Sequential locking two key lock

摘要

The lock includes a lock housing mounting a first tubular member. The first tubular member includes a plurality of spring biased pins which are divided into a plurality of sections. An intermediate tube is rotatably received within the first tube and includes a spring biased cam member which has a pin extending through a slot formed in the intermediate tubular member. The pin extends into the first tubular member to inhibit rotation of the intermediate tubular member. An inner tubular member is received in the intermediate tubular member and includes a keyway formed therein. A first key is received into the keyway and coacts with the first segments of each of the pins to enable rotation of the inner tubular member thereby moving the cam surface forwardly and rotating the pin to a second position. Thereafter, a second key is placed in the keyway. The second key coacts with certain segments of each pin to allow rotation of the intermediate tubular member which also carries a pair of shackle releasers.