US1490903A - Wrench - Google Patents

Description

April 22, 1924. 1,490,903

" G. B. ANDERSON WRENCH original Filed Jan. 21, 1921 @n gf.

Patented Apr. 22, 1924.

" UNITED STATES PATENT OFFICE.

WRENCH. i

'application' aieazanuary 21, 1921, serial 110.433,93?. Renewed January as, 1924.

To aZZwLom t may concern.' y

Be it known that I, GEORGE BnFoRD AN- DnRsoN, a subject of the `King of Great Britain, and resident of Detroit, Michigan, have invented certain new and useful Improvements in Wrenches, of which the following` is a specification;

The invention relates to improvements in wrenches as described in thedpresent specification and shown in the accompanying drawings that form a part of the same.

The invention consists essentially o the novel construction and arrangement of parts whereby a wrench of the type in,` which the adjusting nut is movable laterally by means of a lever, is provided with means for transformin the rotary pressure of said lever to a longitu inal pressure against said nut.

The objects of the invention are to facilitate the operation of the wrench by reducing to a minimum the friction between the movable parts, to lengthen the life of the wrench, to permit of the rovision of a new disc from time to time wit out the necessity of replacing the nut, and generally to provide a wrench which will be inexpensive to manufacture, efficient in operation, and durable.

In the drawings Figure 1 is a side view of the wrench, a portion being broken away to show the arrangement of the otherwise concealed parts.

Figure 2 is an edge view of the wrench.

Figure 3 is a cross sectional view taken on the line A-A of Figure 2.

Figure 11 is a side elevation of the movable jaw.

Figure 5 is an end view of the movable jaw.

Figure 6 is a perspective view of the disc interposed between the adjusting nut and the lever used to eiect the lateral movement of said nut.

Like numerals of reference indicate corresponding parts in the various figures.

Referring to the drawings A represents the main portion of the Wrench,comprising a head 1 having an integral jaw 2 from one side thereof and an integral handle 3 from the side opposite the rigid jaw 2. y

f1 is a movable jaw having atongue 5 slidable in a lateral opening 6 through the head 1 to permit of adjusting said jaw 4 in relation to said jaw 2, said tongue 5 being threaded as at 7 along the under edge thereof.

8 is a worm nut rotatably mounted in a transverse cut 9 in the head 1 on a fixed pin l0, said nut being somewhat shorter than said cut or' gap 9y and being adapted to` mesh with the threads 7 of the tongue 5 and upon rotation imparting longitudinal movement to the movable jaw 4 in relationto the rigid iaWQ. n As the gap 9 isof greater length than the nut 8 it will beapparent that said nut,vthe tongue 5 and the yjaw `dare movable laterally in relation to the jaw 2 without thel necessity of rotatinglsaid'nut, thus `making it possible to adjust the y pressure of the jaws on the nut or other object being gripped without rotating the screw-8. Y f

"Thethread'of the nut 8 is preferablymof substantially ldisc form, that is to say, having one of its walls, designated by the numeral 8, of straight construction and having its other side provided with a slight bevel as at 8b, so that pressure brought to bear on the end of said nut corresponding to the bevelled side of the thread will tend to lock said thread firmly into the notches or threads in the tongue 5 and thus eliminate all possibility of said tongue and said nut being forced apart.

12 is a lever having offset parallel end arms 13 adapted to project' over opposite sides of the section A and beingv pivoted intermediate of their length to said section. and the, side of the gap 9 adjacent to the handle as indicated by the numeral 14, said arms being provided with comparatively small inwardly odset fingers 15 adapted to bear towards the end of the worm nut 8 upon the outer end of the lever being drawn towards the handle 3.

16 is a coil spring encircling the pin 10 between the end of the nut 8 farthest from the fingers 15 and the end of the gap 9 and exerting pressure on said nut to hold the jaw 4 to its extended position.

It is necessary to provide a means for eliminating the friction between the nut 8l and the fingers 15 caused by the rotary motion imparted to said fingers upon the compression of the lever 12 and to this end a disc 17 of greater thickness than the width of an .individual thread of the tongue 5 and having a concaved end 18 adapted to substantially follow the general contour of the under side of the tongue 5, is loosely mounted on the pin 10 between the end of the nut 8 and the fingers 15 so that when the lever 12 and the handle 3 are compressed said washer or disc will receive the rotary or rictional pressure of the fingers 15 While the nut 8 will receive even pressure over the whole end surface thereof.

In the operation of the vinvention the jaws are first adjusted by means of the nut 8 to approximately the size of the object to be turned and the wrench is grasped with the handle 3 next the palm of the hand.

The jaws are then placed over the object to be'turned and the lever l2 drawn inwardly towards the handle 3 causing the tingers l5 to bear with a rotary movement against a comparatively small portion of the surface of the disc'l which permits of even longitudinal pressure being imparted to the nut 8 forcing said nut and consequently the jaw 4 towards the rigid jaw 2 and closing said jaws firmly over saidobject.

To take a fresh grip on the object the pressure kon the lever 12 is relieved and the wrench swung around to the desired posif tion when the jaws are again brought together to firmly engage the object by renewed pressure on said lever. The jaws 2 and 4 may be provided with Anotches 19 thus permitting of grips being taken y,either on 2a theliat or corners of va nut as desired.

What I claim is A wrench comprising a handle terminating in a head 'forming onejaw and having a substantially rectangular worm slot and a track for the movable jaw, a movable jaw having a rack base projecting into saidslot, and slidably arranged on said track, a screw nut freely turning on a fixed shaft across said slot and vengaging said rack Vfor adjusting said movable jaw, a stop slidably `arranged on said shaft and engaging said nut `'and shaped to clear said rack and a lever handle spring-held to its open position and havin an offset engaging Vsaid :sliding stop an" pivotally secured to the aforesaid handle.

Signed at the cityV of Toronto, this 13th day of December, 1920.

GEORGE BURFORD ANDERSON.

Witnesses:

W. G. HAMMOND, G. MURPHY.

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