Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1986-06-06
1988-05-17
Parker, Roscoe V.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
B24B 2304
Patent
active
047441771
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a vibratory or oscillatory sander grinder or abrader having a grinding plate which is supported at the housing by way of elastic elements, with the grinding or abrading plate being put into an orbital movement by way of a ball bearing attached to an eccentric drive member which is equipped with a compensating weight and can be caused to rotate by the armature shaft of the drive motor.
2. The Prior Art
In known vibratory grinders or oscillating sanders of this type, the eccentric drive member including its compensating weight is fixed to the armature shaft of the drive motor. The swing of the eccentric drive member is here defined and unchangeable. For that reason and depending on the design of its eccentric swing and possibly its number of revolutions, such a vibratory grinder is suitable either specifically for rough grinding (abrading) work or preferably for fine grinding work. Therefore, two vibratory grinders with generally different eccentricities and numbers of revolutions are used for rough and fine grinding work.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a vibratory abrader such as a vibratory grinder which, by simply changing its eccentric stroke, is suitable to the same degree for rough as well as fine grinding work.
This is accomplished according to the invention in that the eccentric drive member is drive by means of an eccentric pin which is likewise mounted eccentrically with respect to the axis of the armature shaft and the armature shaft is pivotal relative to the eccentric drive member and its compensating weight, with the angle of rotation between the armature shaft and the eccentric drive member in both directions being limited to 180.degree. by corresponding abutments at the armature shaft and at the eccentric drive member, and an additional compensating weight is associated with the compensating weight of the eccentric drive member, with this additional compensating weight likewise being rotatable about 180.degree. relative to the compensating weight.
Modifications and suitable features of the invention are defined in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described below with reference to the drawings which depicts preferred embodiments.
The embodiments are shown in:
FIG. 1, a side view, partially in section, of a vibratory grinder in which the eccentricity "r" of the eccentric drive member is defined by the position of the armature shaft relative to the eccentric drive member and the compensating weight;
FIG. 2, a top view of the compensating weight;
FIG. 3, a view of the lower portion of the armature shaft and its abutment which limits the rotary position of the eccentric drive member relative to the armature shaft;
FIG. 4, a side view of the vibratory grinder corresponding to FIG. 1, but with an eccentric drive member compensating weight unit which is rotated by 180.degree. with respect to the eccentric shaft;
FIG. 5, a side view of the eccentric drive member where the additional compensating weight is rotatably mounted in the additional weight of the eccentric drive member;
FIG. 6, a top view of the eccentric of FIG. 5;
FIG. 7, a detail view, partially in section, of the armature shaft with the eccentric pin and the eccentric drive member during rotation of the armature shaft to the left and;
FIG. 8, a detail view corresponding to FIG. 7, but with the armature shaft moving to the right.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As can be seen in FIGS. 1 and 4, the drive motor 5 is disposed vertically in a vibratory grinder housing 4 which is equipped with a handle 2 and a handhold 3. The armature shaft 1 of the motor has a bore 6 which is eccentric to its longitudinal axis 1' and an eccentric pin 7 is rotatably mounted in this bore so as to be secure against axial displacement. The securing of the eccentric pin against falling out of the bore 6 in the armature shaft may here be realized by a circlip 8 or a similar element.
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REFERENCES:
patent: 1445857 (1923-02-01), Stevens
patent: 3533193 (1970-10-01), Dudek et al.
patent: 3874125 (1975-04-01), Stroezel
Braun Roland
Kaiser Bernd
Stammele Siegfried
Licentia Patent-Verwaltungs-GmbH
Parker Roscoe V.
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