US355589A - Circular sawing machine - Google Patents

Description

(No Model.)

' E. S. COLLINS.

GIRGULAR SAWING MACHINE.

No. 355,589. Patented Jan. 4, 1887.

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U IT D STATES PATENT Orrion,

EVERELL S. COLLINS, OF NEBRASKA, PENNSYLVANIA.

CIRCULAR SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 355,589, dated January 4, 1887.

Application filed August 10, 1886. Serial No. 210,519. (No model.)

1'0 11% whom it may concern:

Be it known that I, EVERELL S. GoLLINs, of Nebraska, in the county of Forest and the State of Pennsylvania, have invented certain new and useful Improvements in Circular Sawing Machines, of which the following is a full, clear, and exact description.

The object of myinvention is to provide certain new and useful improvements in the circular sawing machine for which LettersPatent No. 344,568 were granted to me on the 29th day of June,-1886.

The invention consists of avertically-sliding rod actuating the mechanism for raising and elevation of my improvement.

In the Letters Patent above referred to the saw is raised and lowered by the operator actuating the treadle. In this present invention I raise and lower the saw automatically from the main driving-shaft, and I accomplish this by the devices now to be described.

The circular saw 0 is mounted in precisely the same manner as the one illustrated and de scribed in my former patent above referred to, and is operated from the vertically-sliding rod N,'which, however, is not actuated by a treadle, but by the device constituting my present invention.

On the rod N is pivotally hung the arm P, having forked arms 1? and P through which passes the shaft Q, carrying a pulley, Q, which is rotated by a belt, Q",'or other devices from the main driving-shaft. To the upright R of the saw-table S is pivoted the treadle T, provided with a roller or pulley, T, which operates against the upper edge of the arm P, and with a roller or pulley, T, which operates against the outer edge of the arm P. A weight, U, is hung on the inner end of the treadle T.

The bell-crank lever M is pivoted at M", and is provided with an angular slot, .M, through which passes a pin, N, secured to the rod N.

The lever M is also provided on its upper end rotary motion is imparted to the shaft Q from the main driving-shaft, and when the operator desires to move the vertical rod N downward, so as to swing the circular saw to its former position, he presses slightly with his foot on the'treadle T, whereby the rolleror pulley T,

acting on the arm P, forces the latter against the shaft Q, which rotates in the direction of the arrow a. The frictional contact between the rotating shaft Q and the arm P causes the arm Pto move downward, whereby'the vertical rod N also slides downward and elevates the saw 0 inthe manner and by the means described in my former patent. As soon as the operator releases the pressureon the treadle T the weight U, acting on the treadle, disengages the roller or pulley T from the arm P and causes the roller or pulley T to throw the arm P into frictional contact with the rotating shaft Q, so that the latter moves the arm P, and consequently the rod N, upward, and the circular saw 0 is returned to its position of rest below the saw-table G, as shown in the drawing.

Instead of using the weight U, a springmay be employed to accomplish the same purpose.

An arm or suitable projection is fastened to rod N and projects under treadle T near T, so that when the saw is lowered-and rod N at its fullest height the inner end of treadle T is raised enough to throw arm P out of 7 contact 0 with rotating shaft Q; or the arm P may be made so short as to just clear the shaft under above condition, thus accomplishing the desired result.

Having thus fully described my invention, I

claim as new and desire to secure byLetters Patent l. The! combination of a vertically-sliding rod operating a mechanism for raising and lowering the saw, with a forked arm pivoted on the said rod, a treadle operating on the said forked arm, and a rotating shaft actuating the said pivoted arm, substantially as rod N, operating the mechanism for raising shown and described. and lowering the saw, and the arm 1?, pivoted 2. The combination, with a rotary shaft, of on the said rod N and provided with the arms a vertiealiysliding rod, N, operatingthe mech- P and P, with the rotating shaft Q and the x5 5 anism for raising and lowering the saw, a treadle T, provided with the pins or rollers T forked arm pivoted on the said sliding rod, and Tiand the weight U,substantia11y asshown and means, as described, for throwing the arms and described.

of the said pivoted arm alternatelyin frictional EVERELL S. COLLINS. contact with the said rotating shaft, snbstan- Witnesses: ro tially as shown and described. GEORGE LEWIS,

3. The combination of the verticaliysliding J AMES GILFILLAN.

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