LAMINATED GRINDING WHEEL

• US 3,836,345 A
• Filed: 08/09/1971
• Issued: 09/17/1974
• Est. Priority Date: 12/16/1968
• Status: Expired due to Term

• Current Assignee: Richard H. Graham
• Original Assignee: Richard H. Graham
• Inventors: Graham, Richard H.
• Primary Examiner(s): Arnold, Donald J.
• Application Number:
  US05/170,333
• Time in Patent Office: 1,135 Days
• Field of Search: 51/297,298,293
• US Class Current: 51/297
• CPC Class Codes: B24D 11/00 Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
• CPC Class Codes: B24D 5/02 Wheels in one piece
• CPC Class Codes: B24D 7/02 Wheels in one piece

Abstract

A laminated grinding wheel composed of a plurality of plies of universally stretchable creped paper bonded together by means of a thermosetting resin, with layers of abrasive grit particles interposed between adjoining plies of the creped paper, the grit particles being embedded or nested in the gatherings of the creped sheets which effectively stretch and flex to receive the grit particles with essentially negligible puncturing of the creped paper plies as the laminated structure is molded under pressure prior to curing.

Claims

2. The laminated grinding wheel claimed in claim 1 wherein the grit paper plies are arranged so that their grit covered surfaces face outwardly in opposite directions from the center plane of the grinding wheel.

3. The laminated grinding wheel claimed in claim 2 wherein plies of universally stretchable mat paper are interleaved between the plies of grit paper.

4. The laminated grinding wheel claimed in claim 3 wherein the plies of mat paper are treated with a thermosetting resin.

5. The laminated grinding wheel claimed in claim 4 wherein a layer of universally stretchable mat paper is interposed between the centermost two plies of grit paper, whereby to provide three plies of universally stretchable paper in surface-to-surface contact at the approximate center plane of the wheel.

6. The laminated grinding wheel claimed in claim 5 wherein said grit paper has a stretchability both longitudinally and laterally of about 30 percent in each direction, and wherein said grit particles are of 24 grit size.

7. The laminated grinding wheel claimed in claim 6 wherein said sizing resin is a phenol formaldehyde resin and said bonding resin is an unmodified phenol formaldehyde resin containing substantially 65 percent resin and 35 percent cryolite filler, the parts being by weight.