USRE6777E - Improvement in log-turners for saw-mills - Google Patents

Description

BEST AVAILABLE C SHEARER.

LOG-TURNERS FOR SAW MILLS.

Reissued Nov.

N. PLTERS PHOTOLITHQGRAPHER. WASMXNGTON. u

UNTETED STATES PATENT OFFICE.

GEORGE E. SHEARER, OF BAY OIIY, MICHIGAN.

IMPROVEMENT IN LOG-TURNERS FOR SAW-MILLS.

Specification forming part of Letters Patent No. 147,181, dated February 3, 1874; reissue No. 6,773, dated November 30, 1875; application filed April 28, 1874.

T 0 all whom it may concern:

Be it known that I, GEORGE H. SHEARER, of Bay City, in the county of Bay and State of Michigan, have in ve ited an Improvement in Log-Turners for SaW-iIilis, of which the following is a specification:

This invention relates to an improvement in that class of devices for turning logs on sawcai'riages, wherein a spiked bar is projected up past the edge of the carriage by mechanism below the floor to turn the log; and the invention therein consists in the combination of the operative devices connected with the spiked bar, and in the combination of a frictior wheel with a stationary brake, all as more full hereinafter set forth.

Figure 1 is a plan view of a portion of the mill-floor, carriage, and skids. Fig. 2 is a cross-section at a; w, and Fig. 3 is a longitudinal vertical section at y 3 of Fig. 1.

In the drawing, A represents a part of the frame-work of themill-house; B, the millfioor, and O the log-carriage. D D are the skids, on which the logs are placed preparatory to their transfer to the carriage for sawing. E is a spiked bar, playing through a slot in the mill-floor close to the edge of the carriage. To its lower end are bolted two L- shapedplates, E, having journaled at their projecting ends a pulley, a. F is a shaft journaled in hearings in the lower part of the mill-frame, transversely to the direction of the movement of the saw-carriage, and is continuously rotated from any convenient source of power. G is a friction-wheel keyed on the shaft F. In a post, H, which supports the foot of the bar E when it is down, is journaled a shaft, I, whose other end has a bearing in a lever, J, pivoted at b to a post in the millframe. K is a friction-wheel, keyed on the shaft I, and behind it a stationary brake, L, is erected on the ground-floor. M is a lever, pivoted in a slot in the mill-floor, above which its upper end projects. A rod, N, connects the lower end of the hand-lever M to the top of the lever J. 0 is a cord, having one end attached to a beam under the mill-floor, being led from thence down around the pulley a in the angular foot of the spike'bar; thence up arounda pulley, a, suspended from the same beam thence down, and attached to t -l 1 e shat 't I. Two radius-rods, P P, are pivoted to the sides of the post to which the lever I is pivoted, their other ends embracing and pivoted to the heel of the spike-bar.

To turn a log on the carriage, the sawyer moves the lever M to the left, which gives the shaft I a slight movement, bringing its friction-wheel K into contact with the running friction-wheel Gr, causing the shaft I to rotate andwind up the rope 0 on it, drawing up the spike-bar, the strain upon which being at the end of its angular heel, tilts it at the top toward the log, while the radius-rods move the foot toward the log as it rises, causing the spiked face of the bar to be forcibly pressed toward the log, preventing any tendency to slip on it while turning it. WVhen' the log is turned to the desired position, to hold it in that position while being dogged fast, the sawyer quickly moves the lever M to the right forcibly pressing the back part of the rim of the friction-wheel K against the stationary brake L, which prevents the spiked bar from falling down of its own weight until pressure is released from the lever M.

To prevent the logs on the skids from rolling toward the carriage and interfering with the working of the log-turning device, I journal a shaft, Q, through the skids, and turn a crank on each end. On this shaft, near the outer side of each skid, I secure-an eccentric, R, on which rests the short arm of an L-shaped bar, S, pivoted at the other extremity to the skid side. By means of the eccentrics these bars S maybe raised at their angles above the planes of the skids, and presentthe inclined planes to the advance of the logs roll.- ing on the skids, which would roll. or jump over them except for the provision which I make against such contingency byforging a wrist on each bar at the heel of its angle, on which I sleeve a roller, e, which projects a little above the bar. As soon as the log strikes these rollers it rotates on its axis, and rolls back down the incline planes until wanted on the carriage, when a partial rotation of the eccentrics brings the rollers below the plane of-the skids, and allows the log to roll onto the carriage.

In lieu of the eccentrics, cranks may. be em- ,rl reeiiqle an 1.9881 the chec What I claim as my invention, and desire to-secure by Letters Patent, is- I 1. In combination, the toothed bar E, with an angular foot, the radius-bars P P, pivoted to the angle of the foot, and the pulley a at the end of the foot, for the purpose of simultaneously raising and tilting the toothed bar, substantially as described. 2. In combination, the shaft Q, the eccentric R, the L-shaped bar S, and roller z, for, 1 the purpose of preventing the log from rolling toward the carriage, substantially as described.

3. In log-turning devices, the combination, with the wheel K, of the stationary brake L, substantially as and for the purpose specified.

4. The qombination, with the spiked bar E, of the radius -bars P, shafts F I, frictionwheels G K, levers J M, brake L, cord or chain 0, pulleys a e, constructed and arranged to operate substantially as described, and for the purposes set forth.

- GEORGE E. SHEARER.

Witnesses T. V. Ammnws,

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