Abstract: A flexible pad with two self-securing straps for mounting a transducer to the arm of a patient.

Abstract: An apparatus, for measuring head accelerations of a test subject, having a mouthpiece which includes metal clips for securing the mouthpiece to the upper teeth of the test subject. Three accelerometers are secured to a mounting block which is attached to the mouthpiece. The three accelerometers have their active axis located along three orthogonal axis through the mounting block. The mounting block, the accelerometers and the accelerometer leads are embedded in an electrically insulating material.

Abstract: In the cardiac pacer lead construction disclosed herein, long life and fatigue resistance is obtained by utilizing as a conductive element a thread of conductive carbon filaments in a resin matrix. The thread is helically wound between a stimulation electrode structure at the distal end of the lead and a terminal at the proximal end, the terminal being adapted for connection to a stimulation pulse generating circuit.

Abstract: A smoker's appliance capable of producing aircooled smoke in a sanitary and ashless manner for the pleasure of the user. The appliance is generally shaped like a gun having a cylindrical body with a threaded head at one end. A tube extends through an aperture formed in a cap which is threadedly engageable with the head. With the cap tightened onto the body, the tube permits communication between the chamber and the surrounding air. A flexible bulb is attached to the body at a location near an end opposite the head. By the use of appropriate check valves, the bulb, when squeezed, forces air into the chamber within the body without permitting its escape. When a lighted cigarette is inserted into a free end of the tube within the chamber, operation of the bulb causes a unitary direction of air flow through the appliance which assures long life for the cigarette. Cigarette smoke thus passes through the cigarette itself and exits from the tube, being preferably directed into the mouth of the user.

Abstract: An article that serves the dual function of a smoking pipe and drinking receptacle, and thereby permits the concurrent smoking of tobacco and consumption of a beverage through use of a single instrument. The article has the general configuration of a mug, comprising an inner shell that forms a reservoir for holding a beverage and a surrounding outer shell having smoke input and output means, a smoke chamber normally containing a smoke filtering agent being provided between the inner and outer shells to accommodate the travel of smoke between said input and output means. The smoke chamber is securely sealed from the reservoir to prevent contamination of the beverage by the smoke or filtering agent, while the inner shell serves to conduct heat between the chamber and reservoir to provide auxiliary cooling of the smoke.

Abstract: The device enables the machine to undergo without damage the passage of deformed metal sheets or metal sheets whose thickness exceeds the gap between the rollers of the machine. For this purpose, the upper rollers carried by an upper frame of the machine are mounted in bearings which are supported elastically by means of spacer blocks. Sealing elements operating under conditions particular to each sealing element are provided. The main application of this device is in machines for effecting an accelerated cooling or hardening of metal sheets.

Abstract: An apparatus for electrohydroblasting of castings comprises a base, a bath, a mechanism for feeding castings into the bath, having a movable platform mounted in vertical guides, and a loading device. The loading device comprises horizontal guides and a means for conveying castings along the horizontal guides. The horizontal guides have a section disposed above the bath and sections mounted on the base. In accordance with the invention, the section of the horizontal guides, disposed above the bath, is mounted on the movable platform of the mechanism for feeding castings into the bath.

Abstract: This invention relates to a tent which may be transported in an automobile trunk suitable for camping which comprises a frame comprised of first and second end members and two side members, each of the side members being of adjustable length to permit the distance between the end members to be varied and a first frame support means, upon which the first end members rests, adapted to be secured to a transportation vehicle; and a second support means hingedly connected to the second end member, such that in a compressed position it lies in substantially the same plane as the frame, and in an extended position supports the second end member, the second support means being adjustable such that the second end member may be maintained at the same elevation as the first end member.

Abstract: A tent comprises a trapezoidal floor, two congruent trapezoidal side walls contiguous at the ridge line, a front wall in the shape of an equilateral triangle and including a door opening, and a rear wall in the shape of an obtuse isosceles triangle; wherein the triangular perimeter at every transverse cross-section is constant. The tent is supported principally by a tension line through the ridge line of the tent which is secured to a point outside the front of the tent and higher than the peak of the front, and is also secured to a second point outside the rear of the tent at the ground, with the floor and side walls of the tent being held in membrane tension by ground stakes at the lower apex points of the front and rear walls. The front door panel is held closed by an elastic member stretched in a straight line across the threshold and attached along its length to the shirred lower edge of the door panel.

Abstract: The following specification discloses a retractable awning for a vehicle. The awning has a portion which serves to form the outside cover thereof when it is stowed and has a plurality of main bracing arms that are angularly secured to the side of the vehicle by brackets attached thereto and a pair of stabilizer arms which stabilize the awning in an extended position when held by the angular bracing members. Both the bracing arms and the stabilizer arms fold into a lead bar which can be wrapped within the awning proper and attached to the side of the vehicle whereby a portion of the awning forms a cover therefor. A pair of fairings or nacelles are secured to the ends of the awning when it is in its stowed condition in order to maintain the awning in a smooth, streamlined configuration.

Abstract: A milking apparatus is disclosed for automatically providing the appropriate amount of vacuum for purposes of milking a cow throughout the entire milking operation. The milking apparatus includes a fluid control valve system having a controller unit and a discharge valve in fluid communication with a collection jar. The controller unit is further adapted for communication with a source of vacuum, and the collection jar is adapted to be in communication with the cow such that the vacuum can draw milk from the cow into the collection jar. The discharge valve is further adapted for communication with a source of vacuum for drawing the milk through the discharge valve.

Abstract: A liquid isolator to prevent cross-contamination in the supply of liquid to and between animal racks. The isolator comprises cylindrical concentric tubes arranged to form a liquid storage chamber, a standpipe in the chamber, and a liquid entry tube within the standpipe. Near their upper ends, a liquid transfer port is provided between the standpipe chamber and the liquid storage chamber. An air lock is formed between the liquid transfer port and the level of any liquid in the storage chamber. The air lock isolates liquid in the standpipe chamber from the liquid in the storage chamber. Check valves are also provided in a liquid inlet at the top of the isolator and a liquid outlet at the bottom of the isolator, thus to prevent back flow through the isolator.

Abstract: A chemical feeder comprising a container having an internal divider for developing an upper compartment for supporting a supply of treatment chemical and a lower compartment for receiving the liquid solvent with orifices in said divider for permitting the liquid to rise upwardly for dissolution of the treatment material. First and second weirs of different heights are provided in said container for controlling the level of liquid in the upper compartment and, hence, the concentration of the solution formed with control means for permitting optional usage of said weirs. A housing retaining a float valve supportingly receives the lower portion of said container and is in communication therewith for accepting the formed solution; there being a discharge outlet in said housing controlled by a needle valve integral with said float valve. Control for the level of liquid in said container is provided.

Abstract: This invention relates to an improved concrete pumping apparatus, in particular of the truck-mounted type and adapted to operate at low environmental temperatures.Said apparatus comprises means which define an essentially closed circuit for circulation of the cooling air of the auxiliary engine controlling the pumping group in heat exchange contact with apparatus components disposed in separate bays to be maintained within well defined temperature ranges above the temperature of the environment, and means for independently adjusting and maintaining the air temperature in each bay. The engine exhaust gases are used to preheat the casting tube.

Abstract: Apparatus for continuously measuring and correcting for fuel density in an ircraft engine fuel metering system. Fuel, sampled at the inlet to the engine metering valve, is fed through a flow regulator to a vortex spin chamber in which the fuel is tangentially injected. A magnetic ball carried by the fuel in a race integral with the vortex chamber generates an electrical pulse in an electromagnetic coil at a frequency proportional to the tangential velocity of the fuel. The pulse frequency is compared to a reference frequency and the error signal modulates the regulator to maintain the tangential velocity constant. The radial static differential pressure of the chamber is directly proportional to the fuel density. This signal provides a compensating signal to the fuel metering valve for correcting the mass flow rate of the fuel based on a known true volumetric flow rate.

Abstract: A relief and make-up valve assembly is connected to first and second fluid pressure passages in a fluid pressure device. The valve assembly includes a housing of a hollow cylindrical form which communicates with the passages, a valve axially movable in the housing, a piston partitioning the interior of the housing into a low pressure chamber and a back pressure chamber, and a plunger biased by the piston against the valve to move the valve to an opened position away from a valve seat. The valve assembly controls the level of pressure in the first pressure passage by unseating the valve to relieve a preselected pressure from the first pressure passage or alternately to build up a pressure therein.

Abstract: A load responsive flow control valve for use in a system controlling a plurality of loads. The system is powered by a single fixed displacement pump equipped with a load responsive bypass valve or by a variable displacement pump equipped with a load responsive control, which during simultaneous control of multiple loads automatically maintains the pump discharge pressure at a level higher than the pressure required by the largest load being controlled. To transmit to the pump control signal of the highest system load, without creating a back flow, load sensing passages of individual valve spools contain check valves. Upstream of the check valves load sensing passages of individual spools are vented to reservoir with valve spools in neutral position, to prevent accumulation of leakage pressure affecting the pump control and to permit the use of priority type control with selected valve spools.

Abstract: A pneumatic valve for controlling the inflation of floatation bladders in ver-deployed underwater recovery apparatus comprises, in one embodiment, an inlet connectable to a source of pressurized air, two small semi-circular flow passages joining the inlet to an outlet which connects to the bladders, a pair of spring-biased control pistons mounted in parallel in the two flow passages and another spring-biased outlet piston in a larger outlet passage positioned between the flow passages and the outlet. Air flow allowed by either of the control pistons impinges on an end of the outlet piston, displacing it from a normally closed to an open position to permit air flow through the larger outlet passage.

Abstract: A servo valve controls the rate and direction of flow of a hydraulic fluid from a fluid power system to impart reciprocating motion to the piston of a hydraulically driven motor. An outer sleeve member of the servo valve has entry and exit ports connected to the source of fluid power and motor control ports connected to the hydraulically driven motor. A slider member is positioned within a cylindrical opening through the sleeve member and includes fluid chambers within the slider for alternating the direction of fluid flowing to the hydraulically driven motor by rotating the slider member. The rate of fluid flow is controlled by the lateral movement of the slider within the sleeve member.

Abstract: A wet seal standpipe cap to eliminate standpipe cap leakage includes a generally circular cap which has affixed to the underside of the cap a plurality of baffle rings. The cap is sized to enclose an opening in the top of a standpipe, and permit one of the baffle rings to penetrate a liquor contained in a canal placed around the standpipe opening providing a wet seal. The cap, in cooperation with the canal, entraps any leakage from around the standpipe opening between one of the baffle rings, underside of the cap and contained liquor.

Abstract: Disclosed are saddles for retaining a number of ducts in rectangular bundles. Each saddle in cross section is four-sided. Each side is concave and of the same radius as the ducts being bundled.

Abstract: A conduit used to convey particulate matter in which erosion is substantially diminished. A liner placed within the outer wall of the conduit is of ceramic material which is highly resistant to erosion.

Abstract: The invention provides a protective sleeve for drill pipes used for the drilling of deep wells in the ground for the recovery of oil, natural gas or similar, this protective sleeve being attachable in the connection area of the individual drill pipe rods and comprising a resilient inner part in the form of a ring part and a protective covering of a flexible and/or elastic material surrounding this inner part, characterized by this protective sleeve comprising two half shells with tension claws on the inside and spring segments on the outside adapted to be, joined together in a hinge-like fashion to form a closed ring.

Abstract: A liquid dispensing nozzle has a spout formed of inner and outer concentric cylindrical tubes. Liquid is dispensed from the nozzle through the inner tube to a tank to be filled. Vapors within the tank are returned through an annular passage, which is between the inner and outer tubes, to vapor recovery means by a vacuum pump. The vacuum pump exerts a sufficient suction to pull not only the vapors within the tank but also some air from the atmosphere through the fill pipe in which the spout is inserted so as to insure that no vapor escapes to the atmosphere.

Abstract: A pipetting system for dispensing multiple liquids into a single receptacle includes a plurality of liquid reservoirs, a plurality of syringes for aspirating preselected quantities of liquids from the reservoirs, and a common dispensing head connected to all the syringes for simultaneously receiving the preselected quantities of liquids from a plurality of the syringes and simultaneously dispensing the liquids into the reservoir. The system also includes means for simultaneously aspirating the preselected quantities of liquids from the reservoirs into the syringes. In addition, the system includes aspirating means for withdrawing a liquid sample from a container into the dispensing head at an aspirating position, means for storing the aspirated sample while the dispensing head is moved from the aspirating position to a dispensing position, and means for dispensing the aspirated sample to the dispensing head simultaneously with the dispensing of the preselected quantities of other liquids.

Abstract: A power screwdriver for use with a flexible string of disconnected screws retained in head to tip orientation by attachment to a continuous length of plastic, paper or similar flexible material. The string of screws feeds into a rearward section of a reciprocating shaft of the power screwdriver where the screws are individually advanced into alignment with an engaging bit, the combination bit and shaft being continuously rotated during the course of use. As the forward screw is prepared for engagement by the rotating bit, the retaining plastic or similar material is severed, leaving the forward screw free for emplacement. The screw is engaged and advanced to a forward opening of the shaft by thrust pressure applied by the user to reciprocate the shaft rearward with respect to a power train which is keyed to continuously rotate the shaft and bit. When the thrust pressure is withdrawn, a spring compressed by the rearward motion of the shaft returns the shaft forward to a stable position.

Abstract: A log splitter includes vertical support means, which is preferably pivotally mounted on the ends of a three point tractor hitch, having a pivotally mounted support adjacent its bottom for supporting the bottom of a log to be split. The pivotally mounted support is attached to a tractor drawbar in one embodiment. A splitting wedge is mounted on the upper end of the vertical support means and retained against upward movement by spring biased pawls engaging ratchet tracks on the vertical support means. When the vertical support means is lifted by the tractor hitch, the pivotally mounted support raises the bottom of the log relative to the vertical support means so that the log is driven into the wedge and split. When upward movement of the vertical support means by the tractor hitch has been completed, the vertical support means is returned to its start position. During this downward movement, the wedge remains wedged in the log and the pawls enable downward movement of the wedge with the log.

Abstract: An axe comprising a blade formed of flat plate stock of generally uniform thickness, and a U-shaped handle attaching strap formed of flat plate stock of generally uniform thickness, the strap is fixedly mounted on a handle end portion with the bight portion and leg portions thereof substantially circumferentially surrounding the handle end portion and free end portions thereof extending therefrom in generally parallel relation beyond a leading edge of the handle end portion. The blade is rigidly mounted with its attaching portion disposed between the free end portions of the attaching strap and a trailing edge thereof facing the leading edge of the handle portion. The cutting edge of the blade is of uniform wedge-shaped cross-sectional configuration throughout its extent, the wedge shape being formed by generally straight bevel surfaces.

Abstract: A method of dislodging a pneumatic tire from its bead seat of a wheel rim on which it is fitted, by applying a force to the tire, said force having been generated by the detonation of an explosive charge.

Abstract: A folding partition comprising a plurality of folding panels hinged to each other and slidably suspended from a ceiling. A control plate is fixed adjacent the hinged folding panels and includes a plurality of first and second stops which extend therefrom. Every other folding panel includes a control member extending therefrom with each control member engageable with one of the first stops as the folding partition is folded to cause two adjacent folding panels to pivot about their connecting hinges. Each control member is abuttable against each second stop as the folding partition is opened to pivot adjacent said folding panels in an opposite direction. Each control member is connected to each associated folding panel at a different vertical location and each first and second stop associated with each control member is located at a different horizontal location on the control plate corresponding to the horizontal positions of their associated control members.

Abstract: A venetian blind construction for the operation of blind slats which are interconnected by supporting elements comprises a housing with a sprocket wheel rotatably mounted in the housing. A sprocket chain defines a tension member for the blind slats and it has one end adapted to be connected to the lowermost slat and it is engaged over the sprocket wheel and is movable by the driving movement of the sprocket wheel to adjust the blind slats. The housing has first and second chain-guiding passage portions and a sprocket portion overlying the sprocket which effect the guidance of the chain toward and away from the sprocket and around the sprocket without permitting any buckling-out of the chain in its movement path.

Abstract: Mold forming apparatus including a pattern device which is composed of pattern plates adapted to be operatively fitted into a pattern plate carrier is operated with the pattern device shifted between a lifting station, at which a formed mold may be removed from the patterns of the pattern plates, and an exchange station where the pattern plates may be separated from the pattern plate carrier for appropriate treatment thereof. The pattern plate carrier is formed in a generally box-like configuration with a bottom member having openings extending therethrough through which extraction pins of a lifting device may extend in order to raise and lower the pattern plates from the pattern plate carrier at the exchange station. A vacuum system is provided which will tend to hold the pattern plate carrier upon a bearing member of the apparatus and which will also tend to hold the pattern plate upon the pattern plate carrier while the finished mold is removed therefrom.

Abstract: A thermal energy storage apparatus and method employs a container formed of soda lime glass and having a smooth, defect-free inner wall. The container is filled substantially with a material that can be supercooled to a temperature greater than 5.degree. F., such as ethylene carbonate, benzophenone, phenyl sulfoxide, Di-2-pyridyl ketone, phenyl ether, diphenylmethane, ethylene trithiocarbonate, diphenyl carbonate, diphenylamine, 2-benzoylpyridine, 3-benzoylpyridine, 4-benzoylpyridine, 4-methylbenzophenone, 4-bromobenzophenone, phenyl salicylate, diphenylcyclopropenone, benzyl sulfoxide, 4-methoxy-4PR-methylbenzophenone, N-benzoylpiperidine, 3,3PR,4,4PR,5 pentamethoxybenzophenone, 4,4'-Bis-(dimethylamino)-benzophenone, diphenylboron bromide, benzalphthalide, benzophenone oxime, azobenzene. A nucleating means such as a seed crystal, a cold finger or pointed member is movable into the supercoolable material. A heating element heats the supercoolable material above the melting temperature to store heat.

Abstract: This invention relates to an improved method for freezing red blood cells, ther living cells, or tissues with improved subsequent survival, wherein constant-volume freezing is utilized that results in significantly improved survival compared with constant-pressure freezing; optimization is attainable through the use of different vessel geometries, cooling baths and warming baths, and sample concentrations.

Abstract: An electronic means to cyclically control the heat or air conditioning source in an environmental temperature control system so that the heat exchange surfaces are maintained within a predetermined range to maximize heat exchange efficiency and minimize total operating time of the heat or cooling source. The apparatus incorporates a temperature responsive transducer which provides a voltage level that is compared to an analog representation of a controllable, periodic output of a digital counter to produce a signal for selectively energizing the heat or cooling source of the environmental temperature control system for a time period proportional to heat demand but limited to relatively short durations of time so as to minimize or limit the temperature of the heat exchange surface during temperature modification demand periods.

Abstract: A multistage gas generator for use in a borehole for recovering hydrocarbons from the subsurface formations. The gas generator has an upper end and a lower restricted outlet. A pilot stage is located at the upper end and a plurality of spaced apart intermediate stages are located between the pilot stage and the lower restricted outlet. Hydrogen and oxygen are fed to the pilot stage for ignition. Oxygen is fed to a first intermediate stage and hydrogen and oxygen are fed to each of the other intermediate stages for injection into the gas generator. Excess hydrogen from the pilot stage is burned in the zone of the first intermediate stage and hydrogen and oxygen of each succeeding stage is ignited by the preceeding stage. Water for cooling purposes also is fed to each intermediate stage. Downhole valves selectively controllable from the surface are provided for the pilot stage and each of the intermediate stages.

Abstract: In one exemplar embodiment, method and apparatus include providing an electrode disposed in a plurality of insulated, spaced boreholes penetrating the oil formation. The plurality of electrodes in contact with a water electrolyte in the formation are connected to a source of AC electrical power for establishing a current flow between the spaced electrodes and through the oil bearing formation by means of the electrolyte. The electrodes are insulated from the earth structure surrounding the boreholes for preventing an electrical current path between the electrodes and the earth structure for isolating the electrical current path between the electrodes and the formation. When the AC current passing through the formation surpasses a minimum current density, AC disassociaton of the H.sub.

Abstract: Disclosed is a method for detecting the flame front during the in situ combustion of a subterranean carbonaceous stratum which involves providing one or more radio transmitters below the surface of the ground, each of said transmitters being capable of sensing and transmitting information concerning the physical and chemical properties of its surroundings, and monitoring said transmissions as an indication of the extent and movement of said flame front. Also disclosed is a method for detecting non-uniform packing characteristics of rubblized material which involves providing one or more radio transmitters within the boundaries of a retort capable of sensing and transmitting information concerning the physical parameters of its surroundings, and monitoring said transmissions as an indication of the size and density distributions of the rubble in said retort.

Abstract: A thickener and surfactant for a driving fluid used in enhanced oil recovery comprises a salt of a sulphated polyoxyethylene alcohol in which at least 40 wt % of the alcohol portion of the sulphated polyoxyethylene alcohol is a C.sub.8 to C.sub.20 primary alcohol having a C.sub.1 to C.sub.3 alkyl substituent in the 2-position of an otherwise linear chain. The balance of the alcohol portion may be made up of a linear primary alcohol of same carbon number as the 2-alkyl branched alcohol.

Abstract: Geopressurized gas (methane) containing aquifers are produced into relatively low pressure reservoirs such as depleted or partially depleted oil and gas reservoirs. Primary production of the methane in the water is effected by exsolvation upon entering the low pressure reservoir and movement through the reservoir to production walls. Enhanced recovery of hydrocarbons remaining in depleted or partially depleted reservoirs results from one or more of (1) the sweeping action of the methane moving through the reservoir, (2) pressure maintenance and water drive associated with injection of the naturally pressured water, and (3) reservoir heating caused by the higher temperature of the injected geopressured water.

Abstract: A fire protection system of the type having a plurality of electrically activatable, parallel coupled fire suppressant units each having a bridge wire type initiating element, produces significantly improved reliability by providing each of the units with an electrically active portion for continuously monitoring the electrical continuity of the associated bridge wire and a discrete capacitive portion for storing an independent, electrical supply of the actuating power therefor, thereby eliminating the dependency of the units on a single, central electrical power supply source while also allowing continuity monitoring of each bridge wire, even though the latter are continuously coupled in parallel relationship with each other.

Abstract: A soil working implement for use in forming a raised soil bed is disclosed. The implement includes a carriage assembly and a plowing tool mounted for rotation on the carriage assembly. The plowing tool includes a cylindrical rim and an array of soil digging teeth rigidly secured to the rim and projecting radially with respect thereto for moving soil laterally relative to the line of travel of the implement. Each tooth is characterized by an inclined face slanting away from the direction of rotation of the rim and converging to form a cutting edge which is canted at an oblique angle with respect to the line of travel.

Abstract: A cultivating machine has a row of soil working members rotatable about upwardly extending axes and each member includes a carrier from which tools detachably depend. The lower tool ends have blades that are adjustable and detachable from the remainder of the tools. The blades are normally faced in the direction of rotation of the respective soil working member. The widest portions of the tools are substantially tangential to an imaginary circle centered on their axis of rotation.

Abstract: An apparatus for measuring and controlling a force such as torque, pull or weight. One example is an apparatus for making up two members having mating threaded connections, such as pipe joints, head bolts and all types of threaded fasteners for insuring that a specified torque has been applied. A comparator compares the measured torque with a desired torque value and disengages the making up of the joint when the measured torque exceeds the selected torque. A testing circuit is provided for applying a test value for testing the operation of the apparatus in the absence of actual measured torque. An adjustment circuit adjusts the output to conform with a known test value. An adjustment is provided to compensate for the length of the torque arm at which the torque measurement is made.

Abstract: Augering apparatus is intended for attachment as an accessory to a hydraulically operated boom of a backhoe or the like, the boom having articulated first and second members, the first member being pivotally attached to a tractor and the second member of the boom having a distal end hydraulically positionable in azimuth, elevation and reach from the tractor, and points of attachment for a scoop or the like. Such scoop is replaced by the accessory which includes a mounting bracket for being carried by transverse pins normally present at the end of the boom for mounting the scoop. The bracket carries a yoke in swiveling relationship for movement about a swivel axis lying in the plane of articulation of the boom members, the yoke having first and second oppositely disposed pivot members. A motor enclosure has pivot cooperative members, preferably trunions extending from opposite sides thereof, for pivotally cooperating with the yoke. The enclosure contains a selectively reversible hydraulic motor.

Abstract: A method of perforating the sub-surface formation located in the area of an oil or gas well bore hole comprising directing a high powered coherent light beam axially along the bore hole to a predetermined depth therein from a surface location, deflecting the beam at said depth along a deflected beam axis, and successively focusing the beam at said depth to concentrate the beam at each of a plurality of spaced focal points along the deflected beam axis. The method (1) provides a significant increase in the distance (length) to which the calculated oil or gas bearing formations can be perforated (from a present nominal 18 inches to 200 feet or more), thus providing the opportunity for increased yield; and (2) provides an accurate determination of the exact near horizontal plane orientation of such perforations so that each can be aimed in the direction of the most promising formation pay zone.

Abstract: An apparatus for rock cutting and drilling. A preferred embodiment of the apparatus is a drill bit comprised of composite compact cutters removably secured or attached to the drill crown. The cutter is preferably comprised of a stud or pin with an abrasive composite compact bonded at one end of the stud. The securing means for the cutter is comprised of a sleeve and a bushing fixed in the recess of the bit crown. The sleeve has a threaded outer wall for engagement with a threaded inner wall of the bushing. The height of the cutter is adjustable by the provision of metal shims between the bottom of the recess and the base of the stud of the cutter.

Abstract: A collapsible portable manual wheel chair is converted to a collapsible electric wheel chair. The two large rear wheels of the collapsible manual wheel chair are removed, and an electromechanical drive unit is substituted in their place. The drive unit includes a left drive wheel assembly, a right drive wheel assembly, a battery mounting assembly, and a control device supplying electric power to each of the drive wheel assemblies for propelling and steering the wheel chair. The left and right drive wheel assemblies and the battery carrier assembly are each manually removable from the wheel chair frame to permit collapsing the wheel chair frame and are each manually removable from one another to provide portable light weight components.

Abstract: An electrically-powered vehicle having a combination automobile frame and trailer, which are driven by a pair of electric motors located on the automobile frame. A battery is also located on the automobile frame, and a generator, along with a gas turbine for driving the generator, are located on the trailer. The vehicle can be operated with the trailer attached and the electric motors powered by a parallel combination of the battery and generator, or with the trailer removed and the motors powered by the battery alone. A controller turns on the gas turbine when the charge level in the battery drops below a first predetermined level and turns off the turbine when the charge level rises above a second predetermined level. Additionally, when the gas turbine is operating, its speed is maintained at a constant level, thereby maximizing its operating efficiency and yielding a minimum level of exhaust pollution.

Abstract: A steering gear with steering drop arm, steering tie rod and steering gear connecting tie rod for a vehicle, which is drivable on wheels on the road and terrain, with a steering mechanism which is actuated selectively hydraulically supported mechanically or purely hydraulically by means of hydraulic cylinders and electromagnetic valves, whereby changing from the hydraulically supported system to the purely hydraulically operating system is by means of a selective connection of a universal shaft, which is connected with the steering wheel, with one of the two systems which serve the actuation of the steering mechanism. A hydraulic pump, driven by a drive motor, and acting on both systems, is connected with a first control valve via a line, a flow control- and pressure limit- valve and a line. On the one hand a line leads from the first control valve to a steering transmission, the latter being actuated by the steering gear by means of universal shaft.