US1577908A - Door-motor control - Google Patents

Description

March 23 1926.

v 1.. P. HYNES noon MOTQR CONTROL 2 Sheets-Sheet I 1 Filed July 2, 1919 March 23 1 926.

| P. HYNES noon. MOTOR CONTROL Filed July 2, 1919 2 Snets-Shee t 2 A ttorney Patented Mar. 23, 1926.

UNITED STATES PATENT] OFFICE.

LEE 1?. ms, or ALBANY, nnw YonK, Assre'non roconsoLrnATnn CAB-HEATING comm, or ALBANY, NEW YORK. A coaroaArron-or WEST VIRGINIA.

noon-moron con'rnon.

'Applicafion filed July 2,

.To all to wlzom it may concern:

Be it known that I, LEE P. HYNES, a citizen of the United States, residing at Albany, in the county of Albany and State 5 of New York, have invented certain new and useful Improvements in Door-Motor Controls, the following being a; full, clear,

' and exact disclosure of the one form of my invention which I at present deem preferable. i

' For a detailed description of the present form of my invention, reference may be had to the following specification and to the accompanying drawings forming a part 1 thereof, wherein Fig. 1 is a horizontal section of the pneumatic push-buttons showing one button pushed in;

ig. 2 is a front elevation of the pushbutton box; Fig. 3 is a horizontal section of the buttons in normal position;

.Fig. 4 is a pipe diagram.

My invention relates to a means for manually controlling doors or similar devices operated by a stroke motori. e. a motor which performs its intended work by a s' gle stroke. Such motors have heretofore been controlled by means of pistons 30., acting on the motor valves and the said pistons controlled in turn by means of an electromagnetic valve the circuit of the magnet being extended to electrical pushbuttons at the point of ultimate control. It

is my purpose in the present invention to provide similar push-buttons which are however not electrical but pneumatic and which operate directly the valves which control the valveoperating pistons afore- 40 said. By my arrangement, I dispense with all electrical intermediaries and yet secure the same control of the motor without us ing any greater amount of air.

Referring to Fig. 4, G and G "are two pistons which act alternately on the stems or plungers C, C of the motor valves'To one end of each of the cylinders which the respective pistons move, the air is supplied b the ipes g, g both of which lead away om e motor to the point of ultimate control and may be herein referred to as service pipes. At that point the pipes are connected with ducts 10, 10 formed in a push- 1919. Serial No. aoaisa.

cast iron block 12 that is mounted on a post D or otheri support. As appears in Figs. 2

.and 4 the pipes =9 g enter the under side.

of the block 12, so that from the horizontal sections of that block shown in Figs. 1 and 3, it will be manifest that the ducts 10, 10 lead downward into the respective pipes g 9 The ducts 10, 10 communicate respectively with horizontal axial ducts formed in brass plugs 5,-5, driven into round holes in "the block. On one end of each plug 5'is seated a spring-pressed valve .1. The chambersi'containing the two valves 1 are both supplied with air through a duct 4 that communicates with a pressure supply pipe 2 through a strainer 3. The pipe 2 and fstrainer 3 are shown in Figs 2 and l as applied to the under side of the aforzsaid cast-iron block 12. Henceitwill be obvious from the horizontal sections of block 12 in Figs. 1 and 3 that the duct 4 leads down ward through the block into the strainer 3 and pipe 2 and conducts the suppliedair therefrom upward into the horizontal duct connecting the two valve-chambers. On the opposite side of each plug '5 is a chamber in which slides a hollow button or fingerpiece 9. In the center of each finger-piece is an exhaust valve 7 that seats against the set lips a, a, that engage shoulders on the valves. Each admission-valve is provided with a stem 6 which passes through the axis of'plllg 5. and through an axial hole in the exhaust valve 7 to a point near the botton of the cavity in the push-button. Normally the-finger- pieces 9, 9 stand in the position shown in Fig. 3, but either one may be pushed inward as shown at the left of Fig. 1. When a. finger-piece is pushed in, its first effect is to compress sprmg 8 and thereby force the exhaust; valve 7 against its seat on plug 5. The second efiect, as the finger-piece is pushed'in still farther, is to lift the admission valve 1 by engaging its stem 6, from its seat on plug 5 that the left finger-piece in Fig. i is thus pushed in, the air frOQZEPP P 2 will positive action of the piston Gr which conenter duct 4 and flow ence, as the arrows indicate, into the axial passage in plug 5 and through duct ..10 to the pipe g leading to the back of piston G The piston G will then act to start the motor in--say, a door-opening direction. This it does by pushing to the left a cam-slide D that first lifts valve-stem C by means of the incline shown in dotted lines on the upper edge of the cam-slide and then pushes under the lifted valve-stem a supporting portion of a block or dog D, contained in a recess in the front side of the camslide in front of the two oppositely sloping inclinesby which the slide lifts valve-stem C if moved to the left, or valve-stem C if moved to the right in Fig. 4. The block or dog D then maintains the valve'in its uplifted position. Thus by a mere momentary pressure on finger-piece 9 the door is started and will continue on its course -.until, by automatic means not shown, the motor re:tores the valve maintaining slide D to the neutral position represeitledin Flg. 4:, ptlshing. the maintaining g D out from under valve-stem C and allowing said st m to operate.

In the above described operation of the push-button several features'may be particularly noted. First. The closing of exhaust valve 7 priorto the opening of admission valve 1, not only. prevents all leakage of pressure but also insures a very quick and trols the motor. The preliminary closure of the exhaust valve converts the long service pipe extending from the motor to the distant point of control, into a closed chamber. The subsequent opening of the adm1s sion. valve impresses'on saidchamber a sudden impulse of high pressure that is 'trans- I 'mitted instantly to-the cylinder containing one of the pistons G G2 which form an extension, ofthe said closed chamber. This produces the quick and positive effect aforesaid. Second. It com els the operator to press the buttonproper y or no action at all results. Third. The first effect of releasing the finger-piece after it has been pushed in is merely to allow the springs to react, the admission valve remaining 0 en and the exhaust valve remaining close This affords a time element, brief indeed, yet sufiicient to insure adequate air pressure'reachmg the piston G Fourth. The admission valve l seats before the exhaust valve unseats. That also prevents loss of air pressure and aids" materially in enabling the press-button valve, located at a distance from themotor, to be used as a manual controller with the same cited? as a magnetic valve located close to the motor. Fifth. While the admission valve 1 is moved back tov its closed position bythe spring-it is, retained inthat position by the air pressure since. the air is permitted to act on t e back side of it as it approaches and reaches its seat on plug 5. It is thereby maintained closed when not being used for motor control.

When the finger-piece 9 has been entirely released and the exhaust valve is finally open, the exhaust pressure acts through port 10 and is distributed and dispersed through several channels. Thusit goes into the annular space around the finger-piece 9 and thence into a narrow space 15 between the front face of the block and the name-plate thereon, this space being open to the atmosphere. There is also a cross-duct 16 formed in the block through which the exhaust pressure can pass into a similar annular space around the other finger-piece 9. By this cross duct the exhaust pressure afore- I said can also pass into the other duct 10" and thence through theother sQrvice pipe to the other piston but it becomes so attenuated as to exert no material influence thereon. The effect of this dis ersing of the ex-' haust pressure is to mu e completely the sound of the exhaust. The apparent action of this pneumatic push-button is exactly that of the ordinary electrical push button; even the operator himself can not tell the dili'erence although the entire organization is materiall different.

What I c aim as new and desire to secure by Letters Patent is:

1. The combination with a valve-operating cylinder and piston of a service pipe leading therefrom to a distant point of control, a push-button and pressure supply pipe at said point, and also at said oint exhaust and supply valves for said service pipe, both operated y said push-button in the same stroke but separately and in sequence.

2. The combination with a valve-operating cylinder and piston, of a service pipe leadlng therefrom to a distant point of control, a push-button and pressure-supply pipe at said point of control, and also at said point exhaust and supply valves for said service pipe,.the exhaust valve closing in advance of the opening of the su ply valve by the same strokeof the push-button. 115

3. The combination with a valve-operating cylinder and piston of means for maintaining the valve in its operated position .pipesapush-button, a spring-actuated sup- I ply valve, an exhaust valve and a s ring between said exhaust valve and t button.

5. The combination with a valve-operating cylinder and piston, of a service pipe leading, therefrom to a' distant point of control, and at said point of control a supply pipe, a push button, aligned supply and exhaust valves for said service pipe, a valve stem from the supply valve extending through the exhaust valve to the push-button and a spring between. said push-button and the exhaust valve.

6. The combination with a valve-operating cylinder and piston, of a service pipe leading therefrom to a distant point of control, and at said point of control a supply pipe, a push-button, a spring operated supply valve for said serv1ce pipe, an

e push- .oppositely acting exhaust valve therefor en closed in the puslrbutton, a valve stem between said supply valve and a spring between said exhaust valve and the push butating said valves whereby the ton.

7. The combination with a valve-operating cylinder and piston, of a service pipe leading therefrom to -'a distant point of control, and at said point of control asupply pipe, supply and exhaust valves fo said service pipe, a push button acting 'di ctly on one valve and indirectly on the other valve, and an enclosing structure for said valves provided with means for mufiling the exhaust pressure. i y

8. The combination with two valve-openating cylinders and pistons of service pipes leadm to a distant point of control, and at sai point a push-button, two normallyopen exhaust valves in communicating chambers, andmeans for separately operexhaust from one'valve may flow back through the other open valve.

9. The combination with a cylinder and a valve operating piston therein, of a service pip:1 for said cylinder, an admission valve tween said service pipe and said cylinder, a finger-piece for operating said admission valve, and an exhaust valve having a portion movably mounted within said finger-piece.

10. The combination with a valve-operating cylinder and piston, of a service pipe, a push-button, an admission valve, a spring therefor, an operating finger-piece, an exhaust valve in said finger-piece, and a spring between said finger-piece and the exhaust valve.

11. The combination with a valve-operating cylinder and piston, of a service pipe, a push-button, an admission valve, a spring therefor, an exhaust valve, and an operating finger-piece for said'valves operating by a yielding connection the exhaust valve'an byl an unyielding connection the admission Va ve.

12. The combination with, two separate valve stems, of fluid pressure cylinders, one

for each valve stem, a valve stem retaining device positioned to engage said valve stems and having pistons extending into the respective cylinders, a control station,

service pipes leading from said control sta- I tion to the respective cylinders, a supply pipe at said control station, separate pairs of admission and exhaust'valves for each service pipe, and separate. manual devices for operating each pair of said valves.

13, The combination with two separatevalve stems, of fluid pressure cylinders, one for each valve stem, a valve stem retaining device positioned to engage said valve stems and having pistons extending into the respective cylinders, a control station, service pipes leading from said control station to the respective cylinders, a supply pipe at said control station, separate pairs of admission and exhaust valves for each service pipe, and independent push buttons forrespectively operating each pair of sand valves. i i

Signed at Albany, county of Albany and State of New York, this 27th day of J une, 1919.

LEE P. 'HY NES.

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