Pick-resistant pin tumbler system

摘要

A pin set for a radial pin tumbler cylinder lock intended to resist picking comprises a driver pin 320, a differ pin 318 and a biasing means 322 and one of the pins is formed with a region of magnetised material adjacent the other pin which is provided with a magnetised region. As shown a brass driver pin 320 has a embedded magnet 300 and attracts a mild steel driver pin to resist any force tending to separate the pins applied during picking. The magnet can be used in either pin and/or either pin can be formed as a permanent magnet. The stepped diver pin 320 shown is intended to limit the projection of the differ pin 318 into the keyway but the driver pin can have a constant diameter. A variable rate spring arrangement can replace the compression spring 322 shown and a repulsive magnetic arrangement can also be employed to effect bias. The invention also relates to a radial pin tumbler cylinder lock mechanism which incorporates at least one pin set as described above.