-09-07	1976-09-07	Flat wrench extender tool

Cited By (20)

Cited by examiner, † Cited by third party

Publication number Priority date Publication date Assignee Title

US4315339A ( en )	1980-01-14	1982-02-16	Lightner Theodore P	Combination lawn mower tool
USRE31520E ( en )	1980-01-14	1984-02-14	Combination lawn mower tool
US4457033A ( en )	1982-10-21	1984-07-03	Lightner Theodore P	Adjustable combination lawn mower tool
US4625353A ( en )	1985-07-15	1986-12-02	Carlos Tamez	Brake adjustment tool
US4811638A ( en )	1988-04-25	1989-03-14	Ernst Kertzscher	Torque tools
US4819523A ( en )	1987-04-27	1989-04-11	Souza Alejandro Y	Lug nut wrench
US4960014A ( en )	1989-09-19	1990-10-02	Kelley Roy C	Extension handle for wrenches
US5832794A ( en )	1997-04-08	1998-11-10	Fowler; Elbert J.	Extension handle apparatus for wrenches
US6267030B1 ( en )	2000-01-07	2001-07-31	Daniel H. Rodoni	Tool coupler and extender mechanism
US6308596B1 ( en )	1998-07-15	2001-10-30	Elden Williams	Hand wrench torque enhancing device
US6626069B1 ( en )	2002-04-25	2003-09-30	Donald W. Cooper	Leverage adapter for use in combination with an elongated hand tool
US20040025649A1 ( en )	2002-08-06	2004-02-12	Rugee Frederick P.	Wrench extension
US20040055428A1 ( en )	2002-04-25	2004-03-25	Cooper Donald W.	Leverage adapter for use in combination with an elongated hand tool
US20060156870A1 ( en )	2003-07-09	2006-07-20	Claude Vachon	Wrench extension bar with adapter
US20070006689A1 ( en )	2005-07-11	2007-01-11	Carlson Helmer A	Offset crank speed wrench with lever arm
US7299723B1 ( en )	2005-01-11	2007-11-27	Wessel Iv Homer A	Connectors for a wrench assembly
US8302511B1 ( en )	2008-10-14	2012-11-06	James Adams	Leverage tool
US20160318170A1 ( en )	2014-03-04	2016-11-03	Maxx Leverage	Extension Wrench
US20180065241A1 ( en )	2014-03-04	2018-03-08	Gerald Shane Mulligan	Open End Wrench Attachment Device
CN113681495A ( en )	2021-09-06	2021-11-23	中国化学工程第三建设有限公司	Tightening device, manufacturing method and tightening method for fixed-torque bolt in narrow space

Patent Citations (8)

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Publication number Priority date Publication date Assignee Title

DE308164C ( en )
GB268216A ( en )	1926-09-06	1927-03-31	Charles Henry Bennett	A tool for use in conjunction with a spanner
GB470487A ( en )	1935-12-10	1937-08-13	Michael Bernard Mcgrath	Improvements in and relating to spanners and spanner levers
US2605665A ( en )	1949-08-10	1952-08-05	Motor Adapter Corp	Tool adapted for use as a wrench or as auxiliary handle for other wrenches and tools
US2725773A ( en )	1954-09-27	1955-12-06	Boeing Co	Arcuate wrench-shank slidably engaged by chordal extensionhandle
US3039339A ( en )	1960-04-08	1962-06-19	Harris G Hanson	Handle with selectively usable wrench heads attaching units
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US3376768A ( en )	1967-04-13	1968-04-09	Louis F. Fortunato	Linkage bar for wrenches

Cited By (22)

Cited by examiner, † Cited by third party

Publication number Priority date Publication date Assignee Title

US4315339A ( en )	1980-01-14	1982-02-16	Lightner Theodore P	Combination lawn mower tool
USRE31520E ( en )	1980-01-14	1984-02-14	Combination lawn mower tool
US4457033A ( en )	1982-10-21	1984-07-03	Lightner Theodore P	Adjustable combination lawn mower tool
US4625353A ( en )	1985-07-15	1986-12-02	Carlos Tamez	Brake adjustment tool
US4819523A ( en )	1987-04-27	1989-04-11	Souza Alejandro Y	Lug nut wrench
US4811638A ( en )	1988-04-25	1989-03-14	Ernst Kertzscher	Torque tools
US4960014A ( en )	1989-09-19	1990-10-02	Kelley Roy C	Extension handle for wrenches
US5832794A ( en )	1997-04-08	1998-11-10	Fowler; Elbert J.	Extension handle apparatus for wrenches
US6308596B1 ( en )	1998-07-15	2001-10-30	Elden Williams	Hand wrench torque enhancing device
US6267030B1 ( en )	2000-01-07	2001-07-31	Daniel H. Rodoni	Tool coupler and extender mechanism
US6626069B1 ( en )	2002-04-25	2003-09-30	Donald W. Cooper	Leverage adapter for use in combination with an elongated hand tool
US20040055428A1 ( en )	2002-04-25	2004-03-25	Cooper Donald W.	Leverage adapter for use in combination with an elongated hand tool
US6845692B2 ( en )	2002-04-25	2005-01-25	Donald W. Cooper	Leverage adapter for use in combination with an elongated hand tool
US20040025649A1 ( en )	2002-08-06	2004-02-12	Rugee Frederick P.	Wrench extension
US20060156870A1 ( en )	2003-07-09	2006-07-20	Claude Vachon	Wrench extension bar with adapter
US7299723B1 ( en )	2005-01-11	2007-11-27	Wessel Iv Homer A	Connectors for a wrench assembly
US20070006689A1 ( en )	2005-07-11	2007-01-11	Carlson Helmer A	Offset crank speed wrench with lever arm
US8302511B1 ( en )	2008-10-14	2012-11-06	James Adams	Leverage tool
US20160318170A1 ( en )	2014-03-04	2016-11-03	Maxx Leverage	Extension Wrench
US20180065241A1 ( en )	2014-03-04	2018-03-08	Gerald Shane Mulligan	Open End Wrench Attachment Device
US11034013B2 ( en )	2014-03-04	2021-06-15	Gerald Shane Mulligan	Open end wrench attachment device
CN113681495A ( en )	2021-09-06	2021-11-23	中国化学工程第三建设有限公司	Tightening device, manufacturing method and tightening method for fixed-torque bolt in narrow space

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LUBA AWD 5000 can mow the steep slope up to 75% (37°), and handle the complex lawns and thick tall grass.

In-APP Adjustable Blade Height

LUBA AWD’s double cutting plate with a 400mm(16 inch) cutting width allows it to cut your grass without missing any areas.

LUBA AWD 5000 is ideal for all types of lawns up to 5000㎡(1.25acres). It has a super high efficiency of mowing up to 500㎡(0.13acre) each hour, allowing your family to spend more time enjoying the picture-perfect grass.

Smart App Control Anywhere

With the Mammotion App, lawn care has never been easier.You can customize mowing tasks, and track real-time mowing status anywhere, anytime. Enjoy your vacation and Luba will take good care of your lawn.

Efficient Multi-Zone Management

With the Mammotion App, You can easily set up mowing tasks for multiple working areas, and create channels between them. Set different schedules, cutting modes and cutting heights for each mowing zone.

Planned Route Modes

Compared to the random mowing pattern of conventional robotic mowers, the planned route algorithm significantly improves Luba’s mowing efficiency. You can have it mow one direction then the other, or define angles to mow.

Smart Obstacle Avoidance

Four ultrasonic radar sensors allow the LUBA to automatically detect and avoid obstacles as small as 5cm (2 inches) with a Field of view (FOV) of 220 degrees.

Powerful Battery Auto-recharge

Luba lithium-ion battery has enough capacity to enable Luba to run 180 minutes and to mow up to 500㎡ (0.13 acre) per hour in a session. When the battery is low, it automatically returns to the charging dock, then continues the interrupted mowing session.

Easily Create No-go Zones

You can create no-go zones for plant beds or children’s playgrounds or pools in App, Luba AWD will automatically avoid them.

Automatic Rain Detection

Tiny sensors atop the Luba robot can detect when rain begins and will automatically send the mower back to the charging station.

Anti-theft System

The app will sound an alarm to notify users when there is unusual movement. Luba supports the lost feature. The original user will be informed of the current position of the lost LUBA when it reconnects to the network. LUBA cannot be used by others if the original user has not granted permission.

TüV Rheinland-certified Quality

The LUBA AWD Series robot lawn mower is committed to providing high-quality performance with TüV Rheinland-certified quality. LUBA provides a quiet mowing experience (60dB) and emissions-free lifestyle.

What Our Users Say

Luba does incredibly well on what is quite a difficult terrain. It is amazingly well built and as you can see, even manages to produce stripes.

I was really amazed at how he can mow really tall grass. Tried with a 700 m2 map, the result was outstanding.

I am super impressed so far! My rideon mower would have gotten stuck! Hats off to the Mammotion team! Great product.

Here LUBA is running on a hill where the slope varies between 15 and 35 degree.

It is doing a surprisingly great job. It cut the whole front lawn today with no interventions. It has every potential to be the leading fully automated lawnmower.

The 4 motors on every wheel have proven super useful. In my first trial, the machine hasn’t had any failures and the GPS position seems to be very accurate, even near the house.

Tech-art Aesthetics and Robust Safety

Mowing in another direction when encountering hard objects.

Stop spinning blades when Luba is lifted or unbalanced.

Smart obstacle avoidance with 220°FOV

Ensure Luba AWD easy clean with sprinklers and has absolute durability in all-weather

• Charging Station
• LUBA AWD 5000
• Power Supply
• RTK Reference Station
• RTK Reference Station Extension Cable(10m)
• RTK Reference Station Power Supply
• Extra One Set Of Blade
• Key
• Installation Kits
• Mounting Pole
• Quick Start Guide

FREQUENTLY ASKED QUESTIONS

If the product does not work as guaranteed during the warranty period, you can request after-sales service by contacting the upcoming local MAMMOTION distributor or email us at support@mammotion.com. The main parts of the lawn mower and battery are covered under a 2-year warranty. Please note that the accessories (Charging Station and RTK Antenna) are under a 1-year warranty while blades and tires do no have warranty. The warranty period for a product is valid on the day when product(s) are delivered from local warehouse for Kickstarter backers’ orders and pre-orders, while the other orders is valid on the purchase date.

• With a perimeter wire, firstly, someone has to install it – this means extra time if you do it yourself, or extra cost if someone else does it. Secondly, the perimeter wire can be damaged by animals or someone putting a spade through it. a break in the perimeter wire can be frustrating.Thirdly, if you want to change the area to be mowed, it means re-laying the wire. Finally, if you decide to move, you need to re-laying again the wire in your new lawn.
• With Luba, forget all the above worries. You just walk with Luba along to draw vitrual bounderies, you can program your multi-cutting zones without the hassle of digging or burying the wires.
• With Mammotion APP, you can remotely preset and update the mowing parameters for each zone, as well as check Luba’s status in real-time. The APP can be used remotely to manage your lawn when you are on a vacation or business trip.
• Luba robotic lawn mower keeps your lawn carpet-like all the time. Luba cuts more frequently in 1-2cm to ensure your grass stay healthy.
• It is quiet, you can run it at any time without worrying about disturbing your daily activity or your neighbours.

Thanks to the RTK-GNSS System, users can easily create and set mowing tasks for separated mowing areas in the Smart app. as well as set channels to connect them for multi-zone management. By setting up the operation parameters of different tasks, the equipment can automatically operate in multiple areas in sequence. Luba can pass the sidewalk when the width is more than 1 meter and surroundings are not severely blocked.

RTK base station does not need to be connected to the charging station. You can put the charging station anywhere you want! If you want to install RTK station on the roof, you will need to have a separate power adapter and extension cord to power RTK reference station.

Does the entire area needs to require Wi-Fi signal or once it gets its command near its charging base it can go complete work and then come back to charge ?

Once the mission is set it get do the whole workflow itself even without Wi-Fi. The Wi-Fi is to help you check the status of LUBA and receive messages remotely on your cell phone.

Fixing a free lawn mower for cheap, fixing the safety bail bar handle. MTD Yard Machines Craftsman

You can easily perform the installation yourself. A quick start guide will be included in the box. installation course video will comes.

Luba can manage multiple zones,if there is a path between these two yards, Luba can travel to the second yard and do the work automatically.

With Mammotion App, you can remotely preset and update the mowing parameters for each zone, as well as check Luba’s status in real-time.

The Best Extension Cords for Your Home and Garage

We’ve updated this guide and we remain confident in our picks. Our favorite is the Southwire 1638SW0061 Polar/Solar Supreme Extension Cord.

If you’ve always just bought whichever extension cord happens to be sitting on the shelf at your local hardware store, you’re missing out on cords that are safer, more durable, and more flexible than the ones most commonly available at brick-and-mortar retailers, and they’re much easier to use in cold weather. After spending more than 45 hours researching over 65 different extension cords, talking with two safety experts, and testing 12 of the most promising for flexibility—some even in zero-degree temps—we recommend the U.S. Wire Cable 50 FT. Extreme All-Weather Extension Cord. For a more stylish indoor option, we like the Cordinate Décor Extension Cord with 3 Grounded Outlets.

The best extension cord

With a solid power rating and durable construction, this cord can safely handle any job around a home or garage. Plus, it’s the most flexible cord we’ve tested, even in freezing temps.

Buying Options

At the time of publishing, the price was 75.

The U.S. Wire Cable 50 FT. Extreme All-Weather Extension Cord offers an excellent combination of functionality and usability. The thick, 12-gauge wires inside are rated to handle up to 15 amps—as much as most residential breakers will allow—making it safe to use with most tools and equipment. It’s also the most flexible cord we’ve ever used, so it’s as easy to work with in the height of summer heat as it is the depths of a near-zero-degree winter. The outlet end has a small LED that lights up when the cord is live. If you’re going to own only one extension cord, the 50-foot version is versatile enough to maneuver across a two-car garage, run between two rooms indoors, or stretch deep into a yard or driveway. We’ve seen it priced anywhere between 50 and 90, which may induce some serious sticker shock, but it’s a reasonable price for a high-quality extension cord that can survive even the harshest conditions and has a lifetime warranty.

Slightly stiffer

The Southwire cord is nearly identical to our top pick, but it’s just a little stiffer and typically costs a bit more.

Buying Options

At the time of publishing, the price was 60.

If the U.S. Wire Cable isn’t available, we also like the Southwire 1638SW0061 Polar/Solar Supreme Extension Cord. It has all the same characteristics of our top pick but is a little stiffer, making it just a tad trickier to coil up at the end of the day.

A whisker stiffer

Like the Southwire, the Clear Power cord is nearly identical to our pick but has a little locking switch at the plug end to secure the connection. It’s an okay feature, but not an essential one.

Buying Options

At the time of publishing, the price was 57.

Another very similar option is the Clear Power CP10091 50 ft TPE Rubber Heavy Duty Extension Cord, which proved easy to handle. It’s a little stiffer than our main pick but otherwise offers the same powering capabilities, and it has a locking switch at the plug end that prevents whatever you’re plugging into it from disconnecting accidentally. It’s a decent feature, but we have suspicions about the mechanism’s long-term durability. Also, there are enough other ways to secure the plugged connection of an extension cord that we don’t think this is necessary.

Not as flexible in cold weather

The Iron Forge cord doesn’t cost as much as our other picks, but it’s not as easy to coil. It can carry the same amount of power, though.

Buying Options

At the time of publishing, the price was 45.

If you live in a warmer climate and don’t need a cord that’s flexible through the cold depths of winter, we also like the Iron Forge Tools 12/3 SJTW Heavy Duty Yellow Outdoor Extension Cord. It has the same power rating as our other picks, but the cable sheath is made of a different material (the kind most hardware store cords are made of), so it’s stiffer in general and won’t be as loose in colder temperatures. In our testing it sat flat on the ground, but it’s harder to spool than our other picks.

A cord for low-power, indoor use

Unlike many of its competitors, the Cordinate indoor cord has a sleek look and a flat plug that won’t get bent or pulled from an outlet. We love that it’s available in a multitude of colors, especially neutrals.

Buying Options

If you need an indoor cord just to plug in a lamp or phone charger, the 10-foot Cordinate Décor Extension Cord with 3 Grounded Outlets is the best choice. Unlike many inexpensive cords for indoor use, the Cordinate has a third prong for grounding, which provides extra protection against electrical shorts and shocks. Plus, it has a flat plug that’s less likely to be bumped out of the socket by furniture, pets, or people; half-plugged cords and damaged wiring can increase the risk of fire. Some other indoor cords share these characteristics, but what really sets the Cordinate apart is that it’s available in a wide array of colors. Cords like these aren’t meant to be used outdoors or with high-power tools and equipment—they’re intended only for low-power use around the home or office.

All of the picks in this guide are available primarily from online retailers; the best extension cords are rarely found on shelves at big-box hardware stores. But if you need a cord right now, we do have tips for how to pick the best extension cord at your local hardware store.

Why you should trust us

For this guide, we spoke with John Drengenberg, consumer safety director at Underwriters Laboratories (UL), an independent consumer safety organization. Drengenberg has been with UL for more than 50 years, over which time he earned the nickname “Mr. Safety.” We also consulted with Jeff Lutke, principal engineer of UL’s Wire Cable division.

Former Wirecutter senior editor Mark Smirniotis, the original author of this guide, covered electrical and charging products for three years as a staff writer at Wirecutter, writing about everything from rechargeable batteries to surge protectors to generators. During that time, he frequently consulted with electrical engineers and safety organizations like UL.

Senior staff writer Doug Mahoney spent 10 years in high-end home construction as a carpenter, foreman, and jobsite supervisor in the Boston area. He was also on the safety committee of the company he worked for, which included the maintenance of safe jobsites (including proper extension cord usage), and has been reviewing tools and gear since 2007. Between these two roles, Doug has used and evaluated extension cords for at least the past 20 years.

Who this is for

High-end outdoor extension cords are not cheap, but they’re durable, safe, and far easier to use than the generic orange cords you’ll find tangled in garages nationwide. Our picks are noticeably better, whether you’re plugging in an extra fan in the summer, inflating a tire, or powering a wireless speaker for a party. And if you’re planning on doing any home-improvement or maintenance projects, the cords we recommend are properly sized and rated for as much power as a home outlet can produce, making them compatible with larger tools such as portable table saws and air compressors.

In addition to heavy-duty and outdoor cords, we also considered indoor extension cords for all the other light-duty needs that come up in everyday life. Just like their beefier siblings, these cords may seem similar on the shelf, but small differences can make for a safer cord that looks better when you need it to charge a phone on your power-starved nightstand or plug in a lamp on that one table that’s nowhere near a wall outlet.

How we picked

A good extension cord should have a 15-amp power rating and 12-gauge wires, and be tested and approved by a third party—either UL or Intertek. It should have an elastomer sheath that makes it flexible enough to consistently lay flat on the ground and easy to coil up. We also prefer models with lighted ends, which make it easy to see whether power is running through the cord. Extension cords come in various lengths, but we think 50 feet is the most practical for all-around use because it’s long enough to reach the lawn, but not so long that it’s heavy and difficult to coil up.

6 And 10 Minutes Will Give Your Riding Mower 1 Finger Steering

Here’s more information about the features we looked for in an extension cord—and why they’re important.

Third-party approved, SJEOW rated: Any cord marked by UL (“UL Listed”) or Intertek (“ETL Listed”) has been tested to certain safety and function standards by a reputable third party. This ensures that the cord is of reliable quality and can be used safely within its given power rating. The specifics of this testing are held in a seemingly random string of letters printed on the side of the cord. Through our research, we found that the best cords for home use are designated as SJEOW and SJEOOW.

Every letter in these codes has a meaning (PDF), and by understanding them, it’s easier to know the differences between our preferred SJEOW and SJEOOW cords and the more commonly found, less-expensive SJTW cords, which populate the shelves of big-box stores. The most important of these letters, for our purposes, is the “E.” This indicates that the sheath of the extension cord is made of an elastomer and not a thermoplastic, which is what the “T” in SJTW stands for. (Not to confuse matters further, but we should note that some elastomers are a form of thermoplastic.) The only difference between SJEOW cords and SJEOW cords is that the latter’s outer sheath and inner-wire covers are both oil resistant; with the former, only the outer sheath is oil resistant.

Elastomer sheaths are preferable because they are very rubbery and flaccid. In our tests, they barely held any shape memory and consistently sat flat against the ground when unrolled, which greatly reduces any tripping hazard. Coiling them in at the end of the day is also much easier, as they fall naturally into even loops. Elastomer cords perform much better in extreme temperatures, too. For example, our top pick, an SJEOOW cord, has been approved for use in temperatures ranging from 221 degrees Fahrenheit to.94 degrees Fahrenheit, while the SJTW cords we looked at are typically approved to temperatures from 140 °F to.40 °F.

These temperature numbers on the SJTW cords may sound impressive, but Jeff Lutke, principal engineer of UL’s Wire Cable division, explained that these numbers only indicate that the cord can be wrapped around a test spool without cracking or breaking. It does not indicate the temperature at which the cord starts to become stiff. What these numbers do indicate, and what we saw in our testing, is that the elastomer coating on SJEOW and SJEOOW cords has a much higher resilience to temperatures than the thermoplastic-insulated SJTW cords. This difference is manifested in their general handling at any temperature.

A 50-foot, 12-gauge wire: How much power a cord can carry is related to the wire’s thickness and the length of the cord. The longer the cord, the thicker the inside wires need to be to handle the same amount of power. For home use, a 50-foot extension cord with a 12-gauge wire thickness offers the best in portability and power.

A 12-gauge, 50-foot wire can handle 15 amps, which matches most residential breakers and many older fuses. These breakers prevent overloaded circuits by cutting the power if you try to draw more than 15 A. If you’re using a cord rated for only 10 A or 12 A, as many cheaper ones are, your breakers won’t help you avoid an overload if you plug in something with a higher amp rating, with consequences from the unfortunate (a tripped breaker) to the catastrophic (fire). A cord capable of 15 A is more expensive than its light-duty cousins but will satisfy the demands of heavy-duty electric tools like circular saws long after you’ve forgotten its rating. But as a cord gets longer, its amp rating starts to drop. So a cord like our pick, which can handle 15 A at 50 feet, can still power 15 A at 100 feet, but only for short periods of time.

If you use cords that are too thin for the length and power you need, you can run into two problems. The most common is voltage dropping from the outlet to the far end of the cord. This can mess up different types of equipment in a few ways: Lights may dim, saws may not spin as fast, and some motors just won’t work at all. That can cause safety issues of its own (slow saws won’t cut cleanly, which can make them harder to control). The biggest problem with an undersized cord is that it can actually start a fire. Pulling too much power through a too-small cord will cause it to heat up, eventually melting the jacket and exposing the bare wiring underneath.

For indoor cords that won’t be subjected to much more than phone chargers, lamps, or small speakers, a 15 A power rating isn’t as important. Even if all three of those items were plugged in, it’s unlikely they’d use more than 7 A. That’s why other features, like flush-mounted plugs and grounding pins that reduce the risk of shocks or fire, are more important for indoor cords.

A lighted end: We like extension cords that include a small LED light at the plug end to let you know when the cord is powered. If your cord is plugged in around a corner or otherwise out of sight, it’s nice to know at a glance when the power is on and when it isn’t.

Some cords also include locking brackets or switches to keep a plugged-in tool’s power cord firmly attached to the extension cord’s outlet. It’s a nice-to-have feature, but it often adds bulk to the plug end, making it incompatible with recessed outlets such as those found on electric snow blowers or lawn mowers. Also, extension cords can lead rough lives—they’re frequently stepped on or dropped—so we see these brackets and switches as just another thing that can break. (You’ll still be able to use the cord itself, though.) There are ways of tying two cords together at the connection point to create the same kind of stability, if not more, without these drawbacks. If you feel strongly about having a separate holding bracket, there are many third-party cord locks available.

For indoor cords, we recommend flatter plugs that sit flush to the outlet. That helps prevent the plug from getting pulled out—or worse, partially pulled out—when you move a chair or a pet bumps into it.

How we tested

We considered more than 55 extension cords with UL or Intertek listings from top online retailers. and then narrowed the list based on the power ratings and added features. To decide on our final picks, we tried out six indoor/outdoor cords and three indoor cords, examining each one and using them in a variety of environments to see which cords would survive trouble-free for years to come. In 2021, we tested an additional six options.

The best extension cord

With a solid power rating and durable construction, this cord can safely handle any job around a home or garage. Plus, it’s the most flexible cord we’ve tested, even in freezing temps.

Buying Options

At the time of publishing, the price was 75.

If you buy only one extension cord, we recommend the U.S. Wire Cable 50 FT. Extreme All-Weather Extension Cord. It has thick, 12-gauge wires inside that can handle up to 15 A of electricity, and it was the most flexible and floppy cord of any we tried. We even froze it to nearly 0 ºF for two days, after which we stretched it out flat without a problem and coiled it without kinks. This flexibility makes it safer and easier to use than the others, a fact that becomes most apparent in colder temperatures. The U.S. Wire Cable cord is also oil resistant, making it more durable in more environments (like garages), and the outlet end lights up when power is on. This is not a cheap cord—we’ve seen it priced anywhere between 55 and 90—but its durable construction and lifetime warranty makes it a tool that you can expect to have for the long haul.

Like all of the cords we tested, the U.S. Wire Cable 50 FT. Extreme All-Weather Extension Cord is rated for 15 A, making it hardy enough to handle any tools or equipment powered by a standard household plug, including larger items like compressors and table saws. The 12-gauge wire inside is thick enough to deliver the proper voltage from end to end, and the coating on the entire length of the cord (a jacket made of a rubbery elastomer instead of a plasticky vinyl) is not only weather resistant but also oil resistant. All the cords we tested were rated by UL to withstand UV rays and a bit of rain (marked with a “W” for weather resistance), but since our pick is also oil resistant, it won’t break down when regularly dragged across oil- or grease-covered floors in garages or workshops. That makes it more versatile and more reliable, no matter what projects pop up years down the line.

Stiff cords that loop and twirl across a yard or floor create tripping hazards that can be made exponentially more dangerous if, say, the cord is plugged into a running table saw.

Most extension cords are plenty flexible when heated up in the sun, but SJEOW and SJEOOW cords like the U.S. Wire Cable have elastomer sheaths, which are much more flexible and cold resistant than the thermoplastic sheaths found in SJTW cords (the kind you see in most hardware stores). After two days coiled in a deep freeze at SD Cold Storage, we threw the end of the U.S. Wire Cable cord, and it snaked out without any indication of what it had been through. When we repeated this on the more-common thermoplastic SJTW cords, the worst ones recoiled like a spring, and others kept some of their stiff curves as they reached across the floor. The U.S. Wire Cable cord had a floppiness the others—even the additional SJEOW-listed cords we tested—didn’t.

This looseness means a much safer cord. Stiff cords that loop and twirl across a yard or floor create tripping hazards that can be made exponentially more dangerous if, say, the cord is plugged into a running table saw. The benefits of a floppy cord are also evident when it’s time to stow it away. Because it has so little shape memory, the U.S. Wire Cable cord feeds handily into a nice, even loop, making it easier to unravel the next time you use it. Trying to unsnarl a stiff cord is more akin to untangling a curling rat’s nest of cables.

We really came to appreciate the U.S. Wire Cable cord when we used it throughout a series of New England winters. It was there, on the coldest days, when we really valued what the U.S. Wire Cable cord provides. With multiple cords laid out and in use, strewn across the snowy ground, only the U.S. Wire Cable cord actually sat completely flat. The others retained some of their coil shape and here and there would loop up a couple inches off the ground, creating a serious tripping hazard. At the end of each day, coiling the U.S Wire Cable cord back up went quickly and easily, a contrast to the others which we had a much harder time with.

The U.S. Wire Cable also has an outlet that makes a smooth, firm connection with the power cords you plug into it. Overly tight outlets can make it difficult to get a plug all the way in, resulting in a poor connection and a higher risk of shocks or shorts, especially when exposed to any moisture. That can make it too easy to accidentally pull out a plug while you’re using a tool.

Our pick is 50 feet long, which we think is the best for general use, but the same cord is also available in lengths of 25 feet and 100 feet, if those better suit your needs.

If there is a downside to the U.S. Wire Cable extension cord, it’s the cost: We’ve seen it priced anywhere between 55 and 90. It’s a substantial investment either way, but when compared to high-quality SJEOW and SJEOOW cords, the price isn’t unreasonable—all of them exist in a similar price range. The same can be said for SJTW cords, which can cost up to 80. Speaking as people who have spent decades fighting with and tripping over cheaper cords, we’re confident that the U.S. Wire Cable is considerably better than what you can pick up in a box store, and durable enough to justify the heavy initial investment.

Long-term test notes: Former Wirecutter senior editor Mark Smirniotis has had the U.S. Wire Cable 50 FT. Extreme All-Weather Extension Cord for over three years now, and it continues to be the first cord that he reaches for. Though he hasn’t subjected it to freezing temps since his initial testing, he’s otherwise put it through the paces as best a non-pro can: It powered a table saw through a weekend of fence construction, it was left out in the sun for a couple weeks after powering some string lights for a party, and it’s been coiled and re-coiled many times for smaller tasks like powering shop vacs or work lights. It’s still in great shape. Perhaps most telling: A general contractor working on Mark’s house needed a cord, and Mark offered the U.S. Wire Cable (on pain of death if it wasn’t returned). The owner of the company and the head of the crew both agreed it had the nicest feel of any extension cord they’d encountered—and wanted to know the brand so they could put a couple on their shopping lists.

New Hampshire-based writer Doug Mahoney has been using the cord for over a year on his farm. As a long-time user of box store cords, he has been amazed at how floppy the U.S. Wire Cable cord remained throughout the brutal New England winter.

Why Does My Ryobi Lawn Mower Keep Shutting Off? (Solved)

Ryobi makes some fantastic mowers, and I have reviewed some of them here.

But I have seen one question come up fairly regularly from those who own them.

Why does my Ryobi lawn mower keep shutting off?

It does seem to be a common problem.

Thankfully it is one that can be resolved.

So we take a closer look at the possible reasons for it here.

Why Does My Ryobi Lawn Mower Keep Shutting Off?

The common recurrence of Ryobi mowers suddenly shutting off is usually down to a poor design of the handle affecting a safety switch that stops the mower from working. Often tightening up the bolts connecting the handles to the mower can fix the issue. If your mower is within warranty contact Ryobi who should be able to work with you to resolve the problem.

REASON #1: It is a Problem With the Handle

If you are having issues with your Ryobi mower randomly shutting off without warning, the number one place you want to look to resolve the issue is the handle of your mower.

It seems to be the source of most problems.

If your grass is too long and thick, and you go too long between mows the blade might get stuck on the accumulating grass clippings and stall.

The mower will automatically sense it is being overworked and intentionally stall the mower to prevent the motor from being blown.

Make sure you don’t leave your grass too long between cuts.

Final Thoughts

We’ve covered it in detail here, and on the infographic above, but if you are having problems with your Ryobi mower stalling the most likely cause of it is the handle and the safety switch.

They work in conjunction with each other and have been purposefully designed to ensure you can’t accidentally start your mower without the handle being properly engaged.

Unfortunately, the design ruins what are otherwise very good mowers!

If your mower is still within its warranty get in touch with Ryobi who should sort the problem out for you.

Or simply bear this in mind when you make future purchases, as it is a very frustrating problem to experience.

There are some great lawn mowers on the market these days, so you shouldn’t have to put up with a recurring issue like this.