| 摘要 |
<p>"DRAWBAR" A drawbar having at one end thereof a hook member defining a recess into which a coupling member is to be inserted, and including a retaining pin movable in a socket in the hook member between a retaining position in which an outer end of the retaining pin extends from the socket to constrict the mouth of the recess to retain the coupling member in the recess, and a release position in which the retaining pin is retracted wholly into the socket against a spring to enable the coupling member to be removed from and inserted into the recess, and a stop to limit the outward movement of the retaining pin.</p> |
