US2733741A

US2733741A - lindee

Info

Publication number: US2733741A
Authority: US
Publication date: 1956-02-07
Anticipated expiration: 1973-02-07

Description

4 Sheets-Sheet l Feb. 7, 1956 c. F. LINDEE, JR

COMBINATION LATHE AND DRILL PRESS Filed Nov. l0, 1953 Carl .E .Zinc/ee. Jr.

Feb. 7, 1956 c. F. LINDEE, JR 2,733,741

COMBINATION LATILE AND DRILL PRESS Filed NOV. l0, 1953 4 Sheets-Sheet 2 Invenor Cal'/ F. inc/ee, Jr.

Feb. 7, 1956 c. F. LINDEE, JR 2,733,741

COMBINATION LATHE AND DRILL PRESS Filed Nov. l0, 1953 4 Sheets-Sheet 3 fnvenor Cczr/ F. Ll' dee, Jr;

CMQ/k Feb. 7, 1956 C, F, LINDEE, JR 2,733,741

COMBINATION LATI-IE AND DRILL PRESS Filed' Nov. 10, 1953 4 Sheets-Sheet 4 lum j "i [n1/en for United States Patent O ce coMrNArroN LATHE AND DRILL rnnss Carl F. Lindee, Jr., Chicago, Ill., assignor to Portable Electric Tools, Inc., Chicago, lll., a corperation of linois Application November 10,1953, Serial No. 391,336

Claims. (Cl. 1441) This invention relates to multiple purpose machine tools adapted for wood-working and like operations and wherein the basic elements of the tool are adapted for rearrangement and readjustment so as to adapt the basic tool for the performance of many different types of Work-performing operations.

In the past there have been many different kinds of multiple purpose machine tools adapted particularly for performance of a variety of wood-working operations, and most of these prior tools have been intended and adapted for use as a lathe, as a vertical drill press, and for association therewith of various attachments whereby still further types of wood-working, finishing and like operations might be performed through the'use of the basic elements of the tool. Most of the prior multiple purpose tools of the aforesaid kind have been relatively complicated and expensive, so that the tools have not been the subject of wide distribution or use. It is therefore an important object of the present invention to simplify the structure of multiple purpose machine tools and to utilize the basic elements thereof with greater efficiency, thereby to reduce the manufacturing cost of such tools and enable a wider market to be reached.

Other and related objects are to afford an improved multiple purpose tool ofthe aforesaid character in which the basic elements are so related and associated that a high degree of strength and rigidity may be attained in the tool through the use of a minimum of material.

Other and more specific objects of the present invention are to improve the structural forms and relationship of the elements of such a multiple purpose machine tool, 'to simplify the mounting and use of the tool, to simplify the mounting and adjustment of the various parts and attachments on and with relation to the basic elements of the multiple purpose tool, and to afford such a multiple purpose machine tool that is unusually well adapted for economical manufacture and for convenience of use and operation. Y

Other and further objects of the present invention will be apparent from the following `description and claims and 4are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment of the present invention and the principle thereof and what I now consider tobe the best mode in which I have contemplated applying that principle. Other embodiments of the invention embodying the same or equivalent prin- -ciple may be used and structural changes may be made as desired by those skilled inthe art without departing from the present invention and the purview of the appended claims.

in the drawings:

Fig. 1 is a plan View of a multiple purpose tool embody ing the features of the invention, the tool being located in v the relationship wherein it is adapted for use as a lathe;

Fig. 2' is a frontelevational view of the tool;

Fig. 3 is a rear elevational view of the tailstock taken from the line 3 3A of Fig. vl;

Fig. 3A is an elevational view, .taken partially in longi- 2,733,741 Patented `Feb. 7, 19156 tudinal section, and showing the tailstock shaft or ram; Fig. 4 is a vertical sectional view taken substantially along the lines 4 4 of Figs. 1 and 3;

Fig. 4A is a cross sectionalfview taken substantially along the line 4A 4A of Fig. l;

Fig. 5 is a cross sectional view taken substantially along the line 5 5 of Figs. l, 2 and 3;

Fig. 6 is a left hand end elevational view of the headstock taken Vfrom the line 6 6 of Fig. l;

Fig. 7 is a right hand end elevational View of the headstock taken from theline 7 7 of Fig. 1;

Fig. 8 is a plan section of theheadstock taken substantially along the line 8 8 of Fig. 6;

Fig. 9 is a vertical sectional View of the headstock taken substantially along the lines 9 9 of Figs. 6 and 8;

` The general organization For purposes of disclosure, the invention is herein illustrated as embodied in a multiple purpose machine tool 2n which is adapted for use as a lathe when the parts are arranged as shown in Figs. l to 4, or for use as a vertical drill press when the parts are arranged as shown in Figs. l0, ll and l2, and which, through the association of various attachments, may be utilized for other kinds of working operations such as have heretofore been performed with lathes or with other specialized tools. Since the tool 2% may function as a lathe, the structural elements will be described herein as applied to such functioning, but it is to be understood that the terms thus` employed are not used as terms of limitation since the various elements may have different functions in different uses and adjusted relationships of the tool;

Thus the multiple purpose machine tool 20, as herein shown, comprises a headstock 21 and a tailstock 22 adapted` for mounting on a supporting surface 23v such as a bench, and adjustably connectedtogether by means. in cluding a pair of parallel connecting bars 25` that are made from steel and are ofv circular cross section and which are related to the headstoc 21 and the tailstock 22 in a particular manner, as will hereinafter be described in detail.

The headstock 21 under/the present invention isadapted to removably receive and position a power source that is afforded by a conventional portable electrically operated drill Z6 that is so located on and with respect to the headstock 21 that the conventional screw-threadedoutput shaft ZS of the drill 26 constitutes the headstock spindle of the tool. This headstock spindle` 26S that is thus afforded is arranged so that it may receive a driving spur center or headstock center 27 which is, in the assembled relation of the tool 2i), aligned with a tailstock or dead center 23 that is removably mounted as by threading at 29T on a tailstock shaft 29 that is mounted in the tailstock 22. v

The structure of the headstockV 21 is described in detail in my copending application, Serial No. 391,268, filed November l0, 1953, and reference may be had to such copending application for further details of .such structure, but it may be pointed out that the headstock 21 is formed from a pair of end plates or

castings

21F and 21R that are held in a spaced relationship by an internal spacing bracket 30 that is Vsecured to the inside faces of the end castings` 21F and 21R. The

end castings

21F and 21R have bottom surfaces 31 formed thereon and defined by mounting flanges 31F, and these `mounting surfaces 31 are disposed `in a plane that is parallel 2,733,741- f Y f f Y, n n

to the axis of the headstock spindle, and such surfaces 31 Y are adapted to rest upon a mounting surface such as the bench 23. The headstock may be secured to the mounting bench by fastening means not'shown, passed downwardly through slots 32 formed in the edges of the flanges 31F, as shown in Fig. lof the'drawings.

The tailstock 22 is formed with a mounting surface 33 that is parallel to the axis of the tailstock shaft 29, and for purposes that will appear hereinafter, the tailstock 22 also has a mounting surface 34 at its right hand end, as shown in Figs.V l and 2, such mounting surface being perpendicular to the surface 33 and the axis of the tailstock shaft 29. This provision of

surfaces

33 and 34 at right angles toeach other enables the tailstock 22 to be mounted in the position shown in Fig. 2 with the axis of the tailstock shaft 29 in a horizontal position, or to be mounted in the position shown in Fig. of the drawings wherein the axis of the tailstock shaft 29 is disposed in a vertical relationship with respect to the mounting bench 23. This changing of the position of the tailstock and the related elements serves to lit the tool for use as a lathe, as illustrated in Figs. 1 and 2, or for use as a vertical press, as shown in Figs. 10 to 12, and the movement of the tailstock between these positions is preferably facilitated through the provision of a pair of oppositely projecting coaxially pivot pins 35 disposed at the juncture of the

surfaces

33 and 34 and extending beyond the side edges of the tailstock 22, as shown in Fig. 2. These pivot pins 35 may thus be held in a predetermined relation to the mounting surface 23v by means such as securing clips 36 that embrace the pivot pins 35 and which aresecured to the bench 23 by means such as screws 37.

The edge of the tailstock 22 on which the pivot pins 35 are formed in thus held in the proper location, and when the tailstock is in the position shown in Fig. 2, the opposite or left hand edge of the tailstock may be held in engagement with the bench 23 by means such as a rotatable fastener 38 secured by a Vertical screw 39 to the bench 23 and adapted by rotation about the axis of the screw 39 to be placed in or removed from an overlying or holding relationship with respect to an edge or ange portion of the tailstock 22. The secure mounting of the tailstock 22 in its different relations is also facilitated by

edge notches

33N and 34N formed respectively in the plates 33P and 341), these notches being used to receive fastening screws where this is desired.

The connecting rods 2S are preferably of circular cross sectional form and may be in the form of hollow or solid metallic rods. As herein shown, these rods are of solid cross section and are disposed in spaced parallel relationship so as to be located in a vertical plane that passes through the axes of the headstock spindle 26 and the tailstock shaft 29, and such rods are parallel to the

lower surfaces

31 and 33 of the headstock 21 and the tailstock 22. As will be pointed out hereinafter, this relationship is important in that it imparts a high degree of rigidity and strength to the tool for resisting the major forces that come into play in the use of the tool. Such rods 25 serve, of course, to afford an adjustable connection between the headstock 21 and the tailstock 22 and to position and locate these elements with respect to each other, and the rods 25 also serve as a mounting means for additional'elements of the tool such as a steadyrest t0 that is adjustably secured on the rods 25 by means including an adjustable mounting bracket 41.

The headstock The details of the headstock 21 are described and claimed in my aforesaid copending application, but it will be observed in Figs. l, 2 and 6 to 9 of the present drawing that the headstock 21 is formed from a plurality of separately formed parts, including the

end castings

21R and 21F. Thus, these end castings are joined together in the desired endwise spacing and in rigid relationship bythe connecting bracket that is made in the form of a casting to atord a relatively heavy longitudinal bar 30B and transverse vertically positioned end walls SlW that are braced with respect to the bar portion 30B by means of triangular webs 30X.

End castings

21R and 21F are adapted to be secured to the open end webs 30W of the spacing bracket 30, and for this purpose, the end castings have projecting pads .46 on their inner faces that are adapted tol bear against the opposed flat sur faces of the end webs 30W. Four such pads 46 are provided in the present instance on each end casting, and bolts 47 are extended through the pads so that they may extend somewhat loosely through locating notches 48 that are formed in the upper and lower edges of the end webs 30W. Nuts 47N are threaded onto the bolts 47, and after establishing the desired accurate relation between the end castings and the bracket 3i), the nuts 47N are tightened so as to clamp the end webs 30W against the pads 46 and thus secure the

end castings

21R and 21F in the rigid and accurately established relationship with respect to the spacing bracket 30. It will be noted that the spacing rods 25 extend through opening 25H in the

end castings

21F and 21R, and similar openings are provided in the end webs 30 W of the spacing bracket The

castings

21R and 21F have bottom flanges 31F as hereinbefore described, and these anges each have a pair o-f mounting notches 31N formed therein through which mounting or securing screws may be extended into a bench or mounting board when independent mounting of the headstock 21 is desired. The castings 21R and y 21F have vertically extended walls that are curved at their front and rear edges, as indicated at 49, so as to add strength to these castings, and this is particularly important since the connecting bracket 3Q is associated with the

end castings

21F and 21R relatively close to the lower edge portions of these castings. At their upper edges, the end castings are also curved as at Si), and this results in a pleasing appearance in the exposed surfaces of such castings. l

Between the

end castings

21R and 21F a forward wall portion of the headstock 21 is'aiorded through the provision of a relatively thin sheet metal cover plate 51 that extends between the end castings and is located with its vertical edge edge portions in outwardly facing rabbeted grooves 52 that are formed along the upwardly and rearwardly extending edges of the forward sides of the end castings. At the lower edges of these castings, the edge of the cover sheet 51 is bent inwardly and upwardly as at 51A, Fig. 6, about the lower ends of the anges that alford the rabbeted grooves 52, while the upper edge of the cover plate 51 is bent downwardly into a locking relationship as at 51B, it being noted that the flanges that form the rabbeted grooves 52 terminate at this upper point to afford end edges about which bending of the cover plate 51 may bevaccomplished.

The spacing bars 25 are adjustably clamped to the connecting bracket 30 of the headstock 21, and this is accomplished by extending a clamping bolt 54 horizontally and in a rearward direction through the bar portion 30B so that this bolt will pass between the bars 25 in an equally spaced relation thereto. At its forward end, the head 54H of the `bolt'5'4 is disposed between a pair of ribs 55, as shown in Figs. 8 and 9, so as to hold the bolt against rotation, and at its threaded rear end, a clamping bar 56 of U-shaped cross section is placed over the bolt so that complemental upper and lower side edge portions of the clamping bar 55 will embracingly .engage the rear faces ofthe two bars 25. A clamping nut 57 threaded on to the rear end of the bolt 54 may be rotated by means of a cross bar 58 to clamp the bar 56 against the two rods 25, and this serves to adjustably position the headstock 21 with respect to the bars 25.

Y Means are afforded on the headstock 21 for locating an electric drill 26 accuratelyY in such a position that the ,output shaft of the drillconstitutes aheadstock spindle,

and in accomplishing this, means are afforded on 'opposite ends of the headstock for engaging the drill and positioning the same with `respect to the headstock. In respect to the end casting 21F, such locating means are afforded by providing a circular opening 60 that has an annular rabbeted groove 60R defined aroundits inside surface, and this opening 60 and the groove 60R are made substantially larger than the largest bearing hub 26H, Fig. 2, that would normally be encountered in conventional electric drills. These bearing hubs 26H take different forms in drills manufactured by different manufacturers, and as described ink detail in my aforesaid copending application, means are affordedfor enabling different sizes and different shapes of such bearing hubs to be accurately centered with respect to the opening 60.'

`This is accomplished through the provision of a separately formed ring 62 that has its outer annular surface shaped complemental to vthegroove 60H, and the inside surface of the locating ring 62 has its surface 62B formed to accurately engage the outer surface of the hub 26H of a drill in such a way that the output shaft of the drill will be coaxial with the outer annular surfaces of the ring. Hence, when the ring 62 supports such a hub in the rabbeted groove 60R, the forward end of the drill is accurately centered upon the axis of the opening 60 so that the output shaft of the drill may constitute the headstock spindle.

At the other or rear end of the drill, the requisite centering is afforded by clamping means that are arranged to clampingly engage and accurately locate the rear end of the drill through cooperation with suitable locating surfaces on the rear end of the ldrill 26. As herein shown, such clamping means cooperate with locating surfaces afforded by a projecting headed screw or stud 65 that may be mounted in a threaded opening that normally is provided in such drills in accurate alignment with the axis of the output shaft of such a drill. This added stud 65 has a tapered center hole'formed therein, and the clamping means `are arranged to .engage this center hole, as will be described hereinafter.

To accommodate the handle portions of the drill, the end casting 21R is cut outas at 66, and this cut out portion is arranged to have a rearwardly extending, upwardly facing lower surface 67 that affords a shoulder against which one side surface of the handle 126 of the drill may engage, as shown in Fig. 6 ofthe drawings, thus to afford an eccentrically located reaction point for the rotative forces that are applied ina counterclockwise direction, Fig. 6, when the tool is operated. It will be evident that in this location the controlling trigger 26T of such drill will beV readily accessible, and that the trigger lock 26L will also be extended upwardly and will be readily accessible to the user, as shown in Figs. l and v6 of the drawings.

The clamping and locating `means for the rear end of the drill are afforded by a clamping bar 70 that is mounted on the projecting end of a stationarily located clamping bolt 71. The headed inner end of the clamping bolt 71 is located between and held against rotation by ribs 72 Vformed internally on the` wall of the bracket 21R, and this bolt extends through the center point of the clamping bar 70 `and has a knurled clamping nut 73 threaded thereon. Where the bar 70 is to cooperate with the center hole` of a stud 65 or the like, the opposite ends of the clamping bar 70l1ave extending centering pins 70S and 70L formed respectively thereon and these centering pins are of different lengths and have conical ends for purposes that will appear' hereinafter. j One of the centering pins is adapted to be engaged lwith a center hole 74 that is formed `in the outer yface of the end casting 21R in the plane of the bars 25, andit should also be observed that the clamping bolt 71 is also in this plane. Hence, when the lower one ofthe centering pins is located Vin the `center hole 74, the upper one of these pins willbe locatedin this same plane, andthe rlength of the clampingbar 70 and the spacing of the centering` pins are such that under the circumstances described, the upper one ofthe centering pins will also be located on the axis that is desired for the headstock spindle. will be recognized of course that where the upper end of the bar 70 is to cooperate with differently formed and dierently positioned locating surfaces `on a `drill 26, the

upper end of the bar 70 may be provided with differently formed engaging, means complemental to the locating surfaces that are to be engaged. When the clamping nut 73 is tightened, the endwise forces applied to the drill 26 lare transmitted to the locating ring 62 and to the rearwardly facing surface of the annular rabbeted groove 60G.

The provision of two different lengths for the centering pins 70S and 701?. enables different lengths ofdrills to be readily and easily mounted in the headstock, and it should be observed that the clamping bar 70 is relatively small so that it will extend into the hand opening of a saw-drill where such drill is to be mounted in the headstock. While the use of different lengths ofl centering pins on the clamping bar 70 enables a limited variation or difference in the length of the drills that may be mounted in the headstock, it should be observed that the spacing bracket 30 and the cover plate 51 are the only elements that require change where other lengths of drills need to be mounted in the headstock. This simplifies manufacturing and inventory problems.

The tailstock The details of `structure of the tailstock` 22`V are shown in Figs. 3 to 5 of the drawings, wherein it will be evident that the surface 34 ofthe headstock is formed by a plane 34T which constitutes an integral part of the tailstock casting, while the other surface 33 is formed by what may be termed a discontinuous plate-like structure 33p, and these two

plates

33P and 34P are rigidly interconnected by a structure which affords positioning and clamping surfaces for the rods 25 as well as an elongated generally cylindrical mounting and guiding sleeve 75 for supporting the tailstock shaft or ram 29. The'sleeve 75 has a longitudinal bore 75B formed therein that of course extends parallel to the plate 33P and is located a substantial distance upwardly from the plate 331), as shown in Figs. 3, 4 and 5. One end of `the sleeve 75P "is supported by and cast integrally with` the plate 34P,

while throughout its length, the sleeve 75 is supported by a web-like front wall 76 that extends upwardly and rearwardly from the forward portion of the plate SBP, this wall 76 being joined integrally with the plate 34P throughout its entire upward extent. vAt the'other, or right end of the wall 76, as viewed in Fig. 3, an upwardly extending partial end wall 77 is formed integrally with the sleeve `75 and the adjacent end of the wall 76, and this serves further to impart rigidity to the sleeve 75.

Within the space defined by the plate 34P, the front wall 76 and the partial end wall 77, means .are afforded for accurately locating the rods `25. Thus, as shown in Figs. 3, 4 and 5, a horizontal web 78 is extended rearwardly from the inner face of' the wall 76 at a level slightly above the level of the upper rod 25, and just forwardly of the location of the rods 25, adownwardly extending wall 79 is provided which is joined integrally at its upper and lower ends with the web 78 and the plate SSP, as best shown in Fig. 5. Adjacent to its ends, the wall '79 has formed pads Si) formed thereon which have longitudinal grooves 80G formed therein that are complemental to the outer surfaces of the rods 25, and the location of the Vrods with respect to the tailstock is adjustably fixed by clamping of the rods 25 against the surfaces or grooves 80G. Such clamping is accomplished by means including a clamp bari82 that is of U-shaped cross section and is identical with the clamp bar 56 hereinbefore described. Thisclamp Abar 82vhas3clamping notches 82N formed in positions for engagement with the sides of the two rods 25, and arclarnpin'g bolt 83 extends rearwardly through the wall '79, between the two rods 82 and through a central opening in the clamp bar 62 so that a clamping nut 84 with an operating cross bar 85 may be threaded onto the clamping bolt 85 for clamping the clamp bar 82 against the rods 25.

' In the xing of the work piece between the headstock and tailstockcenters, and for other purposes as will be described, the tailstock shaft or ram 29 must be moved longitudinally in its mounting bore 75B, and to enable this to be done, an operating handle 36 is provided on the tailstock. -At its lower end, the operating lever 86 has Ya slot 86S formed longitudinally therein, and this slot embraces a reduced portion of the clamping nut 84 which thus forms a fixed pivotal center for the lower Vend of the operatingl lever 86. The lever 86 extends upwardly and along an elongated clamping pad 7e? that is formed on the rear face of the mounting sleeve 75, and this pad 75P has an elongated slot 75S formed therein which opens through the pad '75P and into the bore 75B. Near its rear end, that is, its left hand end as viewed in Fig. 3A of the drawings, the tailstock shaft or ram 29 has a screw threaded opening 29S extending radially thereinto, and a headed clamping bolt 88 is extended through an opening 86A in the handle 86 and is threaded into the opening 29S. The clamping screw S8 has a head 88H and a cross bar 88B, and the bolt SS serves to transmit movement from the operating lever 36 to the tailstock shaft or ram 29. Thus the ram 29 may be moved longitudinally from the fully retracted position shown in full lines in Fig. 3 to or toward an extended position that is shown in dotted lines in Fig. 3, and when it has reached the desired position of longitudinal adjustment, it may readily be fixed in this position by tightening the clamping bolt 88 which serves to clamp the lever 36 firmly against the opposed flat surface of the pad 75l.

The lever 86 is utilized in this manner in clamping and releasing the work between the headstock and tailstock centers, and is also used in raising and lowering the work on a suitable work table when the tool is used as a verti- `cal drill press, and this aspect of the structure will be described in detail hereinafter.

The steadyrest The steadyrest 40 is adjustably supported on the rods 25 by means of the bracket 41, and the details of this bracket and the steadyrest are illustrated in Figs. l, 2 and 4A of the drawings. Thus, the bracket 41 comprises an angular casting that has a horizontal arm 41H and a vvertical arm 41V that extends downwardly from the horizontal arm 41H. The vertical arm 41V has its rear surface formed with horizontal arcuate grooves 141 therein in spaced relation so that these grooves will tit against and embrace'the forward side surfaces of the rods 25, and a clamping bolt 90 extends rearwardly through the arm 41V and between the two rods 25. A clamping bar 91 that is identical with the clamping bars 56 and 82 hereinbefore described is placed over the rear end of the bolt 90, and a clamping nut 92 having a cross bar 95 is screw threaded onto the projecting rear end of the bolt 90. The nut 92 may thus be tightened toV clamp the bracket 41 in any desired position along the rods 25.

The forwardly projecting arm l1H of the bracket 41 has a longitudinal slot 1418 formed therein, and on one Lbepositionedin any '.one ofthe vertically extending grooves 141G; thus to locate the steadyrest 40 securely in any desired spacing forwardly'of the working axis of the tool. VThe rod 40R is adapted to be clamped in any one of the grooves 141G and is adapted to be clamped in any desired vertical position of adjustment with respect to such grooves. In accomplishing this, a split clamping block 95Y is placed in an embracing relationship with respect to the rod 40H, and across the split side of the block 95, a clamping screw 96 is provided whereby the clamping block may he clamped in any desired vertical position along7 the rod 40B, and such clamping serves to hold the rod MPR against rotative displacement in and with respect to the clamping block- 95.

The clamping block 95, at the edge thereof that is opposite from the location of the screw 96, has a screw threaded opening formed therein, and a wing headed clamping screw 97 lextends through the slot 1418 and into this screw threaded opening'.4 lt should also be observed in Fig. 2 of the drawings that the arm 41H is U-shaped or channel-like in form, and this channel opens to the right in Fig. 2 of the drawings. The edge of the clamping block 95 that is engaged by the clamping screw 97 is arranged to extend into this channel, and it will be observed that when the clamping screw 97 is tightened, the rod 0R will be clamped tightly in the notches or grooves MiG, and the block will beheld rmly against any undesired angulary displacement which might cause the steadyrest lil to assume an improper position with respect to the other elements of the tool.

The magnetized clamping bars The assembly and adjustment of the elements of the present tool are materiallyrsimplied by so constructing the several clamping structures so that the assembly of the clamping devices may be readily and easily performed. Thuswith respect to the clamping bars 56, S2 and l, provision is made under the present invention whereby such clamping bars will be magnetically held in place while the related clamping bolts, brackets and clamping nuts are put in place. While this result may be accomplished by magnetizing the steel rods 2S, or by associating these rods with opposite poles of a permanent magnet, I prefer to attain the result by magnetizing the individual clamping bars. These clamping bars 56, 82 and 91 are made from a magnetizable ferrous metal. and have engaging surfaces complemental to the surfaces of the steel tie rods 25, and such clamps are magnetized so that when these formed engaging surfaces are put in place against the rods 25, an effective magnetic path is provided therebetween and the clamping bars will be held in place. The user then has both hands free for holding and manipulating the clamping bolt and nut.

The use as a vertical drill press With the structure that is thus afforded, it will be evident that the tool may be shifted readily to an upright position that is shown in particular in Figs. l0 and ll of the drawings, and to enable this to be done, it is merely necessary to adjust the rods 25 so that the right hand ends thereof are located within the tailstock 22, and to release the holding member 38. may then be rocked to the upstanding position shown in Figs. l0 and 1l, and additional rotatable fasteners 101 which are similar to the fastener 38 may be rotated into position as shown in Figs. 1l and 12 to maintain the tool in its upright position. In such upright position, the tool may readily be adapted for the performance of vertical boring and similar operations. This is done by removing the headstock center 27 and replacing it with the usual chuck such as the gear chuck 102 shown in Figs. l0 and l1, and in this respect it is to be observed that such chuck 102 is merely rotated upon the threaded portion 26S of the output shaft of the portable drill 26. The chuck -102`serves to support a drill bit 103,

The entire tooland awork piece such as the work piece W'may be mounted on a table structure 104 which may be in" the form of a conventional face plate that is adapted for other uses in connection with the present tool. This face plate 104 is mountedon the screw threaded end 29T g of the ram 29, as will be evident in Figs. 10 and 1l of Structural advantages In the tool structure that has been described hereinabove, it has been found that exceptional and unexpected rigidity of the working elements of the tool has been attained, and this has been accomplished without embodying` unduly large structural members in the tool. Thus in a tool of this character, one'of the important considerations insofar as work-performing capacity may be concerned is the throat dimension or swing, and this dimension constitutes the distance between the work supporting axis of the tailstock and headstock and the closest connecting member such as the upper connecting member 25. In the past, it has been the practice to place connecting rods between the headstock and tailstock in a horizontal plane, rather than in a vertical plane passing through the headstock and tailstock axis, and in such prior structures, it has been necessary to utilize extremely or unduly large connecting members or rods for this purpose; With the present structure,.it has been found that where a particular size of connecting rod has been placed in a vertical plane under the presentV invention, the resistance to the normal distorting forces is substantially six times that which can be attained by the same size `of rods disposed in a horizontal plane and at the same meansthat are-to beeffective--between the rods and the various elements of the-tool maybe located in a conveniently accessible manner in each instance.V

' `Such'lo'cation of the tie rods 25 in a vertical plane also results `in a physical form in the major elements of the` tool-which facilitates the formation of these elements by conventional"processes"of casting. Thus, with re- `spect to the connecting bracket 45 of the headstock,

the clamping surfaces for cooperation without tie rods 25 may be readily and easily formed, while in the tailstock, the location of the tie Vrods enables rearwardly facing positioning surfaces to be utilized on the rear face of the wall structures of the tailstock, and this simplifies the casting problems, while at the same time enabling a highly attractive forward face to be afforded on the tailstock.

Further structural advantages of the present structure reside in the convenient convertibility of the tool from a lathe to a vertical drillpress.

It will be evident that the headstock 21 may be readily associated with spacing rods such as the rods 25 to connect the headstock with a tailstock in the manner herein described, but it should also be observed that by reason of the mounting flanges 3lF and mounting notches 31N, the present headstock may be supported or mounted independently of the spacing rods 25. This enables the present headstock to be mounted in widely spaced but aligned relationship with respect to a tailstock, or to be mounted independently of a-tailstock for use in sanding, buing, grinding and like operations.

Conclusion From the foregoing description, it will be apparent that the present invention materially simplifies the structure-*of multiple purpose machine tools, and enables the basic elements of such a tool to be utilized withgreater efficiency and in such a way as to materially reduce the manufacturing cost of such tools.` More specifically, it is to be noted that the present invention affords a multiple purpose tool wherein the basic structural elements are -so related that a high degree of strength and rigidity is attained through the use of a minimum of material.

Thus, while I have illustrated and described the preferred embodiment of my invention, it isrto be understood that this is capable of variation and mo-diication, and therefore do not wish to be limited to the precise details set forth but desire to avail myself of such changes and alterations as fall within the purview of the'following claims. Y

I claim:

Vl. In a multiple purpose machine tool of the character described, a headstock and a tail'stock each having a mounting base surface for mounting the same directly on a bench or the like, meanson said headstock defining a headstock spindle axis parallel-to and spaced a predetermined distance from the base surface of the headstock, means on said tailstock defining a tailstock center axis parallel to and spaced in the same predetermined distance from the base surface of said tailstock, a pair of laterally spaced parallel spacing rods extending through said headstock and said tailstock parallel to and equally spaced from both of said axes and ina plane that is perpendicular to said base surface and passes through said axes, said headstockand tailstock each having positioning surfaces thereon for engagement with such rods to locate the rods with respect to said headstock and tailstock, and releasable clamping means for clamping said rods against'such positioning surfaces, said headsotck includinga power motor having a shaft coupling on said spindle axis adaptable for receiving selectively a spindle or a drill bit clutch and said tailstock including a ram reciprocally mounted on its center `axis and having an end shaft coupling adapted for receiving either ay spindle or a drill press table, an outer face on said tailstock normal to its base surface, said tailstock being hinged to the bench at the outer end of said' base surface at the intersection thereof with said outer face, andclamping means for clamping either said base surface orsaid outer face to saidbench selectively afterswingingthe tool about said hinge to the corresponding positionon the bench, whereby ,the tool is adapted for a multiplicity of uses withoutsacricing'rigidity and simplicity. v

2.. Ina multiple purpose machine tool of the character described, a headstock and a tailstockeach .having a mounting surface affording a mounting base adapted to rest solidly and in an accurate relation on a bench or the like, means in said headstock aiording a headstock spindle parallel to and spaced a predetermined distance from said mounting surface thereof, means in said tailstock aifording a reciprocably movable tailstock ram shaft parallel to and spaced in the same predetelmined distance from said mounting surface of said tailstock, a pair of spacing rods disposed in a plane perpendicular to said Vsurfaces and passing through the axis of said headstock spindle and said tailstock shaft and said rods being extended through said headstock and tailstock in an adjustably clamped relationship thereto, said tailstoclt 'naving a second mounting surface located perpendicular to the first mentioned mounting surface of such tailstock and perpendicular to the axis of said tailstock shaft adapted to rest on such a bench or the like and locate said tailstock ram in a vertical position, and pivot trunnions formed in oppositely projecting relation on said tailstock at vsubstantially the intersection of said mounting surfaces of said tailstock.

3. In a tailstock structure for use in a multiple purpose tool, a pair of integrally formed plates positioned at right angles to each other and having oppositely projecting trunnions at the intersection of such plates, a

I`1 mounting sleeve disposed parallel to and spaced substantially from one of said plates and perpendicular Vto and integral at one of its ends with the otherof said plates, a front wall extending upwardly from the first mentioned of said plates and connected at its edges with both of said plates and with said sleeve, al partial end wall extended from said forward wall at the edge of such forward wall that is remote from said other plate to rigidly support said sleeve in parallel relationship to said first mentioned of said plates, and integral wall means rearwardly of said forward Wall and connected integrally with forward wall and with said iirst mentioned plate and affording rearwardly facing positioning surfaces against which a pair of tie rods may be clamped in predetermined relationship to said sleeve.

4. In a tailstock 4structure for use in a multiple purpose tool, first and second integrally formed plates positioned at right angles to each other and having oppositely projecting trunnions at the intersection of such plates, a mounting sleevel disposed parallel to and spaced substantially from said rst plate and perpendicular to and integral at one of its ends with said second plate, a front wall extending upwardly from Vsaid first plate and connected at its edges with both of said plates and with said sleeve, a partial end wall extended from said forward wall at the edge of such forward wall that is remote from said second plate to rigidly support said sleeve in parallel relationship to said iirst plate, integral means including a vertical rear wall disposed rearwardly of said forward wall and connected integrally with said forward wall and with said first plate and aifording rearwardly facing positioning surfaces against which a pair of tie rods may be clamped in predetermined relationship to said sleeve, a clamping bolt extended rearwardly through said rear wall, a clamp bar on said clamping bolt, a first elongated clamping nut on said clamping bolt for applying clamping forces to said clamp bar, a tailstock ram mounted in said sleeve for reciprocation therein, said sleeve having a longitudinal slot formed in its rear side, a clamping screw extended through said slot and into said ram to serve as a laterally projecting connection for transmitting longitudinal movements to said ram, said clamping bolt having a second clamping nut thereon, an actuating lever having a circular opening and a longitudinal slotted opening formed therein at spaced points, one of said openings embracing said rst elongated clamping nut, and the other of said openings embracing said ram clamping screw whereby said clamping screw may clamp said lever against said sleeve to hold said ram in any desired longitudinal position in said sleeve.

5. In a tailstock structure for use in a multiple purpose tool, a pair of integrally formed plates positioned atright angles to each other Yand having oppositely projecting trunnions at the intersection of such plates, a mounting sleeve disposed parallel to and spaced substantially from one of said plates and perpendicular to and integral at one of its ends with the other of said plates, a front wall extending upwardly from the first mentioned of said plates and connected at its edges with both of said plates and with said sleeve, a partial end wall extended rearwardly from said forward wall at the edge of such forward wall that is remote from said other plate to rigidly support said sleeve in parallel relationship to said iirst mentioned plate, integral wall means rearwardly of said forward wall and connected integrally with said forward Wall and with said first mentioned plate and aording rearwardly facing positioning surfaces against which a pair of tie rods may be clamped in predetermined relationship to said sleeve, a clamping bolt extended rearwardly through said integral wall, a clamp bar on said clamping bolt, an elongated clamping nut on said clamping bolt for applying clamping forces to said clamp bar, a tailstock ram mounted in said sleeve for reciprocation therein, said sleeve having a longitudinal slot formed in its rear side, a clamping screw extended through said slot and into said ram for transmitting longitudinal movements to said ram, an actuating lever pivoted on said last'mentioned clamping screw and having a longitudinal slot embracing said elongated clamping nut and a clamping shoulder on said ram-clamping screw for clamping said lever against said sleeve to hold said ram in any desired longitudinal position in said sleeve.

References Cited in the le of this patent UNITED STATES PATENTS 907,418 Sheldon Dec. 22, 1908 966,253 Smith Aug. 2, 1910 1,637,654 Perez Aug. 2, 1927 1,733,208 Schimmel Oct. 29, 1929 2,049,191 Bouget July 28, 1936 2,200,799 Miller May 14, 1940 2,226,029 Taylor Dec. 24, 1940 2,492,783 Chamberlain Dec. 27, 1949 2,623,269 Goldschmidt Dec. 30, 1952 FOREIGN PATENTS 620,276 Great Britain Mar. 22, 1949