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US2523385A - Lever and cam operating means for releasing locking pliers from locked position - Google Patents

Lever and cam operating means for releasing locking pliers from locked position Download PDF

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Publication number
US2523385A
US2523385A US64576146A US2523385A US 2523385 A US2523385 A US 2523385A US 64576146 A US64576146 A US 64576146A US 2523385 A US2523385 A US 2523385A
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Prior art keywords
handle
pliers
locking
lever
release
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Expired - Lifetime
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Lawrence C Mead
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Lawrence C Mead
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/12Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears
    • B25B7/123Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears with self-locking toggle levers

Description

Sept. 26, 1950 L. C. MEAD LEVER AND CAM OPERATING MEANS FOR RELEASING LOCKING PLIERS FROM LOCKED POSITION Filed Feb. 6. 1946 INVENTOR. L. C. Mead Patented Sept. 26, 1950 LEVER AND CAM OPERATING MEANS FOR RELEASING LOCKING PLIERS FROM LOCKED POSITION Lawrence C. Mead, Turlock, Calif. I Application February 6, 1946, Serial No. 645,761

1 Claim. 1

This invention relates to, and it is an object to provide, an easily and readily manipulated release for locking pliers wherein the jaws are locked in engagement with the work upon approaching movement of the handles suflicient to cause a locking'device, inthe tool, to pass deadcenter and yieldably lock the handles against separation; pliers of this type being shown in copending application, Serial No. 613,875, filed August 31, 1945, now abandoned.

Another object of the present invention is to provide a release for locking pliers, as above, which is operative by the same hand which holds the pliers; such release including a longitudinally extending lever pivoted on one handle of the pliers and having a leg adapted to engage a part on and to force the other handle away from said one handle upon swinging of said lever, and so as to break the locking device over dead-center in a pliers-opening direction.

A further object of the invention is to provide a practical device, and one which will be exceedingly efiective for the purpose for which it is produced.

These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings:

Figure 1 is a side elevation, partly broken away, showing the position of the release when the pliers are in locked, closed position.

Figure 2 is an elevation showing the position of the release after it has been actuated to unlock the pliers.

Referring now more particularly to the characters of reference on the drawings, the release is here shown as embodied in a pair of locking pliers which include a fixed jaw l and a movable cooperative jaw 2 pivoted in connection therewith, as at 3. The fixed jaw l is formed in integral rigid relation on the forward end of a handle 4, whereas the other handle 5 of the pliers is of relatively reduced length and pivoted to the movable jaw 2, as at 6.

A longitudinally adjustable locking device or link, indicated generally at 1 extends diagonally between the handles 4 and 5, and is pivoted in connection therewith, at opposite ends, as at 8 and 9. The locking device 1 is adjusted in length so that when the jaws l and 2 engage with the work, relative approaching movement of the handles 4 and 5 to a given point will cause the locking device I to pass inwardly beyond deadcenter and to thereafter releasably lock the handles, and consequently the jaws, against separation.

In pliers of this type it has been found difiicult to unlockthe same; i. e. to manually separate the handles 4 and 5 for the purpose of releasing the jaws from the work. The release which comprises the present invention, is provided for the purpose of facilitating the separation of the handles and the breaking of the locking device 1 from a locked position over dead-center to a pliers-release position. The release comprises the following arrangement:

The handles 4 and 5 are of channel configuration, and an elongated lever In is disposed in the handle 5 and. projects out of the rear end thereof, as shown. Substantially opposite the pivot 8 the lever I0 is pivoted in the handle 5, as at II, for swinging movement toward the handle 4. A forwardly projecting stop l2 on the front end of the lever l0 ahead of the pivot H limits the extent to which said lever may swing toward said handle 4.

A laterally projecting leg or cam element I3 is formed on the lever l0 adjacent but mainly to the rear of the pivot l I, and said leg is straightcut, at its outer end as at S, to substantially flatly engage with the shank la locking device 1 closely adjacent the pivot 8 when the pliers are closed and locked. The shank la extends rearwardly of the pivot 8, as at lb, to provide a bearing surface for the straight-cut cam end S; the bearing of said cam end on this extension providing excellent leverage for release of the locking device. Further, as the straight-cut cam end S substantially flatly engages said extension lb, the leverage for release of the locking device 1 is enhanced. A leaf spring I4 between the lever ill and handle 5 normally urges the lever toward the handle 4.

The position of the parts, when the pliers are closed and locked, is shown in Fig. 1. To separate the handles 4 and 5 and release the locking device 5, the operator, with the same hand that manipulates the pliers, grasps handle 4 and the projecting end of lever I0, swinging the latter towards the handle 4. The cam action which results from the laterally projecting leg l3 moving forwardly relative to the pivot I I then causes separation'of the handles 4 and 5, and breaking of the locking device 1 over dead-center in a pliers-release direction. In this manner the pliers are readily and easily opened, and with much greater facility than is possible without the described release.

From the foregoing description it will be readily seen that there has been described such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claim. 7

Having thus described the invention, the following is claimed as new and useful'and upon which Letters Patent are desired:

In locking pliers having longitudinal jaw control handles arranged for relative approaching or separating motion, the handles being of channel shape opening toward each other, a releasable oVer-dead-center locking link extending at a forward diagonal from within one handle to within the other handle, a transverse pivot between each handleand the adjacent end of the locking link, a longitudinal lever disposed in said other handle and projecting out of the rear end thereof, and a transverse pivot between the lever adjacent its forward end and said other handle; a link release device comprising, with said longi tudinal lever, a cam projecting laterally from the lever adjacent its pivot and in the direction of said one handle, said cam engaging the link adjacent the link pivot on said one handle, the link being extended rearwardly of its pivot in said one handle, the outer ,end of the cam being straight-cut and substantially flatly engaging said extension when the pliers are closed, a stop projecting forwardly from the front end of the lever ahead of the pivot for the latter, said stop and adjacent portion of the lever being normally spaced from the bottom of said other handle, and a leaf spring in said space connected between the lever rearwardly of its pivot and extending forwardly to engagement with the bottom of said other handle under the stop.

LAWRENCE C. MEAD.

1 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 557,452 Thompson et a1. Mar. 31, 1896 557,453 Thompson Mar. 31, 1896 952,079 McIntire Mar. 15,1910

1,294,689 Mellum Feb. 18, 1919 1,426,553 Cruickshank Aug. 22,1922 1,568,934 Tull et a1. 1 Jan. 5, 1926 2,462,709 Ball Feb. 2 2, 1949 p FOREIGN PATENTS Number Country Date 576,142 Great Britain Mar. 20, 1946

US2523385A 1946-02-06 1946-02-06 Lever and cam operating means for releasing locking pliers from locked position Expired - Lifetime US2523385A (en)

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US2523385A US2523385A (en) 1946-02-06 1946-02-06 Lever and cam operating means for releasing locking pliers from locked position

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US2523385A US2523385A (en) 1946-02-06 1946-02-06 Lever and cam operating means for releasing locking pliers from locked position

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US2523385A true US2523385A (en) 1950-09-26

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574676A (en) * 1946-11-22 1951-11-13 Glenn J Waterbury Toggle actuated plier-type wrench
US2590750A (en) * 1948-06-01 1952-03-25 Burns Bruce Release means for toggle-actuated wrenches
US2592807A (en) * 1950-01-23 1952-04-15 Harold T Jones Locking wrench and plier
US2598650A (en) * 1948-07-28 1952-05-27 Seymour Smith & Son Inc Snap lock pliers with unlocking lever
US2669145A (en) * 1952-10-03 1954-02-16 Homer A Mead Releasing device for locking pliers
US2749787A (en) * 1951-06-06 1956-06-12 Forges Stephanoises Sa Des Self-locking clamping device
US2799195A (en) * 1954-05-03 1957-07-16 Mole & Son Ltd M Toggle release means for a pivoted jaw wrench
DE1016199B (en) * 1953-04-02 1957-09-19 Gedore Werkzeugfab O Dowidat locking pliers
US2894547A (en) * 1957-05-01 1959-07-14 Lapeer Mfg Company Lever unlocking means in toggle action clamping devices
US2920518A (en) * 1957-09-10 1960-01-12 Pointe Gabriel M La Toggle-joint wrench with cam release means
DE1086189B (en) * 1954-02-24 1960-07-28 Facom Manufacture Francaise De collet
US3262343A (en) * 1964-03-27 1966-07-26 Robert W Weller Toggle wrench having automatic abutment adjusting means
DE1300466B (en) * 1956-06-26 1969-07-31 Hostetter John L collet
FR2237730A1 (en) * 1973-07-20 1975-02-14 Facom
DE10037348A1 (en) * 2000-07-31 2002-02-21 Rodo Ketten Kettenfabrik Gmbh Jointing clamp; has jaw fixed to main shell and second jaw linked to main and counter shells, where jaws have straight sides that fit together with aligned semicircular depressions in each jaw
US6591719B1 (en) 2001-07-19 2003-07-15 Newell Rubbermaid, Inc. Adjustable pliers wrench
US6626070B2 (en) 2001-05-04 2003-09-30 Irwin Industrial Tool Company Compound toggle link retention mechanism
US20060089651A1 (en) * 2004-10-26 2006-04-27 Trudeau Jeffrey L Apparatus and method for anchoring a surgical rod
US7313989B1 (en) 1999-06-11 2008-01-01 Tortolani Jr Kenneth Guy Parallel jaw locking toggle pliers/wrench
US20080154277A1 (en) * 2004-10-26 2008-06-26 Scott Machalk Tool apparatus for locking a spinal rod in an anchoring device therefor
US20080195155A1 (en) * 2007-02-12 2008-08-14 Jeffrey Hoffman Locking instrument for implantable fixation device
US20080228233A1 (en) * 2007-02-12 2008-09-18 Jeffrey Hoffman Instrument for manipulating spinal implant system
US20090157125A1 (en) * 2007-02-14 2009-06-18 Jeffrey Hoffman Spinal Rod Reducer and Cap Insertion Apparatus
US20090228054A1 (en) * 2008-01-29 2009-09-10 Jeffrey Hoffman Rod Locking Instrument
US20110202096A1 (en) * 2010-02-12 2011-08-18 John White Spinal Rod and Screw Securing Apparatus and Method
US20150158151A1 (en) * 2013-11-01 2015-06-11 Curtis Brown Ratchet adjustable locking pliers
US20150266177A1 (en) * 2014-03-21 2015-09-24 Richard Conklin Multi-purpose locking pliers
WO2017134069A1 (en) * 2016-02-04 2017-08-10 Knipex-Werk C. Gustav Putsch Kg Pliers having two pliers handles

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US557452A (en) * 1896-03-31 thompson
US557453A (en) * 1896-03-31 thompson
US952079A (en) * 1908-12-14 1910-03-15 Perfection Wrench Company Wrench.
US1294689A (en) * 1918-06-21 1919-02-18 Ole H Mellum Combination pliers and wrench.
US1426553A (en) * 1921-07-11 1922-08-22 Cruickshank Alexander Pliers
US1568934A (en) * 1924-02-15 1926-01-05 Vera Biedinger Wrench
GB576142A (en) * 1944-03-06 1946-03-20 Edgar Dale Ball Improvements in or relating to toggle actuated hand appliances
US2462709A (en) * 1944-03-06 1949-02-22 Taylor Ball Developments Ltd Toggle actuated tool and release therefor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US557452A (en) * 1896-03-31 thompson
US557453A (en) * 1896-03-31 thompson
US952079A (en) * 1908-12-14 1910-03-15 Perfection Wrench Company Wrench.
US1294689A (en) * 1918-06-21 1919-02-18 Ole H Mellum Combination pliers and wrench.
US1426553A (en) * 1921-07-11 1922-08-22 Cruickshank Alexander Pliers
US1568934A (en) * 1924-02-15 1926-01-05 Vera Biedinger Wrench
GB576142A (en) * 1944-03-06 1946-03-20 Edgar Dale Ball Improvements in or relating to toggle actuated hand appliances
US2462709A (en) * 1944-03-06 1949-02-22 Taylor Ball Developments Ltd Toggle actuated tool and release therefor

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574676A (en) * 1946-11-22 1951-11-13 Glenn J Waterbury Toggle actuated plier-type wrench
US2590750A (en) * 1948-06-01 1952-03-25 Burns Bruce Release means for toggle-actuated wrenches
US2598650A (en) * 1948-07-28 1952-05-27 Seymour Smith & Son Inc Snap lock pliers with unlocking lever
US2592807A (en) * 1950-01-23 1952-04-15 Harold T Jones Locking wrench and plier
US2749787A (en) * 1951-06-06 1956-06-12 Forges Stephanoises Sa Des Self-locking clamping device
US2669145A (en) * 1952-10-03 1954-02-16 Homer A Mead Releasing device for locking pliers
DE1016199B (en) * 1953-04-02 1957-09-19 Gedore Werkzeugfab O Dowidat locking pliers
DE1086189B (en) * 1954-02-24 1960-07-28 Facom Manufacture Francaise De collet
US2799195A (en) * 1954-05-03 1957-07-16 Mole & Son Ltd M Toggle release means for a pivoted jaw wrench
DE1093746B (en) * 1954-05-03 1960-11-24 Mole And Son Ltd M designed as a collet Maulschluessel
DE1300466B (en) * 1956-06-26 1969-07-31 Hostetter John L collet
US2894547A (en) * 1957-05-01 1959-07-14 Lapeer Mfg Company Lever unlocking means in toggle action clamping devices
US2920518A (en) * 1957-09-10 1960-01-12 Pointe Gabriel M La Toggle-joint wrench with cam release means
US3262343A (en) * 1964-03-27 1966-07-26 Robert W Weller Toggle wrench having automatic abutment adjusting means
FR2237730A1 (en) * 1973-07-20 1975-02-14 Facom
US7313989B1 (en) 1999-06-11 2008-01-01 Tortolani Jr Kenneth Guy Parallel jaw locking toggle pliers/wrench
DE10037348A1 (en) * 2000-07-31 2002-02-21 Rodo Ketten Kettenfabrik Gmbh Jointing clamp; has jaw fixed to main shell and second jaw linked to main and counter shells, where jaws have straight sides that fit together with aligned semicircular depressions in each jaw
US6626070B2 (en) 2001-05-04 2003-09-30 Irwin Industrial Tool Company Compound toggle link retention mechanism
US6591719B1 (en) 2001-07-19 2003-07-15 Newell Rubbermaid, Inc. Adjustable pliers wrench
US20060089651A1 (en) * 2004-10-26 2006-04-27 Trudeau Jeffrey L Apparatus and method for anchoring a surgical rod
US20080154277A1 (en) * 2004-10-26 2008-06-26 Scott Machalk Tool apparatus for locking a spinal rod in an anchoring device therefor
US20080195155A1 (en) * 2007-02-12 2008-08-14 Jeffrey Hoffman Locking instrument for implantable fixation device
US20080228233A1 (en) * 2007-02-12 2008-09-18 Jeffrey Hoffman Instrument for manipulating spinal implant system
US20090157125A1 (en) * 2007-02-14 2009-06-18 Jeffrey Hoffman Spinal Rod Reducer and Cap Insertion Apparatus
US8308774B2 (en) 2007-02-14 2012-11-13 Pioneer Surgical Technology, Inc. Spinal rod reducer and cap insertion apparatus
US20090228054A1 (en) * 2008-01-29 2009-09-10 Jeffrey Hoffman Rod Locking Instrument
US8235997B2 (en) 2008-01-29 2012-08-07 Pioneer Surgical Technology, Inc. Rod locking instrument
US20110202096A1 (en) * 2010-02-12 2011-08-18 John White Spinal Rod and Screw Securing Apparatus and Method
US8900240B2 (en) 2010-02-12 2014-12-02 Pioneer Surgical Technology, Inc. Spinal rod and screw securing apparatus and method
US20150158151A1 (en) * 2013-11-01 2015-06-11 Curtis Brown Ratchet adjustable locking pliers
US20150266177A1 (en) * 2014-03-21 2015-09-24 Richard Conklin Multi-purpose locking pliers
WO2017134069A1 (en) * 2016-02-04 2017-08-10 Knipex-Werk C. Gustav Putsch Kg Pliers having two pliers handles

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