US1837129A

US1837129A - Power hoist curtain

Info

Publication number: US1837129A
Application number: US505337A
Authority: US
Inventors: Jack B Maples
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-12-27
Filing date: 1930-12-27
Publication date: 1931-12-15
Anticipated expiration: 1948-12-15

Description

Dec. 15, 1931.

J. B. MAPLES POWER HOIST CURTAIN Filed Dec. 27, 1950 2 Sheets-Sheet 1 INVENTOR.

ATTORNEY.

Dec. 15, J B M PL S POWER HOIST CURTAIN 2 Sheets-Sheet 2 Filed Dec. 27, 1930 I INVENTOR. J'aelzB/Ilapiag A TTORNEY.

Patented Dec. 15, 1931 v I DR TA E JACK B. names, or MIDDLESIBQRO, KENTUCKY rownnrrors'r cunmm Application filed December 27, 1930. "Serial in. 505,337,

This invention relates to a power hoist cur-.

tain particularly adapted for use on locomotive cabs, and has for its primary object to provide, in a manner as hereinafter set forth, a curtain of such character which may be a quickly raised from within the cab by merely turning a valve,thereby providing an element of safety for the Occupants of the cab in the event of a wreck or the like.

A further object of the invention is to provide a power hoistcu'rtainof the character aforesaid, the operation of which will not be a'flected" by strain caused by curves'in the track. p i

A further object of the invention is to .pro-

'vide a power hoist curtain of the character aforesaid which is maintained entirely out of the Way when the curtainelements are in open position, and therefore which need not be removed during the seasons of the year in which the curtain elements "are seldom or never needed. f

With the foregoing and other objects in view, the invention consists ofthe novel construction, combination and arrangement of parts as hereinafter more particularly described, and as illustrated in the accompanying drawings; wherein is shown an embodiment of the invention, but it is to be understood that the description and drawings are to be taken as illustrative and that the invention is intended to be limited only by the scope of the claims hereunto appended.-

like numerals are employed to designate like parts throughout the several views Figure 1 is a sectional side elevation showing a power hoist curtain in accordance with this invention in applied position with respect to a locomotive cab.

Figure2 is an enlargedfragmentary section taken onthe line 2-2 of Figure 1.

Figure 3 is a vertical transverse section taken at a pointindicatedby the line 33 ofFigure 1.

Figure 4 is an enlarged sectional elevation through the pressure cylinder and associated parts. i

Figure 5 is an enlarged section taken on the line 55 of Figure 4; i

Figure 6 is a top plan of a modified form of pressure cylinder and associated parts.

Referring to the drawings in detail, the numeral '1 indicates generally a locomotive cab having the usual side openings 2 which are adapted to be closed bymeansof a pair of curtain elements 3 forming a part of the present invention; The curtain elements 3 ma be formedof any suitable flexible materia and are pro-10 vided 'adgacent their lower edges vwith oppositely isposed anchor members 4: formed at their outer ends with spherical heads .5 which are adapted to slide within slotted 7 guide elements 6 secured to the walls of the a openings 2. The guide elements 6 are of c lindrical construction and are flaredat t eir upper ends as indicated at to permit the ready insertion of the heads 5 thereinto. While the heads 5 are shown as spherical, and the guides 6 as cylindrical, the heads and guides might be of any other suitable, corresponding shape.

The curtain elements 3 are securedat their upper ends to drums 8 which are preferabl formed with reduced end portions 9. Eac

of the drums 8'is fixedly mounted on a shaft 10 extending therethrough, the shaft being "rotatably supported in a, pair' of brackets 11 secured to the cab 1. Eachof the'shafts 10 on which the drums 8 are mounted is provided at one end with a pulley 12 which is mounted for rotation with the-shaft. In the accompanying drawings in which Suitably connected with the cab 1, by means of brackets 13, is a pressure cylinder 14 having oneend thereof connec'tedwith an air pressure line 15' provided with acut off valve 16 and furtherprovided with an exhaust valve 17'located between the valve 16 and the cylinder 14. Slidably mounted within the cylinder 14 is a piston 18 which is fixedl secured to a piston rod 19 slidably 'exten ing through a stufiing box 20 formed on'the end of the cylinder 14 opposite the air line 15. The'piston rod 19 is flattened at its outer end as indicated at 21, the flattened outer endbeingfixedly secured to a substantially U-shaped supporting member 22 for a stub shaft 23 which is journaled in and extends through the supporting memms ber. Fixedly mounted on the shaft 23, between the'legs of the member 22, is a gem 24, the teeth of which mesh with the teeth of a rack 25 supported by brackets 26 secured to the cab 1. Depending from the Support ing member 22 is a guide bracket 27 which is suitably formed to receive a lower portion of the rack '25 therein, the guide bracket 27 serving to steady the member 22 with respect to the rack 25.

Fixedly mounted on the stub shaft 23-is a double pulley 28 to which is connected a pair of

chains

29 and 30 respectively. The chain 29 passes over an .idler pulley 31 rotatably mounted on a stubshaft 32 journaled ina bracket 33 secured to the cab 1. From the idler pulley 31, the chain 29 extends to the pulley 12 on one of the shafts and is fixedly secured to such pulley. -The chain 30-'e:'xtends from the pulley 281to the pulley -12 on the opposite. shaft 10 and is fixedly se'-' cured to such pulley. The

chains

29 and 30 extend over the pulleys '12 in an outward direction andhave portions thereof wound -overthe pulleys;

In Figures 1 and '3, the curtain elements 3 are shown'in closureposition, in which position the piston '18 will be located ad- 'rjacent the end of the cylinder 14 connected with the airline 15, :and the valves 16 and .17 will :be closed. If it is desired to elevate tthecurtain elements .3 toopen position, the :valve 16 is opened to provide for the ad- :mission of compressed air .or the ilike into the cylinder 14 in order to movethe piston -18 longitudinally of the cylinder. *Upon 'movem'ent of the piston .18, the

gear .24 is moved along the rack and .thechains 29 :and are wound on the pulley 28 simultaneously withlthe unwinding of the chains from the pulleys 12. The unwinding of the :chains from :thepu-lleys 12 cause the drums 8 tobe rotated in .a manner to wind thecurtainelements-3 thereon. The ratio of the ,gear 24 to the strokes of the piston 18 is such that the curtain elementsl3 will be elevated {by .one:stroke of the piston operating in a relatively short-cylinder. So long as the valve 16 remains open, and the valve '17 remains .closed, the air pressure within the cylinder 14 .will maintain the curtain elements in their .open or raised position.

. If it is desired to lowerthe curtain ele- =ments 3, the valve 16 is closed and the valve '17 is opened to relieve the pressure within the cylinder. After the pressure within the -:cylinder has been relieved, the curtain elements 3 may bereadily moved to closure posithe cylinder may escape to prevent undue strain on the cylinder.

Instead of employing the gear 24 and rack 25 in connection with a relatively short cylinder such as 14, a relatively long cylinder such as shown at 34 in Figure 6 may be employed. The employment of a long cylinder such as 34 also necessitates 'the employment of a relatively long piston rod 35 in order that the piston 36 may move throughout the length of the cylinder 34. "When this form of cylinder and piston rod is employed, preferably the piston rod will have fixedly connected thereto a bracket 37 which is slidably supported within a suitably mounted guide 38 disposed beneath the projected piston rod 35. Fixedly connected to the bracket 37 are a pair of

chains

39 and 40 which correspond to the

chains

29 and 30 heretofore described. The form of cylinder and associated parts shown in Figure 6 may be employed advantag eously whenever it is unnecessary to limit the length ofithe cylinder due to lack of space.

It is thought that the many advantages of a power hoist curtain in accordance with this invention will be readily apparent, and although the preferred embodiments of the invention are as illustrated and described, it is to be understood that changes in the size,

shape and arrangement of parts may be rek sorted'to, so long as such changes fall within the scope of the invention as defined in the appended claims. WVhile the invention is above describedin connection with a locomotivecab, it is to be understood that the same may be employed in connect-ion with any vehicle or the other structure for which the same is foundto be applicable.

lVhat I claim is 1. In an apparatus for winding a curtain on a drum to hoist the curtain, apressure cylinder, a .piston slidable within the cylinder andhaving a rod projecting therefrom, means operatively connecting the piston rod with the drum to provide for rotation of the drum upon movement of the piston, and means for admitting a pressure medium to one end of the cylinder to move the piston, said cylinder having an exhaust port adjacent but spaced from its opposite end to provide for the escape of excess pressure within the cylinder.

2. In an apparatus for winding a curtain on a drum to hoist the curtain, a pressure cylinder, a piston slidable within the cylinder and having a rod projecting therefrom, 13w.

sup-port secured to the outer end of the piston rod, a shaft .journaledin said support, a gear fixedly mounted on said shaft, a stationary rack having its teeth in mesh with said gear, means operatively connecting said shaft with said drum to provide for their rotation in unison, and means for admitting a pressure medium to one end of the cylinder to move the piston to rotate the gear, said cylinder the having an exhaust port adjacent but spacedw from its opposite end to provide for the escape of excess pressure within the cylinder.

3. In an apparatus for winding a curtain on a drum to hoist the curtain, a pressure cylinder, a piston slidable within the cylinder and having a rod projecting therefrom, a bracket secured to the piston rod externally of the cylinder, a guide member slidably supporting said bracket, means operatively connecting said bracket with said drum to provide for the rotation of the drum upon movement of the piston, and means for admitting a pressure medium to one end of the cylinder to move the piston, said cylinder having an exhaust port adjacent but spaced from its opposite end to provide for the escape of excess pressure within the cylinder.

In testimony whereof, I aflix my signature hereto.

J AGK B. MAPLES.