Abstract: An improved system including a circuit for igniting a pilot burner each time heat is called for by a thermostat. The main burner is ignited by the standing pilot upon detection of pilot ignition. Trial ignition over a limited period of time is provided. Main and pilot oscillators each having only two transistors are employed to actuate respective main and pilot valves. Each oscillator is of a new type requiring few electronic components.

Abstract: A dual differential pressure/static pressure unit including a housing and three approximately parallel diaphragms sealed therewith forming low and high pressure compartments. Incompressible fluid then fills the respective spaces between the center diaphragm and that on each side thereof. Differential pressure/static pressure sensors are then provided. The housing is provided with passageways to conduct each of said fluids to the respective high and low pressure sides of said sensors.

Abstract: An adapter is described for making connection between the contact pads of a LCC (Leadless Chip Carrier) and the terminals of an ordinary low-cost socket that normally receives the LCC and connects it to a printed circuit board, while also providing connections for test equipment to monitor the interface between the LCC and the printed circuit, or just the LCC, or just the printed circuit. The adapter includes a base element which fits into the socket and which has multiple pads that contact the terminals of the socket, and a test interfacer which attaches to the base element and extends upwardly therefrom. The interfacer has a receiver for receiving a LCC and has leads that extend between the pads of the LCC and the pads of the base element. The leads also have portions that are accessible from the outside so that test equipment can be connected to them to monitor the interface between the LCC and the socket which connects to the printed circuit board.

Abstract: An instrument for measuring simultaneously the flow rate and density of a moving fluid includes means for measuring the frequency and amplitude of vortices shed by interaction of the fluid with a bluff body. Typically the sensing means includes an optical fibre movable in response to pressure changes in the fluid. Computation of the mass flow rate of the fluid can be effected.In one embodiment a light signal from a transmitter (41) is modulated via a sensor (42) and is then fed via a detector (45) and A to D converter (46) to a microprocessor (47) where demodulation and computation of mass flow rate is effected. The microprocessor also provides neative feedback to maintain the output level of the transmitter substantially constant.

Abstract: An electronically commutated d.c. motor having a dome-shaped external rotor and a stator of a double-T-shaped configuration. Stator includes one yoke stack disposed asymmetrically in relation to the longitudinal stator axis. In addition, the stator includes two pole stacks each of which is provided on the same side with an extension in the circumferential direction. A printed circuit board is secured to a mounting flange of the d.c. motor.

Abstract: A contact retention assembly for a front insertion-front release socket contact in which the contact body behind the forward cylindrical mating end thereof is flattened and formed with a transverse opening. The bore in the cylindrical forward mating end of the contact communicates with the transverse opening. Resilient contact retention fingers extend inwardly and rearwardly from the wall of the contact passage to engage the rear wall of the transverse opening to restrict forward movement of the contact in the passage. A tool may be inserted through the forward end of the contact into the transverse opening to deflect the fingers outwardly to release the contact so that it may be removed from the front of the insulator.

Abstract: A device providing summarized information from the digital spectrum analyzer output within a Doppler radar. Four memories, each of 256 word capacity, are included. Each of said memories is addressed by a group of eight bits among the sixteen bits provided by the spectrum analyzer and a logic circuit reconstitutes an elementary summary plot from the contents of said four memories. For a sixteen-line spectrum analyzer it is thus possible to replace a read-only memory for 64K, seven-bit words by the aforementioned four such read-only memories each of 256, seven-bit words.

Abstract: A self-locking connector is disclosed in which locking of the mating halves of the connector is achieved near or at complete mating of the connector. The locking mechanism comprises a cylindrical locking ring mounted in front of a detent ring which rotates with the coupling nut of the connector. The locking ring is formed with circumferentially extending slots providing narrow strips which are axially resilient. The strips carry locking tabs which are engageable with recesses in the detent ring.

Abstract: The high speed operational recurring signature evaluation provides digital sub-systems including a data compressor and a controller. These subsystems are employed with a portable service processor (PSP) which is a standard piece of test equipment in this art. The controller interfaces with the host logic tester (PSP) to provide the repetitious detail and complex digital control requirements for programming the data compressor in response to digital instructions received from the logic tester. A unique serial data pattern corresponding to a proper signature from a node under test generated in real time at the relatively high operating speed of the board under test is generated by the data compressor.

Abstract: An electrical connector endbell in which the endbell housing is slotted so that the cable of the connector may be pushed laterally into the interior of the housing through the slot after the cable has been connected to the contacts in the connector shell. A cover is slidably removable on the endbell housing to close the slot. Screw threads are formed in the interior of the cover and the forward end of the housing for threading the endbell onto the rear of the connector shell.

Abstract: A vibration densitometer including a synchronous detector, a threshold detector, an integrator, an electromagnetic bridge driver, a piezoelectric crystal pick-off, a voltage controlled oscillator (VCO), a phase detector responsive to the crystal output and that of the VCO to control the VCO frequency and/or phase to provide an output signal of a frequency to energize the driver.

Abstract: The monitor screen housing of a CRT type computer terminal forms a monitor module; the base thereof housing the power supply and the electrical interface to other computer equipment forms a base module. The two modules are mechanically and electrically connected to one another in such a way that the monitor module may be supported by and swiveled with respect to the base module and yet may be readily disconnected therefrom. The base module is provided with a raised central region which includes an electrical connector and a circular locking ring having a plurality of horizontally projecting teeth. The monitor module is provided with a recessed central region which includes an electrical connector complementary to that of the base module and a circular locking ring having horizontally projecting teeth that fit between those of the base module only when the base and monitor modules have a predetermined orientation.

Abstract: A self-locking electrical connector is disclosed in which a locking ring is mounted in an annular groove in the interior of a coupling nut on the plug of the connector. When the plug is mated with the receptacle, inwardly extending projections on the locking ring ride up over a low-angle ramp on the shell of the receptacle and then snap into a locking groove formed in the receptacle shell behind the ramp to lock the connector members together. The surface of the locking groove next to the low-angle ramp is formed as a high-angle ramp which allows removal of the projections of the ring from the groove when the coupling nut is rotated with high torque to unthread from the shell. In an alternative embodiment, the locking ring is carried by the receptacle shell, and the locking groove and angular ramps are formed on the inner surface of the coupling nut.

Abstract: A test adapter for a chip carrier having leads along the four side edges thereof. The adapter comprises an inner housing having latches on its corners which engage the undersides of the corners of the carrier body to retain the adapter thereon. The adapter also includes an outer housing on which the test contacts are mounted. The outer housing is pushed downwardly to cause the contacts to engage the carrier chip leads with a positive wiping action.

Abstract: A clean-in-place pump is disclosed in which the hub of the impeller extends into a pocket in which particles from the fluid being pumped may become entrapped. Axial slots in the drive shaft of the impeller create turbulence within the pocket to dislodge the particles. Back vanes on the impeller and passages through the impeller vane mounting disc cooperate to cause fluid to circulate through the pocket to flush out the particles.

Abstract: A disc is provided which centers itself on motor shafts that vary somewhat in diameter. The disc is formed of a single sheet of material with a central hole for receiving the shaft and with a group of fingers projecting slightly into the hole to engage a shaft. The fingers are formed by pairs of slots that extend from the edge of the central hole and radially outward to form fingers of considerable length which can be bent out of the plane of the disc to engage shafts of varying size. The radially inner tips of the fingers lie precisely on an imaginary circle which is slightly smaller than the minimum diameter of a shaft, and the fingers deflect uniformly to hold the shaft centered on the axis of the disc.

Abstract: A solenoid having one or more windings, a plurality of alternate windings of which are connected in electromagnetic field bucking relationship. An alternative construction utilizes layers of bifilar windings. A first winding of each bifilar winding pair in a first layer is adapted to procduce a field to buck the field of a second winding in the same bifilar winding pair.