Owatonna Tool Company

Daniel L Doss

Dan O Morris

Robert J Hoevenaar

David P Shock

James C Solie

Jerald Lee Waldrop

Robert A Melander

A method of and an instrument for testing a breakerless ignition system for an internal combustion engine. The instrument, a self-contained portable unit, is coupled to the breakerless ignition system and several reference voltages are established. The voltage from the battery of the ignition system is compared with one of the reference voltages and an indication is provided if the voltage from the battery is sufficient to operate the breakerless ignition system. The DC voltage provided to the coil of the breakerless ignition system is compared to two established reference voltages and an indication is provided if the DC voltage provided to the coil is within an established range. Also, the width of the pulses to the coil, which pulses are ultimately used to generate the spark for the internal combustion engine, is measured and an indication is provided if the width of the pulses is sufficient to sustain a spark. A simulator circuit is provided to simulate a signal representative of the signal obtained by the rotation of a timing cam as the timing cam traverses a magnetic sensor.

Instrument for testing a breakerless ignition system

A portable timber felling device for controlled felling of a tree including a hydraulic ram unit positionable in a backcut of the tree for extension therein to fell the tree. A hydraulic power unit includes a pump and control valves to generate and regulate the hydraulic power required to operate the hydraulic ram unit. A hose means of a considerable length interlinks the power and ram units for the transmission of the generated hydraulic power. A remote control unit with a manually operable control member controls at least one of the valves on the power unit via a communication means which places the operator of the remote control at a substantial distance from the power unit and the tree to be felled. The entire structure is portable and a battery provides the electrical power for remote control.

Timber felling device

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Owatonna, MN, United States of America

Daniel L Doss