US2135441A - Welded bitubular column - Google Patents

Description

Nov. 1, 1938. EL CHA ER 2,135,441

' WELDED BITUBULAR COLUMN I Filed Sept. '17, 1935 2 Sheets-She et 1 'INVENTOR R 14 45M BY M1) 5? 24220,

ATTORNEY kThe, invention relates to improvementsin columns for dri 1 for in such machines, the column is the fulcrum oramore in-length, upon which is mounted a translatable drillheadweighing upward of a 'near its base naturally introduces an error in heretoforeused were, with due regards to the .unit

' least amount of material consistent with the I rigidity and accuracydemanded in the completed {I'heprimary object of the present invention is proportion than a cast f struc't the column of steelplate and tubing, previously cut to the required shapes and sizes, and gwelded together at their joints. A steel column jaf'abricated welded column may be constructed- Ipen'sive patternsand loses due to defective castr Patented Nov. 1,1938

Y tool head, without flexing or yielding inany way.

transportation, and selling considerations rei ...{U I ED STATE PATENT OFFICE 2,135,441 F WELDED'BIIUBULAR COLUMN s Lawrence Lee Schauer WyOm I Ohio, assignor to The Cincinnati Bickford Tool CompanygCincinnati, Ohio, a corporation of Ohio Application September 17, 1935, Serial No; 40,910

vide a column which in its roughest condition requires but a. minimum amount of tooling to convert itinto a'finished product ready for installation in a machine tool organization. That end'is readily achieved in thisfabricated welded column construction for the reason that the steel plate and tubing selected for the column is of standard uniform thickness and sizes having relatively finished surfaces. The only machining necessary to the fabricated column being that around the bearings and the external Welds. As these portions to be machined are relatively few and small in number and. area the whole column maybel'constructed and installed in a machine tool in a fraction of the time and expense heretofore, involved in the construction of cast columns' Still another object of the invention is to provide a column amply reenforced at the critical points. In radial drill columnsthe crucial region wherein the largest portion of the bending stresses fall; is at the lower end thereof just above the base." With the cast columns heretofore used, manufacturers have endeavored to reenforce that area of the column by the use of ribs. etc., which fall far short of giving the strength and rigidity required. Problems arising in the foundry also presented insurmountable obstacles in the proper design of cast columns.

A fabricated Welded steel column, however, renderspossible a structure conceived along scientifically and mathematically sound lines and in which adequate provision'may be made for all thefactors of load, stresses, and safety.

In carrying out the objects of this invention it is proposed to weld a relatively short sleeve membert'o a base plate of the desired size, and to the top thereof Weld an annular inwardly extending flange or bearing ring. A relatively long length of steel tubing forms the column proper and to the, bottom of, which there is welded a transverse plate which closely fits the inside of the',lower sleeve, portion. By inserting the top endjof the column proper through the lower sleeve and the annular flange from the under side, a telescoping structure is formed by means of which the'column' may; within certain limits, be adjusted for height. After the proper height of column isobtained the two portions are welded together as an integral unit thereby forming a complete column; reenforced at its lower end by the bitubular construction. This design lends x supporttothe upright post at all sides of its ingsare entirely eliminated. a extreme lower end and also to a region substan- Afurther object of the invention is to protia'lly removed therefrom, thus elfectively resist- :9 Claims.

ling machines and more@ particu-- point of a massive radial arm frequently ten feet half-ton; In some constructions a sleeve memher is interposed betweenthe .arm and the column, whereas in other constructions no sleeve is used, However, in either type the column nec-" essarily-mustbe massively proportioned to carry the loadof the sleeve,..the iradial arm, and the Amy yielding of the column atthe lower regions alignment which ismagnified over and over again in the alignment of the tool spindle that is journaled in the head out on the arm.

To meet that condition the cast iron columns strength of cast iron, made exceedingly large and very heavy. And although manufacturing,

quired that the column be constructed with the fmachine-the huge cast ironcolumns of the machines represent still too large a. proportion of the.

cost of the'completed machine.

to render available a column having'the strength and rigidity necessary towithstand the severe bendingloads of the arm or thrusts of the tooling "operation; that may be easily constructed,relaffti'vely. light inweight and considerably smaller in iron column of equal :capacity. v In attaining. that object it is proposed to confabricated and welded, as herein proposed'isy as compared with a cast column of equalsize, at least 130% stronger. The net result being that considerably smaller than a cast column for the; j corresponding service, lighter in weight, and consequently more easily machined and handled.

Moreover; with a fabricated welded column, ex-

ing the forces tending to bend or deform the column at that critical region.

The present invention it will be observed also renders available a column free of internal longitudinal or radial ribs and webbings and in which there is ample free space available for the insertion of gears, shafting and such other mecha 'nisms as may be desired.

Other objects and advantages will be in part indicated in the following description and in part rendered apparent therefrom in connection with the annexed drawings. -n

To enable others skilled in the art so fully to apprehend the underlying features hereof that they may embody the same in the various ways contemplated by this invention, drawings depicting a preferred typical construction have been h annexed as a part of this disclosure and, in such drawings, like characters of reference denote cor mechanisms.

Fig. 4 is a horizontal sectional view along lines 4-4 of Fig. 2.

Referring more particularly to Fig. 1 of the drawings the typical machine therein illustrated comprises essentially a base member Ill; an upstanding post or column 'II secured thereto; a sleeve member I2 rotatable .upon the post; a radially extendingarm member I3 vertically adjustable upon the sleeve; anda tool head I4 translatable on the arm, toward or away from the L main supporting column.

Within the tool headfI4, a tool spindle I5 is journaled for rotation and translation, and also all the mechanism'necessary for driving the spindle at various speeds and for translating the head on the arm. In certain types of constructions the arm'also supports a main driving motor I6, while in other constructions the drive motor is located at the base of the column.

The main characteristic of a radial drill'is the V ability to drill tothe center ofvery large workpieces and 'to that end machines are made with anarmprojecting 1,0 to 12 feet from the column. This great overhang of the 'arm' sets up enormous bending stresses in the post I I at the region A indicated upon thejdrawings. The stresses are;

of course; more'severe when the headis at the extreme end of the arm than when the head is near the column. However, with either condition any bending or yielding of the column, whether caused by the load of the arm why the thrusts of the tooling operation, is greatly magnified and visually apparent at the drill spindle, resulting not only in inaccurate work but in'work being spoiled because of ,the tendency of the drill to break through the work near the end of the out due to the reflex spring in the column. a

' To overcome the disadvantages above indicated it is proposed to fabricate a column'of steel'p'late and tubing. Fig, 2 illustrates in section, a preferred method of constructing an eminently rigid column devoid of the flexing characteristics displayed in columns heretofore designed. The

present column is constructed of two main parts,

a base member 20 which is'bolted to the floor or to the main base of the machine, and an. upright cylindrical post 2i, a substantial portion of which telescopes within the outer shell portion 20.

The post 2 I' is preferably made of steel and is capped with a bearing and supporting plate 22,

' Welded thereto as indicated at 23. The center of the cap 22 is initially provided with an aperture 24 for receiving radial and thrust bearings for suspending the weight of the sleeve I2 and' all" parts carried thereby. The lower end of the hollow post or shell 2I has welded thereto a plate member 25 which extendsbeyond its periphery into engagement with the inner wall of the base portion 20.

A preferred form of a base for rigidly supporting the steel'post'ZI comprises a base-plate member 28 of a size sufficient to provide a peripheral bolting flange. The central section of the baseplate may be cut away and notched as at 29 to provide respectively'a space for enclosed meche anismand a gatefor the insertion of same.

'Extending upright from, and welded to the base-plate 28 is a cylindricalsleeve member 30 which completely encircles the post-plate 25 and.

provides an exterior clamping surface for the sleeve I2. Prior to welding the cylindrical member to the base-plate 28, a reenforcing annular band 3I is welded thereto as at 32 and 33. The weld 32 is thereafter ground smooth and the sleeve 3B'with its reenforcing band 3I welded to the base-plate 28 as at 34 and 35. r

I Thetopofjthe sleeve 33 has welded thereto, insideat 40 and outside at M, a stepped plate 36, the center of which is apertured at 31 to receive the steel inner tube 2| and to support same against lateral movement. j f

In assembling the post to the base, the post is inserted from the bottom through the opening.

31, adjusted vertically therein until the proper height .is obtained and welded at 38 and 39.

Preferably this height should be such that the lower post flange 25 comes. within the bounds of the: reenforcing band 3 I ,-s'o that the lateral thrusts reacting at the lower endof the post 25 are resisted not only by the sleeve 30 but also by the band3I. I I

.To complete the column a bearing band 42 is welded to the post 2| at the required height; and

a fcover member .43 welded to: the base-plate 28 and reenforcing band 3|, for covering the gateway to the open space within'the column;

is ground true and cooperates with complemental bearings means provided in the sleeve 12. The

50 In the machine illustrated the bearing band 42 sleeve is thereby guided against any lateral movement relative to the post 2I but may rotate there? on and be .clamped in any angularly adjusted position by the clamp' means indicated at 50.

Toiprve'nt the enormous weight of the overhang ing'arm from'impinging the sleeve tightly on the.

surface of the bearing member'42 and outer shell member $3.0, adjustable anti-friction rollers 44 journaled" in the bell portion of, the sleeve I2, are

provided. The rollers 44 ride against the peripheryof a bearing ring 5| .seatedin the step 45in the plate 36.

After assembling and'w'elding the plates and cylinders together as above explained the column ;is;=ready for finishing the surfaces of the bearing members :42 and sleeve clamping member 30.

lnasmuch as these parts already are provided with-relatively smooth and true peripheries, the expense involved in'bri'nging them to the precise dimension required is reduced to a minimum. a

, welded steel column is rendered available having a From the foregoing itLwill be "perceived thata I all the 'advantages'oi a cast column plus the additional advantages of being smaller in size, more sturdy and rigid in the vital regions, and-easily and quicklyconstructed; -All-vertioalthrusts ion The rectangular'section defined by the walls of these plates and the side walls of the cylinders2 l; g and 30 affording afclosed rectangular annulus 10 eminently suited 'to' resist iany vertical or lateral deflection underthelever action of the armincident to its weight'or occasioned by the tooling -20 can," by applyingcurrent knowledge, readily adapt it for various utilizations by retaining oneor more of the-features that, from thestandpoint of the prior art; fairly constitute essentialcharacteristics of either the generic or'specific aspects of 25 this invention and, therefore, such adaptations should be, andare intended to be, comprehended [within the "meaning and range ofequivalency of "the following claims;--'

a 7 Having thus revealed this invention, I claim as 1 30 new andfldesire to secure the following combina tions'and elements,- or equivalents thereof, by Letters- Patent of h the United States: 1-. A radial drill combining a base, a horizon 1 *ftally di spo'sed'arm member extending in parallel '35j spaced relation withsaidbaseya tool head,-having a tool spindle journaled therein, translatable on the arm; and a verticallyarranged welded steel column connected with one of said armand withsaid base for supportingjsaid arm and for '40 maintaining same in said parallel spaced relation under the reactionary forces of'the tooling operation and of gravity, comprising a relatively long inner steel shell and'a relatively, short outer steel 'shell arranged in spaced relation and par- 45 tially-telescoped, the lower end of said outer shell extending beyond the lower end of said inner shell, and apair of spaced flange members arranged transverse to-the axis of said shells for connecting said shells together as an integral unit 5 and for transmitting to said outer shell the vertically and laterally acting forces of the inner shell V incident to the weight and lever action of the said arm acting thereon. I I 7 2. A radial drill combining a horizontally extending arm member a tool head translatable on the arm; a'tool spindle journaled in said head; 'an' upright column member for supporting one end of said arm and for maintaining said arm in said horizontal relation under the reactionary 60 forces of gravity and of the tooling operation, comprising an upright steel post member, a supn porting base member for said post overlappingthe lower'portions of said post and. extending beyond theend' thereof, said base member having an 65 aperture provided; therein "for receiving a substantial portion of the lower end of said post member," and means arranged perpendicular to i J the'axis of said post integrally connectin'g the extreme lower end of said post member to an 70 intermediate section of said base member and the top of said baseme'mber to an intermediate secv ,i tionjof said post. 7 s s r 3. Aradial drill combining a base member; a

V fabricated 1 tubular .column' member uprising '75 thereirom an arm member supported by and extending radially from said tubular column; said column comprising a smooth walled steel tube having at its lower end a concentric peripherally I 3 spaced sleeve member, said sleeve member ex- 5' the post- 2 areftransmitted'to the-base at two regions, namely through the platesziand 36.

tending beyond the end of said tube; a pair of spaced flange members integrally Welded to said sleeve, one of the flanges being adjacent the extreme lower end of said steel tube and the other of said flanges being adjacent the top of said sleeve and engaging the outer periphery of an intermediate section of said tube; and means uniting said flanges, steel tube and sleeve members together as an integral unit aifording a bi-tubular reenforced column construction, having at least one annular and completely closed cell, resisting bending strains occurring at the lower portions thereof incident to the weight and lever action of said arm.

4. A radial drill combining a base; an arm member spaced therefrom and in parallel relation therewith; a column member for rigidlysupporting one end of said arm, comprising a hollow steel tubular member,'a concentrically arranged spaced sleeve member adjacent one end of said steel tubular member andextending beyond the end thereof, a first transverse flange member connecting the end of said tubular member with the inner periphery of said sleeve member intermediate its ends, a second transverse flange member connecting the upper end of said sleeve member with the outer periphery of an intermediate section of said tubular'member, said transverse flanges being spaced apart from one another forming a closed annular cell between said sleeve and tubular member, for supporting the end and intermediate regions of said tubular member against vertical and lateral movement;

andmeans encircling said sleeve member at a region coincident with the plane of one said transverse connecting flanges for reenforcing said sleeve against the laterally acting strains transmitted through the said flange.

' 5. A radial drill combining a base member; a fabricated tubular column member uprising therefrom; an arm member supported by and projecting radially from said tubular column; said column comprising a smooth walled steel tube, a concentrically arranged open ended sleeve member surrounding the lower portion of said tube and extending beyond the end thereof, an annular flange engaging the upper end periphery of said sleeve and the periphery of said tube at a point intermediate its ends, a second annular flange member engaging the lower end of said tube and the adjacent inner wall of the said sleeve member, said flanges, steel tube and sleeve members being welded together as to form an integral unit having a closed rectangular annular space between said flanges, tube, and sleeve, and adapted to withstand the vertical lateral strains incident to the weight and lever action of the said projecting arm, and a metal ring member encircling the lower portion of said sleeve and welded thereto for additionally reenforcing same.

6. A radial drill combining a base, an arm member extending in parallel spaced relation with said base; a tool head, having a tool spindle journaled therein, translatable on the arm; and a column connected with one end of said arm and with said base for supporting said arm and tool head and for maintaining said arm in said parallel spaced relation under the reactionary forces of the tooling operation and of gravity, comprising a relatively long inner steel shell and a relatively short outer shell arranged concen- 4 trically and in "spaced -relation,"and a pairot vertically spaced continuous flange members ar-;

ranged transverse to the axis of said shells, said flange members and said shells being weldedtor gether as anintegral unit with the lower end of said inner shell spaced from said base and for transmitting to 'said outer shell the vertically acting forces of the inner shell induced by the weight of said arm, said concentric shells and spaced flanges forming a closed rectangular anon the arm;.a tool spindle journaled in said 7 head; a column member for supporting one end of said arm and for maintaining said arm in said horizontal relation under the reactionary forces of gravity and of the tooling operation, comprising an upright steel post member connected with one end of said arm, a supporting base member for said post, said base member having an aperture provided therein, for receiving a substantial portion of the lower end of said post member, and having flange means arranged in spaced relation in parallel planes perpendicular to the axis of said post and'adapted to engage the extreme lower end and an intermediate section of said post, said flanges and post members being welded integrally together thereby affording a rigid bitubular column member reenforcedfat its lower end against lateral strains'incident to the lever action of said arm.

8. A radial drill combining a base member; a

fabricated tubular column member uprising therefrom constituted 'of a plurality of concentrically arranged tubularpportions welded together, the outer portion extending only; 'part- I way: to the top of theinner portion and exteriorly providing a clamping surface and interiorly connected to the :inner portion by; a plurality of horizontally'disposed flanges, one of said flanges being adjacent the lowerend of the innerpormember extending radially from said sleeve and arranged for vertical; movementthereon, said welded tubular portions and flanges affording a rigid column member reenforced against vertical weight and lever action of said arm; ,9. The method of fabricating a steel column from steel plate and tubing for a radial drilling machine which consists in welding a circular flangeplate member to the end of a length of smaller diametered steel tubing, welding an in- Wardly'projecting annular flange plate memberto one end of a shorter length-of steel tubing which has an ,inside diameter approximately equal to the diameter of the flange plate welded to the first mentioned steel tube, placing said two .1. and lateral thrustsof said sleeve'incident to the steel tubes in telescoped relation with the flanged V end of the first mentioned tube inside-of'the second steel tube and spaced from the inwardly projecting flanged end thereof, and with the inner edge of the inwardly projecting flange adjacent the outer periphery of the flrst mentioned steel tube and then welding the adjacent portions of both flanges and'steel tubes thereby to provide a bi-tubular steelcolumn reenforced by the two transverse spaced flanges.

LAWRENCE- LEn SCHAUER.

a I CERTIFICATE OF CORRECTION. Patent No.- 2,155,1 E1. November 1, 19

- LAWRENCE LEE SCHAUER. Y It .ishereb y oertified that error appears in the printed. specification of the above numbered patent requiring correction as follows: Page 5 first column, line' 58, claim 1, after the word "one" insert end; and that the said Letters Patent should be read with this correction therein that the same may conform to the 'reeord of the case in the Patent Office. I

signed and sealed 'this 6th day of December, A. D. 19 8.v

v a Y Henry Van Arsdale (Seal) Acting Commissioner of Patents.

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