Abstract: A wheel holder assembly includes a mounting frame fixedly fastened to the footplate of a skateboard, a screw bolt mounted in the mounting frame, a hook plate mounted on the screw bolt and hooked on a barrel at the mounting frame, a swivel wheel holder frame mounted on the screw bolt to hold a pair of wheels, a first corrugated washer and a second corrugated washer mounted on said screw bolt and matched with each other between the hook plate and the wheel holder frame, the first corrugated washer having a locating groove engaged with a locating rib at the wheel holder frame for enabling the first corrugated washer to be turned with the wheel holder frame about the screw bolt relative to the second corrugated washer, and a compression spring mounted on the screw bolt to force the wheel holder frame against the first corrugated washer.

Abstract: A headphone mounted 3-in-1 anti-noise radio sound-collection device is described. The device includes an anti-noise circuit system, a radio am/fm circuit system, and a sound collection system for receiving an external sound. The structure is wireless with a microphone and associated cables contained in the headphone headband. The microphone is provided to receive an external noise signal, and the device then generates a nullifying out of phase signal. The device uses a sound collection device to receive an external signal and an am/fm radio is also provided, all of which sound through the ear speakers on the headphone.

Abstract: An automatically operated steamer for cooking and warming food products is described. The steamer uses three operating thermostatic controls, a housing with a reservoir in the bottom thereof, and an electrical heat source disposed below said reservoir to heat the same. When cold water is admitted to the reservoir a thermostat closes to generate heat to warm the water and as the water warms, the flow of the water into the reservoir ceases. When the reservoir water reaches a temperature slightly above its boiling point, a second thermostat operates to control the temperature to keep the water boiling until it completely evaporates. When the water evaporates the heat within the device steamer increases, and another thermostat opens at a predetermined elevated temperature to signal for the addition of water to the reservoir.

Abstract: A connector for making an electrical connection with a mating interface (17) includes a hollow conductor (1) within which is included a member (9) which is relatively movable with respect to the conductor (1). Resilient means (12), which may be a spring, is located between the conductor (1) and member (9). In a first state of the connector, the conductor (1) and member (9) are in a relative position in which the resilient means (12) exerts a force between them urging them together. Following a mechanical connection made between the member (9) and the mating interface (17), the connector is set in a second state in which the force applied by the resilient means (12) takes effect, moving the conductor (1) and member (9) towards one another to make an electrical connection between the conductor (1) and the mating interface (17). This allows a connection to be made with only minimal force and no torque, making it suitable for fragile connections.

Abstract: A magnetron has an output comprising a coaxial line 15 which transmits energy from a wanted oscillator mode as a first coaxial waveguide mode and energy from an unwanted oscillator mode as a second cylindrical waveguide mode. Energy in the cylindrical waveguide mode is intercepted by slots 17, 18 in the coaxial line 15 and absorbed by material 10. This enables the modes to be separated. Preferably, the output is taken from the axis of the magnetron and the wanted oscillator mode is the &pgr; mode.

Abstract: A structure for increasing the cargo carrying capacity of a helicopter when the cargo is suspended below the helicopter chassis is described. The structure includes a depending skirt surrounding the helicopter wheels or struts and extending outwardly over the suspended cargo. The skirt is substantially frustro-conical in shape and provides a peripheral lip extending substantially horizontally for deflecting prop down wash from the helicopter rotor away from the suspended cargo.

Abstract: A collapsible, recessed wheel chock is described. The chock is intended to be mounted in the bed of a truck or trailer and can be collapsed into a flush mount with the bed when not in use. The chock when in use is rotated from the closed position into an open position which is at an obtuse angle to the bed, and is supported in that position by right and left supports so that a wheel of a motorcycle or the like can be received against the open chock and retained between the lateral supports against movement The supports also function to prevent damage to the chock in the event the retained vehicle wheel. attempts to move forward.

Abstract: An air pumping/extracting duplex pump for use in an inflatable device for selectively pumping air into/out of an air chamber of an inflatable device is constructed to include two connected housing, and an actuating mechanism mounted in the housings and manually rotatable between a first position for drawing air into the inflatable device and a second position for drawing air out of the inflatable device.

Abstract: A belt of collated nails for use with an air-driven nailing gun is disclosed having a plurality of nails, a plurality of flexible nail guide caps connected in series and respectively capped on the points of the nails and adapted to guide the nails into the workpiece, and a plurality of breakable flexible sockets connected in series and spaced above the flexible nail guide caps and adapted to hold the nails in the flexible nail guide caps, the breakable flexible sockets each having a through hole for receiving the nails respectively.

Abstract: A camera producing colour video outputs may employ an image intensifier 5 and a monochrome CCD sensor 3. The scene is exposed through filters F3, F4 which may each contain stripes of subtractive primary colours alternating with clear regions. The video is decoded using waveforms derived from a memory which records the output of the sensor when imaged on, for example, primary colours such as red and blue, producing trains of pulses which identify the spatial regions of each line corresponding to the spatial areas of the pattern on the sensor produced by the colour filters F3, F4, in order that actual scenes can be decoded using the stored waveforms, for example using sample and hold devices. A colour interference signal is generated in matrix addition circuitry 10 to produce a luminance signal which has stripe visibility removed from it, permitting high resolution video signals to be obtained.

Abstract: An electron gun arrangement includes a cathode having a front surface and control grid located in front of it. The control grid is mounted via a cylindrical support on a Kovar mount. The cathode is supported by a cylindrical support mounted on a Kovar support. Ceramic material being located between the two supports. The vacuum envelope within which the electron gun is contained includes the Kovar support and a flexible member with which it makes a vacuum seal, this member being of copper. The copper member is sealed to a ceramic cylinder via metal flanges. The assembly permits the spacing between the cathode and grid to be maintained while the copper member permits thermal expansion to occur to maintain vacuum integrity.

Abstract: A Wireless Concealed Transmitter Stereo Center Speaker System includes a concealed transmitter unit installed a center speaker, and two receiver units installed in two rear speakers, wherein the concealed transmitter unit includes an automatic audio level regulating circuit to regulate the audio level of the output signal of audio equipment to a predetermined range, a power control circuit controlled by the output signal of the audio equipment to provide the necessary working voltage, and an inductance antenna to transmit stable output signal from the audio equipment to the receiver units of rear speakers; the receiver units are of low working voltage design, including an automatic 24-time frequency divider circuit to effectively discriminate left and right sound tracks, and an auto-shut off circuit to automatically cut off power supply from either an alternating current source or battery power supply when the audio equipment does not work; the concealed transmitter unit and the receiver units further use a r

Abstract: A tripod is constructed to include a platform unit, which enables the platform thereof to be adjusted horizontally through 360°, a support unit for enabling the platform unit to be adjusted to the desired tilting angle, the support unit having a rear leg pivoted to a center post thereof, and a mounting leg unit adapted for securing the support unit to a tree, table top, or the like, the mounting leg unit having a short leg and a long leg adapted for making a scissors action, a clamping foot member pivoted to the short leg, a lock adapted for locking the legs, and an adjustment screw adapted for moving the clamping foot member relative to the long leg.

Abstract: In a solar cell arrangement, a generally rectangular solar cell has mutually orthogonal sides in plan view and a third oblique side to them which adjoins them. A protection diode is located in the region bounded by the third side and projections of the first and second sides. The protection diode is electrically connected to the solar cell. Use of the invention enables protection to be provided individual solar cells of a solar cell array without a significant loss in the area occupied by the light sensitive solar cell surfaces.

Abstract: In a catalytic sensor, a bead is located within a can having an aperture in its front surface. The bead is surrounded by thermally insulating material such as glass fiber and a filter material is arranged between the bead and the aperture in the can. This acts to remove H2S or other inhibiting gases before they reach the bead and impair its performance. The thermally insulating material allows the filter material to be included whilst still permitting the bead to be operated at a high temperature.