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Publication numberUS1190707 A
Publication typeGrant
Publication dateJul 11, 1916
Filing dateApr 15, 1911
Priority dateApr 15, 1911
Publication numberUS 1190707 A, US 1190707A, US-A-1190707, US1190707 A, US1190707A
InventorsWilliam C Beindorf
Original AssigneeWilliam C Beindorf
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Combined tap and reamer.
US 1190707 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



Patented July 11, 1916.

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Application filed April 15, 1911.

T 0 all whom t may concern Be it known that l', lNiLLiAM C. BnrNnoRr, a citizen of the United States, and resident of Litchfield, Montgomery county, Illinois, have invented certain new and useful Improvements in Combined Taps and Beamers, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to improvements in combined taps and reamers, and the object of my invention is to construct an improved integral tool designed to tap or form internal threads in one portion of an opening and to ream out or enlarge, without cutting threads or tapping, the remainder of the opening.

lVith the above purpose in View my invention consists in certain novel features of construction and arrangement of parts as will be hereinafter more fully described, pointed out in the claim and illustrated by the accompanying drawings, in which- Figure 1 is an elevation of the complete tool; Fig. 2 is a transverse, sectional elevation of the reamer portion of the tool taken on the line 2 2 of Fig. l; and Fig. 8 is a transverse, sectional elevation of the tap portion of the tool taken on the line 3 3 of Fig. 1.

Referring by numerals to the accompanying drawings: 1 designates the body portion of the tool which is substantially cylindrical, and formed integral with thebodv vportion is a non-circular portion 2 which is arranged so that the tool may be secured in a brace or other means not shown for the operation of the tool. The lower end of the body portion 1 has a diameter slightlv larger than the remainder of the body as clearly shown in Fig. 1, and, at the point where the body portion 1 increases in diameter and extending from that point to the lowermost end of the tool are the longitudi-4 nal grooves 3. The portions 4; of the walls oitl said grooves are sharpened at the point of greatest diameter and at their lower ends to form thereat cutting edges and, as clearly shown in Fig. 2, the said sharpened parts extend beyond the periphery and lower end of the body portion 1. It will thus be seen that the said body has its inner end gradually increased in diameter toward its inner end, at which point project radially Specication of Letters Patent.

Patented July 11, 1916.

serial No. 621,183.

beyond the body proper a series of laterallyprojecting reamer-cutters.

The points 5 of the reamer portion extend only to the periphery of the body l so that, when the tool is in operation to ream or enlarge an opening, the portions 4 are the active portions in cutting, the balance of the reaming portion of the tool receding so as to save stock and make the tool as light as possible consistent with ample strength, and also to provide clearance and hence serve to makethe tool, in a measure, self-sharpening as well as to make a tool requiring less :c lfort t'o operate than one in which the cut- -ting surface contacts with the full interior face of the opening being enlarged.

The tapping portion of the tool, or that portion designed for the cutting of threads, consists of the longitudinal ribs 6 lying between the grooves 3, the faces of which are provided with the usual threads 7. The tap portion is of ordinary construction except that the points 8 of the threaded ribs have slightly increased diametrical dimensions over the points 9 of the said ribs, the points 8 being the forward points and the faces of the ribs receding for clearance so that the tool will Operate more easily. This tool is designed primarily for use in the repair of machinery, for instance in steam tractionengine boiler work when a bracket or the like, which is secured to the boiler' by bolts or cap-screws, becomes loosened and is not steam-tight the bolt, which connects the bracket with the shell of the boiler, is removed and one of my improved tools of the proper size is introduced, the tap portion cutting new threads into the shell of the boiler forming a tapped hole slightly larger than the previous hole and the reamer portion cutting a hole in the bracket or the like slightly larger.

After the larger alined holes have been made, as just described, a larger screw or bolt is passed through the hole in said bracket and into the threaded hole in said boiler, and the leak in the boiler will be effectually stopped. Furthermore, the constant vibration of an engine in motion, which tends to loosen smaller screws or bolts, will not so quickly loosen the larger bolts or screws which have been placed in po sition by the use of my improved tool, in the manner above described. To illustrate further, suppose a bracket on the boiler of a traction-engine has been secured to the boiler by means of J2 inch bolts, which have become so loose that the steam leaks around them. To repair such leaks, the l; inch leaking Vbolts are removed: then the alined holes in the bracket and boiler are enlarged by means of my improved tool, and fg bolts are inserted; all of which may7 be accomplished very quickly and efficiently.

VI am aware that heretofore there have been tools the eXact reverse of my improved tool which tools had reamers at the lowermost end of the tool for enlarging a hole and then a tapping portion to tap or form threads inthe entire hole. `With my improved tool a portion of the hole may be tapped or threaded and the portion outside of the threaded portion be enlarged without cutting threads therein.

I claim:

An improved tapping and reaming tool, all formed integral, and comprising a cylin- Gopies o f this patent may be obtained for drieal body proper, the inner part of which is provided with longitudinal-grooves, and is gradually increased in diameter toward its inner end, the Walls of said grooves being sharpened at the point of greatest diameter and at their lower ends, to form thereat a series of laterally and downwardly projecting integral reaming-cutters which extend radially and longitudinally beyond the said body proper; and a tap-screw formed integral with said enlarged inner end of said body, but having a lesser diameter throughout its length than the extreme diameter' oi the said diametrically-enlarged portion of the said body.

In testimony whereof, I have signed my name to this specilication, in presence of two subscribing witnesses.


lVitnesses t H. Hoon, BLANCHE WILSON.

ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3195155 *Nov 26, 1962Jul 20, 1965Bendix CorpProcess of threading an opening
US7114891 *May 22, 2002Oct 3, 2006Sandvik Intellectual Property AbThread forming tool with annular ridge
U.S. Classification408/216, 408/224, 408/220
Cooperative ClassificationB23B5/168, B23G1/22