| 摘要 |
949,591. Diaphragm pistons. G. M. J. C. BUSSERY. June 27, 1961 [July 21, 1960], No. 23218/61. Heading F2T. [Also in Division F1] In a reciprocating pump a close-fitting sheath 14 of elastic material is fitted over the plunger 12 and the free edge of the sheath is clamped between sections 2, 3 of the pump body. The sheath 14 acts as a return spring for the plunger. |
