Device for blocking key passage of a lock

Details Device for blocking key passage of a lock Device for blocking key passage of a lock

1979-05-17

1981-07-14

Wolfe, Robert L.

Locks

Operating mechanism

Key

70431, E05B 1714

Patent

active

042779626

ABSTRACT:
The invention relates to a device for blocking the key passage of a lock. The device can be utilized as a supplemental security, permitting the use of the lock only after a specific condition has been satisfied to produce the retraction or moving aside of the blocking element. The device comprises a movable abutment which can occupy a first position in which it blocks the key passage and a second position in which it clears the passage, the movement from the first position to the second position being controlled by a thermo-deformable element.

REFERENCES:
patent: 3820364 (1974-06-01), Greeley

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