Abstract: A readily adjustable door closure for varying the rate of speed at which an associated door may close which is effected by rotating the piston rod relative to the piston and associated cylinder assembly so as to vary the rate of flow of an actuating fluid flowing from one side of the piston to the other side of the piston, which controls the door closing speed accordingly.

Abstract: The present invention discloses door closers provided with automatic latching in any position along the stroke, and delayed action mechanism together with a mechanism to switch on and off the automatic latching and the delayed action operation modes. The function, on which the automatic latching and the delayed action functions are based, are described in detail and examples of embodiments in door closers provided with either automatic latching or delayed action or both are also described.

Abstract: This invention is directed to a door closer which is rendered optionally operative to effect either a controlled closing of the door upon opening or to automatically latch or arrest the door in the open position as may be desired. This is attained by a closer housing having a cylinder chamber and a connected latching chamber in which a piston is reciprocally mounted in the cylinder chamber which is biased by a compression spring toward the closed position. The piston rod connected to the piston extends through the end of the latching chamber and a latching member and an associated recoil spring is slidably disposed on the piston rod within the latching chamber. An arming device extends into the latching chamber which is shiftable between an armed position and an unarmed position.

Abstract: A door closer employing a cylinder having an end attachable to a door or door frame and slidably retaining a piston biased by a spring to a maximum retracted position in the cylinder. One end of a rod is attached to the piston and the other end extends from the cylinder and is attachable to a door frame or door. Confined to a short longitudinal space in the cylinder and riding on the rod, is a cantable washer. Structural members at the ends of the washer space in the cylinder maintain the washer in an essentially perpendicular orientation on the rod so that it may slide through the washer freely as the door is opened or closed. A positionable support, longitudinally buttressed from the cylinder, is introducible into the washer space so that the support may contact the washer on initiation of retraction of the rod into the cylinder causing the washer to cant, arrest the piston rod, and hold the door open. To unlatch the door, the positionable support is withdrawn to avoid canting contact with the washer.