Abstract: An optical fibre cable switch is provided in which opposed cable end faces are precisely aligned coaxially while permitting standard optical fibre cable bushings to be used. An alignment member is first positioned within the central opening of the bushings. The aligned bushings are then cemented or glued to the switch housing while being held in alignment by the alignment member. The alignment member is then removed so that standard cable terminating ferrules may be inserted into the aligned bushings.

Abstract: A quiet by-pass vacuum motor wherein a ring-like cavity is defined between inner and outer walls of the housing for a working air fan. Separating members divide the cavity into passageways which communicate with openings in the housing. A plate having a plurality of vanes thereon is received upon the separating members, the plate extending from the outer wall to a position short of the inner wall. A baffle plate is then received upon the vanes. Working air is exhausted over the baffle plate, between the vanes, over the plate and between the separating members and through the openings. The exhaust path greatly reduces the noise level of the vacuum motor.

Abstract: Improved fabrics are produced by weaving and using relatively uniform elongated hollow monofilament bristles which partially collapse during weaving to form a partially flattened fabric without twists and bends and which has a superior weight/strength ratio in comparison with conventional fabrics.

Abstract: A flow inducer apparatus for positioning in a duct containing a flowing stream for continuously and rapidly receiving a sample of gas from and returning said sample to the flowing stream in said duct. Said apparatus comprises inlet opening means extending around an entire outer circumference of said apparatus to receive the sample of said flowing stream regardless of the rotational disposition of said apparatus in the duct. Said apparatus also comprises an integral discharge aspirator means. The discharge aspirator means is open to the surrounding duct along an entire outer circumference of said apparatus for receiving a portion of said flowing stream regardless of the rotational disposition of said apparatus in the duct. The discharge aspirator means is adapted so that the movement of the stream flowing in the duct tends to draw the sample through the apparatus and thereby provide the energy for operation of the flow inducer.

Abstract: A plurality of blades extend radially from a hub which is rotated by a motor about a drive axis. Each blade has a root which is rotatably connected to the hub so that it can be independently twisted to vary the pitch thereof relative to the drive axis. A plurality of electromagnets are annularly positioned adjacent the hub so that permanent magnets connected to the roots of corresponding blades can be attracted and/or repelled to induce twisting motion in the blades as the hub rotates about its drive axis. A control circuit receives input commands for a manual control device and causes predetermined electrical signals to be applied to the electromagnets for simultaneously varying the pitch of the blades. The pitch of the blades can be varied cyclically and collectively in accordance with any real continuous function, and not just sinusoidally as in the case of prior mechanical linkages employing swash plates.

Abstract: A plurality of piezoelectric or magnetostrictive rectangular planar staves are held in side-by-side relation in a laminate assembly including insulative spacers. The widthwise polarity of adjacent pairs of the staves are inverted relative to each other. The acoustic centers of the staves are spaced apart a distance of approximately one-half of a wavelength of the operating frequency. Electrical connections are made to the opposite side edges of each of the staves through leads and bus wires. The array of staves define an active planar acoustic face for simultaneously sending and simultaneously receiving a pair of angularly separated beams of acoustic energy without electronically phasing or time delaying the signals transmitted to and from the individual staves and without mechanically rotating the array.

Abstract: A fluid flowmeter is disclosed herein which includes a fluid displacement member positioned in the fluid flow to substantially linearize the velocity profile associated therewith. In one form of the invention the pressure differential in the fluid existing across the fluid displacement member is advantageously exploited, and several embodiments thereof are disclosed. In another form of the invention the fluid displacement member is utilized to produce trailing vortices.

Abstract: A magnetic flux shield and enhancer for brushless motors, with a plurality of clips having orthogonal legs in flux-conducting relationship to the rotor and permanent magnets of the motor. The permanent magnets are affixed to an inner circumferential surface of the rotor. Each of the clips receives a Hall sensor for activation by the magnets as they pass by. A first leg of the clip is configured so as to concentrate the flux from the magnets to an associated Hall sensor, while shielding the Hall sensor from flux emanating from the stator assembly of the motor. A second leg of the clip, connected to the first leg, provides a path for the flux through the rotor for return to the magnet from which it originated.

Abstract: A backwound pre-stressed flat spring motor and method of making the same having a pre-stressed spring element backwound on a central arbor within a cup wherein a portion of the spring element extends beyond the arbor wherein the initial turns of spring element backwound on the central arbor comprise alternating layers of the extended portion of the spring and the spring element resulting in increased initial torque when compared to a conventional backwound pre-stressed spring motor having the same construction otherwise.

Abstract: A by-pass vacuum motor assembly wherein the motor cooling fan is positioned in an opening at the bottom of the motor band and immediately above a flat plate portion of the fan housing bracket. The flat plate portion functions as a plate diffuser, redirecting air drawn through the commutator end bracket and across the motor internals into a radial exhaust between a bottom portion of the band and a top portion of the fan end bracket. The invention also includes a brush holder clip passing through a vertical opening in the commutator end bracket and engaging a collar on the brush mechanism. The brush mechanism passes through a horizontal opening in the commutator end bracket which intersects with the vertical opening. Armature grounding is achieved by a disk maintained in a recess in the commutator end bracket and urged by a spring against the bearing receiving the motor shaft.

Abstract: A pressure gauge for use with a corrosive fluid containing a sulfide which includes a Bourdon tube made from stainless steel type 316 and having a first or outer hardened layer and a second or inner layer having a hardness equal to or less than Rc22. The Bourdon tube is welded to a socket and to a closure member using stainless steel type 316 such that the weld seals the interface between the first and second layers to isolate the hardened outer layer from the corrosive fluid.

Abstract: Synergically stabilized mixed form halogenated and/or interhalogenated forms of the freebase polyvinyl-pyridine resin for disinfecting water. The resins may be employed in a single pass column or bed system to provide instantaneous disinfection of bacterially contaminated water.

Abstract: A testing and measuring apparatus and method is described for determining the accuracy of pressure transducers under test and for accurately measuring the pressure of a fluid. Accurate calibration of a referenced pressure transducer and automatic correction of the output signal produced by the reference transducer are features of the system. Specifically, the test system includes a reference pressure transducer, input and output fluid ports, solenoid control valves, a microcomputer and a key pad. Input to the reference pressure transducer is coupled to the solenoid control valves which are respectively coupled to the pressure standard, to atmosphere and to the input and output fluid ports. The output of the reference pressure transducer is coupled to a microcomputer programmed to automatically correct the output signal from the reference pressure transducer for certain predetermined inaccuracies and is also preferably programmed to control the operation of the solenoid control valves.

Abstract: A linear variable differential transformer pressure transducer includes a pressure sensing element which is deformed in response to changes in the pressure of a fluid. The pressure sensing element is connected to the core of a differential transformer, the coils of which are mounted on a dashpot within which the core is disposed. The dashpot is filled with a damping fluid which surrounds the core. The core enters the dashpot through an opening in a flexible boot which covers the open end of the dashpot to prevent leakage of the damping fluid. The pressure transducer serves to suppress destructive harmonic resonances of the Bourdon tube by imparting a variable restraining force on the linear movement of the core. The pressure transducer exerts a minimal restraining force to the low frequency movements of the core caused by normal fluctuations in the fluid pressure, but exerts a high restraining force against sudden pressure transients or vibration near the pressure sensing element's resonant frequency.

Abstract: Air trim control actuator mechanically connects a fuel flow device to an air flow device for setting the air to fuel ratio in combustion apparatus. An air to fuel ratio control unit is responsive to electrical input signals from an oxygen sensor that monitors the combustion products in the stack emissions. The air trim actuator includes a pivotally mounted input arm that is mechanically connected to the control unit and is pivoted to a preselected position corresponding to the selected boiler load. The input arm is connected by a link to an output arm which is pivoted through a preselected range of movement to control the position of the damper. The output arm has an elongated arcuate slot for receiving the end of the link. The output arm is pivoted to a position corresponding to the pivoted position of the input arm for selectively positioning the damper to provide air flow to the boiler for the desired air/fuel ratio.

Abstract: A system for extending the temperature range over which diffused semiconductor strain sensing devices specifically can be used includes a semiconductor chip having a base material and a semiconductor device formed in the base material. Biasing potential is applied to the base material and excitation potential applied to the diffused device. The biasing potential and the excitation potential are selected relative to one another to permit a predetermined variation in the semiconductor device characteristic with temperature over an extended temperature range. In the semiconductor strain sensing application, this predetermined characteristic is the impedance of the device. In this way, compensation for the variation of the characteristic can be applied to extend the useful temperature range for the semiconductor device.

Abstract: A gram beam force gauge has a housing having a peripheral wall and a partition with a front face and a rear face substantially perpendicular to the peripheral wall. A pointer overlies a dial mounted on the front face of the partition and is mounted on a rotatable shaft passing through the partition. A pinion on the shaft to the rear of the partition engages a sector gear mounted on a drum which in turn is rotatably mounted adjacent the rear face of the partition on an axis parallel to the axis of the pinion. A flexible band passes around the drum and has each free end connected to one end of an extension coil spring. The first spring has its outer end secured to the housing and the second spring has its other end secured to a slide for preloading the springs and zero adjusting the pointer. A force transmitting beam is secured to the drum and extends beyond the housing. Advantageously, the slide is a slotted block retained by a headed screw secured to the partition.

Abstract: An apparatus for sensing the condition of a pressurized fluid including a semiconductor chip having a diaphragm portion adapted for exposure to the pressurized fluid and an adjacent terminal portion adapted for connection to external circuitry for providing a measurement of the condition of the fluid. The semiconductor chip has sensing elements formed within the diaphragm portion and conductor elements in electrical contact with the sensing elements formed within and extending from the diaphragm portion to the terminal portion. A fluid barrier is provided for isolating the diaphragm portion from the terminal portion to prevent the terminal portion from being exposed to the pressurized fluid, while permitting pressurized fluid to contact the diaphragm portion so that the condition of the pressurized fluid can be sensed.

Abstract: A wet pick-up type vacuum motor fan unit with a separately ventilated motor section and a motor end bracket serving also as a support for, and part of a discharge end housing wall for, the working air fan section, has on the bracket fanward face a centrally apertured metal disk plate defining a flow space or path for bearing sealing air flow from ambient air inlets external of the motor section to a central discharge into the inlet eye of an auxiliary fan clamped on the shaft back-to-back with a larger diameter working air centrifugal fan adjacent the end bracket.