US834807A - Wrench. - Google Patents

Description

N0- 834,807. PATENTED OCT. 30,1906. H. F. HOPFMANIL.

WRENCH.

APPLICATION FILED APB. 9,1 906.

UNITED STATES PATENT oFFIoE.

WRENCHL Specification of Letters Patent.

Patented Oct. 30. 1906.

Animation filed April 9, 1906. 'Serial No. 810,673-

To a whom it may concern.-

Be it known that I, HENRY F. HOFFMANN, a citizen of the United States, residing at Stapleton, in the county of Richmond and State of New York, have invented certain new and useful Improvements in Wrenches; and I-do hereby declare the following to be a full, clear, and exact description .ofthe invention, such as" will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates more particularly to that class of wrenches commonly known as pipe-wrenches, wherein one jaw is-stationary, being an integral part of the handle, and the other jaw movable.

The principal object of the invention is to improve generally this class of wrenches, but more especially to improve the movable jaw with a view of rendering it capable of a quick and ready adjustment.

A further object of the invention is to construct and arrange the several parts so as to produce a strong and durable im lernent, one that will firmly grasp and hol any object within its rangeof adjustment.

Other objects will become apparent upon a full disclosure of the invention.

In the drawings, Figure 1 is a side elevation of my improved wrench; Fig. 2, a to view; Fig. 3, a side elevation with one of the side links removed, and Fig. 4 a perspective view of the toothed pawl.

Referring to the several views, the numeral 1 indicates the stationary jaw, which is integral with the handle 2, and 3 the movable jaw, which is integral with the shank 4. The adjacent faces of the res ective jaws are provided with peculiarly-slihped grippingsurfaces, the face of the stationary jaw being provided with upwardly and inwardly inclined teeth 5, transversely arranged, separated by. inwardly extending horizontal notches or kerfs 6, and the face of the movable jaw with downwardly and inwardly inclined teeth 7, also transversely arranged, separated by similar notches or'kerfs 8. By means of these peculiarly-shaped grippingsurfaces a firm and secure grip on a pipe or other object may be obtained.

One of the principal objects to be attained by separating the teeth by the kerfs is to permit of a ready and accurate grinding or dressing up of the teeth when the gripping-points become dull or worn off, and an other object is toprevent the clogging of the teeth by the cured thereto by a bolt 13.

accumulation of dirt, &c. Besides, the kerfs allow for a wider separation of the points of contact of the teeth, so that in handling pipes there is less liability to flatten them, as,

is the case where the teeth are of the ratchet form or type. Y Y I Pivoted to each side of the stationary aw, by means of a bolt 9, is a plate-10,'and between the plates the movable jaw is adapted to be adjusted. The upper edge of the'shank of the movable jaw is provided with transverse ratchet-teeth 11, which are adapted to be engaged by a toothed block 12, interposed between thefree ends of the plates 10 and se- The toothed block is held immovably by a pin 14, and the free end of the shank of the movable jaw is provided with a pin 15, which prevents said jaw becoming accidentally disengaged from its position between the plates.

The toothed block is normally held in engagement with the ratchet-teeth on the movable aw by the pressure exerted by a spring 16, preferably a leaf-spring, which has one end secured to the upper part or edge of the handle and the other end resting against a pin 17, which passes through the plates 10.

V The upper edge of the stationary jaw from approximately the center is inclined or beve ed downwardly in opposite directions to provide bearing- surfaces 18 and 19, on which the movable jaw may be rocked so as to permit the quick and ready adjustment of said jaw, as hereinafter mentioned, and to allow the jaw to resume its normal position. The bearing-surface 19 permits the adjustment of the movable jaw, and bearing-surface 18 permits said jaw to resume its normal position with the toothed block in engagement with the ratchet-teeth on the shank of the movable aw, as shown by the full lines in Fig. 3. To adjust the movable jaw, it is only necessaryto move the connected plates back against the pressure of the spring, as shown bydotted lines in Fig. 3, which operation disengages the toothed block from the teeth in the shank of the movable jaw and sets said jaw free to be moved in either direction. The gripped object maybe readilyreleased by pressing down upon the free end of the movable jaw-shank.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a wrench, the combination with a stationary jaw, and a movable jaw having ratchet-teeth, of side plates pivoted to the stationary jaw and having a toothed block rigidly secured between their free ends, and a spring arranged toexert a pressure against the pivoted plates, to move the toothed block into engagement with the movable jaw.

2. In a wrench, the combination with a stationary jaw and a movable jaw, the sta' tionary jaw being provided with oppositely inclined bearing-surfaces upon which the movable jaw is adapted to be rocked, to allow for adjustment, and the movable jaw with ratchet-teeth upon its upper edge, of springpressed plates pivoted to the stationary jaw, and a toothed block rigidly secured between the free ends of the plates and adapted to engage the ratchet-teeth of the movable jaw, said plates being adapted to be rocked to cause the engagement of the toothed block with the movable jaw.

3. In a wrench, the combination with a stationary aw having inclined gripping teeth, separated by horizontal kerfs, of a movable jaw having gri ping-teeth, said teeth being corresponding y inclined to those of the stationary jaw and separated by horizontal kerfs, and spring-pressed plates pivoted to the stationary jaw, and through whrdch the movable jaw is adapted to be operate 4. In a wrench, the combination with a stationary jaw having inclined grippingteeth, separated by horizontal kerfs, of a ratcheted jaw havin gripping-teeth, said teeth being correspondingly inclined to those of the stationary jaw and separated by horizontal kerfs, a spring-pressed plate pivoted to the stationary jaw, and through which the ratcheted jaw is adapted to be moved to any desired position, and a toothed block arranged in the outer end of the yoke to engage said ratcheted jaw.

In testimony whereof I afiix my signature in the presence of two witnesses.

HENRY F. I-IOFFMANN.

Witnesses:

WILLIAM G. WILsoN, CHARLES ALPHA MORGAN.

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