Door lock equipped with indicator
Disclosed is a door lock equipped with an indicator, the door lock being configured such that a first small spindle support is rotated forwards along a spiral guide groove when a lock button assembly of a body assembly is pressed, a small spindle cam is rotated along the first small spindle support during operation of the first small spindle support, an indicator cam coupled to an outer spring cage of a lock indicator assembly is rotated clockwise so as to allow “IN USE” displayed on an upper display part of the indicator cam and a lower display part of the outer spring cage to be exposed to the outside, and the indicator cam is rotated counterclockwise so as to allow “VACANT” displayed on an upper display part of the outer spring cage and a lower display part of the indicator cam to be exposed to the outside.
1 . A cylindrical-shaped door lock equipped with an indicator, the door lock comprising:
a body assembly;
a latch assembly coupled to a front side of the body assembly;
an inner plate assembly coupled to an inner portion of the body assembly with an inner mounting plate interposed therebetween;
a lock indicator assembly coupled to an outer portion of the body assembly with an outer mounting plate interposed therebetween;
an inner lever coupled to the body assembly from an outside of the inner plate assembly; and
an outer lever coupled to the body assembly from an outside of the lock indicator assembly,
wherein, when a lock button assembly coupled to an inner spindle of the body assembly is moved forwards, a first small spindle support of a small spindle assembly coupled to an outer spindle is rotatably moved forwards along a second small spindle support so as to rotate a small spindle cam,
wherein, when the small spindle cam is rotated, an indicator cam of the lock indicator assembly is rotated clockwise such that “IN USE” displayed on an upper display part of the indicator cam and “IN USE” displayed on a lower display part of an outer spring cage are exposed to an outside through display windows respectively provided at an upper portion and a lower portion of an outer plate,
wherein, when the lock button assembly is moved rearwards by the inner lever or a cylinder of the body assembly, the first small spindle support and the second small spindle support of the small spindle assembly return to initial positions thereof by a spring, and
wherein, when the small spindle cam is freed by return of the first small spindle support, the indicator cam of the lock indicator assembly is rotated counterclockwise by a torsion spring such that “VACANT” displayed on an upper display part of the outer spring cage and “VACANT” displayed on a lower display part of the indicator cam are exposed to the outside through the display windows respectively provided at the upper portion and the lower portion of the outer plate.
2 . The door lock according to claim 1 , wherein the small spindle assembly comprises:
a small spindle having a cylindrical operation chamber formed by a side plate having a locking hole provided therein, the small spindle having an arc-shaped guide groove formed in a rear portion of an outer side thereof, the small spindle having a straight guide groove and a spiral guide groove formed in a central portion of a body thereof;
the small spindle cam inserted into the operation chamber of the small spindle and coupled to the arc-shaped guide groove through a pin formed on a rear portion of a body thereof, the small spindle cam having a pair of guide ribs formed on an inner wall of the locking hole;
a pair of washers each coupled to the straight guide groove through a coupling piece in the operation chamber of the small spindle;
a spring coupled between the pair of washers;
the first small spindle support inserted into the operation chamber of the small spindle and coupled to the spiral guide groove through a pin formed to protrude from a central portion of a body of the first small spindle support, the first small spindle support having a locking piece formed on an outer side of the body of the first small spindle support and locked with the small spindle cam, the first small spindle support having a coupling groove formed in an inner side of the body of the first small spindle support; and
the second small spindle support having a coupling protrusion formed on an outer side of a body thereof and coupled to the coupling groove in the first small spindle support, the second small spindle support having a locking piece formed on a rear portion of an inner side of the body of the second small spindle support and locked with the small spindle.
3 . The door lock according to claim 1 , wherein the lock indicator assembly comprises:
the outer spring cage having the upper display part formed on an upper outer surface thereof, the upper display part being configured to display “VACANT”, and the lower display part formed on a lower outer surface thereof, the lower display part being configured to display “IN USE”;
a rotation spring coupled to the outer spring cage through a spring holder;
a spring holder cover configured to fix the spring holder to the outer spring cage;
an indicator cam having a display part formed on an upper outer surface thereof, the display part on the upper outer surface of the indicator cam being configured to display “IN USE”, and a display part formed on a lower outer surface thereof, the display part on the lower outer surface of the indicator cam being configured to display “VACANT”, the indicator cam having a locking piece formed on an inner central portion thereof and locked with the small spindle cam of the small spindle assembly, the indicator cam being connected to the outer spring cage by a shaft pin such that elasticity is provided in a counterclockwise direction by the torsion spring.