Dec. 3, 1946. 2,412,038 E. C. FREISEN RETRACTABLE TYOOL HOLDING MEANS ì -Filed Aug. l2, 1944 T. z TH lé l I ".5 t Y(5a/6aéJ 4= 2‘/ L Q á a ‘\ d we k K) ~N I i` 'n ' ®` ` d I w Q >< i Ñlä d È ! \\_ \ F \ d / ä * Vîwr ` 'N ä N f )3' "am oI "’ /È Q x i \ á ` . N 'Q ‘ï N u 'n ,l > ` vn; 9 I \ _Imi Y ¿aA.25 P, a6 ` m l ä 24/ _ »INVENTOIL [PWA/P0 C fk5/55N .BY / /I v ATTOENEY 2,412,038 Patented Dec. 3, 1946 -UNITED STATES PATENTQoFFicE i RETRACTABIQE rrooL HoIQDiNG MEANS Edward C. Freisen, Detroit, Mich., 'assigner to' Ex-Cell-O Corporation, Detroit, Mich., 'a cor poration of Michigan Application August 12, 1944, Serial No. 549,261 7 Claims. (Cl. 77--3) 2 l The present invention pertains to a retractable tool holding means. . vThe principal object of my invention is to pro vide a holder for a fly cutting boring tool con structed and arranged'to place the tool alter natively in two possible positions and to cause the cutter thereof, when in a cutting position, to have a predetermined radius of rotation and, when in a non-cutting position, to have a lesser radius of to by three equally spaced screws I6 insertable through holes I6a. At the rear end of shaft I2 is >fixed a spindle shaft driving member I8 which may Well include V belt grooves adapted to be driven from a conventional V belt pulley on a suitable motor,f_not shown.` i YWhile my retractable tool holding means may be alternatively placed in its cutting or retracted position u by any convenient mechanism either rotation. rI‘he second or retracted radius of ro 10 manually or power actuated, IV shall here describe an hydraulically actuated means which maybe' tation may differ from the cutting radius by a preferable when my invention is used in associ minute distance, usually only _a fraction of one ation with an hydraulically actuated machine. thousandth of an inch or a few thousandths of 'an inch, to cause the point of the cutter to radially Shaft I2 is hollow and surrounds a rod 20 ax retract from or clear the finished surface of the 15 ially movable therein by its connection with pis. ton 22 which is reciprocable in cylinder bore 23 bored workpiece so that, in the reverse axial move formed in member I _8.A _The rearward face of pis ment between the workpiece and the tool which ton 22 is continuously in communication with takes place during withdrawal of the tool (or the work) following a boring operation, the point of passage P1 formed in s_wivel connector member 24 the cutting tool cannot contact the finished bore 20 which isiiixed> to and rotatable with member I8, to mar or scratch the latter. the member 24 being rotatable in non-rotatable Another object of my invention is to permit connector member 2t.` Member 24 is formed with a central axial bore which fittingly encirclesv a the cutting tool to be shifted from one to another reduced diameter. rear end portion of rod 20 con of its two positions whether ornot the boring tool is rotating and, in instances where it is more 25 taining passage Pz which communicates with the forward face of piston` 22. Rod 20 may move axi convenient to rotate thel workpiece than to ro ally in member 24 with movement of piston y22 in tate the tool, the tool may be' alternatively placed its bore 23. Throughswivel connector member ' in a cutting or non-cutting position at will, _24, passage P2 is in constant communication with though the tool holder be non-rotatable. AA structure including my improved tool hold 30 passage P3 and conduit Ci, also through this swivel connection, conduit C1 is continuously maintained ing means is clearly illustrated in the following in communication with passages Pi'. Conduits Ci, drawing in which; C2 may be alternativelyconne'cted with a supply jïFig. 1 is a longitudinal sectional View of a bor of hydraulic iiuid under pressure P or with ex ing spindle including a retractable tool holding 35 haust E ,through conventional two-Way valve YV means embodying the features of myinvention. i which may be actuated by handle CJ Piston 22 Fig.v 2 is a fragmentary cross sectional View in may thus be caused to have iiuid under pressure cluding my tool holding means drawn to larger applied alternatively to either of its faces. scale for clarity; and ' The forward end of rod 20 is formed with a Fig. 3 is a sectional view through a bushing il lustrative of one simple form of workpiece which 40 frustro-conical end 32 having its axis coinciding with rod 20 and‘shaft I2. The frustro-’conical may advantageously be bored by the embodiment end of the rod is surrounded by an annular mem of my invention herein illustrated. Í ber, 28 fixedly'pinned to the rod and axially re Referring more particularly to the drawing, the ciprocabl‘e therewith in a suitable enlarged guide improved tool holding means may be incorporated in Ía spindle 5 substantially of the structure de 45 bo're formed in the forward end of shaft I2. The tool holding means TH, when a section scribed in United States Patent No. 2,012,677, on one side _of the axial centerline is considered, issucdAugu-st 27, 1935, to Carroll R. Alden, and is seen to be of U shaped jc’ross section support including precision antifriction spindle bearings ing a central hub portion H which,’at its forward of the sort illustrated in method Patent 1,7 08,491, 50 end, is provided with an axial bore in which re issued April 9, 1929, to the said Alden. movable boring bars 6 of various selected lengths The_spindle shaft I2 is supported for rotation and heldas by set‘screws 601;l may support a tool T in the structure 5 cn the bearings I4 and is formed with its cutting point at a predetermined radial at its forward end with a face plate member l2a' distance from the axis of the boring' bar l6'._ ‘ " ' for rotatably supporting the retractable tool hold The U- shaped cross section- of the holderTH ing'means'TH which is preferably fastened there 55 2,412,038 3 4 between its supported surface abutting face plate I2a and the hub portion H, especially the di aphragm portion D, is deformable. stantially normally thereto and spaced from said When the rod 20 is withdrawn to its rearmost position as shown in Fig. 2, the annular member 28 centralizes the rear portion of the hub mem ber H and Lpreferably causes the `axes of boring bar 6, tool holder TH, lrod 2U and shaft I2 all to lie in a single straight line. Though any con venient means may be used to move the rear supported extremity thereof, a tool member car ried by an extension of said hub on one side of said deformable member, an opposing extension of said hub on the other side of said member, and means for laterally moving the extremity of said opposing hub extension relative `to said principal support to control the» deflection of said deform able memberwhereby to displace the axis of said 10 hub. most end of hub H, in the present instance rod20 is caused to have it forwardmost position, as " 2. In a retractable tool holding means, a prin cipal support member, a deformable member of substantially circular disc shape fixed to said shown in Fig. 1, upon appropriateA application of hydraulic pressures on piston 22. Injthe illus ¿principal support member at a plurality of points trated structure the .central recessed 'bore 28a 15 adjacent the periphery of said deformable member, a hub member supported by said disc shaped de then surrounds the acorn shaped rear end of hub formable member substantially »centrally there H with a suitable clearanCetherebetWeen. >The of,` a tool member carried by an extension of said rearrnost end of hub H is formed with an internal frustro-conical surface 30 having the axis thereof 'hub member, an opposing extension of said hub slightly eccentrically displaced from the axis of 20 member, and means for moving the extremity of said opposing hub extension relative to said prin hub H and boring bar 6 as illustrated to an exag gerated scale'by the dimension 34. When the cipal supportI member to control the deformation of said deformable member whereby to displace vconical `end 32 is forced into the conical recess 30, as shown in Fig. l, its eccentric axis is ele the axis of said hub member. vated into coincidence with the true axis of 3. In a reti'actable tool holding means, a hol spindle I2 causing deformation of the diaphragm low rotary machine spindle, a deformable mem portion D which retracts the tool T fby shortening ber substantially of circular disc shape fixed to> lthe radial distance from the cutting point of tool T to’V the true axis of rotation of shaft I2 thus causing tool T to describe a-smaller circle of rev olution than it describes »when the tool is in its 'non-retracted boring position, as shown in Fig. 2. Because of the small magnitude of the change in 'radial distance of the tool T between its cutting said machine spindle at a plurality of spaced points adjacent the periphery of said member l310 and with the central axis of said member gen erally coincident with the axis of rotation of said spindle, a hub member supported byk said de formable member substantially centrally thereof, a tool member carried by one end of said hub 4andits retracted position, the workpiece W of 35 member, and meansv for moving the opposite end Fig».,3 has been fragmentarily shown in Fig, 2 in of said hub member relative to the axis of said relation to the tool T, and an exaggerated dimen spindle to control the deformation of said de sion 36 has been Vapplied between the ñnish bored formable member whereby to alter the radial internal diameter of the workpiece and the dot distance from a point on said -tool member to theV fted'line indicating the boundary line of tool ro y40 axis of said spindle. tation the retracted position. The axis of the 4. In a retractable tool holding means, a hol hub I-I and boringbar-Iì being considered to pivot low rotary _machine spindle, a deformable mem over the point when the diaphragm D is reflected by >placing the parts `in the position shown in ber substantially of circular disc shape fixed to said machine spindle at a, plurality of spaced points adjacentthe periphery of said member vand. with the central axis of said member gen erally coincident with the axis of rotation of said normalcutting radius of rotation when table 2 machine spindle, a hub member supported by ismoving in its forward or feeding direction, it said deformable member substantially centrally is `sometimes preferable, especially ywhen my in ventionis incorporated in an hydraulically actu 50 thereof, a tool member carried by _one end ofsaid hub member, a member axiallymovable in said ated machine, to omit the control valve >V and hollow machine spindle, means _effective upon connect the conduits C1, C2 with like hydraulic conduits (not shown) which alternatively supply axial movement of said last mentioned memberin orV discharge 'Y fluid under'pressure for the hy said spindle for moving the opposite end of said hub'jmember to tilt the axis of said hub> member n draulic actuator of machine table (not shown) relative -to the axis of said spindle, and means in such ‘manner that piston 22 is forced to its ` rearmost ‘position when table moves toward the for moving said axially movable member. Fig. 1. " « ' v ` v ` v To insure-that the "tool T will always have its tool T and is forced to its retracted position as shown in Fig. 1 when the table moves away from the‘tool T. It will be apparent that my improved retract lable tool holder is susceptible to many modifica tions and alternative constructions 'including changes in size, shape, means of actuation and arrangement of its parts without departing from thefspirit of my invention and I do not intend to‘limit'thescope thereof in any way other than by the v'appended claims. ` 5. In a retractable tool holding means, a hol low rotary machine spindle, a deformable mem ber fixed to said machine spindle, a hub mem ber supported by said deformable member and vhaving its axis substantially coincident with the said> spindle axis'and having axial extensions 'at bothl sides- of said deformable member, a tool member carried by one end extension of said hub member, a member axially movable _in said hollow machine spindle, cam means onsaid, last mentioned member effective upon axial move „ ment of said last mentioned member in saidispin 70 dle for engaging the opposite .endr extension> of cipal support, a deformable diaphragm member said hub member to move said hub member rela Vl; vclaim as my invention: ' . ' ' LfIn‘a retractable tool holding means, a prin rigidly fixed to said principal support adjacent an extremity of said deformable member and hav ing a 'flexible portion, a hub supported by the flexible portion of said deformable member sub tive to the axis rof said spindle, and means_for moving said axially movable member. , _` . i» 6. In a retractable tool holding means, a hollow. rotary machine spindle, 'a tool supporting mem 2,412,038 5 6 low rotary machine spindle, a tool supporting member rigidly secured to said spindle and having a central deformable diaphragm extending trans versely of and in alignment with the spindle axis, with a socket adapted to receive an axially pro CII the outer face of said diaphragm being provided with means to support an outwardly projecting jecting tool member, the inner face of said dia tool member, the inner face of said diaphragm phragm being formed with a central projection being formed with a central projection normally normally extending coaxially With said spindle, extending coaxially with said spindle, the inner the inner end of said projection being formed end of said projection being formed with a cam 10 with a frusto-conical recess deñning a cam sur surface, an actuating member extending axially face normally eccentric to the spindle axis, an ber rigidly secured to said spindle and having a central deformable diaphragm extending trans versely of and in align-ment with the spindle axis, the outer face of said diaphragm being formed actuating member extending >axially through said spindle and having a conical end cam adapted for movement axially into and out of said recess respectively to deflect or release said projection and said diaphragm, and a concentric tubular guide on said member extending in telescopic relation with the inner end of said projection and movable into centering engagement there through said spindle and having an end cam sur« face adapted for movement into and out of en gagement with said ñrst mentioned surface re spectively to laterally deflect or release said pro jection, and a guide on said member movable into engagement with said extension upon disengage ment of said cam surfaces to insure positive 1o cation of said projection and diaphragm in nor with upon retraction of said cam from said recess. 20 mal position. '7. In a retractable tool holding means, a hol EDWARD C. FlîtEISEN.