Abstract: An automotive step-turbine engine comprising in combination a primary power turbine assembly, one or more power boost turbine assemblies and a power output demand sensor for sequentially placing in service the one or more power boost assemblies as additional power output above that capable of being economically produced by the primary power turbine assembly is required further sequentially taking the power boost turbine assemblies out of service in reverse order when the additional power is no longer required. The primary power turbine assembly and the power boost turbine assemblies are geared together synchronously and run at the same velocity. The assemblies each have an air compressor unit geared directly to the respective assembly for pumping air into burner units, one for each of the assemblies.

Abstract: A gas turbine power plant has a compressor stage and a turbine stage with an annular combustion stage therebetween. Each of the contra-rotatable compressor rotors is connected to one of the contra-rotatable turbine rotors by an elongated hollow cylindrical shaft concentric with an axially extending fixed shaft to form an integral unit. The units are operably connected by differential gearing mounted on the fixed shaft just in rear of the nose of the engine at the air intake end of the housing.

Abstract: Increased thrust during the transonic flight mode of an aircraft powered by a gas turbine engine is realized by a closed loop control that closes the loop on the pressure ratio across the fan by adjusting fuel flow and/or exhaust nozzle area in a turbofan, variable exhaust nozzle installation. Fan pressure ratio is scheduled as a function of corrected fan speed and actual pressure ratio provides an error signal to readjust engine operation to null out this error signal. A turbine inlet temperature limit signal is generated to prevent inadvertent overheating and it or this pressure ratio error signal is selected for providing the lower fuel flow value.

Abstract: Disclosed is a secondary air control device disposed in a system for supplying secondary air into an exhaust system of an internal combustion engine for purifying exhaust gas emitted from the engine. The secondary air control device comprises a first valve device actuated by an ON-OFF vacuum signal for stepwisely controlling the flow of secondary air in response to the ON-OFF vacuum signal, and; a second valve device, which is a delay system with a predetermined delay time, actuated by the ON-OFF vacuum signal for controlling the flow of secondary air. Accordingly, the secondary air control device can control the flow of secondary air, which comprises a step flow generated by the first valve device, and a delayed flow generated by the second valve device, in accordance with the ON-OFF vacuum signal.

Abstract: An exhaust pipe for connecting an exhaust gas outlet of each of a plurality of in-line cylinders of a turbo-supercharged internal combustion engine to a turbine of an exhaust gas turbo-supercharger. The exhaust pipe comprises four separate pipe strings having parallel axes located at the corners of a substantially equal-sided quadrilateral, a branch pipe for connecting the exhaust-gas outlet of each cylinder to the pipe strings, each branch pipe leading to one of the two corners of one side of the quadrilateral, and a connecting part provided in the pipe strings, said connecting part being arranged to twist the pipe strings whereby the parallel portions of an upstream part of the pipe strings and associated with that side of the quadrilateral remote from said one side communicate with the parallel portions of a downstream part of the pipe strings and associated with said one side of the quadrilateral.

Abstract: A first ring member coaxially and firmly mounted on a circular open end of a first housing equipped with an impeller. A second ring member is coaxially mounted on a small diameter cylindrical section formed in a circular open end of a second housing which is firmly connected to an engine driven shaft, the circular open end of the second housing being further formed at the leading end portion thereof with a large diameter cylindrical section which is snugly disposed in the circular open end. An O-ring is sealingly disposed between the large diameter cylindrical section and the circular open end of the first housing. Fastening bolts are passed through aligned holes formed in the first and second ring members to combine the first and second housings.

Abstract: Solar energy is collected by an array of parallel trough-like reflectors of paraboloidal cross-section, and concentrated upon radiation-absorbent pipes positioned along the lines of focus of the reflectors. The array is mounted on a boat which floats on an irrigation pond of a farm and is rotated by a clock-like drive mechanism so as to follow or track the daily east-west motion of the sun, thereby maintaining the concentration of solar radiation upon the pipes. The flotation of the array by means of the boat permits the use of very low drive power for rotating it to track the sun, and also shields the underlying water from the air and sun so as to reduce evaporation thereof. A central column stabilizes the position of the boat with respect to lateral drift or angular tilt, while permitting vertical motion of the boat in response to changes in pond level; the array may therefor be protected from heavy wind by dropping the pond level so that the array is protected by the sidewalls of the pond at such times.

Abstract: An assembly such as for a tile chute tool for laying tile, plastic pipe or the like or for a crumbing tool either of which tools is adapted to be connected to the digging boom and mobile chassis of a ditching or trenching machine by a four-bar linkage. The linkage is connected to the boom by extensible arm means which can be fixed at one length to maintain the boom and tile chute tool in operable relation to each other for digging and tile laying or other tool function, or released to be telescopically extendible for the digging boom to proceed with digging with the tile chute tool remaining at ground level. A control member tiltable relative to the pivot axis of the digging boom connects to the linkage to alter the position of the tile chute tool bottom.

Abstract: An article of jewelry comprises a hollow spherical housing having upper and lower halves secured together, a disc having gauze-filled cutouts formed therein, internal annular flanges supporting the disc in the housing, and wicks extending between sections of gauze and into the lower half containing perfume. A plurality of orifices in the upper half permit the perfumed vapors to escape. In one embodiment, the disc has a gauze-filled central aperture, and the upper housing half has a central orifice and a coupling ring with an opening aligned with the central aperture and orifice through which a hypodermic needle is inserted to supply perfume to the lower housing half. In another embodiment, the central orifice in the upper housing half is threaded to receive a rod having a threaded portion and an end extending into the disc central aperture, which is devoid of gauze. Removal of the rod permits the lower half to be filled by an eyedropper.

Abstract: A unit for automatically cleaning items such as laundry or the like comprises a plurality of reciprocating plungers mounted to engage the items within a tank containing the items and a cleaning liquid. Each plunger comprises a piston mounted within a canister. The piston is mounted within the canister in an arrangement which permits a limited relative movement between the piston and canister, thus developing a bi-directional pumping action. With each stroke of the plunger, the piston forces liquid through the items to be cleaned, first in one direction and then the other, by virtue of the limited movement of the piston relative to the canister, the latter serving to assist in holding the items to be cleaned in a position for encountering the liquid being driven by the piston. The combined rotary reciprocating action of the plungers not only serves to clean the items in the tank but also to slowly propel them from the inlet to the outlet end of the tank so that a continuous cleaning process is performed.

Abstract: Improved metallic rod product which substantially reduces die wear in wire drawing operations, and which provides other advantages during manufacturing. The exterior surface of the rod product is intentionally provided with a predetermined rough texture having certain characteristics, rather than the smooth bright surface conventionally imparted to metallic rod product intended for subsequent drawing into wire. Certain textured surface characteristics of the rod product reduce wear on the first few wire drawing dies by entraining lubricant as the rod moves through the dies, and carry the entrained lubricant into the dies, while at the same time avoiding some common wire drawing defects such as flakes and slivers. The textured-surface rod thus reduces frictional wear of the drawing dies, so that less force is required to draw the rod product through the dies and the useful life of the drawing dies is increased.

Abstract: A toggle mechanism pinches a metal tube and maintains the tube in a pinched condition, without fracturing. The toggle mechanism includes a plunger translatable along a longitudinal axis, as well as a pair of links pivoted about a common axis extending through an end of the plunger. One of the links also pivots about a fixed axis. A free end of the other link carries a push link which the other link translates at right angles to the plunger longitudinal axis. First and second sides of the tube bear against a first stop block and are engaged by the push link when a compresson spring, attached to the plunger, is suddenly released to irreversibly drive the plunger along its longitudinal axis so the pivot point of the two links is driven to an over travel position. At over travel, the free end of the push link and the stop block abut against opposite sides of the tube to pinch them together.

Abstract: An isokinetic air sampler includes a filter, a holder for the filter, an air pump for drawing air through the filter at a fixed, predetermined rate, an inlet assembly for the sampler having an inlet opening therein of a size such that isokinetic air sampling is obtained at a particular wind speed, a closure for the inlet opening and means for simultaneously opening the closure and turning on the air pump when the wind speed is such that isokinetic air sampling is obtained. A system incorporating a plurality of such samplers provided with air pumps set to draw air through the filter at the same fixed, predetermined rate and having different inlet opening sizes for use at different wind speeds is included within the ambit of the present invention as is a method of sampling air to measure airborne concentrations of particulate pollutants as a function of wind speed.

Abstract: An apparatus for continuously monitoring clearances between a moving and a stationary machine part, utilizing compressible fluid flow. A measuring nozzle is disposed in the clearance space, and a conduit connects said nozzle with a space having a compressible fluid pressure different from the pressure in the clearance space. A measuring orifice is disposed along the conduit path. First and second comparison nozzles are situated in a pressure chamber and coupled through conduits to the same pressure space as that to which the conduit of the measuring nozzle is coupled. Measuring orifices are also situated in the conduits coupled to the comparison nozzles. Differential pressure meters are coupled between the conduit of the measuring nozzle and a conduit of one of the comparison nozzles; and between the conduits of the two comparison nozzles.

Abstract: A test tool and a method of testing is disclosed for testing for leaks in apparatus having a bore and a landing surface, such as blowout preventers, wellheads, casing hangers, and the like. The test tool is connected to pipe having a passage therethrough, which has a landing surface for landing on the landing surface of the bore, bypass passages automatically closed on landing and during testing, packing means for effecting a seal in the bore, a pressure relief valve and hydraulic passages communicating with the passage in the pipe, the packing means, and the relief valve which opens at a predetermined pressure. The packing is set either hydraulically, mechanically or by a combination thereof. The packing is set hydraulically by a piston and cylinder which are activated by hydraulic setting pressure in the passages and then hydraulic test pressure is released by the relief valve to the space above the packing for testing the apparatus.

Abstract: Detecting conditions related to the heat absorptive characteristics of a surrounding medium by heated thermistors exposed for heat transfer to the medium, and connected to a restorative energizing electronic circuit that supplies heating power. The restorative circuit responds to differences between the resistance of the sensing leg containing the thermistors and a reference value to vary the power flow through the leg and thus to restore the resistance of the leg toward the reference value. With two or more thermistors in the leg, the thermistors are heated in unison by the single energizing circuit, each thermistor is disposed in a different relationship to the conditions to be discriminated and differences between the individual thermistor resistances, reflecting differing rates of heat loss to the medium provide indications of the various conditions. When one thermistor is used, the power flow through the overall leg can serve as a measure of conditions of the surrounding medium.

Abstract: An apparatus and a method for determining pulp quality by monitoring the rate of descent of the pulp-water interface of a uniformly intermixed stationary sample of pulp suspension, at a selected consistency, while it settles out.

Abstract: An apparatus for measuring the consistency or hardness of a material, for example skin tissue on a living body, comprises a support to be applied against the material to be tested and a feeler movably carried by the support for displacement through a distance which will be proportional to the hardness or consistency being measured. To avoid the need for careful positioning of the device on the test material with a carefully constant bearing pressure, a control circuit is provided for recording the displacement of the feeler only when the bearing pressure of the support on the test material has a predetermined value. The reading of the displacement is held and is preferably digital. Application of the support successively to different points on the test material will enable a true comparison of the readings at the various points.

Abstract: A vibrating wire stress meter. The wire is highly tensioned diametrically across the sides of a hollow metallic cylinder and held there by two anchor tubes. A wedge and platen assembly in turn hold this cylinder in a rock borehole such that small stress changes in the surrounding rock cause the diameter of the cylinder to slightly change. This cylinder variation is transmitted to and measured by the preloaded wire by noting variations in its frequency or period of vibration. To cause the wire to vibrate a coil, magnet, and yoke are used as a plural pole electromagnetic plucker.Clamping of the wire is accomplished by highly tensioning the wire between two opposite hollow tubes that are seated in opposite aligned countersunk holes of the cylinder and then extruding the steel tubes around the wire. The wire extends through holes of those hollow tubes as well as the aligned holes in the cylinder walls which are diametrically opposite each other.

Abstract: The disclosure illustrates a closed loop aircraft transmission test set comprising a variable speed DC motor driving a speed changing gear box whose output shaft is coupled to the input of the transmission under test, the main output shaft of the transmission being coupled to a DC generator load, the output of the generator being used to supplement the input electric power used to operate the DC driving motor thus assuring power drain from the supply busses is only the amount needed to overcome system friction and efficiency losses.

Abstract: A method of and apparatus for measuring bottom hole pressure in the tubing of a well by installing an isolation assembly in the tubing by a locking and sealing device in which the assembly includes first and second ports in communication between the interior of the assembly and the interior of the tubing. A sensor prong is releasably installed in the isolation assembly and includes a pressure measuring instrument releasably connected thereto. After the well is flowed through the first port, the first port is closed by actuation of the prong, and pressure measurements are taken through the second port by the pressure measuring instrument. After completion of the measurement, the measuring instrument may be released from the prong and retrieved. The prong is thereafter retrieved. The first port, which is larger than a second port, is initially releasably held open.

Abstract: My invention relates to ship'logs and speedometers, comprising magnetometers and associated circuitry located inside the hull of the vessel, for accurately sensing, indicating, and recording the revolutions of an external rotator equipped with a small permanent magnet assembly. The rotator with a low-friction bearing arrangement is suitably located outside and below the hull of the vessel so that its rotation accurately registers the movement of the vessel through the water. The elimination of any mechanical or electrical connection between the rotator and the inside sensing components of the magnetometer assembly facilitates removal of the rotator for maintenance and substantially reduces the risk of leaks through the hull of the vessel.

Abstract: An electromagnetic fluid flow meter includes a probe or spool type transducer whose output is coupled through a preamplifier to a sampling switch. The output of the sampling switch is processed by a signal processing amplifier and then coupled through a phase sensitive demodulator to utilization circuits. To reduce the effect of spurious signals, a storage device is connected at the output of the phase sensor demodulator, such as a capacitor. The effect of the spurious voltages is eliminated by first detecting the presence of a spurious voltage or occurrence of an event capable of producing a spurious voltage and then disabling the phase sensitive demodulator so that the signal previously applied to the utilization circuits, which is also stored on the storage device, is maintained during the presence of the spurious voltages. In one form of the invention in which the electromagnetic flow meter is of the spool type, spurious voltages may be induced by triboelectric effects.

Abstract: The invention relates to ultrasonic apparatus for measuring flow quantities and related parameters of a liquid flowing with a free surface in a channel. Two transducers are provided with one being mounted in the channel below the level of the flowing liquid. The other transducer is mounted on a float member which is floatable on the surface of the liquid. The transducers are effectively positioned from each other and a measuring path is formed therebetween which has components in the vertical direction and in the direction of flow. There is a measuring circuit for determining the transit times of the ultrasonic waves in both directions and an evaluating circuit for determining the desired quantities with regard to the transit times.

Abstract: The invention relates to ultrasonic apparatus for measuring flow quantities and related parameters of a liquid flowing with a free surface in a channel. Two transducers are mounted in longitudinally spaced relation to each other in the channel and below the level of the flowing liquid. The transducers are positioned and directed so that the effective measuring path therebetween is reflected from the underside of the liquid surface level and has components in the vertical direction and in the direction of flow. There is a measuring circuit for determining the transit times of the ultrasonic waves in both directions and an evaluating circuit for determining the desired quantities with regard to the transit times.

Abstract: A display unit having a plurality of light emitting segments is directly attached to a circuit board, thereby avoiding use of a separate encapsulated display device. The circuit board is provided with a plurality of electrical conductors permanently attached to its component mounting surface. Electrically conductive leads extend between the light emitting segments of the display unit and the electrical conductors attached to the circuit board. The display unit includes a base supporting member to which the light emitting segments are attached in a desired configuration. The base member is preferably glued with an electrically conductive glue to an electrical conductor attached to the circuit board, thereby simultaneously physically connecting the base member directly and permanently to the circuit board and electrically connecting a common terminal of the light emitting segments to the electrical conductor on the circuit board.

Abstract: Technique for the generation of stretchings, simple shear, and other definite deformations in a specimen. The deformation is generated by help of mechanical means by impressing definite displacements to the particles located on the surface of the specimen. The mechanical means are plates, bars, and rods underlying restrictions with respect to motion, so that by relative displacement of these elements the definite displacements required are obtained.

Abstract: A welded assembly has first and second portions connected one to the other by welds about a common axis. Testing apparatus holds one of the portions against rotation about the axis and controllably exerts a torquing force of a preselected magnitude on the other portion. The torquing force is exerted about the axis and oriented relative to the welds for exerting a radial force through each of said welds. Application of the torquing force and radial forces provides nondestructive testing of the welded assembly and of the welds of the assembly, respectively.

Abstract: A rectilinear positioning mechanism for precisely controlling the rectilinear position of an output member. The rectilinear positioning mechanism of this invention includes a relatively thin beam which is flexible particularly along its longitudinal length. The flexible beam is fixed against movement at one end while the other end is free to move in the longitudinal direction.There is an input mechanism located between the ends of the flexible beam for deflecting the center of the flexible beam in a controlled, precise manner to thereby change the position of the free end of the beam.The mechanism has utility as a positioning means generally and for positioning the ends of segments of a metering blade with respect to the ink fountain roller in an ink fountain assembly.

Abstract: A drive assembly for a physically propelled vehicle such as a bicycle having a crank arm operatively connected to the drive member for rotating the drive member, and a power arm rotatively mounted on a power axis for relative angular movement between the power arm and crank arm. The drive axis, defined by the drive member, is relatively offset from the power axis. A control mechanism interconnects the power arm and crank arm for rotating the crank arm and drive member, and for accelerating the power arm ahead of the crank arm during one portion of the crank arm cycle and decelerating the power arm behind the crank arm during another portion of the crank arm cycle. A power-adjusting mechanism is connected to the power arm for moving the power axis relative to the drive axis for changing the point in the cycle of the crank arm when the acceleration and deceleration of the power arm occurs.

Abstract: Torque-equalizing means for a dual section toric or toroidal roller and race type transmission, including a balance lever pivotally mounted on the transmission housing, with oppositely disposed pivot members formed on the balance lever and pivotally connected to first and second reactive or grounding members of the respective dual roller sections for permitting the grounding members to react to any excess torque of either section resulting from a build-up of manufacturing tolerances of the components of the respective sections, the balance lever being caused to pivot as required to equalize the torques in the dual sections.

Abstract: An automatic transmission apparatus in which a machine casing is provided on one side thereof with an input shaft connected to an internal combustion engine and with a torque convertor connected to the input shaft and is provided at the interior thereof with an output shaft in parallel with the input shaft. The input shaft and the output shaft are interconnected through a high-speed transmission system having a high-speed clutch and a low-speed transmission system having a low-speed clutch. The input shaft is elongated to within the machine casing so as to form a first driving shaft of direct coupled type integrally connected to the input shaft and is provided at its elongated end portion with the high-speed clutch. A tubular form of second driving shaft is connected to the output side of the torque convertor and extends along the first driving shaft and is substantially concentric therewith. The low-speed clutch is interposed between an input side portion and an output side portion of the tubular shaft.

Abstract: An adjustable eccentric assembly is mounted on a rotatable shaft and includes a first or drive collar having an arbor extending along the shaft and a second or guide collar mounted at the end of the arbor spaced from the drive collar. The drive collars have respective guide surfaces extending parallel to the axis of rotation of the shaft and a guide track is formed in the guide collar guide surface extending perpendicularly of the axis of rotation. A hub member is supported between the guide and drive collars and engages the guide track. Adjusting means serve to shift the hub member radially relative to the rotatable shaft to adjust the eccentricity of its rotation about the shaft. A throw member having a projecting link may be rotatably mounted on the hub member so that the eccentric rotation of the hub member imparts a reciprocating motion to the throw link.

Abstract: A positive locking differential mechanism that functions to compensate for the difference in driving wheel travel which occurs when turning or traveling over uneven ground, while at the same time functioning to prevent wheel-slip when one wheel loses traction. The differential comprises a spider and center cam assembly having a plurality of trunnions projecting radially from the spider. A plurality of fixed driving clutch teeth are disposed on each side of the spider. The internal diameter of the spider mounts the center cam in such a manner that the same may be rotated a limited, predetermined distance. The center cam is symmetric, having cam lifts on each side which include rounded surfaces that provide anti-friction ramps for disengaging driven clutch members mounted on each side of the spider and center cam assembly. The driven clutch members have clutch teeth which correspond to the clutch teeth of the spider and through which a driving torque is transmitted.

Abstract: A planetary outer end of the type commonly utilized on heavy duty drive axles has a plurality of members that include a planet carrier assembly having a planet carrier housing and an abutting carrier plate rigidly attached thereto wherein the improvement takes the form of hardened high strength hollow dowel pins that are press-fitted relative to both the carrier housing and the carrier plate for locating and securing the carrier housing and carrier plate against angular movement relative to one another with a plurality of cap screws extending axially freely through the hollow dowel pins for axially fastening together the carrier housing and carrier plate, whereby the dowel pins are subject only to torsional shear loading while the cap screws are subject only to axial tensile loading thereby producing a structure that approximates the strength of a unitary planet carrier.

Abstract: An economical rotary index table holds workpieces on machine tool beds and tables, changing rotational position in angular increments with precision. Accurate angular indexing is achieved by a curvic coupling with meshing radial teeth disengageably connecting an axially movable locking plate to the juxtaposed facing rotational worktable member, separate and apart from the drive system. An annular, axially expansible pneumatic chamber is employed to engage and disengage the curvic coupling teeth, alternately locking the worktable in the desired angular orientation, and unlocking it for angular indexing movement. In the preferred embodiment, the movable angular indexing apparatus of the present invention incorporates automatic counting means for precisely determining the degree of rotation and automatic stop means for preventing further rotation when the desired position has been reached.

Abstract: An electric marking device for tattooing humans, animals, and for other applications comprises a frame assembly having a rectangular prismatic base and a pair of side plates secured to opposite sides of the base, an electromagnet assembly mounted on the base between the side plates, an armature assembly adjustably mounted between the side plates above the electromagnet assembly, an interrupter switch supported between the side plates above the armature assembly, a needle guide assembly holder pivotally supported to the front of the base, a locator key slot provided in the needle guide assembly holder, a tubular needle guide assembly including a central tubular handpiece and upper and lower tubular extensions, a positioning collar secured on the upper extension in predetermined position, a locator key secured to the positioning collar, the needle guide assembly being removably assembled with the needle guide assembly holder in predetermined position by mating the locator key of the positioning collar with the

Abstract: A multi-spindle, biaxial turning machine having means for independent tool offset in either of the axes of tool movement. The turning machine includes a slide assembly comprising a compound slide movable in a first direction with respect to the spindle axes of rotation, a cross slide mounted in sliding relation on the compound slide and movable in a direction transverse to the spindle axes of rotation, and first and second auxiliary slides, each of the auxiliary slides mounted in sliding relation to the cross slide and carrying respective first and second tool holders movable in mutually transverse directions. The compound slide, cross slide, and auxiliary slides each have associated with them drive means, which in the preferred form include a servo-drive motor and associated ball screw drive. A motion sensor is associated with each of the drive means.

Abstract: A rotary cutter in which a bed knife is displacably mounted with relation to the rotary knife so that the bed knife, when actuated, travels a path between an operative position adjacent the rotary knife and an inoperative position remote from the rotary knife. An extendable linkage connected to the bed knife defines the operative position of the bed knife at the point of maximum linkage extension. Adjusting means connected with the linkage enable precise determination of maximum linkage extension which thereby insures precise setting of the bed knife and prevents bed knife travel beyond the operative position.

Abstract: A muffin splitter having a muffin conveyor and tining assemblies located to either side of the conveyor for tining the muffins as they move along the conveyor. The tining apparatus may be deactivated to permit muffins to be passed along the conveyor without tining.

Abstract: An electronic musical instrument comprises a plurality of musical tone forming systems capable of producing musical tones of different tone qualities. A priority is established between the respective musical tone forming systems and one which is of a highest priority among one or more such systems selected by a performer is automatically selected and a musical tone can be produced only from this selected system of the highest priority. The electronic musical instrument is capable also of producing musical tones from a plurality of predetermined systems simultaneously when the priority is rendered nonoperative thereby to produce an ensemble effect.

Abstract: Each end box of an accordion has a plurality of keys arranged to control the operation of reeds within the end box with each reed producing a tone corresponding to a note in the chromatic scale which is dissimilar to the tones produced by the other reeds in the end box. The keys are arranged in longitudinal and transverse rows with the interval between adjacent keys in longitudinal rows being major thirds and the interval in transverse rows being minor seconds. The reeds are mounted on multi-celled reed blocks within a tone chamber defined in the interior of the end box. Air flow between the bellows of the accordion and the cells and, hence, through the reeds associated with the cells, is controlled by valve members secured to rods movable axially when the associated keys are depressed.

Abstract: A musical toy includes a first housing in which musical tone bars are mounted. A striking instrument rotatably mounted within a second housing and rotatably coupled to a motor for selection actuation to strike a selected musical bar. The second housing is pivotally connected to the first housing to allow the striking instrument to be positioned over a selected musical bar to produce a desired musical note.

Abstract: In combination with a workpiece having a bore, a first counterbore, and a second counterbore which is frusto-conical and tapers forwardly between the first counterbore and the bore and toward the bore,(a) a rivet having an axially extending shank received in the workbore and defining an axis,(b) the rivet including a head having an end face, a first section located forwardly of said end face, and a second and forwardly tapered frusto-conical section located forwardly of the first section,(c) the first section having an initial undeformed outer surface of a diameter which is less than but about the same as the initial diameter of the first counterbore, the rivet first section being radially deformed to have peripheral engagement with the first counterbore,(d) said head end face being substantially flush with the work surface.

Abstract: A connecting nut having a base ring supporting a torque ring in a groove in the body of the base ring and a hex ring held about the torque ring by an annular flange in another groove of the base ring to permit rotation of the hex ring relative to the base ring when the frictional contact between the torque ring and the hex ring is exceeded.

Abstract: So that explosives can be placed in an underwater hole in rock efficiently, a rock drilling machine having a rock drill mounted for extension and retraction on a strut which can be forced against a surface to be drilled, has a short debris guard tube fixed to the strut so as to extend beyond the terminus of the strut so that the debris guard may be forced against and held against the surface of the rock to be drilled. In such a machine having a very long strut and drill rod for drilling holes in rock submerged at a depth of water over four feet, a drill guide tube fixed to the strut between the debris guard and the drill has a full length door. After the hole has been drilled to depth, the drill rod is retracted from the debris guard and deflected to one side (and out of the drill guide tube door of the long strut version) and a long explosives placement tube is inserted through the debris guard tube into the hole. The debris guard is then slipped off and freed from the placement tube by retracting the strut.

Abstract: A hatch for an armored vehicle having a viewing block integral therewith to be moved with the hatch as the hatch is opened and closed. The hatch is mounted for guided movement on a downwardly sloping surface of the armored vehicle so as to move down and away from the hatch opening to allow viewing from the hatch opening downwardly over the opened hatch. The open and closing guides include a three-point roller guide rail support configured to allow the weight of the hatch to be carried by the rollers after an initial upward movement of the hatch from compressive engagement with a peripheral seal installed about vehicle openings and thence slid downwardly on the guide rails away from the opening.

Abstract: A housing is provided, the housing including a grip portion having an aperture therein to receive the fingers of a hand and a frontal breech-enclosing portion disposed forwardly of the grip portion. A breech is mounted in the frontal housing portion. A barrel is mounted forwardly of the breech, the breech and barrel being aligned with the approximate vertical center of the aperture of the gripping portion. A hammer is mounted behind the breech. A thumb actuated trigger assembly is provided, the trigger assembly including a thumb trigger mounted above and behind the aperture and a trigger linkage adapted to mechanically actuate the hammer upon depression of the thumb trigger. The alignment of the breech and barrel with the approximate center of the gripping fingers effectively places the force of the recoil in alignment with the bone structure of the arm, thereby reducing the pivoting which can be caused by recoil in conventional handguns.

Abstract: A self-advancing mine roof support is provided, in addition to the normal manually operable control valve means for controlling raising and lowering of the roof-engaging structure of the support and operation of the advancing means, with an automatic sequence control valve means operable in response to a control signal from a position removed from the support, for example from an adjacent support, and an isolating valve means arranged so that control of the various operations can be effected either by means of the manually operable means or from the safety of a location spaced away from the support being controlled by means of the automatic valve means each independently of the other.

Abstract: Apparatus is provided for introducing a scent into a forced air temperature changing system of the type having a blower and an air filter positioned upstream of the blower. The apparatus comprises a container for retaining a fluid having the desired scent. A spray device is positioned adjacent the filter and is connected to the system so that the scent containing fluid exiting through the spray device is sprayed onto the filter. A conduit connects the container with the spray device to provide a passage for the flow of the fluid from the container to the spray device. Control means serially connected in the conduit between the container and the spray device controls the flow of the fluid to the spray device. Hence, by operating the control means, the fluid is selectively sprayed on to the filter. The air flowing through the filter picks up the scent and brings the scent to the desired area.