Working with its Japanese partner, Koganei, Humphrey Products Co. (www.humphrey-products.com) improved its standard pin clamp by applying a vanadium carbide coating for extra hardness and resistance to wear, and redesigning the Power Lock cylinder to provide more power and greater holding force. Various sizes and configurations are available for stamping and assembly applications, with bore sizes from 20 mm to 63 mm (0.7874 in. to 2.48 in.) and pin diameters from 5.5 mm to 59.8 mm (0.2165 in. to 2.35 in.).

The Power Lock cylinder is spring actuated to close and air driven to open. The air port for the clamp is internal to the actuator, eliminating the need for an extra valve to release the lock. Using a spring-actuated close function provides greater locking force as well as the ability to hold parts in the clamped position in the event of a power failure. A load-check mechanism with a switch confirms the panel is present on the actuator and eliminates the need for external sensing devices.