Abstract: A drive system for rotating rollers advancing a board through a board cutting machine. Sprockets and chains in the drive system are positioned such that adjustment of a set of rollers on one side of the board to accommodate varying board thicknesses will not require adjustment of a tension sprocket manually or by a spring.

Abstract: An improved tool holder for a fiber board cutting machine wherein the cutting machine includes at least one tool holder bar disposed transverse to the direction of feed of the board. The improved tool holder comprises a first member having a bottom and at least one upstanding wall, the upstanding wall terminates in an outwardly turned flange that is received on the tool holder bar. The first member has at least one downwardly disposed bracket for receiving an adjustment mechanism. A blade assembly is removably attached to the adjustment mechanism; the blade assembly may be adjustably moved in a transverse direction to the feed direction of the board. At least one non-rotating blade is mounted on the attachment member.

Abstract: 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 between the two sides of the housing, and one end of the first damper blade is coupled to a damper gear. The second damper blade is also rotatably supported between two sides of the housing adjacent the first damper blade, and one end of the second damper blade is coupled to another damper gear. The system further includes a support disposed on the side of the housing with the damper gears; a rack, having a plurality of teeth engaging the damper gears, movably disposed in the support; and a drive means for moving the rack along the support.

Abstract: 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 between the two sides of the housing, and one end of the first damper blade is coupled to a damper gear. The second damper blade is also rotatably supported between two sides of the housing adjacent the first damper blade, and one end of the second damper blade is coupled to another damper gear. The system further includes a support disposed on the side of the housing with the damper gears; a rack, having a plurality of teeth engaging the damper gears, movably disposed in the support; and a drive means for moving the rack along the support.

Abstract: 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 between the two sides of the housing, and one end of the first damper blade is coupled to a damper gear. The second damper blade is also rotatably supported between two sides of the housing adjacent the first damper blade, and one end of the second damper blade is coupled to another damper gear. The system further includes a support disposed on the side of the housing with the damper gears; a rack, having a plurality of teeth engaging the damper gears, movably disposed in the support; and a drive means for moving the rack along the support.

Abstract: Air handling system including a heat recovery means including blowers and dampers for controlling air flow and a desiccant wheel movable into and out of the air stream to selectively recover heat from exhaust air and transfer it to outside air. The air handlling system may also include an air conditioning system and an economizer inclulding dampers to control recirculated air and inlet and exhaust air.

Abstract: A simplified plastic window framing system for single or multiple glazing comprising combinations of complementary extrusions wherein the outward appearance of the finished mullions and peripheral framing appears to be that of single extrusions. In outward appearance the glazing is retained within recesses formed in the mullions or frame members and separable retaining members. The combination creates a substantially rectangular external appearance to the individual mullions and framing members.The framing members are roughly L-shaped and the mullions are roughly T-shaped in cross section. The retaining members are substantially rectangular or trapezoidal in cross section. As finished units however, the mullions and framing members are both substantially rectangular in cross section with only the co-extruded glass seals slightly protruding from the mullions or framing members.