Door closer with rack and pinion, spring, and spring mounting pl

Details Door closer with rack and pinion, spring, and spring mounting pl Door closer with rack and pinion, spring, and spring mounting pl

1991-05-24

1993-02-23

Larson, Lowell A.

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

Checks and closers

Liquid

16 59, 16 58, E05F 310

Patent

active

051878356

ABSTRACT:
A door closer includes a body having a closed, fluid-filled cylinder. A piston is slidably mounted in the cylinder and has an actuating rod with rack gearing. A pinion is rotatably mounted on the body for meshing with the rack gearing of the actuating rod to axially move the piston. The closer also has a valve that can bypass fluid past the piston to regulate its motion. A spring mounted outside the cylinder can apply a balanced, substantially axial force to the actuating rod for axially urging the piston.

REFERENCES:
patent: 713267 (1902-11-01), Wolf
patent: 1595171 (1924-10-01), Shonnard
patent: 1595723 (1926-08-01), Norton
patent: 3446317 (1969-05-01), Gryglas
patent: 3618160 (1971-11-01), Ellis
patent: 4048694 (1977-09-01), Newman et al.
patent: 4050114 (1977-09-01), Zunkel
patent: 4073033 (1978-02-01), Lexnas
patent: 4097956 (1978-07-01), Kitutaka
patent: 4115847 (1978-09-01), Zunkel
patent: 4234996 (1980-11-01), Jentsch
patent: 4378612 (1983-04-01), Beers
patent: 4386446 (1973-06-01), Zunkel et al.
patent: 4502180 (1985-03-01), Harrison et al.
patent: 4660250 (1987-04-01), Tillman et al.
patent: 4847946 (1989-07-01), Nam et al.

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