| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump type injector that hardly causes unexpected release of a maintenance mechanism for maintaining a state where a nozzle head is pushed in.SOLUTION: A pump type injector comprises a base (2), a pump (3), a nozzle head (4), and an adaptor (5). A maintenance mechanism (6) capable of maintaining a state where the nozzle head (4) is pushed in is provided between the nozzle head (4) and the adaptor (5). The maintenance mechanism (6) comprises a male screw part (11) that is provided on one of the nozzle head (4) and the adapter (5), and a female screw part (10) that is provided on the other thereof. An inner peripheral surface where the female screw part (10) is formed and an outer peripheral surface where the male screw part (11) is formed are formed with a projecting pat (13) and a recessed part (12) engaging with each other when completing the fastening of the female screw part (10) to the male screw part (11). |
