US487709A - Hydraulic elevator - Google Patents

Description

(No Model.) T' BROWN J HYDRAULIC ELEVATDR.

UNITED STATES PATENT OFFICE.

THOMAS E. BROWN, JR., OE NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE NATIONAL COMPANY, OF CHICAGO, ILLINOIS.

HYDRAULIC ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 487,709, dated December 13, 1892.

Application filed December 19, 1889. Serial No. 334,339. (No model.)

To all whom, t may concern.-

Be it known that I, THOMAS E. BROWN, .I r., a citizen of the United States, residing at New York, in the county' and State of New York,

have invented certain new and useful Improvements in Hydraulic Elevators, of which the following is a specification.

The increase in the height of various architectural structures in which elevating appa- :o ratus must be employed has rendered ineiiicient for the higher buildings many constructions of elevating apparatus and appliances therefor which are practically effective in buildings of ordinary heights. Thus the int 5 creased distance which the elevator-car must travel renders itnccessary to extend the length of the cylinder; but this cannot in ordinary constructions be done beyond a limited extent, inasmuch as it is not practicable to use zo piston rods or connections longer than metallic bars can be rolled in continuous pieces, which length is insufficient to secure the extent or amount necessary in very high structures. In order to secure the desired travel z 5 of the cage and avoid the necessity of using long continuous rods passing through stuffing-boxes for connecting the piston to the viexible suspensories, I construct the apparatus as fully set forth hereinafter,l and as 3o illustrated in the accompanying drawings, in

Which- Figure l represents in elevation a tower of unusual height with -an elevating apparatus embodying my invention. Fig. 2 is an enlarged view of part of the apparatus.

The cylinder A is of more than ordinary length, and instead of being closed at both ends has a lower cap l and is open at the upper end and is there connected by a contract- 4o ing trunk 2 with a tubular conductor 3, which extends to and receives the motor-fluid from a tank 4. The tank 4 is situated at such a height as may be necessary to secure a fluid column of the weight sufcient to lift the cage,

and as this height above the cylinder A is greater than the length of any continuous piston-rod that could be practicably employed I extend the connection 6 between the piston and the cage or flexible suspensories 5 in the 5o form of cables, or preferably, as shown, of a series of jointed links. As said connection 6 is thus carried through the conducting-tube 3 and through and above the body of the liquid in the tank, there is no necessity for using any packing-box, and the connection between the piston 7 andthe traveling pulley or pulleys for the flexible suspensories can be made in any suitable manner and without the use of continuous rods of uniform diameter, as would be necessary if the cylinder 6o were closed at the top, as usual.

To reduce the weight and amount of fluid stored in the apparatus, I reduce the diameter of the conductor 3; but, if desired, the same may be continued its whole length of the same diameter as the cylinder.

The connections between the piston connection 6 and the iexible suspensories may be of any suitable character-as, for instance, pulleys 8, supported by fixed bearings, and 7o pulleys 9, carried by the head l0 at the termination of the connection 6, round which pulleys the suspensories 5 pass to multiply the movement between the head l0 and the cage C, as usual.

The motor-power is applied to lift the cage by permitting the fluid to flow from below the piston to the discharge-pipe l2 by properly adjusting the valve device 13 by any suitable connections from the cage. Vhen the 8o cage is to descend, the valve is adjusted to permit the fluid to pass through a circulating-pipe 14:A and valve-casing and pipe l5 to the bottom of the cylinder. It will be seen that it is practicable to lift the piston with the upper end of the cylinder open and with the heavy column between the piston and the tank by thus circulating the fluid, While it would not be practicable to elevate the piston with the cylinder in constant communication 9o with the tank and under such pressure in any other manner.

Without limiting myself to the precise construction and arrangement of parts shown, I claim 95 1. An elevating apparatus provided with a cylinder and piston, a conducting-tube extending from the top of the cylinder above the limit of travel of the piston to an elevated reservoir containing the motor-fluid, and a cage connected with the piston by connections extending through the said tube and IOO reservoir, and a valve device controlling the How of said motor-fluid to and from the opposite sides of the piston, substantially as set forth.

2. In an elevating apparatus provided with a cylinder, piston, cage, and elevated reservoir containing the motor-Huid and with a condueting-tube between the top of the cylinder from a point above the limit ot travel ot the piston and reservoir, the cage attached to the piston by connections extending through the tube, and circulating-tubes connecting the lower end of the cylinder and with the upper end below the eondueting-tube, and a valve device for permitting the fluid to circulate from the open space above the piston to the closed space below, substantially as described.

3. The combination, in an elevating apparatus, of a cylinder', piston, elevated tank containing lnotor-tluid comm unieating with the open upper end of the cylinder above the limit of travel of the piston through a tubular connecting-pipe, and a cage, fiexible suspensories, connections extending from the piston through said pipe, and traveling sheaves arranged above the tank and carrying the suspensories, substantially as set forth.

LL. The combination, in an elevator apparatus, of a cylinder, piston, elevated tank containing` motor-fluid Communicating with the open upper end of the cylinder above the limit of travel of the piston through a tubular eonneetingpipe, and connections extending from the piston through said pipe to the trav eling sheaves arranged above the tank and carrying the [lexible suspensories and cage, substantially as set forth.

In testimony whereof I have signed my name to this` specification in the presence of two subscribing witnesses.

THOMAS E. BROWN, JR.

Witnesses:

ISAAC. B. POTTER, KENNERLEY BRYAN.

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