| 摘要 |
A fastener driving tool assembly for operation by an operator in a standing position, the assembly comprising upper and lower tubes (6,8) telescopically mounted, a drive shaft (10) extending through the tubes from a drive tool (2) at the upper end of the upper tube (6), the drive shaft having a driving bit (12) at its lower end, a housing (20) at the lower end of the lower tube and having a chamber (22) to receive a fastener to be driven into sheeting on which the operator is standing, the drive tool (2) and upper tube (6) being displaceable downwardly relative to the lower tube (8) by the operator to place the driving bit in driving engagement with the head of the fastener, and a fastener feed system comprising a feed tube (24) for storing individual fasteners in end to end relation along the tube, the lower end of the feed tube communicating with the chamber ( 22) in the housing, and a control mechanism for releasably retaining the lowermost fastener in the feed tube and for releasing that fastener for passage into the chamber, operation of the control mechanism being responsive to movement of the upper tube to lower or raise the driving bit within the chamber, the control mechanism comprising a control cam (40) slidably mounted on the feed tube and displaced by movement of the upper tube within the operational cycle of the assembly. |
