Title:
LOCK SYSTEM WITH IMPROVED AUXILIARY PIN TUMBLER STACK
Document Type and Number:
WIPO Patent Application WO2006017408
Kind Code:
A3
Abstract:
In a pin tumbler-type cylinder lock having an auxiliary tumbler stack, the bottom pin of the auxiliary tumbler stack has a recessed underside for receiving a projection on the key to form a detent. The invention provides an additional functionality that has not previously been associated with the auxiliary tumbler stack. When the projection on the key as seated, it prevents the key from being withdrawn from the keyway while the plug is in any rotational position in which the drive and bottom pins are not substantially aligned. Thus, the key is retained whenever the plug has been rotated.
Inventors:
EDEN CHARLES W JR (US)
Application Number:
PCT/US2005/027143
Publication Date:
July 06, 2006
Filing Date:
July 29, 2005
Export Citation:
Assignee:
KABA ILCO CORP (US)
International Classes:
E05B11/00
Foreign References:
| US4823575A | 1989-04-25 | |||
| US5101455A | 1992-03-31 | |||
| US6257033B1 | 2001-07-10 | |||
| US5361614A | 1994-11-08 | |||
| US5101648A | 1992-04-07 | |||
| US4235086A | 1980-11-25 |
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