US399068A - Speed-regulator for elevators - Google Patents

Description

(No Model.)

W. E. NIGKERSON.

SPEED REGULATOR EDE ELEVATOES.

No. 399,068. Pat' ted Mar. 5, 1889.

l N. PETERS, Phsbtningnphar. Wuhingtm D. C.

UNM-en Sterns erreur @ritieni lVlLlIAM E. HKERSON, Ol? CAMBRIDGE, lllASSACIlVSEITS.

SPEED-REGULATOR FOR ELEVATORS.

SPECIFICATION' forming part of Letters Patent No. 399,068, dated March 5, 1889.

i jjslioa'lcn fled November 30,1888. Serial No. 292,235. No `model.)

To LZZ whom it 71mg/ concern:

le it known that l, WILLIAM E. NICKERSON, i ,Y

i the sheave D', attached to the piston-rod l ot Cambridge, in the count-5v oi Middlesex and State ol ).lzissaeliiisetts, have invented a new and useful Improvement in Safety Fluid Speeddegulators Yfor lllevators, of which the lollowix1g,tal{eu in conneetion with the accompanying d rawings, is a specilieation.

The olijeet ol my invention is to yso construct and arrange the parts oi a safety-fluid speedregulator that all of the movements shall he uniform and steady, avoiding, all irregular and abrupt changes either in change oi direction or velocity oi motion. tain by the meehanism shown in The aeconn panying d rawings, in which-- Figure l is an elevation showing sueh parts i of an elevator as are required to illustratemy invention. ingl a part ol the cap-plate of the main cylinder of my device, the loca-lion of the pistonrod and the relief-valves being' shown; and liig. 3 is a cross vertical section taken through the cap-plate on line :r o; ot Fig. and illustrates the eonstruetion and arrangement of the relief-valves.

In that class of safety speed-regulators to which my invention belongs there has heen an irregularity oi' working caused h v thet'act that there is not so much fluid-space in the Cylinder when the piston is down as there is when the piston is up-that is, compensation has not heen made ior the Huid-space oeeu.- pied hy the piston-rod when the rod is in the c vlinder and .for the vacancy caused by its withdravml. This ohjeetion has to some extent heen ohviated in my former inventions, and my present device applies more particularly to that class in which long' cylinders are used.

To give additional evenness of motion and security to the device, l have added a `valve arrangement adapted to operate in the eapplal'e,:although the said valve can he placed in the piston and work equally well.

lu the drawings, Fig. l, A represents the carriage ot' the elevator, l l the hoistin e-rope,

and l a sheave over whieh thehoisting-rope a L valve works in a chamber, P, l'ormed in the l ll passes.

S h" Si is a safety-rope attached to the ele- This object l. atl Fig'. 2 is an enlarged plan showi cylinder C is to admit oi the i'low of liquid vater-carriage, as shown, and, passingl up over the sheave D, descends so as to pass under either by means of a pipe, as shown at H H lig, or made in the walls ol the Cylinders.

The object of having' a (inni-passage leading,` from the auxiliary cylinder t" to the main from one side oi' the piston l to the other in its movement in the cylinder, as well as to admit of the flow ol. the excess of lluid that I would be in the cylinder C when the piston is down, and the piston-rod is within it.

If the pipe ll ll Il2 were omitted, then on the upward movement ol' the piston and consequent withdrawal of the piston-rod a vacuum would be formed underneath the piston, as no oil could get down during,v the upward stroke, the pressure being` upward and against it. This vacuum is the cause of more or less un even n ess and uncertain-ty of motion in stoppin and starting the ear.

It is to he understood that the flow of liuid from one side of the piston to the other as it moves in the cylinder C is partirilly provided for by leakage about the piston or by oriflees made in it.

In the. cap-plate E, l have valves of peculiar construction, as shown in Figs. 2 and 3. The valve V has `an upward-projeeting stein,- V, upon which l place adjlisting-weights The valve has also a downward-projecting stem, Y. The two stems Y and Y" serve to keep the valve in place and leave it Yfree to move up and down, or, in other words, close and open as the piston rises or lowers. rThe eapplate E, as shown Yiu lliu'. il. The ehamher lOO R has a series of openings, P P, toward the auxiliary chamber C', and a corresponding,` series, P' P', toward the main cylinder C. V2, l1`ig'. 3, is a screw-bushing inserted in the under side of the cap-plate E, to complete the chamber R and to afford a guide for the valve-stem V3, as well as a rest or stop for the shoulder V* of the valve-stem V3. The number of the valves V and the series of openings P P and P' P' may be varied to suit the requirements of the case. The valve V opens downwardly to admit the free passage of the liquid from the auxiliary cylinder C' to the cylinder C and closes only upwardly.

By weighting the valve V, I am enabled to so balance it that it will close at any desired upward pressure of the fluid in the cylinder C, this pressure depending upon the velocity of ascent of the piston P', which has a definite ratio to the descent of the elevator-earriage A. Thus by varying the weight IV, I can Control or fix the maximum velocity of descent of the elevator-carriage.

I Claiml. In a fluid speed-regulator for elevators, the combination of the safety-ropeS S' S2, the piston-rod P, and piston P', with the cylinder C, cap-plate E, valves V, auxiliary cylinder C', and pipe H H H2, leading,` from the auxiliary cylinder C' to the lower part of the cylinder C, all opera-ting together substantially as described, and for the purpose set forth.

2. In a safety-fluid speedregulator for ele- Vators,the combination of the piston-rod P, piston P', main cylinder C, cap-plate E, and valve V, having adj Listing-weights V\7,with the auxiliary cylinder C' and pipe H' H H2, substantially as described, and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 28th day of Novembor, A. D. 1888.

WILLIAM NICKERso.

IV'itnesses:

FRANK G. PARKER, MATTHEW M. BLU-NT.

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