US 5,630,248 AGranted

Door closer with semi-automatic latching

OwnerValentin Lucainventor

Life of this patent

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Abstract

A door closer employing a cylinder having an end attachable to a door or door frame and slidably retaining a piston biased by a spring to a maximum retracted position in the cylinder. One end of a rod is attached to the piston and the other end extends from the cylinder and is attachable to a door frame or door. Confined to a short longitudinal space in the cylinder and riding on the rod, is a cantable washer. Structural members at the ends of the washer space in the cylinder maintain the washer in an essentially perpendicular orientation on the rod so that it may slide through the washer freely as the door is opened or closed. A positionable support, longitudinally buttressed from the cylinder, is introducible into the washer space so that the support may contact the washer on initiation of retraction of the rod into the cylinder causing the washer to cant, arrest the piston rod, and hold the door open. To unlatch the door, the positionable support is withdrawn to avoid canting contact with the washer. Several embodiments of the invention vary the elements of the positionable support.

Claims13

Dependent claims

A door closer comprising:

(a) a cylinder having a free end and an attachable end attachable to a door or door frame;
(b) a piston rod having a piston end retaining a piston and an attachable end attachable to a door frame or door, said piston rod and said piston being contained in said cylinder with said attachable end of said piston rod extending out of said cylinder free end and slidably displaceable within said cylinder from a maximum retracted position in said cylinder to a maximum extended position;
(c) piston urging means within said cylinder urging said piston to the maximum retracted position, said urging means being placed within said cylinder, in between said free end of said cylinder and said piston and pushing, directly or through means, against said piston;
(d) an end cap fixed on said cylinder proximate said free end of said cylinder, said end cap having a passage for said piston rod;
(e) an intermediate support fixed in said cylinder longitudinally spaced from said end cap in between said end cap and said piston urging means, said intermediate support having a passage for said piston rod;
and
(f) latching means, a portion thereof within said cylinder between said end cap and said intermediate support, and another portion thereof extending through an aperture in said cylinder.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/547,921Filed 25 Oct 1995
Granted: 20 May 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

E05C 17/30
With a movable bar or equivalent member extending between frame and wing: of extensible, e.g. telescopic, construction
E05F 3/108
With a spring, other than a torsion spring, and a piston, the axes of which are the same or lie in the same direction: with piston rod protruding…
E05F 3/221
Additional arrangements for closers, e.g. for holding the wing in opened or other position: mechanical power-locks, e.g. for holding the wing open…
E05Y 2900/132
Type of wing: doors