Pin tumbler lock
AssigneeKabushiki Kaisha Goal
InventorMitsunori Miyake
Life of this patent
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Abstract
A tumbler lock comprising housing pockets in an outer housing and plug pockets in a cylindrical plug rotatably mounted in the housing holding slidably outer and inner pins respectively, auxiliary pockets in the housing corresponding to the plug pockets at a certain rotated position circumferentially spaced from the housing pockets holding therein auxiliary pins, and change pins which may be interpositioned between the inner, outer and auxiliary pins and interchanged between the respective pockets so that the change pins may be freely shifted to reset the back to be operated by different keys.
Claims9
In a pin tumbler lock having a housing with a cylindrical bore, a cylinder provided with a key slot rotatable in said bore, at least one housing pocket provided in the cylindrical inner face of the housing, at least one auxiliary pocket in said cylindrical inner face of the housing circumferentially spaced from said housing pocket, at least one cylinder pocket in the cylindrical outer face of the cylinder alignable by rotation of the cylinder with the housing pocket and an auxiliary pocket, a support pin slidably disposed in each housing pocket and each auxiliary pocket resiliently urged by a spring inwardly in the direction of the key slot, one cylinder pin slidably guided in each cylinder pocket and at least one change pin slidably interchangeable between a housing pocket, cylinder pocket and auxiliary pocket, the improvement comprising:
- engaging means engageable with the cylinder pin in each position of the change pin in alignment with a cylinder pocket for blocking relative circumferential movement between said change pin and said cylinder pin, and disengaging means for releasing said engaging means from the blocking position when said cylinder pocket is substantially aligned with said auxiliary pocket.
Dependencies are inferred from the claim text.