Eccentric grinding hand power tool

• US 7,077,734 B2
• Filed: 10/07/2004
• Issued: 07/18/2006
• Est. Priority Date: 10/10/2003
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Weninger, Dieter, Tiede, Steffen
• Primary Examiner(s): ACKUN, JACOB K
• Application Number:
  US10/960,729
• Publication Number:
  US 20050079808A1
• Time in Patent Office: 649 Days
• Field of Search: 451/353, 451/357, 451/359, 451/354, 451/351, 451/350
• US Class Current: 451/357
• CPC Class Codes: B24B 23/04 with oscillating grinding tools; Accessories therefor

Abstract

An eccentric grinding hand power tool has a housing, a grinding plate unit supported on the housing and being eccentrically driven, an elastic seal that dust-tightly seals the housing with respect to the grinding plate unit, the elastic seal being held on the housing both in a form-locking, positive manner and in a force-transmitting, non positive manner without separate elements but with integrated securing elements.

Claims

1. An eccentric grinding hand power tool, comprising a housing;

a grinding plate unit supported on said housing and being eccentrically driven;

an elastic seal that dust-tightly seals said housing with respect to said grinding plate unit, said elastic seal being held on said housing both in a form-locking positive manner and in a force-transmitting, non positive manner with integrated securing elements and without separate elements, wherein said elastic seal is formed as a corrugated membrane which on its outer edge has an axially extending seat collar, said seat collar having a shape and a size corresponding to a negative shape of at least one axial projection of a holding side of said housing and smaller dimension than said projection, so that said seat collar is pullable on said holding side only being stretched and is holdable on it automatically in a force-transmitting, non-positive manner.

2. An eccentric grinding hand power tool as defined in claim 1, wherein said corrugated membrane in a region of said seat collar has projections engageable in radial projections formed in a ring groove of a collar of said holding side in a housing cover.

4. An eccentric grinding hand power tool as defined in claim 1, wherein said elastic seal is formed as a corrugated membrane having a central hole with an edge;

and further comprising a hard-elastic inner seat ring supported on said edge and forming an inner seat of a radial corrugated sealing ring.

5. An eccentric grinding hand power tool as defined in claim 1;

and further comprising a housing cover which covers said housing from below and has a side that faces said grinding plate unit and carries a corrugated membrane that forms said seal said grinding plate unit having an eccentric transmission with parts mounted on a side of said housing cover which faces an angle transmission.

6. An eccentric grinding hand power tool as defined in claim 1;

and further comprising an edge seal which covers and intermediate space between said grinding plate unit and said bell with a predetermined gap for limiting a negative pressure in the intermediate space, radially outwardly, said edge seal being elastic and engaging in a form-locking, positive manner into an inner ring groove of said bell.

7. An eccentric grinding hand power tool as defined in claim 6, wherein said edge seal has a sealing edge which faces axially toward an upper side of said grinding plate unit and forms said predetermined gap.

8. An eccentric grinding hand power tool as defined in claim 7, wherein said edge seal has air openings which are uniformly spaced from one another and operating for limiting a negative pressure in said intermediate space.

3. An eccentric grinding hand power tool, comprising a housing;

a grinding plate unit supported on said housing and being eccentrically driven;

an elastic seal that dust-tightly seals said housing with respect to said grinding plate unit, said elastic seal being held on said housing both in a form-locking positive manner and in a force-transmitting, non positive manner with integrated securing elements and without separate elements, wherein said elastic seal is formed as a corrugated membrane composed of a soft elastic material and on its outer edge is provided with elongated stretching openings arranged in uniform distances, for increasing an elasticity of said corrugated membrane in a region of its seat collar.