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Publication numberUS238002 A
Publication typeGrant
Publication dateFeb 22, 1881
Filing dateMay 15, 1880
Publication numberUS 238002 A, US 238002A, US-A-238002, US238002 A, US238002A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 238002 A
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Description  (OCR text may contain errors)

' H. W. RANSOM. Bit for Boring Hubs.

Patented Feb, 22,1881.




SPECIFICATION forming part of Letters Patent No. 238,002, dated February 22, 1881. Application filed May 15, 1880. (No model.)

To all whom it may concern:

Be it known that I, HIRAM TRANSOM, of the city of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Bitsfor Boring Hubs, of which the following is a specification.

The object of my invention is to bore the hubs of wheels for vehicles preparatory to inserting the boxes therein, and to make this bore of different diameters in difierent portions of the hub, as and for the purposes hereinafter described.

Referring to the drawings making a part of this specification, Figure 1 represents the hit of my invention. Fig. 2 represents a central section through a vehicle hub and box, showing the shape of the bore as produced by my invention, and illustrating the advantages obtained thereby. Fig. 3 represents the preferred form of bit which I use for boring or reaming the outer end of the hub for reception of the nut which retains the wheels on the axle.

The bit shown in Fig.1 is provided with cutting-edges at A, B, and O, and so constructed as that each cutter shall bore a different-sized opening-for instance, A boring the size shown in Fig. 2 from 1 to 2, B the size from 2 to 3, and U the size from 3 to the end of the hub.

To prevent undue friction and consequent heating of the bit, I construct it, as shown, with the contracted portions to and 1), thereby preventing the bit from coming into contact with the hub being bored, except for a short distance from each cutting-edge. This keeping of the bit out of contact with the hub prevents the greater portion of the friction arising from the contact of the wood during rotation of the hub around the bit or of the bit Within the hub, as the greater the amount of friction generated the greater is the amount of heat imparted to the bit, and the heating of the bit causes it to stick, and consequently requires more power to propel it through the wood.

The advantages in this particular of my improved construction of the bit are obvious.

The front end of the bit is provided with the usualpoint D forinsertion into that small central hole through the hub which iscommonly made when this hub is manufactured. This point I) being of about the same diameter as that of the hole, acts as a guide to the bit during its progress through the hub.

It will be observed by reference to Fig. 2 that in a hub bored with my improved form of bit the portion of the hub from 2 to 3does not come in contact with the box, the object of which is to prevent the ends of the spokes from coming in contact with the box.

H represents one of the spokes in section, and H the mortise in the hub for another spoke. Should the ends of these spokes come in contact with the box, the least shrinking of the hub would cause the spokes to work loose and the wheel thus become weakened. I therefore construct the cutting portion B on a part of the bit that will cause it (said cutting portion) to bore past the center of the hub, or that portion of the hub into which the spokes are inserted. The hub is thus made to fit tightly around the box for some distance at either end and be free from the box in the middle.

Fig. 3 represents the form of bit which I preferably employ for boring or sinking the end of the hub, as shown in Fig. 2, for reception of the nut E. This bit is flattened at the end, as shown, and provided with the cutting-edges d c and d e on either side of the center. This bit is prevented from boring farther than desired by the shoulders f f, which come against the end of the hub when the bit has bored far enough.

What I claim as new and of my invention, and desire to secure by Letters Patent, is-- A bit for boring hubs having the cutting portions A and 0 located near either end of the bit and the cutting portion B located at some point between the portions A and 0, said cutting portions being separated by the constricted portions to andb, substantially as and for the purposes specified.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2681673 *Oct 11, 1952Jun 22, 1954Mackey Bruce ADrill bit
US2692627 *Oct 19, 1953Oct 26, 1954Edw L Sibley Mfg Co IncBoring tool
US2752965 *Apr 20, 1953Jul 3, 1956Mackey Bruce ADrill bit construction
US6652203Aug 30, 2002Nov 25, 2003Credo Technology CorporationPrecision drill bits
Cooperative ClassificationB23B51/108