초록 ▼

An improved clock lock of the type using an electronic timer circuit as clock mechanism is disclosed. A locking member is actuated toward the unlocked state in response to unlocking signal generated by the electronic timer circuit. The clock lock includes motors adapted to be activated in response t

An improved clock lock of the type using an electronic timer circuit as clock mechanism is disclosed. A locking member is actuated toward the unlocked state in response to unlocking signal generated by the electronic timer circuit. The clock lock includes motors adapted to be activated in response to unlocking signal, cams in operative association with the motors, a movable plate normally held in the locked state in the casing to move toward the unlocked state by means of a first cam when any one of the motors starts its rotation, a locking member normally held at the locked position on the movable plate in the casing to turn to the unlocked position by the effect of moment caused by its own dead weight when it is released from the locked state, and a motor driving circuit which is so designed that none of the motors is activated toward the locked state as long as any one of the motors has failed to finish rotation toward the unlocked state by means of microswitches which are in operative association with second cams. Usually, the locking member is designed in the form of an unbalancedly weighted lever. The first cam is preferably designed in the form of a circular cam which is eccentrically mounted on the cam shaft, while each of the second cams is designed in the form of a sector cam. One of the second cams is mounted on the cam shaft at a delayed angle relative to other ones.

대표청구항 ▼

A clock lock of the type using an electronic timer circuit as a clock mechanism so that a locking member in a lock mechanism is actuated toward an unlocked state in response to an unlocking signal generated by said electronic timer circuit, comprising: at least one motor adapted to be activated in r

A clock lock of the type using an electronic timer circuit as a clock mechanism so that a locking member in a lock mechanism is actuated toward an unlocked state in response to an unlocking signal generated by said electronic timer circuit, comprising: at least one motor adapted to be activated in response to the unlocking signal transmitted from the electronic timer circuit, a first cam and a second cam in operative association with said at least one motor, a spring means having a movable member normally held in a locked state, said movable member being displaced toward an unlocked state by said first cam when said at least one motor starts its rotation, a locking member held at a locked position by the movable member, said locking member being turned to an unlocked position by the effect of a turning moment caused by its own dead weight when it is released from the locked position, a plurality of microswitches, in operative association with said second cam, for turning on and off driving voltage for said at least one motor, and a motor driving circuit adapted so that said at least one motor is not actuated to turn said movable member toward a locked state until said at least one motor has failed to finish rotation toward an unlocked state.