Abstract: A brace and hinge apparatus having upper and lower brace members and a hinge, with a female half and a male half, attached to these upper and lower brace members. The female half contains an inner bearing surface and the male half contains a locking device for locking dowels against the inner bearing surface of the female half and, thereby, the brace members in one, locked, direction and allowing unlimited movement in another, free, direction. A lock release is provided for allowing movement in the locked direction when desired. Further, a tensioner is provided for providing constant tension to the upper and lower brace members in the free moving direction thereby providing constant therapeutic affect when in use. Additionally, a brake is provided to lock the device against movement in the free direction and to relieve the tension from the tensioner when so desired.

Abstract: A variable occlusion device includes a device housing having an occlusion track adapted to receive one or more loops of flexible tubing and having an arcuate reactive surface. The device also includes a rotor member mounted for rotation within the housing about a device axis. The rotor includes a number of carriage passageways or tracks, each passageway or track with an occluding member carriage and occluding member assembly movably mounted therein. The carriage and occluding member assemblies are each adapted to move between an extended position in which the occluding member bears against and collapses the tubing received in the occlusion track, and a retracted position in which the occlusion member is drawn away from and out of contact with the tubing in the occlusion track. The peristaltic device also includes a fluid distribution system for providing an operating fluid from a remote fluid supply under a desired pressure to the carriage passageways of the rotor.

Abstract: Deviations in flatness on a horizontal surface are measured by running over the surface, at a constant driven speed, an instrument sensitive to slope and which generates a continuous voltage signal corresponding to a continuous slope measurement. The continuous voltage signal is filtered to remove extraneous high frequency voltage signals thereby to produce raw continuous analog slope data which is digitized and calibrated to provide calibrated digital slope data from which other flatness data is computed. Procedures are described for calibrating the instrument and for eliminating or compensating for distortions in the measurements.

Abstract: A radiation shielding door of massive concrete mounted to move parallel to a wall surface adjacent a door opening, while supported on a plurality of roller assemblies which travel along a rail mounted in the floor.

Abstract: Improved connections of preformed concrete construction elements wherein one or more metal pins, of any preferred cross-sectional shape, are cast in place, or grouted, extending into each of two elements to be connected, with an elastic grommet disposed between a portion of each pin, in an area on each pin nearest the joint, and the surrounding concrete or grout, whereby the load transfer capacity of the connection is increased about threefold.

Abstract: A laser gauge utilizing a parabolic mirror projects a plurality of laser beams parallel to the principal axis of the parabolic mirror. A plurality of reflector means, e.g., three reflector means, are established in front of the parabolic mirror and are positioned to reflect the laser beams into a plurality of groups of paths at different angles to scan across the object to be measured. Photodetector means is mounted to receive the laser beams after scanning of the multiple dimensions of any such object. Output means, including a microprocessor, is connected to receive the output of the photodetector means to determine the dimension along a plurality of crosssectional dimensions of any object in the groups of paths. When three such groups of paths are used, they may be at 120 degrees each with respect to the other to measure the cross sectional dimension of the object at three different places.

Abstract: An optical system for a visual display comprises a cathode ray tube for projecting a visual image along a central axis and a first fresnel lens for receiving the visual image. The first fresnel lens is provided with fresnel grooves facing the cathode ray tube. Second and third fresnel lenses forming a liquid doublet first fresnel lens pair are disposed in front of the first fresnel lens for receiving the visual image projected therethrough. The first fresnel lens pair is provided with fresnel grooves facing each other. The liquid disposed therebetween is provided with predetermined indexes of refraction and dispersion for color correcting the optical system. Fourth and fifth fresnel lenses are provided forming a second fresnel lens pair disposed in front of the first fresnel lens pair for receiving the visual image projected therethrough. The second fresnel lens pair is provided with fresnel grooves facing each other.

Abstract: Apparatus for determining the position and orientation of a remote object relative to a reference coordinate frame is disclosed. A plurality of radiating means having orthogonal components are centered about the origin of the reference coordinate frame. Means are provided for applying to the radiating means electrical signals which generate a plurality of electromagnetic fields. The electromagnetic fields are multiplexed and thus are distinguishable from one another. A plurality of receiving means are disposed on the remote object, the receiving means having orthogonal components for detecting and measuring components of the electromagnetic fields. The radiating means and receiving means are separated by a distance sufficiently large to insure that the far-field components of the electromagnetic fields are substantially greater in magnitude than the near-field components of the electro-magnetic fields.

Abstract: Apparatus for determining the position of a source of electromagnetic radiation relative to a remote object is disclosed. A multicomponent radiating means of unknown orientation is provided having components centered about the origin of the source. A plurality of electrical signals are applied to the components of the multicomponent source to generate a plurality of electromagnetic fields. The electromagnetic fields are multiplied and thus are distinguishable from one another. A multicomponent receiving means is disposed on the remote object. The multicomponent receiving means is provided with at least three orthogonal components for detecting and measuring components of the electromagnetic fields transmitted from the source.

Abstract: Two mutually orthogonal radiating antennas each transmit electromagnetic radiation to three mutually orthogonal receiving antennas. The transmitted electromagnetic radiation carries data characterizing the phase and magnetic moment of the electromagnetic radiation. Measurement of the two transmitted signals as received by the set of three orthogonal receiving antennas produces information which, in combination with two known position or orientation parameters, is sufficient to determine in a noniterative manner the six position and orientation parameters of the receiving antennas with respect to the radiating antennas. Use of only two radiating antennas increases the speed of the system and simplifies the transmitter. Alternatively, three radiating antennas and two receiving antennas may be provided to simplify the receiver.

Abstract: Two spaced bodies, each including at least two independently oriented radiating antennas, are in communication with each other by such means as an electromagnetic field. The first body receives radiation transmitted from the second body and establishes the pointing angles to the second body with respect to the first body coordinate reference frame. The field received by the first body can include information defining the second body's pointing angles to the first body with respect to the second body's coordinate reference frame and the relative roll about their mutually aligned pointing axis. These pointing angles and relative roll are sufficient for determining the orientation of the first body relative to the second body. The second body receives radiation transmitted from the first body and establishes the pointing angles to the first body with respect to the second body.

Abstract: A laser gauge to measure a dimension of a workpiece is disclosed wherein a laser beam is directed through a beam splitter to a rotating mirror at the focal point of a parabolic mirror. This rotating mirror causes the laser beam to scan the parabolic mirror and establish a series of parallel laser beams emanating from the parabolic mirror and directed toward the workpiece which may be a hot forged bar or other such workpiece in a hostile environment. First and second laser beam paths lie immediately adjacent opposite sides of the workpiece and are reflected back to the parabolic mirror along the same beam paths by a retroreflective surface. The laser beams are reflected by the parabolic mirror and rotating mirror to the beam splitter whereby they are reflected to a photodetector. A microprocessor is programmed to determine the dimension of the workpiece in accordance with the positions of the rotating mirror which establish the first and second beam paths.

Abstract: Three mutually orthogonal radiating antennas each transmit electromagnetic radiation to three mutually orthogonal receiving antennas. The transmitted electromagnetic radiation carries data characterizing the phase of the electromagnetic radiation. Measurement of the three transmitted signals as received by the set of three orthogonal receiving antennas produces nine parameters which, in combination with one known position or orientation parameter, are sufficient to determine the position and orientation parameters of the receiving antennas with respect to the position and orientation of the radiating antennas.