US129731A - Improvement in saw-frames - Google Patents

Description

W. HANKIN'.

Improvemeflt in Saw- Frames.

YWITNESSE'S. Q I Q IN ENTOR No, 129,731, Pz ltented luiy 23, 1872.

the brace and cross-bar.

. UNIT D; STATES PATENT OFFIC WILLIAM HANKIN, OF HAWLEY, PENNSYLVANIA.

' IMPROVEMENT m SAW-FRAMES.

Specification forming part of Letters Patent No. 129,?31, dated July 23, 1 872.

To all whom it may concern:

Be it known that I, WILLIAM HANKIN, of

' Hawley, in the county of Wayne and State of Pennsylvania, have invented a new and val- 1 uable Improvement in Saw-Frames; and I do ,hereby declare that the following is a full,

clear, and exact description of the construction and operation of the same, reference be ing had to the annexed drawing making a part of this specification, and to the letters and figures of reference marked thereon.

The figure of the drawing is a representation r of a side view of my invention, partly sectional.

This invention has relation to the construction of buck-saw frames; and it consists in 3 providing such a frame with an oblique adjustable cross-bar and oblique brace runningfrom after set forth.

In the accompanying drawing, the letter A designates the saw-blade. B indicates the long side bar or handle of the frame, mortiscd near its upper end at a, and toward the sawblade at b, to receive, respectively, the ends'of B represents the short side bar, having, at about its middle portion, a curved shoulder, c, which is provided withma long mortise, d, to receive the tenoned front end of the cross-bar. The lower end of the mortise c is about even with the lower end of the opposite mortise in the handle; but its upper end extends some distance above the upper end of the said opposite mortise. O designates the cross-bar, having one of its ends .inserted in the mortise in the handle and the other inserted in the long mortise of the short side bar. When pressure is applied to the upper ends of the side bars the tendency of the front end of the cross-bar, which is provided with convex shoulders on each side of the tenon, is to ride up on the concave shoulder a of the short side bars,thus throwing the cross-bar into an obliqueposition, with its front end further from the blade than its rear end.

D represents the oblique brace, the rear end of which is seated in the uppermortise of the handle, and the forward end of which is stepped inva seat, 2, in the upper surface of the crossthe twisted cords, drawingthe upper ends of the side bars together, will, through the oblique brace D, tend to force the movable front tenon of the cross-bar downward toward the sawblade, thus pressing outward the rear tenon of the cross-bar, and with it the lower end of the handle, thus straining the blade. In my frame the cross-bar and brace are arranged to sustain the oblique strain of the work, which has a tendency to draw the lower end of the short side bar toward the upper end of the handle. At the same time the oblique brace is arranged to run from the crossbar to that portion of thelon g side bar which is grasped by the left hand, so that any extra pressure brought upon this portion of the frame, which, in the ordinary constructions, is least able to sustain able tenon further down in the long slot and thus strengthen still further thebracing action.

Sometimes an auxiliary brace, n, is placed between the end of the brace D and the short side bar to keep this end of the brace 1) securely in place.

What I claim as new is In a buck-saw frame, the combination, with the side bar B having the concave slotted Witnesses:

- WILLIAM H. HANKIN, Jr,

Z. E. SMITH.

bar, near its forward end. The torsion upon it, will only have a tendency to force the movshoulder c, of the oblique cross-bar 0 having

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