US955803A - Auger. - Google Patents

Description

A. H. HOWLAND.

. AUGER.

APPLICATION FILED APR. s, 1909.

955,303, Patented Apr.19,19 10.

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HQlVLAND, 9F NE'W YGBIK, N. X.

AUGEB.

To all whom it mag/concern:

-a citizen of the United States, and a resident of the .city of Worcester, county of 'VVorcester, and State of Massachusetts, have invented a new and useful Bit or Auger, of

' whichthe following is a specification, referonce being had to the accompanying ings, in which-- ,Figure 1 illustrates a sectional view through a portion of the felly of a wheel, with the tenon on the end of a spoke confined in a hole bored in the felly with a bit ,or anger made under this invention. Fig fi, illustrates a View, partly in elevation, and partly in vertical section, of a tool embodying the invention, showing the position of the parts at the commencement of the boring operation; Fig. 3 illustrates a view similar to Fig. 2, showing the position of the parts at vthe completion of the boring operation; Fig. lillustrates a plan iew of the frame which ,actuatcs the controller lever. Fig.

draw- 5 illustrates adetail of certain of the parts.

- The invention contemplates new and useful improvements inibits or angers whereby the cutting edge'of the tool will gradually lowing.

expand as it is led or forced into the material in which it 'isdesir'edltojborethe hole, with the result that the walls of thehole' will themselves diverge, in other words, he tapered. The invention is such, moreover, thatwith the same tool, a straight or an expanding hole may be bored, and the holes may have a fixed rate of expansion, as may be useful when the tool is to be used for one particular kind of work throughout its life; or they may have different rates of expansion, depending upon the shape and location of the parts which determine these features, as will be readily understood from the folholes to be bored may also be varied. The variations ment oned are desirable since they adapt the tool to miscellaneous aswellas regular work.

I accomplish the aboye-mentioned results by constructing the bit or auger, with its cutting and controlling parts made substantially as shown in the accompanying drawings. Other equivalent constructions may be employed for bits or augers intended for special work, but that shown in the drawings will illustrate the principles applicable.

to all.

Also the initial diameters of the.

Specification of Letters Yatent. ,Bafiqqgntgd 191, ifififi,

Application filed April 8,

1909. Serial No. 488,555.

j Referring to the drawings, in Fig. 1, 1, 1, represent the two halves of'the tenon of a spoke 2 entered into an expanded hole 'bored' in the folly 3 of a large wheel and spread therein by the introduction of a wedge 4: in a split or saw'kerfmade in the end of the "spoke.

Referring now to the other figures, '5 represents the shank of an ordinary expan-- sion'bit; Githe knife or cutterfll' the clamp 'plate,8 theclamp screw, 9' the;leading gim let point. All these parts are,v or may be as usual.

10 is a lug made on the side ofthe shank which is slotted in its vertical axis. V

11 area series of undercut notches made in, the upper edge of the knife in. which a cross pin 12 engages which. spansthe bifurcated lower end of a lever 13, ,which is fuleimmed at 14 in the'lug' 10. The lever 13 which 51 call the controller isslotted at 15 where the fulcrum pin. goes through it, so that asthe lower end or the lever .lllOVflS outwardly; the entire lever may slide downward, thus avoiding any jamming in the parts which would'otherwise occur if the radial movement was considerable, which is apt tojbe the,case in bits adapted to the-range of size variation vcommon in expansion bits.

"The above described parts are all that constitute the bit or auger proper, but in order that the cutter 6 may be made to move radially as the bit or auger is drawn or forced into the material in which the hole is beingbored, various mechanical devices maybe employed, one form of which is shown in the drawings. It is composedof the following elements. 16 represents a ring that rests on the surface of the material in which the hole is to be bored, 7 a smaller ring which encircles the shank 5 and 18 one or more connections between the two. When the bit or anger is placed against the material and all the parts are, for example, in the position shown in Fig. 2, then-the shank being revolved, the cutter or knife will cut away the material and allof the bit proper will be gradually drawn-into the hole thus being bored; but while this is'being done, the encircling-rings '16.;and 17 with theirconnections lSfcannot. enter the hole, on the .contrary, these partsrest against the sur- -"face of the material while the bit or auger is gradually drawn orforced down through them, and as this takes place, theupper end ofthe lever 13 is gradually forced toward the shank by the encircling upper ring 17 and the lower armof this lever is corres ondin'gly. forced radially outward, and t us the cutter 6 is ,made to move radially and cut a circle having a constantlyincreasing diameter and thus the expanded hole is bored. I prefer to make the notches in the upper ed 0 of the knife undercut, as shown,

so that t ere will be more reliable engage,

. ment between the cross pin 12 of the lever and these notches.

. knife as will give the hole the desired diameter.

' In order that thetool may be used as an ordinary expansion bit, 'I prefer to make the upper ring 17 of such size that when the knlfe and the lever are removed from the shank, the encirclingstandard will drop off from the end thereof, thus leaving the tool the construction illustrated and described.

P in the condition of an ordinary expansion 30 *n will be obvious to those who so romiliar with such matters that the details of may be departed from and still the essentials of the invention be retained. I therefore do not limit myself to such details.

I claim: p

1. In a tool of the class stated, a shank, a cutter carried by the shank and radially Other equivalent coni ns may be employed for all these.

senses J movable relative to it, a controller lever proit and a device carried by the shank and which engages the upper member of the controller lever and past which the latter moves when the tool is operated.

2. In a tool of the class stated, a shank, a cutter carried by the shank and radially movable relative to it, a series of notches upon the upper edge of the cutter, a controller lever pivotally supported upon the shank and provided at its lower end with means whereby it may engage with the notches on the edge of the cutter and a de vice supported by the shank and which engages with the upper end of the lever and past which the latter moves when the tool is operated.

3. In a tool of the class stated,a shank,

cutter carried by the shank and ra 'ally movable relative to it, a contra; :er iever provided with a slot and pivotall supported through the slot upon the shank, means upon the cutter and upon the lower end of the lever, whereby the two may be adjustably engaged with each other and a device .carried by the shank and which engages with the controller lever and past which the latter moves when the tool 15 operated.

In testimony whereof I have signed my name to this specification in the presence of 7 two subscribing witnesses.

y ARTHUR H. HQWLAND. Witnesses:

GEORGE A. GA'sKxLL, FRANCES H. BENNETT.

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