Fluid door closer with means to permit entrapped gases to move

Details Fluid door closer with means to permit entrapped gases to move Fluid door closer with means to permit entrapped gases to move

1991-07-31

1993-11-09

Larson, Lowell A.

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

Checks and closers

Liquid

16 62, 16 51, 267 6428, E05F 300

Patent

active

052590909

ABSTRACT:
A door closer (20) is attachable to a door (24) and is formed with a chamber (44) in which a piston element (50) is movable to move fluid from the chamber to a reservoir (82) upon opening of the door. After the door (24) has been opened to a position, for example, of sixty to seventy-five degrees, continued opening of the door causes the fluid to be compressed within the chamber (44) and to be directed only through a back check valve (95) to the reservoir (82). This results in the development of an adjustable "back check" condition to provide a counterforce to the continued opening of the door. The adjustable valve (95) includes a spring biased ball (144), the biasing of which must be overcome by the force of the fluid being compressed in the chamber (44) to allow for fluid to pass through the valve to the reservoir (82).
The chamber (44) is formed partially by a spring tube (38) having slots (192) formed in the interior wall thereof which extend radially beyond convolutions of spring (52) contained within the tube. The slots (192) allow the fluid, and gas bubbles entrapped therein, to be moved beyond the convolutions of the spring (52) and to be moved unimpeded into the reservoir (82). Otherwise, the gas bubbles would be trapped in the chamber (44) and would deleteriously affect the operation of the door closer (20).

REFERENCES:
patent: 696776 (1902-04-01), Voight
patent: 1644045 (1927-10-01), Weeks
patent: 1941399 (1933-12-01), Ischebeck
patent: 2152740 (1939-04-01), Johansen
patent: 2209553 (1940-07-01), Bannenberg
patent: 2237915 (1941-04-01), Routson
patent: 2701383 (1955-02-01), Billeter
patent: 2971212 (1961-02-01), Voster et al.
patent: 3220047 (1965-11-01), Flint
patent: 3337902 (1967-08-01), Webb et al.
patent: 3396424 (1968-08-01), Russell et al.
patent: 3446317 (1969-05-01), Gryglas
patent: 3483585 (1969-12-01), Voster et al.
patent: 3584331 (1971-06-01), D'Hooge
patent: 3990548 (1976-11-01), Schupner
patent: 4048694 (1977-09-01), Newman et al.
patent: 4073033 (1978-02-01), Lexnas
patent: 4271869 (1981-06-01), Weidl et al.
patent: 4663800 (1987-05-01), Mettenleiter et al.
patent: 4673068 (1987-06-01), De Bruijn
patent: 4937913 (1990-07-01), Jentsch

Affiliated with

Also associated with

Rating

Fluid door closer with means to permit entrapped gases to move does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fluid door closer with means to permit entrapped gases to move, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid door closer with means to permit entrapped gases to move will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1134372