Spring security lock

Details Spring security lock Spring security lock

1983-10-31

1985-04-30

Wolfe, Robert L.

Locks

Portable

Padlocks

70386, E05B 6736

Patent

active

045135916

ABSTRACT:
A high security spring lock and an associated key for locking and unlocking the lock. The lock has a cylindrical barrel with an axial bore. A main compression spring and a secondary compression spring are coaxially mounted in the bore and bear against each other and against opposite ends of the bore. A pair of locking balls constrained for limited movement in radially extending passageways are held radially outward in a locking position by the main compression spring.
The key has elongated outer expanding fingers and an inner coaxially arranged center pin. When the key is fully inserted into the lock and the key handle is operated, the expanding fingers are initially radially expanded to grip the inner surface of the main compression spring and are then longitudinally retracted to draw the main compression spring rearwardly. Simultaneously, the key center pin prevents the secondary compression spring from expanding to follow the rearwardly drawn main compression spring, thereby permitting the locking balls to move radially inward to an unlocking position.

REFERENCES:
patent: 1923025 (1933-08-01), Morse
patent: 3002368 (1961-10-01), Moberg
patent: 3835674 (1974-09-01), Hoyt
patent: 4040279 (1977-08-01), Sigmorelli
patent: 4441343 (1984-04-01), Nielsen

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