Key blade and method of producing same
AssigneeWiden Innovation AB
InventorBo Widen
Life of this patent
Estimating the term…
Abstract
A key blade having a longitudinal axis (A) of insertion and comprising an elongated, wave-like generally longitudinally extending code pattern (38) for cooperation with a row (23) of elevationally and rotationally movable locking tumblers (23a-23e) of a rotary cylinder type lock (18). Each of the locking tumblers is provided with a transversely projecting finger which engages with the code pattern (38) when the key blade is inserted into the lock. The code pattern (38) includes a number of concavity locations (40-44) which are displaced longitudinally and transversely so as to correspond to specific rotational and elevational positions of the locking tumblers which will permit releasing of the lock.
Claims25
A key blade (1) having a longitudinal axis (A) of insertion and comprising an elongated, wave-like, generally longitudinally extending code pattern (38) for co-operation with a locking tumbler (23a-23e) of a rotary cylinder type lock (18), characterized in that said code pattern comprises a one-sided guiding surface for engagement with a pivotable finger (23af-23ef) of said locking tumbler, said guiding surface including
- at least one concavity location (40-44), including a bottom surface portion (41c) and adjoining straight side wall portions (41d) extending obliquely with respect to the longitudinal axis (A) of the key blade, for positioning and supporting said pivotable finger, and
- sloping surface portions (40a,b-44a,b) adjoining each of said side wall portions (40d-44d) of said concavity location, at least a part of each sloping surface portion being bevelled and oriented so as to face away from the key blade and to enable a smooth, sliding contact with said pivotable finger when the key blade is being inserted into said lock.
A key blade having a longitudinal axis of insertion, the key blade having an elongated generally longitudinally extending wave-like code pattern (38) for cooperation with elevationally and rotatably movable locking tumblers (23a-23e) of a cylinder type lock (18), characterized in that the code pattern (38) comprises a one-sided guiding surface including longitudinally displaced concavity locations (40-44) for engagement with a pivotable finger (23af-23ef) extending transversely from each of said locking tumblers, at least one of the concavity locations having a side wall portion (41d) which is obliquely extending with respect to the longitudinal axis (A) of the blade.
A key blade having a longitudinal axis of insertion, the key blade having an elongated generally longitudinally extending wave-like code pattern (38) for cooperation with elevationally and rotatably movable locking tumblers (23a-23e) of a cylinder type lock (18), characterized in that the code pattern comprises a one-sided guiding surface including longitudinally displaced concavity locations (40-44) for engagement with a pivotable finger (23af-23ef) extending transversely from each of said locking tumblers, the longitudinal distribution of said concavity locations being irregular so as to effect a specific rotational positioning of each locking tumbler (23a-23e) with its finger upon inserting the key blade into the lock.
Dependencies are inferred from the claim text.