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Publication numberUS1225209 A
Publication typeGrant
Publication dateMay 8, 1917
Filing dateJan 20, 1916
Priority dateJan 20, 1916
Publication numberUS 1225209 A, US 1225209A, US-A-1225209, US1225209 A, US1225209A
InventorsAlfred F Beaulieu
Original AssigneeAlfred F Beaulieu
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Drill extension.
US 1225209 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




1,225,209D Patented May 8, 1917.



Specification of Letters Patent.

Patented May 8?, 1917.

Application filed January 20, 1916. Serial No. 73,228.

To all whom it may concern;

Be it known that I, ALFRED F. BEAULIEU, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drill Extensions, of which the following is a specification.

This invention relates to attachment for drilling machines.

When a heavy casting or other piece of material is of too great a weight to be conveniently supported upon the table of a drill press or like machine much trouble has been found heretofore in placing the same in a position to conveniently operate upon it. It is the principal object of the invention therefore to provide a drill holding extension which may be attached to the machine so as to arrange the drill for operation near the base thereof. In this manner the casting may be placed upon the floor and the drill thus brought into engagement therewith to drill the same in any desired manner.

Another object of the invention is to provide an extension of the character stated which may be longitudinally adjusted so as to position the drill in any desired vertical position for convenient operation upon the casting or other material.

The invention further aims to provide an extension of the character stated which will be extremely simple in construction, cheap and easy to manufacture and which will be thoroughly reliable and eliicient in operation. lVith the foregoing and other objects in view the invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings and claimed.

In the drawings;

Figure 1 is a vertical sectional View through the improved extension showing a drill applied thereto;

Fig. 2 is a transverse section on the line 22 of Fig. 1;

Fig. 3 is a transverse section on the line 38 of Fig. 1;

Fig. 4 is a View illustrating a clamping plate constructed to be positioned at the base of the drilling machine to hold the casting or other article to be drilled.

Referring to the drawings by numerals 7 wherein is illustrated the preferred embodiment of my invention, 1 designates a tool holder which may be part of a drilling machine or may be adaptedfor attachment thereto as desired. This tool holder is provided with a longitudinally extending tapered opening 2 which may be of polygonal shape or round in cross section as desired. This opening 2 extends'into the holder 1 any desired distance and at its inner end communicates with a transversely extending opening 3 which extends throughout the thickness of the holder. The upper tapered end 4L of a rod 5 is adapted to be inserted in the opening 2 and is held against accidental removal therefrom by means of a set screw 6 inserted in one side of the holder and having its inner end adapted for clamping engagement with the tapered portion of the rod. The tapered portion of the rod is provided at its outer end with a projection 7 for a purpose which will presently appear.

A sleeve 8 is longitudinally slidable upon the rod 5 but is held against turning movement relative thereto by means of a tongue 9 on the rod engaging with a recess or groove 10 in the sleeve 8 as is clearly illustrated in Fig. 3 of the drawings. The sleeve 8 may be locked in any desired longitudinal adjusted position upon the rod 5 by means of a set screw 11 which is inserted into the sleeve and is adapted to engage the rod. The object of this set screw primarily is to prevent accidental falling of the sleeve from engagement with the rod.

The lower end of the sleeve 8 is formed solid as indicated at 12 and this solid portion has extending thereinto from the lower face thereof a tapered opening 13 which may be either polygonal or round in cross section to receive the shank 14E of a drill 15, the said shank being locked against accidental removal from the solid portion by means of a set screw 16 which is threaded in an opening in one side of the solid portion and has its inner end engaged with the shank of the drill. The tapered opening 13 extends into the solid portion of the sleeve any desired distance and has communicating therewith at its inner end a transversely extending opening 17.

It will be seen from the foregoin that the sleeve 8 may be longitudinally ad usted upon the rod 5 by loosening of the set screw 11, that the attachment as an entirety may be removed from the tool holder by merely loosening the set screw 6 or that a new drill of a diflferent size may be readily replaced in lieu of the drill 15 shown by merely loosening the set screw 16, the slots 3 and 17 in the tool holder and lower ends of the sleeve respectively providing for the insertion of a drift pin to forcibly remove the rod or drill should the same become wedged in the tapered opening.

A collar 18 is slidably arranged upon the rod 5 and is provided with a pair of ears 19 having alined openings formed therein and through which is passed a bolt 20 for locking the collar in any adjusted position longitudinally upon the rod. After the sleeve has been longitudinally adjusted upon the rod to a desired position, the collar is engaged against the upper face thereof and clamped upon the rod to form a bearing to prevent relative longitudinal movement of the sleeve and rod as pressure is applied to the tool holder to force the drill into cutting engagement with the material indicated at A.

Although the material to be operated upon may be held against movement in a variety of ways I provide a special base plate which is adapted to be secured upon the floor directly beneath the tool holder of the machine to which the material to be operated upon may be secured. This plate is of ordinary construction and is provided with a plurality of inverted T-shaped slots within which are arranged the heads of bolt elements which are adapted to be utilized in clamping the material in firm engagement with the plate.

From the foregoing description taken in connection with the accompanying drawings it is thought that the construction, operation and advantages of my device will be clearly understood and while I have herein shown and described one specific embodiment of my invention I do not wish to be limited thereto except for such limitations as the claim may impart;

I claim:

A drill holder comprising a cylinder having its lower end closed and further provided with a longitudinal groove, a tool holding block formed upon the lower end of the cylinder, a longitudinally adjustable rod fitting snugly within the cylinder and carrying means for connection to a tool, a longitudi'nal rib formed on the rod and fitting within the longitudinal groove in the cylinder, and an adjustable collar carried by the rod adapted to engage the upper edge of the cylinder.

In testimony whereof I affix my signature in presence of two witnesses.




Uopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patenta, Washington, D. C.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2848240 *Nov 9, 1953Aug 19, 1958William H GreeneBrace extension
US4017202 *Oct 20, 1975Apr 12, 1977Townsend Robert EBoring tool with variable extension
US4076444 *Mar 29, 1974Feb 28, 1978Siebrecht Gary LDrill bit extension
US5624214 *Dec 15, 1995Apr 29, 1997Carroll; StuartAdjustable drill bit extension
US6558089 *Sep 14, 2001May 6, 2003Deblasio Michael J.Extender assembly for core drill
US20140086698 *Sep 25, 2012Mar 27, 2014Thomas E. SissonDrilling Tool
U.S. Classification408/239.00R, 279/105.1, 76/108.6, 279/43.5
Cooperative ClassificationB25B21/007, B23B31/1071