E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
E05B 27/02 (2006.01)
Patent
CA 2590676
The invention provides a cost effective way to improve the presently used Tumbler Lock design to prevent break-ins by the use of a "Bumber Key", which involves hitting with modest force an inserted preformed key to cause all the top pins (Tumblers) to fly up for a moment and allowing the inner cylinder to turn, thus opening the lock. The invention consists of adding 2 rows of radially directed additional holes in the rotating cylinder (Plug) of the lock, at a 30° angle from the centre line in both directions, and adding one additional, specially shaped pin, above the two regular pins in each chamber. When a "Bumper Key" is used to attempt an illegal entry, the added pins, being the last in the column, fly up, permitting the Plug to turn 30° in either direction, when these pins fall into the added holes and lock up the cylinder in that 30° position. The lock becomes inoperable and the "Bumper Key" is captured and cannot be extracted, leaving evidence of an attempted break-in.
Gotz Lasar
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