An alarm for a door is operable to generate an alarm signal when a rotary grip member of the door is rotated to a particular position, such as an unlocked position. The alarm comprises a housing having a strap retainer configured to receive and retain a strap to hold the housing to the rotary grip member. The alarm comprises a tilt switch for switching when the housing is tilted. Control circuitry is interconnected to the tilt switch and to an annunciator and is operable to activate the annunciator dependent on a state of the tilt switch.

An automatic-alarming push-down type emergency door-locking device, disposed at a door board, includes a main lock seat, a secondary lock seat, a push-down type handle assembly, a position-sensing module and an alarm module. The main and secondary lock seats are disposed at the door board, and the main lock seat has at least one locking element. In the push-down type handle assembly, a first handle and a second handle are connected pivotally with the secondary and main lock seats to be moved along a driving path from a locking position toward an unlocking position. At the locking or unlocking position, the locking element is buckled with or separated from the at least one locking groove. The position-sensing module transmits an alarm-triggering signal for the alarm module to generate an alarm, upon when the first handle leaves the locking position.

A delayed unlocking push-down type emergency door-locking device includes a main lock seat, a secondary lock seat, a push-down type handle assembly, a position-sensing module and a timing electromagnetic traction assembly. The push-down type handle assembly is configured for moving along a driving path from a locking position toward an unlocking position, thereby at least one of locking element of the main lock seat is separated from a locking groove to unlock. A stopper is disposed at the secondary lock seat, configured for moving between a stop position and an avoidance position. The timing electromagnetic traction assembly is configured for counting time upon when the position-sensing module detects the push-down type handle assembly is separated from the locking position, and for pulling the stopper from the stop position to the avoidance position after delaying a predetermined delay time to the unlocking position for delaying.

A delayed unlocking push-down type emergency door-locking device includes a main lock seat, a secondary lock seat, a push-down type handle assembly, a position-sensing module and a timing electromagnetic traction assembly. The push-down type handle assembly is configured for moving along a driving path from a locking position toward an unlocking position, thereby at least one of locking element of the main lock seat is separated from a locking groove to unlock. A stopper is disposed at the secondary lock seat, configured for moving between a stop position and an avoidance position. The timing electromagnetic traction assembly is configured for counting time upon when the position-sensing module detects the push-down type handle assembly is separated from the locking position, and for pulling the stopper from the stop position to the avoidance position after delaying a predetermined delay time to the unlocking position for delaying.

A door knob assembly that provides an interactive visual and aural assembly familiar to a room occupant and that responds to variations in the manner of rotation of the knob in a plurality of responses, depending on the direction and rate of rotation applied to the knob, providing messages appropriate to the entertainment, safety and/or training of the knob operator and/or room occupant.