US74588A

US74588A - Improvement in head-blocks foe

Info

Publication number: US74588A
Authority: US
Publication date: 1868-02-18
Anticipated expiration: 1885-02-18

Description

@auch faire getest @frn Letters Patent No. 7,`588, dated February 18, 18.68.

IMPROVEMENT IN HEAD-BLOCKS FORLSAW-MILLS.

@ttt rlntule aferra tu tu its ,ilcitas ttmt mt mating mit rf the nina.v

TO ALL WHOM IT MAY-CONCERIT:`

Be it known that I, BENJAMIN P. PERRY, ofthe city of Richmond, county of Wayne, and State of Indiana, have invented a new and useful Improvement in Head-Blocks for Saw-Mills; and I do hereby declare that the following is' a full; clear, and exact description ofthe sameQreference being had to the accompanying drawings, making a part of this specioation, in which- Figure l isl a. perspective view.

Figure 2, a side elevation.

Figure 3, a longitudinal section.

,Figure 4, a transverse section'.

Figure 5, a view of a portion of the devices separate from the block.

The same letters in the dierent figures relate to correspon-ding parts of the invention.

To enable 'others skilledV in the art to make and use my invention, I will proceed to describe its construction and operation. Y

The block or structure is composed of the sides A and A', and ends D and D', and cap B, secured together in a substantial manner, with screws or otherwise. C represents a rack, having channelled sides t t', that slide on the inner edges of cap B. represents a pinion, for operating the rack, and K represents a ratchet, on same shaft with pinion I. a represents a sleeve, with journal-bcarings in the sides A and A', and is prov'idedwith an angular orifice, through which the square shaft b passes. N, X, and V are ears, attached to said sleeve, and

vona corresponding surface ofthe latter, in the spaces thus formed by the ears, are secured the ends of the pawls P and P', in the following manner: S and S' are rungs, having journal-bearings respectively in cars N and X and X and V, and are screw-tapped transversely, into which are screwed the ends of the pawls,vthe latter lbeing provided with suitable thread for that purpose. M represents an elliptical disk, attached to the thimble g, which latter is inserted through the side A' of the block, having attached to its outer end-the lever e, by which said elliptic is operated. The shaft J, to which pinion I and ratchet K are connected, has a hearing of the end, r, in the cavity of thimble g, the`.`other end of said shaft having a bearing in the side A of the block. The springs y and y' serve to keep the pawls to their places onthe ratchet.' The ends of said pawls that `engage with the ratchet are wider than the latter, and extend over the elliptic, M. The pawls P and P' are operated by lever nl, and move simultaneously in the same directionfin consequence of their both being connected with the sleeve a, on the same side of the latter, 4thus making each stroke of the hand-leverl operative, resulting in almost a continuous Vmotion-of thc feed. l-I represents a collet on the end of shaft b, having .a projection or stop, 7L, which latter (as the shaft is operated by lever d) strikes alternately the ecccntri'cs n and n', the object of which is to regulate Athe throw of the pawls, and thus, by changing the eccentrics with their longest ior shortest radius to the stop 7i, the feedis adjusted. The aforesaid eccentrics areA secured to the side ofthe blocks by screws, or in any convenient manner for changing their position. -The longest diameter of the elliptic, M, is greater than the diameter of the ratchet K, by which means, as the said elliptic is turned, with'its ends in a vertical position, the pawls are thrown out of gear with ratchet K, which permits rack C to be moved freely back and forth. l

In the operation of sawing, the ends ot'i the log rest on `thc blocks, and against tbe vertical end-'Gr of the rack, where it is held by means of a dog attached to the rack, and which is Vmade to clasp said log, thus preventing the latter from rolling while being Vfed to .the saw.

Having ,thus fully described my said invention, what I claim, and v-desirc to secure by Letters Patent, is-

1. I claim connecting the pawls P and I" with the sleeve a on the same side of the latter, by which a simultaneous action nf said pawls is produced, Vresulting in the alternate operation on the ratchet, substantially as set forth. Y

2. I claim the collet H, having the projection h, in combination with the cccentri/cs n and n', for adjusting the feed, substantially as set forth.'

` BENJAMIN P. PERRY.

Witnesses :v

JOSEPH RIDGE, WM. R. WEBSTER.