Lock system with key trapping

Details Lock system with key trapping Lock system with key trapping

1996-07-19

1998-10-13

Meyers, Steven N.

Locks

Operating mechanism

Key

70389, 70406, 70419, E05B 1106

Patent

active

058195670

ABSTRACT:
A novel lock system utilizes a cylinder lock and a companion key with a projection extending from one side thereof to improve security. The cylinder lock comprises a shell, a core which is rotatably mounted within the shell and a plurality of pin tumbler stacks normally prevent movement between the shell member and the core. Shear lines are defined between the shell and the core, and also within each tumbler stack. The core also includes an outer surface, a longitudinal keyway and a cut-out which is normally offset from, but alignable with, at least one of the tumbler stacks. A plate member is disposed within the cut-out for movement between a first position, wherein the plate member acts as an extension of the core surface to prevent a tumbler stack from entering the cut-out and a second position, wherein the plate member does not prevent a tumbler stack from entering the cut-out. Upon insertion of an authorized key, the key bitting will appropriately align the tumbler shear lines with the shell/core shear line, and the key projection will urge the plate from the second position to the first position and thereby permit the core to rotate to an unlocked position. Upon insertion of a properly bitted key which does not possess an appropriate key projection, however, only partial core rotation is permitted whereupon a tumbler stack enters the cut-out to thereby render the lock inoperable and trap the unauthorized key within the keyway.

REFERENCES:
patent: 915317 (1909-03-01), Thomas
patent: 2151245 (1939-03-01), Swilens
patent: 4085601 (1978-04-01), Sauder
patent: 4377082 (1983-03-01), Wolter
patent: 4377940 (1983-03-01), Hucknell
patent: 4393673 (1983-07-01), Widen
patent: 4787225 (1988-11-01), Hauser et al.
patent: 4869085 (1989-09-01), Meissner

Affiliated with

Also associated with

Rating

Lock system with key trapping does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lock system with key trapping, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lock system with key trapping will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-301809