US455821A

US455821A - Wrench

Info

Publication number: US455821A
Authority: US
Publication date: 1891-07-14
Anticipated expiration: 1908-07-14

Description

(No Moaex.)

I'. P. SCHOPIBLD.

NITED STATES ATENT GFFiCE.

FREDERICK F. SCHOFIELI), 0F OSG/ODA, MICHIGAN.

WRENCH.

SPECIFICATION forming part of 'Letters Patent No. 455,821, dated July 14, 1891.

" Application led November 28, 1 8 90.

T0 all whom, it may con/cern:

Be it known that I, FREDERICK F. SoHo- FIELD, a citizen of the United States, residing at Oscoda, county of Iosco, State of Michigan, have invented a certain new and useful Improvement in IVrenches; and I declare the following to be a full, clear, and exact description of the invention, such as Willenable others skilled in the art to which it appertains to make and use the same, reference being had tothe accompanying drawings, which form a part of this specieation. p My invention has for its object certain new and usefulimprovementsin a monkey-wrench, having in view superior eflicien cy, durability, simplicity, and economy.

I carry out my invention as hereinafter specified and claimed, and illustrated in the accompanying drawings, in which- Figure l is a vie-W in perspective, and Fig. 2 is a longitudinal section.

The more especial `feature of my invent-ionY is to provide means for facilitating the adjustment of the jaws, so that they can be quickly set as desired.

To this end A represents a xed jaw provided with a shank A., engaged with a handle A2. B denotes a movable jaw provided with a shank B. The jaw A and its shank A are recessed, as shown at a, to receive the shank B of the jaw B and allow its reciprocation therein. The shank B is recessed to- Ward its rear end, as shown at b, to receive a spring bar or latch C, said bar havinga serrated upper face to engage a similar serrated face on the under side of the upper wall of the recess a, as shown at a. A spring D is located under the bar C to hold said bar in normal engagement with the shank A', in which engagement it is evident the jaW B is held in a fixed position. A thumb-screw E has a screw-threaded engagement with the bar C, said thumb-screw extending through an elongated orifice d2 in the upper Wall of the shank A', allowing the free movement of the thumb-screw back and forth in said oriice. The thumb-screw preferably has a milled the same.

head, as shown.

Serial No. 372,925. (No model.)

The operation of the wrench Will now be clearly understood. The operator, With his hand upon the handle and his thumb upon the head of the thumb-screw, presses downward, disengaging the spring-bar C from the serrated face of the shank A', the size of the recess b and of the bar allowing for a suitable depression of the bar to permit said disengagement, when, it Willbe seen, a forward or backward movement of the thumb uponthe head of the thumb-screw Will move the jaw B to any desired position. By releasing the thumb the spring-bar C will renew its engagement with the-serrated face of the shank A and hold the jawB in the position to which it has been adjusted. IE it is desired to more securely hold said jaw in a given position to which it may be adjusted, the thumb-screw may be turned down, drawing the bar C into firmer engagement with the serrated face of the shank A and holding it there in a very se# cure manner and preventing any accidental yielding of the spring-bar in any strain that may come upon the wrench or in handling The arrangement is such that the thumb-screw is in a most convenient position, so that the wrench can be operated in a most ready and expeditious manner.

What I ela-im as my invention isl. ln aWrench, the combination, with a iixed rocatory movement in said recess of the fixed v jaw and shank and a spring bar o r latch to engage each of said shanks and hold the movable jaw in a given position, substantially as described,

3. In aWrench, the combination, with a iixed jaw and its shank provided with a recess, of a movable j aw and its shank having a reciprocatory movement in said recess of the fixed jaw and shank, a spring bar or latch to engage each of said shanks, and a thumb-screw 1o of the iXed jaw, and a thumb-screw extending through said orifice a? and having a screwthreaded engagement with said spring bar or latch, substantially as described.

In testimony whereof I sign this specification in the presence of two Witnesses.

FREDERICK F. SCHOFIEL'D.

XVituesses:

ORIN OUTCHEON, G. H. E. HAWKINS.