US2238593A - Railway truck - Google Patents

Description

A ril 15, 1941. 0. K. KJOLSETH RAILWAY TRUCK Filed Dec. 28, 1939 Inventor: Ole K. KJolsech,

b y Hi Attorn ey.

Patented Apr. 15, 1941 RAILWAY TRUCK Ole K. Kjolseth, Erie, Pa., assignor to General Electric Company; a corporation of New York Application December 28, 1939, Serial No. 311,305

12 Claims.

My invention relates to railway guiding trucks.

An object of my invention is to provide an improved railway guiding truck having a laterally movable bolster supporting a center bearing which is adapted to be actuated by the weight carried thereby to exert a centering force on the bolster.

Another object of my invention is to providean improved railway truck having a three-point support for a laterally movable bolster to restrain tilting thereof and to restrain lateral movement and to center the bolster relative to the truck frame.

Further objects and advantages of my invention will become apparent and my invention will be better understood from the following description referring to the accompanying drawing, and the features of novelty which characterize my invention will be pointed out with particularly in the claims annexed to and forming part of this specification. 1

In the drawing, Fig. 1 is a side elevational viewof a railway truck embodying my invention, partly broken away to show the relative arrangement of the centering device; Fig. 2 is a plan view of the truck shown. in Fig. 1, partly broken away to illustrate the centering device; Fig. 3 is a sectional view taken along line 33 of Fig. 2; Fig. 4 shows the centering arrangement illustrated in Fig. 3 with the bolster displaced laterally with respect to the truck frame; and Fig. 5 is an enlarged side view of one of the centering cam blocks.

Referring to the drawing, I have shown my invention in connection with a two-axle guiding truck having a pair of axles [0 provided with wheels II and outside journal boxes 12 on which the truck frame is supported. This truck frame is provided with side frames 13 connected together at the ends thereof by transversely extending end frames I4 and adjacent the central part by transversely extending elements or transoms l5. In order to provide a resilient support 7 for the truck frame on the axles HI, leaf springs l6 are supported intermediate the ends thereof on the journal boxes I 2 and are connected at each inner end by links H to an equalizer l8 secured to the side frames and at' each outer end to the side frames l3 by links Ila. These links frames also are provided with pedestal jaws 2|, which slidably engage journal boxes l2 and are connected together at their lower ends by tie bars 22. A laterally movable bolster 23 is arranged intermediate the two transoms 15 between stops 24, which limit its upward movement, and is provided with a center bearing plate 25 on which the locomotive or car may be supported by a center pin 26. Longitudinal forces are transmitted between the bolster and the truck frame through bearing surfaces 21 arranged on each side of the bolster and secured to the transoms l5.

Lateral movement of the bolster is restrained by a gravity centering device of the general type shown in my Patent 1,751,336, assigned to the General Electric Company, assignee of this application, although other lateral restraint devices also may be used. In my present construction, this centering device comprises cam blocks 28 having oppositely inclined curved cam surfaces 29, which are arranged between the bolster and the truck frame and secured to the under side of the bolster and the upper side of the transom, and rollers 30 which engage the inclined camsurfaces at three spaced apart places about the center of the bolster as shown in Fig. 2 and transmit the weight on the bolster to the truck frame, The cam surfaces are more clearly shown in Fig. 5 and comprise surfaces which slope in opposite directions and are inclined with respect to the bolster. The curvature of these cam surfaces is such that a predetermined maximum centering force is provided with the rollers engaging the central portion 3| thereof, and the restraining force gradually decreases with lateral displacement of the bolster and the rollers with respect to the truck frame. These cam blocks 28 are arranged in spaced apart pairs on each side of the center bearing 25, and each pair includes an upper and a lower block, as shown in Figs. 3 and 4. The rollers 30 also are arranged in pairs on each side of the center bearing 25, and on one side of the center bearing 25 two rollers 30 are longitudinally spaced apart and rotatably mounted upon a supporting pin 32 to provide two supporting points, while on the other side of the bearing 25, the two rollers are mounted in closely adjacent relationship upon a pin 3-3 to provide substantially a single point of support. In this manner, the bolster 23 and the center bearing 25 are provided with substantially a three-point support upon the truck frame by the rollers 30 and the cam blocks 28 to minimize tilting thereof relative to the truck frame. In

order to insure symmetrical movement of the rollers 39, the supporting pins 32 and 33 for these rollers are mounted upon a transversely extending frame, which includes a pair of side elements 34 connected together by a transversely extending element 35 to provide a completely interconnected gravity roller centering device. It is desirable that the rollers 39 maintain a predetermined relation to the cam elements for predetermined relative positions of the bolster and the truck frame. This relationship is obtained by connecting the roller frame to the bolster and to the truck frame by a linkage including an upwardly extending link 36 pivotally secured by a pin 37 to roller frame elements 38, which are rigidly secured to the transversely extending roller frame member 35. This upwardly extending link 3% extends through an opening 23a formed in the bolster 23 and is pivotally connected at its upper end to a link 39, which is pivotally connected to the upper side of the bolster" 23. The lower end of the link 36 extends through an opening 50 formed in a transversely extending plate M secured to the transoms i5, and is pivotally connected to .a link 52, which in turn is pivotally secured to an ear 43 rigidly mounted upon the plate M. This linkage insures the movement of the interconnected rollers in direct proportion to the lateral movement of the bolster 23 with respect to the truck frame. Thus, lateral movement of the bolster with respect to the truck frame tends to cause the rollers to travel upwardly on the cam surfaces 29 and raise the bolster as shown in Fig. 4:. This necessitates exerting an upward force to raise the weight carried by the center bearing and tends to cause the rollers to move toward the central portion 3! of the cam blocks and return the bolster and center bearing by gravity to centered position.

While I have illustrated and described a particular embodiment of my invention, modifications thereof will occur to those skilled in the art. I desire it to be understood, therefore, that my invention is not to be limited to the parl ticular arrangement disclosed, and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is:

'1. A railway truck having a truck frame, a laterally movable bolster, spaced apart cam surfaces arranged between said bolster and said truck frame, and means arranged to cooperate with said cam surfaces at three places for providing substantially a three-point support for said bolster on said truck frame arranged to restrain lateral movement of said bolster with respect to said truck frame.

2. A railway truck having a truck frame, a laterally movable bolster, surfaces inclined with respect to said bolster arranged between said bolster and said truck frame, and means arranged to cooperate with said inclined surfaces at three places spaced apart about the center of said bolster for providing substantially a three point support for said bolster on said truck frame arranged to restrain lateral movement of said bolster with respect to said truck frame.

3. A railway truck having a truck frame, a laterally movable bolster, surfaces inclined with respect to said bolster arranged between said bolster and said truck frame, and means including a movable member engaging said inclined surfaces at three places spaced apart about the center of said bolster for providing substantially a three-point support for said bolster on said truck frame arranged to restrain lateral movement of said bolster with respect to said truck frame.

4. A railway truck having a truck frame, a laterally movable bolster, a plurality of spaced apart cam surfaces, a plurality of rollers, and means including the arrangement of said plurality of rollers in engagement with said cam surfaces at three spaced apart places for providing substantially a three-point support for said bolster arranged to restrain lateral movement of said bolster relative to said truck frame.

5. A railway truck having a truck frame, a bolster, a plurality of spaced apart cam surfaces arranged between said bolster and said truck frame, a plurality of rollers, and means including the arrangement of said plurality of rollers in engagement with said cam surfaces at three spaced apart places for providing substantially a three-point support for said bolster on said truck frame arranged to restrain later-a1 movement of said bolster relative to said truck frame.

6. A railway truck having a truck frame, a laterally movable bolster, a plurality of surfaces inclined relative to said bolster, a plurality of rollers, and means including the arrangement of said plurality of rollers in engagement with said surfaces at three spaced apart places for providing substantially a three-point support for said bolster arranged to restrain lateral movement of said bolster relative to said truck frame.

7. A railway truck having a truck frame, a center bearing, a plurality of cam surfaces arranged between said center bearing and said truck frame, a plurality of rollers, and means including the arrangement of said plurality of rollers in engagement with said cam surfaces at three spaced apart places for providing substantially a three-point support for said center bearing on said truck frame arranged to restrain lateral movement of said center bearing relative to said truck frame.

8. A railway truck having a truck frame, a laterally movable bolster, a plurality of cam surfaces arranged between said bolster and said truck frame, a plurality of rollers, means in-, cluding the arrangement of said plurality of rollers in engagement with said cam surf-aces at three spaced apart places for providing substantially a three-point support for said bolster arranged to restrain lateral movement of said bolster relative to said truck frame, and means including a linkage connected to said bolster for moving said rollers relative to said cam surfaces on lateral movement of said bolster relative to said truck frame.

9. A railway truck having a truck frame, a laterally movable bolster, a plurality of surfaces inclined relative to said bolster arranged between said bolster and said truck frame, means including a plurality of interconnected rollers arranged between said bolster and said truck frame in engagement with said inclined surfaces at three places spaced apart about the center of said bolster for providing substantially a three-point support for said bolster on said truck frame arranged to restrain lateral movement of said bolster relative tosaid truck frame, and means including a linkage connected to said bolster and to said truck frame for moving said rollers relative to said surfaces on lateral movement of said bolster relative to said truck frame.

'10. A railway truck having a truck frame, a laterally movable bolster, surfaces inclined with respect to said bolster arranged between said bolster and said truck frame, means including a movable member engaging said inclined surfaces at three places for providing substantially a three; point support for said bolster on said truck frame arranged to restrain lateral movement of said bolster with respect to said truck frame, and a linkage connected to said truck frame and to said bolster for moving said member relative to said inclined surfaces on lateral movement of said bolster with respect to said truck frameJf .-11. A railway truck having a truckframe, a l-aterally.movable bolster, curved cam surfaces arranged between said bolster and said truck frame, means including a movable member engaging said cam surfaces at three places spaced relative movement therebetween, and a linkage connected to said truck frame and to said bolster for moving said member relative to said cam surface on lateral movement of said bolster with respect to said truck frame.

I12. A railway truck having a truck frame, a

laterally movable bolster, a plurality of curved cam surfaces arranged between said bolster and said truck frame, means including a plurality of interconnected rollers arranged between said bolster and said truck frame in engagement with said cam surfaces at three places for providing substantially a three-point support for said bolster on said truck frame arranged to provide a predetermined restraining force to lateral movement of said bolster relative to said truck frame for a predetermined relative movement therebetween and substantially no restraining force for further relative movement, and means including a linkage connected to said bolster and to said truck frame for moving said rollers relative to said surfaces on lateral movement of said bolster relative to said truck frame.

OLE K. KJOLSETH.

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