Snap-on Tools Corporation

Snap-on Tools Company

Glenn A Kaufman

Donald D Grover

Thomas P Becker

Gene E Olson

Christopher B Stout

Bryan M McGovern

Daniel M Eggert

Theodore J Caron

Mark J Hasenberg

Norbert J Kot

Gerald A Wridt

David A Huebschen

Jeffrey M Arendt

Jerome A Thompson

Walter K Krahenbuhl

Robert J Blair

Robert Downs

Dean A Hoskins

Robert L Schmale

Gerald P McGlinn

Gary J Erdman

Open-end wrench head

Contoured wrench

An interference fit joint is provided and includes a first member having a plurality of internal splines separated by valleys and defining a splined aperture having a first axis. Each of the internal splines has a crest and first and second internal sides and is symmetrical about a plane which includes the first axis. This joint also includes a second member having a second axis and an exterior surface having a plurality of external splines separated by valleys and engageable with the internal splines to form an interference fit therebetween. Each of the external splines has a crest and first and second external sides and is symmetrical about a plane which includes the second axis. The first and second external sides are respectively shaped differently from and engageable with first and second internal sides of adjacent internal splines, there being no engagement at the crests and valleys. An indexable head ratchet wrench employing the joint is also disclosed.

Interference fit joint and method and indexable ratchet wrench utilizing

A tool cabinet is formed without the use of fasteners or weldments by providing back and side panel sections in an integral unit having top and bottom flanges, and separate top and bottom panel sections having attachment flanges adapted to be interfitted with the flanges on the back and side panel unit to form an open-front housing. Three continuous loop frame members are spaced apart front-to-back inside the housing and are adhesively secured to the top, bottom and side panel sections and support drawer assemblies mounted in a front opening. A lock bar guide is adhesively secured to the back panel section and receives a lock bar which is inserted through a notch in the bottom panel section after the housing has been assembled. Adhesive or frictional interengagement may also be used to secure together the flanges of the panel sections. An internal framework comprising a single, wide loop frame member with spaced-apart ribs is also disclosed.

Adhesively bonded tool cabinet and method of assembly thereof

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

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

Growing community of inventors

Kenosha, WI, United States of America

Glenn A Kaufman