US38316A - Improvement in screw-wrenches - Google Patents

Description

" UNITED STATES PATENT OEEICE.

ANDREW Y. MCDONALD, OF DUBUQUE, IOWA.

IMPROVEMENT lN SCREW-WRENCHES.

Specification forming part of Letters Patent No. 38,316, dated April 28, 1863; antedated April 8, 1863.

To all whom it may concern,.-

Be it known that I, ANDREW Y. MODON- ALD, of Dubuque, in the county of Dubuque and State of Iowa, have invented a new and Improved Screw-Wrench; and I do hereby declare that the following is a full, clear, and

exact description of the same, reference being is a front edge view of the same.

Similar letters of reference indicate corresponding parts in the two figures.

The object of this invention is to obtain a screw-wrench which may be quickly applied to its work and adjusted with the greatest facility, so as to obtain a iirm hold on the nut, and at the same time be simple in construction, strong, durable, and capable of being manufactured at a reasonable cost.

To this end the invention consists in the employment or use, with a stationary jaw, of a sliding jaw applied to the shank of the wrench, in connection with a spring, screw, and stop, the latter fitting in holes in the sha-nk, and all arranged as hereinafter shown and described.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the shank of the wrench, which has a handle, B, fitted on one end of it, and a stationary jaw, O, at the opposite end. The shank A is of square form, and upon it there is placed a sliding jaw, D, having a spring, E, attached to its back end, which bears against the back of the shank A. In the under side of the sliding jaw D there is fitted in an internal or female screw, af, a male screw, F, which has a small thumb-wheel, G, attached permanently to it, and beyond or below the thumb-wheel there is a smooth arbor, b, which is a portion of the rod on which the screw A is formed or cut. This arbor b passes through what may be termed a stop, H, which is simply a square piece of metal having a cylindrical projection, c, at its inner side, which fits in any of a series of holes, d, in the shank A, as shown in Fig. 1, and this projection is retained in said holes by the spring E, as will be fully understood by referring to Fig. 1. The opening or hole in the sliding jaw is beveled at the sides adjoining the front and back edges of the shank A, as shown at ax in Fig. 1, in order to admit of said jaw being pressed forward at its lower part, to allow the projection c to be thrown free from the hole d in which it is fitted, and thereby permit the jaw D to be wound on the shank. This may be accomplished by simply pressing the thumb on the back and lower part of said jaw. The jaw D,

i therefore, it will be seen, may be Very readily adjusted to the nut, and when brought in contact with it said jaw is relieved of the pressure of the thumb, and the spring E draws the projection c into the hole d in the shank which is opposite to it. The operator then causes the sliding jaw to bind or press firmly against the nut by turning the screw E, through the medium of the thumbwheel G, the stop H serving as a bearing for the screw. By this means the nut will be firmly clamped between the two jaws.

l would remark that the outer end of thc arbor Z is headed, or provided with a button, bx, in order to prevent the stop being casually detached from it.

By this invention I obtain a comparatively long movement or adjustment of the jaw D, considerably longer than those of other Wrenches of the same size. The jaw D may be quickly and readily applied to its work, and the nut firmly grasped between the two jaws C D, and at the same time a strong, durable, and cheap wrench is obtained.

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

The sliding jaw D, provided with the spring E, in combination with the stop H and screw F, the latter being fitted in an internal or female screw, a, in the jaw D, and the stop H provided with a projection, o, to fit in holes d in the shank A of the stationary jaw G, substantially as and for the purpose herein set forth.

A. Y. MCDONALD.

Witnesses:

JOHN MORRISON, Rom'. L. HILL.A

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