US51076A - Improved steam hoisting apparatus - Google Patents

Description

VUNITED STATES PATENT Ormea.

OHAS. It. OTIS AND NORTON l?. OTIS, OF YONKERS, NEW YORK.

IMPROVED STEAM HOISTING APPARATUS.

Specification forming part of Letters Patent No. 51,076, dated November 2l, 1865.

To all whom 'it may concern:

Be it known that we, CHARLES R. OTIs and NORTON P. OlIs, both of Yonkers, in the county of Westchester and State of New York, have invented aeertain and new and useful Improvementin Steam Hoisting Apparatus; and we do hereby declare the following to be a full, clear, and exact description ofthe same, reference being hadto theaccompanying drawings, forming a part of this specitieatiomin which- Figure l is a side elevation ot' a steam hoisting apparatus with ourinvention applied. Fig. 2 is a top view of the same, partly in section. Fig. 3 is a part of an end elevation of the same. with our improvement attached.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to a mode ot' coinbin ing the friction-brake of a steam hoisting` apparatus with the stop-valve by which steam is shut oi' and admitted to the steamengine of such apparatus, whereby the brake is brought or permitted to come into action by the act of closing such valve to shut off the steam, and is thrown ont of action by the act of opening such valve to admit steam to the engine.

In carrying out the invention the brake may be operated either by a weight or by the pressure of steam on a piston; but in either case a piston working within a steam-cylinder is connected with the brake for the purpose or" being acted upon by the pressure of steam within the said cylinder to throw the brake out of action, and the valve or valves which ad mit the steam to the said cylinder and provide for its escape therefrom are connected with the stopvalve of the engine in such manner that by the act of closing and opening the latter valve the former valve or valves will be properly actuated to produce or permit the action of the brake or to throw it out of action, as may be requisite.

To enable others skilled in the art to make and use our invention, we will now describe its construction and application with reference to the drawings.

A is a foundation for the supportof thehoist ing apparatus and its operating-en gine.

B is the main drum of the hoisting apjaratus. The said drum B is provided at one end with a large pulley, O, Figs. 1 and 2, and a brake-pulley, D, Fig. l, which are all attached to one shaft a, Figs. l and 2, and are supported between two standards, E, Figs. 1 and 2, of which but one is shown in Fig. 2, as the drum Bv is not represented in full length', butis broken oft'. These standards E are tirmly attached to the foundation A. The pulley O receives a band, O, which also runs on a pulley, N, on the crank-shaft h, Fig. l, of the steam-engine, and which so transmits motion from the engine to the hoisting-drum.

The only otherparts ot the engine represented are the framing K, the valve-box L, which contains the stop and reversing valve, the 1ever M for working said valve, and the induction and eduction pipes S and T.

Around the pulley D, Fig. 1, is placed the brake-strap b, the two ends of which are connected with the ends of two short arms of a lever, c 0, Fig. 1, which extend in opposite di- 'rection from a rock shaft, F, Figs. l and 2.

To one end ot' said rock shaft F is firmly attached a long lever, Gr, Figs. l and 2, the end of which is connected at e with the rod 7 oi' a piston, g, working in the stationary steam-cylinder H,whieh is firmly secured to the founda tion A. The said lever G is represented in Figs. l and 2 as furnished with aweight, I, by which it is depressed, and thereby made to tighten the brakestrap b upon the pulley D by its action upon the rock-shaft F and its arms o c.

To the bottom of the cylinder there is attached a valve or four-way cock, t, Fig. l, the shell or casing of which is connected by an in dnctionpipe, u, with the main induction-pipe s ot' the engine, and by an eduction-pipe, fv, with the main eduetion-pipe T of the engine. The passages of this valve or cock are so arranged that by turning or moving the said valve or cock a proper distance the lower end otl the cylinder may be brought either into comA munieation with the induction-pipe u or eduction-pipe v. The spindle m of this valve or cock t is so connected by an arm, l, and rod k with the lever M of the stop orreversing valve ot' the engine that when the said lever M is in the position represented in black outline in Fig. 3, to close the latter valve and stop the engine, the lower end ot' the cylinder H is in communication through the valve t with the eduction-pipe v, but closed to the inductionpipe a, and that when the said lever M is depressed to the position shown in red outline in the same gure to bring the stop and reversing valve to a position to admit steam for driving the engine and hoisting-drum ina direction for raising the load, or When the saidlever is raised a corresponding distance above the position shown in black to admit steam for driving the engine and hoisting-drum in a reverse direction, the lower end of the cylinder H is in communication through the said valve twith the inductionpipe, but not with the eduction-pipe, of the engine. It will be understood that by this system of connections between the lever M and valve-spindle m, in the act of closing the stop-valve to shut oft' steam from theengine, the lowerend of the cylinder H will have the steam shut off from it and will be opened to the exhaustpipe, so that its piston g can descend freely and allow the WeightI to act upon the brake, and the act of opening the stop-valve to admit steam to the engine to start the hoisting apparatus in either direction will cause the admission ot' steam to the lower part of the cylinder H for raising the pistong and connected brakelever G, and thereby throwing the brake out of action.

Instead of employing` the weight I on the lever G for bringing the brake into action, the pressure of steam may be used above the pis ton g; and to provide for the admission of steam to the upper part of the cylinder H for this purpose, and the exhaustion ot' such steam' vwhen the brake is to be thrown out of operation, a valve or four-way cock, w, Fig. 2, simi lar to t, is attached to the upper end of the cylinder, and its shell or casing is connected in a similar manner Wit-h the branch induction and eduction pipes u and c, and an arm, p, on the spindle y of the said cock or valve is connected by a rod, o, with the arm n'of the spindle m of the valve t, the arrangement of the passages and connections of the said valve or cock w being such that steamis admitted to the cylinder H above the piston g when the lever M is in a position to` close the stop-valve of the engine, and the upper part ot' the said cylinder is opened to the eduction-pipe when the said le ver is in position to open the stop-valve. The said valve or cock w always closes the upper end of the cylinder to the eductionpipe when it opens it to the induction-pipe, and vice versa.

We have not thought it necessary to partielllarly describe the construction andthe arrangement ot' the passages of the valves or four-way cocks t and w, for the reason that they have no particular novelty and could be constructed by any skilled engineer to Whom the duties required ot them were explained.

What we claim as our invention, and desire to secure by Letters Patent, is-

So applying theleverof the brake of a steam hoisting apparatus, steam-cylinder and piston, and suitable valves, and connect-ing the same with the lever of the stop-valve of said steam hoisting apparatus, that by operating the latter lever to let on or shut oft' steam a'reverse movement is effected in the valves of the cylinder attached to the brake, substantially as herein described.

UHAS. R. OTIVS. NORTON P. O'IIS.

Witnesses:

HENRY T. BROWN, J. W. CooMBs.

Images