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.

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.

Abstract: A disc brake assembly for use in a vehicle having an axle rotatably journaled in an axle housing wherein a rotatable brake disc is connected to a rim support for rotation along with a tire of the vehicle. A housing is attached to said axle housing and encompasses the brake disc. Such housing has a caliper member which straddles a portion of the outer periphery of the brake disc having piston means moveable into engagement with the brake disc. Coolant means are provided to said housing for directing a flow of coolant into said closed chamber for direction against the brake disc, which is then removed via an exhaust opening to atmosphere.