Patent attributes
A door hold and release mechanism is provided including a housing mounted onto the pneumatic cylinder of a door check or closer having a piston rod extending from one end of the cylinder. The piston rod passes through an oversized hole in a drop stop which restricts movement of the piston rod when the drop stop is tilted. A cap button is mounted on top of the housing and is connected to one end of an elongated shaft disposed in the housing. A spring exerts a bias pressure on the shaft which opposes the external force applied to the shaft when the cap button is depressed. A draw bar extends outwardly through the housing and is connected at one end to the drop stop. A cam action linkage connects the other end of the draw bar to the opposite end of the shaft. The linkage includes an elongated cam slot formed within the end of the shaft and a pin which extends through the slot and the rearward end of the draw bar. The slot is inclined at an angle such that the draw bar is forced to move laterally and rearwardly in response to the external force applied to the shaft. This action causes the drop stop to tilt and engage the piston rod thereby holding the door open for passage of the operator.
