Door closer with assist or door operating features
First Claim
1. Hydraulic door closer apparatus comprising a housing having a cylinder therein, a piston disposed in said cylinder, force transmitting means operatively coupled to said piston for transmitting forces to and from said piston to control movement of a door, biasing means in said cylinder in force-transmitting engagement with said piston for biasing said piston toward a rest position, actuator means operatively coupled to said piston for selectively applying to said piston force in opposition to said biasing means, said actuator means being secured to said housing and including a force-transmitting member in force-transmitting engagement with said piston and operable in a direction parallel to the axis of said cylinder and said piston to oppose said biasing means, said actuator means being a fluid actuator of the pneumatic type, and control means operatively coupled to said actuator means for selectively operating said actuator means, said control means comprising a source of air pressure, conduit means coupled to said source and said actuator means, a fluid relay disposed in said conduit means, and manually operable means operatively associated with said conduit means for selectively operating said fluid relay and placing said actuator means in fluid communication with said source, said manually operable means comprising time-responsive means for interrupting fluid communication between said source and said actuator when said time-responsive means times out, and valve means operatively coupled to said fluid relay, said time-responsive means and said source, so that actuation of said valve means causes said time-responsive means to operate, said time-responsive valve being so constructed and arranged that said actuator means is rendered inoperative when said time-responsive means is timed out.
5 Assignments
0 Petitions
Accused Products
Abstract
Hydraulic door closer apparatus has associated with it means for counter-balancing the bias of a return spring, to assist in opening the door by reducing the force needed to open it, or to open the door by over-balancing the bias of the return spring. Remotely manually operable means may initiate opening of the door.
43 Citations
10 Claims
- 1. Hydraulic door closer apparatus comprising a housing having a cylinder therein, a piston disposed in said cylinder, force transmitting means operatively coupled to said piston for transmitting forces to and from said piston to control movement of a door, biasing means in said cylinder in force-transmitting engagement with said piston for biasing said piston toward a rest position, actuator means operatively coupled to said piston for selectively applying to said piston force in opposition to said biasing means, said actuator means being secured to said housing and including a force-transmitting member in force-transmitting engagement with said piston and operable in a direction parallel to the axis of said cylinder and said piston to oppose said biasing means, said actuator means being a fluid actuator of the pneumatic type, and control means operatively coupled to said actuator means for selectively operating said actuator means, said control means comprising a source of air pressure, conduit means coupled to said source and said actuator means, a fluid relay disposed in said conduit means, and manually operable means operatively associated with said conduit means for selectively operating said fluid relay and placing said actuator means in fluid communication with said source, said manually operable means comprising time-responsive means for interrupting fluid communication between said source and said actuator when said time-responsive means times out, and valve means operatively coupled to said fluid relay, said time-responsive means and said source, so that actuation of said valve means causes said time-responsive means to operate, said time-responsive valve being so constructed and arranged that said actuator means is rendered inoperative when said time-responsive means is timed out.
Specification