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Publication numberUS1651216 A
Publication typeGrant
Publication dateNov 29, 1927
Filing dateFeb 3, 1927
Priority dateFeb 3, 1927
Publication numberUS 1651216 A, US 1651216A, US-A-1651216, US1651216 A, US1651216A
InventorsMcgill Arthur A
Original AssigneeMcgill Arthur A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1651216 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Nqv. 29,1927. K 1,651,216


Filed Feb. s, i927 Inventor Amm@ Patented Nov. 29, i927.


Application led yllebruary 3', 1927. Serial No. 165,63"i."'V

surfaces of the jaws, and a secondary fulcrum which is initially ineffective and located adjacent the gripping surfaces for producing powerful leverage and a tenacious u grip Yon the object. v n

AAn important feature of the invention be,- yond the employment of the successive double fulcrum action is an adjustable carrier for the secondary fulcrum, the carrier being movable ata Vpredetern'iined time, then'becomine automatically set and serving to hold the secondary fulcrum stationary, while the movable jaw pivots about it lto bring it into substantially parallelism so with the stationary aw, and to produce the efficient grip; a

Theconfiguration of the parts, as well as their intimate association and relation, will l become more readily apparentfrom the succeeding detailed description.

In the drawings y Figure 1 is a sideelevation'of pliers constructed in accordance with the invention showing the jaws open vand the secondary i fulcrum carrier in released position,

y Fig. 2 is a longitudinal sectiontalen approximately upon the plane on they line Q-2 of Fig. 1, looking in the direction of the arrow,l l

Fig. 3 is a fragmentary perspective lview ofy the movable jaw, y i

F ig. 4 is a perspective view of the secondary fulcrum carrier. ,j

Considering now the drawings'in detail, no it will'be seen that the reference character 1 designates on-e handle or lever which carries the stationary gripping jaw 2. It will be noted that the portion of the materia joining this jaw with the handle is formed of somewhat as a .segment of a circle, this porril) ,3 in inwardly spaced relation to the grippingr wise firmly fastenedv between the outer Wide tion being represented at 8. `Also, thisportion has a sectory 4 `cut out therefrom,and the outer arcuate edge of this sector is `provided vwithv ratchet teeth 5; disposed on an arc of a predetermined curvature.' The curved edge 6 of the segment Bis also of arcuate formation andthe arc 'is that of a circle greater than the circle upon which the toothed arcisbased.

Attention is now invited to' Fig.` 3 wherein the movable jaw member, shown at *7,is represented. .Here the referencecharacter 8 .designates the complemental lever or handle, 9 the relatively niovable'jaw for cooperat-ion'with the jaw.2,rand*10"the webs 70 which jointhis aw with the handle 8. These webs are disposed in spaced "parallelism 'to keach other, and are so spaced as topermit 'them to'st'raddle the segmentalpo'rtion 3.

`VThe lower arcuate edges are formed with notches 11 providing seats for reception of the primary fulcrum pin 12, rigidly mounted on the handle l at the juncture ofthe Vlat'-y ter and 'said 'segmental portion.V yIt will be noted that oney side of the notch :is substan- S ltially hooked in formation, while the vother side is of inclined form to operate' as a cam in a manner to be hereinafter made plain.

The secondary fulcrum carrier is'represented generally by the reference character 13, and this comprises a pair of spaced parallel side plates 14 of Vsomewhat triangular form, thesame being provided at their apices with elongated slots 15. Rigidly or 'otheroo ends is a toothed block 16, the teeth of which are adapted to cooperate with the aforesaid teeth 5. j

In ian opposite corner, are holes 17 cooperating 'with hoies 18 in the webs 10 to ac'- commodate the secondary fulcrum pintles 19. It Will be noticed from Fig.2, that there are two yof these pintles.y They `are however,

referred to, 'as a unit, by theexpression secondary fulcrum. y

It will be noted that the side plates of the ca-rrier'lB are yinterposed between'the wings or vwebsflO and the aforesaid segmentl 3. Also'the bloclrv 16 islocated in the open sector 4.v In addition, ya coiled spring isv connected with this blockand the main fulvcrum pin 12, as shown better inVFig. 2.

Y `It is obvious from the foregoing description, thatF when the vparts are assembled as shown 1n F 1g. 1, 'and the handle 8 is grasped llt) i and moved toward the handle 1, the movable fiile-rum pin 12, in order to obtain the ini-V tial adjustment of the jaws. However` as soon as the movable jaw comes into engagement with the object to be gripped, a resist'- anoe is set up, causing the cam edges of the aforesaid notches 11 to ride outwardly or upwardly upon the fulcrum pin 12. y y, This bodily kmovement naturally -moves the carrier 14,*outwardly until the teethon the bloclrll engage the teeth 5, Vthus temporarily holding the cari'ier 13 against further swinging movement.- ,A further movement of the handler 8, thereby brings the secondary fulcrum 19 into play, whereupon the power is transmitted frein-this fulcrum, which being closejto the gripping surface of the jaw, increases i the leverage, and permits a more sturdy grip to be had.

vlith this arrangement, it is obvious that the ladditien'al movement of the jaw 9, upon the secondary fulcrum pins 19 allows` the jaws toycome more nearly finto parallelism,

thusadaptingthem for gripping flatsided objects as before explained. Of course,

when thel parts are moved 'in a reverse manner the spring 20 retracts the: carrier and allows the parts to resume initial position.

Undoubtedly by considering the descriptionin connection with the drawings, aclear understanding of7 thewinvention as to construction and arrangement of part-s, as well fas'l the advantages and operation will be had.

In view` of this, va more lengthy description "is deemed unnecessary.

Minor'changes comingwithin the held of invention claimed, may be resorted to if desired. v I n j l Having thus described my invention, what I claim as new is :f

1.1:In1a tool :of the classA described, pliers comprisinga jrelatively stationary jaw member embodying a jaw and an operating handle therefor, a main fulcrum pin carried by vsaid handle, a relatively movablel jawy member embodying a jaw, an operating handle fo'r said last named jaw pivotallyand mov- ,ably mounted on said main fulc'rum pin, and

means, interposed lbetween ,thev movable' and stationary aw members" and provided with V a secondary and successivelyoperable fulcrum upon which the movable jaw is also mounted.

` v '2.' Ina structure kofthe V'class described,

pliers rcomprising a" stationary jaw member Vembodying L fjaw and an 'operating handle therefor, a' main' fulcrumv pin carried by said handle,a'movableljaw member including' a jaw ,for cooperationwith said first-named jaw, any operati'ng'handle for lthe movable jaw, the movable jaw and its handle being pivotaliy and shiftably mounted upon the main fuleium pin, a carrier interposed between saidj aw members and handles, and a. secondary fulcrum carried by said carrier, f

lmain fulcrum pin at the juncture ofl said segment and handle, a relatively movableV jaw member including a jaw, an operating handle for said last-named jaw, webs joining the latter jaw with its handle, said webs straddling said segment and being provided with notches forming seats for reception of the fulcrum pin. A v

e, Pliers comprising a stationary jaw member having a jaw and an operating handle therefor connected to said jaw through the medium of a relatively wide segment, a main fulcrum pin yat thejuncture of said segmentV and. handle, a relatively movable jaw member including a jaw, an operating handle for said last-named jaw, webs join'- ing` the movable jaw with` its handle', said webs straddling said segment and being provided with notches-forming seats for reception of themain fulcrum pin, a secondary fulcrum, and a carrier for said secondary fulcrum including spaced parallel plates in-Y terposed between said websand sector, saidwebs being i'oclably connected with the secondary fulcrum on said carrier.

5. In a tool ofthe class described,rpliers comprising a relatively stationary jaw member having a jaw andan operating handle vfor said stati'ona'ryjaw joined thereto thru the medium of a connecting segment, said segment being formed with an open sector, one edge of which is rvformed into an arcuate toothed rack, a Irelatively movable jaw inem- 1 ber includino` a 'aw o Joosed to saidv hrst v'aw an. operating handle for the movable jaw,

.spaced` parallel webs joining the movable jaw with its handle, a primary fulcruin pin located at `the juncture of said segment and j ARTHUR A. MCGLL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2906155 *Sep 7, 1956Sep 29, 1959Miller Wendell SPliers with automatic fulcrum shift
US2988941 *Nov 12, 1959Jun 20, 1961Ira J WarnerPliers
US3232152 *Oct 26, 1964Feb 1, 1966Miller Wendell SAlternative fulcrum hand tool
US3243880 *Sep 3, 1963Apr 5, 1966Weller Robert WPower pincers
US4178682 *Aug 31, 1978Dec 18, 1979H. K. Porter, Inc.Ratchet cable cutter
US6014917 *Jul 1, 1998Jan 18, 2000B!G Ventures, L.L.C.Self-adjusting and/or self-locking pliers
US6116124 *Jun 24, 1999Sep 12, 2000Great Neck Saw Manufacturers, Inc.Adjustable pliers
US6161455 *Dec 28, 1998Dec 19, 2000Great Neck Saw Manufacturers, Inc.Adjustable plier
US6178855Oct 22, 1999Jan 30, 2001B!G Ventures, L.L.C.Self-adjusting and/or self-locking pliers
US6227081Dec 6, 1999May 8, 2001B!G Ventures, L.L.C.Pliers with force augmentation and self-adjustment capability
US6378404 *Jan 20, 1999Apr 30, 2002Big Ventures, L.L.C.Self-adjusting and/or self-locking pliers
US6679140Sep 15, 2000Jan 20, 2004FacomSelf-adjusting pliers for single-handed manipulation
US6694848Sep 15, 2000Feb 24, 2004FacomFast approach self-adjusting pliers for single-handed manipulation
US7299724Jan 24, 2007Nov 27, 2007Warheit Matthew WSelf-adjusting gripping tool
WO2001023143A1 *Sep 15, 2000Apr 5, 2001FacomFast approach self-adjusting pliers for single-handed manipulation
WO2001023144A1 *Sep 15, 2000Apr 5, 2001FacomSelf-adjusting pliers for single-handed manipulation
WO2001039927A1 *Dec 6, 2000Jun 7, 2001Big Ventures L L CPliers with force augmentation and self-adjustment capability
U.S. Classification81/342, 81/366, 30/250, 81/408, 81/365, 81/344
International ClassificationB25B7/10, B25B7/00, B25B7/12, B25B7/04
Cooperative ClassificationB25B7/04, B25B7/12, B25B7/10
European ClassificationB25B7/12, B25B7/04, B25B7/10