Abstract: A rotary pneumatic tool includes an over-speed shut-off mechanism including a shiftable spring washer and flyweights for imparting a shifting force to the spring washer dependent on the speed of the tool. In the preferred embodiment, the spring washer is shifted by spherical balls restrained by cylindrical walls within a body affixed to the rotor in combination with the spring washer and spring members attached to the body. The spring rates of the spring washer and spring members predetermine the speed at which the over-speed mechanism becomes activated.

Abstract: A reciprocating plunger pump is provided with a power section frame having open sides and vertical load-bearing walls spaced apart along the length of the frame. Separate, individually removable cradles are mounted on both sides of the frame directly to and extending between pairs of vertical walls. The cradles provide guides for linear reciprocating motion of main crossheads, which are attached to connecting rods driven by a rotating crankshaft. The cradles and the vertical walls are load-bearing so that the crankshaft may be rotated in either direction. The individually removable cradles provide easy access to both sides of the power section of the pump for inspection and maintenance of the power section components.

Abstract: A constant velocity joint (10) is provided specifically for connecting a yoke (14) to a mast (12) in a helicopter and more generally (200) for interconnecting a first shaft (202) to a second shaft (204) for bidirectional drive. The constant velocity joint employs a carrier (40, 218) which is formed with a series of apertures for receiving elastomeric bearing assemblies (42, 80, 220). The elastomeric bearing assemblies are provided with a spherical elastomeric bearing (60) and a cylindrical elastomeric bearing (48). Certain of the elastomeric bearing assemblies connect the carrier to one of the rotating members while the remaining elastomeric bearing assemblies connect the other rotating member to the carrier. The axis of symmetry (67) of the carrier always bisects the angle of misalignment between the two rotating shafts or members to assure that a constant velocity joint is achieved.

Abstract: An interlock grate structure is provided which includes longitudinal load bearing span bars having lateral locating holes spaced therealong for receiving transverse tie bars, the transverse tie bars having axial locking means which engage the longitudinal span bars at the point of juncture to prevent axial displacement of the tie bar relative to the span bar. A longitudinal lock rod serves to interlock the position of the transverse tie bar locking means with respect to the longitudinal span bar.

Abstract: A culture container having a convenient size for use under a conventional microscope stage. The container having media of a composition and amount effective to induce germ tube production in Cryptococcus. The media, which includes purified saponin, oxgall, a substrate for phenol oxidase, water and ammonia ions, is in an amount up to 5 milliliters at a depth up to 4.5 milliliters.

Abstract: A method for purifying source water to obtain sterile, low-sodium water is described. The improved method employs ion-exchange, adsorption, filtration by particulate size, ultrafiltration, and reverse osmosis in combination with a closed holding system requiring only 2-3 ppm chlorine for sterilization. A method for storing treated water sterilized with chlorine, keeping the chlorine uniformly distributed during storage, and for removing the chlorine just prior to using the water while maintaining sterility of the water is also disclosed. An additional aspect of the invention is novel sterile filtration means, disclosed for removing chlorine from treated water, comprising a receptacle for activated carbon particles, having a water inlet and a water outlet, yet which is sealed from contamination from airborne microbes, and an effective number of carbon particles. The novel filtration means is wholly autoclavable.

Abstract: A composite sintered rock bit insert for use in a rolling cutter is fabricated from two tungsten carbide components. The first component is formed of a tungsten carbide composite that is less wear resistant, but tougher, than the second component. The two components are joined at a parting plane which extends to an earth-engaging surface of the insert. The insert is mounted on a rolling cutter such that the component having the lower wear resistant properties is on the leading face of the insert. With this combination, the wear pattern of the insert maintains a crest-like configuration at its rock engaging surface.

Abstract: A process for the recovery of sulfur from sulfur-bearing ores employing an aqueous leaching solution containing calcium monosulfide, calcium hydrosulfide or mixtures of such calcium sulfide species. The sulfur ore is contacted in an extraction zone with the aqueous leaching solution under conditions to solubilize sulfur from the ore in the form of calcium polysulfide. Preferably, the extraction step is carried out at an elevated temperature. The loaded leaching solution is recovered from the extraction zone and applied to a sulfur-production zone. Here the loaded solution is contacted with hydrogen sulfide under conditions to react the hydrogen sulfide with the calcium polysulfide to produce calcium hydrosulfide and elemental sulfur. The calcium hydrosulfide solution is recycled for use as leaching solution in the sulfur extraction zone.

Abstract: A control valve (10) is disclosed for use in controlling a winch motor (12) on a winch. The control valve (10) is employed with a conventional operating valve (32). When the operating valve is in the neutral position, the control valve (10) acts as a hydraulic brake and an unloading valve for a brake cylinder (20). When the operating valve (32) is moved to raise a load with the winch, the control valve provides a flow path to and from the winch motor (12) to rotate the motor to raise the load and provides sufficient hydraulic pressure in the brake cylinder chamber (18) to release the brake even if the winch has no load. When the operating valve is operated to lower the load, the control valve (10) acts as an over center valve to prevent the load and winch from running away from the winch motor (12). The control valve (10) accomplishes each of these functions with only a single valve spool (132) slidable in a valve housing (100).

Abstract: A crane block (FIG. 2) is provided for traveling along a central main fall symmetry line (78) defining vertical travel during movement of a hoist within a barge mounted crane. The crown block (50) is mounted to a crane boom (12) and includes a first row of relatively large diameter sheaves (54) in tandem with a second row of relatively small diameter sheaves (58). A movable block (76) is provided between the traveling block (74) and the crown block (50) and includes a third row of relatively small diameter sheaves (60) which are reeved together with the second row of sheaves. A traveling block (74) is provided with a fourth row of relatively large diameter sheaves (56) which are reeved together with the first row of sheaves (54). Sheaves in either the second (58) or third (60) rows are horizontally canted with respect to the main fall symmetry line (78) for vertical travel of the rope which is reeved between the rows.

Abstract: A heat exchanger unit having opposed pan shaped sections with perimeter flanges which are folded one over the other to secure the sections together. The section having the inner flange is formed with a displaced flange portion or bead all along the perimeter flange portions, which bead is elastically displaced by the folded over flange to form a substantially leakproof joint.

Abstract: A ballast circuit is provided for the start-up and operation of gaseous discharge lamps. A power transformer connected to an inductive/capacitive tank circuit drives the lamps from its secondary windings. An oscillator circuit generates a frequency modulated square wave output signal to vary the frequency of the power supplied to the tank circuit. A photodetector feedback circuit senses the light output of the lamps and regulates the frequency of the oscillator output signal. The feedback circuit also may provide input from a remote sensor or from an external computer controller. The feedback and oscillator circuits produce a high-frequency signal for lamp start-up and a lower, variable frequency signal for operating the lamps over a range of light intensity. The tank circuit is tuned to provide a sinusoidal signal to the lamps at its lowest operating frequency, which provides the greatest power to the lamps.

Abstract: A fluid delivery system (10) is provided for delivering at least one chemical (26) onto a field in a desired concentration. A carrier fluid (67) is provided for diluting the farm chemical (26). The mixture is pumped through a spray boom (18) onto the field by a main fluid pump (74). The chemical (26) is delivered to the inlet port (76) of the main fluid pump (74) by a chemical pump (54). The chemical pump (54) is operated by a variable speed stepping motor (56). The speed of the stepping motor (56) is controlled by a speed sensing wheel (88) to provide a uniform concentration of chemical on the field independent of vehicle speed. The motor speed is also controlled by a thumbwheel switch (116) to deliver a desired concentration on the field compensating for drive vehicle wheel slippage. The motor speed is also adjusted to calibrate the delivery concentration to the nozzle pattern through calibration switches.

Abstract: An air diffuser (10) is disclosed which has the significant advantage of employing only three subassemblies at the point of installation, including a base (12), a cone assembly (14) and a single bolt (16) to fasten the subassemblies together. Contoured rods (26, 28) are mounted with the base (12) to receive channels (48) on a series of brackets (46) to align the cone assembly and base. The brackets (46) forming the channels (48) also perform the function of securing a middle and lower diffuser cone together. A method of manufacture is also disclosed.

Abstract: A holder (10) is provided for holding fluorescent light bulbs (14). The holder (10) is used with a ladder (14) having a rail (24). The holder (10) includes a lower bracket (20) for receiving an end of the fluorescent light bulb (14) and an upper bracket (22) for receiving the upper portion of the fluorescent light bulb (14).

Abstract: An electronic calendar is provided for displaying time of the day, day of the week, and month-date-year with automatic adjustments for leap years and changes to and from standard and daylight times. The electronic calendar also displays preprogrammed and user programmed information such as holidays, holy days, birthdays, anniversaries, appointments, horoscopes, and other messages. In addition, the electronic calendar incorporates a method for randomly selecting and displaying programmed messages, such as advertisements and safety slogans, at recurring times to reinforce the user's memory of such messages.

Abstract: A load-out construction device (10) is provided for conveying debris from a building (12) having a roof (14), floors and an exterior wall (16). The load-out construction device (10) includes a hopper (18). The load-out construction device (10) further includes a suspension system (30) including a pair of hooks (32) which are mounted to end walls (20, 22) of the hopper (18). An end (32a) of each hook (32) contacts the roof (14) or a floor of the building (12) and an end (32b) of each hook (32) contacts the exterior wall (16) of the building (12).

Abstract: A downhole tool for controlling the flow of fluids through the well casing includes a tubular mandrel with a flow control valve therein. A radially expandable seal member encircles the mandrel and a sub-bottom defines an abutment member, attached to and movable with the mandrel, for engaging one side of the seal member. A bottom cone is positioned around the mandrel and on the opposite of the seal member from the sub-bottom. The cone has a sleeve extending therefrom positioned between the seal and the mandrel on which the seal member is carried. An upper cone is positioned around the mandrel with slips segments being positioned between the upper and bottom cones. An upper radially expandable seal member encircles the mandrel and its carried on a sleeve extending from the upper cone. A lock hub is positioned around the mandrel and on the side of the upper cone opposite the upper seal and slip segments.