US1030064A - Fluid-pressure motor for fire-box doors or other reciprocating members. - Google Patents

Description

i A. G. gLvN.

E FLUID PRESSURE MOTOR FOR FIRE BOX DOORS' 0R OTHER REGPRQATING MEMBERS.

APPLICATION FILED JULY 3. 1911.

2 SHEETS-SHEETYI.

A. G. ELVIN.

FLUID PRESSURE MOTOR POR PIRE BOX DOORS 0R OTHER RBGIPROGATING MEMBERS.

` APPLIUATION FILED JULY 3, 19114 1,030,064.,

Patented June 18, 1912.

2 SHEETS-SHEET 2.

Hela. 6.-

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h lllLRT (2*. EL'VN', 01 SOMERVILLE, NEW JERSEY.

'lilLr'iltlCl-Pli'tlltll MTR 'FERTE-BOX DORS 0R OTHER RECIPROCATING MEMBERS.

insonne.

Specication of Letters Patent.

.Patented tiene it, 3HE-Jim.

application filed July 3,191.1. Serial No. 635,701.

To all whom it may concern:

Be it known that Si, ALBERT G. ELvIN, of Somerville, in the county of Somerset and State of New Jersey, have invented Aa certain new and' useiul improvement in Fluid- Pressure Motors for Fire-Box Doors or other `Reciprocating Members, of which improvement the following is a speciication.

The object or my invention is to provide means whereby fire-bon doors or other reciprocating members may be actuatedg by iluid pressure, so as to eiiec't both their opening and closure, and the cushioning ot their movements in either direction, with the capacity of ready disconnection of the pneumatic operating mechanism Whenever itmay become necessary 'or desirable to manually operate the reciprocating members. ill`he improvement claimed is hereinafter fully set forth. '-l i ln the accompanylng drawings: Figure l is a front view oit a rebox door operating appliance illustrating an application of my invention, with the` operating cylinder thereof in longitudinal central section; Fig. 2, a side view, in elevation, of the removable door or the gear casing; Fig. 3, a view,

partly in plan and partly in horizontal centralsection, ofthe operating cylinder; l? ig. 4, a plan View, on an enlarged scale, of the left hand portion oit the operating cylinder; Fig. -5, a vertical transverse section through the operating cylinder and valves, on the line a a of Fig. 4; Fig. 6, a similar section through the inclosure of the'operating valve and exhaustregulating valve, on the line ZJ b of Fig. 4; Fig- 7, a similar section through the upper portion of the operating cylinder, on the line c c of Fig. 4, and F ig. 8, a similar section through the gear case, on the line d Z of Fig. 3.

illy invention is herein. exemplified in connection with a iire`door appliance comprehendinff tWo reciprocating members, 9,9, performing the function of lire box door leaves or sections, which are fitted to slide horizontally toward and from each other in guides, 3, on a door frame, and to cover and uncover, as the case may be, a firing opening in a lire-box or furnace to which the door frame is connected. The door section Yreciprocating members are moved from and toward each other, to open and close, respectively, the tiring openingyby means of levers, 12, 12, pivoted by pins or bolts, i3, to la gear casing hereinafter described, the lovver and longer arms ot said levers being coupled tothe door sections. lntermcshing segment gears, l?, 17a, are formed on the levers, concentric with their pivots, 13, and by the oscillation oit said segment gears about their axes, the door sections will be moved from or toward each other, as the case may be. A hand lever, 18, is pivoted to the bottom guides oit the door frame, and is provided with a longitudinal slot, 18a, engaging a pin, 18h, 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 of the type above described, a-fluid pressure cylinder, 25, is bolted to the top of the door frame, and is closed at one of its ends, in this case the left hand end, by a head, 'G. The cylinder, 25 is formed integral With, or xed to, an open bottomed gear casing, Q5, into -which the segment gears, 17, 1T, project, 4and through which it is connected to the door frame. The end of the cylinder opposite that to which the-head, 2G, is secured, is open to the gear casing.

A piston, 28, is fitted in the cylinder, 25, and is formed integral With, or fixed to, a piston rod, 28a, 'which is niadc of such diameter as to cause thearea of thc piston effective for pressure ton-be substantially less on the piston rod side than on the opposite side, the former being, say, one halt the latter, thus constituting the piston a differenti-.il one. 'lhe bore ofI the cylinder, 25, at, and for some distance' `from, its open end, is in correspondence with the diameter of the piston rod, and the latter. is, in this in,

stance, shown` as formed in two sections, which are connected by a bolt, 28h. The piston is fitted with packing rings, 29, andthe piston rod with packingrings, 29a.v The.

ond of the piston rod which projects through the open end ot the cylinder, is coupled, by

a pin, 19, to an arm, 19, on the segment gear, 17, the pin passing through'a longitudinal slot in the arm, so as` to admit of the vibration of the latter about the axis of the segment gear. An extcnsion,n28d, is formed on the outer end of the piston rod to prevent the pin Jfrom rolling down into the gear casing when it is detached from the arm and temporarily stowed at the side of the extension. In order to prevent the pin, 19a, from being lost, it is preferably, as shown, coupled to the gear casingl 9,5, by

a chain, 19", the slack of which depends in al pocket in the casing. Movement to the right or to the left, as desired, is imparted to the piston by iluid pressure, as hereinafter described, and it will be seen that such movement will, through the segment gears and their connections, move the door sections apart, or bring them together, the case may be.

'l'he supply and exhaust of motive fluid' to and from the opposite sides ot' the piston, 28, to effect the opening and closing movements ot the door sections, are eilectcd by the following means'. A pressure chamber, 34, which is closed, at its top, by a removable plug, 341, is formed on one side of the op erating cylindeiy, saidchamber communieating, at its bottom, with a cylindrical bore which extends through the wall of the cylinder andv has a valve seat at its top for the reception ont a door openingsupply. and

exhaust vval ve, 33, which seats downwardly and is fixed upon a cylindrical stem, 35, titting truly in the cylindrical bore and extending for a short distance below the lower end thereof. Another pressure chamber, 54, which is closed at its top by a removable plug, 54, is formed in the metal ofthe cylmder, adjacent to the chamber, 34, and sub-.

stantially in the vertical axial plane of the cylinder, said chamber conununicating with the chamber, 34, by a port or passage, 43. A valve seat is formed'in the bottom of the pressure chamber, 54, for the reception of a door vclosing supply valve, 53,'which seats downwardly and is fixed upon a' cylindrical" stem, 55, fitting truly in 'a cylindrical bore extendingr from the lpressure chamber, 54,

i into the bore of the cylinder, 25. The stem,

55, is recessed or reduced in diameter immediately below the valve, 53, and a port or passage, 53a, extends through the stem, from the recessed portion, nearly ,to its lower end and is continuously open,'-"ithroughy flatera branches, to the bore of the cylinder around the piston rod, 283,and to the space around therecessed portion of the stem, 5,5. The supply pipe, 31, communicates, through a port or passage 31", with the port, 43, which connects the pressure chambers, 34 and 54, and with a lubricating,- cup, 44, from which oil.is supplied to the valves andto'the cylinder, 25. -A port or passage, 45, leadsjrom the left hand end of the cylinder to a lateral branch port, which opens into the bore iniwhich the stem, 35, of the valve, 33,/

is fitted., -The stem,.3,5, is recessed orA ret duced in diameter below the valve, and the port, 45a, is continuously open to the .Space in the bore surrounding the recessed portionof the stem. An exhaust port, 48, leads from the, bore to the atmosphere, said exhaust port being so located that Vwhen the valve,

33, is seated, it will be Iuncovered by the re-l cessed portion ofthe stem, and will therefore .be in communication with the ports, 45 and 45. lVhen, however, the valve, 33, is unseated, the port, 48, will be closed by the portion of the sten'i ot full diameter below it. The area available for discharge of fluid through the exhaust port, 48,-mi1y be varied, as desired, by a regulating valve, 51, formed on the end of an adjusting screw, 52, engaging a thread in theinetal of the cylinder.

A shoe, 28e, is fitted on the upper side of the piston rod, 28a, in position to. abut against the lower end of the stem, 55, of the valve, 53, said shoe being recessed at and adjacent to its endnearer the valve stem and upwardly inclined from its" recessed portion, which is'not in contactwith the valve stem, to its portion' of full thickness. When, in thetraverse of the piston rod to the right, the inclined portion of the shoe strikes the valve stem, it thereby u nseats the valve, 53, and holds it unseated during the remainder of its traverse to the right.. When, in the traverse of the piston rod to the left, the recessed portion of the shQe cornes below the -valve stem, thelat'te's thereby freed -from contact with the. shoe,

and the valve, 53, is seated by the luid lp re'streadle lever, 41, pivoted to the door frame and carrying a treadle, 42, which normally stands at a level slightly above that of the lcou-pled, at its lower end, to a'double armed i deck or firing floor of the rebox. -By downward pressure of his foot on the treadle, 42,-

the fireman can,through the lever, 41, andVlr rod, 39, unseat the valve, 33,'and 'upon the release of such pressure, the valve will be reseated by the pressure from l'the supply pipe acting upon it in its chamber, 34. A

spring, 39, may'be applied to return. the

rod, 39, to normal position.

f A swinging door, 25h, is pivoted tol the side of the gear easing, 25a, adjacent to the extension, 28", of the piston rod, for the purpose of enabling the pin, 19?, which conl d nect-sthe piston rod withthe gear, 17, to be detached from the casing and withdrawn, when, 'for any purpose, it, may be desired to disconnectl the lfluid mechanism and open manually in the ordinary manner.

In the operation of the motor, the tireman presses hisfoot upon the treadle, 42, thereby unseating the valve, 33, which admits fluid pressure from the supply pipe, 31, and communicating valve chamber; 34, past the grooved or reduced portion of the valve stem, 35, and throughv the ports, 45 and 45, to the left hand end of the operating' cylinder, 25, thereby moving-the piston, 28, thereof to the right, and through theconpressure operating, and close the doors v on its opposite sides, the fluid pressure ad-y mitted on the right hand side will be sufficient only to check 'or cushion the stroke of the pistolrto the right, and thus prevent slamming or shock of the doors, Without preventing them from being completely opened. T he unreduced portion4 ot' the shoe, 28e, holds the valve, 53, unseated until the completion of the right hand stroke. Upon the release of pressure on the treadle, 42, the valve, 33, will be seated by the tluid pressure above it, and when seated, its stem, 35, will uncover the port` 48, thereby permitting the release of fluid from the left hand end of the cylinder to the atmosphere, through the ports, 45, and 48. In the left hand stroke of the piston. the shoe, 28', holds the valve, 53, unseated, until its reduced portion comes below the valve stem,

55, which Will be /near the end of the stroke,

When said valve will be seated by the pressure above it. The expansion of the Huid on the right hand side of the piston, and the momentum of 4the door sections, will carry the piston to the end of its left hand stroke, when the door sections Awill be completely closed. The regulating'valve, 5l, is adjusted so as to suiliciently cushion the exhaust from the left hand end of the cylinde'r to prevent the slamming of the door sections in closing.

If, by reason of failure of fluid pressure,

l derangement of moving parts, or for any other reason, it becomes necessary, or is desired, to discontinue the operation of the fluid pressure mechan1sm, the door, 25h, is

f opened, and the pin, 19, withdrawn and temporarily deposited on a horizontal portion of the gear easing below the-door, thereby disconnecting the piston rod from the gear. 17, and permitting the door sections to be manually operated by the lever, 18, the pin being prevented from heilig 'lost by its chain connection' to the casing.

The 'appliance is readily applicable, in connection with ireboxes of any of the ordinary constructions, and the Working parts involved are comparatively few in number and of such character that they can be substantially made and are protected from liability to breakage and from damage by the access. of dirt. The operation 0f the door sections is quick, simple, and easy, and the automatic closure of the door sections effects the substantial advantages of compelling single shovel firing, the advantage of which practice, in economizing fuel, perfecting combustion, and reducing irebox and flue repairs, has been universally recognized in railroad service. The facility of connection and disconnection of the operating mechanism and the doors is of substantial advantage in providing for the operation of the latter under anyT contingencies interfering with the normal working of the former which may be presented in-practice. Another important advantage is afforded in the prevention of serious or fatal injury to the engineer' and fireman in the event of a flue bursting or a crown sheet coming down, in which case, an ordinary swinging door would be blown open, allowing the steam and hot water to escape into the cab of the engine.

lVith the mechanically operated door above described, if the door sections should be open and the fireman be tiring, the moment he relieves pressure from the treadle the 'door sections will be automatically them to be blown down through the grate.

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

l. The combination of a fluid pressure operating cylinder, a piston and rod Working therein, a gear casing fixed to one end of the cylinder, intermeshing segment gears journaled in said gcarfcasing, a detachable pin coupling1 one of said segment gears to the piston rodlnnd a door closing alateral opening inthe gear casing for the insertion and removal of thel coupling pin.

2. The combination of a fluid pressure operating cylinder, a piston and rod Working therein, a gear easing fixed to one end of the cylinder, internieshing segment gears journaled in said gear casing, a detachable pin coupling one of said segmentgears to the pist-on rod, a lateralreceptacle in the gear casing for the reception of the pin when detached, and a chain connecting the pin to the gear casing.

ALBERT ELVIN.

Witnesses C. L. VVINEY, F. W. MARTIN.

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