Abstract: A chain conveyor advances brine soaked hides hanging from hooks on the conveyor to a wringer consisting of a pair of vertically oriented pressure loaded power-driven rolls, and draws the hides through the wringer with the lengthwise dimension of the hides substantially horizontal.

Abstract: Attempts to pick the plunger-type (barrel) lock disclosed are frustrated by the necessity of holding one axially movable part in place against the force of a spring while retracting another axially movable member to open the lock. The key that opens the lock has a central pin stationary in use for holding back a position while radially spreading fingers frictionally engage and thereby permit withdrawal of an axially movable cylinder coaxial with the piston. A frangible member is provided for installing the lock without using the special key so that the number of keys can be strictly controlled. The key will open not only the lock of this invention, but also other kinds of plunger-type locks in common use by gas and electric utility companies.

Abstract: This invention is concerned with permutation locks having a wheel pack comprising a plurality of rotatable permutation discs, each having a recess which must be correctly aligned before the bolt of the lock can be withdrawn. One known method for determining the positions of the permutation discs is by analysis of X-radiation which has passed through the wheel pack parallel to the axis of rotation of the discs. In locks according to this invention, the opacity of the wheel pack to penetrating electromagnetic radiation along any line parallel to the axis of rotation of the discs is independent of their orientation.

Abstract: An apparatus for manufacturing split pulleys includes a frame and a spindle assembly supported by the frame having an upper spindle and a lower spindle assembly for supporting for rotation a blank to be split therebetween. The lower spindle assembly includes a clamping mechanism having a screw means for drawing the upper spindle toward the lower spindle assembly and the lower spindle assembly toward the upper spindle to clamp the blank to be split therebetween. Bearing means are disposed between the frame and the spindle assembly for supporting the spindle assembly for rotation. The clamping means are operative to exert a clamping force between the upper spindle and the lower spindle assembly which is isolated from the frame and the bearing means to clamp a blank therebetween. A pair of rotatable tools are provided each of which has an axis of rotation parallel to the axis of rotation of the spindle assembly and each of which is associated with a motor means to effect rotation of the tools.

Abstract: An ironing ring for use in the manufacture of drawn and ironed unitary sheet metal can bodies made from flat rolled steel blackplate. The interior working surface of the ironing ring is treated by diamond wheel grinding, or the like, to form fine-line indentations which decrease the surface contact of the ironing ring with the metal surface being ironed. The linearly extended indentations extend over the entry portion of the ring to, or into, the dwell portion of the ring and help draw ironing lubricant into the ring during the ironing operation.

Abstract: A bending rolls machine having the intermediate roll and shaft thereof driven from a "linking chain" by a gear located at the pivot point of a pivot member carrying the intermediate roll and shaft on the distal end of the pivot member, and the pivot-point gear being driven by another intermeshed engaged gear, and the two spaced-apart rolls being driven through a link-chain drive, and there being push buttons requiring pressure to continue to drive the rolls forwardly or alternately reversedly rotatably, and alternate automatic-run buttons for continuing to drive once initiated, and an emergency-stop lever-button to over-ride other buttons.

Abstract: A pressure vessel for containing fluid at very high pressures is formed from an axially aligned array or stack of like, flexible, relatively thin, dished discs, i.e., Belleville springs. The discs are clamped together axially, so as to flatten them into a pressure vessel wall structure which is pre-stressed in hoop compression along a bore formed by the aligned inner peripheries of the discs, and in hoop tension along the aligned outer peripheries of the discs. Such pre-stress pattern is particularly well adapted to permit the pressure vessel to support very high fluid pressures within the pressure vessel bore. A liner tube may be located within the bore formed by the aligned inner peripheries of the discs, while any suitable end closing mechanisms, e.g., a die assembly and a piston, may be employed to close the axially opposite ends of the pressure vessel bore.

Abstract: Jewelry bands of various polygonal and arcuate shapes are made by forming an annular blank band to the desired shape. Shaping is achieved by forcing the blank rearward and onto an elongated male member having a tapered front portion which merges into a rear portion with a cross-section of the desired shape. The blank is forced rearward by pressing the male member into an aperture in a female member which is shaped to conform to and receive the rear portion of the male member. Compressing the formed blank against the rear portion of the male member makes it conform more closely to the desired shape, and eases removal of the shaped band from the male member.

Abstract: High-precision, fine-detail forgings are formed from a workpiece material having superplastic forming characteristics by utilizing high strain rate forming to impart the bulk of the total deformation required and superplastic relatively low strain rate forming to impart detail and approach final tolerances in the product.

Abstract: A pulling tool which comprises a pulling bar which, in a simple form, comprises an L-shaped length of tool steel rod and a pulling hook which comprises a length of tool steel rod having a hook formed in one end thereof for hooking the pulling hook with one leg of the pulling bar. The opposite end of the pulling hook can be adapted to have coupling means affixed to it for pulling on the pulling hook.To use the pulling tool, two holes are drilled in the body of the vehicle in the damaged area, and in spaced apart relationship. One leg of the L-shaped pulling bar is inserted through one of the holes, and the pulling bar is manipulated so that the leg extended through the hole extends substantially parallel with the surface contour of the body of the vehicle, and so as to project towards the second hole drilled in the body. The hook on the pulling hook then is extended through the other hole formed in the body of the vehicle and hooked with the leg of the pulling bar.

Abstract: A differential microcalorimeter comprises a means for programmed heating of cells which accommodate heating and thermosensitive elements, a means for measuring power output of a thermal process under study, an a-c voltage source and a temperature measuring circuit, as well as a variable resistor for adjusting the baseline. The outputs of the means for measuring power output of a thermal process under study and of the means for programmed heating of the cells are connected, via appropriate phase-sensitive switches, to the second terminals of the series connected heating elements having their interconnected first terminals connected, via an appropriate phase-sensitive switch, to a movable terminal of the variable resistor for adjusting the baseline.

Abstract: An arrangement and method is provided for testing the seal of a sewer lateral saddle connector assembly used in connecting a lateral or branch sewer pipe line into a sewer main at a point where there is no "T" or "Y" connector available.The sewer branch saddle connector assembly consists of a cast iron saddle which is arranged to fit over a hole to be tapped in the sewer main. A 360.degree. circular rubber "O" ring sealing gasket is provided which is cemented in a retaining groove, on the underside of the sewer branch saddle connector assembly. A stainless steel strap, together with bronze T bolts and the attaching washers and nuts, secures the sewer branch saddle connector assembly to the sewer main, thus making a water-tight connection. The male connection end is shaped to accommodate all standard couplings and adaptors.A sewer branch lateral tester is then positioned over the open end of the male connection and sealed thereto.

Abstract: A transducer for measuring the amplitude of vibration of a member vibrating at a constant frequency. An outflow aperture is supplied from a compressed air supply, and opposite to the outflow aperture an obstructing element is arranged which can close the outflow aperture, the outflow aperture and element undergoing relative motion transverse to the direction of air flow. The average quantity of outflowing air is measured.

Abstract: A method of measuring surface hardness combining the techniques of Brinell Hardness testing and air-gauging by providing a hard penetrator member having in it a passage and apertures through which air under pressure is passed. The hardness of a work piece is measured by measuring the effect on air pressure caused by occlusion of the apertures as the penetrator is pressed into a specimen of which the hardness is to be measured.

Abstract: A method and apparatus for indicating the density of a mass of course particles, such as track ballast, uses the immersion of a tool capable of penetrating into the mass, for instance a tamping tool. The degree of the density is a function of the time of the immersion stroke, the length of the immersion stroke and the immersion force. One of these parameters is measured while the other two parameters are predetermined to determine the measured value of the degree of density, and the measured value is indicated. In a mobile track tamping machine, this is accomplished by actuating a time measuring device by switching elements arranged to be actuated by the immersing tool for measuring the time required by the tool for immersion in the ballast through a predetermined immersion stroke. The time measuring device transmits corresponding time signals to an indicator.

Abstract: A device for measuring the flow of a fluid in a pipe by creating aneasily measurable pressure differential which is related to flow comprises a diaphragm transversely contained in the pipe or an associated branch pipe. The diaphragm has a multiplicity of closely spaced fluid flow holes which are so shaped as to increase fluid flow velocity through the diaphragm, and means are provided downstream faces of the diaphragm said means being intended to be connected to a differential pressure indicating or recording instrument from which a fluid flow measurement can be derived.

Abstract: An apparatus for detecting misfire in a multicylinder internal combustion engine, comprising a sound pick-up transducer disposed in the exhaust passage of the engine or a chamber communicating with the exhaust passage for the purpose of detecting exhaust sound, an integrating circuit for integrating an electric output of the transducer in synchronism with the rotation of the engine and a comparison circuit for comparing the output of the integrating circuit with a reference signal, thereby misfire being detected on the basis of an output of the comparison circuit.

Abstract: A volumetric air flowmeter for internal combustion engines, which includes a cast metal housing, a rectangular airflow channel therewithin, and a transversely-extending, trapezoidal-shaped pivotal baffle plate mounted on a pivot shaft. There is also provided on the pivot shaft a damping flap, angularly offset with respect to the baffle plate, which revolves, in unison with baffle plate deflection, about the shaft axis into a damping chamber. Circumferential clearances are provided between the baffle plate and its channel and between the damping flap and its chamber.

Abstract: A gas meter temperature compensating tangent device having a tangent block to which is adjustably connected a tangent arm for journaling a crankshaft. The tangent block has a guideway formed in alignment with the axial line of the tangent arm. A plurality of nested "U" shaped bi-metal strips have one end pivotably connected to the tangent block and the other end connected to a tangent wrist which is slideably disposed in the guideway. The bi-metal strips will sense temperature changes in the gas and force the tangent wrist to slide in the guideway to increase or decrease the distance between the tangent wrist and the crankshaft.The tangent device provides improved accurate deflection due to temperature changes as a result of built-in radial rigidity of the tangent wrist relative to the tangent arm.

Abstract: A pressure transducer for measuring pressure in a fluid, comprising a pressure-sensitive element which is formed from semiconductor material and bonded over a bore in an insulating holder, through which bore fluid to be measured is passed; and a sealed cap through which connection conductors are led.

Abstract: A pressure gauge comprising a diaphragm, a cylinder seat, and a driving helix movable up or down to constitute the operating elements. A rotary shaft with a pin fixed thereon rotates clockwise or counterclockwise responsive to the movement of the diaphragm. The rotary shaft will return to its initial position when the pressure on the diaphragm is removed by the restoring force of a helical spring.

Abstract: An apparatus for the continuous collection of a time-weighted gas sample is disclosed. The apparatus inclues a gas reservoir and an openable and closeable gas flow assembly communicating with the reservoir which assembly allows gas to flow at a constant rate from the exterior of the reservoir to the interior of the reservoir when there is a sufficient gas pressure differential between the exterior and interior of the reservoir so that the passing gas achieves a linear velocity in the throat of the gas flow assembly equal to the velocity of sound in the passing gas in the throat. The apparatus of this invention may also include additional gas sample removal assemblies attached to the reservoir.

Abstract: An upright post has a rounded bearing member at its upper end provided with a discharge port through which air, supplied at the lower end of the post, exits. A cylindrical bearing body is formed with a vertical bore extending therethrough so as to accommodate therein a longitudinal portion of the upright post, the bore being slightly larger in diameter than the post. The bearing body supports upper and lower balancing mechanisms, each including a plate or platform having four quadrantly located sensing ports. A bearing cap overlying the rounded bearing member is affixed to the platform of the upper balancing mechanism. The platform of the upper balancing mechanism removably rests on the top of the bearing body and has mounted thereon a pair of reversible air motors, each having a shaft and shiftable weight threadedly disposed on the shaft.

Abstract: A control device sensitive to speeds exceeding a pre-determined rotation speed, characterized in that it comprises a mobile locking ring for a driving organ, resiliently returned to the locking position, a sleeve freely rotating inside said ring at a speed linked to the speed to be controlled, and comprising at least a peripheral fly-weight, returned to its rest position by a calibrated spring, and mounted in such manner as, under the action of the centrifugal force created by said pre-determined rotation speed and against the action of the return spring, to engage with the inner surface of the ring, in order to cause it to leave its locking position.

Abstract: The chain drive comprises spaced parallel endless chains extending along a path, for transferring work-carrying pallets between work stations, with the transfer path including rectilinear sections connected by bends in the path. The chains are driven by a drive mechanism, located on a rectilinear portion of the transfer path, and including respective sprockets engaged with the chains and driving the chains at equal speeds, with the arc of contact of each chain with its associated sprocket being equal to that of the arc of contact of each other chain with its associated sprocket. At the drive unit, the chains engage spaced parallel rectilinear chain guides, and the pallets are guided along rectilinear guide rails. Each pallet is secured to a pair of spaced parallel endless chains.

Abstract: A two mass vibratory material handling apparatus has a first mass that includes a vibration exciter of the rotary eccentric weight type and a second mass that includes an object to be vibrated. The two masses are interconnected by resilient elements designed to permit a desired vibration amplification from the vibration exciter to the object to be vibrated. The vibration exciter has a drive with an adjustable drive ratio located between a fixed r.p.m. at full voltage motor drive shaft and a shaft that rotatably supports eccentric weights. Variable pitch pulleys or a set of pulleys having various pitch diameters and provided so that pitch diameters can be selected therefrom for mounting one pulley on each shaft with a drive belt trained about the pulleys and thus, provide a drive ratio enabling the fixed frequency motor to drive the eccentric weights at a selected operating frequency.

Abstract: An improved clutch is described for use in a smoke and fire protection system comprising a pulley which in the normal operating position is engaged by a torque transmitting means so that the pulley may be controlled by an associated drive mechanism such as a stall motor or break motor. Either upon receipt of a signal from a remote source or upon an increase in the ambient temperature surrounding the apparatus, such as might occur during a fire, a heat responsive means disengages the pulley from the torque transmitting means thereby allowing the pulley to freely rotate about its axis to deploy its associated fire protection equipment. In the preferred embodiment, one or more bimetallic links of either "straight" or serpentine configurations are employed to move the pulley axially along its axis of rotation, thereby disengaging the pulley from an adjacent associated drive plate.

Abstract: A tensioning device for a run of a chain comprises a toothed roller, for engagement with the chain, rotatably mounted on a crank-pin which is rotated about an axis by resilient means to bring the roller into tensioning contact with the chain. Angular movement of the crank-pin is limited by means carried by the output member of a freewheel. This output member is urged by further resilient means which are weaker than the first mentioned resilient means in the direction to tension the chain.

Abstract: A forward and reverse mechanism having a single direction foot pedal and having a control member extending to a device to be controlled by the movement of the foot pedal. Forward and neutral and reverse mode mechanism interconnects the foot pedal and the control member, and a shift member sets the mechanism in the desired one of the three modes. With the mechanism set in any one of the three modes, simply depressing the foot pedal will create the forward or the reverse or will establish the neutral condition for the entire assembly.

Abstract: A worm gear transmission having a worm wheel which is journalled in a housing and a worm rotatably journalled at one end in a bearing pivotably connected to the housing, and at the other end in a second bearing engaged by an adjustable pre-load spring which presses the worm towards the wheel. The pivotably arranged bearing is also axially displaceable and is coupled to a first member which cooperates with a second member, rigidly coupled to the housing at least in the axial direction, such that, upon axial displacement of the pivoted bearing by torque loading, one of the members undergoes transverse displacement which is coupled to vary the pre-load force in the spring.

Abstract: A pull rod assembly is disclosed which includes telescoping inner and outer rod members one of which is adapted for connection to a drive member and the other of which is adapted for connection to a driven member. A pair of movable pawls are carried by the outer rod member and are operable to interlock with the inner rod member to maintain the rod members in selected axial positions relative to each other. Control means are operative to effect selective release of the pawls such that the overall length of the pull rod assembly may be varied while the driven rod member is subjected to a reciprocating motion from the drive member.

Abstract: A transfer case assembly is disclosed as comprising two output shafts rotatably supported within the transfer case housing in a coaxially relationship and connected to the output hubs of a two-way roller clutch. The transfer case input shaft is rotatably supported within the housing in a parallel relationship to the output shafts. A chain drive sprocket is rotatably mounted on the input shaft directly coupled to the two-way roller clutch by an endless drive chain.

Abstract: The combination of a hydraulic torque converter and planetary gear system in a wheel hub characterized in that the selective speed control of an individual wheel is achieved through the hydraulic torque converter, thereby obviating the need of gear shifting as in the anterior combinations.

Abstract: A straight dental handpiece comprising a pair of telescoping housing barrels which can normally swivel relative to each other, one containing a chuck and the other containing a vane type air motor. A change speed transmission is entrained between the motor and the chuck, such transmission being adjustable to change speeds by relative endwise movement of the barrels. Opening and closing of the chuck is accomplished by relative rotation of the barrels while holding down a stop button. A reversing valve, also on the handpiece, is movable into either of two positions relative to one of the barrels to supply air under pressure to either of two passages to drive the motor in one direction or the other.

Abstract: A reduction drive unit, such as a wheel hub of the type including a fluid motor operable to rotate a shaft, a sun gear engaging the shaft, a planetary gear set engaging the sun gear, and a ring gear driven by the planetary gears to drive a rotating hub. The rotating hub includes a secondary hub portion surrounding the housing of the fluid motor, with a bearing set and an oil seal disposed between the motor housing and second hub portion. The oil seal has a large enough diameter, relative to the bearing set and adjacent portions of the motor housing and hub portion, that the motor housing may be removed from within the hub without damaging the oil seal.

Abstract: A grinding machine for sharpening circular saw blade teeth. The machine includes an arbor for supporting a circular saw blade at a pre-selected position relative to a grinding disc. The grinding disc is mounted to a parallelogram linkage that has a tracing pin fixed thereto. Movement of the tracing pin over the surface of a sawtooth-shaped template causes corresponding movement of the grinding disc against a selected sawtooth. Also included is a tooth indexing mechanism whereby precise spacing of the circular saw teeth is obtained. This is accomplished by a tooth spacing pattern mounted to the arbor and by an indexing pawl that facilitates rotation of the arbor in precise increments equal to desired spacing for the teeth of the blade being operated on. The arbor is pivotably mounted relative to the grinding disc to enable bevel grinding of the tooth surfaces.

Abstract: A grinder accessory for use with a bench grinder including a uniquely designed three element structure and associated connecting and releasing means for attaching the accessory to the grinder when chain saw blades are to be sharpened while permitting quick removal of the grinder accessory to permit other uses of the grinder. The system includes a grinder mounting bracket, a bushing mount with a lower bracket mounting extension, and a dog latched chain saw positioning and holding tool. The mounting bracket bolts directly to the frame of the bench grinder using a screw and locknut inserted into a pre-existing hole in the grinder frame with the bushing mount located along a channel in the bracket at a position suitable to permit engagement of the grinder wheel with the cutting edges of the blades of the chain saw.

Abstract: A rotary machining head having a pair of dynamically balanced cross-feed slides with tool blocks mounted thereon for radial cross-feed machining each, provided with a counterweight including a lost motion connection and a stop limiting the counterweight's radially outward movement to provide a partial counterbalancing of the centrifugal force operating on each of the tool blocks resisting radially inward feed. The lost motion connection permits the tool block to continue radial inward movement without counterweight effect, the stop being adjustable to arrest counterweight effect before any weight shift across the center line occurs.

Abstract: A lathe bed includes a steel reinforced concrete body with a torsionally flexible frame and means for rigidly connecting the ends of the frame to the body. The frame includes track members for a tool carrier. In one embodiment, the frame is made of two elongated box-like side members and two transverse column guide members, the side members being fixedly attached as by screws to the concrete body and the column guide members being fixedly attached to the side members. In another embodiment, one side member is used and the two column members extend between the side member and a wall portion of the body at the other end. The body is shaped to permit clearance for turnings removed from a workpiece and for a multiple tool magazine. The headstock, feed drive, longitudinal slides and tailstock are mounted on the frame. The body contributes rigidity to the otherwise torsionally flexible frame to produce a rigid and sturdy unitary lathe bed.

Abstract: A film trimming device places opposing wheel rollers on spaced-apart axes of rotation on respective separate shafts therefor, with radially outward circumscribing faces thereof in contact and moving in a common direction at the point of contact, with a blade's cutting edge directed in a direction substantially opposite to that common direction and pressed against correspondlateral side faces of the contacting rollers at the point of contact of the rollers, with tape guiding and channeling structures shaped and positioned to regulate adjustably the amount of tape margin extending beyond the lateral side faces of the rollers when guided onto the radially outward circumscribing face of one of the rollers before reaching the cutting edge and for channeling the trimmed tape to a take-off point, the blade being normally biased into the cutting position and being retractable therefrom for permitting first drawing a portion of fed tape to and beyond the cutting point before gradually returning the cutting edge to pre

Abstract: A transfer machine for cutting rolled sheet metal comprises a sheet loading arrangement, a feed mechanism for moving a sheet to the blades of guillotine shears, an arrangement for sorting and stacking cut-off blanks, and a program control system. The sheet loading arrangement comprises a receiving table which is fixedly mounted and located on the axis of the transfer machine, and a four-member linkwork with a sheet grip. The linkwork is constructed so as to provide for transferring a sheet from a stack onto the table of the feed mechanism along the axis of the machine, the sheet remaining parallel to the table of the feed mechanism during the transfer. Fitted on the table of the feed mechanism is a sensor responsive to the passage of the rearward sheet edge. This sensor provides for measuring the dimensions of blanks from the rearward sheet edge on the reverse stroke of the feed mechanism.

Abstract: The cutter comprises a cutter body having an upper support surface formed with an elongated rectangular opening with inwardly extending rails on the opposite longer sides of the opening and on one end of the opening. An open rectangular support frame is engageable with the rails and has a length less than that of the opening, for reciprocation along the rails, and coil springs, engaged in recesses in one end of the rectangular opening bias the support frame to engage the other end of the opening. An open rectangular blade frame is removably and conformingly seated in the opening of the support frame, and has a plurality of cutting blades extending longitudinally across the opening therein in equispaced substantially parallel relation. A pressing cover is hinged at one end to the cutter body and has a free end provided with an operating handle, and the pressing cover has projections on its inner surface engageable through the spaces between the cutting blades.

Abstract: A punching machine for use in punching holes in the sides of articles incorporating two C-shaped assemblies forming punching tool supports and guided within the machine in such a way that they can be displaced and moved away from each other. Means are provided for placing the assemblies, on the one hand, in a working position, in which the position of a punch tool on one of the tool supports is maintained at a predetermined distance from a guide plane coinciding with a guiding surface on the article to be drilled, and in which the spacing of the tool supports is maintained at a predetermined value, and on the other hand, in a position for rotation of the article to be drilled, such that each assembly is displaced in relation to its working position in the sense of an increase in the distance separating the two assemblies.

Abstract: The present electromagnetic pickup and method, and the piano incorporating the pickup, make use of a protuberant magnetic pole piece portion which is so constructed and related that (a) the lines of magnetic force loop back therefrom, and (b) the concentration of such lines is sharply more dense on one side of such portion than on the other side thereof (the magnetic field adjacent such portion being therefore highly asymmetrical). The tine tip is caused to vibrate adjacent such portion, which produces in an associated coil a musical signal characterized by a high degree of brilliance and piano-like musicality -- without an excess of the second harmonic. The pole piece portion is preferably offset from the axis of the coil. Preferably, there are two such offset portions, spaced on opposite sides of the coil axis, and each has a peak shaped as a substantial point or edge.

Abstract: A self-contained unit for the re-stringing of a bow for a musical instrument as a replacement for the traditional horse hair comprises a hank of reorientated monofilaments each containing at least a substantial proportion of polyvinyl chloride and having a diameter in the range of 0.15 to 0.40 mm. The adjacent free ends of the monofilaments are bonded together to form an enlargement at each end of the hank and these are preferably trapped mechanically in recesses at the ends of the bow although they can be glued in position in the traditional manner if required. When the unit is fitted mechanically the frame of the bow has at one end a recess with a restricted mouth fitted with a spring-loaded member for jamming the mouth under the spring force, but capable of yielding inwardly to permit the introduction of an enlargement at the end of the unit, and at the other end it has an adjustable frog formed with a recess provided with a longitudinally slidable cover.

Abstract: A synthetic material drumstick of the type commonly employed in the playing of various percussion instruments such as drums, cymbals, and the like, wherein the drumstick is fabricated from fiberglass reinforced polyester resin rod stock material machined to a specified dimensional configuration, which configuration, in combination with the material employed, provides a drumstick of significantly high durability characteristics.

Abstract: A chord indicator for keyboard instruments comprises an elongated panel having lights therein which will be aligned with each key when the panel is placed adjacent the keyboard. Two rows of lights are provided, one indicated the white keys and the black keys as sharps and the other indicating the black keys as flats. A chord selector mechanism comprises a base having spaced contacts thereon corresponding to the lights on the panel and a carriage movable along the base having contacts corresponding to the notes of selected chords. Chord selector switches permit selection of the type of chord to be displayed and the location of the carriage on the base permits selection of the root note of the chord. Electrical means permit the chord to be indicated as having either sharps or flats as appropriate for the selected chord. In use a chord type is selected, a root note is selected, and the lights on the panel aligned with the keys corresponding to the notes of the selected chord will be illuminated.

Abstract: A tack package to be loaded in a tack-spitting machine magazine is disclosed, in which the individual tacks are arranged in line and consecutive tack heads are cemented to each other by a hot melt adhesive applied in drops; when using a glue-gun or similar tool, it is an advantage not to discontinue the cement feed so as to have consecutive adhesive drops connected by a slender adhesive seam.

Abstract: An improved fastener assembly includes helical internal and external thread convolutions. A generally helical insert having a plurality of turns is disposed between the internal and external thread convolutions. This insert is resiliently twisted or flexed from a first condition to a fully deflected condition under the influence of torsion forces applied to the insert by the internal and external thread convolutions. In one embodiment of the invention, the insert has four side surfaces. When this insert is in the first condition, one pair of side surfaces is disposed in abutting engagement with the leading flanks of the internal and external thread convolutions. At this time the other side surfaces of the insert are spaced apart from the trailing flank surfaces of the thread convolutions. As used herein, the leading flank surfaces of the thread convolutions are the flank surfaces which, when the thread is about to be assembled with a mating thread, face the mating thread.

Abstract: A symmetric screw thread system including external threads each profiled to have a flank angle of (70 .+-. 2).degree. and a flat root located at (0.27 .+-. 0.02)H from an intersecting point of two lines extended from opposing flanks of two adjacent threads and connected to said opposing flanks through arcs of a radius (0.15 .+-. 0.02)p where H is the depth and p is the pitch of the threads. Alternatively, the system may include external threads configured to have a flank angle of (106 .+-. 5).degree. and connected by a root having a radius of (0.30 .+-. 0.01)p.