| 摘要 |
<p>561,507. Valves. BENDIX AVIATION CORPORATION. Aug. 20, 1942, No. 11761. Convention date, Nov. 6, 1941. Addition tc 546,859, [Group XXI]. [Class 135] [Also ir Group XXI] A machine gun recocking device according to the parent Specification has the inlet for liquid under pressure to the control valve provided with means controlled by the movable valve member for preventing the entry of liquid intc the control valve casing except when the said member is in the recocking position. In the form shown in Fig. 2, the valve 54 is capable of sliding and turning in a casing having a port 30 leading to a working cylinder, a pressure inlet port 32, and an exhaust port 34, the ports 30, 32 being provided with spring-urged check valves 36, 44. When turned from the positior shown to an extent limited by a stop 92, ar eccentric 98 unseats the valve 36 through a push rod 37 and the working cylinder communicates with the exhaust through a passage 103. Subsequent sliding movement to the right until a detent 58 engages a groove 56 closes this passage, and a tapered portion of the valve acts to unseat the valve. 44 through a push rod 45, and pressure liquid passes to the cylinder and through a hole 77 to a recess inside the valve. When the pressure in the working cylinder rises to a predetermined value it unseats a needle valve 78, adjustably loaded by a spring 82, to admit pressure to a chamber 78<1>. Here it acts as a part of the valve of increased diameter to complete its lift and on the valve member 54 to return it. to its initial position. When it is desired to lock liquid under pressure in the working cylinder, the valve 54 is merely moved to the right, so that the valve 44 is unseated. Pressure liquid then passes to the cylinder by lifting the valve 36 and is trapped therein by the valve 36 reseating when the valve 54 is back in the position shown.</p> |
