US1038670A

US1038670A - Threading-die.

Info

Publication number: US1038670A
Application number: US617?3411A
Authority: US
Inventors: Oscar A Smith
Original assignee: NAT ACME Manufacturing CO
Current assignee: NATIONAL-ACME MANUFACTURING Co; NAT ACME Manufacturing CO
Publication date: 1912-09-17
Anticipated expiration: 1929-09-17

Description

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-UN ITED STATES PATENT. OFFICE.

oscsaa. sm'rn, or omvntsnn, x10, assumes. we was NATIONAL-ACME manurac'ronmo comm, or onsvnnsnn, care, A oonrom'rron or 01110.

rmanmmnm specification of Letters Patent.

Patented Sept. 17,1012.

To all whom. it may concern:

Be it known that I Osoaa A. Stirru citizen of the Unite States, residing at Cleveland, inthe county of Cuyahoga and State of Ohio,'have invented certain new and useful Improvements .in Threading- Dies, of which the following is a specification.

This invention relates to threading dies of the character known as opening or selfopcning dies, the object of the invention being to provide an improved tool of this character simple in construction and easily operated, and in the use of which there will be no variation in the thread during the operation of the die by reason of the fact that the construction is such that it is impossible for the die chasers to open while a thread is being cut even thou h the die chaser operating means should 0 slightly shifted and in which also the die wil out the full len th of the stock.

In thrca in tools as usually constructed the die chaser locks, or the means for closing them, are provided with tapered surfaces extending .depthwise of the tool, in consequence of which any slight movement of the die chaser operating means ermits the opening of the die chasers an consequeut y a variation in the thread cut, thus materially interferin with the proper action of the tool, am one of the objects of the present improvement is to avoid this defect in threading dies of this elassand also to avoid the necessity of moving the, dies in the direction of the axis of the die in Orvder to open such dies.

In the drawings accompanyin and forming part of this specitication, I igure -1.is. a front end view, partly brokenawn ..-and paltl m seetiou,-o-this improved read! mg to; Fig. 2 .is a cross-sectional view thereof taken-on the line 2-2-2, F ig. 1; Fig :i is a similar cross sectional view of a art; of the threading tool shown in Fig. 2 i lus-' trating the open position of hue ot;tl\e die rhascrs; Fig. an a detail -;view' illustratingthe means for adjusting';'the die-.chasers; Fig. is a;perspective, view1ef the die body; Fig. tl-is aersp ti,ve viewppartly. insecs, tion, of theff' ie headi Fig. ,-7;;1sip perspeptivm view of the. die .bleck operating-means or. com Fi 81 is a, perspective 4 memo! .Lthtn end cap oa-the too rigtn isgadetailzviewt of the micrometer adjusting means for the die chaser blocks; and Fig. is a detail view illustrating one of the die chasers, its block and one of the spring-actuated devices for opening the die chasers.

Similar characters of reference indicate corresponding parts throughout the figures of the drawin The threading tool, in the preferred embodiment herein shown and described, comprises a die body 2 havin an axial bore and a plurality, as four, ui es or ways 3. 4, 5 and 6 extending radially of the die body. The rear portions of these ways are undercut, as shown at 7, Fig. 5, to form recesses or grooves. In these ways slide die carriers or locks 8, see Fig. 10, having lateral extensions 9 and 10 which slide in the recesses or grooves 7, by which construction the blocks are guided in their opening and closing movements and are maintained against. depthwise movement. Each of these b ocksis provided with projectin pins 11. in position to engage a. heade pin or piunger 12 pressed outward by a coil spring 18, each pin and s ring being located in an o ening 4 in the ie body, one at each side 0? the is block. These springs are effective to shift the die blocks outwardly from the axis of the body.

In each of the die blocks is secured a die or die chaser 15; it being secured therein by a screw 16. The die blocks are shown as of U-shaped form for the reception of such die chasers. The outer end of each die block is tapered circumferentially throughout the major portion thereof, as M117, and at the rear outer end thereof is also tapered de thwise of the tool as at 18. -Fo r.elo'sing tie die chasers suitable means .is provided, herein designated as the die .ehaser or die. chaser block operatin means or member and consists of an axially ored disk 10 having forwardly extending projections or arms preferably tapered on their under forward edges, as at 21, whereby they will eotiperatemore easily with the depthwise tapered surfaces -;18 of the chaser blocks. .Encirclingthis 'disk and its forwardly ex- -te nding.arms20 is the die head 22 having the usual collaror groove 28 by means of -which'thehead is shifted do thwise or back andforth-relativelg to the ie body. This ..collar -28 isguide by the rearwardly. ex-

- maintains tending shank forming patio: the core or body and which projects beyond such collar topermit to and fro movement of the collar to 0 en and close th'e'dies, suelishank forming he means for'attaching the dies to the l0ltlin% means or chuck so that the die body and lo chascrs are held stationary. against independent movement in the direo tion of the axis of the die. For iimitin the rearward movement of the die head suitable devices are provided shown as "a pair of screws 24 pro ecting t rough open mgs in the die body and assing' through elongated slots 25 in the isk 19 and into threaded openings in'the rear or back wall of the die head. These screws are pro vided with enlargements orheads' 26 adapted to en age-the outer end of a sleeve 27 located in t is countersunk bores or open-' ings of the die bod through which the screws pass, the hen s 26 of which screws thus limit the rearward movement of the die head. The sleeves 27 have the heads 28 thereof in engagement with the forward side of the chaser o eratin means or disk 10, whereb this dis and t e die head are in operative enga ement for simultaneous movement forwar and back-' ward.

For adjusting the chasers toward and from the work a suitable micrometer screw is provided extending diagonall through t 1e head, and this screw is provide with a portion of less diameter, as 80, for the reception of the bifurcated end of a stud, as 81, see Fig. 7, which stud iscarried' by the disk 19, so that on the adjustment of this screw it will oscillate or rotate the disk 19 relatively to and independently of the head in one direction or the other according to the direction in which the adjusting screw is turned, and so adjust the chasers relatively to the work 'by reason of the-fact that, the forwardly projecting arms of the disk 10 are, as'hereinbefore 'stated,in engage-' ment with the "circumterentially tapered portions of the chaser blocks,-this' taper be mg transverse to theaxis' of 'the' 'tooh-"the major ortion of the outer end of thecha'ser block owever, beinga' straight surface in the direction of the axis 0 'thVtool, or dept-hwise of the block. In other words it is not tapered in the directionlofthe axis of the tool except at its rear side isothat when the chascrs are closed'by'the' torward movement of the head and the ehaser'block closing means the arms of the'riatterare in engagement with the outer depthwise strai ht surfaces of a the chaser blog'ksya'ndthere ore no slight'shifting of the h sdand the'ehas'er forward-or backward dlrection will permitgaiiye n oye meat of the chaser 'bloekstan'd' 'the ,ehasers carried-thereby, while-ii fosdillatingthedisk- 19 by. means of the {tin crome terwerew the 1,osa,evo

chaser blocks will beadjusled in the mannor stated. Or, to mt it in other language the outer ends of tlie chaser blocks are ta 'ered transversely to the'axis oi the tool y reason of which taper the chaser blocks and thereby the chnsers may be lttlllln'lt'tl on swinging 0r oscillating the arms oil the (link 19 bymeans of the micrometer screw, but as the outer ends of these blocks are straight depthwise throughout the major portion thereof it follows that when the tool is at work no slight movement of the disk 19 or the head carrying the same forward or backward will permit any movement of the .ohaser blocks or chasers carried thereby, @since the arms at this time have passed be- {yond or forward of the tapered surfaces 18 and are in engagement with the dcpthwisc strnight surfaces of the blocks, whereas heretofore it has been the usual iractice to :have the outer ends of the bloc (s tapered in the direction of the axis of the tool, or depthwise so that any slight movement oi :the head backward or forward would al feet the position of the chasers and result in .a variation in the thread being eat. It will thus be seen that the outer ends of the die chaser blocks are ta )ercd in two directions one transversely re ativcly to the axis of the tool and the other dep'thwise of the tool, but that the latter tapered surface is at the rear side of the block, so that when the chasers have been completely closed the arms of' the operating means or disk 10 have gassed awayifrom or are forward of the g epthwisetapered surfaces of the blocks and conseqaentl there is no opportunity for Ithe chasers to s lift fromtheir proper posi- Etions should the head he moved backward 101 forward other than in the proper manner .and by the means rovided for that pur- Ipose. The elongate slots 25 in the disk It), 'throu h which the screws 24 and sleeve 27 'exten permit this swingin or oscillating :movement ot the chaser bock operating means-or disk 10 inthe manner heremlwforc described: From the foregoing it will he -observed that the operating means for the chaser blocksthus has a-bacl ward and forwa'rd'movementfor opening or closing the chaser blocks, so that the die chasera are istationary at all times that is have no movement whatsoever in the direction of the axis lot the die, and'also-a movement in a direction transverse thereto, or as hereinhotore described an oscillatin or swingingmoregment for positioning t \e chaser blocks and thereby the chnsers relatively to the work to-be' operated u on, the latter movement he- ,in 'eflected byitie-micrometerscrew herein 'be ore referreditogior by any other suitable means whielr ivmayibe desired-to use, while "the'tcrmer is atieeted hythe shifting ot the ';head backward and forward by the means usually-'provided-' for this purpose. 'lhua,

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each diejaw or chaser block is provided with a pair-of cam or tapered surfaces located at right angles to eachother, one of which coo crates with the chaser closing means to 0 ose'and o n the-chasers while the other cooperates t iere'with to adjust-the positions of the chasers relatively t0' th0 work, asthe result of which if the dieor the head should move the least bitin cutting the chasers, however will alwayskee'p the same position-at-which they were set-until the die is-opened,sothatuntil thechaser block operating means or cam disk is'completely ulledolf from the'ends ofthe die chaser locks there can be no openingor closinrg of'the chasers on the work and consequent y the thread will not be made thicker at the end as heretofore.

In operation, when the head is moved forwart the cam operating disk 19 closes the die in a manner which will be readily understood from the fore oing and when the head is moved rearwar y or backwardly 3 the arms 20 are withdrawn from the outer ends of the die blocks, whereupon" the springs 18 ress the die blocksoutward so as to shift t is chasers outwardly'and'thercby open the die. The sprin actuated studs not only act to open the die looks, but also hold the same in enga ement with the arms of the disk when the utter are shifted forward to engage the outer ends of the blocks.

The front end of the die is covered with a cap 32, see Fig. 8, secured thereto by suitable screws and which cap is provided with a pair 0 openings 88 locuted in register with: the limiting screws 21, whereby the-movement of these screws-relatively to the 'die body as the head slides forward and backward is not interfered with. p

I claimaa my invention: a

1. The combination of a 'die body and shank said body having an axial bore and rovided with ways, members Provided with thread cutting-means movabe radially in said ways, means shiftable relativel to'said body and shank to'shift the three -cuttin members, means for shifting said means an beyond which the shank projectsfor attachment to its holdin means," and 'ineans for holding said;shifta le means andhitsrshift ing means in operative relation thereby to reventrcmatureindependent movement; of said sluftable means in any direction rela tively to said-thread-cuttin members. said' thread-cuttingmembers an shiftable means havingonena cam surface extendirig'in onedirection and one a camsurface: extending: in another direction whereby on .the operas tion zofa said ,f means win one 2 direction ass-i thread "cutting members will i be-cloeedand on the'lcpereftioniofsonei'ofsaid' tiieniberszing another-1 direction-the.gthreadcattingsrnem bers will be sdjusted=relatively;toithelworki -:2;1-'1he': combination: 01 fax-dies btaiy fand shank said body having an axial bore and provided with ways,-members having thread cutting means movable radially In said ways, each of said thread cutting members having a air of cam surfaces extending ill op site irections, shiftable means having a Orvvard and backward movement rela- .tivel to said body and shank and beyond whic the shank'projects for attachment to its holdinimeans for closing the thread cuttin me ers byzengagement'with one of sai cam'surfaces an also having a swing- I ing movement to adjust the thread cutting memberson the swinging ofsaid means relatively to-the other of said cam surfaces means for shifting said shiftable means, and means for holding said shiftablc means and its shifting means in o crative relation 'thereby to revent prema are independent movement 0? said shiftable means in any direction relatively to said thread-cutting tmembers.

8. The combination of a die body and shank-said body having an axial bore and provided with ways members having thread louttin means mova le radially in said ways, Eeach 0 said thread cutting members having is pair of cam surfaces extending in op 0- site directions shiftable means havin a orward and backward movement relatively to said body and shank and beyond which the shank projects for attachment to its holding means for closing the thread cuttin members by on agement with one of said cam surfaces an also having a swinging movement to adjust'the' thread cutting members on the'swingln of said means relatively to the other of sai cam surfaces means for swinging said operating means and comprising a micrometer screw, means for shifting said ,shiftable means, and means for holding said ishiftable means and its shifting means in operative relation thereby to prevent pro- :maturo independent movement of said shiftable means inany direction relatively to Zsaidthread-cutt-ing members.

4.1 The combination of a die body and shank said'body having an axial bore and iprovided with ways, members having thread lqutting me'ans movable :radially in said way'speach of said thread cut-ting members havin rat .its rear outer end' a cam surface exten ing defthwise thereof and havin in frontpthereo a strai ht surface extends :depthwise thereof an a cam surface (\Xiflllt ing vtransverscly pfsuch straight surface, sh ftable means having a forward-and backward' movement relatively to said body and shaxzlkiand abeyondqwhich. the shank project a a' folfaattachmenttoiits holdin means and a isw nging movernent and "e' ective to close 'f'the's thread-cutting means ou engagement flbiid'ftb'iiold them' a ainst movement on enf'gagement-withsuc straight surface and in as they. 'tran'sverselyirex eilectiveltoradjust the thread cutting members on-,theswingin thereof relativel to the transversely ex nding cam. sur ace, meansfor 'swin in the same, means for shiftin said shi tab e means backward and fcrwa .and means for holding said shiftable means and its shifting means in operative relation thereby to prevent premature independent movement of. said shiftable thread-cutting members. 1

-15. The. combination of a die body and shanksaid-body having an axial bore and provided with ways,me:nbers having thread cutting means movable radially in said ways, each of said thread cutting members havin at its rear outer end a cam surface exten ing de thwise thereof and havin in front thereo a strai htsurface exten dg depthwise thereof an a cam surface exten ing transversely of such straight. surface, shiftable means having a forward and backward movement relatively, to said body and shank and beyond which the shank projects for attachment to its holdin means and a swinging movement, and e active to close the thread cutting means on engagement with the desthwise extending cam surface and to hol such thread cutting means against movement on engagement with straight surface and effective to'adjust the thread cutting members on the swinging thereof relatively to the transversely extending cam surface, means for swinging the same, said shiftable meanscomprising'a disk having forwardly projecting arms, means com rising a headinclosing said disk and arms, or shifting said disk, and-means for holding said disk and its head in 'operai tive relation thereby to reventremature independent movement saiddisk in any direction relatively to said thread-cutting members. a

(l. The combination of a die body and shank said body having an axialbore and provided with ways, members havi thread cutting" means movable radially in said ways, each of said threaded cutting members havin at itsrear outer. end-a'camsurface tblilobackwurd movement relatively-to said body and shank and beyond which theshank'projects fornattachment toiyits holding means i and a swinging-movement; and effective: to

close theTthre'ad' cutting meanston engage- 00;.ment with the dcpthwise extendingcamisur face and toihold'lthema ainst movement on meme . n a meat with"'.such a mi htsurfaee audv ve'toradiust the thre'a cutting 00" themwmg nding '1 our means in any direction relatively to said exten ing defithwise thereof and :havin in means for swingin the same, means for shifti said shiftab e means backward and forwar means for holding said shiftable means and its shifting means in operative relation thereby to prevent premature indoendent movement of said shiftablc means m: any direction relatively to said threadcutting members and for limiting the backward movement thereof.

7. ,The combination of a die body and shank said body having an axial bore and srovided with ways, die blocks movable raially in said ways, each of said blocks having at its rear outer end a cam surface extending dcpthwise of the block and having in front thereof a strai ht surface extending dcpthwise of the blocii and a cam surface .extending transversely of such straight surface, means, comprising a disk havin forward] rejecting arms and a head inc osing said is and arms, and havin a forward and backward movement relatively to said bod and shank and beyond which the shank i pro sets for attachment to its holding means,

sai disk also having a swin ing movement and effective to close the ice on engngement with the dcpthwise extending cum surfaces and to hold them against movement on :ergsgement with such straight surfaces and such s ective to adjust the dies on the swingin r thereof relatively to the transversely extend -i "camsurfaces a micrometer screw for Iswmging said disk means for moving said operating 'means backward and forward, and means for limiting the backward moveiment of said operatin means and comprisin means effective to iold the same in operlativerrelation with the die head.

, 8. The combination of a die body and shank said body having an axial bore and =grovided with ways, die blocks movable raialiy in said ways, each of said blocks havat its rear outer end a cam surface extending dcpthwise of the block and having in front thereof a strai ht surface extending .de thwise of the blocii and a cam surface is: ending transversely of such straight sur- !face, means, comprising a disk havin forwardiy irojecting arms and a head inc osin r said is and arms, and having a forwar andbackward movement relatively to said ibody-and shank and beyond which the shank jprqects for attachment to its holding means, said disk also having a swinging movement and effective to close the dies on engagement with the dcpthwise extending cam surfaces .and to hold them against movement on enga ement with such straight surfacesandeffective-to adjust thevdics on ,the-swingingthereof relatively to the transiversely'extendi cam surfaces, a micromieter screw for swinging said disk, means for moving said operatin means backward-and Lthereof relativelyii;

,; movementwf'said operating means and com prising means effective to hold the same in Si ed at Cleveland, Ohio, this 28th day operatlve relation with the diehead, and of arch, 1911. means for OPBIliIlg each of said die blocks A and comprisxng a projection carried'by the 5 blocks and a spring operated device carried Witnessesz.

by the body in engagement with said projec- P. F. Mnnnmomz, hon. A. B. BREEZE.

Copiu of this patent may be obtained for A" can}: each, by droning the commissioner of Patents, wuhln'flon, D. 0.