US1532040A - Reamer - Google Patents

Description

March 31.1925. 1,532,040

P. H. coNRADsoN BEAMER Filed April 19, 1924 Patented Mar. 31, 1925.'

UNITED STATES PATENT OFFICE.

IEIKIEIII'.I.I(.'1i H. CONRADSON, OF lCHICAGO, ILLINOIS, ASSIGNOR TO CONRADSON T001)v CORPORATION, 0]?I DETROIT, MICHIGAN.

annum.

Application led April 19, 1924. Serial No. 707,591.

To all rwhom t may concern:

Be it known that I, PRENTICE H. CONRAD soN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Reamers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming 0 a part of this specification.

My invention relates to reamers.

One of the objects of the invention lis to provide a practical andsatisfactory construction of reamer.

Inthe accompanying drawings Fig. 1 is a vertical section cian apparatus for making reamers embodying my invention, and also an elevation of a reamer in said apparatus;

Fig. 2 is a plan view of the same; and Fig. 3 is a side elevation' of the reamer itsel Referring to the drawings, I show a reamer comprising a shank 1 and a body portion 2, which latter is. provided with cutting blades 3 3. The latter vare arranged longitudinally in the body 2 in longitudinally extending grooves.v

The body 2 is composed of a metal which is hard and strong, but which ,melts at a comparatively low temperature, as for exv ample, an aluminum alloy, some of the well space or chamber adaptedto form the body' known ones of which melt around twelve hundred to thirteen hundred degrees F.

The blades 3 3 are of hard tempered steel, having of course 'a high melting point, whose temper is not affected by the melting point temperature of the aluminumdalloys referredto, namely twelve to thirteen h'undred degrees Fahrenheit; The reamer. is formed by casting the shank 1 'and body 2 with .the blades 3 3 in it, the aluminum alloy being run in in a melted condition, and the blades 3 3 cast init.

This may be advantageously done byl using a steel mold 4 having, for example, a base piece 5, and an annular member 6, and a top 7. The base 5 has an aperture for the shank l and the annular member'G has a 2, and also has grooves for the blades 3. The top 7 has slots adapted to receive and hold the upper ends of blades 3. The top .7 is made in two pieces` 7 and 7", so that it may be readily. laid in position and removed. A washer 15 is Iplaced upon top 7 so as to keep the two halves together. Pins 10 and 1,1 ar employed for holding members 5, 6 and 7 1n proper relative positions.

Thus the reamer may be for-med by setting blades 3 in position in the mold, and holding them inrsuch position, and then "Bassum than the point at which bladetemper will l be aii'ected.

.Thus the reamer will be more light and yet stron effective and durable and the process o making it will be very inexpensive, and the apparatus simple.

It will be understood that changes and modifications may be made without departing fromr the spirit of the invention.

What I claim is:

1. A metal cutting tool comprising a body the body for more than one half their n l9o 2. A metal cuttingtool comprising a body of d-ie cast aluminum alloy having a melt- -f ing temperature of approximately 1200 degrees to 1300 degrees Fahrenheit and blades of hard tempered steel, the drawing point of the temperbeing above 1400 degrees Fahenheit, said bod being vcast .on the base portions of4 the' lades, said blades being embedded in the bodyv for Amore than one E half their depth.

In witness whereof, I'hereunto subscribe my name this 3rd day of April, A. D., 1924;.

PRENTICE H. coNRADsoN.

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