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Sept 17, 1946- “ B. N. ENGLE . INDENTING' DEVICE 2,407,821 . Filed June 15, 1944 2 Sheets-Sheet l MW. . . ._ “ ‘ 4 u//‘ IN. 3_24m 5 a .m "A. / w . __ . 7 4 V a _3 I’ Z'0 5 a 7 w 5 INVENTOR 7/6 , ' ‘Sept. 17, 1946. B. N. ENGLE 2,407,821 INDEN'TING DEVICE Filed- June 13, 1944 2 Sheets-Sheet 2 I I / V [49 63 .6 INVENTOR. Bur-r/V. E'ny/e BY Patented Sept. 17, 1946 2,407,821 “ UNITED STATES PATENT OFFICE‘ 2,407,821 INDENTING DEVICE. Burr N. Engle, Los‘Angeles‘, Calif., assignor to Inga M. Eilgle; Los Angeles, Calif. Application June 13, 1944,. Serial No. 540,167 8 Claims; (01. 76-29) ' 1 , This invention relates to devices and apparae tuses for cutting teeth in various kinds and shapes alined plunger and cutter. of material such as bands, sheets, plates, etc. The invention is- especially adapted? for ' ‘ Other objects, advantages and‘ features of my which‘ require teeth or serrationsof any kind. or ' type. 2' in its guide so- as to assure an‘ even and perfectly ‘ invention will appear from the accompanying 5 drawings, the‘subjoi‘ned detailed description, the reteething old saws, racks and other notched‘ preamble. ofv these speci?cations and. the appended items made of material-wherein the teeth can claims. ‘ ~ be punched out; the kind of material to be Applicant is about to illustrate and describe. toothed ,is of no moment, although the invention one of the forms of his invention inorder to teach would be used mostly upon plastics and metals 10 one how to'ma'ke and use thesame, but it is to in which teeth are to beformed. be understood that the drawings and descrip When old saws and the like are retoothed by tion thereof are not‘t‘b limit the invention in any the use of this invention; the re-toothing opera sense whatsoever, except‘ as limited, by the ap- ' tion automatically punches or forms the new pended claims. ~ : i teeth as it removes the old teeth, and to complete 15 In the; drawings: ‘ r i the job, setting and ?ling is all that is necessary Fig. 1 shows‘a machine designed in accordance in order to provide a perfect cutting saw. to the invention, the same being. in front per To retooth any hand saw in accordance to this. spective view, and‘ end portions thereof being invention, the saw handle should ?rst be re broken away. moved. The blade of the saw is then secured. to 20 Fig. 2 is a vertical cross sectional'v-iew of' a the under surface of a ?anged saw carrier by principal’porti’on of the machine. means of pressure clamps. The ?ange of the Fig. 3 is a front elevational‘v view of a portion carrier is then worked along a set of guides by of the machine with‘ partsbroken away to show a dog which forces the saw and its- carrier to some details. slide over a pivoted plate inv intermittent pre 25 Fig. 3a. is. a cross. sec‘tiontaken substantially determined distances as the new teeth are cut by along the line 3a—3a'of-Fi'g. 3f a reciprocating angled cutter. Means are proFig. dis a front elev'ational‘view of‘a portion vided for ?xing and maintaining the spacing of; of‘ the machine with parts, broken away, but the teeth as the machine operates; and for re showing, the principal working». parts assembled moving the outtings- from the device as‘ freed 30 withia saw to be toothed. from the blade. Fig. 5‘ is a planivi‘ew‘ of ‘Fig. 4. ‘ One of the principal objects-of the inventionuisl Fig. 6 is. a plan view of the saw carrier and to present an automatic tooth cutting machine’ shown on a smaller scale, the rack thereof being that is sturdy and simple in- construction, removed. economical to make and manufacture, and de 35 Fig.. 7 is. a. vertical cross. section of- the carrier pendable for giving perfect results-and long wear ofiFig. 6. and service. Another object of the invention is-to provide a‘ Fig. 8 is. a side elevationalview of one of the guides. tooth cutting machine with a reciprocable cutting‘ Fig.. 9 is. a. fractional. part of the machine punch and ?x die that is adjustable in a p1u-' 40 shown in. plan. view with a different setting‘ of the movableparts. rality of directions, one of the adjustment direce tions being especially arranged‘ to allow‘ a new The entire tooth cutting.- device or. machine is. mounted upon a hollow ?anged-supporting table. alinement of the ?xedl ‘die with the top pivoted‘ I which table has ?xed to the. top thereof,.as by plate of the machine‘after‘grinding and‘ sharpen 45 bolts 01'. any‘ other suitable means, an electric. ing of the ?xed die. motor. 2" and. the cutting machine‘ indicated in Still another object is‘ toprovide' a saw carrier general by the numeral 3. The machine has a which is adjustable. for straight and curved aline ?anged hollow supporting base. unit 4. which sup ment of the new teeth along the working edge of the saw, coupled‘ with means for adjustingthe. 50 ports a. working, bed.’ plate. 5' in ?xed. relation thereto through the medium'of the lugs 6 andthe pitch of the opposed edges of the teeth of the fastening. bolt‘s?i" on either side thereof. ‘Note saw so as to provide ‘a wide range of teeth aline Fig. 4. The unit‘ 4 also supports the‘ plunger ment and tooth pitches. ‘ And a still further object is to provide adjust housing 1, which is integral‘with the shaft'hous ing 8 extending therefrom, as" shown; A’ cover‘ able means for wedge-?tting, the cutting plunger 55. 1' closes‘ the‘ chamber‘ within the. housing. 2,407,821 3 the bevelled surface 45 along its entire length. An adjusting strip 46 is provided that has a cross section of a right triangle, the hypothenuse sur face of which is abutted to the bevelled surface 45 of the block to provide a gib or wedge-like adjust ing strip. Spaced along the cover 1' of the hous wheel, not shown, on the rear end of the motor shaft H. The insulated cable [2 provides the motor with suitable electric current at the re ing are a pair of adjusting screws 41 and 41' which quired voltage through the toggle type control switch l3. 4 36, one corner of the block is cut away to make Mounted upon and keyed to a shaft is a ?ywheel type pulley wheel 9 having about its perimeter the usual groove to accommodate the endless pulley belt 15 which is connected to a pulley are threaded to their respective bores in the cover, - At each end of the working bed plate 5 there is 10 and the ends of which are adapted to press against the front surface of the adjusting strip a curved slot indicated at I4 and i5, positioned as shown, through which pass their respective, _, when the screws are turned inwardly. By tight ening the strip 46 against the block, the block is bolts l6 and [1. These bolts are adapted to forced into snug engagement with at least two threadedly engage the threadedlbores of the walls 'of the guide chamber, and this is for the shanks of the turn knobs l8 and ,l,9,»the.knobs being designed to hold down a pivoted plate 20 I V purpose of avoiding any loose play of the block within its chamber and thus maintains the male in a predetermined ?xed position when same are die element 30in perfect alinement with the fe screwed against the top surface of the plate '20. male die so as to out true on each stroke. At about the center of the plate 25 is an aperture A saw 48, in which the new teethare to be out,v is shown positioned upon the plate 20 and held thereon by the spacer carrier means 43, C-clamps 56 and 52, and the guide clamps 53 and 54. The 2!. I The plate 5 has an aperture 22 of the same. 20 size as 2| and similarly situated, both of these ' apertures accommodating a cylindrical female die element 23' having the V-cut 24 therethr'ough, carrier means is best shown in Figs. 6 and 7 and , note Figs. 2 and 5. The bottom of the die element 23 sits in an annular recessed portion, of a do? 25 consists of upper and lower'plates 55 and 56 re spectively, each having the integral upstanding pending boss 25 which is integral with the plate flanges 51 and 58 respectively, which upstanding 5, this boss having a set screw 26 threadedtheree ?anges form a groove 59 adapted to snugly re in, the top end of which engages the bottom of ceive the rack, notched spacer bar, or track 65. the ‘die element so that the element may be raised At one end of the groove is a. stop element 6| a. trifle after each grinding ‘thereof and thus which prevents the rack being forced along the maintain aperfect level between the ‘top of the groove when pressure is applied" thereto, that element and the top of the pivot plate 26. _In is, the pressure for shifting the carrier a prede order to dispose of the cuttings and keep the top of plate 20 clean and unobstructed, a hole 27 is termined distance forv the next tooth cut. The upper and lower plates 55 and 56 have the lon gitudinal slits 62 with the ends of the slits re enforced with welds 63 to prevent rupture at these points when the slit is opened and closed provided through the boss which allows the cut— ' tings to drop onto the top of the table 1. The apertures 2| and 22 are a little oversize so that the die element can be shifted a tri?e. A set screw 28 threaded in the plate 5 ,is provided to fix and hold the‘ die element 'in position; For ?nal adjustment and alinement of the female die with the male die, the holes 6" are madeoversize 40 so that the plate 5 can be shifted a. little in any direction before the bolts ,6’ are tightened. 'Above the V-cut of the female die element is the male die element or die plunger 30 integral with a circular stop ?ange 3| and the cylindrical shank 32; the shank passing through a lever plate 33 and snugly into a, bore at the lower por tion of a reciprocatory ram or slide block 34 which is a portion of a scotch‘ yoke about to be described, the male die, however, being held in position by a set screw 35. ' chined guide chamber 36 having at its middle portion a circular shaped chamber 31. A' remov able cover 1’ is provided at the front side of the chambers 36 and 31 and acts as a side of the guide for the ram. ‘At the upper rear portion of the slide block there is a rectangular slot or cross cut 39 arranged to receive a rectangular and reciprocatory slip element or block 40 which is - A crank pin 4| snugly ?ts a bore 42 in the slip element and has one end thereof integral with and at the edge of a circular crank arm 43 which is integral with one end‘of the power shaft 44. According to the aforesaid construction, the slide block and its male die element 30 will reciprocate vertically as the slip element an is rotated by the power shaft. ‘ Note that the male die will recipro catevertically regardless of the direction of roe tation of the power shaft.‘ ‘ ‘ ‘ f ' plate and the front of the clamp ?rmly together when the slit has been opened the degree desired to hold a ?xed arc in the rack. The ram 34 is positioned in the carefully ma free to ride along the cross cut 39. 50 a number of times. The purpose of the slit is to give the rack or track 60 a predetermined curve when it is desired to cut teeth in the saw blade along a slight arc thereof, a feature very desir able on carpenter hand saws to aid its cutting action on the harder‘woods. In order to hold the slit open, a plurality of clamps 64 are employed. Each of the clamps consists of a metal strip hav ing its rear edge 65 welded to the top surface of the carrier plate 55, and a slot 66 through which passes a threaded stem 6‘! having its bottom end welded or otherwise ?xed in bores of the plates 55 and 56. A wing nut 68 is used to hold‘the . When narrow saws or bands are toothed, the front edge of the plate 20 is in the way of the C-clamps 50 and 52. To obviate this difficulty, the front edge of this plate is made removable. The removable section is shown at‘20' in Fig. 2. Screws 20" are employed to hold the section in place when needed. ' The rack or track 60 is removable as it is held in the groove only by a friction ?t. A plurality of such racks are provided having differently spaced, teeth or notches along the top thereof, the spacing of the teeth in the various racks being predetermined to satisfy the requirementsof the tooth spacings desired in the band, plate or saw being toothed. A dog 16 is loosely pivoted at ‘H to the lower end of a bell crank 12 which is piv oted at .13'to a standard 14. The upper arm 15' of the bell crank has its free end in contact with the top of the lever plate 33 and is kept in con In order to provide ‘a dependable. adjustment tact therewith by the pull action of the tension for the slide block 34 within its guide chamber ' spring 16, which spring has one end ?xed to the answer 51 ' screw at‘ the pivot 11-‘ and the» other‘end? fixed‘ to‘ a» hook whichri‘s- attachedtoa portion‘ ofithel compression clamp-1 53‘. A lug extends from the standardl'and: supports‘ a set- screw‘ 11 having the winged‘ lock-nut 18;. The purpose otthisscrew lslto provide an adjustable-stop for thebell crank‘ so that the dog can be adjusted to'fall'back either one or; two or more’ notches or teeth‘ on. the‘ rack rod. 60. Obviously, when larger teeth'are cut‘, the dog: should be: adjusted, by the screw 11», to cause’ greater advancement of ‘the saw‘ carrier- 49 @when the l‘even plate 33 is-lifted”. . The pressure clampsidand. 54 each consistof a triangular-like body 80f. which is bored and. tappedltoireceive a screw: for mounting of‘ samev 6 provided as; standard equipment; any tooth.‘ size" from4=toli1> points; oribetter, canbe out.. By loosening thextwohand wheels or knobs-.18 and? IS; the pivoted plate 20. maybe swung in a. horizontalipl'ane; aroundthe female: die.23$ soi'that. item be set‘ easily.‘ and quickly to‘ establish. the correct angle to producethe desired. cross-cut or rip-cut teeth... As; the pivotplate; cannot get. out Off line; it, is not‘. necessary to‘. change the saw blade; setting on: the carrier‘ when once ?xed'or make any other adjustment thereof. New teeth, are punchedmne: at a time. rapid succession as: the blade. is. advanced: under. the. guidance of.‘ the. bandi spring: ends; 81 by the ac— upon-the plate 2.0, the. small lip: 81 at’the: rear preventing turningof- the-‘clamp. A- stepped por:tion 80’ at the front of the clamp providesin'eces tion ofrthe; dog ‘#9, the: dog, making. one stroke. forward. for each upward stroke of the. male. die’ 3.9.‘. Ateach downward stroke of: the male cutter, sary. recessescfor thecarrier- and" plate when the same; are. abutt'edl againstitheiclampr The body. has the?oore ?zxwhi'ch: is tapped and: receives-the. lower portion of: aespring-tension: adjusting‘ screw 83.. about: which isrcoiled'a; compression spring 84. Mounted upon. the. front inclined, surface. of the clamp. is a. sturdy lband. spring" 85;. shaped. as shown, having; the; front end?ange. 8.6, the ‘ end of out: portion of; the; blade‘ is completely freed of the female die. as; all the. punchings pass‘ on. down‘ thist‘?ange; at. 8.1, being-carefully rounded‘ so that itrwill smoothly slide. along thetop. ofithe, carrier plate. 55; just. forward‘... of: the. flange. 5'! thereof. anew out is..made.in; the; blade and thepunched ‘ through the.femalediethrough the hole 21 and onto the table top; l. V _ The foregoing operation: makes completely new teeth arranged in a straight line. If it isdesired ;; to punch the teeth along, acurved line, the winged nuts 68 are loosened on theclamps 6d‘ and the slitGZ widened to. the desired degree of‘ curvature, Wanted upon the. cutting edge. of the saw blade,‘ and. then these clampsare tightened to maintain the-?anges; 51-‘ and ;5.8:are; placed between 0 ,. thecurvature‘ until-thecutting, is ?nished; other the.S clamp :bodyBIl and the.efnd 8] of the. band wise, thesettings are the same. as mentioned above spring. the carrier. of: the Saw is; guided: along a for‘ the straight line cuttings.‘ predetermined; straight; or'curved. lineat. any angle It is,ofcourse, understoodthat, various changes‘ to which, the plate, 2.0. hasbeen set; and, modi?cations may be. madein the details of Aszyclearly shown in Fig. 9, of; the drawings,_the 1;}; form, style, design and'construction of the whole saw; carrier‘ isaillustrated; to Show it; as set; at. a or any partof. the speci?cally described embodi rather: sharp. angle with, respect; to the plate 5 ment of this‘ invention. without departing from which makes;the-.new teeth:4_8b shaped for a rip the spirit thereof, such-changes and modifications saw-rather thanfor a cross; cut; saw. as, shown in Fig. 5. The old, teeth of thesaw are indicated at. 48c so, that: the reader- can get av pretty; good idearegarding the; relative, positions of the. vari ous, plates; and the. carrier.. Note-that the-slit,‘ Fig. 9, is~wel1 openedso that; the track 60 is. in the-form of a great arc, thus the new teeth are. being restricted only 1by the limitations clearly expressed. in the. following claims. Having thus described my invention, what is claimed as. newand desired to. be secured by Letters Patentis: . 1. In a. notching. device for bands, blades, plates, etc.,,a supporting means having male and formed along; the great arc. Insteadof the saw 45 female die elements attached thereto and ar 43! having a straight line, of. teeth as. in the saw ranged to contact one another, power means con48:, thepteeth. of saw. 48.’ will be along a line hav nected with one of. the elementsfor moving it ingza. slight curve,‘ the. degree of the;.~curve de intoland out of contactwith the other element, pendinguponthe width of the-.slit?Z... 50 a, bed. plate, a carrier for holding and moving the thing to‘ be notched,.plate means supported General operation by the bed plateand having a snug, ?tting bear The. general operation offthe invention, asillus- \ ing means with one of the die elements so as to trat_e_d,._concerns the retoothing offa carpenter’s. be. set inv any one. of a plurality of angular posi hand saw... The. handle. should‘?rst be. removed. 55 tionswith respectto the other die element, guide means, ?xed to: the plate means and in contact and the blade securedfunder the carrier by means with the carrier to direct it along a de?nite path of the, two C-cl’amps 50 and,v 52. These clamps have a. spring‘ tension. of ‘ about 20 pounds each across a‘ portion of one of the elements, operat and theyv hold‘ the saw blade ?at onto the pivot‘ plate 20 and also hold the saw carrier against the guide blocks 8!). Proper tension for feeding the ing means for automatically moving the carrier a. predetermined distance at each stroke of the moving element, and clamping means for hold ing the thing to be notched on the carrier for saw blade beneath the cutter 30 and positive movement therewith as each notch is cut. alinement during the cutting or punching opera 2. In a notching device for bands, blades, tion is thus obtained. The V-shaped female die is stationary, while 65 plates, etc., as set forth in claim 1 wherein the ?xed die has material depth for frequent grind the triangular shaped punch reciprocates rapidly ing, under support means extending from the bed under power from the electric motor 2 via the plate and beneath the said other element, micro connections of the scotch yoke, shaft, ?ywheel adjustable means connected to the under support type pulley, and the endless pulley belt. The means for bringing the ground surface of the said 70. pawl or dog mechanism 10-45 advances the rack, other die in substantial alinement with the top or toothed index bar 60, one tooth on each press surface of the plate means, and means through cycle. The number of teeth per inch on this the bed plate to pass chipped pieces and prevent index bar determines the number of points on clogging of either die element. the saw blade 48. By using various index bars, 75 3. In a notching device for bands, blades, ‘ ' 2,407,821" plates, etc, as set forth in claim 1 wherein the, like, a yoke supporting a male and a female die in combination with'means for moving one of moving die element is attached to a reciprocating the dies into cutting relation with the other, table block having arectangular cross section less a means for holding the work piece in position with longitudinal corner portion thereof, a housing respect to the dies, feeding means for moving around the block to form a guide for the block, CR the work along a de?nitepath with respect to a wedging strip along the longitudinal corner the dies, one'of the diesconsisting of an element portion of the block, and micro-adjusting means having a plurality of cutting edges so that said extending through the housing and in contact one of , the dies can} be repositioned and bring with the strip for urging the strip against the a new sharp cutting edge into working position, 10 block so that it will snuglyabut a portion of the said, feeding means comprising an elongated L guide. . 4. In a notching, device for bands, blades, I plates, etc, a supporting means having male and ' female die elements attached thereto and ar ranged to contact one another, power means con 7 nected with one of the elements for moving it into and out of contact with the other element, a bed plate, a carrier for holding and moving the thing to be notched, plate means supported by the bed plate and arranged thereon to be set , in any one of a plurality of angular positions with respect to one of the elements, guide means ?xed to the plate means and in contact with the car rier to direct it along a de?nite path across a portion of one of the elements, operating means for moving the carrier a predetermined distance at each stroke of the moving element, and clamp ing means for holding the thing to be notched on the carrier for movement therewith as each notch is out, said plate means having a narrow con?guration, a‘strip removably attached to one of the longitudinal edges of the plate means for increasing its width to present a wide surface to accommodate wide bands, plates and blades to shaped plate, guiding means'for allowing the L shaped plate to slip along the top of the table means, said plate having an elongated slit sub the length thereof, adjustable holding 15 stantially means for maintaining the slit at various widths so as to give one edge, of the Lp-shaped plate an arc shape. , i ' - _ '7. In a notching device for bands and the like, a supporting means having-male and female die elements attached thereto and arrangedto con tact one another, power means connected with one of the elements for moving it into and out of contact with the other element, a bed plate, 25 a carrier for holding and moving’the thing to be notched, ‘plate ‘means ‘supported by the bed plate and arranged thereon to be 'set‘in :any one of a plurality" of angular alinements with respect to one of the elements, guide means ?xed to the‘plate ‘means and in contact with the car- rier to direct ‘it 'along‘a de?nite path across a portion of one of the elements, operating means for moving the carrier a predetermined distance at each stroke of the moving element, and clamp 35 ing means for holding the thing to be notched be toothed. ' onto the carrier for movement therewith, an in 5. In a notching device for bands, blades, dex bar ?xed to the carrier, dog means connected plates, etc., a supporting means having male and to the moving die and with the bar for intermit female die elements attached thereto and ar tently shifting it predetermined distances at each ranged to contact one another, power means con stroke of» the moving die element. 40 nected with one of the elements for moving it 8. In an indenting ~- device for plates, bands, into and out of contact with the other element, etc., a yoke supporting a male and a female a bed plate, a carrier for holding and moving die, means connected with one-of the dies for the thing to be notched, plate means supported moving it, an angular adjustable plate means by the bed plate and arranged thereon to be '- supported by the yoke and having a bearing set in any one of a plurality of angular positions means surrounding one of the dies which acts with respect toone of the elements, guide means as a pivot for the plate means, a carrier plate ?xed to the plate means and in contact with the to carry the thing to be indented and which has carrier to direct it along a de?nite path across one edge thereof serrated, means ?xed vto the a portion of one of the elements, operating means 50 plate means for engaging a portion of the carrier for moving the carrier a predetermined distance plate and guide it in a predetermined line with at each stroke of the moving element, and clamp respect to the dies, said dies comprising a plunger ing means for holding the thing to be notched having three flat walls with equal angular cut on the carrier for movement therewith as each ting edges where they join together and a socket notch is out, said carrier comprising an elongated 55 to receive the plunger, a crank arm pivoted near plate having a slit lengthwise thereof, adjustable the serrated edgerhaving one end thereof .pro means to hold the slit open and cause one of vided with a dog which works on the serrated the longitudinal edges of the carrier to form an edge and another end thereof connected with a are so that the thing to be notched is notched portion of the male die for movement therewith. along a curved line. ‘ 6. In an indenting device for plates ‘and the 60 . , BURR N. ENGLE.