Filament-type vegetation trimmer with automatic line sensor

Details Filament-type vegetation trimmer with automatic line sensor Filament-type vegetation trimmer with automatic line sensor

1981-07-30

1982-06-22

Hafer, Robert A.

Harvesters

Motorized harvester

Including cutter yieldably mounted on its drive means

56DIG15, 56295, 30347, 324 71R, A01D 5530

Patent

active

043355684

ABSTRACT:
A filament-type vegetation trimmer has an electric motor, a head rotatable by the motor, and a supply of a filament in the head, with the filament extending from the head, whereby on rotation of the head by the motor the extending filament section can cut vegetation. The trimmer further comprises a circuit for detecting the current consumption of the motor and for generating an actual-value output corresponding thereto, an actual-value generator for generating a set-point output corresponding to the current consumption of the motor when the filament is extending from the head by less than a predetermined distance, and a comparator for comparing these outputs and generating a signal when the actual-value output is less than the set-point output.

REFERENCES:
patent: 3870954 (1975-03-01), Hanson et al.
patent: 4138810 (1979-02-01), Dittinger et al.
patent: 4250623 (1981-02-01), Dittinger et al.
patent: 4270200 (1981-09-01), Lombard

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