| 摘要 |
PROBLEM TO BE SOLVED: To enable a lowering head type pump to form without using a coil spring made of metal, without necessitating a separate treatment of the part and furthermore, without changing greatly the form of a conventional pump of the same kind so as to provide the excellent recovery capacity of an operative jetting part. SOLUTION: In this pump, between the lower part of the outer periphery of a stem 7 and the upper part of the inner periphery of a cylinder 5, a spiral spring member 10 made of a synthetic resin which is extended by lowering an operative jetting part B and energizes the operative jetting part B in a lowered state upward is disposed. Moreover, a stopper 11 for preventing the operative jetting part B from being lowered by interposing between the upper surface of a fixed suction part A and the lower surface of a lowering head 8, is freely attachably and detachably fitted to the outer peripheral part of the stem. |
