US503044A - Island - Google Patents

Description

2 Sheets-Shed; 1..

' (Nd Model.)

J. H. GRAHAM.

7 CAR TRUCK Patented Aug. 8,, 1893;

(No Model.)

- 2 Sheets-Sheet 2. J. H. GRAHAM UAR TRUCK Patented Aug. 8,1893.

UNITED STAT PATENT O ICE.

JOHN H. GRAHAM, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE CON- SOLIDATED RAILWAY SUPPLY COMPANY, OF SAME PLACE, AND OF PROVIDENCE, RHODE ISLAND.

- CAR-TRUCK.

SPECIFICATION forming part of Letters Batent No. 503,044, dated August 8, 1893.

Application filed February 6, 1893. Serial No. 461,279. (No model.)

To all whom it may concern:

Be it known that I, JOHN H. GRAHAM, of Boston, in the county of Suffolk, State of Massachusetts, have invented certain new and useful Improvements in Cars, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a top plan view of'my improved street-car truck; Fig. 2 a side elevation of the same; Fig. 3 a side elevation enlarged showing the pedestal and method of mounting the truck frame on the axles; Fig. 4 an edge elevation of the same; Fig. 5 a front elevation of one of the arch-bars; Fig, 6 elevation showing the arch-bar locking mechanism; Fig. 7 an end elevation of the castings connecting the frame and car-body; and Fig. 8 a side elevation of the pivot-block.

Like letters and figures of reference indicate corresponding parts in the different figures of the drawings.

My invention relates especially to improvements in trucks for electrically propelled street-cars, and a brake-mechanism therefor; and it consists in certain novel features hereinafter fully set forth and claimed, the object being to produce a simpler, cheaper and more efiective device of this character than is now in ordinary use.

The nature and operation of the improvement will be readily understood by all conversant with such matters from the following explanation: l

In the drawings, A represents the car-axles supported on wheels, B, and bearing journalboxes, 0, in the ordinary manner.

The truck-frame, D, is approximately rectangular and comprises a flat metallic-bar.

nally of the pedestal in which the frame, D,

rests and is secured bybolts, h. The pedestal is provided centrally with a transverse opening through which the journal-boxes, O, project.

Mounted centrally in a suitable clamp, j, secured on the top of the journal boxes between the side-plates, b, of the pedestal there is a half-elliptical spring, 7e, curved vertically upward and containing as many leaves as will afford sufficient rigidity for the purposes hereinafter described. At each end the side-plates, b, of the pedestal are connected by a'cuppedpiece, m, disposed vertically under the ends of the spring, lo, and provided with a central opening, 10, shown in'Fig. 3. A T-rod, q, is passed through said opening and through the end of the springJo. On the lower ends of saidrods and supported by their heads there are cups, 4". Resting in said cups and butting in the rigid cup, m, there are spirally-coiled springs, 25, of like tension in relation to the semi-elliptical spring.

The weight of the car-body on the truckframe, D, forcing the pedestals downward is cushioned by the coiled springsyt. As the load on the car increases these springs still serve to cushion it until their limit is reached when the downward pull on the T-rods, q, for any further increase of the load, is supported by the semi-elliptical springs, it. By this arrangement of parts and springs, all variations in the load on the car are cushioned eifecting a result not attainable by the coiled-springs in ordinary use which are of necessity so wound to resist the maximum load on the car 8 pivot-blocks, said blocks engaging within said 9 castings and forming the bearing-points of the car-body on the truck-frame. Bolts, 2, passing through the sides of the casting and the opening, 00, of the pivot-block head, secure the same together.

The motor, M, of which one or more may be employed in the ordinary way is supported from the axle, A, at one side and an arch bar, 15, connecting the side-bars of the truck frame, D. elevation in Fig. 5, pass through locks, 16, which are provided on their upper faces with a groove, 17, of size suitable to receive the side -bars of the frame. Flush with said groove the blocks, 16, are provided with laterally projecting flanges, 18. A dovetailed cap or locking block, 19, (see Fig. 6) receives the flanged heads of the blocks, 16, looking the frame therein. One of these arch-bars, 15, is employed for each motor. The blocks, 19, are held by bolts, 20, (see Fig. 2).

A brake-mechanism for the truck comprises a rock-bar, 21, supported and fitted. to rotate in brackets, 22, bolted to the frame, D, between the arch-bars. lock-bar as may be deemed preferable there are two cranks or levers, 23, fitted to swing vertically. A chain, 24, connects each crank or lever by an end with the ordinary brakestaif. The opposite end of said levers, 23,

are connected by rods, 25, with the brakebeam, 26, hung from the truck-frame in the ordinary manner. By this arrangement as the brake-staffs are actuated at their end of the car both brake-beams of the truck are operated simultaneously in manner which will be readily understood by all conversant with such matters without a more explicit description.

I do not confine myself to the use of coiled springs, t, as any form of spring of less tension than the semi-elliptical spring may be substituted therefor without departing from the spirit of my invention, the primary feature of which consists in so grading the springs supporting the car-body that the variations in the load may be compensated for.

springs of less resistance than the semiellip-j tical spring supported therefrom and a pedestal supported by said springs.

2. In a car-truck a semi-elliptical spring supported on an axle-box in combination with coiled springs supported from the ends there-, of and a pedestal supported by said coiled;

springs, substantially as described.

The ends of the arch-bar, shown in Fast or loose on said 8. In a car-truck the combination of a framesupporting pedestal; a semi-elliptical spring mounted 011 the car-axle; rods pendent from the ends of said spring; coiled springs supported by said rods and carrying said pedestal.

4:- In a car-truck, the combination'with the semi-elliptical spring secured to the axle-box, of the T-rods pendent therefrom, the coiled springs supported on said rods and the pedestal supported by said springs.

5. The pedestal, H, flanged to receive the truck-frame in combination with the semielliptical spring, 70, supported on an axle-box; rods pendent from the ends of said spring; coiled springs mounted on said rods and supporting said pedestal.

6. The combination with the wheels, axle and journal-boxes of an inverted semi-elliptical spring supported on said boxes, coiledsprings supported from the ends of said semielliptical spring and the pedestal, H, bearing on said coiled springs and supporting the truck-frame.

7. In a car-truck, the pedestal, H, provided with the groove, 9, in combination with the frame, D, secured in said groove; the semielliptical springs, 70, mounted centrally on an axle-box; the rods, q, pendent from the ends of said springs and the coiled-sprin gs mounted on said rods and supporting said pedestal substantially as described.

8. In a car-truck, an electric-motor connected with an axle of said truck; flanged locks grooved to receive the truck frame; dovetailed blocks for locking said frame therein and an arch-bar mounted in said flanged-box and supporting said motor.

9. In a car-truck, the combination with the frame of the flanged blocks, 16; the dovetailed blocks, 19,for locking said frame therein and the arch-bar, 15, supported in said block, 16, substantially as and for the purpose set forth. Having thus explained my invention, what 10. The combination with a ear-body of a truck-frame; vertically curved pivot-blocks on said frame and bearings for said blocks on the car-body.

11. The combination with a car-body of a truck; the pivotblocks, v, on the frame of said truck; the castings, g on said car forming steps for said blocks and secured thereto.

JOHN II. GRAHAM.

Witnesses:

K. DURFEE, O. M. SHAW.

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