US1364937A - Monkey-wrench - Google Patents

Description

0. H. KIRKPATRICK.

MONKEY WRENCH.

APPLICATION FILED 050.16. |919.

1,364,937. v Patented Jan. 11, 1921.

W MII OTEY R.. KIRKPATRICK, OF FORT WORTH, TEXAS.

MONKEY -WRENCI-I.

Specification of Letters Patent. Patented Jan. 11, 1921.

Application filed December 16, 1919. Serial No. 345,309.

To all 'whom t may concer/n Be it known that I, O'rnY R. KIRKPATRICK, a citizen or' the United States, residing at Forth Worth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Monkey- IVrenches, of which the following is a speci- 1'ication.

My invention relates to wrenches` and more particularly to monkey wrenches; and the object is to provide wrenches which can be instantly adjusted to any ordinary size nut and which has advantages over existing monkey wrenches and which is provided with an improved adjustment whereby the wrench can be adjusted for different sizes of nuts by the same hand which is using the wrench and which is simple in construction and which can be easily and quickly adj usted to any required grasp and which may also be used as a pipe wrench. Other objects and advantages will be fully explained in the following description and the invention will be more particularly pointed out in the claim.

Figure 1 is a side elevation of the wrench. Fig. 2 is an edge view of the same. Fig. 3 is. a longitudinal section of the movable jaw and a broken section of the handle or power arm and showing how the movable jaw is locked stationary for use. Fig. 1 is an elevation of the work end of the locking plunger. Fig. 5 is a side elevation of the wrench with the movable jaw provided with a shoe. Fig. 6 is an edge view of the same.

imilar characters of reference are used to indicate the same parts throughout the several views..

This invention includes a handle or power arm 1 having a stationary jaw 2 integral therewith. The wrench is also provided with a movable jaw 3 which has two yokes 4; and 5 which receive and move on the power arm 1. The yokes have openings to receive the arm 1 and the yokes are preferably integral with the jaw 3. A portiono'f the power arm 1 is provided with' teeth and means are provided for locking the jaw 3 to the power arm 1. The jaw 3 has formed integral therewith a lock-carrying member 7 which has a chamber therein-for a plunger lock 8 which has teeth corresponding to the teeth on the power arm. A spring 9 holds the lock 8 in engagement with the power arm. The teeth on the power arm have one l shoulder or side of each tooth at right angles to the power arm and the lock 8 has teeth which have `one shoulder or side at right angles tothe lock 8 so that the lock may be released from the power arm by a, pull at right angles to the power arm and another object in this construction is that the teeth of the lock will go directly into the teeth of the power arm. This will prevent the jaw 3 from receding from the obj ect to be. grasped. The lock 8 is actuated for releasing by a pivoted lever 10 which is fulcrumed in a chamber 11 in the lock-carrying member 7. The lever 10 engages the lock 8 loosely by reason of the notch or recess in the side of the plunger lock. The fulcrum pin 12 is inserted through the walls of the lock-carrying member.

The advantage of the construction shown herein is that the lock 8 does. not rest on a pivot pin during the strain, as in other wrenches. The lock bears against a solid bearing wall 13 of the lock-carrying member 7 when the jaw 3 is under strain and the flat surfaces of the teeth of the lock bear against the flat surfaces of the teeth 6 of the power arm. At the same time the spring 9 is holding the teeth in engagement. The 'flat bearing wall 13 coperates with the lock 8 to sustain the entire strain against the movable jaw 3.

The variation shown in Figs. 5 and 6 includes a jaw 14 and a shoe 15 mounted thereon. In this form of the device, the shoe may be made of a different metal from the power arm 1.

The movable jaw 3 has increased strength because it has the lock-carrying member 7 integral therewith, thus. making a long bearing and the yoke` 5 tends to keep the grip surface at right angles to the handle 1. The lock 8 cannot be displaced because of the four walls ofthe cavity or chamber which retains the lock.

What I claim, is,-

A wrench of the type described, comprising a shank, a fixed outer jaw carried thereby, rack teeth formed upon the inner edge of said shank, a movable inner jaw and frame having a longitudinal opening therethrough and slidably mounted onsaid shank, said frame having a recess therein rectangular in cross-section and extending at right-angles to the longitudinal aXis of the shank, and from said longitudinal opening into said frame and one wall of said recess constituting a bearing wall, a ratchet block rectangulai 1n cross-Section slidable in said recess and gulded hy the Walls thereof With the teeth of the block maintained 1n position to engage the shank teeth for coperating with said bearing Wall to sustain the sti'ain on said movable Jaw, said block having a side notch7 a spring Within said recess the handle of the Wrench, and a lever pivoted Within said opening and extending into the side notch of the ratchet block and normally standing idle and adapted to shift said block from engagement With the toothed shank and against tension of the spring, and provided with a handle in line With the handle of the Wrench.

In testimony whereof, I set my hand, this fifth day of December, 1919.

OTEY R. KIRKPATRICK.

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