Matches 1 - 50 out of 71 1 2 >
Match Document Document Title
7198062 Fluid control valve  
A valve is provided for controlling a flow of a fluid between a first environment and a second environment. The valve includes a frame adapted to fit within a perimeter of an aperture in a divider...
6817378 Fluid flow control damper assembly  
A fluid flow control damper assembly having a damper vane and a piston actuator is relatively easy to install when the outer surface of a duct is inaccessible. The piston actuator includes a powder...
6557583 Electric power modulated lead screw actuated dampers and methods of modulating their operation  
A damper assembly in which the position of the damper blades is controlled by an electric powered actuator. The powered actuator rotates a threaded lead screw shaft attached to an operator means...
6499310 Flow control device for a gas stream  
An airflow control device for air streams in a motor vehicle air-conditioning system includes an installation frame with pivotable lamellae ( 2 ) that are driven by an electric motor via a gear...
6418964 Bearing-supported damper assembly  
A damper system has a frame within which a plurality of pivotally supported vanes are actuated by linkage rods pivotally connected to the vanes by rocker brackets and trunion pivots. The trunion...
6293306 Throttle gate valve  
A throttle gate valve (10) including an upright, generally rectangular valve housing (12), in which is positioned a linearly movable gate valve (32) for closing off a thru-opening (15) formed in...
6099405 Damper blade system  
A damper blade system for positioning proximate a duct includes a housing with two, opposing sides; a first damper blade; and a second damper blade. The first damper blade is rotatably supported...
5938524 Damper blade system  
A damper blade system for positioning proximate a duct includes a housing with two, opposing sides; a first damper blade; and a second damper blade. The first damper blade is rotatably supported...
5580307 Shutter for air or smoke conduits  
The air lock includes a frame, a passage port defined by the frame, a plurality of side by side tabs supported in a rotating manner by the frame and extending through the passage port as well as...
5425673 Fire closure shutter  
A fire shutter comprises a plurality of substantially planar fire plate elements each having first and second opposite edges and supported so that they are adjacent to each other and turnable about...
5238453 Integral pivot damper blade  
A damper blade is constructed with a laterally extending, rounded rib and with integral journals on opposite ends of the rib that form bearing surfaces when the blade is journaled in openings in...
5141026 Pivoting shutter device for regulating an air flow passing through a heat exchanger  
A device for regulating the flow of air through a heat exchanger has a multiplicity of shutters pivotally mounted on parallel axes and actuated by control means that include an actuating plate...
5103867 Active reed valve  
An active reed valve for a fluid passage comprising a sealing means sealingly fixed to the passage walls, and a primary petal seat having a primary seat port and a downstream primary seat end. A...
5007456 Closing arrangement for ducts having large cross-sectional areas, particularly flue gas ducts  
A closing arrangement for ducts having large cross-sectional areas, particularly flue gas ducts for power plants. The arrangement includes at least two flaps which are mounted on at least one flap...
4887641 Modified parallel blade damper for an air handling system  
A multiple blade damper for an air handling system of the type in which at least an adjacent pair of blades of the damper are operated in parallel, that is, in which each of such pair of blades is...
4823836 Dampers with leaf spring seals  
A leaf spring seal to effect sealing contact between such members as a damper blade and a frame consists of a set of leaf springs having their inner portions held together by clamping components of...
4610197 Damper blade construction  
A hollow airfoil damper blade formed by sheet metal. The walls of the blade are formed by two sheets crimped together at the edges. The blade tapers from the center toward the edges and has two...
4518012 Air damper assembly with movable blades  
An air damper assembly has a frame which is mounted on the walls of an air flow passageway, with flanges extending inwardly from at least one pair of opposed sides of the frame. A plurality of...
4506829 Variable speed damper means  
Automatic damper means having damper blades rotatably mounted in an adjustable housing, said blades being rotatable between open and closed positions by electrically energized motor means and...
4506825 Solenoid operated damper blades  
Solenoid motor means for operating a multiple blade damper device; said blades being pivotally mounted in a common housing; said housing being constructed to reside in an open ended duct boot that...
4493342 Double louver damper  
A double louver damper for use in a duct system conveying hot gases and particles in order to permit safe entry to be made therein when servicing is required has a frame to be incorporated in the...
4487214 Damper blade actuating mechanism  
Damper blade actuator assembly for use in association with a damper having damper frame means adapted to be associated with an air duct system, and defining an air flow opening, and movable damper...
4442862 Link bar operator for rotating blade dampers  
An operator for rotating blade dampers including a frame and a plurality of interconnected blades adapted for rotation within the frame, which operator comprises a pair of pivotally interconnected...
RE31471 Multiple blade damper assembly  
A damper assembly including a plurality of damper blades pivotable about parallel axes. Each blade includes a pair of parallel plates spaced apart by supporting members, the plates providing an...
4404990 Economy, angle-blade damper kit  
A novel damper kit is described wherein blade stock having a hook-shaped hinge portion formed therein, and notched angle bracket stock having periodically spaced hook-shaped hinge elements formed...
4377350 Pivot for damper assembly  
A cylindrical pivot for a multiblade damper assembly having at least three pivotally mounted blades is provided in which the blades are interlinked by connecting rods pivoted to brackets which are...
4375183 Insulated shutter assembly  
An insulated shutter assembly is installed in a ceiling or other wall of a building and used in combination with a ventilating fan for intake or exhaust, such as a whole house fan. The shutter...
4372342 Balancing damper with quick set adjustment bracket  
A damper for adjusting and balancing the air flow rates in air conditioning and similar large gas flow systems is disclosed which comprises at least one pivotable blade located in a frame which is...
4338967 Universal link bar operator and actuator for rotating blade air, smoke, and fire dampers  
A universal operator is disclosed for rotating blade air, smoke and fire dampers, said dampers comprising a frame and a plurality of interconnected blades within said frame, said interconnection...
4305427 Damper assembly  
A multiblade damper assembly having at least three pivotally mounted blades is provided with means to interlink these blades in which a bracket is secured to each of the blades with each bracket...
4294283 Wedge sealed damper  
A damper assembly comprising, in combination, a generally rectangular frame including side, top and bottom members, a plurality of damper blades supported at opposite ends on the side members of...
4274439 Control valve having a disc shaped throttle  
The invention relates to a throttling valve with low noise. The passage of fluid is controlled by an aperture between parallel discs, which can be turned around special axes for altering the...
4273156 Shutoff device  
The shutoff device for closing a large cross-sectional area gas duct comprises a lock chamber defined by the gas duct walls and the two rows of swivel louvre grills held to the housing of the...
4259987 Linear damper system  
The damper system for controlling the flow of a gaseous fluid in a duct member is disclosed in which the combination of parallel and opposed flow characteristics is utilized to produce a composite...
4256143 Shut-off damper  
A shut-off damper comprising a line of blades which are supported in a surrounding frame for rotary motion about substantially parallel axes to open or close an opening in the frame, and springy...
4254795 Airflow control mechanism insertable into an air duct  
The invention provides an air flow control mechanism adapted to be slideably insertable into an air duct without substantial structural modification of the air duct and without requiring shut down...
4253492 System for controlling the flow of gaseous fluids  
A duct, presumably that of a utility boiler or the like, has a frame mounted on its internal walls. Parallel louver blades are mounted in the frame and linked for simultaneous actuation to move the...
4249571 Air control mechanism having noise suppression means  
The invention provides an airflow control mechanism for use in an air duct for controlling airflow through the duct. The air flow control mechanism includes a frame positionable in the duct, and a...
4244397 Shut-off damper  
A shut-off damper having blades of a generally streamlined shape with the trailing edges of the blades comprising fluid sealing means extending along those edges so that a seal is formed between...
4191212 Multiple blade damper assembly  
A damper assembly including a plurality of damper blades pivotable about parallel axes. Each blade includes a pair of parallel plates spaced apart by supporting members, the plates providing an...
4187878 Valve having internally pressurized sealing elements  
Disclosed is a valve especially adapted for the control of gases in large cross sectional ducts, flues, chimneys and the like. The valve comprises a plurality of elongated, vane-like closures...
RE30204 Control damper  
A control damper is mounted in a building duct system for closing a control opening through a housing or frame and includes a linkage connected to the housing and to a vane positioned in the...
4185658 Rotating blade damper  
A novel rotating blade fire, smoke and air control damper is disclosed wherein integral hook-shaped hinge portions of the damper blades cooperate with integral hook-shaped hinge elements on...
4185657 Economy, angle-blade damper kit  
A novel damper kit is described wherein blade stock having a hook-shaped hinge portion formed therein, and notched angle bracket stock having periodically spaced hook-shaped hinge elements formed...
4184288 Smoke and fire shield damper  
A combination smoke and fire shield damper comprising a line of blades each of which is so supported for rotation in a surrounding frame that the blades are swingable about parallel axes to open or...
4114646 Rotating blade fire damper  
A novel fire, smoke and air control damper is disclosed wherein one or more hook-shaped hinge portions formed intermediate between the longitudinal edges of each damper blade engage complementally...
4113232 Smoke, fire and air control damper with stamped blade  
A novel smoke, fire or air control damper is disclosed wherein a frame with an inwardly depending flange is articulated to at least one rotating blade by integrally formed hook-shaped hinge...
4103601 Air grille components and air grille therefrom  
A group of novel components for use in a composite air grille including an air director blade assembly having parallel blades and blade supporting bars at each end, and including a novel form of...
4095534 Damper with curved extension plates for wide range flow control  
A damper for fluid flow control has a curved extension plate positioned with respect to the circular path defined by the end of a pivotal damper blade to provide close control of the effective open...
4077432 Purged valve  
A valve assembly having a frame with a fluid flow opening therethrough; at least one blade mounted in the frame opening to be movable from a valve open position, in which fluid is able to flow...
Matches 1 - 50 out of 71 1 2 >