Abrading – Accessory – Guard or housing
Patent
1997-12-03
2000-07-18
Banks, Derris Holt
Abrading
Accessory
Guard or housing
451453, 451455, B24B 5504
Patent
active
060899646
ABSTRACT:
A grinding wheel shield for a semiconductor wafer edge grinding machine formed with a flat upper surface having a central aperture therein for accommodating the grinding wheel shaft and motor of the grinding machine on which the shield is installed, an open keyway slot leading from the central aperture to an adjacent edge of the shield, a depending flange extending from at least a portion of the periphery of the upper surface, and at least one positioning member projecting from the depending flange, the shield being a unitary member machined from a single block of resilient polymeric material, and a sheet of resilient material disposed on top of the flat upper surface with an opening aligned with the central aperture of the shield and a slit extending from the opening over the keyway slot to the edge of the shield such that the sheet forms at least one flexible flap over the keyway slot.
REFERENCES:
patent: 4864779 (1989-09-01), Ozaki
patent: 5185965 (1993-02-01), Ozaki
Banks Derris Holt
SEH America Inc.
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