Cutlery – Cutting tools – With blade moving means
Patent
1991-11-22
1993-01-05
Watts, Douglas D.
Cutlery
Cutting tools
With blade moving means
302961, B26B 700
Patent
active
051759322
ABSTRACT:
The invention is directed to a portable handheld tool such as a brushcutter which includes a work tool assembly and a drive motor connected by a drive shaft. The drive shaft is surrounded by a protective tube and is centrally held therein by means of a bearing sleeve unit. The bearing sleeve unit braces itself against the inner peripheral wall surface of the protective tube via outwardly extending support ribs. The bearing sleeve unit defines a bearing bore for holding and guiding the drive shaft within the protective tube. The bearing bore and the drive shaft conjointly define an annular bearing play gap therebetween whereby frictional heat generated in the bearing sleeve unit is reduced while vibrations of the drive shaft are developed and imparted to the bearing sleeve unit. The support ribs are configured so as to be resilient in the radial direction to attenuate the vibrations imparted to the bearing sleeve unit. A plurality of impact ribs extends substantially radially from the outer surface of the center portion for impacting against the inner wall surface in response to the vibrations thereby limiting the amplitude thereof.
REFERENCES:
patent: 3430343 (1969-03-01), Ishizaki et al.
patent: 3977078 (1976-08-01), Pittinger, Jr.
patent: 4226021 (1980-10-01), Hoff
patent: 4236310 (1980-12-01), Muller
patent: 4389203 (1983-06-01), Duntzen
patent: 4551115 (1985-11-01), Ferguson
patent: 4714447 (1987-12-01), Hironaka
patent: 4817738 (1989-04-01), Dorner et al.
patent: 4848846 (1989-07-01), Yamada et al.
patent: 4953294 (1990-09-01), Dohse
Lange Karl-Heinz
Schlessmann Helmut
Trumpf Hans
Andreas Stihl
Ottesen Walter
Payer Hwei-Siu
Watts Douglas D.
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