Abstract: An improved automatic air pressure relief and check valve assembly which may be used in combination with a swimming pool filter tank or a swimming pool separation tank. The valve assembly includes a normally open lower valve which communicates with the inside of the tank and is responsive to the tank's being full of pressurized water for closing the lower valve. The valve assembly further includes a normally closed upper valve communicating with the lower valve and the outside of the tank, the upper valve being responsive to air being expelled from the tank through the open lower valve, when water is filling the tank, for opening the upper valve to permit the air being expelled to exit through the upper valve. Cooperating with the upper and lower valve of the improved valve assembly is means for precluding both the upper and the lower valves from being simultaneously maintained in their closed conditions.

Abstract: Valve assemblies having a valve seat with a conical surface for causing an included O-ring to roll upon and wedge against the conical surface for closing the port when a spherical valve member is forced against the O-ring.

Abstract: A self adjusting bezel assembly for a display screen, and specifically for an infrared radiation touch input display system, including a method for assemblying the bezel apparatus to the display screen. An outer bezel is mounted in fixed relation to the display device, and an inner bezel containing a radiation emitter and detector matrix is retained by and floats with respect to the outer bezel for being urged against the display screen in precise relation thereto.

Abstract: Valve assemblies having valve seats and/or valve members with conical surfaces which cause an included O-ring to roll upon and wedge between the valve member and the seat for reliably closing the valve.

Abstract: A support for an optical device such as an optical read head, permits the optical device to be positionable along a linear path. The support includes a precision bar and two gibs, with first and second adjustable means for securing the gibs to one another and slideably to the bar.

Abstract: An automatic air pressure relief and check valve assembly which may be used in combination with a swimming pool filter or separation tank. The valve assembly includes a normally open lower valve which is responsive to the tank's being full of water for closing the lower valve, and a normally closed upper valve which is responsive to air being expelled from the tank through the normally open lower valve for opening the upper valve during times when water is filling the tank. The upper valve may be selectively opened when air is required to enter the tank so that water may be drained from the tank. Preferred embodiments of the upper and lower valves include valve seats having conical surfaces and respective valve members which cause an included O-ring to roll upon and wedge against its conical seat for reliably closing each valve.

Abstract: A register for maintaining documentation and a description of such documentation, particularly for maintaining photographs of items of property along with a description of the items included in the photographs. The register includes a loose-leaf binder, with a loose-leaf page having one section for containing an inventory record which is hinged to a second section for containing photographs. The inventory section is normally folded upon and facing the photographic section, with the inventory record facing the photographs. An edge of the photographic section perpendicular to the hinge is retained by the loose-leaf binder, and the inventory section is configured with respect to the photographic section such that when the folded page is retained by the binder the inventory section may be unfolded away from the photographic section along the hinge.

Abstract: A method of calibrating the addresses of messages on a copy record duplicated from a master record of such messages having known addresses. Prior to duplication of the master record, first and second cues are recorded on the master record, which cues are separated by a known or determined distance along a track of the master record. After the copy record has been duplicated from the master record and installed in the message retrieval system, the system determines the distance between the duplicated cues on the copy record and derives a correction factor from the distance so determined and the known distance between the recorded cues on the master record. When a message is selected for being reproduced by the message retrieval system, the correction factor is applied to the address of the selected message on the master record to obtain a corrected address of the selected message on the copy record.

Abstract: Apparatus for linearly adjusting the position of devices, and in particular, apparatus for adjusting focus of an image on a light sensitive surface of an image sensor device included in an optical character recognition read head. The apparatus includes a first mechanism for adjustably positioning a lens assembly for adjusting focus at the image plane, and a second device for adjustably supporting the image sensor device for adjusting the position of its light sensitive surface to coincide with the plane of the focused image.

Abstract: A transducer responsive to pressure or force, comprises a diaphragm secured around its periphery to the housing of the transducer and having a cup-shaped portion formed concentrically therein. Means are provided for applying, in use, a pressure or force to one surface of the diaphagm and means responsive to the resulting deflection of said diaphragm for providing an indication of the applied pressure or force. Strain gauges are mounted on an annular portion of the diaphragm which extends between the cup-shaped portion and the periphery of the diaphragm. An overload protection device may be provided to limit deflection of the diaphragm.

Abstract: Apparatus for determining the density of a liquid comprises a resilient tube coupled at each end through resilient couplings to support flanges for connection in a pipeline or the like. Two cantilevers of the same material and cross section as the tube are secured to the tube so that they have a common axis parallel to that of the tube and their free ends are directed towards each other. The tube and cantilever are so excited that they vibrate in antiphase at the same transverse frequency of vibration, the frequency of the vibration being dependent upon the density of liquid in the tube. The cantilevers are provided with an annular collar at their free ends such that when the tube is filled with a liquid of a predetermined density the root shear force and bending moment of each cantilever cancels those of the tube.