A keyed cylinder assembly for a door lock comprising, in combination:
- a keyed cylinder (3) adapted to be mounted in a door lock (1) having a latch bolt (12) and a deadbolt (13), with keyed cylinder (3) including a hollow body (31) and a cylinder plug (32) rotatably received in the hollow body (31) about an axis, with the cylinder plug (32) including front and rear ends (321,322) spaced along the axis and an outer periphery (320) surrounding the axis, with the cylinder plug (32) further including a keyway (323) extending from the first end (321) through the second end (322) along the axis and extending from an interior of the cylinder plug (32) to the outer periphery (320) in a radial direction perpendicular to the axis, with the keyway (323) including a radial outer portion (326) in the outer periphery (320) and extending along the axis, with the cylinder plug (32) further including an annular groove (327) formed in the outer periphery (320) and intersecting the radial outer portion (326) of the keyway (323), with the keyed cylinder (3) further including a first arresting member (33) received in the hollow body (31) and having an inner end (331) received in the annular groove (327) of the cylinder plug (32), with the inner end (331) of the first arresting member (33) having a first length along the axis;
- a first key (4) including a first blade (41) insertable into the keyway (323) of the cylinder plug (32), with the first blade (41) including a side (44) extending along the axis. with a notch (45) being formed in the side (44) of the first blade (41) and having a second length along the axis not smaller than the first length, with the side (44) of the first blade (41) being received in the radial outer portion (326) of the keyway (323) when the first blade (41) is received in the keyway (323);
- a second key (5) including a second blade (51) insertable into the keyway (323) of the cylinder plug (32), with the second blade (51) including a side (54) extending along the axis, with the side (54) of the second blade (51) being received in the radial outer portion (326) of the keyway (323) and a portion of the second side (54) being received in the annular groove (327) of the cylinder plug (32) when the second blade (51) is received in the keyway (323);
- wherein when the first blade (41) of the first key (4) is inserted into the keyway (323) of the cylinder plug (32) and rotated, the cylinder plug (32) rotates together with the first key (4), and the inner end (331) of the first arresting member (33) is received in the notch (45) when the outer end (326) of the keyway (323) of the cylinder plug (32) rotates to a first position in alignment with the inner end (331) of the first arresting member (33), allowing 360° rotation of the cylinder plug (32) in the hollow body (31) for unlocking both the latch bolt (12) and the deadbolt (13) of the door lock (1), and
- wherein when the second blade (51) of the second key (5) is inserted into the keyway (323) of the cylinder plug (32) and rotated in a first direction, the cylinder plug (32) rotates together with the second key (5) until the portion of the second side (54) of the second key (5) contacts and is stopped by the inner end (331) of the first arresting member (33) when the radial outer portion (326) of the keyway (323) of the cylinder plug (32) rotates to a second position adjacent to the inner end (331) of the first arresting member (33), allowing unlatching the latch bolt of the door lock but not allowing 360° rotation of the cylinder plug (32) in the hollow body (31) for unlocking the deadbolt (13) of the door lock (1).