US2511884A - Adjustable toolholder - Google Patents

Description

June 20, 1950 A. THOMAS 2,511,884

ADJUSTABLE TOOLHOLDER Filed Aug. 2a, 1946 s Sheets-Sheet 1 .INVENTOR. J fllbert Thomas ATTO RN EYS June 20, 1950 A. THOMAS ADJUSTABLE TOOLHOLDER s Sheets-Sheet 2 Filed Aug. 28, 1946 INVENTOR. fllbeI-t Th omas ATTORNEYS June 20, 1950 THOMAS 2,511,884

ADJUSTABLE TOOLHOLDER Filed Aug. 28, 1946 3 Sheets-Sheet 3 r im Em fllberjiii- 759F105 v [ATTORNEYS Patented June 20, 1950 UNITED STATES PATENT OFFICE i 2,511,884 ADJUSTABLE TOOLHOLDER Albert Thomas, Munhall, Pa.

Application August 28, 1946, Serial N 0. 693,417

14 Claims.

This invention relates to adjustable tool holders and has for its general aim and purpose to avoid the complications of prior devices of this kind and providesimply constructed and easily operable means for accurately adjusting and rigidly retaining a cutting or boring tool in a predetermined radial setting relative to the axis of a machine spindle or chuck and the work.

One of the important objects of theinvention resides in provision of means'for adjusting the tool holding member radially of the axis of a driving member together with means connecting said members for relative radial movement and directly coacting with said tool holding member to prevent rotary movement of the latter during adjustment thereof and maintain a constant angular relation of the tool to the work in all adjusted positions thereof.

A more particular object of the invention is to provide a key mounted in the driving member and having means directly transmitting driving torque to the tool holding member independently of the adjusting means.

Another object is to provide novel adjusting means embodying a split expansible bushing rotatable in a socketed end of the driving member and having a tapered eccentric bore receiving a similarly tapered part of the tool holding member, together with means for adjusting said bushing and frictionally locking the same to said member and the wall of the socket to retain the tool holding member in eccentrically adjusted relation to the driving member.

A further object of the invention is to provide a novel cooperative assembly of the driving and tool holding members with the adjusting bushing so that the adjustment of the tool holder with respect tothe driving member will not be disturbed or changed by torque stresses in the operation thereof.

It is an additionalobject to provide eccentric adjusting means for the tool holder which is so constructed that maximum efficiency is attained and certain inaccuracies characteristic of tool holders of this type as heretofore suggested are substantially eliminated.

Another important object of the invention is to obtain complete rigidity between the driving and tool holding members and in one of its embodiments the eccentric locking bushing is provided with relatively expansible and contractable end portions one of which is expanded to frictionally grip one of said members while the other end portion is contracted to frictionally ment of said bushing.

A still further object resides in the provision of means adjustably mounted in the driving member and coacting with means on the tool holding member to prevent rotary movement of the latter and simultaneously axially move said member and the adjusting bushing therefor into rigidly locked relation with said driving member.

The invention also contemplates an adjustable tool holder as above characterized comprising a minimum number of durably constructed elements, in which all cylindrical surfaces of the driving and tool holding members are concentric with their respective axes, to simplify machining operations and realize a desirable economy in manufacturing costs.

With the above and other subordinate objects in view, the invention comprises the novel tool holder construction and adjusting means therefor in the composite assembly to be hereinafter more full described, illustrated in the accompanying drawings and subsequently incorporated in the subjoined claims.

In the drawings wherein I have illustrated several simple and practical embodiments of the present invention, and in which similar reference characters designate corresponding parts throughout the several views:

Figure 1 is a side elevation, partly in section, illustrating one practical embodiment of my improved tool holder;

Figure 2 is a top plan view, certain parts being shown in horizontal section, substantially as indicated by the line 22 in Figure 1;

Figure 3 is an end elevation of the tool holding member;

Figure 4 is a side elevation of the adjusting bushing;

Figure 5 is an end elevation thereof;

Figure 6 is a similar view of the opposite end of the bushing;

Figure 7 is a detail sectional view of the adjustable cam means for moving the tool holding member and bushing to'final set position with respect to the'driving member; v

Figure 8 is a side elevation illustrating a simplifled embodiment of the invention;

Figure 9 is a top plan view thereof, partly in horizontal section, substantially as indicated by the line 9-9 in Figure 8;

Figure 10 is an end elevation of the adjusting bushing shown in Figure 8;

Figure 11 is a side elevation of the adjusting bushing;

I Figure 12 is a detail elevation of the key for the tool holding member; and

Figures 13 and 14 are diagrammatic views illustrating the adjusting action of the eccentric bushing when the machine spindle and driving member are in and out of axial alignment respectively.

Referring in further detail to the drawings and for the present more particularly to Figures 1 to '7 thereof, and 22 generally designate the tool holding member and the driving or coupling member respectively. The latter comprises a shank 24 adapted to be secured to 1 a machine spindle or mounted in a chuck in the usual manner. One end of the shank 24 is provided with a coaxial cylindrical coupling head 26 of enlarged diameter, preferably integral with the shank. This head is formed with a bore in axial alignment with the shank 24, having a section 28 of maximum diameter connected with a relatively narrow outer end section of the bore of reduced diameter to form the annular land 30. The other end of bore section 28 is connected with an axially spaced section 32 of relatively small diameter by the inwardly sloping or inclined annular wall 34. All cylindrical surfaces of this bore are substantially concentric with the outer cylindrical surface of the coupling head 26. v

Adjacent to the juncture of head 26 with the shank 24 said head is provided with a cylindrical opening 36 having its axis normal'to the axis of shank 24 and in the plane thereof. The outer side portion of this opening intersects the inner small diameter section 32 of the bore in the coupling head 26 for a purpose which will be presently explained.

The tool holding member 20 comprises an elongated cylindrical body portion 38 of uniform diameter, provided at one end and at one side of its axis with an obliquely inclined or beveled face 40. A set screw is 'provided for adj'ustably mounting a tool bit 42 in the body 38 with its axis disposed parallelto the beveled face40.

The other end of the body portion 38 of-member 20 is formed with a frusto-conicai portion 44 connected at its smaller end with an axially spaced annular endsection 46 by a reduced section 48 of uniform diameter. Aprojecting lug or nose 56 extends diametrically across the end face of the section 46. This lug is of general wedge-shaped form and has opposite faces 52 beveled or inwardly inclined from the end face of the lug toward the axis of member 28. The end face of the lug' is provided with a groove 54 intersecting the inclined faces 52. p v

The adjusting bushing for the tool holding member 26 comprises a sleeve 56 of redetermined length and. external diameter to. be rotatively received within the coupling head 26. This sleeve atoneuof its ends is formedwlth a flange 58 concentric with the external surface of the sleeve and preferably knurled or milled as at 60 for facilitating the quick andeasy rotation of the sleevewithi'nthe coupling head. The

stance four of these slots are shown, spaced 90 apart, and they extend through the flange 58, terminating at their inner ends substantially at mid-length of the sleeve.

At its opposite end the sleeve 56 is formed with an external inwardly tapering or inclined annular surface 10 having an inclination substantially equal to that of the bore section 34 of the coupling head 26'. This end of the sleeve is also split by the narrow longitudinal slots 12 disposed in planes intermediate of the slots 68 and also extending from the free end face of the sleeve inwardly to substantially mid-length thereof. By reason of this split construction of the bushing sleeve opposite end portions thereof between the slots 68 and [2 respectively, may relatively expand and contract in re sponse to radial pressures in the final assembly of the members 28 and 22 in rigidly coupled relation with each other in the mariner hereinafter described.

Complementary tubular camming members 14 and 16 respectively are adapted to be slidingly fitted in the'opposite ends of opening 36 in the coupling member 26. The opposed ends of these members are cut away or recessed asat 18, for a depth substantially equal-to the radius thereof, one Wall 38 of each recess being disposed at an oblique angle to the axis of the respective members, which substantially corresponds to the angle of one of the inclined faces 52 on the lug or nose 50' with respect to the axis of member 20. Cam member 74 is internally threaded to receive the threaded end of an adjusting screw 82 extending through the other cam member 16. The latter member at its outer end is formed with a countersink 84 providing a seat for the tapered head 35 of the adjusting screw. The screw head is provided with an axial recess 88 for the application thereto of a suitable wrench.

Upon the outer surface of the coupling head 26 at its open end, a scale Sill is engraved or otherwise delineated in predetermined or selected terms of measurement indicative of the different diametrical settings of the tool bit 42 and is readable with respect to the index line 92 on the periphery of the bushing flange 58.

In the initial assembly of the above described parts, the eccentric'ally bored bushing 56 is first applied over the end of the tool holding member 26 and the two parts then inserted into the coupling head 26, with the flared end 64 of bushing bore 62 in contact with the frusto-conical section M of member 20 and the'external tapered surface 10 of the bushing in contact with bore seccam surfaces 80 of said members and the inclined faces 52 of the terminal lug 5 0 on member 20, the

groove 54 thereof embracing the adjusting screw.

bore 62 of the sleeve eccentrically' drilled therethrough with respect to its outer surface and flange 58, andat the latterend of the sleeve is outwardly flared or of' progressiv'ely increasing diameter to provide an annular surface 64 of substantially the same width and inclination as the peripheral surface of the section 44 of the tool holding member 20. i

Preferably the sleeve at its juncture with flange 58 is provided with an-vexternal circumferential groove 66 and thislend-of the sleeve is split-by the narrow longitudinal slots 68. In the present in- After first adjusting the tool bit 42 in the holder for a trail cut the flange 58 is grasped and bushing 56 rotated between the wall'of coupling head 26 and the tool holding member 20 until index line 92 registers with one of the graduations of scale 90 denoting a predetermined diameter of the bore or other surface to be out upon the work by the tool bit 42. Since bore 62 of the bushing is in eccentric relation to the axis of coupling member 22, the member 20 and tool bit 42 will thus be radially displaced inwardly or outwardly relative to said axis and the axis of the work piece. As shown by the scale reading in Figure 1 the tool 42 has been adjusted for cutting a maximum diameter bore and it will be evident from reference to Figure 5, that by rotating the bushing through 180 in a clockwise direction from the positio'nshown in Figure 1,

20 against rotation with or independently of the bushing relative to the coupling member 20. Such rotation would introduce an additional lateral displacement component of the tool 42 relative to the machine spindle so that the actual setting thereof would not accurately reflect the bore diameter reading on scale 90. This inaccuracy of the tool setting would be seriously multiplied when the axis of the coupling and driving member 22 is not in exact alignment with the axis of the machine spindle, as will be later explained in connection with Figures 13 and 14 of the drawings. It will also be observed that in the adjustment of member 20 with respect to couplin head 26 the members 14 and I6 with adjusting screw 82 will be axially moved as a unit in opening 36. Groove 54 is of suflicient depth to permit displacement of nose or lug 50 diametrically of the screw 82 in the displacement of tool holder 38 by the bushing 56.

After the adjustment of bushing 56 to position tool 42 at the desired borev diameter as above explained, screw 82 is then. adjusted to move the members I4 and I6 inwardly, toward each other. The cam surfaces 80 of these members, coacting with the inclined surfaces 52 on lug 56, impart a unitary inward axial movement to the tool holding member 20 and bushing 56 relative to coupling head 26 It will thus be evident that the pressure engagement of tapered surface on the bushing with inclined wall surface 34 of the coupling head causes an inward radial contracting pressure upon the parts of the inner end of the bushing between the spaced slots I2, while the part, of tool holding member coacts With theflaring or inclined end surface 64 of the bushing bore 62 to outwardly expand the other end sections of the bushing between the spaced slots 58. Thus the latter end sections of the bushing are radially expanded into tight binding contact with the annular land on coupling head 26,. and substantially at the same timegthe i ner-,- end sections of the bushing are radially'contracted into tight binding engagement with the annular part 46. upon the end of member 20. In this manner a rigid frictional coupling-betweenthe driving member 22, bushing 56 and tool holding member 20 is produced, which efiectivelyzprecludes casual rotation of the bushing relative .to members 20 and 22 from its adjusted position, which might result from vibration or other causes. It will also be noted that this frictional coupling will not be disturbed by driving torque stresses since the driving torque is transmitted to the tool holding member 20 principally through the members "I4 and 16, which rigidly lock the member '20 against rotation in coupling head 26, independentlyof the bushing 56. u a

Fromthe above it willabe seen that this embodiment of my invention provides an eccentric adjusting bushing for the tool holding member of novel construction, whereby the tool may be quickly and accurately adjusted to a predetermined set position relative to the axes of the driving member and spindle, and that said bushing is frictionally coupled at axially spaced points with the driving and tool holding members. The two part torque transmitting key I4, I6 also serves a further purpose as the means for effecting the frictionally coupled relation between the bushing and the driving and tool holding members.

In Figures 8 to 12 of the drawings, I have shown a somewhat simplified embodiment of the invention. In this construction, the cylindrical shank or body of tool holding member 94 has a cylindrical conical end portion 96 progressively increasing in diameter from a threaded section 98 of said member to the end face I00 of part 96 which is provided with a diametrically extending groove I02 therein having parallel opposite side walls and an arcuate base I04.

The other end of the member 94 is provided witha diagonal opening I06 intersecting the axis of said member at an angle of substantially 45. This opening adjustably receives the tool bit I09 which is rigidly fixed therein in its adjusted position by means of the set screw IIO;

In this construction the coupling head II2 on the end of driving member II 4 is comparatively short and the inner and outer surfaces of its cylindrical wall are of uniform diameter throughout their length and parallel with the axis of said driving member. At its inner end, the coupling head is provided with the diametrically extending opening H6 to slidingly receive a one-piece torque transmitting key or pin H8. This pin is of general E-shape form, having the longitudinally spaced recesses I20 in one side thereof forming a central semi-cylindrical lug I22 which is adapted to be snugly received between the parallel side walls of the recess I02 in the conical end 96 of tool holding member 94. It will be noted that the base wall of the recess I02 is of considerably greater radius than the lug I22 and permits the member 94 to move radially in the coupling head relative to the key lug I22.

The adjusting bushing I24 for the tool hold ing member 94 has an eccentric bore I26 which progressively increases in diameter from the outer face ,of the end flange I28 on the bushing to the opposite end thereof, the taper or inclina" tion of said bore being such as to have normal snug fitting contact'upon the cylindrical surface of the'jconical end 96' of member'94 throughout its length. As seen most clearly in Figure 11 of the drawings, the wall of the bushing and the flange I28 thereof are longitudinally split at a single point by the slot I30 extending throughout the length thereof. After the bushing has been applied to the conical end 96 of member 94, a nut l32-is engaged with the threaded section198 of said member for hearing contact againstthe face of ,the bushing flange I28. As herein shown this nut is provided with spaced radial recesses I34 to receive the spaced parts of a conventional spanner wrench.

In assembling the above described parts, in this casethe key pin H8 is first inserted in the opening I I6 of the couplinghead. The conical end 96 of member 94 and the bushing sleeve are theninserted into said coupling head, the sleeve at its. outersurface having normal snug fitting engagement with the inner surface of the wall of the coupling head; The large end ofthe part 96 and the corresponding end of the coupling sleeve project into the spaced recesses I20 of the key pin while the lug I22 on said pinis slidingly received in the recess IIl2. Thus in the rotative adjustment of the bushing with respect to the coupling-head and part v 96 of the member 94 to diametrically set tool I08 with re spect to the coupling head for a predetermined diameter bore, while the key lug I22 will eiiectively prevent rotative movement of the member 94 said member may have free radial movement in all directions with respect to the coupling head. After the adjustment has been made, the nut I32 isthen tightened against the end flange I28 of the bushing to force said bushing axially on the tapered end 96 of member 94, thereby expanding said bushingthroughout its length and tightly binding the same against the cylindrical surfaces of part 96 and the inner surface of the wall of the coupling head to frictionally lock the bushing against rotative movement from its adjusted position. In this case, also, the driving torque will betransmitted to member 94 by the key lug I22 independently of the bushing I24.

Referring now to the diagrams of Figures 13 and 14, which are equally applicable to both of the above described embodiments of the invention, in Figure-13 the axes of the work piece, the driving and coupling memberand the machine spindle are in accurate alignment; ,However, in practice when the driving and coupling member is connected to the machine spindle it often happens that due to burrs, dirt, worn surfaces, imperfect fitting of the shank of thedriving member in or on the spindle, or other causes, the axis of the shank is not in perfect alignment with the axis of the machine spindle. In such case, no matter how accurately an eccer'itricallyv adjusted tool holder may be manufactured, if in making the adjustment, the tool holding member is rotated about its own axis relative to the axis of the driving and coupling member, then the adjustment correctly reflects the scale setting only with respect to the latter axis and is incorrect with the relation to the axisof the machine spin dle.

In these diagrams, the tool settings T I T--2, and T3, correspond to the maximum, intermediate and minimum bore diameters B- -I B-2 and B--3, respectively, which are concentric to the machine spindle axis S. These toolsettings are produced by movement of the eccentric center of the adjustable bushing to positions El, E-2 and E-3 respectively in the path Pabout the axes of the driving and coupling member and the spindle. u

In Figure 14 axis D of the coupling'member is shown out of axial alignment with the spindle axis S. Of course, the displacement is greatly exaggerated in the drawing, as in'actualpractice it seldom exceeds a fractional thousandth of an inch. Since, in the present invention the tool holding member is positively locked against independent a'xial rotation, said holder and the cutting tool will be diametrically adjusted relative to the spindle axis in the movement of the eccentric bushing between the positions E'I, E-2 and E -3 to substantially the same respective positions indicated on the scale 90; when the spindle and driving member are cut-of alignment as in Figure 14 and when they are in axiaIalignment as in Figure 13. It is apparent that in Figure .14, ,ii the tool holding member also rotates about its own axis, a large error factor would be introduced in the setting of tool 30, since an additional lateral displacement of the tool relative to the spindle axis would occur as the eccentric center of the bushing is moved in the path P, so that the final setting of the tool would not accurately reflect the reading on scale 90.

From the above descriptiomit will be seen that I have provided a very simply constructed tool holder and. adjusting means therefor, whereby the cutting tool may be quickly set with a high degree of accuracy to a predetermined boring diameter with respect to the machine spindle,

regardless of exact alignment between the driving and coupling member and said spindle. It will also be noted that the tightening or looking pres-' sures between the tool holding member, the eccentric bu'shing and the coupling member are pro duced entirely by means of axial thrust forces, thereby obviating the, tendency to disturb the adjusted setting of the i061 which would be incident to the application ,of such forces in an angular direction relative tofthe axis of the tool holder. The positive and direct transmission of driving torque through the ,s'hiftable key to the tool holding member independently of the eccentric bushing, ,is also an important feature of the invention, since thepos'sibility of rotational movement of the bushing, or loosening of the coupled connection between the tool holding member and the driving member is thereby eliminated. In view of the simple structural form of the several parts, machining operations are simplified and they can be produced with extreme accuracy to thus obviate lost motion in the coupled connection, and disimrbance of the adjusted setting of the tool.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes'which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letters Patent is:

1. In an adjustable tool holder, a coupling member having a shank provided with a cylindrical coaxial socket at one end; a tool holding member and an eccentrically bored longitudinally split bushing assembled therein within said socket, said bushing being rotatively adjustable to diametrically position's aid tool holding member relative to the axis of said coupling member, the i001 hdl'cling' member and the bushing having opposed axially tapered surfaces constructed to"frictio'r'iallycoact in response-to axial movement of the" bushing in one direction to radially expand said bushifig and rigidly couple the tool holding member in adjusted position to said coup'ling member; and manually operable means comprising adjustable cam means mounted in the coupling 'meniber and coacting with terminal means on the tool holding member for exerting an axial thrust force upon said bushing to axially move said member and the bushing into the :oc'ket of the coupling member to coupling posi- 2. In an adjustable'to'ol holder, a coupling member having a shank provided with a cylindrical coaxial socket at one end, a tool holding member having an-"axially tapered concentric part of progressively increasing diameter, a longitudinally split adjusting bushing provided with a concentric exterior and an eccentric bore hav ing an 'iaiidally "tapered wall contactin az aid tapered part of-thetoolholding -member and an external surface concentri'c with and snugly fitting within said socket, said bushing being rotatively adjustable between the socket and tool holding member to diametrically position the tool holding member relative tothe axis of "thej coupling inemben-and additional inanually operable means for applying an axial thrust force to re1atively move said contacting tapered parts of the bushing and tool holding member and expand said split bushing into frictionally locked engagement with the coupling and tool holding members to retain the latter in its adjusted position.

3. The adjustable tool holder as defined in claim 2, wherein said manually operable means comprises a member adjustably coacting with means on said tool holding member to impart relative axial movement to said member and the bushing.

4. The adjustable tool holder as defined in claim 2, wherein said manually operable means comprises adjustable cam means mounted in the coupling member and coacting with terminal means on the tool holding member to axially move said member and the bushing into the socket of the coupling member.

5. The adjustable tool holder as defined in claim 2, together with means mounted in the coupling member for angular movement relative to its axis and coacting with means on said tool holding member to prevent axial rotation thereof in the independent adjustment of said bushing.

6. In an adjustable tool holder, a coupling member having a shank provided with a cylindrical coaxial socket at one end, a tool holding member and an eccentrically bored bushing assembled thereon within said socket, said bushing being rotatively adjustable to diametrically position said tool holding member relative to the axis of the coupling member, the wall of said socket, the tool holding member and the bushing having surfaces constructed to frictionally coact in response to axial movement of the bushing in one direction and rigidly couple the tool holding member in adjusted position to said coupling member, a pair of cam members movably mounted in the coupling member coacting with a terminal part on the tool holding member to restrain the latter against independent rotation in the adjustment of the bushing, and adjustable means connecting said cam members diametrically movable as a unit with said members and tool holding member relative to the coupling member and operable to relatively adjust said cam members in effective engagement with said part to axially move the tool holding member and bushing to coupled position within said socket of the coupling member.

7. In an adjustable tool holder, a coupling member having a shank provided with a cylindrical coaxial socket at one end, a tool holding member and an eccentrically bored bushing thereon within said socket, said bushing being rotatively adjustable to diametrically position said tool holding member relative to the axis of the coupling member and longitudinally split at its opposite ends to provide axially spaced relatively expansible and contractible end portions, said eccentric bore at one end of the bushing progressively increasing in diameter, said tool an an "its-adjusted position to i e memh r ,liavina a, co cent c t s -v conica part" "nt 't gfsaid endfoff' the bore, the other, ,e d "o fjthe bushing havingj-"an fexternal annular 1' aperirfig surface contacting {an internal tapering n said socket, and 'manually operablefmeanjs r axially urging the) tool holdi ml beaa u h ain csaidy d e tract" said-bushing at its latter end to alfbi'ndingpngagement with the tool ht'al'ding member and'toexpandth"other end of the bushing into binding engagement with-the socket wall and thereby frictionally couple the tool holding memsaid coupling member. I

8. The adjustable tool holder as defined in claim '7, wherein said manually operable means comprises means coacting with a part on the tool holding member to restrain the latter against independent rotation in the rotative adjustment of the bushing.

9. The adjustable tool holder as defined in claim 7, wherein said manually operable means comprises a pair of relatively adjustable cam members mounted in the coupling member and directly coacting with terminal means on the tool holding member to restrain the latter against independent rotation and transmit driving torque from the coupling member to the tool holding member independently of said bushing.

10. In an adjustable tool holder, a coupling member having a shank provided with a cylindrical coaxial socket at one end, a tool holding member having a portion progressively increasing in diameter to one end of said member, a longitudinally split adjusting bushing having an eccentric tapered bore assembled on said end portion of the tool holding member and an outer surface concentric with said socket and snugly fitting therein, said bushing being rotatively adjustable to diametrically position the tool holding member relative to the axis of the coupling member, and manually operable means carried by said tool holding member, and coacting with the bushing to relatively move said member and bushing axially in opposite directions and radially expand the split bushing to frictionally couple said tool holding member in its adjusted position to said coupling member.

11. The adjustable tool holder as defined in claim 10, wherein said manually operable means comprises a nut threaded on said tool holding member in adjustable engagement with the outer end of the bushing to axially move the bushing into the socket upon said end portion of the tool holding member.

12. The adjustable tool holder as defined in claim 10, together with a torque transmitting connection between the coupling member and tool holding member embodying means restraining said tool holding member against rotation with or independently of the bushing relative to said coupling member.

13. The adjustable tool holder as defined in claim 10, together with key means mounted in the coupling member coacting with means on said tool holding member constructed and arranged to permit relative movement between said key means and tool holding member substantially diametrically of the coupling member while preventing axial rotation of said tool holding member with respect to the bushing and coupling member. s

14. The adjustable tool holder as defined in claim 10, together with a pin mounted in the coupling member and having a key lug, said end f sai gqr loa 9 th z ql. h ldii g memb r havip .19? hwia i p wd sub tantial y gormal tq t e axis 9. Pin and in. whim iai k u is 9.- bly eaa ed, t r tra n th ta h min m m a fiinfit i d ndent a a rqta ion and, permi rla ive an i ar mq emam b twe n id to hq li memb @1451 t n wi res ect o. he

ecmp iiig membe mom. I

nwmmcms .1m)

file of this patent:

Number Number Dam June 20, 1911

Images