US1804300A

US1804300A - Graduated semielliptic spring

Info

Publication number: US1804300A
Application number: US437502A
Authority: US
Inventors: Walter S Adams
Original assignee: J G BRILL CO
Current assignee: JG Brill USA Co
Priority date: 1930-03-20
Filing date: 1930-03-20
Publication date: 1931-05-05
Anticipated expiration: 1948-05-05

Description

y 5, 3 w. s. ADAM? 1,804,300

GRADUATED SEMIELLIPTIG SPRING Filed March 20, 1930 2 Sheets-Sheet 1 May 5, 1931.

w. s. ADAMS GRADUATED SEMI ELLIPTIC SPRING 2 Sheets-Sheet 2 Filed March 20, 1930 4 auxiliary springs.

Patented May 5, 1931 UNITED STATES PATENT oFrncE I WALTER S. ADAMS, F PHILADELPHIA, PENNSYLVANIA, ASSIGN'OR TO THE 3. G. BRILL COMPANY, OF FHILADELIHIA, PENNSYLVANIA, A. CORPORATION VANIA 0F PENNSYL- GRADUATED SEMIELLIP'IIC SPRING Application filed March 20, 1930. Serial No. 437,502.

This invention relates to car trucks, and more particularly to the car trucks of street railway cars.

An important object of the invention is the provision in a car truck construction of spring means connecting the bolster and truck frame of such character and so connected with the frame and the axles that a greater bearing of the journal box on the axle is obtained.-

A still further object of the invention is the provision of a structure of this character embodying primary and auxiliary springs at each side of the truck, these springs being so arranged that the auxiliary spring carries no load during ordinary loading of the car and only comes into play when the car is loaded to a point approaching its maximum capacity.

A still further object of the invention is the provisionof a structure preventing the trou les ordinarily occurring when the normal load-supporting spring breaks.

These and other objects I attain by the con-.

2 struction shown in the accompanying drawings wherein, for the' purpose of illustration, I have shown a preferred embodiment of my invention and wherein:

V Fig. 1 is a fragmentary ,plan view of a truck embodyin my invention;

Fig. 2 is a si e elevation thereof; and

Fig. 3 is a sectional view illustrating the sprin mounting on the bolster.

Re erring'now more particularl to the drawings, the numeral 10 general y designates a truck bolster; 11, wheel axles; and 12, the journal boxes thereof. The journal boxes are made wider than in the ordinary construction and are provided with a flat upper surface 13. Adjacent each side thereof th bolster 10 is provided with a horizontally-extending flat surface 14 providing a seat for a pair of inverted semi-elliptic springs 15 and 16 hereinafter referred to as mam and 7 These springs, as in the usual construction, are centrally banded at 17 and the surface 1* is recessed as at 18 to reeeivethasehands.

A yoke 19isprovided foreaeh bani;

II of springs 15 -16, this yoke being its inner end to the bolster as at .20, extending upwardly and over the spring 16 in spaced relation thereto and is then provided with a downwardly oflset portion 21 abutting against the upper surface of the spring 15 to clamp thcsame againstthe bolster. This end of the yoke is secured by bolts 22, and other bolts 23 preferably connect the yoke adjacent the offset with the bolster, these latter bolts passingbetween springs15 and 16. ends of springs15 and 16 seat uponthe journal boxes 12 between'outer faces 13 thereofi and are held thereagainst by a superimpose plate 24, bolted to the journal box by bolts 25 serving. to maintain the proper spaced relation of the ends of springs 15 and 16 and.

to' hold these sprin s in proper alignment. It will be obvious tli at the use of the air of springs provides a wider seating sur ace so that a greater bearing of-the journal box upon the axle is provided and the tendency to roper alignment is promoted. When spring 15 has been sufiiciently compressed, the spring 16 will engage against the under surface of the portion 19 of the yoke and compression of this spring will begin, spring 16 from this point on complementing sprm 15 in its action. 7

Since the specific arrangement here1nbefore set forth is obviously capable of a considerable range of change and modification without in any spirit of understood as limiting myself thereto except as hereinafter claimed.

I claim:

1. In a car truck, spaced axles and an intermediate bolster, the axles having aligned journal boxes providing relatively wide seats upon their upper sur aces, a pair of leaf springs arranged in side to side relation secured at their ends to said journal boxes and at their centers operatively engaging said bolster, one of said springs being rigidly fixed to said bolster and means carried by the bolster and co-acting with the other spring to engage and flex the said other spring when the bolster has been depressed to a predetermined extent against the action of the first-named spring.

The outermanner departing from the my invention, I do not wish to be 7 face of one of said springs and a second por- 2. A truck comprising parallel axles having relatively wide faced journal boxes at opposite ends thereof and a pair of parallel leaf springs disposed at each side of the truck and having their ends rigidly secured to the said journal boxes.

3. A truck comprising arallel axles having relatively wide faced journal boxes at opposite ends thereof, a pair of parallel leaf springs disposed at each side of the truck and having their ends rigidly secured to the said journal boxes, a bolster extending transversely of the truck at the approximate center thereof, and means on said bolster engaging the upper surface of one of said sprmgs and vertically-spaced from the upper surface of the other of said springs.

4. A truck comprising (parallel axles having relatively wide face journal boxes at opposite ends thereof, a pair of parallel leaf springs disposed at each side of the truck and having their ends rigidly secured to the said journal boxes, and a bolster extending transversely of the truck at the approximate center thereof, including a. member having a portion directly engaging the upper surtion vertically oflset with relation to the first-named portion and extendin over the other of said springs in spaced relation thereto. a

5. In a car truck, spaced axles, an inter mediately disposed bolster and a pair of sprin 's connecting the axles adjacent each end thereof and supported thereby, one of said springs at each side of the truck supporting the bolsterunder normal loads, the

other of said syirings assisting to support the bolster under a normalloads and supporting the bolster in event of. breakage of thefirstnamed springs, said springs each comprismg a leaf spring, the s rings at each end of :1: axles being spaced ongitudinally of the WALTER s.

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