US72828A - Philip estes - Google Patents

Description

`ence being had to the accompanying drawings, forming part of this speciieatiomin Which- @with laire @stmt-. ffies.

IMPROVEMENT IN HEAD-BLOCKS.

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TO LL WH-OM IT MAY CONCERN:

Be it known that I, PHIL'IP ESTES, of Leavenworth, in the county of Leavenworth, and Statevof'Kansus, have invented a new and useful Improvement in Saw-Mills; and I do hereby declare that the followingis a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the sume, refer.

Figure 1 is a, longitudinal vertical section of my improved head-bloek rack, takenl in the line z x, iig. 3. Figure 2 is a side view.

' Figure 3 is a'top View, l

v Similar letters of reference indicate corresponding parts.

This invention relates to an improvement in the construction of head-blocks for saw-mills, and consists in anopen rack and pinion, connectedwith a lever having clamping-eccentrics and .'tarrying four pawls, and a 'ratchet-wheel having two dogs, as hereinafter more particularly described.J

A represents the bearer of the head-block, in which, running down the middle on the top, is an open iaclc4 formed of the teeth a a. B is the knee of the head-block, fitted to a base to slide on the bearer A, ivhen moved by the pinion C, operated bythe lever D, which is forked to straddle the pinion and work on the samesha-ft, s. `The forked ends of the lever nre eceentrics b Z1, which are so formed that when the head-bl0ck is set to Athe gauge, and thelev'eriis thrown back close down to the rack, they bear upon the top of the bearer 'to clamp the knee, and hold it rigidly in place while the saw is cutting. Between the forks of the lever D are hung four -p1wls, e c c e, having one-inch pitch, operating on lthe pinion C, when the lever is raised, to push the knee B with the log forward. A ratchetwheel,.E, is set on one end of the shaft s, outside of the bearing, which has double the number of teeth of the pinion C, and is provided with two holding-dogs, d d, which allow the headblock to be set one-quarter of an ineh as cach falls, or more, as required. On one side-of the lever is a segmentgauge, e, on which is p'laced a stop-gauge, g, provided with a thumb-screw to adjust the movement of the lever for any thickness of lumber. When the log,` has been sawed up, the four pawls e c c c can all be thrown back from the pinion, and the whole head-block be pulled back at onhe without working the lever, or be taken oii the bearer entirely, t'o roll the log on from either side.- i l Having,` thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- 1..The lever D, provided with eccentrics Working on 'the shafts, upon each side of the pinion C, for clamping the knee B upon the bearer A, as herein shown and described. v

v 2. The combination of the open rack a, pinion C, knee B, forked lever D, pawls c, ratchet-wheel E, dogs eZ, segments e, and 'adjustable stop y, as herein described, for the purpose specified. A

The above specification of my invention signed by me, this l day of 1867.

PHILIP ESTES.

Witnesses:

Dn Fonnns'r FAIne'HILD, E. P. WILLsoN.

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