Patents Assigned to Reading Door Closer Corp.
  • Door closer with assist or door operating features
    Patent number: 4222147
    Abstract: Hydraulic door closer apparatus includes means for counter-balancing the bias of a return spring, to either assist in opening the door by reducing the force needed to open, or, in an alternative embodiment and mode of operation, to open the door by over-balancing the bias of the return spring. In the latter mode, a remotely manually operable switch, such as, for example, a so-called palm button, may initiate opening the door.
    Type: Grant
    Filed: March 20, 1978
    Date of Patent: September 16, 1980
    Assignee: Reading Door Closer Corp.
    Inventor: L. Nelson Burnett, Jr.
  • Temperature compensating hydraulic door closer
    Patent number: 4148111
    Abstract: Hydraulic door closer apparatus comprises a cylinder, a piston disposed in the cylinder, linkage means coupled to the piston for transmitting forces between the piston and a door, and a hydraulic circuit for controlling movement of the piston in the cylinder. A temprature responsive control element is provided in the hydraulic circuit to alter the characteristics of the circuit in response to changes in ambient temperature or temperature of the fluid within the closer.
    Type: Grant
    Filed: November 30, 1977
    Date of Patent: April 10, 1979
    Assignee: Reading Door Closer Corp.
    Inventor: Sideny Lieberman