Abrading – Machine – Sandblast
Patent
1996-11-26
1998-12-08
Morgan, Eileen P.
Abrading
Machine
Sandblast
451 97, B24C 506
Patent
active
058461248
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an improvement of a centrifugal abrasive grain projecting device.
BACKGROUND ART
In some shot-blasting operations to abrade steel plate or other products, the direction in which grains are to be projected must be changed because of changes in the widths or positions of the products. A centrifugal abrasive grain projecting device that is suitable for such operations is disclosed in Japanese Utility Model KOKAI 57-140963 (JP 57-140963, U). The apparatus includes a cover main body covering an impeller, a short, hollow cylindrical body having an axis perpendicular to and rotatably mounted on the external surface of a side wall of the cover main body, a control cage passing through the hollow cylindrical body so as to be inserted into the impeller and that is detachably affixed to the hollow cylindrical body at one end thereof, an introducing tube that is adapted to abut, at a distal end, one end of the control cage via an annular elastic member and that is detachably held between the control cage and a holding mechanism, and a rotational drive mechanism for reversibly rotating the hollow cylindrical body, wherein the direction in which the abrasive grains are projected can be changed by reversibly rotating the control cage via the cylindrical body.
However, in the conventional abrasive grain projecting device of the structure as mentioned above grains enter a portion where the hollow cylindrical body fits in the cover main body, thereby impairing the rotation of the hollow cylindrical body. Thus the device has not been actually realized.
This invention is conceived in light of this fact. It aims to provide an improved abrasive grain projecting device that eliminates the drawback wherein abrasive grains enter the portion where the hollow cylindrical body fits in the cover main body and prevent the hollow cylindrical body from rotating.
DISCLOSURE OF INVENTION
To the above end, the centrifugal abrasive grain projecting device of the present invention includes a cover main body covering an impeller, a short, hollow cylindrical body having an axis perpendicular to and rotatably mounted on the external surface of a side wall of the cover main body, a control cage passing through the hollow cylindrical body so as to be inserted into the impeller and detachably affixed to the hollow cylindrical body at one end thereof, an introducing tube adapted to abut, at a distal end, one end of the control cage via an annular elastic member and that is detachably held between the control cage and a holding mechanism, and a rotational drive mechanism for reversibly rotating the hollow cylindrical body, characterized in that the control cage is rotatably mounted on the hollow cylindrical body via a rolling bearing, and that a rolling body of the rolling bearing is closed on the impeller side by a liner via a filler member and closed on the introducing tube side by a bearing cover via a filler member.
Since the device is thus structured, the liner, bearing cover, and filler members prevent abrasive grains from entering the rolling body of the rolling bearing.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a front view partly in cross section of the first embodiment of the device of the present invention.
FIG. 2 is an elevational view from the right of the device of FIG. 1.
FIG. 3 is a front view partly in cross section of the second embodiment of the device of the present invention.
FIG. 4 is an elevation view from the left of the device of FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
The first embodiment of the present invention will now be explained in detail by reference to the drawings. As in FIG. 1, which is partly in cross section, an auxiliary cover 4 having a central hole 3 is mounted on a right-side external surface of a cover main body 2 which covers an impeller 1. A rolling bearing 5 is fitted in the central hole 3 between an upper and lower race. A short, hollow cylindrical body 6 is fitted in the rolling bearing 5. The cylindrical body 6 has an axis perpendicular to a
REFERENCES:
patent: 4329819 (1982-05-01), May
patent: 4336672 (1982-06-01), Kwolek
patent: 4447993 (1984-05-01), Laido
patent: 4565035 (1986-01-01), Carpenter et al.
patent: 4680899 (1987-07-01), Carpenter et al.
patent: 5024028 (1991-06-01), Pierce et al.
patent: 5209024 (1993-05-01), Carpenter et al.
Rokutanda Hitoshi
Shinke Toshio
Suzuki Hiroaki
Morgan Eileen P.
Sintokogio Ltd.
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