US63340A - Improvement in saw-mills - Google Patents

Description

@uitrit gisten gatrut @fitta JAMES TRACY, 0F BREWERS VILLAGE, MAINE.

Letters Patent lVo. 63,340, dated lfm-eh 26, 1867.

MPROVEMENT IN SAW-MILLS.

TO ALL WHOM IT MAY GONCERN:

Be it known that I, JAMES TRACY, of Brewer's Village, in the county of Penobscot, and State of'Maine, have invented a new and improved Machine for Hoisting and Canting Lumberlin a Saw-Mill; and I do hereby declare that the following is aiull, 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 oi' this specification, in which Figure l is a cross-section of au edging-saw frame showing the arrangement ofY my improved 'h/oisting machinery.

Figure 2 is a side view of the same.

Similar letters ofrei'erenceindicate like parts. y

This invention relates to improvements in machinery to be connected with a gang-saw mill7 for canting and hoisting the timber after it has been cut into plank upon the table of a circular saw for edging the plank. This operation is usually performed by hand, by several men, with 'great labor, whereas by the application of my improved machinery the manual labor is saved and the operation is performed with great dispatch.

A A rep-resent the frame of a `ciwrular-saw mill for edging plank connected with a gang-saw mill; C is the circular saw, and D the table; E is the stock or lumber, after having been sawed in the gang-saw mill, which is to be edged by the circular saw. The lumber has to b'e lifted upon the table D for the purpose of edging or squaring the edges oi" the plank, and this operation is readily accomplished by the hoisting apparatus as follows: F is a drivingpulley which is connected with the machinery of the saw-mill to give it motion, and is placed at any convenient point, from which pulley passes a belt, a, to a small pulley, I1, on the end of a shaft, c, hung in a frame, d. On thevshaft e, within the frame d, is placed a friction-pulley, eovcr which is hung a smaller friction pulley,'7z, on a shaft, m, which carries at the opposite end a pinion, n., that engages in the spur-wheel n', on the shaft of which is the drum p, for winding the chain r that passes over the pulleys s s', above the edgingtable, and falling centrally over the stock or lumber E, also passes through a single block and sheath t' attached to the timber-hooks g. One end of the shaft m passes through a slot on the side of the frame cl next the frictionpulley L, and is hung in thc short arm of a lever, fc, the long arm of which extends back under the Hoor Gr of the saw-mill, on which the lumber E is lying; and the cud of the lever projects above the licor or is placed in SOmc convenient` position for the workman to place his foot upon it to depress it and operate the hoisting machinery. lThe shorter arm of4 the lever is turned downward and inv/ard, and to it is secured the shaft m bea-ring the friction-pulley it. A spring, 7c', is secured to the frame near the pivot of the lever 7c, and bearsoagainst the'inner side of its longer arm. New when it is desired to raise the stock or lumber upon the edging-tahlc D, the timber-hooks g are placed about centrally on the part to be edged, one man being stationed at each end of the lumber, when the man at the head nearest the circularsaw puts his foot on the end ofthe lever 7c and presses it slightly, which throws the small friction-pulley t against the larger friction-pulley e, the motion of which is Constant, and thus itreceives rotation, carrying with it the pinion n on the samevshaft m, turning the drump by thc spur-wheel n', and winding on it the chain r, which passes over the pulleys s s, thus hoisting the lumber over the table to be swung into place by theworkmen; the head mans foot being removed from the lever 7c, the hoisting apparatus is thrown out of gear. 'By the 'same operation the lumber can be canted orithe lower part of the stock turned over and laid with the widest side down upon theedging-table, by attaching the hoistingclamp to chain-dogs properly adjusted.

Having described the construction of' my invention, and its operation, I claim new- Applying the spring It to bent-lever K, for the purpose of throwing thefriction-pulleys out of contact, suhstantially as described.

JAMES TRACY. Witnesses:

Joan H. Kann, JointT F. NOURSE.

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