| 摘要 |
1,215,110. Valves; clutch control. KING OF PRUSSIA RESEARCH & DEVELOPMENT CORP. 19 June, 1969 [6 Nov., 1968], No. 31055/69. Headings F2L and F2V. A threaded valve actuator shaft 15 is moved axially by an axially-captive nut 55 which is rotated by an electric-motor driven sleeve having integral teeth 20 via gears 22, 32, 41 clutch 40 and gears 42, 51. The gear 22 is threaded on to a portion 23 of a shaft 24 so that, when the closure member seats, continued rotation of the gear 22 with gear 32 splined to shaft 24 held stationary causes shaft 24 to move axially against the loading of a spring disc assembly 36 to open a switch (61) to de-energize the motor. A hand wheel-actuated shaft 45 extends coaxially of the motor driven sleeve and the clutch 40 allows either the driven gear 41 or the shaft 45 to rotate the output gear 42 of the clutch to rotate the nut which is splined to the sleeve 53 on which gear 51 is keyed. Gear 41 drives gear 42 through a roller 50 which abuts the inclined face 341a of recess 341. When shaft 45 is driven an intermediate member 43 which is keyed to the shaft is rotated against the bias of spring 49 until the shoulder 643 abuts the lug 148 on the gear 42 when recess 444 is opposite the roller and further rotation of the shaft and member 43 relative the gear 41 causes the surface 341a to cam the roller into the recess 444 to permit the gear 42 to be rotated without rotation of the gear 41. In a further embodiment the clutch is dispensed with and the shaft operating the switch is coaxial with the nut which is coupled thereto by a squared or other non-circular sectioned rod engaging within a corresponding bore of a sleeve. The hand wheel is normally disengaged from the shaft 45 by a spring but axial movement of the hand wheel engages co operating lugs on the shaft and hand wheel. |
