Abstract: An aspirating horizontal mixer for aerating and liquid mixing includes a float with tiltable supports extending downwardly into a body of water and an air delivery conduit which are connected to a mixer unit supported below the liquid surface by the supports and tiltable therewith. The mixer unit includes a submersible motor powering a propeller and a nozzle member situated in the flow path of liquid from the propeller. The nozzle member has an internal venturi for mixing air from the air delivery conduit with the liquid flowing therethrough and includes a converging wall formation forming a constriction and a diverging wall formation leading downstream and merging with the interior wall of the nozzle member. An air injection port extends through the diverging wall formation adjacent the constriction and is in communication with the air delivery conduit for mixing air with the liquid as it flows through the venturi.

Abstract: A grinding machine is provided with a workhead support means having pivotable shaft means on which the support means is pivoted by a servomotor/pinion arrangement controlled by a programmable controller and a position indicating means on the pivotable shaft means that inputs angular shaft position signals to the controller. Adaptive control components may also be included in the control arrangement. The workhead support means is thereby pivotable to vary the angular relationship of the workpart axis to the grinding wheel axis to effect a desired taper or contour grind or to compensate for changes in grinding parameters causing out of tolerance ground workparts. Special releasable clamps are provided to fix a desired position of the workhead support means and yet release same for pivoting movement. Fluid lift mechanisms are also provided to reduce friction between the workhead support means and the adjacent machine base member during pivoting.

Abstract: An adjustable over-the-top agitator for a liquid manure tank. To periodically break up the crust on liquid manure stored in an open top tank, the liquid manure is withdrawn from the bottom of the tank and is discharged through a nozzle on the end of an external delivery pipe into contact with the crust. The upper end of the delivery pipe is connected by a swivel coupling to a vertical end of a connecting pipe, while the opposite horizontal end of the connecting pipe is connected by a second swivel coupling to the discharge nozzle. By rotating the connecting pipe about the axis of the delivery pipe, the nozzle can be moved in a horizontal path, while swiveling the discharge nozzle about the horizontal end of the connecting pipe moves the nozzle in a vertical arc. A torsion spring is associated with the second swivel coupling to bias the discharge nozzle to a horizontal position.

Abstract: An apparatus for preventing free descent of a motor-pump unit. The motor-pump unit is mounted within a manure-containing pit for vertical sliding movement on a fixed column, and an elevating mechanism is employed for raising and lowering the pump within the pit and includes a cable having one end which is coiled on a drum while the opposite end of the cable is connected to the motor-pump unit. The weight of the motor-pump unit normally applies substantial tension to the cable. A mechanism is incorporated which is responsive to slackening of the cable and acts to arrest free descent of the motor-pump unit, as well as discontinuing operation of the cable drum mechanism.

Abstract: An amphibious vehicle has an engine and a drive train connected to drive wheels with tires having a tread configuration that produces a water propulsion effect when the vehicle is driven through water. An auxiliary propulsion unit is selectively positioned in driving relationship to each of the wheels to improve water speed of the vehicle. The propulsion unit includes a gear box with its input connected to the wheel hub; its output connected to a propeller and an anti-torque strut is pivotally connected to the gear box and anchored to the vehicle hull whereby the propeller speed is increased by the gear box a desired amount as compared to axle speed to rotate the propeller at a speed to propel the amphibious vehicle.

Abstract: A controller for a water heater having a plurality of individual electrical heating elements changes the number of energized elements to maintain a predetermined minimum temperature. The number of "on" elements is related to the difference between sensed water temperature and a preset water temperature divided by a dead band factor. The heating elements are turned "on" and "off" in a programmed sequence whenever a change is required to optimize the equalization of operating time of the elements. The controller includes a microprocessor which monitors turn "on" or "off" of each element to continuously develop the "on" operational period of each element in relationship to all of the other heating elements since system initialization. The operation period is made relative to the load with the shortest period by substracting the lowest "on" time from all other loads so as to reduce the required memory size.

Abstract: A signature analyzer for testing digital circuits. The analyzer includes a memory which is initially programmed with a set of signatures characterizing the digital signals on the nodes of a correctly operating circuit. The nodes of a test circuit are then sequentially applied to a signature generator formed by a multi-stage shift register having the outputs of selected stages fed back to a gate to which the digital signal is applied. The signature generated by the shift register is compared to each of the signatures stored in memory until a signature match is found, thus indicating that the digital circuit, at least as far as the test node is concerned, is operating correctly. The signature generated by the shift register consists of twenty-four bits to provide a probability of error which is comparable to the probability of error in comparing a sixteen-bit signature with the signature from a specifically identified node.

Abstract: A boring tool is disclosed capable of positioning a tool element between a radial cutting position and a radial retracted position out of contact with the finished workpiece bore to avoid tool mark formation on the finished bore during tool withdrawal. The boring tool is simple and low cost in construction and includes a resilient tool-carrying member which extends transversely of the spindle axis in cantilever fashion for deflection by a spindle draw bar relative to a stop means on a fixed support member attachable to the spindle. During boring, the tool-carrying member is in deflecting engagement with the drawbar and, in conjunction with stop means, positions the tool thereon in a radial cutting position. For tool withdrawal, deflecting engagement is released so that the resiliency of the tool-carrying member positions the tool in a radial retracted position out of contact with the finished workpiece bore.

Abstract: There is disclosed a coaxial lightning arresting structure comprising an inner conductor, an outer conductor surrounding the inner conductor and an arrester tube located between the inner and outer conductors perpendicularly to the direction of transmission and connected at its ends to the inner and outer conductors, respectively. The portion of the inner conductor provided with the arrester tube has a reduced effective sectional area as compared with the other portions of the inner conductor so that the ratio of the outer conductor inner diameter to the outer diameter of the inner conductor portion having the reduced effective sectional area is greater than the ratio of the outer conductor inner diameter to the inner conductor outer diameter at the other portions of the inner conductor which latter ratio provides the coaxial transmission line with a given characteristic impedance.

Abstract: Disclosed are invert oil emulsion drilling fluids containing a non-toxic, biodegradable oil having a viscosity at 25.degree. C. of less than 1.5 centipoise, a flash point of at least 60.degree. C., an aniline point of at least 80.degree. C., and a content of aromatic hydrocarbons of less than 1% by volume. These drilling fluids have a low viscosity at the high shear rates imparted to a drilling fluid at the bit during drilling. This low bit viscosity provides for faster penetration rates. Such drilling fluids containing a temperature stabilizing additive exhibit superior thermal stability.

Abstract: An axial flux induction electric motor and method and apparatus for the production thereof, said motor having a rotor and stator, each formed of a core consisting of metal strip having holes punched therein at longitudinally spaced locations so that holes on the core form radially extending slots on a radial face of the core, and wherein said core has the radially inner coils and the radially outer two coils fixed together by deformations thereby preventing unwinding of the core.

Abstract: A semiautomatic shotgun having a gas operating mechanism for unlocking a bolt and moving it from battery position. The operating mechanism includes an action bar and an inertia weight assembly which comprises a plurality of inertia elements. The inertia elements, the action bar and the bolt are arranged for movement relative to each other and impact at different times during the operating cycle. A return spring cooperates with the inertia weight assembly to maintain the various parts of the mechanism in fixed position relative to each other when the bolt is locked in battery.

Abstract: Mechanical fastener means for blocking off an opening in an intake manifold gasket when the latter is used with a fuel injected engine. The fastener means includes two mating metal members whose outer edges are oppositely bowed to extend past and confine the oppositely disposed edge portions of the gasket opening therebetween, with one of the members having a central opening formed therein for receiving a "button" extension in the shape of a substantially cylindrical cup formed on the other member and, once extended through the central opening, such button extension being mechanically impacted to be caused to assume a dished shape and a flanged connection with the edge portion of the central opening in the one member.

Abstract: An air flow device for a closed motor vehicle or boat for positioning in the rear aperture thereof which includes structure for attaching the air flow device to the rear aperture. There is a plate which is transparent in at least the central region thereof. The attachment structure, which includes a pivot means, is pivotally attached to the bottom portion of the plate and to the lower rim of the aperture. There are two vertical side members, each of which is attached to an end of the plate so as to extend outwardly from the plate. Each of the vertical side members is in sliding relationship with one of the vertical sides of the rear aperture and/or of window glass mounted therein. There are two narrow end members, each of which is attached to an unoccupied end of one of the vertical side members and extends away from the plate. When the plate is in an upright position so as to close the rear aperture, the vertical side members extend outwardly from the rear aperture of the vehicle.

Abstract: Electrically energized coffee or tea brewing machine of the type including a hot water reservoir and from which the reservoir and its associated components can be readily removed as a unit for servicing by removing the housing cover and then making easy mechanical and electrical disconnections.

Abstract: A heated sealing tool is actuated intermittently for fixed intervals of time to engage thermoplastic envelopes of successive cigarette packs which are supported by an indexible turret. In order to ensure that the intervals of engagement between the tool and successive envelopes are not altered when the speed of the prime mover of the packing machine is changed, the tool is mounted on one arm of a two-armed lever the other arm of which carries roller followers for two discrete coaxial cams which jointly actuate the tool through the medium of the lever. Each of the cams is driven at a speed which is proportional to the speed of the prime mover; however, one of the cams is angularly adjustable relative to the other cam by a gear motor or a bevel gear transmission in response to signals which denote changes in the speed of the prime mover so that the duration of intervals of engagement remains unchanged.

Abstract: A thread cutting tool having an electric motor which is accommodated in a housing and, by means of at least one worm gearing, drives a holder ring which is rotatably mounted in a head ring. The electric motor has a speed of greater than 25,000 rpm. The worm-gear toothing of the holder ring has a modulus of less than approximately 1.6 mm. Due to the high speed, the electric motor can be very small, so that the thread cutting tool can be easily handled, and can have a low weight. Due to the low modulus, the high speed of the electric motor can be reduced to the operating speed of the holder ring without it being necessary that the worm gear have a large diameter.

Abstract: A laser echoe ranging device (lidar) is used both to measure cloud height and to measure slant range visibility. For the latter purpose at various elevation angles, the distance for which the echoe gets down to the noise level is measured by a counter and the echo voltage for a distance selected by a time switch is also stored, for example for various distances in 100 meter steps. These values can be used to compute the slant visual range and, with reference to the data for the different angles of elevation, also the layer structure of an inhomogeneous scattering characteristic of the atmosphere.

Abstract: A grinding machine wherein the grinding wheel has a profile consisting of recurrent identical sections, as considered in the axial direction of the grinding wheel. The profile of the grinding wheel is treated by a dressing tool whose profile is that of a worm and is complementary to the profile of the grinding wheel. The axial length of the dressing tool equals that of one section of the profile of the grinding wheel and the axes of the grinding wheel and dressing tool make an angle which matches the lead angle of the worm-like profile of the tool. A feed screw is used to move the dressing tool in parallelism with the axis of the grinding wheel at a rate such that axial displacement of the tool per revolution of its shaft equals the axial length of one section of the profile of the grinding wheel. The grinding wheel is used to convert blanks into toothed racks.

Abstract: A device, particularly for use with guided missiles, of a type having an intake pipe which is not fully rotationally symmetrical and is particularly semi-rotationally symmetrical, having particularly a semi-rotationally symmetrical air intake cross-section. The device prevents hum in the supersonic intakes of air-breathing reaction engines, particularly, ram jet engines, of a type which are operated with solid fuels and without regulation of the amount of air intake, the amount of fuel or the amount of thrust current flow for driving guided missiles. The construction includes a missile body having an intake pipe mounted thereon with a front opening disposed in an opening plane defining an inlet. A displacement body is mounted within the pipe in spaced relationship thereto and has a front pointed end which extends outwardly beyond the intake plane and which projects into the incoming air flow.