Title:
【発明の名称】持ち運び可能な作業機械
Document Type and Number:
Japanese Patent JP2927586
Kind Code:
B2
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.
Inventors:
KAARU HAINTSU RANGE
HERUMUUTO SHURESUMAN
HANSU TORUNPU
HERUMUUTO SHURESUMAN
HANSU TORUNPU
Application Number:
JP28790891A
Publication Date:
July 28, 1999
Filing Date:
November 01, 1991
Export Citation:
Assignee:
ANDOREASU SHUTEIIRU
International Classes:
A01D34/68; A01D34/76; A01D34/90; F16C1/06; (IPC1-7): A01D34/76; A01D34/68
Domestic Patent References:
| JP56153133U |
Attorney, Agent or Firm:
Takehisa Ito