Caterpillar Tractor Co.

Other

Gary N Heitzman

Robert G Miller

Clay L Hutchings

Gary L Knepp

Norma G Shook

Caterpillar Tractor Co

A solenoid-operated fuel valve opens automatically when the engine is started to allow fuel to flow from a fuel tank to the engine and closes automatically when the engine throttle is moved to fuel-off position to shut down flow of fuel through the governor for the engine. In the event of an emergency, operation of a manual shutdown control will de-energize the fuel valve solenoid to shut off flow of fuel to the engine compartment and will also shut down the engine by energizing a solenoid to move the fuel rack for the governor to fuel-off position. Actuation of a fire-extenguisher system for the engine will automatically de-energize the fuel-valve solenoid and energize the fuel-rack solenoid. The fuel-rack solenoid remains energized for a timed period sufficient to ensure engine shutdown in emergency situations. Control circuits are provided to ensure that current to each of the solenoids is reduced to a low holding level after initial energization and pull-in of the solenoids and are also provided to protect against damage from excessive current in the event either solenoid is shorted.

Engine and fuel shutdown control

A solenoid-operated fuel valve opens automatically when the engine is started to allow fuel to flow from a fuel tank to the engine and closes automatically when the engine throttle is moved to fuel-off position to shut down flow of fuel through the governor for the engine. In the event of an emergency, operation of a manual shutdown control will de-energize the fuel valve solenoid to shut off flow of fuel to the engine compartment and will also shut down the engine by energizing a solenoid to move the fuel rack for the governor to fuel-off position. Actuation of a fire-extinguisher system for the engine will automatically de-energize the fuel-valve solenoid and energize the fuel-rack solenoid. The fuel-rack solenoid remains energized for a timed period sufficient to ensure engine shutdown in emergency situations. Control circuits are provided to ensure that current to each of the solenoids is reduced to a low holding level after initial energization and pull-in of the solenoids and are also provided to protect against damage from excessive current in the event either solenoid is shorted.

A composite 'U' joint guard-step has a first member and a second member. A first assembly is provided for releaseably maintaining the first member in substantial mating alignment to the second member. A second assembly is provided for maintaining the second member at a preselected position relative to a 'U' joint. The first member has first and second flanges and a middle portion and is of an elongated channel and inverted 'U' configuration. The middle portion is generally planar and generally horizontal to provide a step for an operator. The first member is of a configuration sufficient for extending over and being spaced from the 'U' joint. The second member has first and second flanges and is of elongated channel configuration. The second member is of a size sufficient for mating with the first member at the first and second flanges, while being spaced from the 'U' joint. In combination with the first member, the first and second members encompass the 'U' joint.

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Washington, IL, United States of America

Gary N Heitzman