Snap-on Tools Corporation

Snap-on Technologies, Inc.

Snap-on Tools Company

Donald D Grover

Thomas P Becker

Gene E Olson

Christopher B Stout

Glenn A Kaufman

Jerome A Thompson

Frank Mikic

Norbert J Kot

Nancy C Rittmann

Theodore H Kunkel, Jr

Frank W Randle

Norbert C Neumann

Ralph H Mueller

Jeffery A Stafford

David J Draeger

A power drive assembly is provided for an elongated turn buckle-type cable tightener having an elongated sleeve with a driven gear wheel on it, and two loop-defining cable and anchors respectively threadedly engaged in its opposite ends. A drive unit is adapted to be coupled to the sleeve and has a motor-driven gear engageable with the driven gear for rotating the sleeve. Two right-angle reaction bars couple the frame of the drive unit to the cable anchors each reaction bar having one end slidably received in openings in the drive unit frame and another and received through the loop of the associated cable anchor.

Barge ratchet driver with reaction bars

A power drive for an elongated cable tightener having an elongated sleeve and a driven gear wheel supported on the sleeve is provided. The drive includes an outer frame having connected, and laterally spaced, elongated first and second outer side members, each outer side member having first and second ends, the second ends defining aligned outer notches opening longitudinally outward. The drive also includes an inner frame disposed between the first and second outer side members and supported thereby for movement between engaged and open positions, the inner frame having connected and laterally spaced first and second inner side members, each inner side member having first and second ends, the second ends defining aligned inner notches opening laterally outward of the side members, wherein when the inner frame is in the engaged position the inner notches are aligned with the outer notches whereby the sleeve may be disposed in both the inner and outer notches. The drive further includes a drive gear carried by one of the inner and outer frames and engageable with the driven gear to rotate the driven gear, and an actuator coupled to the drive gear for rotating the drive gear.

Power drive for cable tightener

The tool includes a housing and a pair of forwardly projecting tubes respectively containing slidably mounted rods, one for use in tensioning a lock wire and the other for use in crimping a ferrule onto the lock wire. Camming structure moves the rods forwardly and rearwardly. First, the tensioning rod snaps back under the control of a spring to tension the wire. Then, the ferrule is crimped by forward movement of the other rod.

Tensioning and crimping tool

The tool is a pliers or cutters having two members that are pivotally joined. The portions of the members on one side of the joint define cutter jaws or plier jaws as the case may be. On the other side of the joint, the members define handles located on the same side of the jaw axis. The rear handle has a first section nearest its associated jaw extending away from the jaw axis at an acute angle, and a second section extending from the first section at an obtuse angle. The other handle also has two sections, the first section nearest the jaws having a slight curvature and the second section having a curvature which is convex outwardly and is more pronounced than that of the first section.

Ergonomic tool

A torque wrench having a torque plug integral with the back side of the torque wrench handle and with strain sensing elements mounted on the torque plug and connected to signal processing circuits supported by the handle which control a digital display unit mounted on the handle. The processing circuits include a peak hold detector enabling display of the peak torque value during a torquing operation, and a peak hold response delay insuring capture of the peak torque value.

Torque measuring apparatus

An engine timing apparatus includes a piezoelectric transducer and a device for mechanically coupling it to a fuel injector body of the engine. A 6-inch clamping-type pliers is clamped to the injector body. A metal housing is fastened to the pliers at the jaw pivot, the housing having a cylindrical side wall and a circular bottom wall in positive contact with the pliers. The transducer is supported in a recess in a rubber sleeve in the housing and cooperates with the housing to define a resonant chamber at substantially 40 Khz. The dimensions of the pliers are such that the ultrasonic acoustic emissions of the injector body induce in the pliers a standing wave at substantially 40 Khz or a harmonic thereof, the jaw pivot being disposed substantially at an antinode, or point of maximum displacement, of the standing wave. The housing above the transducer is filled with an acoustically insulating foam and covered with a plastic cap.

Transducer and holder therefor for ultrasonic acoustic tachometer

The adapter includes a luminosity probe for replacing the glow plug associated with the selected cylinder in a diesel engine, a timer circuit responsive to inception of each electrical signal generated by the luminosity probe to produce a timer signal. The timer signal is differentiated to produce a spike. A pickup loop receives the spike and produces an inductive signal for application to the clip of a spark-ignited-engine timing meter.

Adapter for converting luminosity signals into inductive signals

The probe includes an elongated body having a reduced diameter portion at the front thereof. A light-transmitting tube is located in the bore of the body and abuts against the shoulder defined by the reduced diameter portion. A microwave conductor in the tube protrudes from the front end. A plastic tubular shield is located at the rear end of the body and is held in place by a sleeve encompassing both shield and the body.

Dual engine probe

The luminosity probe includes an elongated tubular member having a bore extending therethrough. Within the bore is a light pipe having a diameter less than the diameter of the bore so as to create an annulus therebetween. Such annulus is filled with epoxy.

Luminosity probe with positively retained light pipe

The adapter includes a housing containing a rectifier for supplying flash voltages to an LED. The rectifier rectifies inductive signals derived from an inductive pickup. The adapter can be used to enable a spark-ignited engine calibrator to calibrate a diesel-engine-timing meter by converting the inductive electrical signals from the calibrator to light signals for the diesel timing meter. The adapter also can be used to enable a diesel-engine-timing meter and analyze and time a spark-ignited engine by converting the inductive pulses derived from a spark plug wire into light impulses for the diesel-engine-timing meter.

Adapter for diesel-engine-timing meter

Hammer

The probe includes a tubular housing having a first portion and a second portion. The first portion is adapted to be mounted in place of the glow plug of a selected engine cylinder. A light pipe within the first portion directs light from the combustion zone to a phototransistor within the second portion. The front of the first portion has a reduced size aperture defined by an internal shoulder against which the front of the light pipe is seated. The rear of the first portion carries resilient sealing means which is deformed when the second portion is telescoped thereon so as to provide a detachable, frictional, light-tight thermally insulated connection therebetween. A phototransistor is mounted within the second portion to convert light passing through the light pipe into electrical signals. A cable carries these electrical signals to processing equipment. A base resistor is located in the second portion between the base of the phototransistor and the cable. The part of the first portion that projects from the engine is short with respect to the part that fits into the engine. The projecting portion carries wrench-engaging bosses.

Luminosity probe for diesel engine timing apparatus

A first signal at a first frequency which is a selected harmonic of the resonant frequency of a bolt in a first loaded condition is determined. Then there is determined a second signal at a second frequency being the same harmonic of the resonant frequency of the bolt in a second loaded condition. Both frequencies are multiplied by a factor M. The up input of a counter receives one of the signals for a predetermined duration, and the down input receives the other signal for the same duration. The number of pulses remaining in the counter is representative of the difference in load between the first and second loaded conditions.

Bolt load determining apparatus

The apparatus comprises a luminosity probe to provide an electrical signal in response to the combustion event in a diesel engine and also comprises a probe to provide another electrical signal indicative of top dead center. Both electrical signals are processed and applied to a circuit which generates an output pulse having a duration corresponding to the time between the start of the electrical signals. A meter displays the angle represented by the duration of such pulse. Circuitry is provided to compensate for offset.

Diesel engine timing apparatus

A pickup probe for engine timing which is responsive electrically to an indicator on a rotating engine part. The free end of the probe is adapted to extend through an access opening in an engine member into proximity with the indicator on the rotating engine part. A sensor is contained within the free end portion of the probe. The probe includes a mounting means adapted to be detachably secured to the engine member adjacent the aforesaid access opening. The free end of the probe has limited longitudinal movement with respect to the mounting means so as to accommodate dimensional irregularities in the engine and enable the free end of the probe to be moved in adjusting manner to a selected longitudinal position with respect to the rotating part indicator to establish an effective air gap, and means are provided to maintain the free end of the probe in the selected position, thereby insuring continued proper spacing of the sensor and indicator by the effective air gap and the generation of timing signals of high quality for processing in associated equipment.

Growing community of inventors

Kenosha, WI, United States of America

Donald D Grover