A carrier locking system for a horizontal pendulum conveyor employs a coupler at the free end of a generally L-shaped pendulum arm which interlocks with a receiver on a carrier. The coupler and receiver are normally in an unlocked position when the carrier travels along a horizontal path, and automatically interlock when the carrier travels along an inclined path. Locking the carrier to the pendulum arms prevents the carrier from becoming separated from the pendulum arms when descending into a surface treatment tank.
Apparatus utilizing a special clamping fixture supports a motorcycle or similar vehicle as it is conveyed along an assembly line. The fixture is secured to an overhead conveyor by a stabilized suspension means that positions the fixture beneath the motorcycle so that it may receive a pair of laterally spaced, lower frame members of the motorcycle frame. The fixture employs a pair of vises located fore and aft relative to the direction of movement of the conveyor, each of which has a pair of jaws with an axis of clamping action extending transversely of the direction of conveyor movement for receiving a corresponding frame member. An operating means which may be actuated from either side of the conveyor opens and closes the two vises in unison to clamp and hold the frame members. In order to accommodate dimensional variations in the spacing between the frame members, one of the vises is free to float horizontally independently of the other vise as the jaws are tightened onto the frame. Initial mounting of the frame in the fixture is facilitated by support blocks that hold the motorcycle in position as the vises are tightened.