Release Swicth No. 6 Mk I (Service)

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Description: This switch consists of a body, over which is fitted a lid that is hinged at one end. In the body is located a spring-loaded striker, which is held in position by a safety pin inserted through the sides of the body and through the striker. In addition when the lid is sealed firmly down on the body, a trip lever, hinged in the sides of the body, engages a notch in the striker and holds the striker back against its spring. A stop pin limits the movement of  the trip lever in an upward direction. The body is threaded internally at the open end to receive a standard fuse adapter.

Functioning: When the restraining load on the lid is removed, the pressure of the trip lever forces the lid up. The trip lever is then allowed to swing in a counterclockwise di-rection and become disengaged from the notch in the striker. The striker spring then for-ces the striker into the percussion cap.

Use: This switch is designed for booby trap installations where initiation by release of pressure is desired. Its design allows it to be inserted into narrow openings, as under a door, behind a drawer, etc. It is designed to withstand the weight of heavy objects, such as packing cases, etc.

Installing: Insert the necessary length of safety fuse in the fuse adapter. Install the switch in the desired position, and connect the other end of the safety fuse to the ex-plosive charge. Withdraw the safety pin, which should come away easily, since the trip lever has forced back the striker and unlocked the safety pin. If the safety pin does not withdrawn freely, the weight on the switch lid is insufficient and should be increased. Do not attempt to force out a safety pin which seems difficult to remove.

Disarming: If the device is accessible, insert a safety pin in the safety-pin hole, cut the safety fuse connecting the switch to the explosive charge, and remove the fuse adapter. If the switch is inaccressible, cutting the safety fuse will have to suffice.

Remarks: To reset this switch, unscrew the fuse adapter and withdraw the striker and spring. Throw the trip lever over until it rests on the stop pin. Insert the spring and the striker, with the notch on the striker uppermost. Force back the striker with a pencil or rod, and insert the safety pin. Throw the trip lever forward, and close the lid. Screw in a new fuse adapter with percussion cap.

This switch is used only for special operations and for preparatory training in these operations.