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US 4,727,682 AGranted
Eccentric grinder with a device for changing a grinding motion
AssigneeRobert Bosch GmbH
InventorsManfred Stabler, Walter Barth
Life of this patent
Estimating the term…
Abstract
An eccentric grinder is provided with a device for changing a grinding motion. The grinder includes a grinding disc eccentrically positioned on a driving shaft and supporting an internal and an external toothed crowns which are brought to a rolling motion on respective external and internal toothed crowns supported on the housing of the grinder. The toothed crowns supported on the housing are axially displaceable by a handle provided externally of the housing. Three various grinding motions for coarse, medium and fine grinding can be obtained by the drive of the grinder.
Claims12
In an eccentric grinder comprising a housing;
- a driving shaft having an axis;
- a grinding disc positioned in said housing eccentrically relative to said shaft;
- a pure eccentric drive for driving said disc from said shaft;
- and a device for changing a grinding movement of said grinding disc, said device including drive means for said grinding disc, said drive menas including a first crown means positioned rotationally on said driving shaft and eccentrically relative to said driving shaft, and a second crown means engageable with said first crown means for forcible rolling movement thereon and positioned in said housing concentrically with said driving shaft, the improvement comprising said grinding disc supporting said first crown means which include an internal crown (17/39) and an external crown (18/40), said housing supporting said second crown means (20/21, 37/38) which include an internal crown (21/38) engageable with said external crown (20/37) engageable with said internal crown (17/39) of said first crown means, said internal crown and external crown of said first crown means being offset relative to each other along the axis of said driving shaft, and said internal crown and external crown of said second crown means being displaceable along the axis of said drive shaft so as to establish or release a drive connection between said first and second crown means.
1 more element
In an eccentric grinder comprising a housing;
- a driving shaft having an axis;
- a grinding disc positioned in said housing eccentrically relative to said shaft;
- a pure eccentric drive for driving said disc from said shaft;
- and a device for changing a grinding movement of said grinding disc, said device including drive means for said grinding disc, said drive means including a first crown means positioned rotationally on said driving shaft and eccentrically relative to said driving shaft, and a second crown means engageable with said first crown means for forcible rolling movement thereon and positioned in said housing concentrically with said driving shaft, the improvement comprising said grinding disc supporting said first crown means which include an internal crown (17/39) and an external crown (18/40), said housing supporting said second crown means (20/21, 37/38) which include an internal crown (21/38) engageable with said external crown (18,40) of said first crown means and with said external crown (20/37) engageable with said internal crown (17/39) of said first crown means being offset relative to each other along the axis of said drive shaft;
- and means for displacing said internal crown and external crown of said second crown means along the axis of said drive shaft, so as to establish or release a drive connection between said first and second crown means.
2 more elements
In an eccentric grinder comprising a housing;
- a driving shaft having an axis;
- a grinding disc positioned in said housing eccentrically relative to said shaft;
- a pure eccentric drive for driving said disc from said shaft;
- and a device for changing a grinding movement of said grinding disc, said device including drive means for said grinding disc, said drive means including a first crown means positioned rotationally on said driving shaft and eccentrically relative to said driving shaft, and a second crown means engageable with said first crown means for forcible rolling movement thereon and positioned in said housing concentrically with said driving shaft, the improvement comprising said grinding disc supporting said first crown means which include an internal crown (17/39) and an external crown (18/40), said housing supporting said second crown means (20/21, 37/38) which include an internal crown (21/38) engageable with said external crown (18,40) of said first crown means and an external crown (20/37) engagaeable with said internal crown (17/39) of said first crown means, said internal crown and external crown of said first crown means being offset relative to each other along the axis of said drive shaft;
- and means for displacing said internal crown and external crown of said second crown means along the axis of said drive shaft, so as to establish or release a drive connection between said first and second crown means, said first and second crown means formed as toothed crowns, said internal crown of each crown means being an internal toothed crown and said external crown of each crown means crown being an external toothed means.
2 more elements
Dependencies are inferred from the claim text.