US1910143A - Auger bit - Google Patents

Description

May 23, 1933. 1 Al ARENZ 1,910,143

AUGER BIT Filed May 29, 1951 l @0627759 JOHN 7/.7 gaf/vz Patented May 23, 1933 UNiTEo STATES" PATENT OFFICE'; i

OOIIIANYQOF WILMINGTON, DELAWARE',- A CORPORATION on nELnwAitnl 4A1If=iIzItisIT i Application filed May 29,

rlhis inventionv relates'to auger bits and in particular to a bit having a .double threaded, single pointed, speed leading end. s

A particular object of my invention isto provide a double threaded, single pointed speed bit which is 'equally well shaped for use in either hard orsoft wood and so constructed that the auger willbe fed into the 'wood at a uniform degree of travel and at a rate of speed much higher ythan at which present auger bits in use are capable ofy enteringthe material tobe bored, in this way materially lessening the amount of time consumed in boring operations and lessening the cost thereof. j

Another important obj ect'of my invention is to provide an auger having a single pointed speed end which is combined withA a plurality of upper and lower cutting edges on the auger body so' thatchips are cut away cleanlyzand rapidly and without theuseof eXcess power in driving the bit into the wood or material to be bored. Y

Another and further object of my inven-` tion is the provision of an Vauger bit having a screw threaded member formedon the en. tering end thereof which willnot readily become damaged or broken during the `travel of the bit through the wood and which causes the bit not only to be properly centered and to travel in a straight line after being started in the wood but also advances the auger much more rapidly thanhas heretofore been possible. Y e,

The foregoingand other objects f my invention will be more' fully and better under` stood by reference to' the accompanyingl sheet of drawing, in which, l n

Figure l is a view in elevationA showing my improved form 'of twistedV augerfwitli which is integrally formed at its lower or advancing end, a single pointed, double threaded lead screw. 1 y

Figure 2 is a view in elevation of another type of auger bit employing a single pointed, double threaded lead screw. Y

Figure 3 is an enlarged view showing the double threaded, single pointed speed end of the bit as it would appear in its advance through material to be bored.

1931. serial 110,540,944. 'I

JOHN A. ARENZ, on MOUNT VERNON, vNiivv Yeni; AssIGNoit ITO DOUBLE THREAD BIT Figure 4 is-an enlarged end view'of the bit I l and lead screw illustratingythe single point of the-,double thread made use of in its con; struction. Y 1 y Figure 5 is a viewin sectional elevation showing the use of my improved speed bit in a hole boring action, l.the clearance provided for the chips being clearly- 'illustrateL i Figure 6 is a cross section taken through the bit on the line 6 6 inV Figure l showing the unique cross sectional shape of the shank which provides greaterl clearance for the chips during a boring operation. y Y Y Figure?? isa section on the line 7 7 of Figure 4.' Y

- Referring to the drawingindetail and-in particular to the construction illustratedfin Figure 1,15 illustrates an auger bit, the shank or body portion 11 of which is provided at its upper end -with a squared portion adapted to fit into'the chuck of a brace or other turning implement. Theauger bit is essentially formed from a flat strip of material twisted into apair of spiral edgesl?) and 14, the shapingof the bit being so carried out that the material-between the edges, as illustrated in Figure 6, is very thin as at -A,-the edges being flared at opposite sides'to provide the cutting edges 13 and 14. It will be noted that the shank-wall 15-A, being thin, provides plenty of room for .the passage of chips between the section l-A oftheauger bit and the kwall of the hole being bored with the result thatjamming of the bit is prevented and operation of therbitl is facilitated.` The distance AXFigure 6) is sub-A stantially thesame as the `radius R, thus making the depth of the auger channels =(dia` metrically opposite) substantially equ'aljto half the diameter of theV drill. The j'spiral edges 13 and 174 terminate at the lower end of therbit in a pair of horizontally extend@ ingQoppositely idisposed.cutting` blades` and 16 respectively, which, turn, have formed a't their .outer end, vertically extending- upper cutters 17 and 18 respectively and lower cutters 17-A and 18.-A below said cutters El5 andfl, which serve kto Vcut 'the l of the bodyv of the auger 25.

volving movementiof thek auger bit,'they will;

engage within the fibers of the wood which' close thereover and will work their way into..-y

the wood, thus making it only necessary for the operator to revolve the augerxandthe lead screw or barb will draw the bit through the materialto'be bored very rapidly and1 with precision. The threads 19-and 20 terminate at the 'lower end offthe speed screw in a single point 24 which not only permits the bore to be cut straight and clean but enters the wood upon the slightest turn of the auger bit. The single point formed by the termination of the threads A19 and 20, as indicated by the numeral 24 isjin alignment with the longitudinal axis of the auger sov that the point 24 enters the fibers -fof the wood and directs the auger bit ina straightline therethrough, the threads19 and 2O drawing the auger into the -wood and feeding itftherethroughwhile the cutters4 at the lower end of the bit remove the chips as the bit travels through the wood, it beingnoted vthatthe shape inv cross section'ofk the auger perniit'the chips as illustrated in Figure f5 to travel out ofthe bore Without `"causing the auger bit to become `iammed, thereby eliminating vany necessity for the freeing ofthe bit. Y Y Y l"With respect to? the illustration yof Figure 2, an auger bit is shown having a body portion 25 which terminates at Aits upper-end also in a squared portion 26 arranged to be engaged by the'soc'ketor. chuck or abrace or other turningelement, this auger bit being also4 provided with a pair of spiral blades 27 and 28, the blades terminating in a pair'of horizontally disposed cuttingedges -29 and 30 respectively, positioned at opposite sides The cutting edges'29 and 30 are provided with side, lupper cutters ,31 and 32 -`and lower cutters 31-A and 32-A respectively, the body member 25 ink thisV instance, yterminating in a` double threaded speed lead screw 33 which isidenticalto the speed lead screw illustrated and described in connection withthe auger of Fi urel. he extreme 'tip' end 'of jthe'speed lead screw 33 is provided with a singlepoint 37j marking the termination of both threads whereby a sharp wood engaging pointis provided foil starting the auger properly.

lead screw which is also double threaded,

` the threads being so arranged that they will bit,'the end ofthe angedj or en d `portion' of the bit, terminates inv an upperfvertically .disposed cutting edge 17 at one side of the cutting 'edge 15 which is generally referred to, as,the-hovrizontalrutting edge and below this horizontal cutting edge, the projection of the member 17 is alsol sharpened' as at 17-'A to provide a vertical cutting edge so thatv at opposite sidesof the lead 'screw 22 there is provided three cutting edges Yand it is evident that the termination of each ofthe channels provides substantially three cutting edges at each sideof the lead screw, making six cutting edges in all. Y Vhfle I have describedmore orrless precisely, the details of construction, I do. not wish to be understood as limiting. myself thereto: as I .contemplate changes in the form and the proportion of parts and the substitu-` tion of equivalents as circumstances may'. suggest or render it expedient without departing from the spirit or scope of my invention. x f c Having described my invention what I claimisz I .Y l

An auger bit having a cross sectional shape presenting channels of substantially the widthof half the diameter of the :bit at the center of the bit, the outer edges ofthe channelsy being iiaredto provide cutting edges, eachof said channels terminating in a horizontal cutting edge bevelled at one side thereof, the outer ends of saidA horizontal cutting edges being bounded by vertical cutters having cutting edges disposed above andbelow said horizontal cutting edge, a tapered portion terminating ina point, double threads extending to the extreme tip of the tapered portion to provide a lead screw, said threads gradually tapering out and merging in a common point' the .lower end of each ofthe cutting 4edges eing positioned in, the center line of the screw landthe meeting point of said cutting edges forming a downwardly directed point.- In testimony whereof, I have signed my name to -this specification, this 27th day of May 1931'.

' It Will be quite evident .from .the foregoingY that I 'have providedan auger lbit lwhich is double threaded, orrather, double spiral and which'is providedwith a single point7 speed` JOHN A, ARENZ. [Lisi

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