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Flap-type rotary abrasive device

  • US 4,448,590 A
  • Filed: 10/17/1980
  • Issued: 05/15/1984
  • Est. Priority Date: 05/30/1978
  • Status: Expired due to Term
First Claim
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1. A method of fabricating a flap-type rotary abrasive device comprising an annular array of abrasive leaves having opposite side edges and base edges, said annular array having an inner surface formed by said base edges facing radially inward, each leaf having abrasive particles bonded to at least one face thereof, comprising the steps of:

  • providing a plurality of leaves of flexible material, each leaf having abrasive particles bonded to at least one face thereof;

    arranging the plurality of leaves in a stack so that a face of each leaf having abrasive particles faces in one direction;

    subjecting the stack to high compression substantially perpendicular to the leaf faces to cause successive leaves of the stack to adhere to one another by penetration of abrasive particles of each leaf into an adjacent leaf, thereby transforming the stack of leaves into a rigid block;

    forming at least one straight line groove in the rigid block, the groove being substantially perpendicular to a base edge of each leaf;

    filling said groove with a deformable adhesive;

    loosening the leaves from face to face adherence to each other, each leaf defining a leaf of said array, the array of leaves being interconnected by said deformable adhesive at said base edges;

    forming said loose array into a circular configuration defining a central bore the boundary of which is determined by said base edges;

    providing two centrally disposed end caps one at each end of said bore, each end cap forming an annular passageway around the side edges adjacent to said base edges of the leaves, said passageway having at least one access aperture into said central bore;

    disposing a spindle centrally of said bore; and

    inserting a settable securing material having a liquid and a solid state into said central bore while in a liquid state to substantially fill said bore and flow through said access aperture and said annular passageways into contact with the side edges adjacent the base edges of said leaves so that said material penetrates slightly between said leaves at the side edges thereof adjacent said base edges, said securing material becoming solidified subsequent to insertion.

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