US182280A - Improvement in elevators - Google Patents

Description

W. K. MARVIN.

ELEVATOR.

Patented-Sept.19,1876.

Java/W 1 N.PEYF.RS. PHOTO LTROGRAPH WASHINGTON n C NI'IED STATES PATENT WALTER K. MARVIN, on NEW YORK, N Y.

IMPROVEMENT IN ELEVATORS.

Specification forming part of Letters Patent No. 182,280, dated September 19, 1876; application filed August 12, 1876.

To all whom it may concern:

Be it known that I, WALTER K. MARVIN, of the city, county, and State of New York,

have invented certain new and useful Improvements in Elevators, of which thefollowing is a specification:

In Letters Patent No. 109,331, dated November 15, 1870, I have described and claimed an elevator in which are combined a car balance-box, weight, and means for transferring.

as a weight, I now propose to use a liquidsuch as water-which may be transferred from balance-box to balance-box, or from balanceboX to car, or vice versa, as desired.

In using the phrase from balance-box to balance-box I mean to indicate that in lieu of applying the weight in one direction direct- 'ly to the car, as in my former Letters Patent,

this weight may be carried by a second balance-box, connected with the car in such manner as to operate to move the car in a direction opposite to that in which the other balance-box operates, which would, in effect, be equivalent to directly weighting the car itself.

I have indicated in the accompanying drawing one way in which my invention may be carried into effect.

Figure l is a diagram representing so much of an elevator as needed to illustrate my invention. Fig. 2 is a sectional plan, on an enlarged scale, showing the arrangement of the valves.

A is the car, movable vertically in suitable guides, suspended by a rope, to, which passes over a pulley, b, and is attached to the balancebox B, which also is movable vertically in suitable guides. .In this case the car-itself is provided with a suitable tank, 6, to receive the water needed to overbalance the weight represented in the balance-box B. O is a pump, operated by any suitable power. From one end of the pump-cylinder leads a pipesection, 0, which connects with the force side -c d enter the shells D E.

der seats or shells D E branch two pipes, f v g and h t, eachset being equidistant from the point where their respective intermediatepipes V The pipe fof the valve D and the'pipe h of valve E converge and merge into one pipe, j. In like manner the pipes g 'i converge and merge into one pipe, it; Each valve D or E is a two-way valve, whose communicating ports Z are separated by a distance equal to that which separates each intermediate pipe 0 d from either of its branch pipes fg or' it i. The valves are to be so connected and geared that, when the valve D is turned to bring its pipes cg into communication, the valve E will be turned to bring the pipes d h into communication. into pipe k, which communicates, through flexible tubing is, with the tank on the car. Pipe hleadsir1topipej,which communicates,through flexible tubing j with the balance-box. Supposing, therefore, the tank and balance-box to-contain water, and the pump to be in op eration, the result'of thisposition of the valves would be to draw the water from the balancebox, and to force it into the tank on the car, thus decreasing the weight of the former, and increasing the weight of the latter. On the other hand, reverse the position of the valves, which can be done by giving them about a quarter-turn in the other direction, so as to put 0 in communication with f, and d with t. This will have the effect of drawing water from the tank on the car, .and forcing it into the balance-box.

The transfer of water can at any time be arrested entirely by giving the valves about one-eighth of a turn, bringing its ports-opposite the solid sides of their seats intermediate between the-openings therein.

The valves are to be connected with, and operated by, a handrope, arranged with relation to the car similarly to the hand-rope in my before-mentioned Letters Patent, as will be understoodwithout further explanation. I

also propose to use a brake substantially in the way indicated in my said Letters Patent.

1 have indicated one way in which my in- Pipe 9 leads vention may be carried into effect. It is manifest, however, that the arrangement and construction of the connections may be varied considerably without departure from my invention.

What I claim, and desire to secure by Letters Patent, is-

In an elevator in'which the car is caused to ascend and descend by the shifting of a weight, as described, the combination of the balancebox or reservoir, the counter-balance reservoir,

either on the car or in a separate box, conduits connecting said reservoirs, and a forcing apparatus adapted to transfer the liquid through said conduits from one to the other of the reservoirs, the combination being andacting as set forth. 1

In testimony whereof I have hereunto signed my name this 7th day of August, A. D. 1876.

WALTER K. MARVIN. Witnesses:

B. F. LEE, A. PoLLoK,

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