US320022A - Hoisting-drum for elevators - Google Patents

Description

2 Sheets-Sheet 1. P. L. WEIMEIL HOISTING DRUM FOR ELEVATORS.

Patented June 16, 1885.

W W E /V 706 ,4 B y Afforneyg n. PEIEHS. Photo-Lithugnphnr, Wnhinglon, n1.

0 m J. H T. m 7 -I "all;

(N0 ModeL) (No Model.) 2 Sheets-Sheet 2.

P. L. WEIMER. HOISTING DRUM FORELEVATORS. N0. 320,022. Patented June 16, 1885.

N. PETERS. Pnmmm m ner, Wnhi a c.

UNITED STATES PATENT OFFICE.

PETER L. WEIMER, or LEBANON, PENNSYLVANIA.

HOlSTlNG-DRUM FOR ELEVATORS.

YJEEC IFICATION forming part of Letters Patent No. 320,022, dated June 16, 1885.

Application filed May 12, 1885, (No model.)

To all whom it may concern.-

Be it known that I, PETER L. WEIMER, a citizen of the United States, residing at Lebanon, in the county of Lebanon and State of Pennsylvania, have invented certain new and useful Improvements in Hoisting-Drums for Elevators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In the operation of hoisting engines much difficulty has been experienced in endeavoring to provide frictional devices which will securely lock the drum and the shaft together and hold them against the possibility of slip: ping or breaking away and allowing the load to fall, which often results in accidents attended with great loss of property, and in inany instances resulting in personal injury, and not infrequently in the loss of life.

My invention has for its object the construction of a hoisting mechanism having a positive and certain frictional action, so constructed and operating with relation to the interior walls of the hoisting-drum and the shaft upon which it revolves that its velocity or speed is controlled with ease and facility when lowering the elevator or load, and also enabling the operator to securely and rigidly lock the drum and the shaft together when hoisting the elevator and its load, all of which I accomplish by means of the combination of the devices, which will hereinafter more fully and at large appear.

In the accompanying drawings, which form a part of this specification, Figure 1 is a verticallongitudinal section of the hoisting-drum, its master-wheel, and frictional mechanism. Fig. 2 is a vertical and transverse section of the same at line 3/ y. Fig. 3is a sectional view in perspective of the shaft.

Reference being had to the drawings, in which similar letters'refer to corresponding parts, A represents the drum bolted to heads B O, which are mounted upon a shaft, D,which is enlarged at E and provided with a transverse rectangular opening, F, having inwardly-projecting flanges G G, provided with recesses for the reception of projections on the adjacent boX carrying the brake-shoe. G G are bars bolted to the inner sides of the rectangular opening aud extending the entire length thereof, and are provided with recesses to receive the projections on the box adjacent thereto. The flanges G G and the bars G G form a guide for the sliding bar H, which is provided with recesses I, for the reception of the inner ends of links J, which are pivoted to the bar, their outer ends being pivoted in like manner in recesses L, formed in the pro jections on the boxes K. The boxes K are provided with dovetailed cavities for the reception of wooden brakeshoes M, which should be so constructed that the end grain of the wood will bear against the inner smooth wall of the drum A, which has been bored out. The shaft D revolves in suitable bearings, N, and the heads B O of the drum revolve upon the shaft D. The head 0 is provided with an annular flange, O, projecting outwardly toward the master-wheel P, which is rigidly secured to the shaft D. In the shaft is a longitudinal cylindrical opening, in which is inserted a rod, Q, which is attached to the bar H by a screw on its inner end and a pin, V. The opening for the reception of the rod Q is enlarged or counter-bored at the outer end for the reception of a sleeve screw-nut, S, which has at its inner end an outwardly-proj ecting flange. Over the sleeve screw-nut are placed frictionrings U,which rest against the shoulder formed by the projecting flange of the screw-nut, and are held in place bya screw-threaded follower, R, within which follower revolves the cylindrical screw-nut S, which is held in the enlargement of the bore of the shaft by said follower. On the outer end of the cylindrical screw-nut S is secured a hand-wheel or crank, T, for revolving the nut S. The screw-nut is adapted to screw-threads on the outer end of the rod Q, so that by the revolving of the nut in one direction,by means of the hand wheel or crank, the rod Q will be moved toward the head 0, thereby forcing the brake-shoes against the inner wall of the drum A,th rough the medium of the bar H and links J. By turning the screw-nut S in the opposite direction the rod Q will draw the bar H back, which, through the medium of the bars J, will release the brake-shoes. It will be observed that a very slight movement of the bar H through the medium of the rod Q, the nut S, and the hand wheel or crank 'I will apply or release the ICO brakeshoes M, and that any movement of said brake-shoes is subject to the will of the operator, who may apply the shoes with sufficient force to lock the drum and the shaft securely together to provide for the winding of the rope or cable to hoist the elevator. NVhen it is desired to lower the elevator-car, the operator adjusts the pressure of the frictional surfaces, so that steam may be cut off entirely from the engine, and the speed of the elevator-car in its descent is completely under his control and is effected entirely by gravity.

One of the important advantages of my improvement is that the frictional surfaces can be brought into contact under such pressure as to completely lock the drum and the shaft, so that the former cannot slip,'and that the same device which looked the drum and shaft, may be applied so lightly as to regulate the speed of the descending elevator-car.

In another application of even date of filing I have claimed the specific construction of the means contained in the outer end of' the shaft for applying and releasing the frictional surfaces.

Having thus fully described my invention, what I claim is l. The combination of a hoisting-drum, a shaft provided with an enlargement within the drum, a friction-brake carried by the shaft Within the enlargement, and suitable means for applying the brake to the inner walls of the drum, substantially as described.

2. The combination, with a hoisting-drum having a smooth inner wall, of friction-brake shoes supported by the shaft and extending nearly throughout the entire length of the drum, and means, substantially as shown,

wvhcrebythe drum and the shaft can be securely locked together for hoisting, and the velocity of the revolving drum controlled for lowering.

3. The combination, of a hoistingdrum loosely mounted upon a shaft provided with an enlargementjwithin the drum, a frictionbrake contained within the enlargement, a sliding bar, links connectedto the bar, and the boxes containing the brake-shoes, and suitable means for applying the brake to the drum and releasing it therefrom, substantially as described. v y

4. The combination, with a hoisting-drum revolving upon a shaft provided with a rectangular opening within the drum and carrying a friction-brake, of means,substantiallyas shown, revolving with the shaft for applyin and releasing the frictional surfaces.

5. The combination, with a hoistingdrum mounted upon a shaft having a rectangular opening within the drum, a-friction-brake contained within said opening, a sliding bar connected to the brake-shoes, and a rod passing through one end of the shaft and adapted to engage and disengage the frictional surfaces, substantially as described. I

6. The combination of the shaft having a rectangular opening provided with the guides having recesses, the boxes having corresponding projections, the sliding bar, thelinks connecting the boxes and the bar, and suitable means for expanding the boxes, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

PETER L. \VEIMER.

Vitnesses:

W. MORRIS WEIDMAN, JoHN A. WEIMER.

Images