Abstract: This underwater drysuit has a waterproof zipper device 30 that opens/closes and defines a body covering/uncovering opening part 22 that is provided extending from one of shoulder parts to the other one of the shoulder parts on top of arms across a chest part of a drysuit main body 20 in a chest width direction. This device is configured in the form of a horizontal line in the chest width direction to have a dual structure with a first waterproof zipper 40 and a second zipper 50 located above the first waterproof zipper in a vertical direction.

Abstract: This underwater drysuit has a waterproof zipper device 30 that opens/closes and defines a body covering/uncovering opening part 22 that is provided extending from one of shoulder parts to the other one of the shoulder parts on top of arms across a chest part of a drysuit main body 20 in a chest width direction. This device is configured in the form of a horizontal line in the chest width direction to have a dual structure with a first waterproof zipper 40 and a second zipper 50 located above the first waterproof zipper in a vertical direction.

Abstract: A cashless business transaction system (e.g., a vending system, a material tracking system, or a highway toll system) incorporates a method and apparatus for transmitting a digital information signal. A signal generator (311) generates a constant frequency signal. A phase modulator (305) varies the instantaneous phase of the constant frequency signal to represent digital information, thereby producing a phase modulated signal (325). A tuned resonant circuit (307) filters and averages the phase modulated signal to produce a simulated FM signal, and transmits the simulated FM signal via its antenna (309). One such business transaction system (e.g., a vending system) incorporates such a transmitter to facilitate transmission of billing information from a device located within a substantially electrically shielded environment.

Abstract: An RF signaling system and system for controlling the whereabouts of animals utilizing same functions, in a preferred embodiment, by efficiently establishing well-defined electronic boundaries using small, battery powered transmitters transmitting constant envelope RF signals in a near-field regime by repetitively delivering trains of brief, low duty cycle pulses of electrical energy to a resonant circuit which includes an antenna at a low RF carrier frequency corresponding to the resonant frequency of the circuit. During intervals between pulses, the resonant circuit is effectively isolated from the circuit delivering the pulses to minimize loading effects. Further energy efficiency is achieved by interposing inactive interals between at least some successive transmissions of the RF signals represented by the pulse trains. The RF signals emitted by the transmitters are digitally encoded as are those emitted from a wire loop coupled to an optional wire loop unit to define a wire loop boundary.

Abstract: A blower wheel for an electric motor driven fan includes an impeller in concentric alignment with a back plate. The back plate has an interior sleeve with a plurality of inwardly directed ribs that define a motor receiving circle in which a motor is disposed. Gaps between the ribs form a cooling shroud about a motor rotor such that when the blower wheel is rotated the plurality of ribs force high velocity air through the gaps and over the outside surface of the rotor. The blower also includes a shroud positioned about the blower wheel and motor having inlet and outlet air openings.

Abstract: A camera housing of generally rectangular shape with sides and ends and having a housing bottom and a housing top, with the top hinged to the bottom along one of the sides of the housing for pivoting between a housing open position for installing and removing a camera, and a housing closed position for holding the camera in place in the housing, and a camera clamp for attaching to the camera, with the clamp having a body for overlying the camera and opposed wings projecting laterally from the camera, with each of the wings having outwardly projecting fingers with spaces therebetween, and with the housing bottom having opposing side walls defining a camera receiving section, each of the walls having laterally inwardly projecting fingers with spaces therebetween for engaging the camera clamp outwardly projecting fingers for positioning the camera clamp and camera in the housing.

Abstract: A method of manufacturing a convoluted heat exchanger core from a continuous sheet of thermally conductive metallic material includes providing a pusher bar assembly having a table, a pusher bar plate mounted transversely across the table and a stripper bar plate mounted transversely across the table in opposed relation to the pusher bar plate. The pusher bar plate is moveable along the length of the table between a feed position that is spaced a predetermined distance from the stripper bar plate and a fold position that is located adjacent the stripper bar plate. The sheet of material is fed lengthwise onto the table and into engagement between the pusher bar plate and the table with a portion of the sheet of material located between the pusher bar plate and the stripper plate when the pusher bar plate is in the feed position. The portion of sheet material is folded into a convolution by moving the pusher bar plate to the fold position.

Abstract: A transmitter prepares digits for transmission, e.g. as spread spectrum data accompanying commercial radio, using code sequences having exactly zero cross-correlation. The code sequences include phased versions of the maximal length sequence, with an additional "0" bit appended to the end of each phased version. Information signals (which may be analog signals, or digital signals encoded as two or more analog levels) are transmitted by multiplying each information signal by one of the code sequences, and adding the resulting sequences together to form an output sequence for transmission. A receiver that recovers the information signals correlates the received sequence with each of the code sequences, producing results which are directly proportional to the information signals.

Abstract: The whereabouts of a pet or other animal are controlled using one or more transponders to established a boundary. The transponders receive an incident signal from a transmitter and generate a distinguishable return signal which, when the animal moves into proximity of the boundary, is received by a unit affixed to the animal to initiate application of an aversive stimulus which deters the animal from traversing the boundary. The transponders can be active or passive and can be located to establish either fixed or mobile boundaries.

Abstract: A chair for conducting the electrostatic charge of an occupant to the floor on which the chair rests, with the chair seat carried on a support unit which permits rotation of the seat and adjustment of the height of the seat above the floor. The support unit includes an outer sleeve and an inner sleeve moving vertically relative to the outer sleeve, and an electrical resistor connected between the inner and outer sleeves and in sliding contact with at least one of the sleeves, typically by means of a spring finger strip mounted in a groove of a bushing or collar.

Abstract: A static monitoring system for use with an electronic manufacturing work area, typically a conventional work bench having an electrical conducting strap for connecting the operator's wrist to earth ground, and including a circuit for indicating when there is an earth ground connection and circuitry for indicating when an electrostatically charged object, such as another human, approaches the work station. An antenna is positioned at the work station spaced from the working surface and from the operator, with the antenna connected as an input to an amplifier circuit which measures the change in electrostatic field strength and hence the approach of a charged object, with an indicator providing a visual or audible alarm or both. An oscillator provides an ac signal to each input of a differential amplifier, with one input connected to circuit ground through a capacitor and the other input connected to a wrist strap or the like on the operator.

Abstract: An ejector for a printed circuit board plug-in unit for use with printed circuit board cages having a fixed ejection surface. The ejector is constructed and defined to be pivotally mounted through an aperture provided for the panel member of the plug-in unit for pivotally engaging the fixed ejection surface of the cage system for extracting the electrical connector carried by the printed circuit board of the plug-in unit from the electrical connector of the cage system. The ejector has a handle portion with an extraction portion extending through the aperture of the panel along with a portion defining a bearing surface for engaging the fixed ejection surface. A bracket secured to the panel member also pivotally secures the ejector extraction portion to the printed circuit board.

Abstract: A male-female keying device formed of two elongated strips, one on each element that is to be keyed. Correspondingly positioned holes are in each strip. A few projecting male pins are located in selected holes in one strip and several non-projecting pins are located in each hole of the other strip except those holes that are positioned to receive the male projecting pins. A pair of spaced apart elongated pins act as guides in assembling the two strips.A relatively large number of holes in both strips allows a very large number of codes to be arranged, whereby only one pair of male and female strips can be mated.

Abstract: A dual inline integrated circuit socket having nonpluggable electrical pin positions relative to receiving the leads of an integrated circuit package. The socket provides this function by means of a cap having "blind" positions or a "short" cap to allow access to the nonpluggable electrical contacts.