US1482186A - Sheet-metal drafting instrument - Google Patents

Description

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E. F. FALES SHEET METAL DRAFTING INSTRUMENT original Filed Dec. 10 1919 4 Sheets-Sheet 2 Emanue? Ffbla Jan. Z9 1924. 1,482,186 E. F. FALL-:s

SHEET METAL DRAFTING INSTRUMENT original Fild Deo. 1o, 1919 4 sheets-sheet a v Q Emanuel FEZ@ Jan. 29, 1924. n i 1,482,1@5

E. F. FALES SHEET METAL DRAFTING INSTRUMENT Original Filed Dec. l0 1919 4 Sheets-Sheet 4 Patented Jan. 29, 1924.

EMANUEL Ii. FALES, 0F "WILMINGTON, NORTH CAROLINA.

SHEET-"iETAL DRAFTING INSTRUMENT.

Application filed December 10, 3:5519, Serie-l No. 343,783.

To @ZZ whom 'it muy conce/Mi Be it known that l, @MANUEL F. FnLns, a citizen of the United States. residing` at Nillnington. in the county et New lmover and State olf N Carolina, have invented certain new en d useiul improvements in She-et- Metsl Drafting instruments et wl'iich the following` is a specification.

This invention relates to draftingr instruments and more particularly to an improved device adapted for marking sheet metal whereby proper guide lines may he indicated on the metal for the purpose or" guiding the worker whcrehy the ine-tel may he properly eut without waste.

ln the art oit sheet metall working, it is necessary :For the workmen to either tirst provide himself with properly cut pattern, or to ley out.v hy means of the various rules known the art an exact or proximate pattern ot' work en the sheet metal. It is Otten necessary to secure the services of sheet metal dia'ltsinan in order that the lay out of the werk will he enact und in order that the pattern will he eccurete so that the finished product will meet the required dimensions. it is the purpose of the present invention, there-tore, to provide a means for marking` work accurately oy merely first setting` the instrument in the proper manner, by rules which can he readily learned by the ordinary workman.

The invention contemplates the provision et an instrument which will overcome .many ot' the dii'imiculties encountered by sheet metal vorkers who are required to 'form irregularly shsped products such as found in the piping and fittings ot Ventilating systems.

Figure 1 .is a perspective view of one term Renewed December 27, y1923.

Figure 7 is a detail perspective view ot the central portion or" one of the disks.

Figure 8 is a transverse detail section showing the manner ot holding one ot the marking` elements in position.

Figure 9 is a plan view of a modified form et disk.

Figure 10 is a section taken on the line 11G- 10 ot Fig. 9.

Figure 11 is a view similar to Fig. 10 showingthe modified form ot disk in curved position.

Figure 12 is a perspective view ot a modiiied -form or" the invention. illustrating an additional markingdisk mounted in posii tion.

Figure 13 is a detail view of apointer element which may be employed in operating the instrument.

Figure lli is a detail view illustrating the positions which the sections 16 and 17 ot the disk may assume when certain configurations are to be marked on the sheet metal, the marking elements in this view icing removed.

Figure 15 is a detail section taken through the connecting disk approximately on the line 15-15 oit Fig. 12.

Figure 16 is a perspective view of a modified form ot marking," disk.

Figure 17 is a top plan view of a further modification.

Figure .1S-is a `view of the modification shown in Fin. l?. inverted.

Figure 19 is u section on the line i919 of Fig. 18 lockingr in the direction of the arrows.

Figure 2O is a vertical section on the line 20-20 ot Fin. .il looking` in the direction oi' the arrows.

Fie/'ure 21 is a moditied `form of marker.

Figure 22 is sectional detail on the line 532-22 ot Fig. 20.

Corresponding and like parts are referred to in the following description and indicated in the several views oit the drawing by like reference characters.

Referring to the drawings, wherein is illustrated the preferred form ot my invention.y in which like numerals of reference indice-.te like or corresponding parts throughout the severa-l views7 the shank of the linstrument is composed o two rods 2 and 3. The end of the rod 2 is provided withy a disk i which has one surface provided with graduations indicated at 5 which represent degrees and vtrac-tions ci degrees of a com-l plete circle. rllhe adjacent end oil the rod zl is provided With a circular plate 6 which is equipped with a pointer 7 having its terH minal disposed in a position to indicate the graduations 5. The plate l is provided With a screw threaded aperture and the plate 6 has an opening 'through which the screw threaded shank ci a thumb nut 8 ma;7 be extended. rlhus the tWo plates i and 6 may be tightened together for holding the rods and 3 at any angle with respect to each other. The opposite end of the rod 3 is threadedly engaged with a removable extension rod 9 shown to advantage in Figs. l and 2, and this extension projects into a sleeve member l() which is adapted to receive the greater portion ot the rod 3 and the extension 9 when the tivo members 3 and 9 are thrust inwardly into the sleeve thus permitting longitudinal adjustment of the shank. A set screw lil carried by one end of the sleeve is adapted to lock or hold the parts in adjusted position. The sleeve l() is provided with oppositely extending arms l2 which have reduced portions 1? in alineinent with each other, tiese reduced portions forming pintles for the hinges 111-. A. disk l5 comprises the substantially semi circular portions 16 and l? having` their proximate edges hingedly connected by means oit the hinges le which are arranged so that they will be flush with the opposite surfaces of the disk. it is to be observed that the pintles .i3 project outwardly toward the edge oit the disk at diametrically opposite points and these projected portions of the pintles are sharpened to provide the pointers 18, the purpose ot which will presently appear. Vfhile the disk Yl5 is termed in separate sections lo and il? which are really independent parts, the disk Will be hereinatter relie red to as the circular membei' comprising' the semi-circular sections i6 and i7. The rod 2 forming the opposite portion ot the shank is also provided with a sleeve l() which is constructed in the same manner as above described` and which includes the arms l2 supporting the opposite. disk l5. The disks at the opposite ends of the shank, therefore, are ot the same construction so that a detail description of' one will sullice. llach disk is provided, near its edge, Wit-h a plurality olf circumterentially spaced openings Yi9 shown in detail in Figs. 6 and 8, The openings are countersunk and receive the screws 20 the heads of which are received in the countersunk portions et the openings so that the heads will lie :flush vwith yone surface of the disk. Each bolt or screw 20 is provided with an elongated openine` 2l. The openii'ie; 2l in each bolt 2O receives a marker 22 which is adapted to extend radially from the edge ot the disk.

rlhere may be as many markers as desired according to the number of holes provided in the disk and each marker comprises an elongated rod oi any desired length having opposite ' dat surfaces 23 and 24 and a pointed end Mounted upon each bolt or sores7 2() is a thumb nut or a Wing nut 26 and, as shown in Fig. 8, these nuts willV serve to securely maintain the marker element 22 in position when the nuts are tightened. The nuts clamp the marker elements against the surface of the disk and the points ot the markers may be adjusted toward or away from the edge of the disk so that the points may be disposed in the desired position. Yinasmuch as the meet-ing edges of the sections lo and 17, Will prevent the disposing of an opening` 19 at the exact transverse center oit the disk, the openings adjacent these points are oiifset as shoivn in Fig. l, and the markers 22 provided at these points have oilset pointed ends as indicated at 27 so that the pointed ends of the markers Will be in properly spaced relation and the spots indicated by the markers when the instrument used, will be equally spaced apart.

Each section of the disk l5 is provided, adjacent its central portion With the ears or lugs 29 which connect With an actuating rod 30 which has its opposite end joined to a sliding sleeve 3l on the member l0. rfhe sleeve 31 isI provided with spaced apart ears Ylor connecting the rod 30 to the sleeve and the latter is equipped with a set screw 32 whereby the slidable sleeve 3l may be iiXed in position on the sleeve member i0. Both ot the sleeves 3l are independently movable on the sleeve member l0.

Since the central portion of each disk 15 is open as provided by the separated edges of the sections '16 and 17, it Will be aneasy matter for the user to determine the center ot the disk when the instrument is in use, and in order that this may be accurately determined, I have provided a centering point 34 as shown in detail in Fig. 7. One oit the sections of the disk is provided at the center ot' its straight edge with the pointer member 34 which projects toward a notch or recess 35 provided at the same point in the corresponding section i6. The lpoint ot the member 84 terminates at the exact -center of the disk l5 so that the user oit the implement in endeavoring to place the implement in position on a piece of Work, may strike a center point, and then place the implement in position so that the member 34- indicates the center point, thus being assured that the disk l5 will be centrally located With respect to the point which has been struck on the Work. Y A

Fig. 3 illustrates the manner in which the marker elements 22 may be adjusted to have the points indicate geometrical ligures ot different shapes. (.in'iously the marker element may be oi any desired length and a supply et these n'iarker elements may be .kept on hand in order that the instrument may be supplied with marker elements of the proper length.

ln `liigs. 9, 10 and l1 of the drawings, l have illustrated a slightly modified .form of disk, which comprises a plurality of sections 88, 39, 40, ell, 42 and i3 all ol which are hingedly connected together as indicated at le and which are so shaped as to form a perfectly circular disk when the sections are disposed in a plane as shown in Fig. 9. The meeting edges of the sections e() and el, have their hinges provided with the pintles formed by the arms 45 which are equivalent to the arms l2 in the above described form, so that this form of disk may be attached to the members l2 if desired.

With reference to the pointer 60, it is desired to set forth that the disk 58 is an integral part of the auxiliary rod 57 and the shank of the thumb screw provides an axle tor disks 6l and G2, either oi' which may rotate independently upon the thumb screw to vary the angle 0i' either disc A or B. The graduations oi' the disc 62 will provide means for cooperation with the pointer 60 tor accurately determining the angle at which the disc B is set, and the edges of the two discs 6l and 62 may be provided with corresponding graduations whereby the former may be set from the latter. This disk is also provided with a plurality of equally spaced openings near its edge through which bolts are extended whereby the marker elements l? may be secured in position by the fastening members 4S which may be thumb screws or wing nuts as desired. ln order that the disk may be formed into an arcuate shape as illustrated in Fig. ll, the sections are thus hinged together and it will be obvious that thel user of the implement may move the various sections so that the pointer elements will be disposed in a position similar to that illustrated in Fig. ll. ln order that the sections may be held in this position while the instrument is in use, the pintles L9 may be provided with jam nuts 'fior tightening the hinged portions of the sections together in order that the desired rigidity may be secured. Obviously any other form of tightening means may be employed to maintain the sections in the desired rigid positions.

Fig. 12 illustrates the manner oi assenig bling the various parts for providing a use of the implement when more complicated patterns are to be .marked or cut. To one the rod sections of the shank. preferably the rod section 2, is attached a sliding sleeve 5l which may be adjusted and held in position by a set screw 52. Telescopically mounted upon the sleeve 51 is the tubular extension 53 which has a set screw 54 at each end. At the end opposite the tubular sleeve 5l, is another sleeve 55 also provided with a sere i 56 and this sleeve receives one end of the aus liary rod 57 which is similar in construction to the 3 in the above described ici-m, and has the disk` member 58 provided with opening through which the screw threaded shank of the set screw 59 is extended. rihe disk 58 is also provided with a pointer 60.

The disk and the adjacent interconnecting parte including the sleeve portion l0 and the connecting or operating rods 89 may be termed heads Vtor the implement and it will be obvious by virtue oi 'the construction set *forth that two, three or 'four heads may be provided with the Yform shown and described in l2. To accomplish this purpose, therefore, a pair oit the disk iinembers 6l and 62 are assembled together on the shank of the set screw 59, these disk members being exactly the same as the disk member l in the above described form. By pivotally moving the disk members on the shank of the set screw 59, the two adjacent heads indicated generally at A and B, may be disposed at a l desired. angle with respect to each other. liv hile the disk A is shown in the present instance without the marker elements it is thought advisable to point out that the impleinent may be provided with or without the marker points. That is, if it is found that the disk is of the desired circumference, the edge ci "he disk may be employed to make. the necessary markings on the work, and if desired different sizes of disks may be employed in this connection although it will be round more practical and convenient to provide the disk with the adjustable markers as above referred to. l do not desire to limit myself, ho'\.ve'\.rer.` to the provision ou" marl s on the disk, and consequently have illustrated the plain disk indicated at il.. with the marker elements removed therein idr means ot the structure shown in T1igj. l2. the shank may be longitudinally adjusted to any desired length and obviously other tubular members, simii to the tubular member 53 muv be inserte.d in pcsiznon in order that t .-e shank of the Aiinplernent may be extended 'tor con- .rabie lei jgth if desired. also the auguiosition the heads A. and B with reto each other. and w' respect to the slank may changed as nj 'iosening and tightening e set scr 9. The anar positions oi may be determined by observing graruations on the disks 6l and 62 with respect to the pointer element 6G on the stationary disk 5S.

LIC

L se some torrns of pa it will be necessary to move the sections or the disks tc be disposed at an angle with respect to each other, and when 'this is desired, the movable sleeves lll are longitudinally adjusted on the sleeve member l() and the sections oit the dislr moved to the desiree angle and in order that this may be acc rately determined without the use o'l" a protractor or the like, the sleeve l() is provided with graduations 6d indicating` degrees and fractions oli degrees that the exact angular positions ol the sections of the disk can be accurately deter- .nined, as shown in Fig. l2.

The Viorm of device illustrated in Figure l2 may be used to advantage in laying` out patterns 'for three way trunks, which are usually adapted to lit openings in the corner of a room. ln the present adjustment shown in Figure l2,l the adjustable points oli the disc C are disposed to term a circle, while the adjustable points 22 of the disc B and the adjustable points which may be provided upon the disc A, are set to form ellipses. These adjustments are made so that two trunks of the litting' will be elliptical. and the other circular at their open ends. Now, to lay out the pattern, the device illustrated in Figure l2 is arranged upon the sheet of metal simile-r to the device illustrated in Figures l and 2, so that the stem 53 will be arranged horizontally and will provide means for rolling` the device in dilinerent directions. The device is arranged upon the metal so that the points il, R Yand M of the three discs touch the metal. A line from G to R. on the metal will represent the seam and the starting'` point for the patter The stem 53 is then rocked so that the disc C is elevated and the discs B and A rock or roll until points O and D thereon touch the metal. The stem is then moved to its original position, after which it is rolled to the left oit the figure in its own course until points l, lll and F touch the metal. After this, the stein is tilted upwardly until the points and D again touch the metal after which the device is rolled upon kthe discs A and C until the points Gr and B touch the metal. This operation brings the device back to the starting; point and completes the 'Hat pattern which when 'formed up will fit openings corresponding; to those at the ends of the three way trunk.

j Only one of the disks may be employed at certain times during the use of the implement and in order that a point may be established from which the disk may be swung, l have provided a means whereby one end of the shank of the implement may be properly disposed in position for permitting the disk to swing. ln Fig. 13, I have illustrated one manner ol' laying off a pattern for a cone and inasmuch as the longitudinal center line of the shank must coincide exactly with the point on the surface of the material ,1A-cales at which the implement swings, it will be noted that l have indicated the center line and the point at which they intersect. rlhe pivot point carries a stationary disk 66 which has mounted thereon a movable disk 67, the two disks beine; provided with a ball and socket joint 68 whereby :tree movementl will be permitted. The disks are held in assembled. relation in any desired manner and the movable disk is equipped with an arm 69 suitably curved and provided with a recess 70 to receive one end of a shank l whereby the longitudinal center line ol the shank l will intersect the point on the surface of the material to which the pointer element 65 extends, so that whenv the material is marked out and properly cut, a conical shape will be provided.

To lay out a pattern for a cone or pyramid, the adjustable marking points on the disc associated with the shank l shown in F igure 13 are adjusted to fit a polygonal, circular or any other shaped base. The disc is then adjusted along the stern so that the distance between the former and the point 65 represents the height of the cone or pyramid. The point 65 is then placed upon the sheet of metal and retained in position while the disc and stem are rotated about the point through a complete circle. The points marked by the adjustable marker are then connected so that the pattern may be cut out and formed into a cone or pyramid.

As above set forth, the implement is especially designed for marking out sheet metal work, and the form shown in Fig. l may be the form generally used, inasmuch as this form ol the implement may be employed lor marking` out the simple patterns. Assumin that a sheet metal tubular member is to be formed, having a circular opening at one end and an elliptical opening` at the other and the circular' opening is to be in a plane at an angle with respect to the central aXis of the pipe, the implement will be set in the manner shown in l. The elliptical opening is formed by arrangingr the markers in the manner shown at the lower portion of Fig. l or in the manner indicated in Fig. 3 of the drawings. The major and minor diameters oit the ellipse are iirst obtained and the pointers set accordingly. The opposite disk is then tilted. at the angle desired at the opposite end of the pipe and the markers on this disk set to indicate a circle of the desired diameter. Then, by taking the implement and rolling' it like an aille and a pair of wheels over the surface of the material, the points will indicate dots on the material and the user may draw lines through the dots to provide guide lines whereby the material may be readily cut. It desired, the pointer elements may be inked and 4they may also serve to indicate the properly spaced rivet holes when the material is to be riveted together. This example illustrates one of the uses of the instrument and it will be readily appreciated that the more complicated patterns may easily formed by 'disposing the various parts in various angular positions one of which is indicated in Fig. l2 of the drawing.

In Fig. 16 I have illustrated a slightly modified forni of disk, the saine comprising a circular member formed of segmental sections 78, 74 and 7 5. Section 73 is substantially semi-circular in iormation and the sections 7 l and 75 are quarter circular in formation. The standard 71 is rigidly attached to the semi-circular section 73 and each ot the quarter circular sections 74 and 75 are provided with arms 7 8 and 79. These arms are attached to the collars 76 and 77 respectively on the shank 71 so that the sections 74 and are permitted to turn on the shank. rillhe quarter circular sections are also disposed in a plane whereby they may swing over the surface of the semi-circular section 73 as shown, so that sections may be overlapped to :torni a partially circular disk having an open space which may be adjusted to any desired width. To maintain the parts in their proper relative positions after being set, set screws are provided in the collars 7 6 and '77 whereby the collars may be rigidly secured to the shank. This form of disk will be found to be of valuable utility in marking patterns for forming three-Way littings, and the disk may be provided with the marking elements if desired, or the edge of the disk may be employed tor the marking of the material.

I have lfound from my experience with the implement that the use of tour heads instead of three as indicated in Fig. 12 is possible, although not exactly practical for the reason that the pattern shaped with the use or' four heads is not as economical or as easily assembled as when a less number oi' marking heads are employed and the pattern divided into a greater number of independent sections to be riveted together. However, the use of three heads as shown in Fig. 12 is especially advantageous as it per mits the workman to quickly lay oil patterns 0In unusual form and design which would otherwise require careful calculating and drafting well known in this art. The use of short rules7 and jump rules77 coinmonly employed by ordinary workmen in laying out sheet metal patterns will be practically eliminated by the use ot the present instrument and a great saving in material and time will be accomplished. Any workman unfamiliar with technical sheet metal drafting and calculating can readily acquire skill in the using of the present instrument so that the patterns of any desired form may be quickly laid olf and marked so that they can be accurately cut.

In the modification shown in Fig. 17 and the detail views thereof, the device is de signed more particularly for outlining constructions embodying 3 or more branches whereby pipes may radiate from a common point. For a cluster embodying three branches the adjustable plates will be set one third the distance, whereas tor clusters embodying tour branches the adjustable plates will be set one fourth the distance. The main or primary plate is indicated at 16a and the adjustable plates or sections at ica The main plate or section 16a is of semicircular form whereas the adjustable plates or sections 17a are one fourth of a circle each. The main plate 1Gn is formed with arcuate slots 16h which receive the tastenings 16 by means of which the plates 17a are adjustably connected to the plate 16a. The plates 17a are liingedly connected as indicated at 17, the hinge pin 131 being detachable and pointed so as to be used as a centering element or marker as desired. The plates 17l are adapted to be arranged at right angles to the plate 16n and hingedly connected to the plate 16a in substantially the same manner as indicated in Figs. 1 and i2. The several plates are provided with hinge knuckles which are adapted to receive pintles 13il which are detachable thereby admitting oit the plates 17a being disengaged from the plate 16 when the device is adapted tor outlining a multiple cluster of three or more branches. It is to be understood that the several plates will be provided near their outer edges with openings 19 which are adapted to receive markers 22 which are adjustably connected to the plates by tastenings 2O in substantially the manner herein indicated.

The sleeve 10a has the extremities oi1 its arms 12a formed with threaded openings or slits to receive the threaded ends of the hinge pins 13a. rllliese hinge `pins have their outer ends pointed and formed with polygonal portions 13b, tor the reception ot a suitable socket wrench whereby the hinge pins may be screwed into or unscrewed from the extremity of the arms 12a. The several plates are 'termed with pointers which enable them to be accurately positioned. The plate 16a is 'formed with a centrally disposed pointer 16d whereas the plates 17a are formed with pointers 17d. The extremities oi the pointers idd and 17d are disposed at a common center as indicated most clearly in Figs. 1".y and i8 thereby insuring their correct positioning. The sleeve 10a is formed at its extremity with an integral clamp 10b whereby it may be secured to the supporting or carrying rod.

Figure 2l indicates a modified form of marker which admits o a number of niarking points being incorporated in a single marker. ln this figure 23 indicates the pli CTI mary marker and 23a the auxiliary marker. fr clamp 23h serves to adjustably connect the auxiliary marker to the main marker. In this connection it is observed that there may be as many auxiliary markers as desired. This construction admits of the plates beine provided with a minimum number oit openings 19 and a maximum number of markers,A it being understood that there may be two or more markers for each of the openings, depending upon the number ot auxiliary markers provided for each main marker.

rlhe foregoing description and accompanying drawings have reference to what might be considered to be the approved or preferred form of my invention. I desire it to `be understood that l may make such changes in the construction, combination and arrangement of part-s, materials, dimensions, et cetera, as may prove expedient and fall within the scope of the invention as claimed hereinafter.

Having thus fully described my invention what l claim as new and desire to secure b'y- Letters Patent, is

1. A. drafting implement comprising a. shank, a disk mounted on oneend thereof, and a paiil of disks mounted upon the opposite end of the shank, said pair of disks being adjustable relatively to each other and to the shank. f

2. A sheet metal draf-ting implement comprising a shank, disks mountedupon opposite ends of the shank, the said disks comprising hingedly connected sections7 and'means carried by the disks to provide markers when the disks are rolled over the sheet metal.

3. A sheet metal drafting implement comprising a shank, comprising pivotally conuected rods, disks mounted on opposite ends of the'rod, and means connecting the adj acent ends of the rods to permit relative :wirgingy movement, and means to adjust the relative positions of the said disks on the rod.

4T. A sheet metal drafting implement com nrising a plurality of disks means connecting` the disks together for simultaneous movement, when the instrument is in use, each disk comprising hingedly connected semi-circular sections, and marking implements circumferentially spaced on the said semispherical sections.

5. A sheet metal draf-ting implement coniprising substantially circular disks each composed of hingedly connected semi-circular sections, means to maintain the disks in relatively fixedv position, and marker elements carried by and projecting from the edges of the said disk.

6. A sheet metal drafting implement comprisinncircular disks for-med in sections. hingedly connected together and equipped on opposite ends of the shank, disks supportcd the sleeve members and including independent sections, each sleeve member having supporting` arms forming pintles, the said sections of the disk being provided with hinge elements connected to the said pintles whereby independent angular ad-` justment of the sections of the disk may be permitted, and means mounted on the said sleeves and connected to the sections to maintain the angular positions of the said disk sections.

9. A sheet metal drafting implement comprising circular marking elements longitudinally spaced apart, an elongated shank connecting the marking elements, and means whereby the said marking elements may be disposed in angular relationship.

10.1%. sheet metal drafting implement comprising substantially Circular disks equipped with radially extending markers, an elongated shank composed of sectionsv having their meeting ends pivotally joined together and their opposite ends connected to the said disks whereby the'said sections of the shank may be swung to angular positions with respect to each other for dis# posing the said disks in angular relation.

il. A sheet metal drafting implement comprising circular disks composed of hingedly connected sections, each section provided with radially projecting markers, and means to join the said disks together whereby they may be angularly adjusted with respect to each other, and means to permit angular adjustment of the sections in each disk with respect to each other.

12A sheet metal drafting implement comprising a shank, a marking element carried by the shank and includinga pair of substantially semi-circular sections hingedly connected together, slidingv elements mounted upon the said shankl and means connecting the sliding elements with the said semi-circular sections, whereby the said sections may be adjusted with respect to each other by sliding the said members on the said shank.

sheet metal drafting implement including` a shank, a sleeve mounted on the shank, the said sleeve having diver-ging arms, a disk including semi-circular secions hingedly connected together, pintles formed on the ends of the said diverging arms7 the said disks having their hinged sections received over the said pintles whereby relative movement ot the said disk .sections may he permitted indepenccn of each other, and marker elements carr by the said disks.

14:. A sheet metal drafting implement including a shank, a. sleeve adjustahly mount-- ed on the shank, a disk including hinged conn cted semi-circular sections, the saV sleeve being connected to the said hinged portions of the sections, and means longitudinally adjustable on the sleeve and connected the said sections whereby independent adjustment ot the sections with ect to each other may he made by adsaid members on the said 'iisting the sleeve.

5. A. sheet metal drafting implementinimg a shank, a sleeve attached to the i nk and longitudinally adjustable thereon, diverging arms secured to the sleeves and having their terminals shaped to proide pintles, a disk including semi-circular sections provided ivith ringe elements adapted to register and receive the said pintles whereby swinging movement ot the said sections will be permitted, and means to adjust ne said sections with respect to cach other by swinging them on the said hinges.

162A sheet metal drafting implement crunprising a shank, a. sleeve attached to the shank, a disk including hingedly connected semi-circular sections supported by the said sleeves, and adapted for independent swinging movement, sleeves mounted on .ne said Erst mentioned sleeve itor slidj nent, and connecting rods joining the said slidable sleeves With the said disk sections permit independent moi/'ement ol* the said disk sections with respect to cach other.

il'. A sheet metal drafting implement comprising a shank, sleeve attached to the shank, a disk including semi-circular sections provided with openings near its marginal edges, the said sections being hirgedly connected together and mounted upon one end or" the sleeve, and markv cr elements projecting 'from the marginal edges; of the said sections.

18.4K sheet metal drafting imple? comprising plurality oi marking heads pivotally connected together and provided with markers disposed in circumierential spaced relation.

i9. A. sheet metal drafting implement comprising a plurality of marker heads each including a disk having radial markers projecting therefrom, a shankfor each head, and disks connecting the Shanks for l clu sl a pivotal movement with respect tc each 20. L sheet metal drafting implement comprising a plurali ci' marking heads, each including a disk having Shanks attached thereto, pivotal connections for the said shanlcs, and nie-'uis to permit longitudinal adjustment o: t! i said shanks Wherehy the said disks may he adjusted toward and away troni each other.

Qi. sheet drs comprising a shank, a marking disk secured to the shank and comprising relatively movable sections.

22. A sheet metal draiting implement comprising a shank, a circular disk secured to the shank and equipped with radially projecting marking elements at its marginal edge, the said disk being composed or hingedly connected sections.

23. A sheet metal drafting implement comprising a shank, a substantially circular disk mounted on the shank and comprising hingedly connected sections, adapted to be moved out ot level plane to dispose the different sections at angles with respect to each other, and marker elements arranged near the curved edges ot the said sections.

24C. A sheet metal drafting implement comprising a shank, a disk attached to the shank, and comprising substantially semi circular sections, hingedly connected to gether, each of the sections being provided with circumferentially spaced openingsastening elements extending through the openings, and including screws provided with elongated apertures, and marker elements adapted to he ertended through the apertures and in contact with one surface oi the said disk whereby the said fastening elements may engage the said marker elements to maintain them in firm engagement with the said disks to be held against displacement.

25. A sheet metal drafting implement comprising a shank, a disk mounted on one end of the shank and including hingedly connected sections having fastening elements arranged in circumferentially spaced relation around their edges, and marking elements including straight shanks engaged with the fastening elements and adapted to be radially adjusted to vary the position of the ends ci' the marker elements with respect to the center of the said disk.

26. A sheet metal drafting implement comprising a shank, a disk mounted on one end of the shank and including hingedly connected sections having fastening elements arranged in circumferentially spaced relation around their edges, and marking elements including straight Shanks enga ed With the fastening elements and adapte to lie Wliall;7 adjusted to ra the position or the ends of the marl-.ier ei nents with respect to the center oil? the sairi disk1 an` means to indicate the center of "elle saicl disk.

27. A sheet metal drafting implement comprising' a shank, a marking element connected to one end oi? the shank and adapted to be rolled over the material being marked, a pivot element7 and a universel joint connectingy said shank and said pivot element.

28. A sheet metal drafting implement Comprising a shank, a, marking member connected thereto and adapted to be rolled over the material to be marked, and a second marking` element connected to the `irst named markingy clement and arranged in a plane intersecting that of the first mentioned marking element.

29. A sheet metal drafting implement comprising a shank7 a semi-circular plate movably associated with the shank, and a metal plate axljustably oonneeted to the semi-circuiar plate and arranged in a plane intersecting; the plane of the semi-circular plate.

30. A sheet metal drafting implement comprising shank, a. plurality of arms each having; an end terminating in a dia-l.y said dials being` arranged in Contact with one another and pivotaly associated with the shank, and a marking element connected to each of said arms and arranged at right angies thereto.

In testimony whereof l aiiix my signature ir. presence of two Witnesses.

J. G. LEA.

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