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(11) | EP 1 035 278 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Tumbler lock-key-assembly |
| (57) A combination of a disc tumbler lock and a key (8) therefor provided with key-bit
means (8b, 8c), the lock including a lock case (1) having therein a lock bolt (3)
movable back and forth and provided with a locking pin (4) or the like and a set of
tumbler discs (5) movable by turning the key and which are provided with a locking
channel arranged to co-operate with the locking pin (4) to control the transfer movements
of the lock bolt (3). The locking channel has at least a first (5a) and a second (5b)
branch extending transversely relative to the transfer movement of the lock bolt and
a third branch (5c) connecting the first and second branches, whereby the key-bit
means (8b) of the key has for each tumbler disc a combination surface (8c) which,
when the key is turned in the lock, moves the tumbler disc (5) in the direction of
the first (5a) and second (5b) branch to select the locking combination. The key-bit
means (8b) contains a guide member (8d) which affects the lock bolt (3) so that, in
the final stage of the selecting movement of the tumbler disc (5), it guides the locking
pin (4) into the third branch (5c) of the locking channel. The third branch (5c) of
the locking channel also has at least one guiding means (5f,5g) which is arranged
to prevent movement of the locking pin (4) through the third channel (5c) if the combination
surface of the key is incorrect. |