US439201A - Monkey-wrench - Google Patents

Description

i y UNITED` lSTATE-s PATENT OFFICE.

FRANK L. SMITH,` oE BLUE ISLAND, ILLINOIS.

SPECIFICATION forming para of Letters raient 'Noifieaeon dated october es, 1890.

Application iiled August 28, 1890. Serial No. 363,318. (No model.)

To a/ZZ whom it may concern:

Be it known that I, FRANK L. SMITH, a citizen of the United States, residing at Blue Island, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Monkey-Wrenches, of which the following is a specification. Y

My invention relates to improvements in monkey-wrenches; and it consists in the construction hereinafter described and claimed.

Like letters refer to the same part-s in the several figures of the drawings, in which- Figure lis a side elevation of my invention.

Fig. 2 is a longitudinal vertical section of thev Same. Figs. 3 and 4. are cross-sections of the same, respectively illustrating the nut in and out of engagement with the screw-thread on the shank of the wrench. Fig. 5 is a side elevat-ion of a modified form of the wrench.

The well-knownform of monkeywrench has its movable jaw actuated by a nut registering with screw-threads upon the shank of the wrench 5 but this form, though eective, is slow in its operation, and my present invention is designed to retain the eectiveness of the old form and render it possible to manipulate the movable jaw of the wrench with greater rapidity than before.

The main shank of the wrench is designated by the letter B, and it has upon one end the iixed jaw A and upon the other end the handle H, and intermediate of these parts a screwthread F, and, if desired, may have a Scale on one of its lateral faces. The screw-thread upon the shank is according to my invention formed only on two sides of the same-nto wit, top and bottom-leaving the lateral faces of the shank plain. I prefer also to construct these portions of the screw-thread immediately adjacent to the at faces of the shank in a tapering or pointed form, as shown in the drawings, for a purpose which will hereinafter be mentioned. Surrounding this screw-thread is a long nut D, which may have upon its eX- terior roughened portions to afford a grip for the hand of the operator. This nut is provided at its interior end with a groove Gr, ezttending some distance around its periphery, and which, preferably, is half such distance; and a movable jaw C, having the usual eXtension or ferrule I, is constructed to slide freely over the screwthreaded shank, and formed upon the same at its outer end is a lug E, which is made to fit and move in the groove G of the nut. `This lug may be of any suitable width; but I prefer to construct it of a width corresponding with about one-fourth of the distance around the nut. In Fig. 5 I have shown the inner surfaces of the two jaws serrated or roughened for the purpose of enabling them the better to take hold of a metal pipe or Similar object.

The operation of my invention is as follows: When it is desired to Set the jaws at a definite distanceapart so as to grasp an object, the nut is turned until the Unthreaded portions therein are adjacent to the threaded portions of the Shank, the groove in such nut permitting it to be so turned without affecting the movable jaw. Then the nut and movable jaw are pushed toward the lined jaw to the required distance, and this can be done rapidly, because these parts will slide freely over the threads of the shank. Next, the nut is turned until its threads engage the threads of the shank, and by turning such nut a quarterrevolution, or less if required, the male and lfemale threads are interlocked and cause the movable jaw to tightly grasp the object to be clamped and to be locked in that position. Again, when it is desired to release the object thus clamped and apply the wrench to some other object a slight turn of the nut will unlock the parts and disengage the threads thereof and permit a quick and easy backward movement of the movable jaw and nut to the required distance, when they may be set as before. The ends of the threads upon the shank are made pointed or inclined, so as to facilitate their engagement with the threads of the nut. If the ends of the thread upon the shank were abrupt, there would be difficulty in engaging them with the female threads of the nut.

It is obvious that many variations may be made by o'ne skilled in the art in the details of my invention without departing from the spirit thereof, and I therefore do not wish to 4be understood as confining myself to the eX- act construction shown and described.

What I claim, and desire to secure by Letters Patent, is

'IOO

l. A monkey-wrench comprising the usual jaws, a shank threaded upon two of its sides, and a nut for operating the movable jaw, which is threaded so as to correspond with the shank and move loosely over the threads of the latter when desired, substantially as and for the purpose set forth. Y

2. A monkey-wrench comprising the usual shank and fixed and movable jaws, the shank having screw-threads upon two portions of the same and the other portions left plain, and a nut threaded and constructed to correspond with the shank and having a groove formed therein for the reception of a lug upon the movable jaw, substantially as and for the purpose set forth. v

3. A monkey-Wrench comprising the usual fixed and movable jaws, a shank provided with two plain sides and a threaded upper zo and lower surface, the ends of the threads adjacent to the plain surfaces of the shank being pointed or inclined, and an inolosing and operating nut threaded on portions corresponding with the portions of the shank, while left plain upon its other interior surface, substantially as and for the purpose set forth.

4. A monkey-wrench comprising the usual fixed and movable jaws, the latter being provided with a lug at its outer end, a shank with two plain unthreaded sides and two threaded 1 portions, one of the plain sides havinga scale formed thereon, and a nut having its interior threaded and left plain to correspond with the shankV and its exterior provided with a groove for the lug of the movable jaw, sub- 3

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