Door closer for the non-fire side of a fire-door safety installation
AssigneeSchlage Lock Company LLC
InventorsRex H. Lasson, William L. Downey, Roderick A. L. Ross
Life of this patent
Estimating the term…
Abstract
A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and attached to a non-fire side of the fire-door by at least one fastener; a door control arm pivotally connected to the door frame at a first end and to the door closer assembly at a second end; and the hydraulic damping fluid is one of a group of fire resistant hydraulic fluids.
Claims12
A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation, comprising:
- a door closer assembly filled with a hydraulic damping fluid and attached to said non-fire side of said fire-door by at least one fastener;
- a door control arm pivotally connected to said door frame at a first end and to said door closer assembly at a second end;
- and
- said at least one fastener being made from a material which has a melting point lower than an auto-ignition temperature for said hydraulic damping fluid.
A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation, comprising:
- a door closer assembly filled with a hydraulic damping fluid and attached to said non-fire side of said fire-door by at least one fastener;
- a door control arm pivotally connected to said door frame at a first end and to said door closer assembly at a second end;
- and
- means, in said door closer assembly, for providing pressure compensation such that, when heated by contact of the door closer with the fire door, the hydraulic damping fluid occupies a low pressure volume inside said door closer and relieves thermal expansion pressure therein.
A door control device for use on a non-fire side of a fire door mounted in a fire-door frame in a fire-door safety installation, comprising:
- a door closer assembly attached to said non-fire side of said fire by at least one fastener and filled with a hydraulic damping fluid, said hydraulic damping fluid having a thermal expansion characteristic which causes a pressure increase in said door closer upon heating thereof;
- a door arm pivotally connected to said door frame at a first end and to said door closer assembly at a second end;
- and
- a pressure compensation mean for limiting fluid pressure in said door closer assembly when said door closer is completely filled with a hydraulic fluid at room temperature and heated.
A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation, comprising:
- a door closer assembly filled with a hydraulic damping fluid and attached to said non-fire side of said fire-door by at least one fastener;
- a door control arm pivotally connected to said door frame at a first end and to said door closer assembly at a second end;
- and
- means for thermally insulating said door closer assembly to inhibit heat transfer from said fire door to said door closer assembly.
Dependencies are inferred from the claim text.