US271159A - Drag-saw - Google Patents

Description

(ModeL) O. THOMPSON.

DRAG SAW.

Patented Jan.23,1883.

ATTORNEYS.

WITNESSES IJ'MTED STATES PATENT OFFICE.

CHARLES THOMPSON, OF CORVALLIS, OREGON.

DRAG-SAW.

SPECIFICATION forming part of Letters Patent No. 271,159, dated January 23, 1883 Application filed August :26, 1882. (ModeL) '10 use the power of his weight on the treadles and of his hands on the hand-lever for working the saw in one direction, and the power of his weight on the seatlever and of his hands on the hand-lever for working the saw in the 1 reverse movement, thus enabling a greater exercise of power than is afforded by other machines; and the invention also consists of a contrivance of the seat for greater comfort of the operator, all as hereinafter fully described.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure 1 is a perspective view of my im- 2 proved sawing-machine, and Fig. 2 is a detail of the log-fastening devicein section.

For mounting the saw and the working-levers I employ a frame consisting of posts a and horizontal beams 11, together with a base,

c, or not, as preferred, the beams being attached at one end to the posts, and at the other end having an adjustable stay-post, d, and foot 6 for resting on and securing the log f y a g 9- The saw it has a rigidly-attached shank, i,

which is pivoted to the lower end of a working-lever, j, which has its fulcrum on a rod, is, mounted in the posts a at the top. This working-lever has the hand-lever l, pivoted to its .upper end, and said hand-lever has its fulcrum on the end of the bar m, which is pivoted to the frame at 0 to enable the fulcrum of the hand-lever to vibrate as the swing of the working-lever demands.

The seat-lever, which consists of the two parallel bars, 19, cross-bar q, and seat 9", is pivoted to the posts a at 8 below the fulcrum-rod k of the working-lever, with theseat projecting rearwardly from said posts suitably for 0 the operator sitting thereon to work the handlever, and also to work'foot-levers t, pivoted to the frame at a, and arranged with relation to the seat and the seat-levers, as shown, whereby the operator may apply his feet to the footpieces 2:, rigidly attached to levers t, said levers being connected to the seat-levers p by the rods 20 and the brackets w, and the seat-levers being connected to the working-leverj by the bar 3 and bracket 2, so that when the operator shifts his weight from the seatto the foot-leto vers he may also pull on the hand-lever, and thus apply both powers for pulling the saw back, and when transferring his weight to the seat he may at the same time push on the hand-levers, and thus employ both of these- 6 powers for thrusting the saw forward. The hand-lever working both ways, together with the seat-lever working one Way and the footlevers working the other way to impel the saw, thus enables two powers to apply to the saw each way, by which the operator may exercise a greater amount of force by a given amount of effort than with other arrangements.

I employ the parallel bars 1) and cross-bar q for the seat-lever in order to arrange the seat 7 5 between them for enabling the operator to work between them with more comfort than he can astride of a single lever, and I pivot the seat in said bars at a rather than attach it rigidly,

so that it can vibrate, and thus maintain the best relations to the operator for his comfort.

The leg 01 is adjustable vertically in the frame b, for; shifting it up and down to suit the height of thelog f, and is provided with a set-screw,

b, for securing it in position. 8

Braces b may be employed to connect posts a and beams b for increased strength, and the seat-bars 10 have a series of holes, of, in any opposite pair of which the seat-pivots a may be secured to adjust the leverage of the rock- 0 ing seat to suit the weight and strength of different operators.

Havingthus described my invention, Iclaim as new and desire to secure by Letters Patent- 1. In a sawing-machine, the saw it, with its 5 shank 6, connected to the lever j, secured to a shaft near its upper end, said shaft bearingin the supporting-frame, the hand-lever i, connected to the lever j, and the link or bar m, connectin g the hand lever l to the supporting- Ice 2 amuse frame, in combination with the seat-lever p q, having the hand-lever l, the link or bar m,conconnected to the leverj by the link '2 and the necting the lever l to the frame, the seat-lever foot-levers tv, suspended from the supportingp q, connected to the lever Zby the link 3 and frame and connected to the seat-lever by the thefoot-leverstv,suspended from the frame and 5 rods 20 w, substantially as and for the purpose connected to the seat-levers by the rods to w, 15 set forth. i. substantially as and for the purpose set forth. 7

2. In a sawing-machine, the combination of CHARLES THOMPSON.

the frame a b, having at its rear end the stay Witnesses: d, provided with the dog g, saw h, connected ROBERT JOHNSON,

IO to the leverj, pivoted in the said frame, and JOHN B. HORNER.

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