Locking device

A locking device comprising:

• a key;
• and
• a cylinder lock including an inner cylinder rotating by the key, wherein
• the key includes a cylindrical shaft having an open front end, and a guide groove axially formed on the shaft,
• the cylinder lock includes
• an outer cylinder including
• a cylindrical outer cylinder main body which is open at both axial ends, and
• an outer concave portion formed on an inner circumferential surface of the outer cylinder main body and engaged with a radially outer end of a cylindrical locking bar, wherein
• the outer cylinder is formed by arranging multiple outer concave portions in a circumferential direction of the outer cylinder main body,
• an inner cylinder including
• a bottomed cylindrical inner cylinder main body rotatably accommodated in the outer cylinder,
• a rod provided so as to protrude radially outward on a bottom outer surface of the inner cylinder main body,
• a key insertion guide coaxially provided on center of a bottom inner surface of the inner cylinder main body to guide an insertion direction of the key,
• a bar insertion hole configured to radially penetrate a key insertion slot and the inner cylinder main body, the bar insertion hole radially inserting the locking bar toward center of the inner cylinder main body, the key insertion slot being formed in an outer peripheral gap of the key insertion guide, and the key insertion slot being in which the key is inserted, and
• an engaged portion with which an engaging portion is engaged,
• a locking bar which straddles the bar insertion hole of the inner cylinder and the outer concave portion of the outer cylinder, and the locking bar being engaged with the inner cylinder and the outer cylinder to prevent rotation of the inner cylinder, and
• a tumbler including
• an annular tumbler main body having a central hole through which the key insertion guide of the inner cylinder is inserted,
• a guide convex portion which protrudes toward center of an inner periphery portion of a central hole of the tumbler main body and engages with the guide groove of the key,
• an engaging portion which is provided so as to protrude radially outward at an outer peripheral portion of the tumbler main body and is rotatably engaged with the engaged portion of the inner cylinder, and
• an inner concave portion formed on the outer peripheral portion of the tumbler main body and engaged releasably with a radially inner end of the locking bar, wherein
• the cylinder lock is configured such that, when the shaft of the key is inserted inward along the key insertion guide from the key insertion slot of the inner cylinder,
• the tumbler having the guide convex portion engaged with the guide groove of the key is rotated in accordance with guide of the guide groove of the key to align the inner concave portion with a position of the locking bar,
• the locking bar is inserted into the bar insertion hole of the inner cylinder at start of rotation of the inner cylinder,
• a locked state of the inner cylinder and the outer cylinder is released by dropping the cylinder lock toward the inner concave portion side of the tumbler, and
• the inner cylinder is rotated by a predetermined angle.