US2479136A

US2479136A - Reamer

Info

Publication number: US2479136A
Application number: US599439A
Authority: US
Inventors: Leo P Schade
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-06-14
Filing date: 1945-06-14
Publication date: 1949-08-16
Anticipated expiration: 1966-08-16

Description

Aug. 16, 1949. R SCHADE 2,479,136

REAMER Filed June 14, 1945 lieb P Sch/ade y A44-.By A

' "Mmeys Patented Aug. 16, 1949 Leo P. Schade, Washington, D. C.

1945, Serial N0. 599,439

(Cl. 7'1'72)A Application June 14,

1 Claim.

reamer, and so as to obviate interference with nishing by metal fused on the reamer in the roughing operation. Y

' Other and subordinate objects, also comprehended by my invention, together with the precise nature of my improvements Iand the manifold advantages thereof, will be readily understood when the succeeding description and claim are read with reference to the drawing accompanying and Y forming part of this specification.

In said drawings:

Figure 1 is a view in side elevation of a reamer embodying my improvements,

Figure 2 is a view in front end elevation, and

Figure 3 is a diagrammatic view illustrating the angle of incidence of the leading end cutting sections.

Reference being had to the drawing by numerals, my improvements have been shown therein as embodied in a stub machine type reamer having the usual shank I for insertion in a chuck, or the like, not shown, and a head 2 of the iluted type comprising longitudinal teeth 3 oblique to the axis of the head 2. For reasons presently apparent, it is essential to the practice of my invention that the head 2 be provided with aneven number of teeth 3, above two, six being shown as preferable.

According to my invention, the teeth 3 are provided with leading end cutting sections the lands of which flare rearwardly, relatively, and are ground longitudinally at diierent angles, as regards the lands of thev remaining portions of the teeth 3, in alternate teeth relative to intermediate same sides of all the teeth. Because of the def 2 lscribed-angles of the lands of the leading end cutting sections 4, 5, the cutting edges 3' extend crosswise of each other in a plane, indicated by the dotted line 6, in Figure 3, which is transverse to said sections, or, in other Words, the head 2. In the rear of this plane 6, said sections 5 lie outsidefof the orbit of operation of said sections 4, whereas, in front of the plane 6, said sections 5 lie within the orbit` of operation of said sections 4. Y

Thus, as will be seen, in operating with the described reamer, the leading end cutting sections 4 will ream rst to rough out a bore, and the leading end cutting sections 5 will follow with a nishing reaming operation, enlarging and iin'Y By accomplishing the roughing Y ishing the bore. operations, in the manner described, wear on the leading end cutting sections 5, that is, the cutting edges 3 thereof, is reduced to a minimum, the roughing operation being performed completely in advance of finishing. Also, metal fused onto the leading end cutting sections 4, which is to say the cutting edges 3' thereof, cannot be carried to the nished bore which is cut by the leading end cutting sections 5 as a new bore after 'roughing is completed. As will be clear, the

relative difference in the angles of incidence of the leading end. cutting sections 4, 5 may be varied to suit different operating requirements, for instance, in Working in diiferent kinds of metals.

As will also be seen, by varying the angles of incidence of the leading end cutting sections 4. 5, the length of said edges, as represented by the lines R., F, may be varied to correspondingly vary the length of the cutting edges 3 of the leading end cutting sections 4 in front of the plane 6, and the length of the cutting edges 3 of the leading end cutting sections 5 in the rear of said plane, so as to predetermine the amount of metal to be cut in the roughing and nishing operations, respectively.

The foregoing will, it is believed, sufce to'impart a clear understanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible ofmodications without departing from the inventive concept, and right isherein reserved rto such modifications as fall within the Scope of' the appended claim.

What I claim is:

A reamer tool comprising a cylindrical body having longitudinal alternate and intermediate cutting teeth spaced circumferentially around the same equidistantly and embodying leading end cutting sections inclined rearwardly from the within the orbit of operation of the end cutting sections of alternate teeth.

LEO P. SCHADE.v

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

UNITED STATES PATENTS Number Name Date 1,630,602 Blanco May 31, 1927 2,063,753 Pamman Dec. 8, 1936