Abstract: A battery powered walk behind floor burnishing unit (10). The unit includes a main frame (12) supported by wheel means (18, 20, 36), the main frame being capable of supporting a plurality of batteries (14). At least one of the wheels (18) may be driven. A burnisher subassembly (22) is mounted on the rear of the frame by a mounting assembly for movement through an from a raised inoperative position through an intermediate ready position to a lowered operative position. The burnisher subassembly includes a drive head (80) and a rotatable drive block (94), the drive block being capable of being rotated by a motor (24) mounted on the drive head. The mounting assembly includes two pairs of parallel links (126, 128) and biasing means (140, 142) which normally biases the subassembly (22) to the raised inoperative position. A vacuum apparatus includes an open cell burnishing pad (114) carried by the burnisher subassembly.

Abstract: In a trench is disposed a closed flexible envelope filled with a fluid having a density or pressure greater than that of the surrounding fluid, movable by itself under the effect of the pressure exerted at its end by said pipe, which envelope is in the form of a cylinder each end of which has been turned in concentrically to its longitudinal axis, in the direction of the opposite end, the two central portions of this turning in being welded together so as to form a central envelope web turned in along its axis.

Abstract: A yellow dental alloy containing a colored intermetallic compound of palladium and indium as 15-85% by weight of the alloy and at least 10% by weight of silver and as desired gold 0-30%, copper 0-45% and silver 10-50%. This alloy exhibits a pale yellow gold color which it derives from the interaction of two white colored metals--palladium and indium. Various alloying additions are specified to improve castability, ductility, strength, hardness, tarnish and corrosion resistance.

Abstract: Apparatus for separating a breathing mask from a helmet automatically upon the occurrence of a predetermined event, the mask having a bayonet connection to a bayonet receiver carried by the helmet. A piston and an explosive cartridge are arranged in an actuator body associated with the bayonet receiver. Upon the occurrence of the predetermined event, as sensed by an activating circuit associated with the receiver, the explosive cartridge generates a shock wave driving the piston against the bayonet in generally right angular relation to the bayonet, thereby forcibly separating the bayonet from the receiver.

Abstract: A continuous casting furnace (10) of modular design. The furnace is made of a crucible section (16) a feed section (18) and a die section (12). Each of these various sections are separable from the other parts, and each of these parts is in turn made up of various individual components. Thus, the crucible section includes a refractory liner (24) made of a non carbon containing material which may be disposed within a monolithic graphite crucible (22). The graphite crucible is provided with a cylindrical aperture at its bottom which receives a feed tube (30), there being a soft seal (32) between the bottom of the liner (24) and the top of the feed tube (30). The feed section and the die section are generally formed in the same manner in that there is a non carbon containing refractory tubular member (48, 64) disposed within a graphite member (50, 62). Between the feed section (18) and the die section (12) is a soft seal (66).

Abstract: A device for accurately displacing a fluid within a chamber. The device includes a barrier wall (38) which separates the fluid (12) to be displaced from another fluid, a rod (32) and a concentric elastomeric tube (34) disposed about the rod and passing through an aperture in the barrier wall, securing structure (58) which secures the ends of the elastomeric tube (34) about the rod (32), a resilient annular element (44) carried by a cavity (48) formed within the barrier wall, and structure to compress the resilient element so that it is forced radially inwardly to seal the resilient tube about the rod. The space between the rod (32) and the tube (34) to either side of the resilient element (44) is filled with a lubricant.

Abstract: A surface mountable electronic device and method of making same wherein a discrete electronic device is encapsulated in a body of electrical insulating material having opposite ends and mounting surface extending between the ends, and an electrode is provided on each end. Each electrode includes a portion on the end of the body in electrical contact with the corresponding lead of the discrete electronic device and a contact portion extending along the mounting surface for making electrical connection to a circuit portion defined on a surface to which the device is mountable. The discrete electronic device is manufactured, prior to encapsulation, by known techniques. Preferably the body is a rectangular solid with each of the four sides having electrode contact portions thereon to serve as one of four possible mounting surfaces each with substantial mechanical stability.

Abstract: Survival apparatus for an aircraft or the like. The survival apparatus includes a survival canister 12 in which survival gear is stowed. The canister assembly is buoyant and water tight. It is stowed prior to use in a cylindrical member 16 which is closed at one end. A maintaining structure 74 is provided to normally maintain the canister assembly 12 within the cylindrical member 16. A handle assembly 90 is provided to provide for the manual withdrawal of the assembly 12 from the cylindrical member 16, the handle assembly also engaging the maintaining structure and causing it to release the canister assembly upon application of force in one direction. A condition responsive gas discharge apparatus 14 is disposed in the closed end of the cylindrical member 16 and, in the event of an accident, it can forceably eject the canister assembly from the cylindrical member.

Abstract: A method of making a dental appliance of the type having a plastic body portion and auxiliary members which extend from the body portion. The method utilizes a dental model formed from an impression taken from the mouth of a patient and includes a step of positioning the auxiliary member on said model so that a portion of the auxiliary member is spaced from a surface of the model. A heated blank of thermoplastic material is then applied to the model and shaped to conform to the shape of the model. Because a selected portion of the auxiliary member is spaced from the model surface, the heated thermoplastic material flows around the selected portion during the shaping process. The selected portion of the auxiliary member is thereby substantially encapsulated in the thermoplastic material and, when the thermoplastic material is allowed to cool, the auxiliary member is securely anchored within the plastic material.

Abstract: A zoning conveyor (10) formed of a plurality of drive rollers (14) upon which are mounted sleeves (40) normally capable of rotating with the drive rollers by frictional contact therewith, but capable of being stopped while the drive rollers continue to rotate. Connecting structures (44, 46 or 78, 80) are provided for interconnecting selected sleeves (40) within a selected zone in such a manner that the selected sleeves within the zone all have the same rotational speed. Stop structures are provided which are capable of stopping at least one of the selected sleeves within a zone from rotating whereby all selected sleeves within the zone are caused to be stopped from rotation by the connecting structures. The stop structure may be a gate (48), a brake in the form of a disk (60) and a shiftable element (64) capable of engaging the disk to prevent its rotation.

Abstract: A non-contacting electrostatic detector comprising a detector electrode sensitive to an electrostatic quantity, a modulator coupled to the electrode for moving the electrode relative to a surface bearing the electrostatic quantity to which the electrode is exposed to produce capactive modulation of the physical capacitance beween the electrode and the surface, and an amplifier having an inverting input serving as a summing node and a non-inverting input, the electrode being connected to the inverting input and the amplifier being connected as a summing amplifier by an impedance connected between the amplifier output and the inverting input. An a.c. voltage signal having a frequency equal to the frequency of the modulator is applied to the non-inverting input of the amplifier. The amplitude and phase of the a.c.

Abstract: A cutting apparatus for forming a V-sectioned groove in a workpiece includes a support surface, a pair of guide rails mounted in parallel relationship with one another and in relatively low relationship with the support surface and a platform mounted upon the guide rails for movement relative to and along the length of the rails. The apparatus further includes a cutter carried by the platform for movement therewith relative to and along the length of the guide rails and including a tipped rotatable cutting tool. The cutter is supported by the platform so that the rotational axis of the cutting tool is oriented generally perpendicular to the support surface and so that the tip thereof is placed relatively close to the support surface. The cutter is adapted to form a V-sectioned groove in a workpiece positioned upon the support surface as the cutting tool is rotated and moved in cutting engagement with the workpiece and as the cutter and platform are moved relative to and along the guide rails.

Abstract: A valve assembly (10) for controlling high pressure gas with low controlling gas pressures. The assembly includes a valve housing (12) having a cavity (22), an inlet port (26) and two outlet ports (28, 30). Mounted within the housing in communication with each outlet port are tubular members (38), each having a closed end (38.3) and an aperture (42) in a smooth cylindrical sidewall (38.2). A wobble bar (50) within the cavity is associated with a rubber-like sheet of material (54), which sheet has two sealing portions (56.2, 56.4) draped over the apertures. A very soft sponge-like resilient block (56) normally holds the sealing portions against the apertures to cause the apertures to be sealed. Actuating structure causes the wobble bar to be moved from a normal position to an operative position, an end of the wobble bar bearing down upon another portion of the rubber-like sheet of material to cause an adjacent sealing portion to peel away from the aperture to permit flow through the aperture.

Abstract: Improved composite tools, such as punches and dies, which tools have very high and abrasion resistant working surfaces. The composite tool includes a relatively soft support, such as a tool steel body, and a relatively hard working portion, such as a carbide, which is firmly mounted within the support in such a manner that axial and radial shocks are dampened.

Abstract: A gas filter canister housing assembly (20) capable of receiving gas filter canisters (28 or 40) of differing heights. The housing assembly includes first and second housing portions (54, 56) and holding apparatus (60) capable of holding the housing portion together. The first housing portion has a cylindrical extension (70) in which a filter canister may be disposed, and the second housing portion includes a cup-shape end portion (102) and a depending flexible skirt (100) which may be held against the cylindrical portion (70) in various positions of adjustment.

Abstract: Hydraulic pressure transducer having an operating cylinder (10) with an operating piston (12) and operating piston rod (14) adapted for rapid traverse, and a transducer piston (22) and piston rod (24) guided within an axially connected power cylinder (20). The transducer piston rod (24) is of a smaller diameter than the operating piston rod (14) and is capable of plunging into the operating cylinder volume (16), the transducer piston rod (24) extending through a seal (58) separating said operating cylinder volume (16) from the power cylinder.

Abstract: An aseptic sampler fitting including a conduit portion for in-line connection between two pipes containing a viscous fluid, a neck portion associated with the conduit portion defining an access opening therein providing access to the interior of the conduit portion, and a cover being securable to the neck portion for covering the access opening defined therein utilizes a gasket positionable between the neck portion and the cover for maintaining a complete physical separation between the cover and the neck portion. The components of the fitting are smoothly-surfaced to facilitate cleaning of the fitting, and the cover includes a plurality of pierceable, self-closing elastomeric stoppers permitting the insertion through the cover of a hypodermic needle or the like for the purpose of extracting a sample of fluid contained within the conduit portion. The cover is constructed of components facilitating ease of replacement of the elastomeric stoppers.

Abstract: An agricultural earth engaging implement formed from two metal plate sections. One piece forms a narrow profile shaft and the other forms the earth engaging portion. The shaft is formed to provide a tapered cavity for receiving a tine and the implement is held on to the tine by frictional forces.