US902305A - Wrench. - Google Patents

Description

H. F. LARAVA.

WRENCH. APPLICATION FILED M AY 14. 1908) Patented Oct. 27, 1908.

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HENRY F. LARAVA, OF WORCESTER, MASSACHUSETTS.

WRENCH.

Specification of Letters Patent.

Patented Oct. 27, 1908.

Application filed May 14, 1908. Serial No. 432,841.

To all whom it may concern:

Be it known that I, HENRY F. LARAVA, a citizen of the United States, residing at lllorcester, in the county of wWorcester and State of Massachusetts, have invented a new and useful lVrench, of which the following is a specification.

This invention relates to a wrench, which while capable of general use to a certain extent, is especially adapted for use in removing fruit jar covers and the like.

The principal objects of the invention are to prcvide a simple and convenient construction for this purpose, having a movable jaw which can be tightened in a very simple manner with the application of a small amount of force in such a way as to securely clamp the jar cover or other article to be secured, and which can be constructed of a small number of parts, each made in a simple and inexpensive manner.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which i Figure 1 is a side elevation of one form of the invention showing how it is applied to a fruit jar cover; Fig. 2 is a plan of a portion of the same; and Eig. 3 is a view similar to Eig. 2, showing another way in which the invention may be carried out.

The device is shown as constructed in the forni of a straight bar preferably of sheet metal having a handle 11 at one end, and an integral jaw 12 at the other formed by turning down the end of the bar and rounding it if desired to make it correspond with the edge of the jar cover or the like. The inner surface of this jaw may, if desired, be knurled, roughened, or provided with teeth. 0n the bar at a proper distance from the stationary jaw 12 is located a movable jaw 13 which is provided with sharp teeth extending toward the stationary aw, preferably of such character as to give the necessary grip at this point so that the stationary jaw will not have to be provided with any teeth. This jaw 13 is preferably made of a piece of sheet metal and in the form shown in Figs. 1 and 2 it is provided with a rear end 141i and with lips 15 extending up over the bar so as to hold the jaw slidably thereon in a very simple and convenient manner, all of said parts of the aw being formed in one integral piece and stamped out of sheet metal. In order to tighten this jaw in position on the jar coverl or the like a wedge is provided which preferably consists of a screw head 16 extending below the bar and provided with a screw 17 extending through a perforation through the bar. A thumbnut 18 is provided for tightening up the screw, and a washer 19 for an obvious purpose. This screw is stationed at the proper distance from the stationary jaw so that when the device is applied to a jar cover or any other article, to which it may be adapted, the loose aw may be tightened up by turning the thumb-screw to draw the conical head of the screw transversely against the rear edge of the jaw 13 so as to force it forward slightly and clamp it in position. It will be seen that by this simple construction, advantage is taken of two simple mechanical elements, the screw and the wedge, for securing a clamping action, and thus with a small expenditure of energy the jaw is iirmly clamped on the jaw cover.

ln the form of the invention shown in Fig. 3, the parts are illustrated in the same way, except that the jaw 21 is not provided with any ears, but is held on the bar by means of a rivet E22 extending therethrough, and is provided with an elongated slot 23 through which the rivet passes, so that the jaw may move longitudinally on the bar. The clamping action is secured in the same way in this case as before.

It will be seen that the invention is capable of being constructed in a simple and convenient manner, and with very small expense, and that the parts are so constructed that a great deal of force can be applied to the movable aw of the wrench without applying much strength to the thumb-nut.

l/Vhile I have illustrated and described two forms in which the invention may be carried out, T am aware that many modications may be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore, I do not wish to be limited to the particular forms shown, but

That I do claim is 1. As an article of manufacture, a wrench comprising a straight bar having the end thereof turned down to form an integral jaw of the same width as the bar, and a second jaw slidably mounted on the bar and comprising a sheet metal plate having teeth in the form of the arc of a circle on the side thereof facing said integral jaw and projecting in opposite directions from the center thereof, and having integral ears extending upwardly and lapping over the bar to guide the jaw in its sliding motion thereon.

2. As an article of manufacture, a wrench comprising a bar having a handle thereon and a transverse jaw at the end thereof, a longitudinally movable jaw on the bar, a wedge adapted to engage the movable jaw, and rotatable means on the bar connected with the wedge for moving it transversely of the bar to move the movable jaw therealong.

3. As an article of manufacture, a wrench comprising a movable jaw, a cone adapted to engage the rear edge of said jaw, a screw on the cone, a nut for engaging the screw and moving the cone to move said jaw, and a second jaw.

4. In a wrench the combination of a straight bar having the end turned down to form a jaw, a second jaw movably mounted on the bar and comprising a sheet metal plate having ears extending upwardly and lapping over the bar to hold the j aw in p0- sition, a screw extending through the bar, the head thereof constituting a conical member for engaging the rear of said second jaw, and a nut on the screw on the opposite side of the bar for moving the second jaw toward the first named jaw.

In a wrench the combination of a bar, a jaw thereon, a second j aw movably mounted thereon and having integral lips extending over the edge of the bar to hold it in position, said bar being perforated at the rear of said movable jaw, a screw extending through the perforations, the head of the screw constituting a wedge for engaging the movable jaw, and a nut on the screw for moving the movable jaw.

6. The combination with a wrench handle, of a fixed jaw, a movable jaw, a conical member for engaging the rear of the movable jaw, and means for drawing the cone transversely to move the movable jaw toward the -fixed jaw.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

HENRY F. LARAVA. lVitnesses:

WILLIAM A. DEAN, DAVID H. DEAN.

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