| 摘要 |
655,844. Sampling liquids. ROCKWELL MANUFACTURING CO. Jan. 22, 1948, No. 1963. Convention date, Sept. 30, 1946. [Class 106 (v) ] [Also in Group XXIX] An automatic liquid samp ler comprises a spring-loadec valve 3 disposed in the liquic conduit 1 and controlling th( flow through a branch conduit 8 leading to a collecting jar 14, said valve being actuatec intermittently through a roc 11 by a spring-loaded hammer 31 driven through a yoke anc ball-clutch mechanism from a flow meter in the conduit 1 The meter, through rate con trol gearing, rotates the shaft 53 and turns the wheel 39 having an upstanding lug 41c which engages a lug 42 on a wheel 42a. As the wheel 42a turns, a pin 47 moves a Scotch yoke 45 which retracts the hammer against its spring 44 until the pin passes its outer dead-centre, whereupon the spring urges the hammer rapidly forward to hit the head 29 on the rod 11 and open the valve. The intertia of the moving yoke parts carries the pin past its inner deadcentre, the ball-clutch 49 preventing any reverse movement, so that the hammer is retracted sufficiently to allow the return of the head 29 by the spring 6 when the valve closes. The amount of movement of the head, and therefore of the valve, is determined by the position of the stop 28a which is adjustable by means of the rotatable sleeve 23 carrying a scale 3 indicating the amount of valve opening. The sleeve screw - threadedly engages oppositely threaded couplings 21, 22 so that on rotating the sleeve the coupling 22 carrying the stop moves to or from the fixed coupling 21. |
