Locks – Operating mechanism – Combination
Patent
1977-03-30
1979-03-06
Holko, Thomas J.
Locks
Operating mechanism
Combination
70319, E05B 3708
Patent
active
041423887
ABSTRACT:
The tumbler includes a connection between an outer gate ring and an inner drive member of a tumbler wheel together. The gate ring includes a leg on the gate ring with a gripping portion thereon. The leg normally biases the gripping portion to a securing position against the drive member to grip it so that the gate ring and drive member normally rotate together. An opening is provided in the gate ring adjacent the leg having a curved portion about its periphery for receiving a key having a curved portion about its periphery. The key rotates against the curved surface of the opening, and a cam section of the key cams a cam follower portion of the leg when the key is rotated to a releasing position for urging the gripping portion away from the drive member. The camming surface, opening and cam follower are so provided that on rotation of the key in the opening to the releasing position, the biasing effect of the leg is prevented from tending to return the key to the securing position. An aperture through the case is aligned with the openings in the gate rings when the arm is in each gate for passage of the key therethrough. The key has a cut-out portion which is located in the aperture when the key is in all the openings. the aperture has a shape that cooperates with the cut-out portion of the key to limit rotation of the key to the releasing position and to prevent the portion of the key in the case beyond the cut-out portion from being removed from the case except when the key is in the inserting position.
REFERENCES:
patent: 83129 (1868-10-01), Brettell
patent: 370568 (1887-09-01), Stoner
patent: 1145377 (1915-07-01), Lewis
patent: 1193754 (1916-08-01), Benham
patent: 1240114 (1917-09-01), Baum
patent: 1484692 (1924-02-01), Weber
patent: 1644650 (1927-10-01), Millice
patent: 1956069 (1934-04-01), Hill
patent: 1956304 (1934-04-01), Abbott et al.
patent: 2494575 (1950-01-01), O'Brien
patent: 3627938 (1971-12-01), Davidson
Gartner Klaus W.
Holko Thomas J.
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