US 4,048,694 AGranted

Hydraulic door closer with adjustable time delay dampener

AssigneeOgden Industries Pty. Ltd.

InventorsDonald John Newman, Gerald Francis Dunphy

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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.

Claims14

Dependent claims

A door closer including;

a hollow body;
a body piston slidably mounted in said body and dividing the interior thereof into a damping chamber and a reservoir chamber, the respective volumes of which vary with axial movement of said body piston relative to said body;
first biasing means urging said body piston in a direction to reduce the volume of said damping chamber;
escape means through which fluid can be bled from said damping chamber to permit said body piston to move in said direction, including an escape conduit and a compartment having an inlet which communicates with said damping chamber through said escape conduit so as to receive said fluid therefrom, at least in some positions of said body piston relative to said damping chamber, and an escape port through which said fluid received from said damping chamber can be discharged;
closure means controlling opening and closing of said escape port and being mounted within said compartment for movement between a rest position and an escape port opening position, said positions being spaced apart and said escape port being maintained closd while said closure means travels between said positions;
and second biasing means urging said closure means into said rest position;
said closure means being responsive to the pressure of fluid received through said inlet to move towards said escape port opening position against said second biasing means, when said pressure exceeds the influence of said second biasing means on said closure means;
whereby a time delay occurs in the opening of said escape port while said closure means moves between said rest position and said escape port opening position.

5 more elements

A door closer including;

a hollow body;
a body piston slidably mounted in said body and dividing the interior thereof into a damping chamber and a reservoir chamber, the respective volumes of which vary with axial movement of said body piston relative to said body;
first biasing means urging said body piston in a direction to reduce the volume of said damping chamber;
escape means through which fluid can be bled from said damping chamber to permit said body piston to move in said direction, including an escape conduit and a compartment having an inlet which communicates with said damping chamber through said escape conduit so as to receive said fluid therefrom, at least in some positions of said body piston relative to said damping chamber, and an escape port through which said fluid received from said damping chamber can be discharged;
closure means mounted within said compartment for movement between a rest position and an escape port opening position, and urged by a second biasing means into said rest position to thereby block fluid communication between said inlet and said escape port;
said closure means being responsive to the fluid pressure within said damping chamber, which is communicated to it by said escape conduit and said inlet, to move against the influence of said second biasing means in a direction toward said escape port so as to adopt said escape port opening position;
said escape port being maintained closed while said closure means travel between said positions, and said escape port being at least partially opened at said escape port opening position to permit fluid communication between said inlet and said escape port;
the time taken by said closure means to move the distance from said rest position to said escape port opening position being determined relative to the rate of flow of fluid through said inlet to thereby achieve a desired time delay between the pressurization of fluid within said damping chamber by action of said piston means and the arrival of said closure means at said escape port opening position.

5 more elements

A door closer including;

a hollow body;
a body piston slidably mounted in said body and dividing the interior thereof into a damping chamber and a reservoir chamber, the respective volumes of which vary with axial movement of said body piston relative to said body;
first biasing means urging said body piston in a direction to reduce the volume of said damping chamber;
escape means through which fluid can be bled from said damping chamber to permit said body piston member to move in said direction, including an escape conduit and a compartment having an inlet which communicates with said damping chamber through said escape conduit so as to receive said fluid therefrom, at least in some positions of said body piston member relative to said damping chamber, and an escape port through which said fluid received from said damping chamber can be discharged;
closure means mounted within said compartment for movement between a rest position and an escape port opening position, and urged by a second biasing means into said rest position to thereby block fluid communication between said inlet and said escape port;
said closure means being responsive to the fluid pressure within said damping chamber, which is communicated to it by said escape conduit and said inlet, to move against the influence of said second biasing means in a direction toward said escape port so as to adopt said escape port opening position;
said escape port being maintained closed while said closure means travel between said positions, and said escape port being at least partially opened at said escape port opening position to permit fluid communication between said inlet and said escape port;
the time taken by said closure means to move the distance from said rest position to said escape port opening position being determined relative to the rate of flow of fluid through said escape port to thereby achieve a desired time delay between the pressurization of fluid within said damping chamber by action of said piston means and the arrival of said closure means at said escape port opening position.

5 more elements

Dependencies are inferred from the claim text.