Cutlery – Cutting tools – With blade moving means
Patent
1977-02-24
1978-10-10
Peters, Jimmy C.
Cutlery
Cutting tools
With blade moving means
56 127, A01D 5518, B26B 2700
Patent
active
041188640
ABSTRACT:
A filament incremental feed for vegetation filament trimmers of the hollow shaft or similar type in which a free-end of filament is swung as a cutting length from the lower end of the hollow shaft and replaced as worn by pulse feed; the feed includes in a preferred embodiment a vertical spindle mounting a worm pinion coaxially on the hollow-shaft at the top of the hollow shaft. The worm pinion is free to rise and to rotate relative to the spindle when retarded in rotation by friction, as by a friction bar engaging an upward extension of the gear pinion which has a friction surface. Plural spools, in the preferred embodiment, rotationally mounted on substantially horizontal axes on a yoke on the hollow shaft engage the worm pinion with gear teeth around the flanges of the spools. The lead angle of the worm pinion provides a mechanical advantage preventing rotation of the worm gear by the spool geared flanges.
In operation, in the preferred embodiment, downward pull of respective filaments wound on the respective spools caused by centrifugal force at the free cutting-ends of the filaments forces the worm pinion downward against a shoulder and no filament feeds from the spools. To feed filament, the friction bar is engaged with the worm pinion upward extension, causing the worm pinion to rotate in climbing direction relative to the spool geared flanges. This upward unscrewing of the worm pinion ceases when a reduced-diameter section of the upward extension of the worm pinion reaches the level of the friction bar, clearing the friction surface from the friction bar. On retraction of the friction bar the filament pull forces the spools to rotate in feeding direction, feeding filament and forcing the worm pinion down to initial position against the shoulder at which point feed of the filament increment stops. In other embodiments pulse feed is provided by coaction of a worm with spooling means flanges under vibratory urging.
REFERENCES:
patent: 2709323 (1955-05-01), Swan
patent: 2713237 (1955-07-01), Monjar
patent: 2854798 (1958-10-01), DeHaven
patent: 3928911 (1975-12-01), Pittinger
Pittinger, Jr. Charles B.
Pittinger, Sr. Charles B.
McClellan, Sr. John F.
Peters Jimmy C.
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