US1085762A

US1085762A - Self-opening die.

Info

Publication number: US1085762A
Application number: US73150512A
Authority: US
Inventors: Oscar A Smith
Original assignee: NAT ACME Manufacturing CO
Current assignee: NATIONAL-ACME MANUFACTURING Co; NAT ACME Manufacturing CO
Priority date: 1912-11-15
Filing date: 1912-11-15
Publication date: 1914-02-03
Anticipated expiration: 1931-02-03

Description

0. A; SMITH. SELF OPENING DIE.

APPLICATION FILED NOV.15, 1912 1 085 762 I Patented Feb. 3, 1914 2 SHEETS-SHEET 1.

QXMimeoacs: 66 a 1 anuclflfoz 0.5112024. SmiZ/z.

0. A. SMITH.

SELF OPENING DIE. 7 APPLICATION FILED NOV. 151912.

' Patefit'ed Feb. 3, 1914.

'1 2 SHEETS-SHEET 2.

qmiihaaocs & 'wwww UNITED STATES ATENT @Fhlfi'hl.

USGAB 3. SMITH, F CLEVELAND, OHIO, ASSTGNOR TO 'THE NATIONAL-ACME MANU- I FACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO- SELF-OPENING DIE.

To all whom it one 1 concern: I Be it lmmv-n that I, Oscaa A. Sirrr-H. a citizen of the United States, residing at Gleveland, in the county of Cuyahoga and State of Ohio have invented certain new and useful l-mprov-emelrts in eli-Opening Dies. of which the following is a specification. A

' This invention relates to improvements in $0 ill reading (lies of the character known as .aelflopening d-ies,}tl ie object of the invention being to provide a die which will allow a thread to be cut to the shortest length practicable in any desired apitch without the for ward travel of the chasers when opening and which will insure the opening of thechasers instantaneously instead of gradually and thus avoid the mailing of a larger or tapered threa-dat the extreme end of the out, and in wh-ioh the die may be set or closed without any appreciable wear or friction on the cam '01- surfaces of the chasers or cutter blades.

A further object of the invention is the provision of a die having iln roved means ,for allowing an eccentric 0r -oa-ting movement. of the body relatively to the casing and to obtain this without the use of springs.

In the drawings aecmnpa-nying and for.m ing part of this specification, Figure 1 a perspective view of the improved die; Fig. 2 is a front end view thereof with the front cap partly removed; Fig. 3 is a cross-sectional view of the die with the chasers closed ior in their threading position; Fig. 4 is a view similar to that of Fig. 3-, but illu trating the chaser operating cam member in that position which permits the chasers to open; Fig. is a partly sectional perspeclive view of, the front cap; Fig. (i is a perspective view of the die body; Fig. 7 a perspective view of the chaseroperating cam member or disk; Fig. 8 is a perspective view of the die 'asing; Fig. 9 is a perspective view of the floating or eccentric coinpensating ring; Fig. 10 is a perspective view of the flanged shank or spindle by means of which the die is attached to the machine and also a view of the rear cap or ring for holding the floating ring shown in Fig. 9 and the flanged stein shown in Fig. 10 assembled; Fig. 11 is a perspective view of the die chaser and its guidii'ig' block or plate; Fig. 12 is a detail View of a part of the it chaser operating cam member; Figs. 13' and of the drawings.

Specification of 'IiettersTatciit.

Application filed November 1-5, 1912. Serial 11%. 731,505.

(Patented Feb. 3, I914.

l4 show difl erent positions of the die chasers and the-cam operating member in the :operation of the die; Fig. 15 is a detail 'view of one of the screws used for holding certain parts of the die assembled; and- Fig. 16 a seot-iorml view taken in line 16-16, Fig. 2.

Similar characters ef reference indicate corresponding parts' th-roughout the figures 6'5 The =l7l-Il'BQCl1HQ-t00l in the preferred embodiment thereotf shown, comprises a the body having a reeirward'ly extending hollow or cylindricalshaii'k portion 3, and this die bodyfis provided with a plurality of four guidew'ays 4c, 5, 6 and 7 extending ra- -dially thereof. The rear portions of these ways are grooved or undercut to form laterally extending recesses 8, and in each of the ways slides a die chaser or cutter 9, see Fig. 1l,--secured tea plate orblock 9 which projects beyond the two side faces of the chaser and into its recesses -8. By means :of this construction the chaser-s are guided in their opening and closing movements and are maintained against 'depthwise movement axially of the die. Each of thesef ol-iasei." gi-iiding blocks 5) is provided with-projecting pins 10 in position to engage coil springs 11 loeated in openings 12 of the die body on 5 each side of the die 'chasers. These springs are effective to shift the olaasers outwardly from the axis of the body. On one corner of the outer end of each of the plates '9 is formed a tapered cani projection l-i for the purpose hereinafter explained. Each plate 9 has a locating pin to fit in an opening 13 of its chaser. The outer end of each chaser is tapered circ-umterentially throughout the major portion thereof,- that is. itzis tapered transversely or at a right angle to the axis of the die, at 28, but this tapered Surface is straight axially, that is parallel with the axis of the die. In the rear of this tapered surface 28 the chaser is stepped, as at 28', a predetermined depth lower than the surface 28,' and this surface 28 is also straight axially of the die, such stepped surface having a square shoulder.

For closing the (lie Chasers suitable means In is provided, herein designated as'the die chaser operating means or member, or cam disk. and consists of an axially bored disk 16 having forwardly extending arms 17 squared on their outer ends or faces, as at of each arm. The shank portion 3 of the L die body extends through the bore of this cam disk 16. 'Encircling this disk 16 and its forwardly extending arms 17 is the die casing 19, which is also centrally bored to receive the shank 3 of the die body. Over the front edge of this casing 19 and secured to the die body is a front axially bored cap 20. For holding the die body, the chaser operating cam disk and casing19 in proper assembled position relatively one to another, thereby to permit proper movement of the chaser operating cam disk relatively to the chasers, the die body is provided with a pair of countersunk openings 21, the shoulders of which are engaged 'by the heads of screws 22, see Fig. 15, which project through the openings 21. The inner end of each of the openings 21 of the die body is counter-bored.

by means of slots 16 provided in the disk 16, and through which .slots 16 the smoothed ends of the screws 22 project so that the disk 16 is prevented from movement axially of the die. vIn other words,

when the screws 22 are turned into the rear" wall of the casing 19 the distance from the inner sides of the washers 21 to the threaded portions of the screws 22 is just enough longer to allow the cam disk to rotate while preventing movement thereof in the direc tion of the axis of the die.

For adjnsting the chasers toward and from the work a suitable micrometer screw 31 is provided extending diagonally through the die casing 19 and held in any desired adjustment by a clamp washer and screw 38' housed in the periphery of the casing 19. On the rear wall of the cam disk 16 is astud or pin 31 so placed as to come into contact with the micrometer screw 31. In the rear wall of the casing is milled an elongated curved groove to receive this stud 31 and a vcoil spring 40. The pressure of the spring 40 against stud post 81 of the cam dislfa16 forces this cam disk 16 against its adjusting screw 31', or in other words holds the cam disk in whatever position it is adjusted to by the micrometer screw, that is to say, when .the micrometer screw is op erated it will turn the cam disk and so carry its stud 31 a predetermined distance in the elongated groove and hold it there, so that when the cam disk is rotated away from the end of the micrometer screw and released it canreturn only as far as the end of the screw. A. handle 30 passes through an elongated slot in the periphery of the casing 19 and is screwed into the cam operating disk 16. A. pin 24 is fastened to the shank 3 of the die body 2 a suitable distance from the outer side of the rear wall of such body and the disk portion of the cam disk .16 has a recessed and tapered cam portion 21 in position to engage this pin 2 L of the die body shank 3 at a predetermined time when the cam disk 16 is rotated.

:To set the die the handle 30 is rotated to the right from the position shown in Fig. 13, thus bringing the tapered edges 18, seeFig. 7, of the arms 17 of the cam disk 16 into engagement with the projecting cam portions 14 of the chaser plates 9, which action forces the chasers inward. By reason. of the fact that the cam portions 14 of the plates 9 are relativelyhigh, the movement of the chasers inward is sufficient to clear the outer ends or surfaces 28 of the chasers from the forward ends of the arms 17, so that the chaser surfaces 28 by this movement of the cam disk are carried inward and therefore away from the forward ends'of the armsl'l' of the cam disk 16. This movement of the handle to the right carries the cam disk 16 into position to-bring the cam portion 24 thereof into contact with the pin 24' on the die body comes into contact with this pin 24: it will of course draw back the die body and the chasers carried thereby into the 'casing 19 and so bring an extremely small portion of the rear edges 28 of the chasers under the extreme outer ends of the arms 17 of the cam disk, whereupon, on releasing the handle, the spring 40 returns the cam disk automatically to its original position to which it has been adjusted by the micrometer screw. In Fig. 14 the full line position of the handle 30 and the arm 17 shows such arm 17 returning to its set position to the left, which is indicated by the dotted position of the handle 30, during which returning movement, by reason of the fact that the die body and the chasers have been drawn back in the manner just stated, the outer ends of the arms 17 merely shift circumferentially over -the tops of the surfaces 28 of the chasers and hold them in their set position. As the surfaces 28 are straight axially, that is.

the chasers are spaced from the extreme.

outer ends of the cam disk arms 17 and during this movement the coiiperation of the pin 24 and tapered cam surface 2e draws the die body with its chasers backward into the casing and thus draws the rear outer ends of the chaser surfaces 28 under the-extreme outer ends of the arms 17. In other words, when the tapered surfaces 18 of the arms 17 of the camdislt are shifted by means of the handle into engagement with the surfaces 14- the chasers are shifted toward theaxis of the die to a greater extent than is neces sary, so that when the die body is drawn back :in the manner described the outer ends under the extreme outer ends of the arms 1 the tapered surfaces 28 of such chaser outer ends controlling. in connection with the micrometer screw, the particular setting oi' the dhasers to cut the desired thread. lY-heu the shank '32 and the -asiug 19 'to which it is attached has been arrested during its forward travel in the usual manner the-cmit-inued forward 'trave'l'of the die body a very slight distance of course pulls the chaser surfaces 28 from under the extreme outer ends 1T of the arms 17 of the cam disk 16. so that without the further forward travel of the chasers themselves independently of the body, and by means of the straight stepped drop at the rear of the tapered surfaces .28 of the chasers. the chasers are instantaneously released from the forward ends of the arms 17. By operating the micrometer screw out or in the cam disk is rotated forward or backward, thus adjusting the chasers to the desired depth of cut. as hereinbefore explained.

The floating or eccentric compensating mechanism is constructed as follows: The rear of the casing 19 is bored to Form a chamber to receive a disk 29, the diameter of which is machined to a predetermined size smaller than the bore of the casing. In the edges of this disk are located four angula'r recesses '38 equally spaced. Fitted to slide in two oppositely located recesses are squared studs 37 carried by the wall of the chamber. The flange or disk of the stem 32 by means of which the die is secured in the machine or turret head also has two square studs 36 located in such position as to fit into the two remaining recesses of the disk 29. The diameter of the flange of this stem 32 is also machined smaller than the bore of the chamber a predetermined size. \Vhen these parts are assembled in the chamber or bore of the casing 19) they are held in place by a ring 34, which is bored to slip over the stem 32 and fastened to casing 19 by suitable screws. The difference in diameter between the disk 2-9 and the flange of stem and the diameter of the bore or chamber of the casing 19 determines the. amount of eccentric or floating movementthe die will have, by reason of the fact that the pins fit loosely in the slots.

From the: foregoing it will be observed that the chasers are closed-by rotating the chaser closing in-ea nslinstead of shifting it or surfaces of the chasers will be drawn axially, and that during this rotation of the chaser closing means the notch 2% comes into position to engage the pin 2-1;, so that the inclined or tapered face of this notch 24 engages the, pin and draws back the body carrying the Chasers and so brings the ends of the chasers under the ends of the forwardly projecting arms 17 of the cam disk and holds them in their set position, this being done without an Y appreciable friction or wear on the ends of the chasers or cam for operating them. \Vhen the die has. been properly fed forward until the usual stop, not shown limits the further forward movement of the die casing and stem 32 the further pull on the chasers pulls the body forward an extremely small distance, releases the outer ends of the chasers from the ends of the projecting arms and allows them to open in the usual manner, without any forward movement of the chasers independently ofthe die body, so that the chasers will instantaneously fly open. This is an advantage of extreme importance over that form of die where the ends of the arms 17 are tapered, or where the outer ends of the chasers are tapered in the direction of the axis of the die, for in such a construction the chasers had to be pulled continuously forward a sufficient distance to permit them to be opened and there was therefore a gradual opening of the chaser-s, which had a tendency to out a larger tapered thread at the extreme end of the threaded port-ion, whereas in the present case the chasers open instantaneously and thus eliminate this dis advantage.

,Among the advantages of the present const ructiol-i' are the following: Thatwhen the chasers are being set there is no wear on the ends of the chaser-s, and the wear on the outer ends of the chasers or surfaces 28 and the ends of the arms when the die opens or releases is very slight compared with that wear which takes place in the set-ting of the die chaser-s. Fllltllfill'llOle, the chascrs ha ving no forward movement themselves when opening, it follows that the die can cut very short threads, as the chasers practically instantaneously open. Further. the grooved means for obtaining an eccentric compcm sating or floating movement is more universal and better, as it does not depend on V partcomprising the die body and the chasers, the rear of which die body is in engagement with the front face of the cam disk 16 \vlIe-nthe chasers are set and spaced there- 1. A threading die comprising a fixed part and a movable die body, shiftable thread cutting means carried by the body, and die set-ting means effective to shift the cutting means and including means effective to draw the die body toward the fixed part thereby to finally set the thread cutting means.

A threading die comprisin a fixed part and a movable die body, shi table thread cutting means carried by the body, and rotary die setting means effective on the rotation thereof to shift the cutting means and including positively actingmeans effective to draw the die body toivard the-fixed part thereby to finally set the thread cutting means.

3. A threading die comprising a fixed part and a movable die body, shiftable thread cutting means carried by the body, and die setting means effective to shift the cutting means and including cam formed means effective to draw the die body toward the fixed part thereby to finally set the thread cutting means.

42. A threading die comprising a fixed part and a movable die body, shiftable thread cutting means carried by the body, die setting means e fective to shift the cutting means and inciuding positively acting means carried by the d ie and effective to draw the body toward the fixed part, and means for bringing said positively acting means into engagement whereby the thread cutting means will be finally set on the d 'avving of the (lie body toward its fixed part.

5. A threading die comprising a fixed partand a movable die body, shiftable thread cutting means carried by the body, die setting means effective to shift the cutting means and including cam formed members effective to draw the die body toward the .fixed part, and means for bringing ,-aicl'can1 formed members into engagement whereby the thread cutting means willbe finally set on the drawing ofthe die body toward the fixed part.

'6. A threading die comprising a fixed'part and a movable die body, shiftable thread cutting means carried by the body, and die setting means effective to shift the cutting means and including rotatable 'means carried by the fixed part and having means co operating with a part of the body to draw said body part thereby to finally set the thread cutting means. 7. threading die'ccmprising a part and a movable die body, shiftable thread cut ting means crried by the body, and die setof said"inen1ber to shift the cutting me ting means effective to shift the cutting means and including rotatable means ried by the fixed part and having positively acting means cooperating with a part of the body to draw said body toward the fixed part thereby to finally set the thread cutting means.

8. A threading die comprising a. fixed part and a movable die body, shiftable thread cutting means carried by the body, and die setting means effective to shift the cutting means and including rotatable means carried by the fixed part and carrying cam formed means cooperating With a part of the body thereby to draw the body toward the fixed part and finally set the thread cutting means.

9. A threading die comprising a fixed part, a body axially movable relatively thereto, shiftable thread cutting members carried by said body and each having a cam sur face extending at an angle to the axis of the die and a stepped end having a part thereof parallel with the axis of the die, said cam surface projecting beyond said parallel surface, a rotatable member carried by said fixed part and effective to engage said cam surface and shift the cutting members in.- ivardly, and positively acting means carried by the body and rotatable member wherein on the rotation of said member to shift the cutting members inwardly the oie body will be drawn toward the fixed part thereby to bring the parallel surfaces of the cutting members under the rotatable member to such cutting members.

10. A threading die comprising; a casing, a

body axially movable therein shiftablethread cutting members carried by said body and each having a cam surface extending at an angle to the axid of the die and a stepped end having a part thereof parallel with the axis of the die, said cam surface projecting beyond said parallel surface, a rotatable member carried within the casing and eft'ec tivejto engage said cam surface and shiftthe cutting members inwardly, and positively acting means carried by the body and rotatable member whereby on the rot inwardly the die body will be drawn within the casing thereby to bring the arallel surfaces of the cutting members un er the rotatable men iber to set such cutting members.

11. A threading die comprising a fixed part, a. body axially movable relatively thereto, sbiftable thread cutting members carried by said body and each having a cam surface extending at an angle to the axis of the die and a stepped end having a part thereof parallel with the axis of the die, said cam surface projecting; beyond said parallel surface, a rotatable member carried by said fixed part and effective to engage said cam surface and shift the" cutting members in= Wardly, and positively acting means comprising a pin and a recessed cam surface carfied by the body and rotatable member whereby on the rotation of said member to shiftthe cutting members inwardly the die bod will be drawn toward the fixed part thereby to bring the parallel surfaces of the cutting members under the rotatable membet to set such cutting members. I

12. A threading'die comprising a casing, a die body, a plurality of chasers shiftably supported by said die body, each of said chasers having a surface tapered at right angles to the axis of the die and parallel with the axis of the die and also having a stepped surface in the rear thereof and. in the rear of said stepped surface a cam surface projecting beyond such parallel surface, and a rotatable member within the easing having a plurality of parts each to engage one of said cam surfaces. and shift the chasers toward the axis of the die andbeyond their set positions, said rotatable memher and body having means for then drawing one of said parts toward the other to have the other of said parts of said rotatable member engage the parallel surfaces of the chassis.

13. A threading die comprising a casing, a diebody, a plurality of chasers shift-ably supported by said die body, each of said cha'sers having a surface tapered at right angles to the axis of the die and parallel with the axis of the die and also having a stepped surface in the rear thereof and in the rear of'said stepped surface a cam surface projecting beyond said parallel surface, and a rotatable member within the casing having a plurality of forwardly projectingarms corresponding in number with the number of chasers, each of said arms having a surface to engage one of said cam surfaces and shift the chasers toward the axis of the die and beyond their set positions, said rotatable member and body having means for then drawing one of said parts toward the other to have the ends of saidarms engage the parallel surfaces of the chasers.

'14. A shiftable thread cutting members carried by said body, a rotatable member having a part cooperating with said thread cutting members and a part cooperating with said body,

and means for rotating said member there- 55 by to shift .the cutting members inwardly and then draw the same with the body and said rotatable member one axially toward the other and into engagement thereby to set the cutting members.

15. A threading dic including an axially movable body, shiftable thread cutting mem-' bers carried by said blidy, arotatable member having a part cooperating with said thread cutting members and a positively ac ing part cooperating with a part of said body,

threading die including a body,

and means for rotating said member thereby to shift the cutting members inwardly and then draw the same Witht'he body axially into engagement with said'rotatable member thereby to set the cutting members.

16. A threading die including an axially movable body, shiftable thread cutting members carried said body and having a cam surface extending at an angle to the axis of the body and a surface parallel with'the axis of the body and beyond which said cairn surface extends, a, rotatable member having a part co iperating. with said cam surface and a cam surface coiiperating with a part of the body, and means for rotating said member therebyto shift the cutting members iiiwardly and then draw the same with the body axially of said cutting members into engagement to bring the parallel surfaces M with said rotatable member thereby to set i the cutting members.

17. A threading die including an axially movable body, shiftable thread cutting members carried by said body, a rotatable member having a part cooperating with thread cutting members and a part cooper-at ing with said body, and means for rotating Said member thereby to shift the cutting members inwardly beyond their set position and simultaneously shifting the same With the body axially of the die and thereby effect engagement thereof with the cutting members on the return of such cutting members to their set position.

18. A threading die including an axially p movable body, shiftable thread cutting mem bers carried by said body, a rotatable nie'mber having apart cooperating withisaid thread cutting members and a part cooperating with said body, means for rotating said member thereby to shift the cutting mem bers inwardly beyond their set POSltlOIlfllld simultaneously shifting the same with't-he body axially of the die and thereby effect engagement thereof with the cutting mem bers on the return of such cutting members to their set position, and means for adjusting the rotatable member circumferentially.

19. A threading die comprising a casing, a die body, a plurality of chasers shiftably supported by said die body, chasers having a surface tapered at right angles to the axis of the die and parallel with the axis of the die and also having a stepped surface inthe rear thereof and in the rear of said stepped surface a cam sur face projecting beyond such parallel surface, a rotatable member within the casing having a plurality of parts each to engageone of said cam surfaces and shift the chassis to Ward the axis of the-die and beyond their set' positions, said rotatable member and body having means for then drawing one of said parts toward the other to have other each of said parts of said rotatable member engage the parallel surfaces of the Chasers, and means for adjusting the rotatable member circumferentially.

20. A chaser for a die, having a cam surface extending in one direction and a stepped surface having a portion extending at an angle to said cam surface and parallel with the axis of the die, the cam surface projecting beyond said parallel surface.

21. A chaser for a die, having a stepped end provided with a surface parallel with the axis of the die and also having a cam surface located at an angle to said parallel surface, one of said surfaces projecting beyond another. I 1

.22. A chaser for a die having g a broad guide plate provided Witha cam surface, said chaser having a stepped end having a surface located at an angle to said cam surface and parallel with the aiiis of the die,

one: of said surfaces projecting beyond another.

23. A chaser for a (he, having a broad guide plate provided with a cam surface, said chaser having a stepped end having a surface located at an angle to said cam surface and parallel with the axis of the die, said cam surface projecting beyond said parallel-surface.

24;. A chaser for a die, having a separable broad guide plate secured to the back thereof and provided with a cam surface, said chaser having a stepped end provided with 'a surface at an angle to said cam surface and parallel with the axis of the die, one of said surfaces projecting beyond another.

'25. A chaser for a die, having a separable broad guide plate secured to the back thereof and provided with a cam surface, said chaser having a stepped end provided with a surface at an angle to said cam surface and parallel with the axis of the die, said cam surface extending beyond said parallel surface.

26. A chaser for a die, having a separable I broad guide plate secured tothe back thereof and provided with a cam surface. said chaser having a stepped end provided with a surface at an angle to said cam surface and parallel with the axis of the die, said cam surface extending beyond said parallel surface and said cam surface being located at one corner ofsaid plate.

27. A chaser for a die, comprising a plate having at one corner a cam surface, the chaser having a surface located below and at an angle to said cam surface and parallel with the axis of the die.

- 28. A chaser for a die, having a guide plate provided with a cam surface at one corner thereof, the chaser having a stepped end provided'Wit-h a surface located at an t emes the axis' of the die, said cam surface projecting beyond said parallel surface.

29. A threading die comprising abodyz chamber and provided with a pair of integral squared studs for insertion into another pair of said angular recesses of the disk, and means for securing said parts together. I

30. A threading die comprising a .body

and a casing, said casing having a chamber at its rear, a pair of disks located within said chamberand of predetermined smaller size than said chamber, said disks and chamber wall having coiiperating angular recesses and integral squared studs, and means for securing said parts together and supporting means carrying one of said disks.

31. A threading die comprising a body and a casing, said casing having a chamber at its rear, a pair of disks located within said chamber and of predetermined smaller size than said chamber, said disks and chamller wall having cchperating angularrecesses and. integral squared studs, all of the re cesses being carried by one of said members and the studs by the other two members, means for securing said parts together, and supporting means carrying one of said ;disks.

82. A threading die comprising a body and a casing, said casing having a chamber at its rear, a pair of disks located Within said chamber and of predetermined smaller size than'said chamber, said disks and chamber wall having coiiperating angular recesses and integral squared studs, all of the recesses being carried by that disk which is located,

securing said parts together, and supporting.

ieans carrying one of said disks.

A threading die comprising a casing a body, shiftable chasers carried by the body, a rotatable member carried by the easing for setting said chasers, a pin carried by the rotatable member, a spring carried by the casing for engaging one side of said pin, and a micrometer screw for engaging the opposite side of and adjusting said pin and thereby adjusting said rotatable member to compress said spring, the spring holding the pin in engagement with the micrometer screw.

34. A threading die comprising a casing and a body, shiftable chasers carried by the body, a rotatable member carried by the easing for setting said chasers, a pin carried by the rotatable member, a coiled spring carried by the casing for engaging said pin. and a micrometer screw for adjusting said pin and thereby said rotatable member to compress said spring, said pin extending rearwardly of said rotatable member and said casing having in its rear wall an elongated curved slot for the reception of said spring and into which slot said pin projects.

35. A threading die. comprising a fixed part and a movable (lie. body, shiftable thread cutting means carried by the body, rotary means effective to shift the thread cutting means toward the axis of the die, and means effective to draw the die body toward the fixed part thereby to hold the thread cutting means in its operative position.

36. A threading die comprising a fixed part and a movable die body, shiftable thread cutting means carried by the body, rotary means efi'ective to shift the thread cutting means toward the axis of the die, and means effective to draw the die body toward the fixed part thereby to hold the .thread cutting means in its operative position, said rotary means and thread cutting means having c0- operating cam surfaces.

37. A threading die comprising a fixed part and a movable die body, shiftable thread cutting means carried by the body,

rotary means eli'ective to shift the thread cutting means toward the axis of the die during the rotation thereof in one direction, and means efi'ectivcjto draw the die body toward the fixed part during the rotation of said rotary means in the opposite direction thereby to hold the thread cutting means in its operative position.

:38. A threading die comprising a die body, a casing for said body having a rear wall, a flanged spindle, and a coupling disk interposed lietn'eeirtlle spindle flange and the rear wall of Said casing, said rear wall, spindle flange and interposed disk Inn-iii?! interlocking portions rotatably connecting them.

Signed at Cleveland, Ohio, this 12th day of November. 1912.

USCAR bMlTH.v Witnesses Part, E. RYAN. 5, J OHN B. BLUE-l; f lm;