Clutch controlled drive unit

Details Clutch controlled drive unit Clutch controlled drive unit

1984-02-27

1985-12-10

Leppink, James A.

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Pulley shifter

474119, 474121, 474133, 474139, F16H 714

Patent

active

045577102

ABSTRACT:
A drive unit preferably employed with a self-propelled lawn mower for driving at least one pair of wheels of the mower. An axle pulley is fixed on the axle of the drive wheels and a directional pulley is rotatably mounted above and in a spaced apart relation to the axle pulley. A drive belt is trained over an upper portion of the directional pulley and about a lower portion of the axle pulley and is then trained about an upper portion of a directional roller. The drive unit has a drive condition and an idle condition in which a portion of the drive belt, between the directional roller and the axle pulley, is in a generally vertical run. An idler roller is mounted on lever arms having an axis of rotation coaxial with that of the directional roller and is positioned below and in a spaced apart relationship to the directional roller so that when the lever arms are pivoted about their axis, the idler roller engages the drive belt and increases the contact between the drive belt and the axle pulley to place the drive unit into an operating condition.

REFERENCES:
patent: 2827804 (1958-03-01), Wolfenden et al.
patent: 4036070 (1977-07-01), Knight
patent: 4324552 (1982-04-01), Boushek et al.
patent: 4457086 (1984-07-01), Bacon

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