USA As Represented by Secretary of the Navy

Stanislaus J Otto

Verle L Doty

A load-unload device is disclosed for use in a vertical conveyor system hng means for sensing a jam condition between a downward moving conveyor tray and an article that has failed to remove from the load-unload device. The device includes linkage means for creating an over-center locked condition automatically releasable at a preset force. A spring receives the load due to a jam and develops the force necessary to unlock the linkage and allow the platform to move to a position for relieving the overload. A limit switch opens the conveyor drive motor down circuit as the platform moves. Provision is made for presetting a limited amount of platform movement without shutting off the conveyor.

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Silver Spring, MD, United States of America

Stanislaus J Otto