US2329181A - Wrench - Google Patents

Description

sept. 14, 1943. A. BOYNTON 2,329,181

' WRENCH Filed April 8, 1939 2 Sheets-Sheet l ALEXANDER 50 wv o/v,

Afro/iwf ys Sept. 14, 1943.

A. BOYNTON 2,329,181

WRENCH l Filed April 8, 1939 2 sheets-sheet 2 from/frs.

yPatented Sept. 14, 1943 y, n u

n WRENCH Alexander Boynton, San ntoniio, Tex. Application April s, 1939, seri-a1 no; 266,758

4 Claims.

My invention relates to wrenches or tongs and particularly; to pipe wrenches.-

The objects are to provide a wrench that (1) y will not mash the pipe, (2) will not score or cut the pipe by deeply embedding teeth', as many other wrenches do, (3) will not slip on the pipe, (4) maybe quickly applied.

I accomplish the foregoing objects by means of a plurality 'of pipe gripper dogs urged inwardly by a roller engaging between twov sur-l faces, one of whichis eccentric to the pipe; these rollers being normally urged by a spring adapted to hold pipe grippers apart so as to admit the pipe, as will more fully appear from the accompanying drawings in which: A

Fig. 1 is a top plan view of the preferred form ofthe wrench Fig. 2 is a section on the line 2 2, Fig. 3.

in Figs. 1 and 2. x

Fig. 4 is a section on the line 4--4, Fig. 1.

Fig. 5 is a side view of one ofthe rollers.

Fig. 6 is an end View of oneof the pipe grippers in Fig. 2.

Figure 3 is a sideY view'of the wrench shown- Fig. 7 is an inside view of the part'shown in Fig. 6. c

Fig.r 8 is a top view of a modified form of the wrench shown in Figs. 1, 2, and 3.

jaw to'retain the tong about the pipe and in gripping position.

The angle between arm la and a line tangent to groove 1a at the point where the roller wheel 2 rst contacts this' groove when the handle'r member I is moved clockwise,- is'such that the roller wheel will urge pipe gripper dogs together, as appears in Figs. 1 and 2.- The stop bumper extension Ib is adapted to engage upon the surfacev5con the head 5 when the handle memv ber VI has been rocked anti-clockwise with relation to the shells 5 and 1 far enough to allow'shell 1 to clear the 'roller wheel 2 as'the wrench is opened. 'Ihe shell 1,'hinging upon bolt B, may then be opened far enough to admit y the pipe I8; the further opening swing of shell The teeth ISb-are concentric with-pipe I8., but

the teeth 5a, are tangent to a circle somewhat larger thanY the pipe, so Vthat the pipe grippers I5l will be forced inward upon pipe I8 when the y rollers I2 are caused to turn clockwise by the handle member lI being moved so that the roller wheel 2 will engage'within the groove 1a of the shell 1. The number of teeth 5a and I5b'and the direction of the tangent are such that the:

rollers I2, in their travel, will permitthe pipe grippers I5 to expandfar enough to loosely sur- Fig. 12 is an end view of the pipe gripper'in Fig. 9.

Fig. 13 is an inside view of the part shownin Similar charactersA refer to similar parts throughout the several views of each embodiment.

With' particular reference to Figs. 1, 2, and 3, the handle member I is hinged to double hinged shell or head 5 by a hinge bolt 4; the single hinged shell or -jaw 1 being also hinged upon head v5 by a hinge bolt 6. The arm Iaof handle member 'I' has `its extremity forked to receivev the roller wheel 2 mounted within the forks upony axle bolt 3.r 'I'he groove 1a., exterior of shell 1,

vis `adapted to receive the roller vwheel 2 for sufycient depth to act as a guide for the roller in the path of its travel. The length of groove 1av tractedpositions upon pipe I8 so that the roller I 2 transmits 'a thrust from the handle I to the round the piper I 8 and contract enough to engage the teeth I5a so tightly upon the pipe that the wrench and pipe will'then turn together.

Each'of the rollers I2 are formed with a short a flange 'I Ia engaging within grooves I5c in thel pipe grippers I5 as seen in Figs. 2, 6, and 7. This engagement of the flanges IIa within secures the assembly of pipe grippers I5.

rFlat springs I6, secured upon flanges Ilotby4 rivets I1 (see Fig. 2) t into the grooves I5c and are adapted to resiliently urge the pipe gripe pers I5 upon the rollers I2 which are thereby kept en meshed with'their mating teeth on both sides, as appears in Fig. 2.

"Each of the's'pring wires I3 hasl one end received within an opening thru the long spindle I2C Where it may be secured by electric spot weld I3a, see Fig. 5. These spring wires, exerting an unwinding torque, are installed wrapped partially around the spindles I2c and are receivedmatically engage near or between the end teethV indicated at Saa and lbb, Fig. 2; this being the most open position of the pipe grppers l5. 'l J= To apply the wrench,` shell l is, swung` open 5 to admit the pipe I8. The handle member I` is` then moved toward the operator, who is assumed to be positioned on the roller wheel side of the v wrench.` A snappy pull of the handle will then cause theroller wheel 2 to; trayel clockwise *inv slot la; thereby urging the slr1ells5-5-y and-.l toward*A each otherand the pipe gripperslEaupon-I the pipe by therolling action of. rollersjlZ which then turn. clockwise and. travel away from.l the endteeth Baa and'wiibo while the pipe grippers4 are closing` uponthe pipe.y i Thefwrench., may be free-dl from the pipe kby y thrusting.the handle away from the operator untilstop :bumper lbengages the surface 5cat whichitime the; roller wheel 2 will-clear shell l and. permit this shellY course, that the terms clockwise and anticlockwise, as relates to the movements of the wrench handleand pipe gripper dogs, become reversed in both iorms of the invention as the wrench is reversed in operation from the positions vshown in the figures discussed by way of illustration.

It is apparent that vmany minor changes and substitutions can be made within the scope of the stated objects and appended claims, and I reserve theV right to make` such changes and substitutions.

What is claimed is: l. In a pipe wrench the combination of a pair of, jaws adapted to surround a pipe, pipe gripping dogs Awithin said jaws, a loose eccentric tongue and "groove connection between said jaws and dogs whereby the dogs are movable radially to be openedA until stop bumperl S17-engages upon,

the surfaceY lo; thus conveniently arresting the.

openine-movementwhen the opening is ample to admitgtheppipe.

signa 9,- ane ioiliustrate. a modiiied form= The partsv of. the` ,modied of `this invention.V form and of lthe preferred `form, indicated; by the same reference characters, are thelsame in construction and purpose. Inthe `modication all -parts are primed whereI these partslare essentially diiierent from theI somewhat similar partsinthe preferred form; While-several parts; iin 4themodification closely resemble similar parts in the preferred form, there arel essential dif'-y ierences; the-principal difference being, thatthe teethon pipe grippers are eccentric. refer@ ence `to )the pipe` and the teeth inthel shell areV conof-mtricy therewith in this form; while in the;k

preferred Vforni the teethy on pipe.. grippers .are concentric withreferenceto the` pipe andthe teeth inthe shell are tangentyto-a circle some-f what larger than the diametep `oft the pipe upon which the wrenchis adapted'to.be` used.E

By referring to the 1z referredV {or-nn illustrated in Figs. 1 to '7, both' inclusive,and,ft he. specification thereof, the constructionof. thisf-modifica7 tion willl .be clearly understood; attention being directedto the fact thatthe only partsinthe.

modincauon which essentially. meeneem, the

n will be noted in Eig'. amat the' pipe-grip:-

pers l5', having lteeth laf to engage the pipe, are eccentric with reference to the pipe, inforden.

to provide a thickening` of the grippers toward one end in order that'fthe v*teeth |5115; 4coa'cting v with the concentricvteeth 5o oithe hinged shells 5.' and l,`A will urge thefpipe ,gripper's .upon vthe pipe when v.the wrench` handle v ismovedl clockwis and away' from the pipe .when tlifejliandleis" moved anti-clockwise.` Ituwill be 'understoodgof and circumferentially, opposed converging surfaces on said dogs and jaws, and roller means between. and. having a.V driving connection with said surfaces forlhQYihg the dogs;inwardlywhen*v the; jaws, are,Y rotated relative to the dogs.`

f 2. In a pipe wrench .the combination of4 a pair of.jawsl adapted to` surround a pipe, pipe grip--v ping Vdogs within. said jaws. and movable relative thereto, opposed converging surfaces on said' jaws and dogs, and rollers drivablyA engaging said surfaces. and `adapted to urge the dogs'- inwardly when a rotative eilort is applied to therjaws to urgethe rollers in the direction of.I convergence;y and resilient means normally tend-ing torotate said rollersv and move the dogs to retractedI position.

3.- In a pipe wrenclnthe .combination of a pair or.` jaws adaptedy to surround a pipe, means for pipe,y a roller having teeth engageable between'.V

Vmeans-,on said; rollers to normally-position same soap ,tdsresilientlyfhold, said grippers radially expanded.

, 4., In alpipe wrench, a jaw. assembly including arpair of. jaws adapted to surround a pipe, means'v forwholdingd. :said jaws. inA predeterminedrelative position about. the pipepipe gripperdogs-within,

saidwjaws, said grippers having internal teeth.'

conforming withand adapted toV embed.' within said pipeto'inipart rotaryiforce theretopafI group.'- of teethon, the exterior-'of each of; saidl gripper/s.'

ariangedeocentrically ,relative to the intenna'lzteeth. spaced, groups ofY concentric-.teeth opposed; tolsai'd` groupsinterior of said jaws,r a' rollerH h'aJ/i11g-teeth| engageable between each pair;A of: said opposedgroups, a` looseannular tongueiand;` groove connection. between said .jaws` andf grip-f.1

pei-sandr n'ieans` thereinv for radially orcingsaldau grippers, to engage saidrollers between?, said.` opy; i

P'Qsel groups??? teeth', means, Ona said rollers-tof 1 normally position same soy as` to` resilier1tl5-.-hgoldzV saidgrippers-radially expanded. Y

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