Magnetic safety clutch for rotary lawnmower

Details Magnetic safety clutch for rotary lawnmower Magnetic safety clutch for rotary lawnmower

1980-06-05

1981-10-20

Hirsch, Paul J.

Harvesters

Motorized harvester

With selective control of drive means

56DIG15, A01D 7520

Patent

active

042953278

ABSTRACT:
A deadman-type hand switch mounted on a rotary lawnmower handle actuates a magnetically coupled clutch drive to couple the rotary blade to the lawnmower drive shaft. Release of the hand switch removes the magnetic force holding the clutch members together and actuates a mechanical brake to stop the rotation of the blade. Gravity and the brake's action assist in physically decoupling the clutch members.

REFERENCES:
patent: 2985992 (1961-05-01), Dowdle
patent: 3160128 (1964-12-01), Heidt
patent: 3677377 (1972-07-01), Miller
patent: 3773156 (1973-11-01), Nyquist
patent: 3841069 (1974-10-01), Weck
patent: 3999643 (1976-12-01), Jones
patent: 4044533 (1977-08-01), Wick
patent: 4205509 (1980-06-01), Miyazawa et al.
patent: 4226313 (1980-10-01), Meldahl et al.

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