US1169406A - Boring-bit. - Google Patents

Description

F. KONIECZKA.

BORING BIT.

APPLICATION FILED MAY 14. 1914.

Patented Jan. 25, 1916.

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FRANK KONIECZKA, OF CHICAGO, ILLINOIS.

BORING-BIT.

Specification of Letters Patent.

Application filed. ma 14, 1914. Serial No. 838,505.

To all whom it may concern Be it known that I, FRANK KONIECZKA, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Boring-Bits, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in wood boring tools.

Heretofore it has been found difficult and at times impossible to bore holes of any considerable size, especially when working in hard wood, with the ordinary form of portable hand tool. For example, plumbers, electricians, and the like who are frequently called upon to cut fairly large holes in hard oak floors experience much difliculty and annoyance in the operation. Sometimes the hole will be cut by boring a circle of small holes. Tools have been devised with a view to boring large holes, but it has been found that it is oftentimes impossible to obtain the proper amount of leverage without complicated rigging and there is great liability of breakage.

It is one of the. objects of my invention to provide a portable, manually operated bit capable of cutting holes of considerable size and one that will operate equally well in soft wood or hard.

Further objects of my invention are to provide such a bit that may be used with the ordinary form of hand brace; to provide a bit of the sort described that is adjustable for boring holes of different diameters; to provide such a bit that takes the strain in such a way as to avoid the danger of breakage; to'provide improved forms of cutters cooperating in attaining the desired ends; and to provide a bit of the character described that is economical to manufacture, easily carried about and readily operated.

Additional objects and advantages of mv invention will be apparent from the following description taken in connection with the appended claim.

I have described in the following specification and illustrated in the accompanying drawing, one embodiment of my invention, as an example, it being clearly understood that changes may be made in the form, construction and arrangement of the parts without departing from the spirit of the invention or exceeding the scope of the appended claim, the form of invention herein disclosed being merely one preferred embodiment thereof.

In the drawing: Figure 1 is a view in front elevation of a bit constructed in accordance with my invention; Fig. 2 is a crosssectional view taken on the line 2-2 of Fig. 1, looking in the direction of the arrows; Fig. 3 is a similar view taken on the line 33 of Fig. 1; Fig. 4 is a cross sectional View of a portion of the shank showing a modification; and Fig. 5 is a cross sectional view (enlarged) taken on the line 55 of Fig. 1.

Like reference characters refer to like parts throughout the following description and the several figures of the accompanying drawing.

Referring to the drawing, the bit has a shank 10 provided with the usual squared end 11 whereby'it may be stocked in the socket of an ordinary brace. The shank 10 has an internal bore which is screw-threaded to engage a screw-threaded stem 12, extending up intothe bore and serving as a feeding member, as hereinafter described. This stem 12 is provided, at its lower end, with atapered portion 13, having cutting threads 14 formed thereon, which are broken by a pair of spiral channels 15, and a boring point 16, the whole forming, in effect, a twist drill and also forming an anchorage means along which the boring mechanism, to be described later, may be fed.

. The lower end of the shank 10 is enlarged to form a mandrel which is provided with diametrically opposed recesses 17 for the reception of the lateral arms 18 of two side cutters which seat in the recesses 17, being embraced at their top edges by downwardly projecting flanges 19 on the mandrel, and resting at the'bottom 'onthe shoulders 20 of the recesses.

The cutters are secured to the mandrel by means of the following plates 21 which are fastened to the mandrel by machine screws 22 and have shoulders 23 bearing against the arms 18 ofthe cutters and resting on ledges 24: formed at the edges of the shoul- Patented J an. 25, 1916.

ders 20 of the recesses the screws 22 being adjustable to securely clamp the arms 18 in place.

Substantially at right angles to the arms 18 of the cutters are downwardly extending legs 25 which are curved slightly forwardand terminate in cutting edges 26 of the gouging type. At the rear thereof and eX tending below the same are thin cutting spurs- 27,,the spur of one-cutter being at the outer side of the cutter, that of the other being at the inner side of its cutter. Otherwise the cutters are identical. L I

On the shank 10 of the bit-is an aperture forthe passage of a catch 28, adapated when pressed inwardly to engage a slot 29 formed meanwhile boring into the" wood, the-chips and shavings being removed through the spiral channels 15. When the drill or bor ing member penetrates far enough to firmly grip the wood the catch 28 is released, thus unlocking the shank 10 from the stem 12. On continued operation of the brace the shank, carr'ying'the side cutter, will rotate about the screw-threaded stem which is held stationary by its position in the wood and will feed down on the same,-thus bringing the side cutters into engagement with the wood, the spurs27" first makingcontact as will be"obvious. As these spursare at different distances from the center, the incisions cut'thereby' will have the form of two concentric circles, the distance between being substantially the width of the forward cutting edges 26, which, as the bit further feeds, willchisel out this portion. This action continues until the material worked upon is-penetrated. It willbe apparent that thewoo'd is not cut to the full extent of the hole desired, but rather a disk is'v cut out and accordingly there is a? great economy-of labor. Owing'to th'e'firm grippingpurchase provided by the central boring'member and to-the form of the side cutters, thehole' can be bored quickly'and easily.

In case'th'e wood to be bored is of any considerable thickness, the above operation is carried out as-far as feasible. The bit is then' withdrawn leaving a circular wedge which can be knocked out, whereupon the operation is repeated as often as necessary until-the-entire piece is penetrated.

It willbe seen that holes of differe'nt diameters may be bored'by" altering the position's' of the side cutters; loosening the screws 22 the arms 18 of the cutters may be shifted laterally to increase or decrease the cutting" radius. The arms may be any length within the rangeof practicability, or a set of side cutters having arms of different' lengths may be used if desired.

In the modification shown in Figs. 4 and tithe internal bore of the shank 10 is smooth, and in apertures 30 in the shank are pivoted screw-threaded plates 31 adapted toengage the screw-threaded stem 12 when pressed inwardly. This latter is accomplished by a cam ring 32, rotata-bleon the shank 1-0 and having cam surfaces 33' adapted to engage outwardly projecting arms 34: of the-plates 31. It will be seen that when the-ring 32 is rotated to bring the cam surfaces 33 in contact with the arms'3 l. theplates 31 will be held in engagement with the screw-threaded stem 12. Thenwhen the bit is rotatedthe shank will feed down on'the stem as above described, the only difference being that the latter is in engagement merely withthe plates 31 instead of with the entire'inner surface of the shank. The advantage of this form isthat when it'is-desired to move the stem 12 relatively to the shank, as for example, to place the boring-and gripping member in the proper position for commencing operation, instead of having to unscrew itit is only necessary to turn the cam ring 32 to allow the plates 31 to move out ofe'ngagement with the stem 12, whereupon the latter may be freely moved upand down as'desired.

Owing to the form of the rotating cutters the strain thereon is greatly lessened. The thin cuttingspurs'make their incisions with little str'ain and they leave only aonarrow, thin' strip" to be chiseled out by the trans 105 verse cutters. Thus it will be apparent that thestrain on the cutters is much less-than it would be on'the o'rdinary'cutter.

Practically none of the" strain is on the sec'uring'plat'es2 1, as the force against the side cutters binds the arms against the shoulders19 and thus thestrain is taken by themandrel in such a'mane'r that the ha bilityofany of the parts breakingis to largeextent removed,

Thus, I have providectby my'invention, a portable, manually operated bit capable of easilyand'quickly boring holes of considerable size" in soft or. hardwood, and, at the same time, a bit adjustable to bore holes of various-diameters. Q 1

Having thus described my invention what 7 I claim as new and desire to secure by Let ters Patent is 3- In a' boring bit, a shank, a threaded'stem onwhich said shank feeds, an arm associated with said shank, a cuttercarried by said arm revolving about said' stem at a substantial distance therefrom, and a boxand anchoringmeinber associated with 139 said stem having a plurality of cutting edges at the end thereof for cutting and loosening material in advance of said member, said boring and anchoring member being provided with screw cutting threads for feeding it downwardly and preventing its withdrawal, and a plurality of channels leading from said cutting edges and extending across said threads affording passages for the material cut and loosened by said cutting 1 edges.

In wltness whereof, I have hereunto subscribed my name 1n the presence of two witnesses.

FRANK KONIECZKA. lVitnesses:

VINCENT KONIECZKA, VICTOR J. VYSZYNSKI.

Gopies cf this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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