Grinding tool for sharpening work pieces

A hand-held grinding tool for sharpening a work piece comprising:

• an oscillatory drive having a drive shaft which is driven oscillatingly about a longitudinal axis thereof;
• a holder for mounting a working part being configured as a grinding plate having a flat grinding surface;
• a fixed holding section provided on said holder and a removable clamping part provided on said holder for clamping said working part at one end thereof between said fixed holding section and said removable clamping part;
• and
• at least one tensioning part for fixing said working part between said fixed holding section and said removable clamping part of said holder in a position so that said grinding surface extends in a plane substantially perpendicularly to said drive shaft;
• wherein said clamping part comprises an outer surface which serves as a guide surface for supporting a surface of said work piece to define a predetermined angle between said surface of said work piece and said grinding surface of said working part when guiding said grinding tool along said surface of said work piece for sharpening said work piece;
• wherein said grinding tool comprises a plurality of different clamping parts designed for different predetermined angles and being exchangeable so as to allow a setting of the predetermined angle.

A holder in a grinding tool for sharpening a work piece using a hand-held oscillatory drive having a drive shaft which is driven oscillatingly back and forth about a longitudinal axis thereof, wherein:

• said holder is configured for mounting a working part to said drive shaft of said oscillatory drive, said working part being configured as a grinding plate having a flat grinding surface;
• said holder comprises a fixed holding section and a removable clamping part for clamping said working part at one end thereof between said fixed holding section and said removable clamping part;
• said holder comprises at least one tensioning part for fixing said working part between said fixed holding section and said removable clamping part of said holder in a position so that said grinding surface extends in a plane substantially perpendicularly to said drive shaft;
• wherein said clamping part has a generally triangular cross section comprising an outer surface which serves as a guide surface for supporting a surface of said work piece to define a preset angle between said surface of said work piece and said grinding surface of said working part when guiding said grinding tool along said surface of said work piece for sharpening said work piece;
• and
• wherein said preset angle is between 10° and 40°.

A hand-held grinding tool for sharpening a work piece comprising:

• an oscillatory drive having a drive shaft which is driven oscillatingly back and forth about a longitudinal axis thereof;
• a holder for mounting a working part being configured as a grinding plate having a flat grinding surface;
• a fixed holding section provided on said holder and a removable clamping part provided on said holder for clamping said working part at one end thereof between said fixed holding section and said removable clamping part;
• at least one tensioning part for fixing said working part between said fixed holding section and said removable clamping part of said holder in a position so that said grinding surface extends in a plane substantially perpendicularly to said drive shaft;
• wherein said clamping part has a generally triangular cross section comprising an outer surface which serves as a guide surface for supporting a surface of said work piece to define a predetermined angle between said surface of said work piece and said grinding surface of said working part when guiding said grinding tool along said surface of said work piece for sharpening said work piece;
• and wherein said grinding surface protrudes beyond said outer surface of said clamping part.