US559526A

US559526A - Hydraulic elevator

Info

Publication number: US559526A
Authority: US
Publication date: 1896-05-05
Anticipated expiration: 1913-05-05

Description

(Nomoael.)

` T. W. HEERMANS. HYDRAULIC ELBVTOR.

` Patented May 5, 1896.

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HYDRAU LiC ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 559,526, dated May 5, 1896.

Appnautn filed May1a1894. sain No. 511,631. on model.)

` at Evanston, in the'county of Cook and State v cated. i i

In the accompanying drawing the gure of Illinois, haveinvented certain new and useful Improvements in Hydraulic Elevators, of which the following is a specification, reference being had to the accompanying drawing.

V The object of my invention is to provide for the certain and gradual stoppage of the car as the piston of the elevator approaches the limit of its stroke. Where high speeds are employed, andes'pecially when `they are employed in conjunction with high pressures, in order to stop the ear automatically at the limits of its travel Without jar it is necessary that a gradual and exactly-regulated closure of the passages leading to and fromthe cylinder should be provided. It is also desirable y that when the car is started in the reverse direction no time should be -lost on account of theclosure of such Water-passages- It isthe object of my present invention to provide means for regulating both the stopping and starting of the car, as above indirepresents a vertical central section of the cylinder of a hydraulic elevator and so much of its appurtenances as are necessary to illustrate my invention. y

'A is the cylinder, which may be `of any de-` sired construction. As shown, it consistsof concentric tubes, the outer tube a being of steel and` the inner tube b of brass. y The in`` termediate layer c between'the tubes a and b may be of any desired-material. 'lo the cylinder is secured` the head B by means of bolts ),conne'cting it to a threaded collarD, screwed to the end of the cylinder. v

E is the piston-rlod, to which is aixed the piston F. Said piston, in order to resist the exceptionally high pressure employedjs pro-` vided with double-cupped leather packings 45 ff. The piston, however, may be constructed in any Weihknown manner,` the forms herein shown being merely illustrative. i i Forming a part oi? or an extension from the piston LF a sleeve Gr,..vi1ichis made tapering, as shown, and at its largest part'iits closely in the cavity ll in the head Il, said cavity' ,forming a part of theWater-passage leading to and from the cylinder A. The dot-ted outlines at the upper end of II indicate the point at which the said passage il leads to the Water supply and discharge passage. y

In the cylinder-head B are formed two auxiliary passages I and J, which open at one end into the cylinder and at the other end into the passage Il at a point beyond that to which the sleeve G extends.V The passage I is provided with lmeans for regulating its effective area, said means, as shown, consisting of a screw K, Whose beveled end forms a valve, seating itself at the bend in the passage I. The passage .I is providedwith an inwardlysrs opening check-valve L, normally held to its forced through the passage I. By properly proportioning the passage I to the pressure and speeds employed and by means of the' regulating-valve K the stoppage of the motion of the piston and the car connected there.

to may be` made as gradual as desired. During the process of y stopping the piston there' is an excess of pressurain the cylinder which vtends to hold the valve L closed; but when the change-valve is shifted so as to introduce' fluid under pressure to the passage II said fluid will open the valve L and flow through the auxiliary passage I to the cylinder. But for this provision the speed of the piston in starting would be limited by the amount of fluid which could pass through the passage I and leak out past the sleeve G,but with the additional `passage .I the reverse movement of the piston is sutliciently rapid.

`For the sake of convenient access I prefer,

especially on small-sized machines employing very high pressure, to make the auxiliary passages I and J through the cylinder-.head;`

but it is iohvious that the ma be made throug'l'lthepiston Without thereby ailiecting the result accomplished or the mode oi aca complishin git. i have indicated such a modication by the dotted lines in the drawingv and. have designated these passages by the letters and J', respectively.

Vithout eonfmin g myself to the precise details herein shown and described, I claiml. The combination 0f a cylinder having a passage for the inlet and exhaust of the fluid; the piston therein adapted to close said passage when near the liinit of its stroke; auxiliary passages not closed by the piston and connecting the interior of the cylinder with the first-named passage; and a check-valve in one of said passages permitting an infiow to said cyiinder but not a return, substantially as described.

2. The combination of a cylinder having a passage for the inlet and exhaust of the fluid; the piston therein adapted to close said passage when near the limit of its stroke; auXiL iary passages not cicsed by the piston and connecting the interior of the cylinder with the first-named passage; means for regulating the flow through one of said passages at will; and a check-Valve in the other of said passages permitting an iniiow to said cylinder but not a return, substantially as described.

THADDEUS W. HEERMANS.

Witnesses:

V. HUGO, CHAs. B. BOWEN.