US3209571A

US3209571A - Tube flaring tool

Info

Publication number: US3209571A
Application number: US209959A
Authority: US
Inventors: Frank R Wilson
Original assignee: Parker Hannifin Corp
Current assignee: Parker Hannifin Corp
Priority date: 1962-07-16
Filing date: 1962-07-16
Publication date: 1965-10-05
Anticipated expiration: 1982-10-05

Description

Oct. 5, 1965 F. R. WILSON 3,209,571

TUBE FLARING TOOL Filed July 16, 1962 5 Sheets-Sheet l INVENTOR:

Oct. 5, 1965 Filed July 16, 1962 F. R. WILSON TUBE FLARING TOOL d Sheets-Sheet 2 INVENTOR 1 BY WORQEY Oct. 5, 1965 F. R. WILSON 3,209,571

TUBE FLARING TOOL Filed July 16, 1962 5 Sheets-Sheet 3 76 5% g; INVENTOR 71 72 Farm/e1? W/z S United States Patent 3,209,571 TUBE FLARING TOOL Frank R. Wilson, Memphis, Tenn., assignor to Parker- 'Hannifin Corporation, Cleveland, Ohio, a corporation of Ohio Filed July 16, 1962, Ser. No. 209,959 17 Claims. (CL 72124) This invention relates to a tube flaring tool, and more particularly to a hand tool for more accurately flaring the end of a tube.

In the previous patents of Frank R. Wilson, such as No. 2,711,773, the flaring cone is provided with conical rollers rotatably mounted in recesses in the periphery of the cone. The cone is mounted on a threaded shaft, which is turned by hand to axially drive the cone into the open end of the tube and cause the rollers to spin against the inner surface of the end of the tube to form a flare. Because the shaft threadedly engages a yoke fixed to the tube clamping means, the axial movement of the flaring cone depends on the pitch of the threads.

It is therefore an object of this invention to provide a tube flaring tool in which the axial movement of the flaring cone has been reduced to :a fraction of the pitch of the threads for each revolution of the shaft.

Another object of this invention is to provide a tube flaring tool having an increased mechanical advantage over other known hand-operated tube flaring tools.

Another object of this invention is to provide a handoperated tube flaring tool which is adapted to form a more gradual, and therefore a more accurate flare in the end of the tube.

A further object of this invention is to provide a tube flaring tool having an improved tube clamping means.

Another object of this invention is to provide a tube flaring tool having means for locking the yoke in various adjusted positions relative to the tube clamping means.

A further object of this invention is to provide a tube flaring tool having means for indicating the amount of flaring required for tubes of various thicknesses.

Another object of this invention is to provide a tube flaring means having a plurality of die inserts for holding tubes of different diameters during the flaring operation.

Further objects and advantages of the invention will be apparent from the following description taken in conjunction With the drawings, wherein:

FIG. 1 is a front elevation of the invention;

FIG. 2 is an end elevation of the invention;

FIG. 3 is a section taken along the line 3-3 of FIG. 1;

FIG. 4 is a section taken along the line 44 of FIG. 2, with the flaring cone and tube in position for initiating the flaring operation;

FIG. 5 is a section taken along the line 55 of FIG. 4;

FIG. 6 is a section taken along the line 6-6 of FIG. 1;

FIGS. 7, 8 and 9 are sectional elevations of die inserts for receiving tubes of three different diameters for the flaring operation;

FIG. 10 is a section taken along the line 1010 of FIG. 2; and

FIG. 11 is an enlarged, fragmentary front elevation of the compensator.

Referring now more particularly to the drawings, the flaring tool comprises generally a yoke member 10, a tube clamping means 11, and a tube flaring means including a tube flaring head 12 mounted on one end of a shaft 13 adapted to be rotated by a handle 14 and advanced against the upper end of a tube 15 held in the clamping means 11. A late-rally extending handle 16 is fixed to the yoke 10 by means of a threaded extension 17 engaging a mating threaded opening in a boss 18, or by any other conice venient means. Such an arrangement facilitates the manual operation and the portability of the tool by providing a fixed handle 16 to be held in one hand by the operator, while the other hand is employed in rotating the handle 14 to manipulate the tube flowing head 12.

The yoke member 10 is made adjustable toward and away from the tube clamping means 11 by means of a pair of

posts

20 and 21 parallel to the shaft 13 and extending from the top of the tube clamping means 11 through slidably

mating openings

22 and 23 respectively, in the yoke 10. The top portion of the

posts

21 and 22 are provided with uniformly spaced

circumferential grooves

24 and 25 for engagement with the corresponding notches 27 at the extremities of a latch 28 mounted on top of the yoke 10 for pivotal movement about the axis of the shaft 13.

In order to rotatably support the shaft 13 and the head 12, a central tubular opening 30 is formed through the yoke 10 having an axis parallel to and between the

holes

22 and 23. An outer sleeve 31 is press-fitted upward through the opening 30 where its upward movement is limited by a ring flange 32 which is received in a corresponding recess surrounding the lower end of the opening 30. The upper end of the outer sleeve 31 extends through a central opening 33 in the latch 28 by an amount substantially equal to the thickness of the latch to provide a rotary bearing for the latch 28.

Adapted to slidably and rotatably fit within the inner surface of the outer sleeve 31 is an intermediate sleeve 35 which has a smooth outer cylindrical surface and is internally threaded. The bottom portion of the sleeve 35 is also provided with a laterally extending annular flange 36 depending slightly below the flange 32 in order to provide an annular race for the ball bearings 37. The upper portion 38 of the intermediate sleeve 35 extends slightly above the top of the outer sleeve 31 and is externally threaded to engage an internally threaded nut 39 which extends over the top of the outer sleeve 31 and a portion of the latch 28 to hold the latch 28 in place. The nut 39 may be secured against rotation by means of a set screw 40, or other suitable means. Thus, the intermediate sleeve 35 is adapted to freely rotate within the outer sleeve 31, but is securely held against axial movement.

An externally threaded inner sleeve 42 extends through and in threaded engagement with the internally threaded intermediate sleeve 35. The inner sleeve 42 is substantially longer than the intermediate sleeve 35 in order to provide ample room for the inner sleeve 42 to advance and retract the tube flaring head 12 a sufficient axial distance to properly flare the end of the tube 15. The lower end of the sleeve 42 is provided with a laterally extending flange or annular cap 43 which diverges downwardly and outwardly.

The shaft 13 rotatably engages the inner sleeve 42. The lower end of the shaft 13 is fixed to or integrally forms a coaxial flaring cone 44, which is a part of the novel flaring head 12 made in accordance with this invention. Together, the shaft 13 and flaring member or cone 44 form a flaring spindle. In order to further facilitate the rotary motion of the shaft 13 within the sleeve 42, and the cone 44 within the cap 43, the ball bearings 45 are located within a bearing race 46 formed by the base surface of the flaring cone 44 and the lower edge of the inner sleeve 42. The cone 44 is held in its rotary position against axial movement by means of a ring 47 fitted around the upper portion of the shaft 13 and against the top of the inner sleeve 42, and secured in position by means of a set screw or pin 48.

A plurality of uniformly spaced conical rollers 50 are rotatably supported by bearings 51 which are screwed through mating openings in the cap 43, so that the bearings depend from the lower surface of the cap 43. The bearings 51 are coaxial with the conical rollers 50 and support the rollers in rolling engagement with the conical surface of the flaring cone 44. In FIG. 5, three rollers 50 are shown substantially the same size as the flaring cone 44.

The rollers 50 are stabilized and laterally supported for rotary movement by means of the spacer elements 52, which are also fixed to and depend from the cap 43 by means of the pins 53. The spacer elements 52 provide recessed conical surfaces in which the rollers may rotate. Although the outer surfaces of the spacer elements 52 are conical in order to fill out the substantially over-all conical shape of the flaring head 12, still the outer surfaces of the rollers 50 extend beyond the outer surfaces of the spacer elements 52 so that the rollers 50 alone will be exposed to flaring engagement with the end of the tube 15.

It will be noted in FIG. that the leading roller surfaces 54 are slightly more exposed than the trailing surfaces 55. The purpose of this construction is to present as much unsupported roller surface to engagement with the end of the tube as possible, and still support as much of the trailing surfaces 55 as possible with the spacer element 52. Although this exposure of the rollers 50 is greater in the upper portion of the flaring head 12, the exposure of the roller surfaces beyond the spacer elements 52 decreases toward the lower portion of the head 12 in order to lend greater support to the tips of the rollers 50.

In order to prevent the rollers 50 fom slipping on the surface of the flaring cone 44 when the shaft 13 is being rotated and the rollers 50 are engaging the end of the tube 15, a pair of

ring plates

59 and 60 are provided to engage the outer surfaces of the rollers 50. The

ring plates

59 and 60 also act as a clutch to engage the rollers 50 in order to drive sleeve 42 to feed the flaring head 12, whether the rollers 50 are engaging the tube 15 or not. The upper ring plate 59 is provided with a circular opening having a peripheral edge 61 which is beveled downwardly and outwardly in order that it may frictionally engage the outer base portions of the rollers 50. The lower r-ing plate 60 is also provided with a circular opening of approximately the same diameter as the opening in the ring plate 59, but having a peripheral edge 62 which is beveled upwardly and outwardly to frictionally engage the side surfaces of the conical rollers 50 adjacent the base portions. The upper and

lower ring plates

59 and 60 are resiliently pressed together by means of screws 63, each screw extending through both plates and provided with a coil spring 64 between the head of the screw and the upper ring plate 59. By tightening the screw 63, the ring plate 59 is urged toward the ring plate 60 and causes the beveled edges 61 and 62 to squeeze and frictionally engage the base and side portions of the conical rollers 50.

Thus, even when there is extreme pressure between the surfaces of the rollers 50 and the inner end surfaces of the tube 15 to be flared, the rotary peripheral motion of the rotating flaring cone 44 will be transmitted through the rotating surfaces of the rollers 50 to the

ring plates

59 and 60, which are constrained against rotational motion. Therefore, for every revolution of the flaring cone 44, the cap 43 will only be rotated a fraction of a revolution, depending upon the transverse dimensions of the flaring cone 44 and the rollers 50. By this means for reducing the rotary motion of the flaring head 12, the flaring of the tube 15 may be controlled at a more gradual rate to refine the flaring operation.

Although the

plates

59 and 60 are constrained against rotary motion, they are provided with ears having circular openings 65 for slidably receiving the respective posts and 21. In this manner, the

plates

59 and 60 may move axially of the

posts

20 and 21 at the same rate as the axial movement of the flaring head 12.

The tube clamping means 11 comprises a pair of die blocks 67 and 68. One edge of the die block 67 is hinged to the opposing edge of the die block 68 by means of the tenon 69 depending from the post 20. A similar tenon 70 depending from the bottom of the post 21 extends through the opposite end of the die block 67. The die block 68 provides a compound locking means by having a clamp 71 pivoted within a recessed portion of the die block 68 by means of a hinge pin 72. The clamp 71 is adapted to pivot in the same plane as the die blocks 67 and 68. One extremity of the clamp 71 is provided with an open-ended slot 73 to receive a swing bolt 74 pivoted to the tenon 70 and adapted to swing into and out of engagement with the slot 73 and be secured therein by a wing nut 75. A bolt 76 is pivoted to the other tenon 69 and adapted to extend through a mating opening 77 in the opposite extremity of the clamp 71 and to be secured therein by another wing nut 78. Thus, the die blocks 67 and 68 may be secured together by compound leverage, by first closing the die blocks, swinging the bolt 74 into the slot 73 and securing the wing nut 75. The other wing nut 78 is then tightened on the bolt 76 to apply additional pressure to the clamp 71.

The mating interior portions of the die blocks 67 and 68 are recessed to receive in registering engagement the opposing die halves 80 and 81. The upper peripheral inner edges of the die halves 80 and 81 are chamfered to the same angle that the extreme outer edges of the cones 50 make with the axis of the shaft 13. The upper peripheral flanged edges 82 and 8-3 of the die halves 80 and 81 are secured to the die blocks by means of the screws 84 having mutilated heads 85. The bottoms of the mutilated heads 85 are substantially flush with the top surfaces of the

die flanges

82 and 83 so that they may be rotated through approximately a quarter of a turn to secure the die halves 80 and 81 in place. Aligning pins 86 extending upward from the die blocks 67 and 68 may also be provided to register with mating apertures in the

flanges

82 and 83 to locate the die halves 80 and 81 in their respective positions in the die blocks 67 and 68.

As a further improvement of this invention, the die halves are provided in the different shapes disclosed in FIGS. 7, 8, and 9, in order to accommodate

tubes

15, 15", and 15" of various outer diameters. The outer diameters of the die halves 80, 80', 80", and 80 are the same. However, the inner diameters of the dies are adapted to correspond with the outer diameters of the various tubes 15-15. Since the chamferred internal peripheries of the

die flanges

82 and 83 will maintain the same angle, the height of the internal cylindrical surface of the dies will diminish linearly with the internal diameter of the dies. Although the flaring head 12 will extend the same distance below the top of the

flanges

82 and 83, the penetration of the flaring head 12 into the tube 15 will be progressively less with the decrease of the outer diameter of the tube to be flared.

As an additional feature of this invention to determine the starting point of the flaring head 12 for various tube or wall thicknesses, an internally threaded collar or compensator 88 having graduations 89 thereon for the various tube thicknesses is adapted to engage the externally threaded inner sleeve 42 between the top of the cap 43 and the bottom of the flange 36, as best disclosed in FIGS. 1, 2, 4 and 11. The top of the cap 43 is provided with an arrow (FIG. 11) to register with the desired graduation 89 on the collar 88. A lug or pin 91 extends laterally from the periphery of the collar 88 to engage a stop pin and limit the rotary movement of the collar 88 upon the sleeve 42 to less than 360.

In order to provide a means for burnishing the flared end of the tube 15, after the flaring operation is completed, the same mechanism is employed as that disclosed in Patent No. 2,711,771 of Frank R. Wilson, issued June 28, 1955. A tooth 93 is fixed to and extends radially from the flange 36. A cooperating double-ended dog 94 is pivoted about the pin 95 whose axis is parallel to the axis of the rotary shaft 13. The dog 94 is provided with abutment portions 96 and 97 at each end thereof and spaced from the tooth 93 in such a manner that when the dog 94 is swung in one direction, the abutment portion 96 will engage and stop the tooth 93 to prevent further rotation of the sleeve 35 with respect to the sleeve 31 in one direction. Counter-rotation of the sleeve 35 permits the tooth to pass beneath the abutment portion 97, engage the opposite side. of the abutment portion 96 to pivot the dog 94 to its opposite extreme position whereby the abutment portion 97 will prevent further counter-rotation of the sleeve 35.

The operation of the invention is as follows:

With the die blocks 67 and 68 unlocked and pivoted to their open position, the appropriate die halves 80 and 81, such as those disclosed in FIG. 4, are selected for the appropriate outer diameter of the tube 15 to be flared, and inserted into their respective die blocks 67 and 68 over the aligning pins 86. The screws 84 are then rotated approximately a quarter-turn so that a curved portion of the mutilated head 85 will overlie and secure the

die flanges

82 and 83 in place. The tube 15 is then inserted through the die half 80 until the upper periphery of the tube 15 engages the rollers 50, which should be at a position very slightly above the top of the flange 82. The die block 68 is then pivoted about the tenon 69 to its closed position about the tube 15, and swing bolt 74 is pivoted into its corresponding slot 73. The wing nut 75 is then tightened against the corresponding end of the clamp 71. The other wing nut 78 is then tightened on the bolt 76 to apply compound pressure upon the die halves 80 and 81 and the tube 15.

Before the tube 15 is clamped by the clamping means 11, the yoke may be axially adjusted upon the

posts

20 and 21 by pivoting the latch 28 so that the

notches

26 and 27 will disengage the

corresponding grooves

24 and 25. After the yoke 10 has been axially adjusted on the

posts

20 and 21, the latch 28 is then rotated to engage the

notches

26 and 27 with their

respective grooves

24 and 25. Actually the graduated

grooves

24 and 25 are more appropriately employed in reaming and double: flaring operations outside the scope of this invention.

The graduated collar 88 should be set before the tube is clamped, by aligning the graduation 89 corresponding to the thickness of the tube 15 with the arrow (FIG.

11). When the collar 88 is properly set, the shaft 13 is counter-rotated until the top of the collar 88 abuts against the bottom of the flange 36. In this position, the outer surfaces of the rollers 52 in the flaring head 12 should abut against the upper edge of the inner surface of the tube 15 in clamped position. The operator then grasps the handle 16 in one hand and turns the rotary handle 14 with the other hand until the tooth 93 has pivoted the dog 94 and engages the abutment portion 97 to prevent further rotation of the sleeve 35. Continued rotation of the handle 14 will cause the inner sleeve 42 to be driven downwardly by virtue of its threaded engagement with the internal threads of the intermediate sleeve 35 and by virtue of its linkage with the faster rotating shaft 13 through the flaring cone 44, the rollers 50, and the collar 43 which is integral with the inner sleeve 42. The rotation of the flaring cone 44 will cause the rollers 50 to roll in the tracks provided by the beveled edges 61 and 62 of the

ring plates

59 and 60. The travel of the outer peripheries of the corners of the rollers 50 within the peripheral tracks 61 and 62 will carry the .cap 43 with them and thus drive the sleeve 42 downward with respect to the locked intermediate sleeve 35. This reduced rotation of the flaring head 12 will produce a more refined and gradual flaring operation in the end of the tube 15. When the end of the tube has been flared to conform to the chamfered ends of the

flanges

82 and 83, the flaring operation is completed, and the operator begins counterrotating the handle 14. The first counter-rotary movement of approximately one and three-quarters turns will result in a strictly rotary movement without any axial movement of the flaring head 12, which will produce a burnishing operation upon the flared end of the tube 15. This burnishing operation is caused by the free movement of the tooth 93 for one and three-quarters turns before it is engaged by the opposite abutment portion 96. After the tooth 93 engages the abutment portion 96, then further rotation of the sleeve 35 and the sleeve 42 as a unit will cease, and only the sleeve 42 will rotate upward to withdraw the flaring head 12 from engagement with the flared end of the tube 15. The

wing nuts

75 and 78 are then unthreaded, the swing bolt 74 swung away from the slot 73, and the die block 68 swung away from the die block 67 to permit the removal of the flared tube 15.

It will thus be seen that a more sophisticated flaring tool has been devised which will produce a flare in the end of a tube with a greater quality because the flaring operation can be carried out more gradually and with greater control.

It will be apparent to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof, and therefore the invention is not limited by that which is shown in the drawings and the specifications, but only as indicated in the appended claims.

What is claimed is:

1. A tube flaring tool comprising:

(a) a yoke,

(b) a sleeve rotatably mounted in said yoke,

(c) a shaft extending through and rotatably journaled in said sleeve,

(d) a flaring cone fixed to one end of said shaft,

(e) means for rotating said shaft in said sleeve,

(f) a roller,

(g) means on said sleeve for rotatably supporting said roller in rolling engagement with said cone,

(h) threaded feed means connecting said sleeve and said yoke operable to move said sleeve relative to said yoke, and

(i) annular means supported on said yoke for engaging said roller to tansmit the rotary movement of said cone to operate said feed means.

2. The invention according to claim 1 in which said roller is conical.

3. The invention according to claim 2 in which the dimensions of said flaring cone and said conical roller are substantially the same.

4. A tube flaring tool comprising:

(a) a yoke having an opening therethrough,

(b) a sleeve extending through said opening,

(c) threaded feed means for connecting said sleeve in said opening for rotary and axial movement therethrough,

(d) a shaft extending through and rotatably journaled in said sleeve,

(e) a flaring cone fixed to one end of said shaft,

(f) means on the other end of said shaft for turning the same,

(g) an annular cap integrally forming the base of said sleeve,

(h) a plurality of rollers,

(i) means on said cap for rotatably supporting said rollers at spaced intervals around and in rolling engagement with said flaring cone, and

(j) annular means supported on said yoke for frictionally engaging the outer surfaces of said rollers.

5. The invention according to claim 4 in which spacer means are fixed in depending relation from said cap between said rollers, said spacer means comprising recesses for receiving said rollers, and the outer surfaces of said rollers extend outwardly slightly beyond the outer surfaces of said spacer means.

6. The invention according to claim 4 in which said annular means comprise a track for receiving the base corners of said rollers.

7. The invention according to claim 6 in which said track comprises a pair of rings, one of said rings engaging a portion of the base adjacent the corners of said rollers, and the other ring engaging the outer side surfaces of said rollers adjacent said base corner, and means for adjustably compressing said rings together.

8. The invention according to claim 4 in which means are supported on said yoke for guiding said annular means to move axially with said rollers.

9. A tube flaring tool comprising:

(a) a yoke having an opening extending axially therethrough,

(b) tube clamping means,

(0) posts fixed to said tube clamping means,

(d) guide holes formed axially in said yoke for slidably receiving said posts,

(e) means on said yoke for locking said posts in selected adjusted positions to permit axial movement of said clamping means relative to said yoke,

(f) a sleeve extending through said opening,

(g) threaded feed means connecting said sleeve to said opening for rotary and axial movement thereof,

(h) a shaft rotatably journaled coaxially in said sleeve,

(i) a flaring cone fixed to one end of said shaft,

(j) means on the other end of said shaft for turning the same,

(k) an annular cap integrally forming the base of said sleeve,

(1) a plurality of rollers,

(m) means on said cap for rotatably supporting said rollers at spaced intervals around and in rolling engagement with said flaring cone,

(n) annular means for frictionally engaging the outer surfaces of said rollers, and

(0) means for guiding said annular means axially of said posts with the axial movement of said shaft.

10. The invention according to claim 9 in which said tube clamping means comprises a pair of die blocks, each of which is adapted to receive a mating die half, means for hinging adjacent edges of each of said die blocks to one of said posts, said other post being fixed to one of said die blocks, a bolt hinged to each of said posts, a clamp, means for pivoting said clamp to the other of said die blocks to pivot in the same plane as said blocks, said clamp having slots on opposite sides of said pivoting means, each of said slots being adapted to receive a corresponding bolt, and wing nuts for securing said bolts in said slots.

11. A tube flaring tool comprising:

(a) a yoke having a feeding axis,

(b) a flaring cone member, having a flaring head,

(0) means for feeding said cone member axially of said yoke,

(d) clamping means supported on said yoke for holding a tube in flaring position,

(e) an externally threaded annular means formed on said cone member between said yoke and said flaring head,

(f) a flange stop member mounted on said yoke and threadedly engaging said annular means,

(g) an internally threaded collar threadedly engaging said annular means between said stop member and said flaring head,

(h) graduations around the periphery of said collar representing various thicknesses of tubes to be flared,

(i) a stationary indicating mark on said cone member for registering with said graduations, and

(j) said graduations being related to the threads of said collar so that when a graduation representing a tube thickness registers with said indicating mark and said collar engages said stop member, said flaring head is adapted to engage a tube having said tube thickness in said flaring position.

12. The invention according to claim 11 in which means are provided for limiting the rotation of said collar to less than 360.

13. A tube flaring tool comprising:

(a) a yoke member,

(b) a flaring spindle including a shaft,

(c) means for journaling said shaft in said yoke member for rotary movement about the longitudinal axis of said spindle,

(d) means for rotating said shaft,

(e) means for feeding said spindle axially of said yoke member,

(f) a roller,

(g) means on said feeding means for rotatably supporting said roller in rolling engagement with said spindle, and

(h) clutch means for engaging said roller to actuate said feeding means.

14. The invention according to claim 13 in which said spindle comprises a flaring cone for rolling engagement with said roller.

15. The invention according to claim 13 in which said roller is conical.

16. A tube flaring tool comprising:

(a) a yoke havng a feeding axis,

(b) a flaring cone member,

(c) means for feeding said cone member axially of said yoke,

(d) clamping means for holding a tube to be flared by said cone member,

(e) parallel posts fixed to said clamping means,

(f) means in said yoke for slidably receiving said posts axially of said yoke, and

(g) latch means for locking said posts in selected axial positions in said yoke.

17. The invention according to claim 16 in which said latch means comprises a latch arm pivotally mounted on said yoke about the axis of said shaft, the extremities of said arm comprising oppositely disposed recesses, said posts comprising spaced grooves adapted to receive said recesses when said latch arm is pivoted to locked position.

References Cited by the Examiner UNITED STATES PATENTS 1,752,508 4/30 Schultis 15381 2,711,773 6/55 Wilson 15381 2,737,225 3/56 Jasinski 15381 CHARLES W. LANHAM, Primary Examiner.

MICHAEL V. BRINDISI, Examiner.

Claims

1. A TUBE FLARING TOOL COMPRISING: (A) A YOKE, (B) A SLEEVE ROTATABLY MOUNTED IN SAID YOKE, (C) A SHAFT EXTENDINT THROUGH AND ROTATABLY JOURNALED IN SAID SLEEVE, (D) A FLARING CONE FIXED TO ONE END OF SAID SHAFT, (E) MEANS FOR ROTATING SAID SHAFT IN SAID SLEEVE, (F) A ROLLER, (G) MEANS ON SAID SLEEVE FOR ROTATBLY SUPPORTING SAID ROLLER IN ROLLING ENGAGEMENT WITH SAID CONE, (H) THREADED FEED MEANS CONNECTING SAID SLEEVE AND SAID YOKE OPERABLE TO MOVE SAID SLEEVE RELATIVE TO SAID YOKE, AND (I) ANNULAR MEANS SUPPORTED ON SAID YOKE FOR ENGAGING SAID ROLLER TO TANSMIT THE ROTARY MOVEMENT OF SAID CONE TO OPERATE SAID FEED MEANS.