Lapping fixture reference plate assembly

• US 3,898,770 A
• Filed: 11/25/1974
• Issued: 08/12/1975
• Est. Priority Date: 11/25/1974
• Status: Expired due to Term

• Current Assignee: Ernest A. Benz, James V. Keefe
• Original Assignee: Ernest A. Benz, James V. Keefe
• Inventors: Benz, Ernest A., Keefe, James V.
• Primary Examiner(s): Simpson, Othell M.
• Application Number:
  US05/526,612
• Time in Patent Office: 260 Days
• Field of Search: 51/125,129,131
• US Class Current: 451/286
• CPC Class Codes: B24B 37/102 the workpieces or work carriers being able to rotate freely due to a frictional contact with the lapping tool
• CPC Class Codes: B24B 49/02 according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent B24B49/12 takes precedence
• CPC Class Codes: C07D 219/12 Amino-alkylamino radicals attached in position 9

Abstract

The reference plate assembly includes a horizontal reference plate having three circumferentially spaced apart vertical apertures. Insert units are vertically adjustably mounted in the apertures with the plane of the upper ends of the insert units lying below the plane of the upper surface of the plate and parallel to the plane of the lower surface of the plate. One reference plate assembly may be used interchangeably with any number of cooperating fixtures; any number of reference plate assemblies may be used interchangeably with one cooperating fixture.

Claims

1. For use in lap limiting fixture means, a reference plate assembly comprising a horizontal reference plate having an upper surface, a lower workpiece engaging surface, and three circumferentially spaced apart vertical apertures open at their upper ends;

and insert units vertically adjustably mounted in said apertures with the plane of the upper ends of said insert units lying below the plane of said upper surface and parallel to the plane of said lower workpiece engaging surface.

2. The reference plate assembly of claim 1 wherein said apertures are provided with internal threads, and said insert units are provided with external threads threadingly engaged with said internal threads.

3. The reference plate assembly of claim 2 wherein said insert units each comprise a main body provided with said external threads, and a hardened insert secured in the upper end of said main body.

4. The reference plate assembly of claim 3 wherein said reference plate is formed with recessed annular shoulders about said apertures, and including lock nuts threaded on said main bodies below the plane of said upper surface and engaged with said recessed annular shoulders.