US1695086A

US1695086A - Railway-car truck

Info

Publication number: US1695086A
Application number: US216512A
Authority: US
Inventors: James R Cardwell
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-08-31
Filing date: 1927-08-31
Publication date: 1928-12-11
Anticipated expiration: 1945-12-11

Description

Dec. 11

J. R- CARDWELL RAILWAY CAR TRUCK Filed AUB 51. 1927 2 Sheets-Sheet 1 Dec. l1, 1928.l

J. R. cARDwELL RAILWAY CAR TRUCK 2..Sheets-Sheet 2 Filed Aug. 31. 1927 Patented Dec. 1l, 1928i.

UNITED STATES JAMES R. CARDWELL, 0F CHICAGO, ILLINOIS.

RAILWAY-CAB TRUCK.

` Applimitionl lel August 31, 1927. Serial No. 216,512.

The invention relates to railway car trucks of the type in which the truck bolster is yieldingly supported in part by friction elements.

' The object of the invention is to relieve, 1n great measure, the side frame of the truck y from the spreading action of the friction ele- `ments; and it consists in a structure as hereinafter described and as illustrated in the accompanying drawings, in which Fig. 1 is a side elevation of the car .truck embodying the invention; A

Fig. 2 is a detail vertical longitudinal section of the truck side frame, some parts being shown in elevation;

Fig. 3 is a detail section on the line 3 3 of Fig. 1; l

Fig. 4 are views in perspective of the several movable friction elements of the device; and

Fig. 5 is a view in perspective of the tray.

containing such movable elements.

The device is, in many of its features, like that forming the subject of my application Ser. No. 216,511 filed concurrently with thls;

-' the essential difference being that in the present instance the stationary wedging elements are carried by or, as shown, incorporated into a tray of sufficient strength to sustain all or much of the lateral stresses transmitted through the movable wedgingelements.

In the accompanying drawings there is shown at 10 the side frame, in arch form, of a car truck, and at 11, 11, a pair of supporting wheels. The truck bolster of the car is shown at 12, and, as usual,each of its ends is supported by springs 13, the bolster having vertical movement between a pair of columns or guide bars 14, 15, which form parts of the side frame of the truck.

In practice heretofore revailing these springs have been. seated directly Aupon the lower arch 16 of the truck, which connects the lower ends of the columns 14, 15. The present invention provides for the introduca tion between these springs and the member 16 of a series of wedging elements.

Such elements comprise a tray 17, of suitable form to iit between the columns 14, 15, and to rest upon the member 16, being held in place as by means of downwardly projecting flanges 18, which embrace the side margins of this member.

The inner face of the end walls of the tray are inclined, as shown at 19, to form wedge faces. Seated within the tray are a pair of wedge blocks or

bars

20, 21, which, in crosssection, take the form of inverted truncated cones. These

elements

20, 21, form the seats for the lower ends of the springs 13.

A pair of

blocks

22, 23, triangular in crosssection, and preferably equilateral, are interposed between the

members

20, 21, bearing, respectively, against the inner inclined face of each. Interposed between, and bearing directly upon the

elements

22, 23, is .a double faced wedge element 24, having an upwardly pro'ecting stem 25, which extends into a poc zet 26 formed ina rib 27 depending from the bolster 12. A spring 28, here shown as being in leaf form, is interposed between the upper end of the stem 25 and the inner end of the pocket 26.

In the normal position of the parts, as

shown in Fig. 2, the flattened shorter or end faces of the

elements

20, 21, are seated upon the bottomof the tray 17, their outer inclined faces resting against the inclined faces 19 of the tray; the

wedge elements

22, 23, are seated upon the bottom of the tray, each engaging an inclined face of one ofthe elements 20,' 21; the wedge element 24 is seated against the adjacent faces of the

elements

22, 23, and the spring 28 urges all of these wedge elements into close contact.

Any slight shocks in vertical direction will cause the relative approach of the

members

12 and 16, correspondingly compressing the springs 13. Shocks which are of sufficient force to completely compress the spring 28 move the element 25 downwardly, thereby spreading the

blocks

22,23 apart and forcing the blocks 20,- 21, upwardly, by a wedging action, against the resistance ofthe springs 13. When the member 24 engages the bottom of the tray 17, further downward movement of the bolster 12 is arrested. The parts are so proportioned that the possible downward movement of the bolster is within the compressive limit of the springs'13,thereby relieving them from full compression, and hence greatly reducing the tendency to impart to them a permanent set. v

.The tray "17 may t snugly between the columns 14, 15, but inasmuch as in the manufacture of devices of this kind machining is to be avoided, itbecomes impracticable to insure positive engagement of the ends of the.

tray with the columns. The tray is made of sucient strength to resist lateral stresses im- Upon the recoil the springs 15 return all of the movable wedging elements to their normal position, as shown in Fig. 2.

The stresses of the more severe shocks are largely absorbed by the friction between the several wedge faces and between the

blocks

22, 23, and the bottom of the tray. The lateral stresses due to the spreadin action of the central member 24 are resiste by the side and bottom webs of the tray 17.

The described embodiment of the invention is simple and eiiicient, but it may take various other forms, as for adapting it for use in connection with other types of truck frames.

I claim as my invention:

l. In a car truck, an end frame, a bolster, springs for supporting the bolster, a. pair of wedge blocks havin backwardly and upwardly inclined We ging faces carried by the frame, means connecting such blocks together to resist spreading stresses, double faced wedging elements engaging such faces and forming seats for the springs, a pair of triangular wedge blocks each engaging a face of the last named blocks, and a spreading wed e interposed between the triangular bloc s and having a stem engageable by the bolster.

2. In a car truck, in combination, a frame having columns and a lower arch, a bolster slidingly engaging the columns, a tray supported by the arch and having upwardly and outwardly inclined wedginff faces adjacent to its ends, a pair of double faced wedge blocks engaging the wedging faces of the tray, a pair of triangular wedge blocks seated in the tray and engaging respectively the first named blocks, a double faced wedging element interposed between the triangular blocks and having a stem engageable by the bolster, and springs reacting between thebolster and the first named blocks.

3. In a car truck, an end frame, a bolster, springs for supporting the bolster, outwardly and upwardly inclined wedging faces carried by the frame, double faced wedging elements engaging such faces and forming seats for the springs, a pair of triangular wedge blocks each engaging a face of the Iirst named blocks, and a spreading wedge interposed between the triangular blocks and having a stem engageable by the bolster, and a spring interposed between the stem and the bolster.

4. A tray for containing a system of wedging elements in a railway car truck and having upwardly and outwardly inclined wedging faces.

' In testimony whereof I aiiix my signature.

JAMES R. CARDWELL.