Hydraulic door closer with adjustable time delay dampener

Details Hydraulic door closer with adjustable time delay dampener Hydraulic door closer with adjustable time delay dampener

1976-03-01

1977-09-20

Schroeder, Werner H.

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

Checks and closers

Liquid

16DIG21, E05F 310, E05F 312

Patent

active

040486940

ABSTRACT:
A door closer of the kind having a piston slidably mounted in a bore containing hydraulic fluid and dividing that bore into damping and reservoir chambers. Drive means is connected to the piston to respond to sliding movement of the piston and translate that into rotary motion for driving door connected linkage. The piston is spring influenced in a direction towards the damping chamber, and fluid pressurized by the piston tending to move in that direction bleeds from the damping chamber through an escape port which is controlled by a biased and movable closure member. Normally the closure member is biased into a rest position in which it blocks passage of fluid through the escape port, but it responds to fluid pressure in the damping chamber to move into an open position at which fluid can bleed through the escape port. The time taken for the closure member to travel from the rest to the open position is a delay time during which the piston is freed from external influence so as to be movable in a door closing direction, but is temporarily restrained against such movement by the closure member. That delay time can be varied by adjusting the rest position of the closure member and/or by adjusting the rate of fluid flow from the escape port to the reservoir chamber.

REFERENCES:
patent: 2586135 (1952-02-01), Woodruff
patent: 2688150 (1954-09-01), Roussel
patent: 3079629 (1963-03-01), Millard et al.
patent: 3875612 (1975-04-01), Poitras
patent: 3887961 (1975-06-01), Saajos

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