US70950A

US70950A - Charles h

Info

Publication number: US70950A
Authority: US
Publication date: 1867-11-19
Anticipated expiration: 1884-11-19

Description

'taitrb gisten utat @frn IMPROVEMENT IN HEAD-BLOCKS FOR SAW-MILLS.

dita 5:12am tramuta it there Estas @stmt mit mating part uf its tame.

TO ALL WHOM IT MAY CONCERN: l

Be it known that I, CHARLES H. BROOKBANK, of Connersville, in the county of Fayette, and State of Indiuna, have invented a new and improved HeadfBlock for Saw-Mills and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art .to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 represents a rear. elevation of my invention. v

Figure 2 is a plan or top view of the same.

l Figure 3 is a. detail sectional view of the same on an enlarged lscale, the plane of section being indicated by the line x x, fig. 2. I

Figure 4 is a detail sectionalwiew of 'the same, the plane of section being indicated by the line y y, iig. 2.

Similar letters of reference indicate like parts. 4

This invention relates toa device by which head-blocks can be moved on a saw-carriage of suitable construction, so that a log can be` set Vthereby to the saw after a board has been sawed off; which device can be regulated to feed the log any -required distance for cuttingboards of any desired thickness.

The invention consists in the construction and arrangement of the parts by which the screw-shafts, on which the head-blocks slide, are operated, so that they are only revolved in one direction while the log is to he fed, being handled by a vertical lever, the lower end of which is pivoted to the carriage, while its upper portion is connected with a horizontal sliding-bar. A rack secured to the latter ts into the teeth of a pinion, which is hung so as to turn loose on the aforesaid screw-shaft, and which is connected with the same by a pawl and ratchet-wheel, whereby, asthe pinion is revolved by the motion of the sliding bar, ythe screw-shaft is carried'v around in one direction, and the head-block is moved forward, while, when the pinion is revolved in the opposite direction during and by the return move of the aforesaid sliding bar, it will turn loose onthe shaft. When the blocks are to be set back for a. new log, the screw-shafts have to be turned by hand. The length of stroke allowed for the lever and sliding bar regulates the distance for each move of the blocks, and consequently the thickness of board sawed. Y

A represents a saw-carriage for a circular saw. It is made of any suitable material and form, and is operated by any suitable device. B B are two or more beams, which are arranged on top of the carriage, extending across the same, their upper surfaces acting as rests for the log. These beams are made hollow, and are firmly secured to the carriage by means of screws, or other suitable devices. Within each beam is arranged a horizontal shaft, C, which extends from end to end of each beam, and has its bcaringslin the ends of the beam. Between the ends of the beam each shaft C is provided with a single or double screwthread, as shown. D D are the head-blocks, which slide upon the beams, and have each a downward extension which passes through a slot in.

the upper face of the hollow beam, and which encloses the screw C, acting as a nut on the same. Thus, as the screw C is turned in either one or the other direction, the block which is connected with it is either moved forward or backward, as may be desired. To the rear end of each beam is secured an arm, la, which forms the support for a horizontal sliding rod, E, which is arranged in rear of the carriage, parallel with the track ofthe carriage, and at right angles with-the beams. To this rod are secured adjustable slides n n, which are toothed on their under sides, as shown, and which mesh into pinions b, of which one is hung loose on the rear end of each shaft C. On the outside of each pinion b is formed a ratchet-wheel, c, (see figs 3 and 4,) which moves with the pinion. d is a. wheel,'which is mounted on the extreme rear end ofthe shaft C, and revolves with the same. A pawl, e, is pivoted to its inner side, and is forced upon the ratchet-wheel c by a spring,f.

As the bar E is moved in the direction of the arrow 1, in iig. I, its teeth mesh into the pinion, and the latter will be turned in the direction of the arrow 2. The teeth on the ratchet will then catch against the end of the pawl, and the pinion will thus carry the wheel d around with it, and consequently the shaft G, 'as the wheel d is firmly keyed on the shaft. The screw on the shaft will operate the headblocks, and will move the same forward. When the bar E is moved in the opposite direction, the pawl will slip on the ratchet-wheel, and the shaft C will not lie-turned. The rod E is secured to a bar, G, which is pivoted to a. lever, F, the latter being pivoted to the' carriage, as shown in g. 1. By means of this lever the rod E is moved in the direction of the arrowl when ever a board has been sawcd ci?, and the log will then be set to the saw again. The bar gvisisecured to a sliding sleeve, IL, on the bar E, said sleeve being held in position by a set-screw, z', as shown. The stroke of the lever F is regulated by means of two pins 7c 1c, which are arranged. in the carriage. By increasing the distance between these pins the lever is allowed to make a longer stroke, and the head-blocks are thereby moved a. greater distance during each stroke. By means of the set-screw z' and sleeve 71. the length of stroke of the bar E can he increased or diminished without increasing or diminishing the stroke of the lever F. When a log has been cut up, and the head-blocks are to be drawn back, each screw-shaft C must be turned for the purpose. The wheels d re therefore each provided with a handle, Z, by which the shaft can be turned. This handle is a continuation of the pin by which the pnwl is pivoted to the wheel d, and thus by turning the handle the pawl can he thrown out of the ratchet-wheel and the sha-ft C returned, so that the head-blocks are drawn back from the saw. m m are the dogs, which are pivoted to the head-blocks, and by which the log is secured to the blocks. l I am aware that Letters Patent were granted to J. H. Clemens, bearing date April 9, 1867, for improvements in head-blocks for saw-mills, but the subject-matter of this I do not claim` as it forms no part of my invention; but

What I claim as new, and desire to secure by Letters Patent, is 1. The rod E, provided with the adjustable toothed slides n, and operated by means of the lever F pivoted to the carriage, and connected to said rod by means ofthe sliding sleeve h and bar g, all arranged as described for the purpose specified.

2. The pins 7c 7c and sliding sleeve h, regulating the stroke of the lever F, whereby the movement of the head-block is determined, as herein shown and described.

3. The pinion b, having formed upon its inner side the ratchet-wheel c, turning loosely upon the screwshaft C, and connected to the wheel d by the pawl e and springf, as .herein described, and operated to move the head-block forward by the ratchet-bar E, and to withdraiv said head-block by means of the crank l independent of the ratchet-rod, all arranged as described for the purpose specified.`

4. The arrangement of the pivoted lever F, connected by the bar g and slide h to the ratchet-rod E, the screwrod C, pinion b, ratchet e, crank-wheel d, pawl g, springf, and head-block D, as herein set forth for the purpose specified.

5. Feeding the log to the saw the required distance at one stroke of the lever F, through the medium ofl the retehet-bar E, pinion 11, ratchet c, wheel d, and screw-rod C, as herein shown and described.

CHARLES H. BROOKBANK., Witnesses:

Josnrn G. Gnorr, SAM. H. BECK, JAKE KLUM.