Abstract: A food warmer cover is equipped with an inclined door which forms an effective seal against a pair of shoulders formed in the enclosure of the cover. The door pivots about the tops of the shoulders and slides horizontally into the enclosure to make room for lateral guides inside the enclosure. The guides support the door and also support several warming pans in sliding relationship. The door can be pivoted up and away from the enclosure for cleaning, and it is self-aligning when it is replaced following cleaning.

Abstract: An apparatus for injecting a substance into a human or animal comprising a body adapted to have the substance to be injected pass therethrough, a needle mounted on the body and a needle guard mounted on the body between an extended position in which the guard obstructs access to the point of the needle and a retracted position in which the guard does not materially obstruct access to the point of the needle. The guard is releasably retained in the retracted position, and interlocking members on the body and the guard are responsive to generally axial movement of the guard to the extended position for interlocking to substantially prevent movement of the guard back toward the retracted position.

Abstract: A method for the in situ repair of heat exchanger tubes in major heat exchanger equipment is disclosed in which supercooled sleeves are inserted into cracked heat exchanger tubes and are expansion-fitted firmly against the inner walls of the cracked tubes. In order to prevent premature expansion of the relatively long, small diameter sleeves during insertion, the tubes may be filled with a heat sink material which is removed following insertion. The insertion is also preferably accomplished very rapidly by means of a power-actuated ram which maintains the sleeve at its low temperature until the very last moment before insertion. Various guide means and plug means for the sleeve are described. The technology is also indicated as being applicable to the temporary sealing of defective tubes by using a removable plug in the form of a closed-end sleeve into whose interior a cryogenic agent can be selectively introduced during insertion and removal.

Abstract: A computerized executive work station takes the form of an executive-type desk into whose surface a computer display screen and keyboard have been recessed. The screen is disposed at an acute angle to the desk surface and is so positioned with respect to the keyboard that both the keyboard and the screen are concurrently within the field of vision of the near portion of bifocal eyeglasses worn by a person seated at the desk, and at approximately the same distance from that person's eyes. The screen and keyboard are offset from the center of the desk's knee opening so as to preserve a maximum of desk top space within the reach of the person's writing hand. Infrequently used controls, disk drive slots, and the like are mounted on vertical surfaces of the desk so as not to occupy any desk top space; and the screen may optionally be arranged to swing entirely below the desk top so that the screen and keyboard may be covered over for utilization of the entire desk top as a writing surface.

Abstract: A connector for use in builder's scaffolding systems for connecting crossmembers to upright members where the upright members have sockets provided thereon and each of the sockets has an internal clamping face. The connector is coupled to one end of the crossmember. It has an upper and a lower limb spaced apart for receiving the socket therebetween. A generally trapezoidal opening having four sides, two of which are non-parallel, is provided in the two limbs. In engaging the connector, two of the four sides form first and second clamping sides. A wedge coupling member is received within the trapezoidal opening and mounted for clamping engagement with the internal clamping face of the socket and selected portions of the first and second clamping sides. The trapezoidal opening permits connection of the crossmember at a plurality of angles to the upright within the range permitted by the first and second clamping sides.

Abstract: A device to allow a person to bend forward and place the upper portion of his body above the pelvic region in an inverted position across a padded support placed in a doorway, while stretching his legs out and away from the padded cylinder in a direction generally perpendicular to his inverted body. The feet of the user are restrained through straps secured to a lower portion of the doorway. The user is able to stretch his legs out away from each other, away from his body, either singly or in unison, and can also swing the upper portion of his body above the pelvic region using the padded support as a fulcrum.

Abstract: A simple, versatile switching system for ultrasonic transducer arrays uses in-probe concentration and a crosspoint switching matrix, both under the control of a microprocessor in the control unit. The number of crosspoints is kept to a minimum by connecting transducer elements to the pulse delay or receive delay lines in symmetrical pairs; and the high-voltage pulsing is done on the probe side of the switching matrix to allow the use of the same light-duty matrix for both pulsing and receiving.

Abstract: A float having depending fins and a curved surface on which waves impinge. The float provides an additional lift over and beyond its buoyancy. The float is coupled through a swivel to allow it to turn into the direction of waves. The float is additionally provided with an arrangement to compensate for variations in the mean water level due to tide action.

Abstract: A method and device for phase synchronization for use particularly where a fixed internal clock signal generator is used for both receive and transmit functions.The phase difference between the incoming pulse train and a fixed internal framing clock is detected by a counting circuit which provides an output signal indicating the interval time of the phase difference. A delaying means coupled to the incoming pulse train delays the same in response to the output signal for the time indicated thereby and provide synchronism therebetween.

Abstract: A telephone subscriber testing system is disclosed in which all tests may be performed from a central office. A central office test device is connected to the central office by a separate telephone line with a telephone number of its own. Moreover, a dedicated command channel connects the office test device with a remote test device over the carrier lines. This dedicated channel is used to communicate commands and transmit test results back to the central office. By causing the remote device to "dial up" the office device, the entire trunk loop through the PCM trunk and the central office switching equipment can be tested directly in one measurement at the central office.

Abstract: A wave motion motor is disclosed with an impeller moved by a float. The float is coupled to a swivel arrangement to turn in the direction of wave current and has an inclined underside. Also disclosed are means to adjust to tide level and triangular coupling means between the float and a flywheel.

Abstract: A mass transfer device of the type used, e.g., for blood dialysis is made by winding on a mandrel a series of fiber strands, each of which consists of a solid fiber and one or more hollow fibers, the solid fiber being at least as large, and preferably substantially larger, in diameter than the hollow fiber. As the strands are wound on the mandrel they are temporarily anchored at spaced locations along the mandrel by beads of a liquid pre-potting compound which eventually harden into said anchor plates. When the winding is complete, the mandrel is cut at each anchor plate to form individual temporary cartridges which can withstand the handling required in washing and drying. After each individual cartridge is final-potted, the anchor plates are discarded, and the final potting is cut in a conventional manner to form manifold surfaces at each end of the cartridge.

Abstract: Air bubbles in a transparent intravenous solution conduit are detected, regardless of whether the solution is opaque or clear, by directing a light source at the conduit and detecting light shining through the solution with a first light sensor while detecting light reflected from the interior wall of the conduit with a second light sensor. If liquid is present in the conduit, whether clear or opaque, one sensor will see a low light level while the other sees a high level. If air is present, both sensors see a high light level. By EXCLUSIVE-OR'ing the outputs of the two sensors, a logic signal is obtained which is high only when the presence of liquid in the conduit is being detected. Means using two sensor assemblies spaced axially along the conduit, and a counter associated with each, are also provided to allow passage of minor air bubbles, and to provide a backup signal representative of a predetermined volume of air passing either assembly independently of the other.

Abstract: A portable field unit for conducting and controlling emergency telephone communications, particularly in hostage situations, is disclosed. Three telephone lines and a monitoring line can be connected to the unit, which can function as a miniature manually operated central office. A prime operator can control a first line and a common line, while a backup operator can control a second line and the common line. The backup operator can monitor the prime operator's line, and the prime operator's line can also be remotely monitored. The first line and the common line can be patched together by the prime operator for direct communication between them. A privacy switch is provided under the prime operator's control to produce a masking tone in the monitoring circuits when a private communication between the first line and the common line is desired.

Abstract: A day-night picture achieves a realistic reproduction of the twinkling of distant city lights or the like, by backlighting small apertures in the picture with a fine, randomly moving reflection pattern obtained by suspending pieces of crumpled reflective foil from fine threads behind the picture above a light source whose heat creates convection currents which slowly move the foil pieces in a random manner.