| 摘要 |
<p>A device that locks a threaded collar (14) around a cylindrical gun barrel (9) has a plunger (1) extending in a radial direction through the collar (14). The plunger (1) rides upon a series of ratchet teeth (30), disposed around the circumference of the gun barrel (9). The ratchet teeth (30) include ramps (12) and steps. As the collar (14) is threaded onto the gun barrel (9), the plunger (1) rides up the ramp (12) of each ratchet tooth (30) and drops into the step of the next ratchet tooth around the gun barrel (9). When in place, the plunger (1) is pushed backwards against the wall (16) of the ratchet tooth (30) and arrests rotation of the collar (14) in the unthreading direction. To remove the collar (14), the plunger (1) is lifted clear of the ratchet tooth (30). With the plunger (1) held clear of the step of the ratchet tooth (30), the threaded collar (14) can be unthreaded.</p> |
