Abstract: A reinforcing tendon assembly for use in a concrete structure is disclosed which includes a pair of tendon anchorages, an elongated reinforcing tendon extending between and anchored by the anchorages and an electrically insulating conduit mounted on the tendon and extending between the anchorages. The improvement in the assembly is comprised of electrically insulating anchorage envelopes mounted at each of the anchorages in sealed relation to the conduit. The envelopes extend around the anchorages and isolate the tendon assembly from the concrete structure. Several isolating envelope constructions are disclosed, which include collars that encircle the tendon and are sealed to the tendon conduit and anchorage surrounding portions which extend from the bearing surface side around the outwardly facing side of the anchorage. A method for forming an electrically insolated tendon assembly is also disclosed.

Abstract: A racket stringing apparatus having an open racket head frame holding fixture and means for tensioning a string drawn across the open area of the head frame wherein the fixture is formed as an annulus circumscribing the racket head frame and the latter is rigidly supported interiorly at its yoke and distal ends and exteriorly at its intermediate opposite sides. The conventional string holding clamp is rigidly supported by and in closely coupled relation to the racket head supporting member for minimizing deflection. The head holding fixture is combined with a rotating structure including a conveniently positioned tool supporting tray. A string guide roller ensures aligned passage of the string being tensioned through the racket head openings and proper automatic rotative orientation of the fixture during tensioning of the string. The apparatus further includes an improved string tensioning clamp.

Abstract: The invention, in its preferred form, involves a pair of complementary substantially half-nut sections adapted to be manually assembled about a stud having a damaged thread to be repaired, the side walls of the half-nut sections being substantially arcuate to form a cylinder when assembled, to receive a socket adapted at one end to snugly slide over the assembled nut sections to retain them in their assembled positions. To preclude relative rotation between the socket and the assembled nut sections, one or both half-nut sections is provided with a planar slope intersecting the proximate arcuate outer surface, which planar slope is adapted to be engaged by a pin passing through the socket along a cord thereof, when the socket is slipped over the assembly nut sections.

Abstract: An internal combustion engine having both an air-fuel mixture and exhaust in the cylinder during the compression stroke with one of the air-fuel mixture and exhaust being in the cylinder at the start of the compression stroke and the other being pumped into the cylinder during the compression stroke, with the shape of the cylinder head being adapted to maintain the air-fuel mixture undiluted with exhaust.

Abstract: A device for aiding in the placement of cross strings in a racket head and having a plurality of transversely spaced substantially coplanar string-bearing surfaces adapted for mounting on a first set of alternate longitudinal strings in the racket head and a plurality of pin-like members mounted for rotation on the support about parallel transversely spaced axes substantially perpendicular to the string bearing surfaces thereon and being mounted for axial displacement. Each of the pin-like members has an offset end rotatable to positions parallel and perpendicular to the longitudinal strings and being positioned for engagement with a second set of longitudinal strings intermediate the first-mentioned strings.

Abstract: A hoisting mechanism for earth scraping equipment adapted for towing behind a vehicle, such mechanism including a plurality of pivotally connected links designed to pivot the scraper bed about rear wheels in a manner that provides for change in elevation of the scraper without affecting the elevation of the towing tongue at the point of towing connection. The hoisting mechanism is readily adaptable to include a pressurized accumulator selectively activated by scraper level by means of a cam operated valve to absorb shock while being towed in an elevated position. Further, the hydraulics utilized to move the rear wall forward for ejecting collected earth are the same hydraulics utilized to draw the rear wheels into the scraper bed for making the scraper narrower and therefore suitable for highway travel.

Abstract: A disposable nebulizer-manifold device which produces aerosol includes a manifold body and a nebulizer unit having a nozzle assembly. The manifold body includes a main supply inlet, exhalation outlet, and a patient connector port. Within the manifold body is a diaphragm assembly which controls the exhalation port.

Abstract: Given the known position of the optical center of an unfinished lens which is to be contoured for an eyeglass frame, this invention relates to a single device for locating and aligning the contemplated geometric center of what will be the finished lens with the optical center so that a block may be secured to the lens at such geometric center for holding the lens for contouring. The device comprises a lens holder situated above a slidable grid scale which is used in combination with a fixed scale to decenter the lens on the lens holder such that the contemplated geometric center of the lens will line up above the position of a block that may be accurately moved into place by moving the same slider containing the grid.

Abstract: A racket stringing machine having a racket head holding fixture and a carriage mounted for reciprocation toward and away from the fixture and a string clamp mounted on the carriage for engaging a string drawn through a racket head mounted on the fixture for tensioning the string upon movement of the carriage away from the fixture; a first brake which is automatically set upon drawing of the string to an elevated tension greater than the desired final predetermined tension to effect a pre-stretching of the string to a length beyond its length at such predetermined tension while permitting a decrease in the string tension; and a second brake which is automatically set to lock the string at the desired final predetermined tension. The apparatus also includes means for providing a controlled restrained rate of increase in string tension and a controlled restrained rate of decreasing string tension at tensions between the predetermined tension and maximum tension.

Abstract: An irradiation apparatus is disclosed in which a low-pressure mercury lamp having a flat, elongated lamp tube is provided that is suitable for high intensity photochemical disinfecting and sterilization of materials. The irradiation apparatus includes a flat outer envelope, surrounding the lamp tube and ducts positioned along the narrow sides of the lamp tube to permit cooling of the apparatus and optionally the efficient generation of ozone. Various structures into which the apparatus may be incorporated for the immersion irradiation of fluids are also disclosed.

Abstract: A controller and method for controlling the operation of electrically powered pool related apparatus in recreational pool system, and more particularly for controlling the flow of pool water through the pool system and water-conditioning apparatus, is disclosed. The controller includes a logic circuit formed with a plurality of logic gates coupled to pool-water-sensing apparatus and programmable input apparatus in accordance with a predetermined logic sequence. The pool system includes a swimming pool and spa, and the pool-water-conditioning apparatus includes a solar water heater and a non-solar water heater. The controller is capable of preferential solar heating and of temperature-switched operation, time-switched operation and a combination thereof, as well as manual switching.

Abstract: A method of utilizing empty aluminum cans to provide a source of electrical energy is disclosed. The method includes the steps of placing the cans in an electrolyte medium, preferably a salt water solution, and positioning a carbon depolarizer in the electrolyte to form an aluminum-air cell. A cup-shaped, inverted, carbon depolarizer and suitable mounting structure for positioning the depolarizer inside a beverage-type can is also disclosed.

Abstract: The three port two-way diverter valve includes a generally T-shaped valve body having one input and two output ports connecting to its hollow cylindrical interior. A cylindrical diverter valve member is rotatably disposed within the cylindrical interior of the valve body. The cylindrical valve member is closed at one end and open at the other with the open end disposed in fluid communication with the input port at the base leg of the T-shaped body. The diverter valve member includes a side port of generally semi-cylindrical shape such that when the side port of the valve member is rotated into alignment with one or the other of the two other output ports, the flow entering at the base leg input port is directed through the respective output port disposed in alignment with the side port in the cylindrical valve member. In this manner, the flow entering the base leg may be diverted to either of the output ports, as desired.

Abstract: A high-pressure, high-temperature gaseous chemical apparatus particularly designed for oxidation of silicon wafers and providing for pressure equalization across the wall of the vessel providing the reaction chamber, for a water boiling enclosure within the reaction chamber and the injection of liquid water under pressure into the enclosure and for the continuous flow through of water vapor at high temperature and high pressure in the reaction chamber while maintaining the aforementioned pressure balance.