Abrading – Frame or mount – Portable abrader
Reexamination Certificate
1999-09-09
2001-02-13
Banks, Derris H. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S360000, C451S344000
Reexamination Certificate
active
06186879
ABSTRACT:
This invention relates to a rotary power tool of the type having a housing with a tubular extension, a rotation motor located in the housing, and an output shaft drivingly connected to the motor.
In particular, the invention concerns a rotary power tool of the above type in which the output shaft comprises a first section journalled in the housing by means of two axially spaced bearings, a second section journalled in the tubular extension by a single bearing only located at the outer end of the tubular extension, and a connection device for drivingly interconnecting the first and second shaft sections.
Previous tools of this type are described in U.S. Pat. Nos. 3,410,030 and 3,591,989.
In the power tool shown in U.S. Pat. No. 3,410,030, FIG. 8, the output end of the motor is drivingly connected to an extended output shaft via a spline coupling. Apart from being rather expensive to manufacture, this type of splined connection is not able to provide an accurate enough radial support for the inner end of the output shaft. Thereby, there is a risk for an untrue rotation of the latter and, accordingly, vibrations to be caused at high speed operation.
As mentioned above, one problem inherent in the shaft connections of many prior art power tools of this type is a poor radial support of the inner end of the output shaft extension. Another problem, however, comes up when trying to accomplish a shaft connection which is almost free of radial play, namely how to provide a certain flexibility as regards angle deviations between the shaft sections. Accordingly, it is difficult to obtain a shaft coupling which provides at the same time a playfree radial support and a certain flexibility to angle faults occurring between the two shaft sections. In practice, such faults are inevitable due to tolerance scattering at manufacturing of the tool parts, and to avoid built-in strains in the shaft sections, the bearings and the shaft connection a certain flexibility to angle deviations has to be provided.
A primary object of the invention is to provide a rotary power tool with a shaft connection device which combines an accurate radial support and guidance of the interconnected parts with a certain flexibility to angle faults between the shaft sections.
Other objects and advantages of the invention will appear from the following detailed specification.
REFERENCES:
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patent: 236816 (1945-07-01), None
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patent: 591661 (1947-08-01), None
patent: 658278 (1951-10-01), None
patent: 122820 (1948-09-01), None
Atlas Copco Tools AB
Banks Derris H.
Frishauf, Holtz Goodman, Langer & Chick, P.C.
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