Motor-driven chain saw

Details Motor-driven chain saw Motor-driven chain saw

1986-08-27

1987-07-21

Peters, Jimmy C.

Cutlery

Cutting tools

Saw

83DIG1, B27B 1702

Patent

active

046808620

ABSTRACT:
A motor-driven chain saw is electrically operated by means of a universal motor and has two brake systems operating independently of one another. A mechanical brake system serves as a safety brake and when actuated, the mechanical brake system brings the saw chain to a standstill instantaneously. The second brake system is an electric coasting brake, which when the switch is released stops the saw chain quickly but without recoil. The electrical braking is effected by reversing the polarity of one pole coil of the field winding and short-circuiting it with the rotor winding.

REFERENCES:
patent: 4152833 (1979-05-01), Phillips
patent: 4362196 (1982-12-01), Ferdinand
patent: 4370810 (1983-02-01), Schurr
patent: 4432139 (1984-02-01), Kohler
patent: 4543723 (1985-10-01), Bortfeld
patent: 4573556 (1986-03-01), Andreasson
patent: 4625406 (1986-12-01), Fushiya et al.

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