USRE4668E - Improvement in expansive bits - Google Patents
Improvement in expansive bits Download PDFInfo
- Publication number
- USRE4668E USRE4668E US RE4668 E USRE4668 E US RE4668E
- Authority
- US
- United States
- Prior art keywords
- cutter
- shank
- bit
- stock
- chips
- Prior art date
Links
- 210000001699 lower leg Anatomy 0.000 description 34
- 239000002023 wood Substances 0.000 description 12
- 210000000088 Lip Anatomy 0.000 description 8
- 238000010276 construction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000036633 rest Effects 0.000 description 4
- 241000575946 Ione Species 0.000 description 2
- 241000306729 Ligur Species 0.000 description 2
- GFNANZIMVAIWHM-OBYCQNJPSA-N Triamcinolone Chemical compound O=C1C=C[C@]2(C)[C@@]3(F)[C@@H](O)C[C@](C)([C@@]([C@H](O)C4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 GFNANZIMVAIWHM-OBYCQNJPSA-N 0.000 description 2
- 230000002730 additional Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000000266 injurious Effects 0.000 description 2
- 230000000284 resting Effects 0.000 description 2
- 230000000717 retained Effects 0.000 description 2
Images
Definitions
- Figure 1 is a side view ot' an expansive bit embodying a portion ot' my improvements, Fig. '2, an opposite side view; Fig. 3, an elevation, its plane of projection being' transverse ot' Figs. 1 and 2,1Fig. et, a sectional elevation, its plane ot' projection being' parallel to that in Figz, but transverse to that in Figs. 1 and 2; Fig. 5, a side elevation of the movable cutter; Fig. 6, a reverse view of it; Fig. 7, an end elevation; Fig. 8, an
- Fig. 9 a back-side elevation ot' a cutter so made as to keep always the movable cutter at just the same distance behind the point of the hit, while at the same time the depth of wood left to support the central portion ot' the bit is varied by the adjustment of said cutter
- Fig. 10 a side elevation ot' a bit which, while embodying the saine novel features as represented in the previous ligures, is also so formed as to throw the chips in front of the movable cutter, which arrangement avoids the necessity of tiling away the back side of the bit to allow the chips to pass;
- Fig. 1l an elevation transverse to Fig. l0; Fig.
- This invention relates to an improvement in what are known as expansive bits-that is, bits constructed with an adj ustinent-whereby the cutter can be extended or contracted so as to cut a larger or smaller hole, as the case may be; and the invention may be stated, in general, to consist of an expansive bit composed ot' a recessed shank, into which the adjustable or expanding cutterV is fitted, and in which it is adjusted and held, substantially as hereinafter described.
- A is the shank of the bit, upon which the inner or stationary cutteris formed, and in which the recess or inortise is made which receives the movable cutter B.
- the construction of the main portion of the shank, and of the cutting-tip permanently attached to it, is very much the same as other expansive bits7 but the mode of securing the movable cutter in its place is different.
- the form of the ledge a and that of the groove b is also shown in Figs. 3, 4, 11, and 13.
- the form of the groove is also shown in Fig. 7.
- the form of the groove l) and the ledge upon which it rests is such as to give a iirni bearing to the cutter B and draw it snugly against the back of the .recess when pressure is applied, which secures the said cutter in place.
- the cutter when thus dovctailed into the shank at its lower end, is secured in place with great ease, and without danger of injuring its cuttingedge, which is entirely relieved from any injurious pressure and contact with the shank by reason'of the dovetailed connection between the shank and the lower end ofthe cutter, thisconnection also serving to bind that end ofthe cutter most lirinly and tightly to the shank.
- a beveled plate or follower, D driven home by a screw, E, in such manner as to press the cutter B against the back side and bottom of the recess in which it is secured,the said cutter being also beveled, as shown, to facilitate the accomplishment ot this purpose.
- the form and arrangements of these parts are shown in Figs. 1, 3, 4, 10, 11, and 13.
- the relative positions ot ⁇ the cut-ters are such as to deliver the chips from the stationary cutter C upon the back side of that part of the stock which supports the movable cutter, and this involves the necessity of cutting away the stock, as shown at e in Figs. 2 and 3, to allow the chips to pass.
- the mode which I have above described of supporting and securing the cutter B supports it without its resting on the cutting-edge, as shown; and by thus supporting it the edge of a large cutter may be set higher in the stock than it is necessary or best to set the edge of a small one, which allows more wood to be left near the stock to support it, where alarge cutter is used.
- the cutting-edge of the cutter B is inclined so as to bring its working end lower than the other, for the twofold purpose of causing the unemployed end to clear the wood, and Vof leaving a portion of the wood around the cent-ral portion of the bit to support it, while at thc same time the outer end ofthe cutter B shall cut nearly or quite as far in advance asthe inner cutter.
- the vseat upon which the movable cutter rests at the bottom has, in most expansive bits, an inclination corresponding 'with that of the edge of the said cutter, and this feature is retained in my bit, as represented in all the f1 gures except Fig. 9.
- the sliding of the movable cutter outward also carries its working end downward, so that when placed in its extreme outward position it will cnt considerably deeper than when withdrawn, so as to cut its minimum hole.
- the cutter or (stationary) lip C is formed ⁇ in position upon the shank in which it is represented lin the drawing; or, in other words, in such a position that it will deliver its chips upon the side of the shank which is cut away to receive the cutter B, and upon which the cutter B delivers its chips, thus delivering all the chips on Ione side and allowing the other side to be left entire to give the necessary strength.
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