Door closer

Details Door closer Door closer

1981-03-03

1983-06-07

Bell, Paul A.

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

Checks and closers

Liquid

16DIG21, E05F 300

Patent

active

043864465

ABSTRACT:
A door closer for regulating the movement of a door panel with respect to its frame has a body enclosing a chamber and an adjacent cylinder having a head. A piston is reciprocable in the cylinder toward and away from the head and in accordance with the door panel motion. A spring in the chamber urges the piston toward the head. A duct through the piston controlled by a check valve permits liquid flow from the chamber to the cylinder, but not vice versa. A passage in the body extends between the cylinder, near the head, and the chamber. In that passage near the head is a throttle valve for restricting liquid flow, and in the passage near the chamber is a bypass valve for restricting liquid flow and for permitting increased flow under increased liquid pressure. There is also a bore in the body extending between the passage intermediate the throttle valve and the bypass valve and an adjacent part of the cylinder traversed by the piston.

REFERENCES:
patent: 1711879 (1930-07-01), Dowd et al.
patent: 2940111 (1960-06-01), Patriquin
patent: 3449789 (1969-06-01), Russell et al.
patent: 4115897 (1978-09-01), Zunkel

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