Three stage combination replacement lock

Details Three stage combination replacement lock Three stage combination replacement lock

1987-12-10

1989-10-10

Wolfe, Robert L.

Locks

Special application

For closures

70150, 70312, E05B 6506

Patent

active

048723266

ABSTRACT:
A three stage lock unit according to the teachings of the preferred embodiment of the present invention is shown as including a patented combination lock secured within an outer housing of the lock unit which is secured to a mail box door or any small door. Combined with the combination lock is a push button constrained by the combination lock until the correct lock combination is dialed releasing an arm of the push button placed to utilize a hole in the door previously used for another type of lock. The push button arm extends inward to an inner housing to contact the sliding spring mounted door latch within a slot of the latch and opens the unit door when pushed inwardly. A spring activated pin within the door latch extending into the slot to meet the push button arm helps to close the system smoothly by providing an auxiliary force through pressure on the push button arm to relatch with the combination lock latch. In addition, latch handle is provided in the inner housing to be used by service personnel to open the door from the inside for resetting the combination lock. To reset the combination lock dials push buttons are provided as an improvement over a pin type tool normally used to set the lock.

REFERENCES:
patent: 4231597 (1980-11-01), Pelcin
patent: 4249469 (1981-02-01), Craske
patent: 4279136 (1981-07-01), Milles
patent: 4281525 (1981-08-01), Bako

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