US1232475A - Safety attachment for air-brake systems. - Google Patents

Description

E. ARRINGTON.

SAFETY ATTACHMENT FOR AIR BRAKE SYSTEMS.

APPLICATION FILED JULY 28.19l5- LQ32A75 Patented July 10, 1917..

2 SHEETS-SHEET l.

E. ARRINGTON.

SAFETY ATTACHMENT FOR AIR BRAKE SYSTEMS.

APPLICATION FILED JULY 28,1915- 1,232,475. Patented July 10, 1917.

2 SHEETSSHEET 2.

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EUGENE ARRINGTON, OF RIDGELEY, WEST VIRGINIA.

Application filed July 28, 1915.

To all whom it may concern:

Be it known that I, EUGENE ARRINGTON, a citizen of the United States, residing at Ridgeley, in the county of Mineral and State of West Virginia, have invented certain new and useful Improvements in Safety Attachments for Air-Brake Systems; and I do hereby 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 to make and use the same.

This invention relates to new and useful improvements in safety attachments for air brake systems and the principal object of the invention is to provide a device which will avoid the necessity of tying down the brake when heavy grades are encountered.

Another object of the invention is to provide safety appliance which will materially increase the efficiency of ordinary air brakes and avoid muchof the danger encountered 1n the use thereof through the necessity of tying down the brakes.

A further object of the invention is to provide a device which willv hold the brakes applied until the pressure in the train line has been restored, thereby insuring the proper operation of the brake mechanism at all times.

With these and other objects in view, the invention consists in the novel combination 2 and arrangement of parts which will be fully set forth in the following specification and accompanying drawings, in which Figure 1 is a side view of a fragment of a car showing this improved attachment applied thereto.

Fig. 2 is a top plan view of the device showing portions thereof in section to more clearly illustrate the details of construction, and

Fig. 3 is a fragmentary view showing the manual releasing means in detail.

Referring now to the drawings by characters of reference, the numeral 1 designates the body of a car of the usual character mounted on the truck 2. Supported beneath the body of the car is the usual brake cylinder 3 carried on a suitable bracket 4 and slidable in the brake cylinder is the piston on which the plunger rod 5 is carried. This plunger rod is provided at its forward end with a suitable connection 6, to which the fulcrum arm 7 is pivotally mounted. This fulcrum arm has connected thereto at suit Specification of Letters Patent.

Patented July 18, 1917.

Serial No. 42,358.

able points the brake rods 8 and extending forwardly from the connection 6 is a suitable extension 9 carrying at its extreme forward end the ratchet bar 10 provided with the teeth 11. The extension9 is slidable in a suitable bracket 12 formed with the forwardly extending car 13, the. use of which will appear as the description proceeds.

Pivoted to the ear is a suitable lever 14: provided at its lower end with the pawl 15. Thislever is formed with a slot 16 in which the connecting pin 17 of the forward end of the piston rod 18 is slidable. This piston rod 18 is connected to a piston which is slidable in the cylinder 19 which in turn is mounted on the bracket 20, beneath the car body.

The train pipe is designated by the numeral 21 and is provided with a suitable T- connection 22 by means of which the pipe 23 is connected thereto, which pipe leads to the cylinder 19 of the safety appliance. A suitable spring 2 1 is contained within the cylinder 19 of the safety appliance and one end of said spring bears against the forward face of the piston, which is slidable therein, while the other end bears against the forward end of the cylinder, so that the spring will exert pressure in the direction opposite to the air entering the device through the pipe 23. I

In order to throw-the safety appliance out of operation manually in order that the cars may be used in switching, a shaft 25 is supported in a suitable bracket 26 secured to the under side of the car and this shaft is provided with a squared end 27 on which the cam 28 is mounted. This cam or extension 28 is positioned in such a way as to engage the arm 1&1 and the rotation of the cam is controlled by providing a lever 29, which is secured to the opposite end of the shaft. A suitable ratchet wheel 30 is mounted adjacent the lever 29 and is arranged to be engaged by the pawl 31, which is pivoted to a suitable bracket 32 and is provided with the weight 33, which is designed to pull the pawl 31 out of engagement with the teeth on the ratchet wheel 30 hereinbefore referred to.

It will be apparent from the foregoing that in use when the air is let from the train pipe, the air in the auxiliary reservoir will pass through the triple valve into the brake cylinder, thereby forcing the piston on the rod 5 outwardly. Simultaneously with this movement the bar 9 will move the ratchet auxiliary tank may be reduced and the pressure in the brake cylinder may reduce, the pawl will hold the brake applied as though the pressure remained the same. Upon allowing the air to again flow into the train pipe it will be seen that the pressure in the. cylinder 19 will increase thereby forcing the piston outwardly and moving the lever 14 into such a position as to lift the pawl 15 from engagement with the teeth 11, thereby releasin the ratchet bar 10 and permitting the brakes to return to their off position. In event that it is desired to throw the safety appliance to an inoperative position, it will be seen that upon lifting up on the lever 29 as indicated in the dotted lines in Fig. 1, the eccentric or cam 28 will engage the lever 14:, thereby lifting the pawl so that regardless of the position of the piston in the cylinder 19, the bar 10 will be free to move in either direction.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that such changes may be made in the combination and arrangement of parts as will fall within the spirit and scope of the appended claims.

lVhat is claimed is '1. In a device of the class described, the combination with an air brake system including a train pipe, a brake cylinder, a pis ton operable 1n the brake cyllnder and a piston rod connected to the piston, of a toothed bar connected to the piston rod, a pivoted pawl adapted to engage the toothed bar, a slotted arm formed integrally with and extending at right angles from said pivoted pawl, an auxiliary pressure cylinotally and slidably connected to the arm on the pawl, a spring normally tending to move the piston into the cylinder against the pressure of the air in the train pipe to cause the pawl to engage the toothed bar when the pressure in the train pipe is reduced in order to lock the piston rod of the brake piston in operative position and manual means for releasing the pawl.

2. In a device of the class described, the combination with an air brake system including a train pipe, a brake cylinder, a piston operable in the brake cylinder and a piston rod connected to the piston, of a toothed bar connected to the piston rod, a pivoted pawl adapted to engage the toothed bar a slotted arm formed, integrally with and extending at right angles from said pivoted pawl, an auxiliary pressure cylinder mounted over the toothed barand in communication with the train pipe, a piston operable in said auxiliary cylinder, a piston rod connected to the piston and pivotally and slidably connected to the arm on the pawl, a spring normally tending to move the piston into the cylinder against the pressure of the air in the train pipe to cause the pawl to engage the toothed bar when the pressure in the train pipeis reduced in order to lock the piston rod of the brake piston in operative position, a shaft journaled in close proximity to the arm on the pawl, a cam on said shaft arranged so that when the shaft is rotated the cam will move the arm to release the pawl, a lever for rotating said shaft, a toothed wheel on the shaft and a pawl for engaging the toothed wheel to prevent the shaft from being rotated in a reverse direction.v

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

EUGENE ARRING'ION.

Witnesses WV. J. I'IADRA, A. A. Amenrorrr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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