Eccentric plate grinding machine with a cylindrical housing

• US 6,503,133 B2
• Filed: 06/12/2001
• Issued: 01/07/2003
• Est. Priority Date: 06/29/2000
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Wuensch, Steffen
• Primary Examiner(s): WILSON, LEE D
• Application Number:
  US09/880,153
• Publication Number:
  US 20020106982A1
• Time in Patent Office: 574 Days
• Field of Search: 451/357, 451/294, 451/359, 451/344, 451/358, 451/296, 451/548, 451/526, 451/490
• US Class Current: 451/357
• CPC Class Codes: B24B 23/03 the tool being driven in a combined movement

Abstract

An eccentric plate grinder has a cylindrical housing having a lower region with an end-side edge, a rotatable grinding plate associated with a lower region, a ring-shaped brake positioned between the grinding plate and the edge, the grinding mechanism having an elastic lip with which it is supported on the grinding plate and applies a braking force to the grinding plate, the brake also tightly closing a suction chamber inside the housing in a region of the grinding plate from outside, the brakes having throughgoing openings for ventilating the suction chamber, and further comprising valve-shaped flaps operative for releasing and closing the throughgoing openings.

Claims

1. An eccentric plate grinder, comprising a cylindrical housing having a lower region with an end-side edge;

a rotatable grinding plate associated with a lower region;

a ring-shaped braking means positioned between said grinding plate and said edge, said grinding means having an elastic lip with which it is supported on said grinding plate and applies a braking force to said grinding plate, said braking means also tightly closing a suction chamber inside said housing in a region of said grinding plate from outside, said braking means having throughgoing openings for ventilating said suction chamber; and

valve-shaped flaps operative for releasing and closing said throughgoing openings.

2. An eccentric plate as defined in claim 1, wherein said braking means at a side which faces away from said suction chamber is provided with a circumferential ring groove which reduces a wall thickness, elastic lip extending from said ring groove in an axial direction toward said grinding plate.

3. An eccentric plate as defined in claim 2, wherein said ring groove has a region which is formed as an elastic hinge for a movability of said elastic lip relative to a remaining portion of said braking means.

4. An eccentric plate as defined in claim 1, wherein said braking means has a U-shaped cross-section with legs.

5. An eccentric plate as defined in claim 4, wherein said legs engage around and are held on sides of said lower region of said housing.

6. An eccentric plate as defined in claim 4, wherein said legs engage around and are held on an end side of said lower region of said housing.

7. An eccentric plate as defined in claim 4, wherein said braking means has an inner leg and a further leg which is connected with said inner leg and has a reducing cross-section inclined inwardly and downwardly, said further leg being angled inclinedly outwardly in a region of a ring groove and forming there a lip.

8. An eccentric plate as defined in claim 4, wherein said braking means in a region of an outer leg has a greater outer diameter than said lower region of said cylindrical housing so that it extends beyond an outer contour of said housing and operates as a bumper.

9. An eccentric plate as defined in claim 7, wherein said valve-shaped flaps are formed as throughgoing punched parts and are of one piece with said further leg.

10. An eccentric plate as defined in claim 9, wherein said flaps are formed as U-shaped punched out portions.

11. An eccentric plate as defined in claim 9, wherein said flaps are formed as partially circular punched out portions.

12. An eccentric plate as defined in claim 1, wherein said flaps have mounting regions which are formed as punched-in portions to produce film hinges.