US937384A - Fluid-pressure motor. - Google Patents

Description

J. E. OSMER.

FLUID PRESSURE MOTOR.

APPLIOATION fILnD 00T. a, 1906.

' 'l Patented 00t.19,1909.

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Toall whom i concern:

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citizen of the United States, residing at- This invention relates to e. motor of the samegeneral form es the motor yshown und described 1n Patent No. 899,999, issued to me September 29, 1908, seid motor being designed a-rticulnrly for opening end closing doors, or operating railway switches, and foi-.similar purposes.` The motor comprises a hlgh-pressure cylinder und a low-pressure cylinder arranged in tandem, the pistons of A seid cylinders being "arranged to move together end being operatively connected with ,the door or other device to be moved.

One of the objects of this invention is to produce a valve mechanism especially adnpted for controlling motors oi the class .referred to. A

Another object is to provide means for admitting an extra amount of pressure Huid to the low'ipressure cylinder for building up the working pressure therein. ln the accompanying drawings, Figure'l is o.'longitudinal central section through n buidpressure motor embodying the features of my invention. Figs. 2, 3, and 4f are detail sectional views showing the -dierent positions of the valve mechanism. Fig. 5 is a detail sectional view showing the valve fece. Fig. 6 is e, viewv illustrating sin alternetive construction of the velve mechanism,

the seme being represent-ed in theposition.

correspondin to that shown in' Fig. 2.

The embo ment herein shown of my invention comprises e. high-pressure cylinder 1 end a low-pressure cy inder 2 arranged in tandem, and formed, in this instance, of an integral costing. 'llhe motor is adopted to he secured to any suitable support by mea-ns of lugs 3 cast integral with the cylinders 2l end 3. The pistons Il end 5 for the cylinders 1 and 2, respectively, are'ixed to' theA opposite ends of e rack her 6. Between its .ends the rech bar 6 is supported upon e bearing shoe 7 adjustebly mounted in the cylinder structure. Bearing lugs 8, prefer ably cest integral with. thel cylinder'ireme, rotatably support e shaft. Seid shaft hes deed thereto e sector 10 adopted' toV mesh with thereclnbsno, the. cylinder structure having a -slotll formed! therein to receive said sector. Upon one end of the shaft 9 is fixed e lever 12 operatively connected with the doorv or other device to be moved.

The vulve mechanism that controls the .passage of pressure fluid to and from both cylinders is locnted upon the outer end of the high-pressure cylinder 1. Upon seid cylinder 1 is s. pressure chest ladapted to be pleced in communication with suitable pipe M seid pipe being screwed vinto either the walls of seid pressure chest, the opening not used being closed by a plug 1G. A port 17 is connected at one end with the interior of the lowpressure cylinder 2 by means of the pipe 18. vAn inlet port 19 and 'un exhaust Aport 2communicete with the' port 17 and open upon the valve face The pressure chest 13 is connected with the high-pressure cylinder 1 by eA port 22. 4An exhaust port23 communicates between the valve face 21 andthe atmosphere. A' slide vulve 24 is slidnbly mounted between guides 25 formed upon the vulve 4face-21, said slide valve having upon its face u groove 26 adapted to .connectthe ports 19 and 22, and zt groove 2T adapted to connect the ports 20 lund 23. In the slide valve 21 is also formed un opening 28 extending through said slide velve and located in position to be brought slide valve 24C is reciprocated by means com prisiug n crank disk 29, said crunk disk being mounted upon the lower end of e vertical shaft 30 rotatably' mounted in u bearing 31 upon the upper well of the pressure chest.13. Fixed to the under side of the crank disk 29 is e cra-nkpin ladepted to lie within n transverse groove 33 in the slide vulve 24. 'lhe shaft 30 is rocked to reciprocate'the slide valve 24: by means of n crunk arm 34 connected in any suitable way to 'a controller (not shown) located within convenient reach of the operator.

'Assuming the parte torbe in the position shown' in Fig, .1, the o eration of the motor is as follows; The hig i-pressure cylinder 1 is connected with the pressure. chest 13 through the port 22, and theA low-pressure 'nder 2 is connected with the atmosphere .supply of pressure fluid by means of an inletinto register with the exhaust port 20. The

.one-of two threaded openings 15 formed in 't ough the pipe 18, the port l?, the enhenst 1 port 20, the groove 27, and the exhaust port 23. The pistons 4 and 5 are consequently moved toward the left (Fig. 1) by the pressure of the fluid within the high-pressure cylinderl. When it is desired to reverse the movement of'the door or other device being operated, the operator moves the slide valve 24 into the position shown in Fig. 4, wherein the cylinders 1 and 2 are placed in communication with each other through the passages 22, 26, 19, 17, and 18, equalizing the pressures in said cylinders.` -The piston 5 in the low-pressure cylinder havinga larger area than the piston 4 in the high- -pressure cylinder, the total pressure exerted upon. the piston 5. will be greater than the total pressure exerted upon the piston 4, causing a 'movement of said pistons toward the right. If now it be desirable to increase the pressure in said cylinders, thq'slide valve 24 is moved to the position shown in Fig. 3,

- causing the opening 28 to register with the port 20, and thereby permitting the 'entrance of high-pressure liuid to the cylinders l and 2. The movements of the valve 24 being under the control of the operator, said valve may be moved to admit an eXtr'a amount of pressurefluiwd 'Whenever and in the amounts necessary. When theA pressure has been augmented to the desired degree, as indicated by the movement of the'door', the operator moves the valve 24 from the position shown in Fig. 3to that shown in Fig. 4. Such movement is suflicient to carry the opening 28 out of register with the port 20, thereby cutting ofI the suppl y of higlrpressure fluid to the cylinders, but it is not sufficiently great to carry the groove 2G out of register with the ports 19 and 22, thus leaving the cylinders l and 2 in communica tion with each other. As will be understood, the slide valve 24 may be moved back and forth slightly to bring the opening 28 Iinto register with the port 2O at intervals to build up the pressure in the cylinders as needed.

In Fig. 6 'I have illustrated a modified construction wherein the end of the slide valve 24 is partially cut away, as at'l, so as to ,permit of covering and uncovering the port 20 in the same manner as the opening 28 is made to coincide with said port.

As the movements of the valve member 24 are under the direct control of the operator,

` he is enabled. tovmanipttlate the mechanism as required..- To illustrate, ,it is desirable, as hereinbefore stated, to cushion or retard the movements of the door near :he ends of its travel. This may be accomplished by slightly shifting the valve member -24 from the positions shown in Figs. 2 and 4, thus cutting off communication to a. greater or less extent between the low-pressure cylinder and the exhaust or between the high-pres- 0 sure cylinder and the low-pressure cylinder.

The escape of the air contained in the space in front of the advancing piston being thus retarded, the movement of the door near the the oorivay. The same result may be obtained by making the inlet ort 22- and the exhaust port 23 quite smal or restricted.

When high-pressure fluid is admitted to the 4high-pressure cylinder 1, the exhaust from the low-pressure cylinder 2 will be somewhatchoked, thus providing a cushion near the end of the travel of the pistons toward the left, Fig. l. Constricting the passage 22 results in a similar eifect when the pistons 1 and 2 are placed in communication with each other and the pistons are traveling toward the right, Fig. 1.

- I claim as my invention:

1. In a fluid pressure motor, in combination, an intermittently-operating cylinder; two sources of pressure Huid at varying pressures; and a distributing'valve mechanism for said cylinder controlled by the operator and movable through variable distances by t-he operator, and adapted to connect said cylinder with either of said sources of pressure fluid.

2. In a fluid pressure motor, in combination, a high-pressure cylinder and a lowpressure cylinder said cylinders operating intermittently; a `pressure chest; a valve mechanism comprising a slide valve in said pressure chest, the movements of said valve being controlled by the operator, and said slide valve being reciprocablc through vari-i able distances by the operator, said mechanism comprising means for connecting said high-pressure cylinder with said pressure chest, and for connecting said cylinders together, said mechanism also comprising means for connecting said low-pressure cylinder with said pressure chest.

3. In a fluid pressure motor, in combination, a high-pressure cylinder and la lowpressure cylinder; a pressure chest; and a valve mechanism comprising a slide valve in said pressure chest; a valve face, said valve face being connected with said cylinders by means of ports, .said slide valve having a groove adapted tol connect said ports, said slide valve also being adapted to permit the passage of fluid from saidv pressure chest to said ports while said ports are connected together by said groove.

4. In a fluid pressure motor, in combination, a high-pressure cylinder and a 10W- pressure cylinder said cylinders operating intermittently; and a single valve member movable variable distances by the operator for placing said high-pressure cylinder in communication with a source of pressure fiuid, for connecting said cylindnrs together, and for connecting said low-pressure cylinilo e der with the exhaust, said member also being in; and a slide valve having a groove therein adapted to connect said low-pressure cylinadapted to connect said first mentioned' inlet der with the source of pressure vfluid. port with one of the last mentioned ports,

' 5. The combination, Wlth 'two cylinders,` said valve also havinga groove adapted to 5 one of said cylinders having a valve face ,connect the other of said last mentioned inlet thereon,y one 'of said vcylinders communicat.- ports With said exhaust port. n

ing with said Valve face by means of an inlet IJOHN E. OSMER. port, the other cylinder communicating with .VVtnessesx said valve face by means of tWo inlet ports, L. L. MILLER,

le said valve face having an exhaust port therei GEORGE L. CHINDAHL.

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