| 摘要 |
A "dead man" control mechanism for controlling the propel and tiller drive of a walk-behind rotary tiller includes a flexible control element which extends between and has opposite ends looped about respective Z-shaped crank portions of a control rod and of a belt drive idler pulley arm. When the control rod is operator-held in a drive-engage position, wherein a grip portion of the control rod is gripped together with a grip portion of a handle of the tiller, the control element is tensioned such as to hold an idler pulley, carried by the idler arm, in slack-removing engagement with a slack run of a belt trained about drive and driven pulleys. Upon the operator releasing the grip portion of the control rod, the latter gravitates to a drive-disengage position wherein the control element is slackened such as to permit the idler pulley to move to permit the slack run of the drive belt to slacken to the extent that torque is no longer transferred between the drive and driven pulleys.
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