Abstract: A die set consisting of three separate dies is disclosed, with the first die having thread forming ridges on both sides thereof and both sides being flat, i.e., the contact surface areas thereof lying in a single plane to engage a flat, planar die support surface in the die holder. Each of the second and third dies is a single-face die with a flat, planar rear face to engage the die holder, and the working face of each of the second and third dies includes a longitudinally tapered portion and a parallel dwell portion for final finishing of the workpiece. This effectively doubles the die life for only a fifty percent increase in die material. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

Abstract: Thread rolling dies are disclosed which are provided with a band of roughness extending along the flanks of the thread forming grooves in the dies. The roughened bands provide traction between the blank and the dies so as to establish rolling without slippage at about the initial blank diamter. The roughened band is produced by electric discharge machining or grinding, using a precision-formed electrode. The electrical power applied during the formation of the roughened band is controlled so that the greatest amount of roughness, and in turn traction, is provided at the start end of the die and the band is provided with a progressively decreasing amount of roughness as it extends toward the finish end of the die. The band of roughness ends at a location spaced from the finish end of the die so that the flanks of the thread formed on the blank are smooth at the completion of the rolling operation.

Abstract: An adaptor for a tooling attachment employs a hydraulically actuated sleeve clamp which secures an adaptor sleeve to the spindle housing of a machine tool, the attachment being affixed to the sleeve. A coupling assembly permits locking the adaptor sleeve at selected angular positions relative to the spindle housing, indexing of the sleeve being accomplished through the use of a pinion drive and an indexing gear. Indexing of the adaptor sleeve is permitted by a clamp mechanism which engages a circumferentially extending slot of the adaptor sleeve and which causes engagement and disengagement of the coupling assembly.

Abstract: A variable position throttle stop and dashpot apparatus is shown as having a variably positionable throttle stop member having positions corresponding to and/or determining positions of engine idle throttle position and engine shut-down or anti-diesel throttle position with dashpot means effective for damping the rate of throttle closing movement regardless of whether the engine is operating or shut-down; resilient means are effective for moving the throttle stop member to a position for early engagement with linkage means associated with the throttle in order to thereby effectively damp the rate of closing movement of the throttle valve; and solenoid means is effective when de-energized to permit the throttle stop member to move to the anti-diesel position.

Abstract: A wire feed protection system for an electrical discharge machining apparatus and machine tool. The workpiece is supported for movement along two coordinate axes in the "X" and "Y" direction through electrically controlled stepping motors in a manner which is well known to the art. The electrode is of a wire or band configuration and is so supported, guided, and driven that the cutting portion of the electrode which is aligned with the workpiece before and during cutting remains properly oriented and travels without bend or distortion in its path. When the wire breaks, bows or otherwise is caused to lose tension, a switch is operated to interrupt machining power pulses being supplied to the machining gap. For this purpose, a switch is located at one or more critical and predetermined locations in the wire electrode path, with the switch actuator in each case in engagement with the wire during transversal.

Abstract: A roughing cutter has a generally cylindrical shank with a plurality of lands and angular flutes separating the lands. A plurality of straight-crested cutting teeth are formed on the lands with radial relief. Each tooth has a straight cutting edge generally perpendicular to the radial direction. The orientation of the cutting edge permits it to be in parallel relationship to a surface of a workpiece while in cutting engagement. This results in a smoother finish than would otherwise be possible. The teeth of the roughing cutter may be cut by an axially advancing milling cutter with a sloping cutting edge.

Abstract: A system for controlling an electrical discharge machining apparatus in which there is an electronic output switch connected between a power source and an electrical discharge machining gap for providing to the gap machining power pulses of predetermined on-off time. The system further includes a current limiting stage for limiting the peak current provided to the gap at certain critical combinations of on-off time ratios so that possibility of gap short circuiting is substantially eliminated. This system further includes a programmable computer operable to receive a plurality of operator provided and memory stored data inputs, including one for controlling pulse on-time and the other as a current limiting signal for the current limiting stage. The system further includes a reference signal and a signal network connected to the gap for providing a feed-back of a gap voltage signal.

Abstract: Pull starters for cranking an internal combustion engine in a cranking direction include clutch driven means mounted upon a rotatable part of the engine which is rotated during starting by driving clutch means mounted for rotation by a starting pulley. The starting pulley is a spring retrieved pulley which causes rotation of the driving clutch means. The pulley carries projecting clutch disengagement means to forceably disengage the driving clutch means from the clutch driven means if normal disengagement does not occur.The starting pulley is provided with a spring retaining collar extending from one surface of the pulley, and this collar is provided with an outer spring engaging surface. An open ended spring retaining channel is formed beneath the collar outer surface, and a cam step surface extends inwardly from the outer surface to guide a spring into the open end of the channel. Also, the collar is formed to lock a spring end within the spring retaining channel.

Abstract: A power supply circuit particularly useful in a multiple gap or a multiple electrode system in which multiple electrodes and a common workpiece or multiple electrodes and a like number of workpieces are selectively connected in circuit with a common DC source power supply circuit. A switching system is further provided for reversing the polarity of electrode relative to workpiece. A power supply circuit itself incorporates a specialized push-pull drive stage effective to drive the output stages in either polarity setting in such manner as to allow for negligible noise in the system. The drive system is one which generates triggering pulses effective to switch the output transistor bank in either polarity very rapidly and independently of the number of output leads which may be included.

Abstract: A thread rolling die and a method of thread rolling is disclosed for producing the annular rib on a threaded fastener suitable for retaining washers, clips or the like. The ends of the threads adjacent to such rib blend to the root diameter of the thread. The annular rib is produced by axially displacing workpiece material from the adjacent end of the thread. The die for rolling the thread is formed with thread forming grooves which extend to a base line spaced from the parallel to the lateral side of the die. At the base line the thread forming grooves fade to zero depth. Positioned between the base line and the lateral side of the die is a rib of increasing width which functions to displace material axially into the required rib.

Abstract: A fuel carburetor structure is shown having a main fuel bowl or reservoir with a second fuel reservoir therein; a fuel inlet valve assembly for controlling the rate of fuel flow to both the main and second or auxiliary reservoirs is shown as having a needle-like inlet valve positioned by a float carried within the main reservoir and responsive to the level of the fuel contained therein; additional valving means resiliently resists the flow of fuel into the main reservoir and the degree of such resilient resistance is reflective of the degree to which the needle-like inlet valve has been moved toward its fully closed position; the additional valving means also serves to cause a flow of fuel from the needle-like inlet valve to the auxiliary reservoir via related conduit means.

Abstract: A system for controlling the cutting of a workpiece with a wire electrode. The system provides for inclining the electrode wire in the path of traversal in opposition to the electrode such that a predetermined incline or taper is given to the workpiece during cutting. This is accomplished with precision control and sizing by providing an eccentric device positioned between a pair of orthogonal rollers, each spaced from opposing surfaces of the workpiece, so that a conical cutting path is described with respect to the electrode wire as it traverses in proximity to the workpiece during cutting.

Abstract: A semiautomatic pistol has a frame which supports a barrel and breech-slide for chambering a cartridge in the breech end of the barrel and extracting a spent cartridge. The breech-slide carries an inertia type firing pin which is displaced to fire a chambered cartridge by a hammer pivotally mounted upon the frame. A trigger bar, mounted upon a trigger displaces a sear to release the hammer when the trigger is pulled. A breech-slide operated disconnect causes pivoting of the trigger bar as the breech-slide recoils to allow the sear to snap back to a position in which it can engage the searing surface of the hammer when the breech-slide moves forwardly.A firing pin lock is biased to a position where the pin is free to travel under the impetus of a falling hammer. The upper surface of a pivotally mounted shell ejector normally engages the firing pin lock to maintain it in a position where the firing pin is locked.

Abstract: A wire feed system for an electrical discharge machining apparatus and machine tool. The workpiece is supported for movement along two coordinate axes in the X- and Y-direction through electrically controlled stepping motors in a manner which is well known to the art. The electrode is of a wire or band configuration and is so supported, guided, and driven that the cutting portion of the electrode which is aligned with the workpiece before and during cutting remains properly oriented and travels without bend or distortion in its path. The improvements in the support and drive mechanism for the wire electrode include a particular arrangement of driving and driven rollers for providing a constant pulling force on the wire and a set of orthogonally oriented guide rollers for holding the wire electrode in a predetermined path proximate the workpiece.

Abstract: The system includes a pair of stepping motors for controlling relative movement of the wire electrode relative to the workpiece with the velocity of movement being controlled as a function of gap voltage. For this purpose the system includes a voltage controlled oscillator having its input coupled to the machining gap and its output interconnected with the drive circuits for the two stepping motors. The system further includes a divider stage which becomes operable in the system responsive to drop of voltage indicating gap short circuit condition so that a drastically reduced number of stepping pulses are provided to the motors throughout the duration of the gap short circuit condition. After removal of the gap short circuit condition, an increase in voltage allows changeover through several different gating stages to again return the output of the voltage controlled oscillator to its normal frequency range so that the feed of the electrode relative to the workpiece is again continued.

Abstract: An automotive fuel system which has a fuel tank, a fuel pump, a fuel metering device for metering fuel flow to an associated fuel-consuming engine, and a fuel reservoir (such as, for example, a carburetor fuel bowl), has a valving assembly interposed generally between the outlet of the fuel pump and the fuel reservoir with such assembly being responsive to, for example, the associated vehicle experiencing a crash impact or a roll-over condition whereupon such valving assembly becomes effective to prevent the further flow of fuel from the fuel pump into the fuel reservoir.

Abstract: An automotive fuel system which has a fuel tank, a fuel pump, a fuel metering device for metering fuel flow to an associated fuel-consuming engine, and a fuel reservoir (such as, for example, a carburetor fuel bowl), has a valving assembly interposed generally between the outlet of the fuel pump and the fuel reservoir with such assembly being responsive to, for example, the associated vehicle experiencing a crash impact or a roll-over condition whereupon such valving assembly becomes effective to prevent the further flow of fuel from the fuel pump into the fuel reservoir.

Abstract: An automotive fuel system which has a fuel tank, a fuel pump, a fuel metering device for metering fuel flow to an associated fuel-consuming engine, and a fuel reservoir (such as, for example, a carburetor fuel bowl), has a valving assembly interposed generally between the outlet of the fuel tank and the inlet of the fuel pump with such valve assembly being responsive to, for example, the associated vehicle experiencing a crash impact or a roll-over condition whereupon such valving assembly becomes effective to prevent further flow of fuel from the fuel tank into the fuel reservoir.

Abstract: An automotive fuel system which has a fuel tank, a fuel pump, a fuel metering device for metering fuel flow to an associated fuel-consuming engine, and a fuel reservoir (such as, for example, a carburetor fuel bowl), has a valving assembly interposed generally between the outlet of the fuel pump and the fuel reservoir with such assembly being responsive to, for example, the associated vehicle experiencing a crash impact or a roll-over condition whereupon such valving assembly becomes effective to prevent the further flow of fuel from the fuel pump into the fuel reservoir.

Abstract: An automotive fuel system which has a fuel tank, a fuel pump, a fuel metering device for metering fuel flow to an associated fuel-consuming engine, and a fuel reservoir (such as, for example, a carburetor fuel bowl), has a valving assembly interposed generally between the outlet of the fuel pump and the fuel reservoir with such valving assembly being responsive to, for example, the associated vehicle experiencing a crash impact or a roll-over condition whereupon such valving assembly becomes effective to prevent the further flow of fuel from the fuel pump into the fuel reservoir.