Patent ID: 6758073
Filing Date: 2004-07-06
Classification: E05B,Y10T

Abstract:
A lock assembly, comprising:a lock cylinder for actuating a latch assembly wherein said lock cylinder comprises: a lock sleeve having an axial rotor hole and a plurality of first and second tumbler sockets radially distributed on an inner surface of said lock sleeve; a plurality of tumblers being coaxially placed in said first and second tumbler sockets respectively; a lock rotor assembly, comprising: a first lock rotor, having a tubular shaped, being rotatably and coaxially fitted in said axial rotor hole of said lock sleeve to define a first keyway therethrough, said first lock rotor having a plurality of first locking holes radially distributed on an outer circumferential surface of said first lock rotor, wherein each of said first locking holes is capable of coaxially aligning with said first tumbler sockets respectively; a second lock rotor, having a tubular shaped, being rotatably and coaxially fitted in said axial rotor hole of the lock sleeve to define a second keyway therethrough wherein said second keyway is normally misaligned with said first keyway so as to block up an arrangement of said tumblers within said first locking holes, said second lock rotor having a plurality of second locking holes radially distributed on an outer circumferential surface of said second lock rotor, wherein each of said first locking holes is capable of coaxially aligning with said second tumbler sockets respectively; a plurality of lock pins being disposed in said first and second locking holes respectively; a lock cover coaxially mounted on said lock sleeve at an entrance of said axial rotor hole, wherein said lock cover has a key access slot, having a predetermined length, coaxially formed thereon, said key access slot being normally aligned with said first keyway of said first lock rotor in such a manner that said key head of said key is adapted to insert into said first keyway through said key access slot; a key aligning arrangement for aligning said first lock rotor in an initial position normally and enabling said first lock to be rotated to align said first keyway with said second keyway; and a plurality of resilient elements being coaxially disposed in said first and second tumbler sockets respectively and applying urging pressures on said tumblers to move inwardly towards said first and second locking holes until an inner portion of each of said tumblers is disposed in said respective first and second locking hole and an outer portion of said tumbler is disposed in said respective first and second tumbler socket so as to lock up rotational movements of said first and second lock rotors within said lock sleeve; and a key comprising a key head and an elongated key body, wherein said key head comprises at least a radial protrusion radially extended from said key head at a predetermined radial direction, wherein said radial protrusion has a plurality of locking serrations arranged in such a manner that when said key head is inserted into said first keyway, wherein said key body is rearwardly extended from said key head, wherein when said key head is inserted into said second keyway, said key body is positioned within said first keyway in such a manner that when said second lock rotor is driven to rotate by said key head, said first lock rotor is remained in position, wherein said locking serrations of said key head are adapted to drive said respective lock pins to pull said respective tumblers moving outwardly into said first tumbler sockets correspondingly to unlock said first lock rotor and enable said first lock rotor freely rotating until said first keyway is aligned with said second keyway, simultaneously, said key head being adapted to insert into said second keyway such that said locking serrations of said key head are adapted to drive said respective lock pins to null said respective tumblers moving outwardly into said second tumbler sockets correspondingly so as to unlock said second lock rotor to enable said second lock rotor to freely rotate to control said locking and unlocking of said latch assembly, wherein said key aligning arrangement comprises a protrusion outwardly extended from said key and first and second indicators provided on an outer side of said lock cover, wherein when said key head is inserted into said first keyway, said protrusion on said key is pointed to said first indicator, and when said first lock rotor is rotated by said key head until said protrusion is pointed to said second indicator, said first keyway is aligned with said second keyway so that said key head is allowed to insert into said second keyway.