| 摘要 |
A manually actuable release arm of a fifth wheel coupling is engagable with a plate in a first position wherein the locking member is retracted to allow release (or entry) of a king pin and in a second position wherein the member is projected to hold a locking jaw in its king pin locking position. This may be accomplished by respective engagement of detents in the release arm with the edge of an aperture in the plate flange. To assist release of the king pin, a piston of a fluid actuable piston and cylinder arrangement (38, 39) is connected to the release arm and can be operated to move the release arm against the bias of spring to its first (release) position. In this respect, a plunger on the release arm may be used to actuate a switch which operates the piston. |
