Abstract: A volume air flow controller having a butterfly damper mounted within an air duct and movable between open and closed positions employs a baffle, located upstream from the damper, as an air flow impedance to change the flow conditions upstream from the damper so as to reduce the normal damper closing torque resulting from aerodynamic forces produced by air flow past the damper.

Abstract: An air induction unit having a first induction means to induce secondary air through a first induction opening into a stream of primary air to produce an air stream of mixed primary and secondary air, and a second induction means to induce additional secondary air into the mixed air stream through a second induction opening.

Abstract: A controller for at least one damper maintains a constant volume rate of flow of air through a duct into a controlled space for a given condition in the controlled space. The dual reset controller resets the volume rate of flow as functions of two sensed conditions.

Abstract: A tramming fixture and method for accurately tramming in, or positioning, a dressing wheel with respect to a dressing axis of a dressing machine so that all points on the surface of the dressing wheel which contact the workpiece during dressing are equi-distant from such dressing machine axis. In accordance with this invention, the tramming fixture provides a mechanism for obtaining a measurement representative of the distance between a reference line and the point of dressing contact on the peripheral surface of the dressing wheel. By tilting or rotating the dressing wheel about the dressing axis through predetermined angles, taking corresponding distance measurements, and comparing the measurements, a determination can be made of the appropriate position adjustment required to properly locate the dressing wheel.

Abstract: A method and apparatus for accurately producing relieved cutting tools and other relieved shapes by electrical erosion, whereby the workpiece is maintained in a horizontal position and a wire electrode is tilted at the desired relief angle from vertical after which they are moved relative to each other in a manner such that the spacing between them in a horizontal plane is compensated for the elliptical cross-section of the working gap in the horizontal plane.

Abstract: A heat pipe heat exchanger has a plurality of heat pipes which are interconnected so as to permit fluid communication between the pipes at least during charging so that the heat pipes may be simultaneously filled with heat transfer fluid.

Abstract: A cutter blade for use in cutting metal is formed with a recess spaced behind the cutting edge on the cutting face to save expensive cutting material, to reduce the time and energy required to sharpen the cutter blade, and to lengthen the life of the sharpening tool. High density sintered powdered tool steel lends itself well to this construction, as do cast and forged tool steels.

Abstract: A tramming fixture and method for accurately tramming in, or positioning, a dressing wheel with respect to a dressing axis of a dressing machine so that all points on the surface of the dressing wheel which contact the workpiece during dressing are equi-distant from such dressing machine axis. In accordance with this invention, the tramming fixture provides a mechanism for obtaining a measurement representative of the distance between a reference line and the point of dressing contact on the peripheral surface of the dressing wheel. By tilting or rotating the dressing wheel about the dressing axis through predetermined angles, taking corresponding distance measurements, and comparing the measurements, a determination can be made of the appropriate position adjustment required to properly locate the dressing wheel.

Abstract: A heddle for a weaving machine for making triaxial fabrics has a nose portion with a rounded free end of substantially the same thickness as a major portion of the heddle. The nose postion is also provided with a warp strand guide opening therethrough and reduced thickness portions between the opening and the edges of the nose portion to minimize warp strand abrasion during weaving.

Abstract: A reed opener assembly for spreading the dents of a reed to permit entry of a needle therebetween during a warp drawing operation has a reed opener blade, a reed opener body and means to retain the reed opener blade and reed opener body in cooperative relationship such that the blade and body combine to form a cam surface for successively engaging and spreading adjacent dents of a reed.

Abstract: Upon sensing an excessive temperature in a plenum supplying secondary air to a mixing box, a thermostatic element opens a valve to exhaust air from a pneumatic actuator for opening a normally closed secondary air damper. This action permits the damper to close and so prevent flow of secondary air from the plenum into the mixing box. The control may be tested by applying auxiliary heat to the thermostatic element. The control may be made to prevent spread of smoke by making the application of heat to the thermostatic element responsive to a smoke detector.

Abstract: A heat pipe heat exchanger has a plurality of heat pipes which are interconnected so as to permit fluid communication between the pipes at least during charging so that the heat pipes may be simultaneously filled with heat transfer fluid.

Abstract: A fixed cam located between a circular yarn guide and a continuous line of yarn separators moving around a substantially linear closed path is shaped to maintain substantially constant the length of warp strands moved laterally between the circular yarn guide and any of the yarn separators.

Abstract: A device for automatically lifting a yarn package off of a package drive roll in response to a detected condition has a vertical member depending from a package support and extending through an opening in a lever assembly. The lever assembly is selectively raised by operating means in response to a detected condition and engages the vertical member at the opening by means of the frictional force resulting from a binding action caused by rotation of a portion of the lever assembly with respect to the vertical member. In addition, the lever assembly is biased such that it is disengaged from the vertical member when the downward pressure exerted by the package and package support is relaxed.

Abstract: A control for an induction air mixing box for mixing conditioned primary air and induced secondary air for delivery at a substantially constant volume rate of flow into a condition controlled space, the volume rate of flow of primary air being maintained constant at a predetermined rate, said predetermined rate being resettable as a function of the sensed condition in the space. The induced rate of flow of secondary air is restricted as another function of the sensed condition, the change in rate of flow of the secondary air being inverse to that of the primary air.

Abstract: A signal monitoring device useful to monitor power consumption level employs a phase locked loop and an associated frequency reduction circuit to convert relatively low frequency input pulse signals to an output signal representative of power consumption.

Abstract: In a triaxial weaving machine, a finger engages the weft as it leaves the shed and moves the weft toward the fell to assure that the dents of two reeds, alternately insertable across the shed, will penetrate the shed above the newly inserted weft.

Abstract: A gear shaper cutter for generating rough shapes has an undulating cutting edge profile to leave alternating heavy and light sections of material to be removed from the rough shape in a finishing operation. Chips are, as a result, more easily broken during the subsequent finishing operation to provide better heat dissipation and longer finishing tool life.

Abstract: Friction devices are provided for a conical package core in positions near the large end of the core and intermediate the ends of the core. A creeling tail is wound on the large end of the core while the drive near that end is effective to rotate the core. When the strand being wound is transferred to a traversing strand guide, the strand is moved to and fro along the rotating core to produce a helical winding of the strand over the core between the small end and the creeling tail. The strand coming between the core and the intermediate drive lifts the core out of engagement with the drive at the large end.

Abstract: High-speed tool steel cutting blades are inserted in slots in an inexpensive core and retained therein by a high-strength structural anaerobic adhesive. These adhesives are liquids before curing.