Патент USA US2406442код для вставки
Aug. 27, 1946. L. A. sMrrH FLY GUTTER 2,406,442 ' Filed Aug. 11., 1945 ‘F2 /2 .46 l A.. Jb É. . @aw. my „W Patented Aug. 27, 1946 i . l 2,406,442 UNITED li STATES. PATENT oFFlcE FLY CUTTER Lawson A. Smith, Los Angeles, Calif., as_signor to Robert H. Clark, Los Angeles, Calif. . Application August 11, 1943, Serial No. 498,214 ' A'7 Claims. , (Cl. 77-69) 1' This invention relates to a cutter Vand has par- ' ticular reference to that type of cutter generally known as a fly cutter. A generalobject of _the invention is to provide a, simpleysturdy and high ly efficient toolof this character. ' ‘ Adjustable cutters of the type known `as fly cutters are commonly used for various cutting op erations, particularly for cutting round holes in sheet materials of different kinds, and they 'op 2 form of my present invention. Fig. 2 is another yside View of the device taken in thel direction of lines 2-2 on Fig. 1 with a portion broken' away to y show in section, and Fig. 3 is an end elevation Vof the cutter, being a view taken as indicated by line 3-3 on Fig. 1. . The device provided by this invention includes, generally, a body I0, a shank Il for mounting the erate to cut an annularjgroove or channel and 10 body in a suitable machine orioperating device, a pair of arms.v I2 carried'by the body to project lat thereby remove a round disc or slug. Ordinary erally therefrom adjacent its lower end portion devices of this character are not altogether satis factory, due primarily to the fact that they are not sufliciently ñrm or rigid and are such that there is a marked tendency for them` to chatter 15 for securing the arms in the desired position rela tive to the body, cutters I4 carried by the outer while in use, and frequently they tend to dig end portions of the arms to depend therefrom, re into the work, resulting in the breakage of cut taining means I5 for the cutters operable to ñrm ly set 0r grip them in the desired adjusted posi It is an object of the present invention to pro tions, and a pilot I6 depending centrally ' from , vide a construction for a cutter of the character y referred to that is extremely simple and compact, 20 the lower end of the body IIJ. The body of the tool provided by my invention making it inexpensive of manufacture and high ly practical to use. . is preferably in the form of a unitary block of steel, or the like, having considerable mass and Another object of the invention is to provide proportioned so that it .is inherently rigid and a simple, sturdy construction that _operates to solid. In the preferred form of the invention ñrmly support the cutting parts and thus elimi the body is polygonal in cross section, for in nates uneven operation or chatter such as com stance it may be hexagonal as shown in the draw monly occurs in devices of this character. y ing. The body is made` sufficiently long to Vac Another object of my present invention is to - provide a cutter of the character referred to in 30 commodate the various parts hereinafter de scribed and its lower end 2U is preferably finished which the cutter-carrying arms are` _supported so that it is flat and lies in a plane normal to the close to the lower end of the body so`that the longitudinal axis of the body and of the tool. space between the body and the work is mini The shank H projects upwardly from the body ters. mized. „ _ ‘ . ‘ ' ' A further object of this invention is to provide a cutter of the character mentioned in which the cutting tools are supported so that their cut ting parts or edges are related Vto the points at which the cutters are supported by the arms in concentrically therewith, and is preferably ` formed integral with the body as shown in the drawing. The shank is provided as a means for applying the tool to a machine or operating de vice and to this end may be designed and propor a manner so that the cutters tend to lift away 40 tioned to ñt such driving means. For ordinary purposes kit is desirable to provide a tapered shank from the work or be relieved rather than to dig as is shown in the drawing. _ 1 into the work in a manner to cause injury to the parts. ‘ ‘ The arms l2 are slidably carried in channels 2 l` formed parallel to each other in diametrically Another object of my invention is to provide an opposite sides of the body I0 adjacent the lower improved pilot construction for tools operating to make an annular cut. I provide a pilot that ' end of the body. The arms `are preferably in the effectively holds the work and also guides the form of elongate member _ or bars preferably The various objects and features of my inven square in cross section, and are adapted to be arranged in various adjusted positions in the channels in order to vary the positions of the cutter. tion will be fully understoodfrom the following detailed description of a typical preferred fOrm and application of my invention, throughout which description reference is made to the accom panying drawing, in which: 50 cutters which are carried by their outer ends. The channels 2l which slidably carry the arms I2 are located opposite each other in diametrical 1y opposite sides of the body and are located close Fig. 1 is a side elevation of a typical preferred 55' to the lower end 20 of the body so that there` is but ashort distance between the lower sides of tion of each arm provided'with cuts 40 and ÃI; - ' theV arms and the bottom ofy the body. VThrough the cut 4l extending inwardly from the channel " 35 so that the part d2 'defining one wall. of the channel, can be sprung to grip the cutter. A " clamp screw K13-is threaded to the part dâ of the ,this construction the arms are supported by the Vzbody in a position> as close as practical to the bottom end of the body.v .- „ The means I3 provided for retaining or setting ï the arms in the body may be any suitable means end portion ofthe arm andengages the part B2 members 3i on the cap screws to bear on the to clamp thernrinto the i i outer faces of the arms `marily, a pilot rod £50 slidably carried by the body concentric with the axis of rotation and means in a manner to'clampit tightly against the cutter. My present invention provides an ' improved that will adequately serve this purpose. In the I provide cap screws 30 pilot lconstruction applicable,Í generally,¿to Vrotary ' 3 preferred construction v `.threaded into the sides of the body which are 10 cutters or to cutters operating to make anannu 1 channeled and I provide disc shaped clamping lar cut in the work. My invention provides, pri the cap screws the l channels 2|. By tightening are effectively forced i clamping members 3| Vinrconnection with the pilot rod 6% Vto normally yieldingly ,urge it downward from the lower end . against the arms to lfirmly secure them against 15 of .the bodyv to engage Athe work as the cutter operates. The invention further provides means longitudinal movement in the channels. I4 are elongate bodies of cutting 1 Y The cutters 1 material, such as tool steel, carried in channels ' for retaining the-'pilot rod in the body and a „pressure plate 6i in connection with the pilot 1 35 formed substantially vertically Yin the> outer rod to bear on the work. practice the lower .. ` . In the preferred construction'the body is pro ` end portions of the armsi 2. In end portions of the >cutters Iâ are finished or videdwith arcentral socket 62 extending into it from its lower end. The socket' may be formed dressed so that each cutter has ya lower cutting edge 36. The lower cutting edges 35 of thecut by providing .a central boreintheA body from its lower end. The pilot rod may be a plain,`straight, ters are pitched from the horizontal so that each cutter has a lower cutting point 31 and the two 25 4round .bar which'slidablyV fits l.the ‘socketuâZ and that the point 31 of` thev proportioned so that its/lower end> portion' >pro >cutters are dressed so jects aV suitableV distance ‘fromthe lower >end of cutter A_is at the inner end of the edgeââ while end` thebody It, while `its'upper `end terminates a the point 31 of the cutter Bf is at the outer ' the cutterex-` suitable distance short of the upper end ofthe , 'or the edge se. The sideY 31a of tending up from the lpoint is preferably dressed V30 socke`tlì2'."’V 'mi ' i ' to recede and have clearance vas the A_cutter VA compression _spring ‘63 'is arrangedÈ in vthe> ' socket 62 above the rod '60 orY between the top of the rod and the upper'end of the socket, so ‘that In accordance with my invention the cuttersv it normally ' yielding'ly urges'the' rod downwardly. advances. ’ ' " ' ' ` i4 are disposed so that they do not track ‘1n .eX actly the same paths but rather the cutter A Various means may Vbe provided for retaining operates to cut the inner 'portion or wall of the the rodin .the socket. Inthe construction shown I have provided a reduced portion’ßli at a suitable cut vwhile the cutter B operates to cut the outer point along the length of the rod, that is," at Aa portion or wallof the cut. This 'may be accom poinit'withi'n the body lll, and'ï‘have provided plished by dressing the cutters so thatv their cut ting edges and points are suitably disposed. 40. a stop Yscrew ’S6 in 4the 'bodyto project finto :the However, in practice it is desirable to formthe socket to the reduced portionßä of the'rodït'oiact .Y as a stop limiting the longitudinal mcvem‘entof channels 35 which carry the cutters softha’t the the rod in the socket.i The lower end'portion of g cutting parts of the cutters are properly located. the rod is provided with a' point or` center> 66 in the case illustrated the channel which carries the cutter A supports -it so4 that it is in a truly 45 lwhich may be used to engage the work, " vertical position when viewedas shown in Fig. l, while the channel 35 which Vsupports the cutter B is >pitched downwardly andjoutwardly enough stanceto ,engage to locate the point, 31 of the cutter B a suitable distance outward of the path of the cutter A. " In accordance with rny invention the channels center .holel >erneuter punch mark provided inthe work. I-n‘acocrdance 50 35 Vin the arms i2 carrying theV cutters vlll are pitched downwardly and rearwardly with refer 'with . ’ my inventionIprovi'de .a Vpressure `plate 61 that can be used inr connection’ with 'the' pilot rod.> This vplate may‘beinthe'fo'rm of a disc having" a central'tapered socket ’61 designed to 'be'l engaged bythe point 63 of the pilot rod. ,'The-Ibßlìlìom face SS of the plate Vlili is flat and designed-»to bear on the work, giving a largebearing surface ence to the direction of rotation of the cutter so that the cutting points and edges of each cut 55 ¿to have a clamping effect. When . the tool is yarm and rearward of v being used to cut gaskets, orvthelikeg’forfin ' ter are located below the the point at which the cutter is supported‘by the arm with reference to the direction in which the cutter'is rotated. Y. Thaty is to say, the cutters Ilil stance, whenit is being used on materialsthat are soft or flexible, it is desirable to ._usethe pressure ‘plate 6l as'it 4will have a desirable hold are pitchedY to depend ldownwardly and, rear V60 ingor clamping effect A(in the partr which'is‘icut wardly relative to the directio'nof-cut so that outY by the action of thetool. ' VWhen the tool is 'being used on harder materials or metals "it'jniay their cutting parts are behind the point ati which the cutters are supported by the arms. Through be sufiicient to merely allow the center Gs'ofîthe this construction, should thecutters feed too fast Apilotrod .to engage ra small pilot hole Yor center Y into the material, they willV tend to be forced ' Vpunch markprovided in the work.’ ¿The spring rather than ' back and to lift from the material Y Vt?, mayîbe Ymade ïsucl?ir as `to` exert 'af suitable to bite into it. It is to be understood, of course that theforward >facesrât of the cutters imme diately above the edges 35 are dressed yorffaced may _be varied according _to the :work being'ïdo'n’e. amount of pressure on the pilot rod' and .this so that the cutters give the chips the desired 70 The spring-may be such as to merely provide a holdingpressure to hold >the work in placeborit clearance. may be made fairly strong, so thatA it acts' to _eject . The means l5 provided byl my invention for re !4 in the desired adjustedlpo taining the cutters the .part cutout by the action of Ythe,toolgvjl,v » In using the device .theîarms `L2 are adjusted sition may vary’as circumstances require, . In the 7.5 fito .project the; ' >case illustrated I have shownathe'outer `end por desired :distances ‘fromî theggbody 2,406,442 and are set in such adjusted positions by the means I3. I4 are arranged in the 4. A cutter of the character described includ ing a central elongate body notched at opposite sides to have transversely disposed cutter carry ' ing channels in it at diametrically opposite sides ' parallel to each other and adjacent the lower end of the body, arms slidably carried in the overlap while the path of the cutter A extends inwardly from that of the cutter B so that the cutter A makes the inner portion of the out while the cutter B makes the outer portion of the cut. During the cutting operation the pilot rod, or the pilot rod with the pressure plate under it, bears on the work, - ` channels to project laterally from the body, means applied to the exterior of the body at the sides of the body for clamping the arms in the chan - nels against movement in the channels, and cut ters carried by the projecting end portions ofthe arms to depend therefrom. 5. A cutter of the character described includ ing a central elongate body having laterally dis posed cutter carrying channels formedsin it at diametrically opposite sides, arms slidably car ried in the channels to be parallel with each other and to project from the body, means forV clamping the arms against movement in the chan nels, and cutters carried by the projecting por tions ofthe arms to depend downwardly there the rod and holding the work, particularly the slug or disc portion that is cut out by the tool. . v Having described only a typical preferred kforni and application of my invention,v I do not wish to be limited or restricted to the speciíic details herein set forth, but wish to reserve to myself v any variations or modiñcations that may appear scope of the following claims: Having described my invention, I claim: 1. A cutter of the character `described includ ing a central elongate body having outwardly opening cutter carrying channels formed in it at diametrically opposite sides and at right angles to the longitudinal axis of the body, arms slid n: c.. from and. rearwardly of the direction of cut so the cutting edges of the cutters are behind the points where the cutters are supported by the cutting edge being pitched and termi nating in a cutting point, the paths of cut of the the arms laterally of the longitudinal axis of the body to hold them against movement in the cutters overlapping and the point of one cutter being at the inner end ofthe edge and the point of the other cutter being at the outer end of the ‘ edge. 6. `A cutter ofthe character described includ channels including clamp> members engaging the ving a central elongate .body having outwardly ably carried in the channels to project laterally from the body, means for individually clamping arms to bear on them laterally of the axis of the opening cutter carrying channels formed in it body and a screw member operating each clamp j. at diametrically opposite sides and at right, an gles to the longitudinal axis of the body, arms member, and cutters |carried by the arms to de- f pend therefrom. slidably carried in the channels to project later 2. A cutter of the character described includ ing a central elongate body having open cutter carrying channels formed in it from diametri ally from the body, means for individually clamp cally opposite sides extending at right angles to the longitudinal axis of the body, arms slidably carried in the channels to project laterally from the body, means for individually clamping the ing the arms against movement in the channels,V there being a central opening extending into` the body between the channels, a pilot member carried by said opening to project from the lower end of the body, a spring in the opening normally yieldingly urging the pilot downward, and cutters carried by the arms to depend therefrom. arms against movement in the channels, and cut ters carri d by the arms to depend downwardly 7. A cutter of the character described includ ing a central elongate body having laterally open therefrom and rearwardly of the direction of -cut ing transversely dispo ` so these cutting parts are behind the points at which the cutters are supported by the arms. 3. A cutter of the character described includ ing a central elongate body having transverse 50 cutter carrying channels formed parallel to each other in opposite sides of the body and open at their outer por-tions, arms slidably carried in the channels to project from the body, means for in dividually clamping the arms laterally of the longitudinal axis of the body and against the bottoms of the channels so theyare held against movement in the channels, and cutters carried by the projecting portions of the arms to depend therefrom. LAWSON A. SMITH.