Door closer

Details Door closer Door closer

1976-03-18

1977-12-27

Schroeder, Werner H.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Checks and closers

Liquid

16 60, E05F 322

Patent

active

040645894

ABSTRACT:
Disclosed herein is a device for closing swinging doors which is mounted in a door frame and has an elongated housing with a spindle rotatably mounted in one end thereof by which the door closer is secured to a door. A cylinder is interiorly formed in the other end of the housing and has a piston disposed therein. The piston rod extends from the cylinder and is secured at its extended end to a pair of flat carrier plates which are slidably mounted within the housing about the spindle and biased to maintain the door in a closed position. Camming surfaces are carried by the spindle which cooperate with a pair of cam followers carried by the carrier plates to hold the door in an open position. Valve means communicating with the cylinder are provided to permit fluid flow from one end of the cylinder to the other about the piston for controlling the rate of travel of the piston within the cylinder and thereby regulate the rate of movement of the door as it is being opened, closed and latched.

REFERENCES:
patent: 1177642 (1916-04-01), Lonbom et al.
patent: 1833121 (1931-11-01), Norton
patent: 2700175 (1955-01-01), Carlson
patent: 3246362 (1966-04-01), Jackson
patent: 3724023 (1973-04-01), Tillmann

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