Abstract: 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 therealong can easily be cut and assembled at the job site to custom fit and install a damper in a duct, opening, or plenum.

Abstract: For a single blade damper, an improved damper operator including a bimetallic element, one end of which is attached to the frame of the damper, and the other end of which is pivotally associated with a bracket connected to the damper blade.

Abstract: For a damper, an improved damper operator including a bimetallic element connected at one end to the frame of the damper, and at the other end to a pivotal linkage which is also pivotally connected to the blade or blades of the damper.

Abstract: 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 capable of being fitted onto or into one of the ducts in said system so that said blade pivots between fully open and closed positions. Associated with the blade is an adjustment device adapted to permit the blade to be easily rotated and locked in an intermediate position whereby said balance is achieved.

Abstract: 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 being in the form of a link bar which adapts all of said blades to open and close as a unit. The operator comprises a pair of pivotally connected members to form a knee-action joint which in turn is pivotally connected both to the damper frame and to said link bar. The operator also comprises stall type actuation means for selectively acting through the operator to control the degree of blade opening and bias means to return said blades to their normal operating position whenever said actuation means is disengaged.

Abstract: The present invention relates to slip joints for use with dampers, ducts, and mounting surfaces, as for example, fire dampers which are to be mounted through walls or other fire proof partitions and which are to have ducts mounted thereto. A novel duct-damper interface adaptor is disclosed which is constructed entirely from integral sheet material and which is slipped onto the inwardly depending flanges of a damper during the assembly of that damper. The damper adaptor unit is then ready to receive a complementally formed duct which is slidingly fitted thereon. This embodiment provides adaptors which are inexpensive, easy to manufacture, readily installable at the job site and provide superior advantage to the final damper-duct installation.

Abstract: A novel operator for use with a damper is disclosed comprising a plurality of pivotally interconnected damper operator members which are pivotally associated with the damper blade linkage and frame, such that they may be moved to an over-center locking position to lock the damper blades in their desired fire actuated positions. The operator also comprises an actuator means for selectively acting through the operator to control the degree of blade opening, and a releasing device for responding to various activation conditions, such as heat, for disengaging the actuator from the operator members to facilitate closure and automatic locking of the blades. The operator members may also be springed biased to automatically accomplish blade closure.

Abstract: A novel operator is disclosed for use in combination with a butterfly fire and volume control damper, which operator may be concealed behind a standard concentric diffuser. Only a screwdriver aperture need be provided in the diffuser to facilitate the volume adjustment of the butterfly damper. In response to excessive heat in the vicinity of the damper, the blades of the damper will move to their fully closed position. Once activation conditions have passed, the damper may be reset by replacing the releasing device which separated in response to said heat.

Abstract: A releasable link is mounted on the wall of a duct, plenum, chamber or the like. The link releases in response to a predetermined increase of temperature within the duct. The link is resettable without having to gain access to the interior of the duct. In addition, the link can be released manually or remotely from the outside. In another embodiment, in addition to being resettable as well as manually and/or remotely releasable from the outside, the link is releasable in response to a predetermined temperature increase occurring either within or outside of the duct.

Abstract: 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 therealong can easily be cut and assembled at the job site to custom fit and install a damper in a duct, opening, or plenum.

Abstract: A novel operator is disclosed for use in combination with a butterfly fire and volume control damper, which operator may be concealed behind a standard concentric diffuser. Only a screwdriver aperture need be provided in the diffuser to facilitate volume adjustment or resetting of the bufferfly damper. In response to excessive heat in the vicinity of the damper, or alternatively, in response to a remote signal received by the operator, the blades of the damper will move to their fully closed position. Once activation conditions have passed, a screwdriver is used to reset the damper to resume its volume control function.

Abstract: A pair of butterfly smoke/fire dampers are mounted on a single frame. Each damper includes a pair of blades which can be locked in the open position and which, when released, rotate about a hinge to the closed position. The frame has a flange around the inner periphery thereof which engages the edges of the blades in the closed position. Each pair of blades are moved to the open position by an operator cable which extends through a first ferrule in the frame, through a second ferrule in one of the blades and thereafter across the blades to a point of attachment complementally located on the opposing blade. The frame ferrule is offset from the blade ferrule whereby withdrawing the cable causes both blades to be drawn toward each other. The blades can be held in the open position by maintaining tension on the operator cable or by a fusible link or other heat responsive latching mechanisms.

Abstract: A novel locking clip is disclosed for use with either fire or smoke dampers, which locking clip normally does not interfere with the operation of those dampers but, which under activation conditions, allows the blades of the damper to move into the desired position, but effectively prevents the blades from moving out of that position until fire conditions have passed.

Abstract: A novel press brake is disclosed which incorporates a double lever actuating mechanism which is easily adjustable to vary the stroke of the press brake as well as adjusted to counteract the rotational forces imparted to the ram by reason of differential resistances created by the workpiece during the forming operation.

Abstract: A 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 configured hook-shaped hinge elements formed on opposite sides of the damper frame. A novel notch configuration is made in an inwardly depending flange in the frame on opposite sides, the hinge elements being made from at least a portion of the material notched from the frame. In the closed position, various blade portions engage opposite sides of the inwardly depending flange in the frame to form a seal therebetween, thereby providing a positive pressure resistant seal. The seal is made more complete along the flange in the area of the hinge element because of the novel notch configuration.Several embodiments of actuating the blades to move them between open and closed positions are disclosed. In one such embodiment, a link passes through an arcuate opening in the wall of the frame to engage a linkage rod.

Abstract: A novel telescoping heat responsive releasing device is described wherein a mounting member on which a bimetallic means is mounted slidingly engages a pawl member which is movable between a first position in which the pawl member is capable of being restrained by the aforementioned bimetallic means, and an actuating position wherein associated apparatus connected to said releasing device may assume the desired heat responsive posture. Various alternate embodiments are illustrated wherein a plurality of bimetallic elements are utilized to engage the pawl member, wherein a bimetallic element is additionally actuated mechanically or electrically, and wherein various pawl and mounting member configurations are illustrated.

Abstract: A fluid piston actuated press is provided with a fixed portion, such as a die, and a plurality of movable portions, such as punches, which move reciprocally along paths which intersect the fixed portion. A plurality of levers, actuated by an actuating means, engage the movable portions to cause them to move along their paths intersecting the fixed portion.

Abstract: A novel telescoping heat responsive releasing device is described wherein a mounting member on which a bimetallic means is mounted slidingly engages a pawl member which is movable between a first position in which the pawl member is capable of being restained by the aforementioned bimetallic means, and an actuating position wherein associated apparatus connected to said releasing device may assume the desired heat responsive posture. Various alternate embodiments are illustrated wherein a plurality of bimetallic elements are utilized to engage the pawl member, wherein a bimetallic element is additionally actuated mechanically or electrically, and wherein various pawl and mounting member configurations are illustrated.

Abstract: A novel telescoping heat responsive releasing device is described wherein a mounting member on which heat responsive and locking means are mounted slidingly enages a pawl member which is movable between a first position in which the pawl member is capable of being restrained by the aforementioned latching means, and an activated position wherein associated apparatus connected to said releasing device may assume the desired heat responsive posture. In the preferred embodiment, a biasing means is provided for biasing said mounting member and said pawl member from said activated position towards said first or normal position. Various alternate embodiments are illustrated showing various attachment sliding and mounting configurations.

Abstract: 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 opposing inwardly depending flanges of the damper frame. The flanges are additionally notched so that hook-shaped ends on the damper blades are capable of creating seals with their adjacent blades across their entire lengths, while top and bottom inwardly depending flanges are offset with respect to the plane of the blades to create seals with the offset tips of the end most blades of the damper when those blades are in the closed position. Finally, at one end of the blades a rectangular notch is formed which, upon rotation of the blade, interfers with a linkage rod disposed adjacent to the frame side wall to define a "full open" position.