| 摘要 |
<p>A contact mechanism where operation of a trigger is effected when the mechanism is moved upward relative to a nose section (4), in which there is provided a switchover device (28). The switchover device (28) holds a lower contact member (11) between two springs (23, 24) arranged in a vertical relationship near the nose (4), the lower end of the lower contact member (11) being urged by the upper spring (23) to project downward from the lower end of the nose section. Further, the switchover device (28) can be switched to the following three positions: a first position at which the contact member (11) is held at an upper position against the upper spring (23), a second position at which the contact member (11) is held at a lower position against the lower spring (24), and a third position at which the movement of the contact member is not restrained.</p> |
