Importance

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Abstract

A concrete saw is provided which utilizes a transmission having both forward and reverse, high and low speed ranges separated by a neutral state. The transmission includes a neutral start switch which prevents the engine from being started, while the transmission is in gear. An automatic parking brake assembly is mounted to the frame proximate the drive wheel. The brake assembly fixedly engages the drive wheel when the ignition switch is turned to the off position, when the battery is disengaged or when the battery is dead. The brake assembly also immobilizes the drive wheel whenever the transmission is shifted to the neutral state regardless of the position of the ignition switch. The system is provided with an override switch to bypass the automatic application of the brake assembly when the transmission is placed in neutral to facilitate winching or otherwise rolling the saw without engine power. Normally, the brake assembly disengages when the transmission is shifted from neutral into gear. Even when the brake override switch is activated, the brake is automatically engaged when the engine ignition switch is turned off or the emergency override switch is activated. The brake is disengaged only when the engine start switch is turned on. An override switch is provided which, when applied, stops the engine, blade and engages the parking brake. An electrically controlled hydraulic system for raising and lowering the saw blade is rendered inoperative when the engine start switch is turned to the off position or when the battery fails.

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First Claim