Door hold open device
AssigneeMotus Co., Ltd.
InventorsRobert C. Gudgel, William Baker
Life of this patent
Estimating the term…
Abstract
A door hold open device for use with fire doors connected to a door closer unit. The hold open device has a latching means that automatically unlatches if the power supply drops below a predetermined threshold or a person attempts to disconnect the power supply. The device includes an electrical actuating means for unlatching the held open door. The actuating means allows a door to be latched open without constant current being supplied to the actuating means, so battery power is possible. The invention may be used with any door closer unit, does not require special wiring, and may include a self-contained power supply and an integral smoke detector.
Claims14
A releasable door hold open device, comprising:
- a latching means for latching a door in an open position without continuous application of energy,
- electrical power supply receiving means, and
- power sensing means operatively connected to said power supply receiving means and said latching means to prevent the latching means from latching a door in an open position when the power from the power supply receiving means falls below a predetermined threshold, said threshold being high enough that the power is sufficient to unlatch said latching means.
A releasable door hold-open device, comprising:
- an actuable latching means for latching a door in an open position,
- electrical power supply receiving means, and
- power sensing means operatively connected to said power supply receiving means and said latching means to prevent the latching means from latching a door in an open position when the power from the power supply receiving means is below a predetermined threshold, said theshold being high enough that the power is sufficient to actuate said latching means.
Dependencies are inferred from the claim text.