US2618108A

US2618108A - Holder for grinding metallurgical samples

Info

Publication number: US2618108A
Application number: US189211A
Authority: US
Inventors: Frederick E Richardson
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-10-09
Filing date: 1950-10-09
Publication date: 1952-11-18
Anticipated expiration: 1969-11-18

Description

Nov. 18, 1952 F. E. RICHARDSON 2,618,108

HOLDER FOR GRINDING METALLURGICAL SAMPLES Filed Oct. 9, 1950 lmentm fkmm/a f. f/o/flwia/m Patented Nov. 18, 1952 HOLDER FOR GRINDING METALLURGICAL SAMPLES Frederick E. Richardson, Pittsburgh, Pa. Application October 9, 1950, Serial No. 189,211

1 Claim.

The present invention relates to workpiece holders and more particularly to a magnetic holder for handling steel specimens being prepared for metallurgical examination and testing.

In the preparation of a steel specimen for spectrographic analysis or metallographic examination of the surface, it is essential that the surface of the specimen be properly ground or polished before the sample can be accurately tested or examined. Belt-type grinders and polishing discs are most commonly used in such preparation. When a steel sheet or strip is to be analyzed or its surface examined, the usual procedure is to first stamp out a small disc of the material on a punch press and then grind or polish the face of the disc to suit the test to be conducted. Prior to my invention, the handling of the sample while it was being ground or polished presented considerable difiiculties. Various devices, such as magnets, vacuum cups, etc., have been tried in attempts to overcome these difiicul-ties but the results have not been entirely satisfactory.

It is, accordingly, an object of my invention to provide a workpiece holder having magnetic and mechanical means incorporated therein for holding a steel sample flatwise while being ground or polished preparatory to metallurgical testing or examination.

This and other objects will be more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a cross sectional elevational View; and

Figure 2 is an end view, with the workpiece removed, looking toward the work-engaging surface of the holder.

Referring more particularly to the drawings, reference numeral 2 refers generally to the :assembled device of my invention. Reference numeral 4 indicates a cylindrical threaded body having a drilled hole 6 through the center thereof and a plurality of permanent magnets 8 set in holes In in the working end l2 of the cylindrical body 4. The contact ends of the magnets 8 are exposed and are set flush with the end l2 of the cylindrical body. Holes In project into the body 4 parallel to its axis and are radially disposed about the drilled hole 6. A sleeve [4 is provided around the working end I2 of the cylindrical body 4. One end of the sleeve I4 is threaded on the inside as at I6 to match the threads on the cylindrical body 4. The other end of the sleeve is finished smooth on the inside and has an inside diameter of a size to accommodate the diameter of the specimen W to be ground. A lock nut I8 having internal threads 20 is threaded around the outer periphery of the cylindrical body 4 adlacent the sleeve 14. The sleeve [4 and the lock nut I 8 have knurled outer surfaces to permit a firm grip by the operator.

In operation, the cylindrical body member 4, the sleeve l4 and the lock nut l8 are loosely assembled, as shown in Figure 1, and a sample disc W is placed in the sleeve and held securely against the face of the body 4 by the magnets 8. The sleeve is then adjusted so that it overlies the working end 12 of the body 4 but does not overlie the edge of the sample W. The lock nut 18 is tightened to secure this adjustment. The sample disc W is thus securely held during grinding, side movement being restrained by the sleeve l4 and the magnets 8 holding the discs seated within the sleeve. Upon completion of the grinding or polishing, the sample disc may be readily removed by inserting a rod through the hole 6 and pushing the disc away from the magnets. The working ends of both the cylindrical body and the sleeve are accurately finished. Suflicient stock is provided in these members to permit dressing necessitated by accidental contact with the grinding belt or polishing disc.

While one embodiment of my invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.

Iclaim:

A holder to facilitate manipulation of workpieces in the form of thin discs, comprising a cylindrical body member having a fiat work-holding face at one end adapted to receive a workpiece thereon, a plurality of permanent magnets extending into the body parallel to its axis and spaced radially therefrom, said magnets each having one end positioned flush with the workholding face of said body, a sleeve threaded onto said body member with one end thereof adjustably overlying the work-holding face of said body, and a lock nut threaded onto said body member adjacent the end of said sleeve remote from said overlying end.

FREDERICK E. RICHARDSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,166,974 DeLeeuw Jan. 4, 1916 2,179,625 Groden Nov. 14, 1939 2,367,839 Grover Jan. 23, 1945 2,539,532 Daniels Jan. 30, 1951