Triple Valve For Air-Brakes Page: 3 of 4
[1], 3 p. : ill. ; 23 cm.View a full description of this patent.
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provided with a threaded stem 26, adapted plication of the brakes immediately after the
to a threaded recess in the upper end of the brakes have been released.
graduating-stem. The .stem 23 of the valve The construction is such that the invention 70
21 has a limited movement governed by a may be applied to triple valves in ordinary
S transverse pin 27, carried by the walls of the use with but slight expense and without any
main piston-stem and extending through a alteration in the construction of the main
slot 28 in the stem 23, as shown by dotted valve members.
lines in Fig. 3. While the construction herein described 75
The graduating-valve 10 in the ordinary and illustrated in the accompanying draw-
1o construction is in the form of a solid cylin- ings is the preferred form of the device, it is
drical block secured to the piston-stem and obvious that various changes in the form,
movable therewith to open or close the pas- proportions, size, and minor details of the
sage from the auxiliary reservoir to the brake- structure may be made without departing 8o
cylinder. In carrying out my invention I from the spirit or sacriicing any of the ad-
r5 employ a valve of the construction more vantages of my invention.
clearly shown in Fig. 2 and comprising a Having thus described my invention, what
valve-head 30, mounted on a stem 31, the lat- I claim is-
ter being fitted within the recessed end of the 1. In a device of the class specified, a triple- 85
valve-body 32, which is connected to the pis- valve piston having a'port for the passage of
zo ton. The valve-body is provided with longi- air from the train-pipe to the auxiliary res-
tudinal slots 33 for the reception of a trans- ervoir, a valve in said port, and means for
verse pin 34, carried by the valve-stem and maintaining the valve in open position to
limiting the independent movement thereof, permit the recharging of the auxiliary reser- 90
while the valve 30 is normallypressed against voir while the brakes are set.
25 its seat by a coiled compression-spring 35, 2. In a device of the class specified, a triple-
situated within the recessed valve-body and valve piston having a port for the passage of
surrounding the valve-stein. air from the train-pipe to the auxiliary res-
In the operation of a triple valve construct- ervoir, a valve in said port, and means for 95
ed in accordance with this invention the re- mechanically locking said valve in open po-
30 duction of pressure in the train-pipe causes sition to permit the recharging.of the auxil-
a downward. movement of the piston, moving iary reservoir while the brakes are set.
the graduating-valve to open position and 3. In a device of the class specified, a pis-
permitting the flow of air from the auxiliary ton having a port for the passage of air from zoo
reservoir to the brake-cylinder. The down- the train - pipe to the auxiliary reservoir, a
35 ward movement of the piston causes the en- valve in said port, a graduating-stem, and
gagement of the valve-stem head 24 in the means for temporarily locking the valve to
spring-socket 25, preventing further down- the graduating-stem, substantially as speci-
ward movement of the piston. When the fled. 105
reservoir-pressure has been reduced slightly 4. In a device of the class specified, a.triple
40 below the pressure in the train-pipe, the pis- valve having a piston and a graduating-stem,
ton will move upwardly to a distance suffi- a valved port or passage in the piston, a spring
cient to effect the closing of the graduating- tending to move said valve to the closed po-
valve, cutting off the flow of air from the sition, and means for temporarily locking the r11o
auxiliary reservoir and setting the brakes, valve to the graduating-stem, thereby to per-
45 By slowly increasing the train-pipe pressure mit the opening of the port or passage and
the piston will be moved upward to a slight the flow of air therethrough to the auxiliary
extent against the resistance offered by the reservoir.
spring 22, the head 24 being still engaged in 5. In a device of the class specified, a triple rz15
the socket 25 and holding the valve - stem valve having a ported pistou,a spring-pressed
50 down. This movement of the piston causes valve in said port, and means for mechanic-
the valve-seat to leave the valve 21 and per- ally locking and temporarily holding said
mnits the flow of air through the port 20 into valve in open position to permit the flow of
the auxiliary reservoir, the flow of air con- air from the train-pipe to the auxiliary reser- 120
tinning until the pressure in the reservoir voir, said valve being released by the inward'
55 and train-pipe is equalized. This may be movement of the piston under excess pressure
effected gradually and the auxiliary reservoir in the train-pipe.
restored to maximum pressure while the 6. In a device of the class specified, a triple
brakes are set. The train-pipe pressure is valve having a ported piston and a graduat- 125
then increased with what is known as "ex- ing-stem,a valve for closing said port, a valved
So cess" pressure, causing the disengagement of stem having an enlarged head, a spring sur-
the head 24 and the spring-socket 25 and per- rounding the valve-stem and tending to move
hitting the upward movement of the piston the valve to the closed position, and a spring-
and the movement of the slide-valve to re- socket carried by the graduating-stem for en- 730
lease position, permitting the exhaust of the gagement with said enlarged head.-
53 air in the brake - cylinder. By this means 7. In a device of the class specified, a triple
there will always be sufficient pressure in the valve having a ported piston and a graduat-
auxiliary reservoir to permit of a second ap- ing-stem,a valve for closing said port,aTrlve-2
73 7, 022
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Robinson, David M. Triple Valve For Air-Brakes, patent, August 25, 1903; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth510383/m1/3/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.