US291277A - Drag-saw - Google Patents

Description

W. A; BENNETT.

' DRAGYSAW.

Patented J.an.. 1; 1884.

, 7 INVENTOR:

BY .uMM/ww ATTORNEYS.

u Finns. munm h-n Washington. n. a

the front posts, 0 c,

- siren ST-A f IVILLIAM A.BENNETT, OF DALLAS, TEXAS.

DRAG- SAW.

SIPECIFICATION forming part of Letters Patent No. 291,277, dated January 1, 1884.

Application filed September 10, 18E3. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM A. BENNETT, of Dallas, in the county of Dallas and State of Texas, have invented a new and Improved Sawing-Machine, of which the following is a full, clear, and exact description.

The object of my invention is to provide a simple, inexpensive, durable, and easily-operated machine for cross-cutting timber for railway-ties and material, or for cord-wood, stove-wood, or other uses.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corits lower pointed end or toe and by responding parts in all the figures.

Figure l is a side elevation of my improved sawing-machine. Fig. 2 is a sectional plan 'view, and Fig. 3 is an end elevation thereof.

I make a light but strong frame of sills, a, rear posts, 12, tied together at the top by the cross-bar or plate, I), and front posts, 0, spaced apart at the top by abracket-block, c, and tied to the crossbar b by the longitudinal bar cl. The posts -11 c are suitably framed or boxed into the sills a, and may be further braced therefrom or from each other, as may be desired.

In bearings e, fixed to posts I), I journal the primary driving-shaft f, which has any ap proved hand-wheel or crank, f, and a fixed main driving gearwheel, g, which meshes with the pinion h, fixed on a shaft, i, which is journaled in bearings t on posts I), and carries at one end the balance-wheel j, and at the other end the crank-disk k,by a wrist-pin, in which disk the saw-driving pitman Z has a pivotal connection at Z, and at the front end said pitman is bent inward nearly to the space between posts a c, and then forward, and finally connects by a pivot-joint at l with the sawcarrying rod 121., to which I rigidly connect the saw a by any approved tongue and groove or other suitable joint and bolt, as at n.

The letter 0 represents a bar or rod, which is pivot-jointed to one or both rear-posts, b. as at 0, and extends forward between and beyond by which latter posts bar 0 is held so as to have free vertical play, but no lateral movement. The saw-carrying rod m carries one or more fixed eye-bars or yokeplates, m, which are apertured to fit loosely I upon the forward end of bar 0, so as to slide l thereon for a guide to the saw as the saw is operated. A bar or pawl, 19, pivoted at p at any convenient point at the head of the sawframepreferably to the bar dengages by gravity with a rack, q, formed on or fixed to bar o,for holding the saw a down to its work as it cuts through the log. A spring, r, is fixed to the frame at r, and below to the bar o,for the purpose of balancing the weight of the bar 0, saw a, and its connections at Z, these parts Zm n 0 rising and falling together; and in practice the tension of spring 1' will be regulated so as to sustain the saw at about its lowermost position, the object being to relieve the cutting edge or teeth of the saw of excessive weight and avoid an undue crowding of the saw, and thereby facilitate its free and easy cutting action.

To more conveniently move the machine from place to place, I provide on pawl-bar p a hook, s,to engage an eye, 8', on the frame, to hold the bar 19 raised, and a hook, t, 011 bar 0, for engaging an eye, If, above,to hold the parts Z m n o in a fixed raised position, thereby relieving the spring 1* of strain, and avoiding damage to the saw.

In operation the machine will be placed to bring the sawn above a log or timber, a, at any desired point of its length, when the fastenings at will be released and the saw will rest on the timber, and the pawl-bar 19 will fall into engagement with one of the rear teeth of the rack q. The handle f will now be rotated to rapidly reciprocate the saw by the gearing and connections above described. As the cut through the log deepens, the toe. of the pawlbar p drops forward into successive teeth of the rack q, and prevents all rising or jumping of the saw while at work. thereby insuring a smooth,steady out without excessive strain or wear of the saw and its connected parts.

Two or more holes for wrist-pins Z may be provided at varying distances from the center of crank-disk 70, for changing the length of stroke of the saw at will, as may be required for heavy or light timber.

My improved machine may be built cheaply in various sizes, may be safely worked by unskilled labor, and by its use time may be economized and better work assured.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The saw-carrier mand pitman l, jointed together at Z in combination with a rod, 0, pivoted to rear posts, I), passing through yokeplates m on the smwcai'rier, and laterally secured against posts 0 0, whereby the saw may be prevented from a lateral movement-,bnt permitted a free downward movement, as described.

2. The combination, with the pit'oted bar 0, having a rack thereon and connected with the saw-carrier by yoke-plates m, of the pawl p, pivoted at whereby the saw may be held down to its work, as described.

The combination, with a pivoted sawcarrier, of the pivoted rack-bar 0, connected therewith by yoke-plates m, and the spiral spring 1, the latter attached to said rack-bar and to the upper part of the frame, as shown and described.

4. The combination, in a sawingnmchine, of the saw-frame, shafts f 2", balance-wheel j, crank-disk 7r, pitman I, saw-rod m, having gnideeyes on, pivoted bar 0, having rack q, the gravity-pawl p, and the balancing-spring 9', substantially as shown and described.

WILLIAM A. BENNETT.

Witnesses:

FRED \VILLIAM C. 'KITTs.

Images