US1374581A - Radial drill - Google Patents

Description

D. c. KLAUSMEYER.

lRADIAL DRILL.

APPLICATION 'FILED AUG8, 1919.

v Patented Apr. 12,1921..

2 SHEETS-SHEET l- INVENTOR wlTNl-:ssEs:

' x e. im.

UNITED STATES PTENT oFFicE.

DAVID C. KLAUSMEYER, F CINCINNATI, OHIO, ASSIGNOR T0 THE CINCINNATI BICKFORD TOOL COMPANY, OF OAKLEY, CINCINNATI, OHIO, A CORPORA- TION 0F OHIO.

RADIAL DRILL.v

lSpecification of Letters Patent. Patented pl'. 12,- 1921"..

. Application led August 8, 1919. Serial No. 316,048.

T o all whom t ma, concern: K Be it known that ,DAVID C. KLAUSMEYER,

a citizen of the United States, and residing at Oakley, Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and Improved Radial Drill, of which the following specification is a full disclosure. t

This invention relates to power-driven drilling-machines and it deals lmore especially with the type known as radial drills which involve the use of a column providing forthe elevation and depression of a drill-supporting arm radiating horizontally therefrom and, usually also, providing for a swing of said arm in. the horizontal plane; thereby aording a universal adjustment for the drill.

In such machines, by reason of the weight and length of the arm and of the weight of the head or the thrust Aof the drill, the

column is subjected to severe bending-loads and it is usually formed of two members, z'. e., the primary member, in the nature of an upstanding post or trunk, and a secondary member, usually in the nature of 'a sleeve or other mechanical element adaptedto serve as a pivotally acting element to provide for the swing of the radial arm. n

.Mechanical considerations demand that this upright support, or column, post, or trunk,'as it may be termed, shall provide the requisite degree of rigidity capable of adequately resisting the bending-stresses t'o which it may -be subjected, and manufacturing, transporting and selling considerations, require it to be constructed of the least amount of material consistent with the realization of sufiicient stiffness. In an eort to reconcile these conditions, manufacturers have resorted toa simple tubular or hollow Iformation, occasionally augmented with rudimentary ridges. l

The primary obj ect of this invention is to advance the development of this constructionv by more perfectly reconciling4 the above-named considerations and thereby rendering available a post eminently suitable for enteringinto a radial-drill organization as an element better cordinating with the other `elements of the combination. Other objects will be in part obvious from the annexed drawings and in part indie. ed

in connection therewith by the following analysis of the invention.

This invention accordingly consists in the features vof construction, combination of parts and in the unique relations of the members and in the relative proportioning and disposition thereof; all as more coinpletely outlined-herein.

To enable others skilled in the art so fully the numerous modifications in structure' and relation contemplated by this invention,

drawings depicting a preferred form have.

been. annexed as a part of this disclosure, and insuch drawings, like characters of reference denote corresponding parts throughout all the views, of which Y Figure l is a sectional elevation of a rato lcomprehend the underlying features l thereof that they ymay embody the same by.

dial-drill embodying this invention. Fig. 2

is a horizontal section through line 2-2 of Fig: 1. Fig. 3 is la fragmentary vertical section through line 3+3 of Fig. 1. Fig. 4 is an elevation of the clamping device.

This invention is shown embodied-iny a radial-drill of the species in which the elevating screw 'is lpropelled through the agency of a power-driven shaft arranged coaxially with -the stationary,vupright post or trunk, although it will be understood that theY invention is applicable to other types presenting somewhat different details of construction. In the type herein illustrated,

. the post or trunk is indicated by A and it Aassumes the form of a casting bolted or otherwise mounted in unitary relationwith a base indicated by Bin the form .of a suitable bolt receiving lugs located at its sides and i its rear; In this embodiment, the base portion provides apertured bosses 3 and 4 within which is journaled a driving shaft C ioo bearing a beveled gear 5 adapted'to intermesh with the complementary beveled gear 6 secured to an' upright driving .shaft D arranged, in this instance, so as to extend coaxially through the stationary post and ten minating exteriorly at its upper end in pro.- elling relation with suitable change gears (which, in turn, are effective to rotate an elevating screw F located externally of the column and passing through asuitable nut G secured to the arm H so as to enable the latter, together with the drill head I, to be elevated or depressed by the above mentioned power driven instrumentality.

At its upper end, the post lA is provided with an annular seat 7 adapted to receive a bearing block 8 mounted concentrically and provided with an annular seat 9 adapted to receive an annular ball-bearing 10 and also provided with a seat 11 adapted to support a thrust ball-bearing 12. Enveloping the above mentioned post, is a sleeve J in the nature of a tube; said sleeve being secured at its upper end to a cap K which is provided with a hub 13 adapted to bear against the thrust bearing`12, whereby the sleeve, together with the parts carried thereby may be hung from its upper end and have its weight in the whole or in part taken up by the aforesaid thrust bearing 12. This sleeve is provided with an internal annular rib 14 concentricallylreceiving the side ball-bear# ing 10 so that at its upper end, said sleeve will be free to rotate and to be, at the same time, maintained truly concentric with the axis of the post. Adjacent this lower end, said sleeve is also conformed to rotatably bear against the post and, to that end, it is provided with an am le annular bearing surface 1 5 preferably flbrmed in the nature of a slight,annulvar ridge adapted to uni-.

formly contactjwitha corresponding surface 16 provided by the post. .These bearingv por-` tion 15 and`16 are truly cylindrical so as to permit of the .slight axial adjustments in the position of the sleeve incidental to the assembly of the elements in the factory or subsequently In order that the above mentioned sleeve may v be securely clamped against rotation; during the drilling loperation,y its lower portion isjslightly enlarged to telescope *with a brake surface 17 provided by the lower portion of thepost. The sleeve is split horizontally at 18 partially around its periphery and the portion thereby freed is split vertically at 19; thereby providing suicient resiliency or flexibility to admit of clamping. The clamp is, in this instance, formed of a draw-bolt 20 having its one end adjustably secured to a-lug 21 by means of suitable nuts and having its other end provided with a perforated hub 22 apertured to receive an eccentric forming a', part of a stub shaft 23 journaled in lugs 24 and operated by a suitable handle 25, as will be understood.

.The elevating screw F, above mentioned, is at its upper and lower ends journaled in suitable bosses provided by the cap K and the lower portion of the sleeve, so as to be carried by the sleeve and spaced a suficient distance therefrom so as to pass through the feed nut G provided by the arm H. The latter is provided with a portion 26 circumscribing the sleeves and internally having, annular bearing surfaces 27 and 28 accurately fitting aroundthe sleeve J. The periphery 29 of the sleeve is ground to true cylindrical form so that the arm may freely slide thereon and be given any desiredposition through the.

instrumentality of the feed screw F.

An analysis ofthe foregoing will show that the stationary element or post A is subjected to very considerable bending strains in 'various directions depending upon the different positions both horizontally and vertically of the arm H. Great difficulty has been experienced in so devising th structure of this post that thel aforesaid strains will be effectively and invariably resisted. It will be at once apparent that the least yield will produce a corresponding displacement of the drill point and will correspondingly impair the precision of operation of the machine. Where a large sized drill is employed and fed rapidly into the work, as in the case of heavy duty drilling, it is obvious that extremely heavyjbending strains will be imposed upon the post. In accordance with this invention, this post is accordingly given a .peculiar design which has been found to satisfy all requirements.

This post is vbi-tubular in structure with 'spaced vanes connecting the nested tubes.

Thus, an inner tubevA is located concentrically within the outer shell of the post and may extend froml near one end of the outer ably continuously as shown. ,Incase 1t is used 'for housinga driving shaft, it lmay terminate at about the point 30, somewhat above the shaft C, and may berecessed to retain a bushing 31 for said shaft. It is-in this base region that the greatest strains occur, for here the post is subjected toits maximum bending-stresses-bythe arm, and. f here -it receives the clamping-strains that lock the sleeve against rotation, and .here it also carries pressures resulting from the power-transmitting elements. But, by reason of the integrally-vaned bi-tubular formation of this base-region, these various strains are taken-up or absorbed effectively -shell to near the other end thereof, preferv lll so that a high ultimate accuracy and rigidity is achieved without employing an exce quantity of cast-iron. Adjacent the upper end of the post, a portion of the inner tube A may terminate flush with the shoulder of the annular seat 7 or otherwise be adapted to assist in supporting the block 8. In thickness, the wall of the inner tube may substantially approximate that of the outer shell.

The vanes a, a', a? etc., are preferably cast to integrally connect the inner and outer tubes and will preferably be symmetrically arranged, as shown, so as to leave similar cells or spaces b, b', Z22, etc., arranged in equispaced relation. These spaces .represent a very considerable saving of metal Without materially sacrificing strength and stiffness. The vanes are shown to lie in radial planes but they may extend in helical planes, and preferably they extend continuously between the extremities of the inner tube and may then divert at an angle from the lower end of the inner tube to meet the lower edge of the outer tube, as indicated by e and e; being cut away where necessary to make provision for the shaft C, and the gears 5 and 6. The wall thickness of the several vanes may be substantially equal to that of the tubes.

The advantageous rigidity of this structure will be recognized from the foregoing expos. It will also be appreciated that the inherent simplicity of this design admits of its being cast as an integral structure without any great difficulty being experienced with respect to the molds or 1n the formation', placing, and subsequent removal of the re uisite cores.

Vithout further elaboration, the foregoing will so fully reveal the gist ofthis invention that others can by applying current knowledge readily adapt it for various applications without omitting certain features that, from the standpoint of the prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention, and therefore such adaptations should/ and are intended to be comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, I claim as new and desire to secure the following combinations of steps and elements, or equivalents thereof by Letters Patent of the United States. d

1. A radial drill combining a base; an arm extending horizontally therewith; an upright post carried by said base and arranged to support one end of said arm, `said post being formed of nested tubular portions integrally connected by .radial vanes; and means for effecting a relative adjustment between said arm and said base.

2. A radial drill combining a base; a bitubular post f upstanding therefrom and formed of concentrically spaced tubular portions integrally connected by intervening vanes; an arm supported at one end by said post; and means for `vertically moving said arm.

3. A radial drill combining a base; a tubular post upstanding therefrom constituted of a plurality of co-axial tubular portions spaced peripherally apart, the outer portion witnesses.

extending continuously from top to bottom and having its lower end enlarged and integrally connected by a plurality of continuous intervening vanes with the; adjacent inner portion to form a base reinforced against bending strains; an arm extending radially to the axis of said post; and means for effecting a relative vertical adjustment between `said base and said arm. 4. A radial drill combining a base; a bitubular post consisting of an outer and an inner tubular shell, said shells being continuous. and arranged co-axially, and being integrally connected by a plurality of vanes; an arm extending radially to the common axis of said shells;,and means for elevating said arm.

5. A radial drill combining a base; an upright post carried by said base and arranged to support one end of said arm, said post being formed of nested tubular portions integrally connected by radial vanes; a tubular sleeve rotatably carried by said post; an arm extending horizontally therewith; and means for elevatingand lowering said arm.

6. A radial drill combining a base; a bitubular post upstanding therefrom and formed of concentrically spaced tubular portions integrally connected by intervening vanes; a sleeve rotatably carried by said post; an arm radiating from said sleeve; and means'for vertically moving said arm.

7 A radial drill combining a base; a bitubular post upstanding therefrom. constituted of a plurality of co-axially arranged tubular portions, the outer portion extending continuously from top to bottom and having an enlarged lower end exteriorly providing a clamping surface interiorly integrally connected by a plurality of continuous intervening vanes; a sleeve enveloping said post and having its lower end adapted to be constricted, into a clamping relation with said clamping-surface; an arm extending radially from said sleeve; and means for vertically moving said arm.

8. A radial drill combining a base; a bitubular post consisting of an outer and an inner tubular shell, said shells being con-l tinuous and arranged co-axially, and being integrally connected by a plurality of vanes; an elongated sleeve enveloping said post to rotate about the axis thereof; an arm extending radially to the common axis of said shells; and means for elevating said arm.

In witness whereof, I hereunto subscribe my name, as attested by the two subscribing DAVID C. KLAUSMEYER. Witnesses SLETE,

AUG. H. TUEOHTER.

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