| 摘要 |
910,791. Reciprocating pumps. DRACKETT CO. Nov. 20. 1959 [Dec. 1, 1958], No. 39461/59. Class 102(1). A pump for mounting on a container comprises a cap 21 to which a moulded cylinder unit 12 having a collar 14 is attached by deforming the collar 14 to form the lip 30. A moulded piston/head portion is inserted in the cylinder bore and subsequently lips 66 are formed to prevent withdrawal. The head 37 screws into the collar 14 and seals therewith to prevent leakage in the immobilised position of the piston, in which position a small convolution 60 on the spring 52 engages the inlet valve 55 and holds it on its seat. |
