US1213363A - Air-brake attachment. - Google Patents

Description

uNrrED sTATns ra'rnur cerros.

MURRAY HENRY, F ALEXANDRIA., LOUISINA, ASSIGNOR 0F ONE-HALF T0 JGSEPH GEBHARDT, 0F ALEXANDRI. LOUISIANA.

.em-:BRAKE ATTACHMENT.

Specicaton of Letters Patent.

Application filed May 25, 1916. Serial No. 99,843.

To all rwhom t may concern Beit known that I, MURRAY HENRY, a citizen -of the United States, residing at Alexandria, in the parish' of Rapides and State of Louisiana, have invented certain new and useful Improvements in Air-Brake Attachments, of which the following is a specification.

My invention relates to improvements in means for automatically locking the brakes of a vehicle, such as a railway oar, in the set position, upon the application of the air pressure. v

An important object of the invention is to provide means of the above mentioned character, which are adapted to he installed upon or applied to the ordinary vor standard brake mechanism, without materially altering the construction thereof.

A'further object of the invention is to provide means of the above mentioned character, adapted for connection with the exhaust port of the standard or ordinary7 triplel valve, to be actuated by pressure escaping from the exhaust.

A further object of the invention is to provide apparatus of the above mentioned character, which is simple in construction, inexpensive to manufacture, strong, durable, and reliable in operation.

Other yobjects and advantages of the invention will be 'apparent during the course of the jollowing deseription.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts "throughout the same, Figure 1 is a v central vertical longitudinal sectional view through apparatus embodying the invention,

Fig. 2 is a transverse sectional view taken on line 2-2 of Fig. 1, and, Fig. 3 is a horizontal sectional view taken on line 3 3 of Fig. 2.

`In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 designates a brake cylinder, ordinarily arranged beneath a railway car or the like. Mounted to reciprocate within the brake cylinder 5 is a brake piston 6, having a tubular piston rod 7 connected therewith. This piston rod operates through an opening 8 formed in a tubular extension 9 of a, head 10. The head lIn order that the tubular piston `rod 7 may not turn upon its longitudinal axis, lit 1s provided with a longitudinally extending spline or rib 11, operating in a lgroove `12, formed in the tubular extension 9, as shown. Surrounding the piston rod 7 is a compressible coil spring 13, serving to return the piston 6 to its normalposition. The tubular piston rod 7 is provided upon its upper portion with a longitudinal set of ratchet teeth 14, which do not lock with the wall of the opening 8. Extending upwardly from the forward end of the tubular extension 9 is a vertical guide casing 15, preferably integral therewith. Mounted to slide in this guide casing is a vertically reciprocatory pawl 16,

the lower end of whichis beveled, as shown'k latented J an.23, 1917;

with extensions or flanges 18, projecting into y pockets 19, and contacting with balls 20 therein, as ,shown ll'h'e upper ends of the pockets 19 may be suitably closed to prevent` the Descape of these balls. The pawl 16 is moved dcwnwardlyby a spring 21, which engages o, cross-head 2h22, attached to the upper end of the guide casing 15, as shown.

From the oregoing description it is apparent that when the tubular piston rod. 7 is moved forwardly, the pawl 16 will automatically move downwardly, trip upon the teeth 14 and loclr the piston 16 against returning movement prior to' the upward releasing movement of the pawl.

The pawl 16Lis moved upwardly by a bellcranl; lever 23, pivoted to a stationary support 24, shown at 25. One arm vofthis bell crank lever projects into an opening -2S formed in the pawl and thereby has a loose pivotal connection therewith. The lower end of the' opposite arm of the bell crank lever is preferably 'forked and provided with longitudinal slots 27, receiving a pivot element or rod 23, extending through the -end of the piston rod 29. This piston rod extends through a head 30, formed upon a lock-cylinder 31. as shown.' This lock-cylinder is preferably formed integral with the head 10. Mounted to reciprocate within the lock-cylinder 31 is a lock-piston 32, having connection with the rod 29. A suitably coil spring 33 surrounds the rod 29 and Vserves to return the lock-piston 32 to its normal starting position. It is thus ap- Anected with the triple valve is a pipe 37,

l23 to be turned upon its pivot for moving the pavvl 16 out of engagement with the teeth 14.

The numeral 34 designates an auxiliary reservoir, Vof the usual construction, connected with an ordinary triple valve 35, in the usual manner. This triple valve has connection with a train line pipe 36. Conwhich supplies pressure to the cylinder 5, as shown. Leading into the exhaust of the triple valve 35 is a pipe 38, having communication with a port 39, 'discharging into the lock-cylinder 31. A T-coupling 10 is preferably connected in the pipe 38 and has a permanentlyopen port or .vent 41, which is reduced, and preferably having a diameter of one-third of the diameter of the bore of the pipe 38. The function of this T-coupling and its contracted port is to provide means whereby the loclepiston 32 cannot be improperly operated by' pressure from the triple valve 35 if the same -should leak, it

levers 43 have pivotal `connection with links being understood that the contracted port 11 does not permit of the escape of all of the pressure from the pipe 33, When the triple valve exhausts, sufficient pressure being-retained `for the proper operation o the lockpiston 32.

It is often desirable to 'have manually operated means to release the pavvl 16, operating 'in conjunction with the automatic means for this purpose. To provide for this, the housing casing 15 is provided with forwardly projecting arms 4Q, to which. are pivoted levers 43, as shown at The. inner ends of these levers 43 are pivotally connected with the ends of the rod 9.8. The

15, extending to the side of the car and `adapted to be manually operated, Vas is obvious. It is apparent that when either link Y 45 is moved outwardly, the rod 29 Will be moved toward the guide casing 15, eiecting a swinging movement of the bell-crank lever 23 to bring the pawl 16 out of engagement with the teeth 111 of the tubular piston rod.

The numeral 46 designates a push brake rod, having suitable connection with the brake rigging and inserted Within the tubular pist-on rod 7.

The operation of the apparatus is as follows: When it is desired to apply the brakes, the engineers air brake valve is manipulated in theusual manner to reduce the pressure in the train line 36. The air pressure will now pass from the auxiliary reservoir 34, through the triple valve36 and pipe 37, to the cylinder This forces the brake piston 6 to the left applying the brakes, until the pressure is equalized in the pipe 38 and' the train line pipe 36. During the longtum dinal movement of the tubular piston 11 the left, the pawl 16 trips upon the teeth le, whereby this'pawl Wil automatically' loclr the tubular piston against returning move-f ment, until the pavvl is shifts l to the release position. By y this means the brakes are locked in the set condition. The brakes having been applied and locked they may be re leased by shifting the handle of the engr neers air brake valve to the full release po sition. This restores the pressure in theV train line pipe 36. The triple valve 35 is now operated to cut olf the supply of pres sure to the brake cylinder 5 and this presu sure in the brake cylinder exhausts from the i triple valve through the pipe 38. This en haust pressure enters the lock-cylinder 31 and forces the lock-piston 32 to the lett. The pawl 16 is automatically elevated and the piston rod released. The spring 13 now automatically returns the brake piston to the starting position. Upon the reduction of pressure in the lock-cylinder 31 the spring 33 returns the lock-pist0n 32 to the starting position, the pawl 16 again engaging with the teeth 14. The pavvl 16 may be maturing" operated asfbeforcindicated.

It is to be understood that the form oi my' invention herewith shown and described "e to be taken as a preferred example of the same, and that various changes in the ne, sise, and arrangement of parts may re sorted to Without departing from the pirit of the invention or the scope of the subjoined ce claims. y

Having thus described the invention, l claim:

1. In apparatus of the character del scribed. the combination with a brake cylim der, of a brake piston mounted to move therein, a piston rod connected with the piston, a. triple valve connected '.vfth the brake cylinder to control the passage of pressure therein and having an exhaust through Which pressure passes fromthe brake cylinder, pressure operated means to engage the piston rod and lock the piston against movement, and means ol' communication between the exhaust of the triple valve ar d the pressure operated means so that the pressurel operated means is set into action by the eXv haust from the triple valve.

2. In apparatus of the character described, the combination with ya brake cylinder, of a brake piston. mounted to move therein, a piston rod secured to the piston, a triple valve to control the passage of pres sure to the brake cylinder and having an exhaust through which pressure passes from the brake cylinder, an element to engage 'with the piston rod to lock it against movelshing communication between the exhaust of the triple valve and the lock-cylinder.

3. In apparatus of the character described, the combination with a brake cylinder, of a brake piston mounted to move therein, a piston rod secured to the brake piston, a triple' valve to control thepassage of pressure to the brake cylinder and having an exhaust through which pressure passes from the brake cylinder, an element to engage the piston rod to lock it against move ment, a lock-cylinder, a lock-piston mounted to move therein and having connection with the element to move it, and a conduit connecting the lock-cylinder and exhaust of the triple valve and having a contracted port communicating with the atmosphere whereby the lock-piston fill not be improperly operated by leakage from the triple valve.

4f. In apparatus of 4 the character described, the combination with a brake cylinder, of a brake piston mounted to move therein, a piston rod connected with the piston and provided with a. longitudinal set o teeth, a movable pawl to engage and disenrgage the teeth, a lock-cylinder, a lock-piston mounted to move therein, operative connectw ing means between the lock-piston and pawl, and means to supply pressure to the lock cylinder.

5. In apparatus 'of the character de scribed, the 'combination with a brake cylinder, of a brake piston mounted to move therein, a tubular piston rod connected .with the piston and provided with a longitudinal set of teeth, a' rod having connection with the brakerigging and extending into" the tubular pistomand an element to engage the teeth of the tubular rod to hold it" against movement.

In testimony whereof I affix my signature in presence of two Witnesseso" MURRAY HENRY. lWitnesses:

FOSTER BRADY, A. L. CHURCHILL,

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