No. 652,402. Patented lune 26, |900.'
(Application led Feb. 17, 1899.) (N 0 M o d el Wdnedded' Imp" TH: Noam: versus oo, Hora-uwe.. mswwnTcN, n c` WALTER PASCHALL, OF ADAMSFORD, PENNSYLVANIA.
SPECIFICATION forming part of Letters Patent No. 652,402, dated Julie 26, 1900. Application tiled February 17, 1899. Serial No. 705,805. (No model.)
To all ltr/71,0771, it may concern,.-
l B e it known that I, WALTER PAscnALL, of Adamsford, Delaware county, Pennsylvania, have invented an Improvement in Hoisting- Machines, of which the following is a specification. y
My invention has reference to l1oisting-ma chines; and it consists of certain improvements which are fully set forth in the following specification and shown in the accompanyin g drawing, which forms a part thereof.
In hoisting machinery such as employed around building operations for elevating or lowering material or elevator -cages it has been customary to provide the winding-drum with a suitable mechanical or friction brake. Furthermore, this brake has been ordinarily applied by hand-power. l
In my present improvement I provide the hoisting apparatus with suitable automatic brake applying devices so arranged that when the apparatus is left to itself the brake is applied and the winding-drum held against rotation. My improvement-s comprehend, further, the shutting off of the steam or other source of energy automatically from the engine or other suitable motor when the brake is applied.
In carrying out my invention I provide the windingdrum with a suitable mechanical friction-brake and power-applying devices for tightening said brake automatically. Preferably such device operates by gravity or its equivalent, such as a heavy spring. Combined with such brake-applying devices I arrange a platform or support or foot-rest for the operator, whereby his weight may be applied thereto, andthus cause the brake-applying devices to be so moved or shifted as to remove the brake-pressure. I also provide controlling devices for the motive power operated by the same mechanism and adapted to put the hoisting apparatus into operation when the operator stands upon or depresses the platform or support or moves it in removing the brake and throws it out of operation when he leaves said platform or support free. The advantage of this will be readily seen when we consider that there may be numerous causes which suddenly remove the watchful care `of the operator or necessitate his presence suddenly away from the hoisting- `reference to the accompanying drawing, in
which is shown an elevation of a suitable hoist-ing apparatus embodying my improvements.
' A is the winding-drum of any suitable construction and is operated by an engine or engines through suitable gearing in any of the well-known manners. The motive power,
while ordinarily steam and supplied to the engines bya steam-pipe P and a hand-valve N, may, nevertheless, be any other of the wellknownY motive powers, such as an electric motor with the ordinary control-switch, it be ing immaterial to my present invention what the particular motive power for operatin g the winding-drum may be. The winding-drum A may be provided with a brake-flange C, about which a suitable brake-band D is placed. This brake band isv operated so as to be tightened or loosened by a lever e, secured to a rock-'shaft E, which is rocked by an arm F.
G is a pivoted lever or frame pivoted at I to the main frame of the hoist and is heavily counterweighted at K on one end and provided with a platform l-I or foot-rest at the other end. This lever G is connected at the free end of the arm F by a link J. It will now be observed that in the position shown in the drawing the counterweight K is exerting a power upon the brake-band to arrest the rotation of the drum A. If, however, the operator stands or presses upon the platform or foot-rest II, the counterweight is overcome and the brake is removed. If the operator should by sudden illness or by accident be stricken down, so as to be incapable of controlling the hoist, his falling off or away from the platform or foot-rest will arrest the operation in the hoist by applying the brake. It is evident that the counterweight may be in conjunction with or substituted by other meansas, for example, a spring, as indicated at K. `This advantage is carried furn IOO ther by connecting the movable lever G with athrottle-valveLin the steam-pipe P through a suitable link M, so that simultaneously with the automatic application of the brake the throttle-valve will be operated to shut o the supply of steamV or other motive agency. The throttle-Valve L is not intended to control the speed of operation of the hoisting apparatus, as that is governed by a suitable handvalve N, controlled directly or indirectly by the operator, but it isintended to absolutely arrest the application of motive power to the hoisting devices. This same result would be accomplished with any character of powersupplying devices, for if B were intended to represent an electric motor, P the line conductor to it, N the speed-controlling switch, and L an ordinary well-known circuit-breaking switch it is evident that the same operation of the hoisting apparatus as a whole would result. I therefore do not confine myself to any motive power.
I do not limit myself to the minor details of construction herein set out, as they may be varied or modified to suit the different designs of hoisting apparatus to which my invention may be applied without changing or altering the spirit of the invention.
What I claim as new, and desire to secure by Letters Patent, is-
1. In a hoisting apparatus, the combination of the hoisting-drum in fixed bearings, power devices for operating it, a friction-brake, a power-actuated device for applying the brake by moving it under normal conditions and an operators support or platform whereby the Weight of the operator standing on said platform is required to remove the brake and hold it out of action.
2. In a hoisting apparatus, the combination of the hoisting-drum supported in fixed bear# ings, power devices for operating it, permanently in gear therewith, a friction-brake, a power-actuated device for positively moving the brake under normal conditions to apply it` and an operators support or platform whereby the weight of or direct application of power by the operator standing on said platform is required to remove the brake and hold it out of action, and controlling means for the power devices whereby said power devices have their motion automatically arrested simultaneously with the application of the brake.
3. The combination of a winding-drum j ournaled in fixed bearings, a movable frictionbrake therefor, a rock shaft and lever for applying said brake, a pivoted lever G counterweighted at one end, a platform or support for the operator at the other end, a connection between the lever mechanism for applying the brake and the lever G whereby the counter;y
weight applies the brake and elevates the operators platform and the weight of or direct application of power downward upon the platform by the operator removes the brake, a motive-power device to operate the windingdrum, a controlling device to control the op-v eration of the engine, and a connection be; tween said controlling device and the lever G or one of its connecting parts, whereby the power is automatically shut off from the engine when the brake is applied and vice versa.
In testimony of which invention I have hereunto set my hand.
E. M HNTER, J. W. KENwoR'rHY.