Grady A Kelton

US Patent:

57751463, Jul 7, 1998

Filed:

Jun 7, 1995

Appl. No.:

8/479165

Inventors:

Charles Christopher Edwards - Greeneville TN
Grady A. Kelton - Greeneville TN

Assignee:

Hurd Corporation - Greeneville TN

International Classification:

E05B 2904

US Classification:

70369

Abstract:

A key lock tumbler cylinder is selectively removed with an extraction key that is longer than a normal operating key. The last tumbler plate in a tabular cylinder series along the cylinder key slot projects into an arcuate channel in the cylinder cavity wall of the lock body. This arcuate channel does not junction with the lock tumbler plate channel but does intersect with a second channel in the cavity wall that is angularly displaced about the cylinder axis from the tumbler plate channel. However, the second channel is more shallow than the arcuate channel to confine the tumbler cylinder within the body cavity when rotated by the operating key which does not engage the last tumbler plate key aperture. A second, tumbler cylinder extraction key that is longer than the operating key includes an edge bit at the end of the key for cooperating with the last tumbler plate key aperture. This end of the extraction key withdraws the last tumbler plate from the arcuate channel sufficiently to allow a tabular extension from the last tumbler plate blade to align with the second channel when the tumbler cylinder is rotated about the cylinder axis from the tumbler plate channel penetration position.

US Patent:

39642801, Jun 22, 1976

Filed:

Apr 7, 1975

Appl. No.:

5/565392

Inventors:

Grady A. Kelton - Greeneville TN

Assignee:

Avis Industrial Corporation - Greeneville TN

International Classification:

E05B 2700
E05B 6506
E05B 6544

US Classification:

70 84

Abstract:

A locking mechanism for locking menbers, such as slidable or swingable closures, to another, usually stationary, member in closed position in which a bracket on the stationary member is engageable by a hook on the closure member to latch the members together while actuation of the hook into a position of disengagement from the bracket to unlock the members from each other is accomplished by a key operated push lock mechanism.