US404339A - Locomotive-driver brake - Google Patents

Description

(No Model.)

G. A. BOYDEN. LOGOMOTIVE DRIVER BRAKE.

Patented May 28, 1889.

Inveviaor: Georga/q 9A1; Jlairng Wtinessesi .Eoyden.

R. PETERS. PMio-Uflwgnpher, Wismngion. D. C.

- UNITED STATES PATENT OFFICE.

GEORGE A. BOYDEN, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE BOY- DEN POYVER BRAKE COMPANY OF BALTIMORE CITY, OF MARYLAND.

LOCOMOTIV'E-IDRIVER BRAKE.

SPECIFICATION forming part of Letters Patent No. 404,339, dated May 28, 1889.

Application filed January '7, 1889. Serial No. 295,625. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. BOYDEN, a citizen of the United States, residing at Baltimore, in. the State of Maryland, have invented certain new and useful Improvements in L0- comotive-Driver Brakes; andI do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains I0 to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in the driver-brakes of that class of locomotives known as the consolidated type; and it consists of such combination, arrangement, and operation of the various parts that the brake mechanism will be so self-adjusting as to accommodate itself to any intermobility of the locomotive, and thus under all conditions apply an equal brake force to each driverwheel thereof, all of which I accomplish by the devices hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a side. elevation in full of the device, showing the manner of attaching to the locomotive and applying the brake-power 0 to the drivers thereof. Fig. 2 .is a view in full looking down on the brake'beams and rods. Fig. 3 is a detailed view of the adjusting mechanism, shown somewhat enlarged.

The same figures refer to the same or simi- 5 lar parts throughout the several views.

The figure at denotes a locomotive that is provided with the drivers 5 5 5, to which the brakes are to be applied. Secured to the engine-frame 8 are the cylinders 9, one of which .|o is placed 011 each side of the locomotive, with their axes horizontal, each of these cylinders being provided with a piston and piston-rod, 10, by which the power from the boiler or from the air-tank may be transmitted to the brake mechanism, the pressure beingadmitted through the engineers valve to the back of the pistons, which will be pushed outward to the position shown in Fig. 1, and the brakes will be applied, the weights of the various parts serving by gravity to move the pistons back and release the brakes when the pressure is released from the piston.

In traveling over a rough and uneven railroad-track there is always a certain amount of undesired intermobility between the parts of the locomotive. This is particularly manifest in the relative movement between the driver-centers, and unless some provision be made by which the brake-shoes will accommodate themselves to this difference of movement of the driver-centers an unequal brakepower will be applied by the different brakeshoes. With this in view the following appliances are employed whereby an equal brake-power will be applied to. each brakeshoe and the power will be equally distributed to all the drivers of the engine and any unequal strain upon the parts thereof avoided.

Suspended from the frame 8 on each side of the locomotive and in front of the drivers are the links 11, which'are free to be vibrated on their pivots 12, each of these links having fulcrumed thereto the brakehead 13, the shoe 14 of which will be brought in contact with or released from the tire of the driver 7 by the vibration of the said link. Pivoted to the free ends of the links 1.1 are the ends 15 of the beams 16, whereby the shoes that are opposite one to the other are connected. Placed on top of these beams and secured 8o thereto are the pulling-heads 17, that are made of-some suitable metal and are provided with an opening therethrough in which may freely move the rod 18, this rod on one side of the pulling-head being provided with a collar, 19, which serves as'a stop in one direction to the movement of the said rod through the pullinghead, the said rod being provided on the other side of the pulling-head with the adjustable nuts 20, between the under side of which and go the said pulling-head is placed the spring 21, whereby when the said rod 18 is drawn to the left by the movement of the piston-rod 10 and the intermediate lever, 22, such pressure will be imparted to each beam and its attached link 11 and shoes 14 as is due to the tension on the spring 21 between the nuts 20 and pulling-head 17, this tension being set at any desired point by the adjustment of the nuts 20,

which for this purpose are threaded to the I0O rods 18, whereby when the shoes are drawn against the tires of the drivers in the manner described the elasticity of the springs 21 will permit such free movement to the rods 18 that an equal brake-pressure will be applied to each driver of the locomotive.

In Fig. 2 there are shown two rods, 18, one being placed on each side of the beam 16, this being deemed the best arrangement for the proper distribution of the brake-power. By the employment and arrangement of the beams 16 as specified, however, but one rod, 18, may be used, in which case the pullinghead will be placed centrally on the beam 16, and the rod 18 pulling thereon in the manner described will equally distribute the brakepower to the drivers on each side.

In order that a further adjustment may be provided the rods 18 and the attached parts, the said rods are made in sections that are united by the right and left nuts 24, by which the relative distances between the different brake-shoes may be increased or diminished, as desired.

Having described my invention and the manner of operating, whatI claim, and desire to secure by United States Letters Patent, is-

1. In a car or locomotive brake, the combination, with the brake-rods 18, of the pulling headed beams located behind each set of wheels, the adjustable springs, and the links 11, pivoted to the beam, shoe, and frame, substantially as specified.

2. In a car or locomotive brake, the combination of the suspending-links 11, two or more brake-heads, 13, the rod 18, the springs 21, and a cylinder and piston to actuate the said rod 18, for the purpose set forth.

3. In a car or locomotive brake, the combination of the suspending-links11, two or more brake-heads, 13, the rod 18, the springs 21, and the pulling-heads 17,in which mayfreely move the said rod 1S,for the purpose set forth.

4. In a car or locomotive brake, the combination of two or more sets of brake-heads arranged to bear against the wheels, the rod 18, connected to the said brake-heads, and a spring, 21, interposed between the said rod and the brake-heads, whereby an equal brake-tension will be placed on each brake-shoe, for the purpose set forth.

5. In a car or locomotive brake, the combination of two or more brake-heads arranged to bear against the wheels, the cross-beams 16, connected to the brake-heads, the rodlS, moving freely on the said beams, the spring 21, interposed between thesaid rod and the said beam, and a cylinder and piston for imparting movement to the said rod 18, for the purpose set forth.

6. In a car or locomotive brake, the combination of two or more brake-heads, 13, placed relatively on the same side of each wheel and connected one with the other, and springs 21, located on the said connection, whereby an equal brake-pressure will be applied to each brake-shoe when forced against the wheels, for'the purpose set forth.

7. In a car or locomotive brake, the combination of two or more brake-heads, 13, placed relatively on the same side of each wheel and connected one with the other, springs 21, located in the said connection,whereby an equal brake-pressure will be applied to each brakeshoe when forced against the wheels, and a cylinder and piston for imparti'n gpower to the said brake-shoes, for the purpose set forth.

8. In a car or locomotive brake, the combination, with the brake-rods 18, of the brakebeams secured to said rods directly behind each set of wheels, the springs 21., mounted on the rods 18 and having bearings against the said beams and the nuts 20, the links pivoted at their ends to the frame of a car or locomotive and to the brake-beams, respectively, and the shoes pivoted to the links between their ends, substantially as specified.

In testimony whereof I afiix my signature in presence of two witnesses.

(.tEORGE A. BOYDEN.

\Vitnesses:

WM. L. BAILIE, JNo. T. MAonoX.

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