US1030234A - Fluid-pressure motor for fire-box doors. - Google Patents

Description

A. (1. E'LVIN. FLUID PRESSURE MOTOR FOE FIRE BOX DOORS.

Patnted June 18, 1912.

2 SHBETSSHEET 1.

APPLICATION FILED SEPT. 28, 1909.

Lwwgwk A. G. ELVIN.

FLUID PRESSURE MOTOR FOR FIRE BOX DOORS.

APPLICATION FILED SEPT. 28, 19094 LO3Q234 Patented June 18,1912

2 SHEETS- SHEET 2.

FIGZ. FIGS.

\ a g 2.9 2.9 i 1 1 r1 I W i 25' 25 25 i 1 p my {my la 1 g 4 a I I il I ;|?/%F Hui fir 22L i 3 i 43 w I 8 44 'flfi 46 43 43 l i i i 3 .38 i 1 H 1 I 1 i 1 1 I A f T:

. WITN ESSES ALBERT G. ELVIN, OF EAST ORANGE, ERSEY.

Specification of Letters Patent.

FLUID-PRE S S URE MOTOR FOR FIRE-BOX DOORS.

Patented June 18, 1912.

Qriginal application filed February 5, 1907, Serial No. 355,877. Divided and this application filed September i 2 8, 1909. Serial No. 519,998.

To all ma a maylcomelm,

Be it known that I,YALBEariG. formerly of Franklin, 111 the county of Ve;

nango and State of Pennsylvania, but now of East Orange in the county of Essex and State of New .lerse'y, have invented acertain new anduseful Improvement in Fluid- Pressure Motors for Fire-Box Doors, of which improvementthe following is a specification.

' My invention relates to fluid pressure'actuated appliances for opening and closing the doors of fireboxes or furnaces, and is more particularly designed-. ;fo1" '11se incon nection with the locomotive firebox door mechanism set forth in .an application for Letters Patent filed by me February. 5, 1907 tion, of ready applicability under limita-v tions of space, and free from liability to derangement in operation. f V

The improvement claimed is hereinafter 3 fully set forth. s E

In the accompanying drawings: Figure 1 is a front view, partly in elevation and partly in section, of a firebox door appliance, illustrating an application of my in- 5 vention; Fig. 2, a vertical section, on'an enlarged scale, through the lower portion of the cylinder and its lower head,-showing the operating valve as unseated for the supply of fluid to the piston; Fig. 3, a similar view, 0 showing the operating valve as seated for the exhaust of fluid from the piston; Fig. 4, a horizontal section through the cylinder and piston; and, Fig. 5, a vertical section through the lower portion of the cylinder 5 andv its lower head, taken at rightv angles to Figs. 2 and 3.

My invention is herein exemplified as in connection with the fire door appliance of my application Ser. No. 355,877 aforesaid,

the same (which is not claimed herein) comprehending two door sections, 9, 9

which are fitted to slide toward and from opening in a fire box or'furnace to which the door frame is connected. The door sections are moved from and toward each other, to open and'close, respectively, the firi 1g opening, by means of levers, 12, 12, pivoted by,

plnsor bolts, 13, to one side .of the door frame, and carrying arms 14, 14, in which are formed curved slots, 15, engaging pins, 16, 16, 'formedor fixed centrally on the door sections, 9 and; 9?, respectively. Segment gears, 17 17., are formed on the levers,

12, 12*, on thesides of their pivots farther from the armsgfl, 14:, and an operatinghandle, 18,, 1s'=forme'd on the outer end of one of the arms, as the upper arm, M, by

the movement of which handle, through the pins, 16, 16*, and the meshing of the teeth of the segmentgears, 17, 17, the door sections may be manually simultaneously moved away from -,or toward each other, as desired. T; f

In the practice of my invention, as applied in connection 'with the door moving mechanism abovedescribed, a fluid pressure operating cylinder, 25, is bolted to the side of the door frame, 3, which adjoins the segment gears, 17,17, of the door section levers, and is closed at its upper and lower engagement of: the curved slots, 15, with the ends by heads, 26, "27. The cylinder, 25,.

is cut away on its, side next :the segment gears, so as to allow them to project into it, and 1s fitted with apiston, 28, provided with suitable .packing rings, '29, near its lower end-."; '-;A? 'longitudinal recess is; formed in the piston 28, abov'eglts packingrings, and-is provided with a rack or'plurality of teeth,

30, engagingthe teeth of the segment gear,

17", oftheclovietifdoor section." Upward movement is imparted to the piston by fluid pressure, which preferably compressed air, admitted to-its lower end through a supply pipe, 31,, and it is moved downwardly by 'a spring, 32,.abutting on itsupper end and on the upper head, 26, of the cylinder. It 'will be seen that the upward and downward movement of the piston, will, respectively, 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 of-motive fluid to and from the piston are effected by an op crating valve, 33, which is of the lift or puppet type, and is fitted to move horizontally in a chamber, 34, in the lower cyljecting arm,"38, whichbears agai'nstjo'n'e arm of a doublearm'ed lever, 39, journaled on a pin, 40,- fix'ed in the doorv frame below the lower. doopsection, and the opposite arm of said lever f'is connected to the inner arm of a double armed treadle lever, 41,1011?" naled on the lower portion of the door frame. The outer arm of the treadle lever is bent downwardly to a level slightly above th at of the deck or firing floor of the boiler and carries. a treadle, 42. By downwar pressure of hisfoot upon the treadle, 42, the

firemanfcan, through the lever system above" .described, {unseat the operating valve, and,

upon the release of such pressure, the valve will bev r eseated by the pressure from the supply pip'e'fa'cting upon it in its chamber, 34 I Acentral supply passage, 43, is formed in tl1e.-,valve'stem, 35, said passage communi-- catin by radial ports, 44, with the valve 35 chamber, 34, when the operating ;'-valve is- ,unseated,'- and extending to radial ports, 45, leading into an annular peripheral groove or channel, 46, in-the valve stem. As a me ch'anical equivalent" for v the central passage,

' 40 43, and radial ports, 44, a peripheral-groove may be formed on the valve stem, in the plane of the ports, 44, and a lateral groove be formed-on saidstem connecting said peripheral groove with the groove or channel, 46, similarly to thecentral passage, 43,

which is shown. In all positions of the operating valve and stem, the channel, 46, registers with a main supply and exhaust @port, 47, leading through the lower head, 27 into the cylinder, 25, and, when the op crating valve is seated, it also registers with a final exhaust port, 48, in the head, leading to theatmosphere. A preliminary exhaust passage, 49, is formed in the wall of the cylinder, said passage opening thereinto by a port, 50, located slightly below the level of the bottom of the piston, 28, Wheniat the upper extremity of its traverse, and the lower end of the preliminary exhaust pas- 50 sage opens into the cylindrical bore in which the valve stem, 35, works, at such-a point in the length thereof as to register with the channel, 46, of said stem, and, through said channel. with the final exhaust port, 48,

when the operating valve is seated. The

" haust port, 48. The operating fluid is therearea for traverse of fluid through lthe port, "47 is made less than thatthrough the preliminary exhaust passage, and is varied, as desired, by a regulating valve,'5l, formed on the'endof anadjusting screw, 52, engaging a thread in the lower head, by the; movementof which screw, thevalve, 51, may be caused to close the port, 47 either entirely or to any desired de ree. 7

In the operation 0 J the motor, the fireman 7 5 places his foot on the treadle, 42, and: there by depressesthe outer endof the lever,f41, which, v through the lever,"39, and rock shaft, 37, and its arms, transmits the applied pressure to thestem, 35,1'ofthe oper- 30 ating valve, 33, and unseats said valve. Op-

erating fluid is thereby admitted .to the cyl- ,inder, 25, belowits piston, 28, through the,

ports, 44, passage, 43, ports, 45, peripheral channel, 46, and port, 47, the pressure of, the fluid raising the piston to the limitgof its upward traverse, in which, through; the gearing and door levers, it moves the" door sections away from one another the limit of their traverse, and fully opens or uncovers the firing opening. Said opening remains uncovered only so long as the pressure of the firemans foot, is maintained on the treadle, and, upon the release of; this pressure, the operating valve. is imi'n'e'diately 5 seated by the pressure in itschamber, 34. The, upper'end port, 50, of the preliminary exhaust passage, 49, has previouslybeen uncovered by the piston passing" above it, and the lower'end of said passage has, by the seating of the operating valve, been brought into communication with the channel, 46,

*and final exhaust port, 48. The port 47 is also open to the channel, 46, and final exfore exhausted from the cylinder, and the piston ,is forced down by the spring, 32, bringing the door sect-ions to their normal closed position in its downward movement. The preliminary exhaust being open before thep-isto-n commences its downward stroke, the larger portionof the operating fiuid below the piston will be immediately released, thereby allowing the door sections to be quickly started in their-closing movement, and as the port, 50, .is closed bythe piston in passing it, the.remainder of the downward stroke ofthe piston and the resultant movement of the door sections will be made more slowly, owing to the comparatively re 1 stricted discharge opening through the port,

47, as regulated by the valve, 51. The piston-will be thus, in a substantial degree,

cushioned, sothatf while the..door sections start to close quickly, they will come together easily and without shock. l

The construction of the appliance is such as to involve comparatively fewworking parts, and these are of such character that they can be substantially madeand are pro- 130 tected from liability to breakage and from and flue repairs, has been universally recognized in railroad service. I

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

1. The combination of a fluid pressure cylinder having a lateral opening and a closing head provided with supply, exhaust, and auxiliary exhaust ports, a 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 operatin vpiston valve in the closing head of the cy inder controlling the supply, exhaust, and auxiliary exhaust 'of fluid to and from said cylinder, and a spring bearing on said piston and acting to effect its traverse in a direction opposite to that effected by the action of fluid pressure.

2. The combination of a fluid pressure .cylinder having a lateral opening and a closing head provided with a direct supply and exhaust port, a 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 pis ,ton valve in the closing head which, when unseated, admits fluid pressure to the cylinder, and, when seated, exhausts fluid pressure therefrom, and which is continuously subject to fluid supply pressure, a lever for unseating the operating valve, and. a spring bearing on the piston and acting to eflect its traverse infa direction opposite to that effected by the action of fluid pressure.

3. The combination of a fluid pressure cylinder having a lateral opening and a closing head provided with a direct supply,

- and exhaust port, a 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 piston valve in said closing head which, when unseated, admits fluid pressure to the cylin- --der, and, when seated, exhausts pressure therefrom, and which is continuously subjectto fluidsupply-pressure, a lever system, one member of which contacts with the operating valve, means, for unseatingthe operating valve through the lever system, and a spring bearing on the piston and acting, when the operatlng valve is seated, toefiect the traverse of the piston in a direction op posite to that eflected by the action of fluid pressure. 1

l. The combination of a fluid pressure cylinder having a lateral opening and a closing head, a piston working in said cylinder operating valve.

the operating valve to admit fluid pressure to the cylinder and permitting it to be re seated by fluid pressure to exhaust fluid pressure from the cylinder. 5. The combination of a fluid pressure cylinder having a lateral opening and a closing h'ead provided with a direct supply andexhaust port, a pistonworking in said cylinder and having a rack on its side adjacent 'to said opening in position to engage agear extending thereinto, an automatically seating operating piston valve in said closing head and controlling the supply and exhaust of fluid to and from the piston through the supply and exhaust port, an adjustable valve in said head and port and interposed between the piston and valve, and means for unseating said operating valve.

6 The combinatic nrof a fluid pressure cylinder, a piston Working therein, a head closing one end of the cylinder, and provided with an operating-valve chamber and a cylindrical bore for an operating valve stem, a fluid-supplypipe leading into the valve chamber, a main supply and exhaust port leading from the cylindrical bore into the end of the cylinder,- a preliminary exhaust portleading from said bore into the cylinder .in a plane adjacent to the limit of outward traverse of the piston, a final exhaustport leading from said bore to the atmosphere, an operating valve adapted to seat in the valve chamber at the inner end the closing head, an

of" said bore, a stem' fixed to said valve and fitting inand passing through said bore, and having a peripheralgroove or channel adapted to register with the ports aforesaid, av longitudinal passage in said stem having radial ports at its ends leading to the pe-- ri-pbery of the stem adjacent to the valve and to the peripheral groove or channel re spectively, and means for unseating the 7.'The combination of a fluid pressure cylinder, a piston working therein, a head closing one end of said cylinder and .provided with an operating valve chamber, a cylindrical bore leading therefrom to the opposite side of the head, and an operating valve seat at the inner end of said bore, a main supply and exhaust port and a preliminary exhaust port, each" leading from said bore into the cylinder, a final exhaust v i 75 supply pressure, and meansrfor unseating" port leading from said bore to the atmosphei'e, an operating valve adapted to close upon the valve seat, a stem fitting in and passing through said bore and having a peripheral groove or channel, a passage leading-through said stem and havlng radial orts at its ends leading to said groove or channel and to the erlphery of the stem, respectively, and a uid supply pipe leading into the operating valve chamber. 7

8. .The combination of a fluid pressure cylinder, a piston Working therein,a head closing one end of said cylinder and pro vided with an operating valve chamber, a

cylindrical bore leadin therefrom to the op osite side of the hea and an operating va ve seat at the inner end of said bore, a

main supply andexhaust port'and a pre lilninary exhaust port,' each leading iiOm said bore into the cylinder, a final exhaust port leadingfrom said bore to the atmos-l phere, a puppet valvein said valye chamber having a cylindrical stem in which are formed radial ports adjacent to the valve,

a peripheral groove or channel between said ports and the opposite vend of the valvestem, and a longitudinal passage connecting said radial channel, an means for operating .the puppet valve to connect the radial ports with orts and peripheral groove-or

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