Claims
- 1. A tamper-resistant lock comprising an outer cylinder adapted to be mounted in an entrance barrier; an inner cylinder rotatably mounted in said outer cylinder; a plurality of top pins disposed in chambers in said outer cylinder; said top pins being urged toward said inner cylinder; a plurality of bottom pins disposed in chambers in said inner cylinder; said chambers in the inner and outer cylinders being in alignment when the lock is locked; at least one wafer disposed between said top pins and said bottom pins in at least one of the chambers when the lock is locked; at least one of said wafers having a hole herein; at least one bottom pin having a hole therein; a plurality of trap pins mounted in trap pin chambers in the outer cylinder; said trap pins being urged toward the inner cylinder; said trap pins additionally having an extension thereon adapted to engage the hole in said wafer or said bottom pin when a wafer or a bottom pin having a hole herein passes a trap pin chamber.
- 2. A tamper-resistant lock comprising an outer cylinder adapted to be mounted in an entrance barrier; an inner cylinder rotatably mounted in said outer cylinder; a plurality of top pins disposed in chambers on said outer cylinder, said top pins being urged toward said inner cylinder; a plurality of bottom pins disposed in chambers in said inner cylinder, said chambers in the inner and outer cylinders being in alignment when the lock is locked; a plurality of wafers being disposed between at least one pair of said top and bottom pins when the lock is locked; at least one of said wafers having a recess in its side; at least one wafer being disposed between said top and bottom pins in the chambers not containing at least one wafer with a recess; at least one said wafer in chambers not containing at least one wafer with a recess having a hole therein; at least one trap mounted in a chamber in the outer cylinder; said trap pin being urged toward the inner cylinder; said trap pin additionally having an extension adapted to engage the hole in said hole bearing wafer when the lock is picked; a ridge mounted on either said inner or outer cylinder adapted to pass through the recess in said wafer containing a recess when the lock is opened normally and to stop the rotation of the inner cylinder at the angle of engagement of said trap pin when the lock is picked.
GOVERNMENT LICENSE
The invention described herein may be manufactured or used by or for the Government of the United States of America without the payment of any royalties thereon or therefore.
US Referenced Citations (6)