Keylock mechanism

Claim 2

A lock mechanism adapted to be unlocked by a guest key and changed in combination by an engineer''s key comprising: a housing holding an outer chamber having a central bore and a plurality of closely fitting inner and middle cylinder segments, each assembly of cylinder segments forming a plurality of radial chambers in communication with said central bore; a series of middle cylinder segments rotatably mounted in said bore having a plurality of holes aligned with said radial chambers; said series of inner cylinder segments rotatably mounted in coaxial alignment with said middle cylinder and having a plurality of holes aligned with said middle cylinder holes; an elongated plug rotatably carried on and in coaxial relationship with said inner cylinder segments having a keyway and a plurality of holes aligned with said inner and middle cylinder holes; a tumbler pin assembly resiliently carried in each of said radial chambers and extending through respective aligned inner and middle cylinder segments and plug holes extending into said plug keyway; means connecting between said inner and middle cylinder segments and said plug for selectively aligning said holes in said cylinders and said plug with respect to each other so that a multiplicity of tumbler pin combinations can be chosen in response to insertion of the engineer''s key into said plug keyway; and said tumbler pin assemblies being operative to permit rotation of selected ones of said inner cylinder segments and said plug as a unit to effect release of the lock in response to insertion of the guest key into said plug keyway.

Claim 3

A lock mechanism adapted to be unlocked by a guest key and changed in combination by an engineer''s key comprising: a housing holding an outer chamber having a central bore and a plurality of radial chambers in communication with said central bore; a middle cylinder rotatably mounted in said bore having a plurality of holes aligned with said radial chambers; an inner cylinder rotatably mounted in and coaxial with said middle cylinder having a plurality of holes aligned with said middle cylinder holes; an elongated plug rotatably carried on and in coaxial relationship with said inner cylinder having a keyway and a plurality of holes aligned with said inner cylinder holes; a tumbler pin assembly resiliently carried in each of said radial chambers and extending through respective aligned cylinder and plug holes into said plug keyway; means connecting between said inner cylinder and plug for selectively aligning said holes in said cylinders and said plug with respect to each other so that a multiplicity of tumbler pin combinations can be chosen in response to insertion of the engineer''s key into said plug keyway; said outer cylinder is fixedly secured to said housing and said middle cylinder, said inner cylinder and said plug are all coaxially disposed and adapted to rotate independently of each other or selectively together as a unit as predetermined by the individual dimensional length of each of said pins in each of said assemblies; said middle cylinder is segmented along its length to permit separate rotation of each of said segments; and gear means interconnected between said segments for selectively rotating said segments upon insertion and rotation of the engineerkey.

Claim 4

A lock mechanism adapted to be unlocked by a guest key and changed in combination by an engineer''s key comprising: a housing holding an outer chamber having a central bore and a plurality of radial chambers in communication with said central bore; a middle cylinder rotatably mounted in said bore having a plurality of holes aligned with said radial chambers; an inner cylinder rotatably mounted in and coaxial with said middle cylinder having a plurality of holes aligned with said middle cylinder holes; an elongated plug rotatably carried on and in coaxial relationship with said inner cylinder having a keyway and a plurality of holes aligned with said inner cylinder holes; a tumbler pin assembly resiliently carried in each of said radial chambers and extending through respective aligned cylinder and plug holes into said plug keyway; means connecting between said inner cylinder and plug for selectively aligning said holes in said cylinders and said plug with respect to each other so that a multiplicity of tumbler pin combinations can be chosen in response to insertion of the engineer''s key into said plug keyway; said outer cylinder is fixedly secured to said housing and said middle cylinder, said inner cylinder and said plug are all coaxially disposed and adapted to rotate independently of each other or selectively together as a unit as predetermined by the individual dimensional length of each of said pins in each of said assemblies; said middle cylinder is segmented along its length to permit separate rotation of each of said segments; and gear means interconnected between said segments for selectively rotating said segments upon insertion and rotation of the engineerkey.

Claim 5

A lock mechanism adapted to be unlocked by a guest key and changed in combination by an engineer''s key comprising: a housing holding an outer chamber having a central bore and a plurality of radial chambers in communication with said central bore; a middle cylinder rotatably mounted in said bore having a plurality of holes aligned with said radial chambers; an inner cylinder rotatably mounted in and coaxial with said middle cylinder having a plurality of holes aligned with said middle cylinder holes; an elongated plug rotatably carried on and in coaxial relationship with said inner cylinder having a keyway and a plurality of holes aligned with said inner cylinder holes; a tumbler pin assembly resiliently carried in each of said radial chambers and extending through respective aligned cylinder and plug holes into said plug keyway; each of said tumbler pin assemblies includes a plurality of coaxially disposed pins; means connecting between said inner cylinder and said plug for selectively aligning said holes in said cylinders and said plug with respect to each other so that a multiplicity of tumbler pin combinations can be chosen in response to insertion of the engineer''s key into said plug keyway; said tumbler pin assemblies being operative to permit rotation of said inner cylinder and said plug as a unit to effect release of the lock in response to insertion of the guest key into said plug keyway; said middle cylinder comprises a plurality of coaxial cylinder segments adapted to rotate about said inner cylinder independently of each other; and means carried on said middle cylinder segments for selectively rotating said middle cylinder segments with respect to each other to effect alignment of selected ones of said tumbler pins in one of said assemblies with said tumbler pins in another one of said assemblies.

Claim 6

A lock mechanism adapted to be unlocked by a guest key and changed in combination by an engineer''s key comprising: a housing holding an outer chamber having a central bore and a plurality of radial chambers in communication with said central bore; a middle cylinder rotatably mounted in said bore having a plurality of holes aligned with said radial chambers; an inner cylinder rotatably mounted in and coaxial with said middle cylinder having a plurality of holes aligned with said middle cylinder holes; an elongated plug rotatably carried on and in coaxial relationship with said inner cylinder having a keyway and a plurality of holes aligned with said inner cylinder holes; a tumbler pin assembly resiliently carried in each of said radial chambers and extending through respective aligned cylinder and plug holes into said plug keyway; each of said tumbler pin assemblies includes a plurality of coaxially disposed pins; means connecting between said inner cylinder and said plug for selectively aligning said holes in said cylinders and said plug with respect to each other so that a multiplicity of tumbler pin combinations can be chosen in response to insertion of the engineer''s key into said plug keyway; said tumbler pin assemblies being operative to permit rotation of said inner cylinder and said plug as a unit to effect release of the lock in response to insertion of the guest key into said plug keyway; said middle cylinder comprises a plurality of coaxial cylinder segments adapted to rotate about said inner cylinder independently of each other; and means carried on said middle cylinder segments for selectively rotating said middle cylinder segments with respect to each other to effect alignment of selected ones of said tumbler pins in one of said assemblies with said tumbler pins in another one of said assemblies.

Claim 7

The invention as defined in claim 3 wherein said connecting means comprises a ratchet mechanism having a pawl pivotally carried on one end of said plug and a plurality of ratchet teeth carried on one end of said inner cylinder.

Claim 8

The invention as defined in claim 3 wherein said rotating means includes a 360* ring gear fixed on selected ones of said middle cylinder segments and a quarter gear fixed on selected ones of said middle cylinder segments; and a rotatable shaft mounted on said housing carrying pinion gears meshed with each of said ring gears respectively, and selectively meshed with certain ones of said quarter gears.

Claim 9

The invention as defined in claim 3 wherein said pin tumbler assemblies each include a plurality of coaxially disposed pins of varying lengths but having the same combined dimensioned length; and selected ones of said pins in each of said assemblies being adapted to be combined with adjacent assemblies upon rotation of said middle and inner cylinders to effect lock combination change.

Claim 10

The invention as defined in claim 3 including key registration means carried on said housing adapted to releasably engage with a cutout formed in said engineer''s key or said guest key.

Claim 11

The invention as defined in claim 3 wherein said outer cylinder is fixedly secured to said housing and said middle cylinder, said inner cylinder and said plug are all coaxially disposed and adapted to rotate independently of each other or selectively together as a unit as predetermined by the individual dimensional length of each of said pins in each of said assemblies.

Claim 12

The invention as defined in claim 3 wherein said middle cylinder is segmented along its length to permit separate rotation of each of said segments; and gear means interconnected between said segments for selectively rotating said segments upon insertion and rotation of the engineer''s key.

Claim 13

The invention as defined in claim 2 wherein said gear means includes a ring gear and a quarter gear carried on selected ones of said middle cylinder segments; and pinion gears rotatably carried on said housing meshed with said ring gears and selectively meshed with said quarter gears so that said ring gear carried by one segment and said quarter gear carried by another segment are engaged simultaneously.

Claim 14

The invention as defined in claim 2 wherein said inner cylinder is segmented along its length and each of its segments are adapted to rotate independently.