Abstract: A static induction thyristor having a mesh like gate region in front of the cathode, and between the gate region and the cathode a high resistance region having effective impurity concentration of 10.sub.11 cm.sup.-3 -5.times.10.sup.14 cm.sup.-3 is interposed, and the voltage gain decided by the gate length, gate interval and the gate-to-anode distance is made 10 or more so that the forward voltage drop is small, providing high speed switching ability and a large reverse breakdown voltage.

Abstract: A two-stage auger system for filling a valve bag with a particulate material, such as dry powdered or granular material, from a hopper through a valved opening in the bag. The auger system includes a first hollow shaft carrying flights dimensioned and pitched for low speed movement of the particulate material out of the hopper and a second shaft extending through and protruding from the first shaft carrying flights on its protruding portion dimensioned and pitched for higher speed movement of the particulate material from the first mentioned flights. A filling tube is provided to cooperate with the second shaft for higher speed discharge of the particulate material through the filling tube into the bag through the valved opening. Bearings are provided to rotationally seat the second shaft member within the first shaft member on opposite ends of the first shaft member so that the second shaft member can rotate within the first shaft member.

Abstract: A temperature compensated air flow monitor which measures true flow velocity or volume flow. The air flow monitor can be mounted in or coupled to a fume hood and includes a fluid flow tube having a pair of thermistors mounted therein. A first cold thermistor is utilized to provide temperature compensation to the second hot thermistor which provides the fluid flow velocity measurement. The pair of thermistors can be mounted to or in a probe for a portable air flow monitor application. The measured flow velocity or volume flow can be utilized in a display for the operator and also can activate one or more alarms when the flow velocity varies from a desired range.

Abstract: A radon measuring device having a housing formed of at least two mating portions and coupled together by a fastener. At least one aperture extends through the housing to permit ambient atmosphere to enter the housing and includes a filter or membrane positioned to cover the aperture for filtering radon from other particles from the ambient atmosphere as it enters the housing. A radon detector is positioned within the housing for measuring the concentration of radon in the ambient atmosphere which passes through the aperture and the filter into the housing. A filter support member also is inclined for positioning the filter proximate the aperture and pressing the filter against the housing.

Abstract: A method and apparatus for keying digital color TV signals without exceeding the normal sampling frequency (13.5 MHz) and without obtaining a degraded image. A digital keying signal and a digital color TV signal are supplied to upsamplers (10,12), respectively, which double the sampling frequency of the incoming signal by linear interpolation. The 27 MHz sampled outputs are keyed in multiplier (14). In one line to a switch (24) the 27 MHz, 12 MHz bandwidth keyed signal is passed through low pass filter (16) and demultiplexer (18). The latter removes each alternate sample to provide a 13.5 MHz signal of 6 MHz bandwidth. In a second line to the switch the keyed signal is demultiplexed to provide a signal which would have resulted without upsampling, which is then delayed (22). Edge detector (26) senses high frequency keying signals and controls switch (24). In the absence of such high frequency keying signals the signal to the second line to the switch is taken.

Abstract: A shower device for connection to a fixed water outlet that extends out from a vertical wall includes a T-connection having a central opening that is mountable on the water outlet. A first articulated shower-head assembly is movably mounted on one side opening of the T-connection so that a first shower-head can be manually disposed at any position in a first predetermined sector that lies in a plane normal to the wall. A second articulated shower-head assembly is movably mounted on the other side opening of the T-connection so that a second shower-head can be disposed at any position in a second predetermined sector that lies in another plane normal to the wall.

Abstract: An apparatus for longitudinally slitting and/or grooving material sheets, particularly for sheets of corrugated board, which are being transported through the apparatus. The apparatus includes a plurality of tool members positioned in rows on opposing sheet sides which cooperate in opposing pairs. Each set of rows includes a drive shaft and an adjusting spindle in operable communication with the tool members which include tool body members and which can be conducted within the apparatus along guide rails and can be coupled through controllable couplings to the adjusting spindles. Each tool body member also includes a plurality of tool members where at least one of the tool body members and guide rails are adjustable within the apparatus to position the opposing pair of tool members in the operating positions in engagement with the sheet.

Abstract: An electrical connector having a noise-proof metal shell includes a particular construction of the metal shell capable of maintaining reliable connecting condition between the metal shell and grounding elements without causing any faulty connection therebetween even if the connector is used under a condition prone to vibration or suffered from shrinkage occuring in an insulating block of the connector due to aging.

Abstract: A machine comprising a cylinder, a mixer and a plurality of glass balls, the cylinder including perforated walls having an upper part modelled to accept a shaft and fastened on the bottom end to the shaft which conveys the movement originated by an engine to the cylinder. Inside the cylinder, the mixer is integral with another shaft which is co-axial with the first shaft, the mixer being stationary with respect to the cylinder or driven by a separate engine which may rotate in the same direction or in the opposite direction with respect to the movement of the cylinder shaft.

Abstract: An adjustable metering twist lock closure cap for dispensing the contents of a container having a central post including a top surface and a substantially cylindrical imperforate perpheral wall having an opening to the top surface for metering the contents to be dispensed. A cap body is reciprocally mounted on the central post and includes an inner periphery which cooperates with the post peripheral wall to form a variable opening between the cap body inner periphery and the post peripheral wall to provide a closure position and a plurality of dispensing positions for dispensing the contents of the container at a plurality of different rates as the cap body is moved on the post away from the closure position. A detent member is also included to provide a positive indication during movement of the cap body relative to the post that the cap body has reached at least one of the closure position and the plurality of dispensing positions.

Abstract: A method and apparatus for keying TV signals. A keying signal, K, is employed to create first and second modified keying signals, K(A) and K(B), which commence at independent points in time. The modified signals are compared and, as a result, a revised keying signal, R, is produced commencing at the leading edge of one modified keying signal and terminating at the trailing edge of the other. The operator selects R according to one of the two rules (i), (ii), the selection being by trial and error:rule (i):if K(A)>K(B) then R=K(A)if K(A)<K(B) then R=K(B)rule (ii) (which is the converse of rule (i)):if K(A)>K(B) then R=K(B)if K(A)<K(B) then R=K(A).In this manner, the revised keying signal R can be made to coincide with the video signal, V, to be keyed.

Abstract: An immersion pump, especially for low-boiling fluids, having a support for a shaft and a ferromagnetic impeller wheel mounted to the shaft. The support includes at least one controllable electromagnet that operates to axially support and position the impeller wheel. An outlet path is also provided to enable vapor bubbles within the moving fluid to escape from the pump and be returned to the liquid supply.

Abstract: An insulation-piercing connector includes a connector body made of an insulating material, and a plurality of contacts made of a resilient conductive metal. Each of the contacts consists of a contact element to be connected to a contact of a mating connector, a fixing element carried by the connector body and a U-shaped piercing terminal element extending from a surface of the connector body and embracing a wire between legs of the U-shaped element. The contacts are arranged staggered in at least two rows. A cover is maade of an insulating material and formed with terminal element receiving grooves for receiving the U-shaped elements of the contacts. When the cover is covered onto the connector body, the cover forces wire into the U-shaped elements and embraces the wires between the cover and the connector body.

Abstract: A radon measuring device having a housing formed by at least two mating portions. The housing includes a plurality of apertures along at least one of its surfaces to permit entry of ambient atmosphere into said housing, a membrane or filter positioned proximate an interior surface of the housing covering the apertures for filtering the ambient atmosphere which enters the housing, and a radon detector within the housing positioned in a plane substantially normal to the surface of the housing containing the apertures. The housing can also include a filter holder within its interior for positioning both the filter and the detector in their respective positions as well as alignment tracks for alignment of the filter holder with respect to the housing.

Abstract: A method and an installation permit the electronis transmission of data between a master station and slave stations and the simultaneous return of data in the direction of the master station, and this by means of a bus having only two conductors. The digital signals emitted by the master station are at the same time control signals feeding in power to the slave stations. The bits of these signals are of a shape such that they present dead zones during which these signals do not have any effect and during which one can interrupt the faithful transmission, while putting at high impedance one of the conductors of the bit, which allows a momentary alteration of the signal. Such an alteration is obtained by loading strongly the conductor put at high impedance, the presence or the absence of such an alteration constituting the data which has to be transmitted from one slave station to the master station.

Abstract: Apparatus (300) for use in a children's playground comprises a rigid ground-mountable frame (301) and at least one chain (302) having an end attached to the frame (301), and is characterized in that the at least one chain (302) is a chain (2) embedded in a resilient polymeric material (3) and the disposition of the links (4) of the chain (2) is such as to permit the chain (2) and polymeric material (3) structure to stretch resiliently under load.A safety structure (20) for use as a safety net comprises a web of resilient polymeric material (21), and is characterized in that chains (22, 23) are embedded in the polymeric material (21), the disposition of the links (27) of the chains (22, 23) being such as to permit the structure to stretch resiliently under load.

Abstract: A locking device serves to prevent connected receptacle and plug connectors from disconnecting due to external forces. The receptacle and plug connectors have substantially insulating blocks respectively supporting contacts to be connected when the receptacle and plug connectors are connected. The locking device includes anchoring recesses outwardly opening formed in outer surfaces of ends of one of the shells positioned inwardly of the other shell when connected, notches formed in ends of the other shell and positioned correspondingly to the anchoring recesses, locking pieces fixed in a hood of the other shell and extending toward the other shell, and engaging hook-shaped projections formed on the locking pieces and extending inwardly of the shell. The connected receptacle and plug connectors are to be locked so as to be prevented from disconnecting by fitting the engaging hook-shaped projections in the anchoring recesses. Miniaturization of the connector including the locking device is accomplished.