Cutlery – Cutting tools – With blade moving means
Patent
1994-09-28
1995-10-31
Payer, Hivei-Siu
Cutlery
Cutting tools
With blade moving means
56 127, A01D 5000
Patent
active
054617871
ABSTRACT:
A filament-type trimming apparatus comprises a reel case including a main body and a bottom member, a cord reel housed in the reel case and which is wound with a nylon cord, plural stoppers on a lower surface of the cord reel and on an inside of the bottom member and which become engaged when the cord reel is pressed downward by a coil spring, a mechanism for releasing a centrifugal force of the cord reel and which is provided between the cord reel and the bottom member and which comprises radial guide grooves and balls arranged inside the guide grooves, and plural stoppers on an upper surface of the cord reel and on an inner surface of the reel case respectively and which become engaged when the cord reel is pressed upward resisting against the pressing force of the coil spring. A boss is provided inside the reel case main body at its center and to which the coil spring is fixed. Plural positioning projections are provided outside the boss in a direction of rotation at a predetermined intervals, the positioning projections each having a height graduated with respect to one another. A rotatable spacer member is interposed between the positioning projections and the coil spring. A predetermined pressing force of the spring is maintained to enable a smooth trimming operation even when an engine output and reduction ratio differ from one apparatus to another.
REFERENCES:
patent: 4169311 (1979-10-01), Evenson et al.
patent: 4259782 (1981-04-01), Proulx
patent: 4566189 (1986-01-01), Muto
patent: 5095688 (1992-03-01), Fabrizio
patent: 5222301 (1993-06-01), Sugihara et al.
Araki Minoru
Miyama Shinichi
Payer Hivei-Siu
Tanaka Kogyo Co., Ltd.
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