US169144A - Improvement in saw-sets - Google Patents

Description

W. BURGESS.-

Saw-Set,

No. 169,144, 7 PatentudOct.26,l875.

WITN EgSES W QIVENTOR ATTORNEYS WARREN BURGESS, OF 'TONIOA, ILLINOI IMPROVEMEN Specification forming part of Letters Patent No. 169, 144, dated October 26, 1875; application filed A ril 24, 1875.

i T 0 all whom it may concern:

Be it known that I, WARREN BURGESS, of Tonica, in the county of La Salle and State of Illinois, have invented a new and valuable Improvement in Saw-Sets; and I do hereby declare that the following is a full, clear, and exact description of the construction and op.- eration of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a plan view of my device, and Fig 2is a detail view of the same.

This invention has relation to improvements in devices for setting saw-teeth; and it consists in the construction and novel arrangement of the obtuse-angled guide-bend of the main stem extending transversely across the face of the jaw, and ofthe notched detachable spring-jaw, in combination with the lever-stirrup, as hereinafter shown and described.

In the annexed drawings, A designates the stem or body of the implement, which is made of anysuitable metal, and is mounted, for convenience of manipulation, in a wooden handle, a. The free end of this stem is bent in a right line across the face of the jaw, at an obtuse angle to its length, so that the broad base of the tooth will have a full guide in bending, which will, in a manner, fill the angle and prevent theadjacent flexible part of the saw-blade from being bent too farinthe opposite direction, which would tend to set the tooth farther out than the gage requires. Its extremity is provided with a screw-threaded perforation, into which is passed anadjusting, thumb-screw, b, the object and mode of operation of which will hereinafter be made clear. B represents a strong steel spring, preferably of the same Width of the stem, and rigidly secured thereto by means of a screw, 0, passing through its end into the shank. This spring gradually thickens-from its point of attachment to the stem until it reaches its free end, where it presents a considerable enlargement,

d, the front edge of which is inclined and beveled, forming a point, e, greatly resembling the shape of a saw-tooth. This point extends somewhat beyond the bend c of the main jaw, forming a recess to guide the tooth into the bite. It constitutes one of the jaws of my improved saw-set, the other being supplied at the angular bend e of the adjusting-arm f, and the body of the stem and spring B is forced with its point 6 against the other jaw of the set by the following simple and reliable mechanism: 7

A lever, L, of suitable form and strength, is pivoted, by means of a screw, 9, between two bearings, 2', so that its weight end shall reach to the angle formed by the adjustingarm and the body of the stem, its power-arm extending rearwardly to a point where it may be conveniently reached by the finger of the operator holding the handle in his hand. This lever is connected by means of a stirrup, D, to spring B, the said stirrup being seated ina notch, z, in the back of the spring-jaw, embracing both the spring and the stem, and

being pivoted at j to the weight end of the lever; hence, when the power end of the le ver L is thrust inward by the operator, its weight end will be thrust outward, thus drawin g the spring-jaw into contact with the rigid stem, and rigidly griping the tooth of a saw interposed between them, so that it may be conveniently set at any desired angle, which angle-will be increased by unscrewing the adjusting-screw b, and lessened by setting up the same. When the lever is released jaw B will automatically open for the insertion of a second tooth.

With a view to preventing Stirrup D from slipping, it is received into a corresponding notch, z, in the back of spring-arm B, as shown in dotted lines, Fig. l. I

When the jaws require to be ground true the stirrup D is slipped out of its notch,

screws g and c removed, and the jaws taken apart.

I am aware that a saw-set having its jaws constructed of one bent piece of metal has a lever andamad'ustablei stirrup, as; shown asspeeifledi in Letters Patent granted to E. S. Holkins,

dated April 8, 1851, No. 8,026, and ltherem ,hereunto subscribed myname in the presence of two witnesses.

fore lay no claimto such invention.

What I claim as QQWQQIHXQSSHQJQQQHEQ 3 by LettersPatentfls- The saw-set herein described, having the obtuse-angled jaw A, the detachable. springjaw B, notched at z, and the lever L, having l eretdfime: employed" pengmetion the; St!

m P r new? v In testimony that claiin the above I have i WARREN BURGESS.

Witnesses:

HEN-m: Gmm,

JOHN .A. WILSON.

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