| 摘要 |
<p>In the caulking gun disclosed herein, the piston (17) of a caulking cartridge (11) is driven by axial movement of a exteriorly threaded tube (37) which is, in turn, driven by a rotating ring gear (31) which is interiorly threaded to mate with the tube. The threaded tube (37) is longitudinally split so that it can collapse out of engagement with the threads (33) on the ring gear (31). A tapered plug (55) cooperates with an expandable bushing (51) inside the tube (37) so as to hold the tube (37) in engagement with the threads (33) in the ring gear when the plug (55) is in a first position but, when the plug is moved to a second position, the bushing (51) allows the tube (37) to collapse thereby releasing pressure from the piston (17) and allowing quick retraction of the split tube (37) to facilitate loading of a new caulking cartridge (11). <IMAGE></p> |
