Locks – Operating mechanism – Key
Patent
1995-06-07
1998-07-07
Meyers, Steven N.
Locks
Operating mechanism
Key
70367, 70377, E05B 2904
Patent
active
057751463
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. In such a rotated position with the cylindrical extraction key, the tumbler cylinder may be extracted from the body cavity.
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Edwards Charles Christopher
Kelton Grady A.
Hurd Corporation
Meyers Steven N.
Pham Tuyet-Phuong
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