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737,022
stem carrying said valve and having an en- larged head, a pin carried by the stem of the piston and adapted to a slotted opening in the valve - stem, a spring surrounding said 5 valve-stem and tending to maintain the valve in closed position, and a plurality of spring- fingers carried by the graduating-stem and forming a socket for engagement with the en- larged head of the valve-stem, substantially $o as specified. 8. In a device of the class specified, a triple valve having a ported piston, a slide-valve and a graduating-stexn,a spring-pressed valve disposed in the piston-port, means for tem-
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porarily locking said valve to the graduating- 15 stem,a graduating-valve disposed in the slide- valve and comprising a valve-body secured to the piston-stem, a valve independent of said valve-body, and a spring disposed between the valve. and valve - body and tending to 20 maintain the valve in closed position. In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses. DAVID M. ROBINSON. Witnesses: JNO. T.'CRADDOCK, C. A. LEDDY.