Cylinder lock mechanism

A cylinder lock mechanism which comprises:

• a tubular barrel,
• a lock cylinder received in said barrel for rotation about the longitudinal axis of the cylinder and having a row of spaced apart cylindrical tumbler bores extending longitudinally therein,
• a tumbler comprising a cylindrically-shaped body received in each of said bores for reciprocal longitudinal movement therein,
• a cap rotatably secured to a front end of the barrel and having an opening for insertion of a key therethrough,
• a discrete facing member received in said barrel for rotation about said axis and interposed between said cap and said cylinder, said facing member having an opening arranged for registry with said cap opening and with said bores, and said facing member comprising hard material resistant to drilling,
• a discrete spacer received in said barrel for rotation about said axis and interposed between said facing member and said cylinder, said spacer having an opening arranged for registry with said cap opening and with said bores,
• said openings when in said registry receiving a key for insertion thereof into engagement with said tumblers,
• means forming a transverse slot in said cylinder in communication with said tumblers,
• an engagement member received in said slot for engagement with said tumblers and laterally movable in the slot to and from the tumblers,
• means forming a longitudinal groove in the outer surface of said cylinder in communication with said engagement member,
• an elongated locking member received in said groove for engagement with said engagement member and laterally movable to and from said tumblers,
• means forming a longitudinal groove in the inner surface of said barrel arranged for registry with said cylinder groove to receive said locking member in both grooves in engagement with the cylinder and the barrel along the length of the locking member for interlocking the cylinder and the barrel,
• means on each of said tumblers for engaging said engagement member to support said locking member in a position projecting from said cylinder and into said barrel groove for locking purposes, and
• means on each of said tumblers permitting said engagement member to move towards the tumblers, thereby to permit retraction of said locking member from said projecting position for unlocking purposes,
• said engagement member and said locking member being free-floating in the lock mechanism such that said engagement and locking members are free to tilt in respective directions transverse to each other.

In a cylinder lock mechanism, the combination of:

• a lock cylinder having tumbler bore-forming means therein extending in the direction of its longitudinal axis,
• a plurality of tumblers received in said bore-forming means for reciprocal longitudinal movement therein,
• an engagement member extending transversely of said cylinder for engagement with said tumblers and laterally movable to and from the tumblers,
• an elongated locking member extending longitudinally of said cylinder for engagement with said engagement member and laterally movable to and from said tumblers,
• means on said cylinder for engaging said locking member along its length for locking purposes,
• means on each of said tumblers for engaging said engagement member to support said locking member in a projecting position with respect to said cylinder for locking purposes, and
• means on each of said tumblers permitting said engagement member to move towards the tumblers, thereby to permit retraction of said locking member from said projecting position for unlocking purposes,
• said engagement member and said locking member being free-floating in the lock mechanism such that said engagement and locking members are free to tilt in respective directions transverse to each other.

In a cylinder lock mechanism, the combination of:

• a lock cylinder having a row of spaced apart cylindrical tumbler bores therein extending in the direction of its longitudinal axis,
• a tumbler comprising a cylindrically-shaped body received in each of said bores for reciprocal longitudinal movement therein,
• means forming a transverse slot in said cylinder in communication with said tumblers,
• a discrete engagement member received in said slot for engagement with said tumblers and laterally movable in the slot to and from the tumblers,
• means forming a longitudinal groove in the outer surface of said cylinder in communication with said engagement member,
• a discrete elongated locking member received in said groove for engagement with said engagement member and laterally movable to and from the tumblers, said locking member engaging said cylinder in said groove along the length of the locking member for locking purposes,
• means on each of said tumblers for engaging said engagement member to support said locking member in a projecting position with respect to said cylinder for locking purposes, and
• means on each of said tumblers permitting said engagement member to move towards the tumblers, thereby to permit retraction of said locking member from said projecting position for unlocking purposes,
• said engagement member and said locking member being free-floating in the lock mechanism such that said engagement and locking members are free to tilt in respective directions transverse to each other.

In a cylinder lock mechanism including a tubular barrel, a lock cylinder received in the barrel for rotation about the longitudinal axis of the cylinder and having tumbler bore-forming means extending longitudinally therein, a plurality of tumblers received in said bore-forming means for reciprocal longitudinal movement therein, and a cap secured to a front end of the barrel and having an opening for insertion of a key therethrough, the combination of:

• a discrete facing member received in said barrel for rotation about said axis and interposed between said cap and said cylinder, said facing member having an opening arranged for registry with said cap opening and with said bore-forming means, and said facing member comprising hard material resistant to drilling,
• frangible means for orienting said facing member angularly with respect to said cylinder, and
• a discrete spacer received in said barrel for rotation about said axis and interposed between said facing member and said cylinder, said spacer having an opening arranged for registry with said cap opening and with said bore-forming means,
• said openings when in said registry receiving a key for insertion thereof into engagement with said tumblers.

In a cylinder lock mechanism including a tubular barrel, a lock cylinder received in the barrel for rotation about the longitudinal axis of the cylinder and having tumbler bore-forming means extending longitudinally therein, a plurality of tumblers received in said bore-forming means for reciprocal longitudinal movement therein, and a cap secured to a front end of the barrel and having an opening for insertion of a key therethrough, the combination of:

• a discrete facing member received in said barrel for rotation about said axis and interposed between said cap and said cylinder, said facing member having an opening arranged for registry with said cap opening and with said bore-forming means, and said facing member comprising hard material resistant to drilling,
• a discrete spacer received in said barrel for rotation about said axis and interposed between said facing member and said cylinder, said spacer having an opening arranged for registry with said cap opening and with said bore-forming means, and
• frangible means for orienting said spacer angularly with respect to said cylinder,
• said openings when in said registry receiving a key for insertion thereof into engagement with said tumblers.

In a cylinder lock mechanism, the combination of:

• a tubular barrel,
• a lock cylinder received in said barrel for rotation about the longitudinal axis of the cylinder and having tumbler bore-forming means extending longitudinally therein,
• a plurality of tumblers received in said bore-forming means for reciprocal longitudinal movement therein,
• an engagement member extending transversely of said cylinder for engagement with said tumblers and laterally movable to and from the tumblers,
• an elongated locking member extending longitudinally of said cylinder for engagement with said engagement member and laterally movable to and from said tumblers,
• means on said cylinder and said barrel respectively for engaging said locking member along its length for locking purposes,
• means on each of said tumblers for engaging said engagement member to support said locking member in a projecting position with respect to said cylinder and in engagement with said locking member-engaging means on said barrel for locking purposes, and
• means on each of said tumblers permitting said engagement member to move towards the tumblers, thereby to permit retraction of said locking member from said projecting position for unlocking purposes,
• said engagement member and said locking member being free-floating in the lock mechanism such that said engagement and locking members are free to tilt in respective directions transverse to each other.