US1030062A - Fluid-pressure motor. - Google Patents

Description

A. G. BLVIN. FLUID PRESSURE MOTOR.

APPLICATION FILED MAB.. 10,*1910'.

Patented June 18, 1912.

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mln-m A, G. ELVIN. FLUID 'PRESSURE MOTOR. APPLIOATON FILED MAB.. 10, 1910. 1,00906W Patsnted June 18, 1912.

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ALBERT G. ELVIN, GF' EAST- ORANGE, NEW JERSEY.

FLUm-rnnssnnn Moron.

Specification of Letters Patent.

Patented l une ltd, igl.

Application .tiled March 1D, 1910.l Serial No. 548,357.

VTn @Z- w/zom it may concern:

which shall attain. the advantages of'thatot'j said application, and embody the further.` advantages of effecting both the opening and closure of the door by fluid pressure and of cushio-ning the movements of the door in both directions.

The improvement claimed is hereinaftery fully set forth.

In the accompanying drawings'. Figure l'is a front view of a firebox door operating appliance illustrating an application of my invention, with the operating cylinder there- 'of in longitudinal central sect-ion; Fig. 2, a plan or top view, partly in section, of the operating cylinder; Fig. 3, a plan view, on

an enlarged scale, of the operating cylinder; Fig. 4, a vertical long1tudinal section t-hrough the lefthand portion of the operating cylinder o'n the line a I) b of Fig. 3; Fig. 5, a transverse section through the operating cylinder, on the line 0 c of Fig. 3; Fig. G, a partial vertical longitudinal section through the same, on the line a ,a of Fig. 3; and, Fig. 7, a vertical section through the tiring opening and one of the door sections.

My invention is hereinu exemplified in connection with a fire door appliance comprehending two door leaves or sections, 9, 9, which are litted to slide horizontally toward and from each other in guides, 3, on adoo'r frame, and to cover and uncover, as the case may be, a firing opening, 2, m a

`irebox or furnace, 1, to which the door frame is connected. `The door sections are moved from and toward each other, to open and close, respectively, the 'firing opening, by means of levers, 12, 12a, pivoted by pins or bolts, 16; to a downward extension of the operating cylinder hereinafter described, the lower and longer arms of said levers eing coupled to the door sections. Intermeshing segment gears, 17, 17a, are termen on the levers, concentric with their pivots, 13, and by the oscillation of said segment geans about their axes, the door sections will be moved from or toward each other, as the same may be. A hand lever, i8, is pivoted to thc bottom guide o' the door iframe, and is provided with a longitudinal slot, 18a, engaging a pin, 1Sb,fixed to the door section, 9, for the purpose of operating the door sections manually, when desired.

In the practice of my invention, as applied in connection with a door mechanism ofthe type above described, a fluid pressure operatingcylinder, 25, is bolted to the top of the door frame, The cylinder, 25, is

cut away on its lower side, so as to allowA thesegment gears, 17, l7,lto project into 1t, and is closed at its ends by heads 26. 2T.

yThe bore et the cylinder, 25, is made of two ditlerent diameters, being greater at, and for some distance from, one of its ends, than for theremainder of its length.

A piston, 2S, is fitted in t-he cylinder, Q5, said piston being, for the major portion ot its length, of such diameter to lit neatly in the'smaller bore of the cylinder, and having a head at one end, similarly fitting the larger here, suitable packing rings, 25), being provided in the head and at the opposite end of the piston, to prevent leakage of fluid. The piston, QS, is recessed on its lower side, to admit the segment gears, 17, 17, and a longitudinal rack or set of teeth, 30, meshingwith the gear, 17, is formed in the recess of the pist-on. Movement to the right or to the left, as desired.` is imparted to the piston by fluid pressure, as hcl-cinA after described, andit will be seen that such movement will, through the segment gears and their connections, move the door sections apart or bring them together, as the case may be.

The supply and exhaust ot motive fluid to and from the opposite ends of 'the piston, 28, toeffect the opening nduclosing movements of the door sections, are e'i'cctcd by the following means. A valve chamber, 54-, which is closed at its top'by a removable plug, Bta,Y is formed in the head, :26, of the operating cylinder, 25, said chamber communicating, at its bottom, with a cylindrical bore which extends through the head and has a valve seat at its top. for the reception cfa door opening suppL and exhaust valve, 33, which seatsdownw rdly,

and is fixed upon a cylindrical stem, 35, iitting truly in the cylindrical and extending for a lshort distance below the lower end thereof. A valve chamber, 54, which is closed at its bottom by a vremovable plug, 54, is formed in the opposite head, 27, of the cylinder, said chamber communicating, at its top, with a cylindrical bore which vextends through the head, but is closed to the atmosphere by a removable plug, 54". A valve seat is formed at the bottom of said cylindrical'bore, for the reception of a door closing supply and exhaustvalve, 53, which seats upwardly and is fixed upon a cylindrical stem, 55, fitting truly in the cylindrical bore.

A supply pipe,\3l, leads from any suitable source of liuid pressure supply, as a main reservoir of an air brake system, into a strainer chamber, 31, located on one side of "the operating cylinder, 25, which chamber may be loosely packed with any material suitable to prevent ingress of dirt and other foreign matter. The supply pipe,

31, and strainer chamber, 31, communicate` by a passage, 31", with a supply passage, 43, which extends longitudinally in the wall ot' the cylinder, Q5, from one of its heads to had to its interior.

the other. The passage, 43, communicates, at one of its ends, with a passage 44, leading into the valve chamber, 34, and communicates, at its opposite end, with a passage, 45, leading intb the valve chamber 54. The cylindrical borel in which the stein otI the valve, 33, is litted, communicates with the adjoining end of the cylinder, E25, by a port, 46, and this cylindrical bore communicates with the atmosphere by an exhaust port, 48, located at a lower level than the port, 46. The area available for discharge of fluid through the exhaust port, 4S, may be varied, as desired, by a regulating valve,

5l, formed on the end of an ad]ust1ng scre\v,

52, engaging a thread in the cylinder head, 26. The cylindrical bore inwhich the stem of the valve, 53, is fitted, communicates with the adjoining end of the cylinder, by a port, 4G", and communicates with the atmosphere by an exhaust port, 43, located at a higher level than the port, 461. rl"he valve stems, 35 and 55, are grooved or peripherally recessed, below and above the valves, 33 and'53, respectively, to eii'ect the opening and closure of ports, as hereinafter described.

A trip rod casing, 5G, is formed on the top of the cylinder, 25, to receive and guide a longitudinally sliding trip rod, 57, the casing being provided with a removable cover plate, 5G, by the detachment of which and of the cylinder head, Q7, access may be The trip rod, 57, is recessed oi reduced inA section tor a portion ot its length. so as to provide shoulders or bearings, 57a and 5T, against one or the borel vber, 34.

other of which a trip, 58, projecting upwardly from the piston, QS, abuts, in the movements ot'- said piston in either direction, and the end of the trip adjacent to the valve stem, 55, is provided with an inclined bearing face, 57C, adapted to abut against said valve stem and unseatI the valve, 54, as the piston, 28, approaches the terminal of 'its stroke in the direction of said valve.

A rod, 39, having a head, 36, which is in contact with the lower end of the stem, 35, of the valve, 33, is fitted to slide vertically in a guide, 37, on the door frame, and is coupled, at its lower end, to a double armed treadle lever, 4l, pivoted to the door frame and carrying a treadle, 42, which normally stands at a level slightly above that of the deck or tiring floor of the iirebox. By downward pressure of his loot on the treadle, 42, the iireman can, through the lever, 4l, and rod, 39, unseat the valve, 33, and upon the release of such pressure the valve will be reseated by the pressure from the supply pipe acting upon it in its cham- A spring, 3U, may be applied to return the rod, 39, to normal position.A

In the operation of the motor, the relnan presses his foot upon the treadle, 4Q, there by unseating the valve, 33, and admitting fluid under pressure from the supply pipe, 31, and communicating valve chamber, 34, past the grooved or reduced portion of the valve stem, 35. and through the port, 43,'

to the leithand end oi the operating cylinder, 25, thereby moving the piston, Q8, thereof, to the right, and, through the rack, 30, and segment gears, 1i' and 1T, :imparting opening movement to the door sections, 9, 9u. As the piston moves forward, and at a point in its traverse at which it has nearly completed the opening movement of the door sections, the trip, 5S, which it carries, strikes the right hand shoulder, 57h.' of the trip rod, 57, thereby moving the latter to the rightand unseating the valve, 53, which admits tluid under pressure from its chamber, 54, to the right hand end of the cylinder, Q5. This end oiE the cylinder being ol smaller diameterl than the left hand or opening end, the pressure admitted will not. prevent the complete opening movementet the door sections, but will cushion and pre 'vent them from slamming or opening with a jar or shock. Upon the release ot pressure from the treadle, 4Q, the valve, 33, is seated by the fluid pressure above it, thereby cut'- ting off the supply of fluid to the lett hand end of the cylinder, and exhausting the fluid from the left hand side of the piston, 25,

through the exhaust port, 48. 4'lhe pressure v from the chamber, 54, acting on the right hand side ot' the piston will move 1t to the left, thereby unpartmg closing movement to the door sections, the trip rod, 5T, holding the valve, 53, unseated until the trip, 58,

strikes the left hand shoulder, 579', of the trip rod, when the latter `will be moved to the lett, releasing the stem, of the valve,

which will be closed. by the pressure below it in its chamber, 5l, and will cut ott the supply of fluid to the right hand end ot' the cylinder, and open an exhaust therefrom through the exhaust port, 48a. At this time, the door sections Will be nearly closed and their momentum Will carry them and the piston to the terminals of movement in closing direction. The regulating valve, 5l, is adjusted so as to sufficiently cushion the exhaust from the lett hand end of the cylinder to preventI the slamming of the door sections in closing.

The appliance is readily applicable inl connect-ion with iireboxes of any of the ordinary constructions, and the Working parts involved are comparatively few in number and ot ysuch character that they can be sub- .gantially made, and are protected from liability to breakage and from damage by the access of dirt. The operation of the door sections is quick, simple, and easy, and

the automatic closure ot the door sections effects the substantial advantage of com-- .blown open, allowing the steam and hot Water to escape into the cab of the engine.

4lVith the mechanically operated door above described, if the door sections should be open and the fireman be firing, the moment Ahe relieves pressure from the treadle the door sections Will be automatically closed, thereby preventing the ingress of steam and hot Water to the cab, and causing them to be blown down through the grate.

I claim as my invention and desire to secure by Letters Patent:

l. rlhe combination of a fluid pressure cylinder having a lateral opening, a differential piston Working in said cylinder and having a rack on its side adjacent to said opening in position to engage a gear extending thereinto; an operating valve controlling -the supply and exhaust of fluid to and from the larger end of the piston, a valve'controlling the supply and exhaust of fluid to and trom the smaller end ot the piston, and a triprod adjacent to the cylinder and actuated by the movement of the piston, for opening said last recited valve.

2 The combination ot' a uid pressure cylinder, a ditlerential piston Working therein, an operating valve which, when unseat ed, admits fluid, pressure lto the larger end ot vthe piston, and` when seated, exhausts fluid pressure therefrom` and which is continuously subject to fluid supply pressure, means i'or unseating the operating valve, and a trip rod adjacent to the cylinder and actuated by the movement of the piston, for eileeting the supply and exhaust ot fluid to and 'from the smaller end thereof.

3. The combination ot a fluid pressure cylinder, a dilierential piston Working therein, an operating valve which, When unseated, admits fluid pressure to the larger end of the piston, and, When seated, exhausts pressure therefrom, and which is continuously subject to fluid supply pressure, means for unscating the operating valve, a valve controlling the supply and exhaust of fluid to and from the smaller end of the piston,

a trip rod normally adjoining the stem of said last recited valve, and a trip carried by the piston and abutting in opposite directions on the trip rod in opposite directions ot movement of the piston.

l. The combination of' a fluid pressure cylinder, a differential piston working therein, headsclosing the ends of said cylinder, a valve chamber in the head adjoining the larger end of the piston, a fluid pressure supply pipe open continuously to the valve chamberfsupply and exhaust ports leading into the cylinder through the head, a valve normally seated, undersupply pressure, in the pressure chamber, and controlling communication between said chamber and the adjacentend of the cylinder and between said end and the exhaust port, means for unseating said valve, valve chamber in the head adjoining the smaller end of the piston, a port connecting said chamber With the supply pipe, supply and exhaust ports leading into the cylinder through said head, valve normally seated in said pressure chamber and controlling communication betiveen said chamber and the adjacent end of the cylinder and between said end andthe exhaust port, and a trip rod adjacent to the cylinder and actuated by the movementof the piston, for unseating said valve.

5. The combination of a fluid pressure cylinder, a differential piston working therein, `an automatically seating operating valve controlling the supply and exhaust of Aluid to and from' the larger end of the piston, means for unseating said operating valve, an automatically seating valve controlling the supply and exhaust of fluid to and trom lthe smaller end 'et the piston, and a trip rod adjacent to the cylinder and actuated by the movement of the piston, for unseating said last recited valve.

The combination ot' va fluid pressure cylinder, a diiterential piston Working therein, an automatically seating operating valve controlling the supply and exhaust ot fluid to and from the larger end of the pis- .i

of the piston, for unseating said lastrecited.

valve prior to the seating of the operating cylinder, a

valve.

' 7. The combination of a Huid pressure diiferential piston Working therein, heads closing the ends of said cylinder, a valve chamber in the head adjoining the larger end 'of the piston, a fluid pressure supply pipe open continuously to the valve chamber, supply and-exhaust ports Aleading into the cylinder through the head, a valve normally seated, under supply pressure, in the valve chamber, and controlling communication between said chamber and the adjacent end of the cylinder, and between said end and the exhaust port, mechanism for unseating said valve, a valve chamber in the head adjoining the small-er end of thc piston, a port connecting said chamber with the supply'pipe, supply and exhaust ports leading into the cylinder through said head, a valve normally seated in said valve chamber and controlling communicationbetween said chamber and the adjacent end of the cylinder and between said end and Athe eX- haust port, a trip rod bearing on the stem of said last recited valveand lit-ted to reciprocate parallel with the piston, two longitudinally separated shoulders formed on said trip rod, and a trip fixed to the piston and adapted to abut against one or the other of said shoulders in cach direction of its movement, to unseat and lpermit the automatic.

seating, respectively, of said last recited Copies of this patent may be ob'tained for five cents each, by addressing the Commissioner of.Patents,

Washington, D.

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