US427025A - Brake for cornice-machines - Google Patents

Description

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No. 427,025. Patented 999999999 0.

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J. WHITE.

BEAKE PCE CORNICE MACHINES. No. 427,025. Patented Apr. 29. 1890.

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JAMES VHITE, OF BROOKLYN, NEIV YORK, ASSIGNOR TO THE VULOAN COMPANY, OF NEY YORK.

BRAKE FOR CORNICE-MACHINES.

SPECIFICATION forming part of Letters Patent No. 427,025, dated April 29, 1890.

Application filed March Z7. 1889. Serial No. 305.020. (No model.)

To all whom it may concern:

Be it known that I, JAMES WHITE, a citizen of the United States, residing at. Brooklyn, Kings county, New York, have invented certain new and useful Improvements in Brakes for Cornice-Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to that class of cornice-presses provided with a clutch-pulley and a treadle arranged to connect the clutch vwith the mechanism for reciprocating the cross-head of the press. In such presses the momentum of the driving-gearing and the weight of the cross-head cause the machine to move for some time after t-he clutch is disengaged from the same; and the obj ect of the present improvement is to provide a friction-brake connected with the drivinggearing and with the treadle for actuating the clutch-pulley, so that the movement of the treadle when disengaging the clutch may throw the brake into operation and retard the movement of the machine automatically. To effect this result, the treadle, or one of the pieces connected therewith, is provided with a spring adapted to hold the clutch normally disengaged, and of sufficient power to throw the friction-brake into action, and the brake is thus operated Without any attention from the operator, who merely places his foot upon the treadle when it is desired to reciprocate the cross-head, and releases the treadle from pressure when the cross-head has made the desired movements.

The invention will be understood by reference to the annexed drawings, in which- Figure l is a rear elevationof a large cornice-press provided with the improvement; and Fig. 2 is an end elevation of one of the stanchions viewed from the inner side, with portions of the connected parts in section, on line in Fig. 1.

A A are the stanchions, and B the lower cross-beam supporting the lower die O.

D is the movable cross-head carrying the upper die F., and F is the crank shaft connected with the crosshead by links F to reciprocate the same. The shaftF is connected by gears G with a pulley shaft Il, provided adjacent to the stanchion A with a clutchpulley I. A treadle J is pivoted upon brackets secured to the ioor adjacent to the feet of the stanchions A and connected by a link K and bent lever or bell-crank L with the clutch-cone M. The depression of 'the treadle causes a corresponding movement of the lower end of the bent lever L by means of the link K, and thereby operates to force the cone toward the clutch -pulley I and to clutch the pulley to the shaft, as is common with clutchpulleys operated by levers, thus setting the crosshead D in motion. The removal of the operators foot from the treadle permits a spring N, attached to the treadle and to the stanchion, to lift the treadle and retract the cone from the pulley, thus disengaging the pulley from the shaft, after which the pulley will continue to rotate by means of a belt applied thereon, without driving the shaft.

To prevent the continued rotation of the shaft when theclutch is thus disengaged, a brake wheel or disk a is attached to the shaft near the stanchion A, and a wooden block b is held adjacent to the rim of the disk in a movable carrier c, operated by mechanism connected with the treadle J, so as to press upon the disk when the brake is actuated by the spring. The carrier c is formed as a square bar fitted in a socket d, having a cam e pivoted beneath it and provided with a leverarm p, which is linked to the treadle by a rod The cam is so shaped that the movement of the rod when the treadle is actuated by the spring rotates the highest part ofthe cam toward the carrier c and presses the block b upon the friction-disk. The cam obviously transmits the motion of the treadle to the block b with great force; but it is obviously immaterial .how the frictionblock be connected with the treadle, provided the movement of the treadle serves to press the block upon the friction-disk when the clutch-pulley is disengaged from the pulley-shaft.

By this invention the weight of the crosshead is prevented from rotating the crank,- shaft F when the cross-head is lifted and the weight is suspended from the crank-shaft in its highest position.

By the application of the friction-disk to the pulley-shaft H, which is the most quickly IOO rotating; shaft upon the machine, the motion of the machine is arrested in the most effective manner and in the shortest possible time, as a little movement ol' the pulley-shaft pro- (luces but a Veryslight rotation ot' the crankshaft or movement of the c1'osshead.` The block l) operates as a brake upon the disk a, and it is immaterial whether such block be used or some other form of brake be pressed upon the disk to arrest its movement. It will be understood that the disk a may be made of Wood, metal, or any other desirable material, and may consist in an iron pulley, the same as a belt-pulley, instead ol' a solid disk, as shown herein.

Hafvng thus set forth the nature and ad- Van tages of this invention, what is elai1nedis

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