| Abstract |
In a magnetic key operated lock a slide member 6 carries a plurality of wheels 24a, 24b, 24c,24d, and 25 which carry magnet pins 28a, 28b, 28d and 26. The position of the pins forms part of a code of the lock. The wheels are caused to rotate by insertion of a key having a code for unlocking the lock and moving the slide member 6. As the slide member 6 moves, one of the pins 28a, 28b, 28c, 28d which is repelled by the key abuts a stop 43a, 43b, 43c, 43d which thus causes the respective wheel and so the other wheels, to rotate. By having wheels 24, 26 of two different sizes, the smaller wheels can be ' made to rotate more than once before a code is repeated (Figure 8) An abutnent 43 is fonred by pressing a tang from a stationary wall in ,: the lock. Fiqures 10 to 14 show variations in which a single wheel may , have more than one abutnent associated with it so that a magnet pin can be used to change the code when it is in more than one position, and a wheel may have pins of different polarities with respect to the key. |