US2267506A

US2267506A - Diestock

Info

Publication number: US2267506A
Application number: US360652A
Authority: US
Inventors: Harry O Olsen; Albert J Matter
Original assignee: Nye Tool & Machine Works
Current assignee: Nye Tool & Machine Works
Priority date: 1940-10-10
Filing date: 1940-10-10
Publication date: 1941-12-23
Anticipated expiration: 1958-12-23

Description

Dc. 23, 1941. H. o. ollsEN ETAL DIEsTocK Filed Oct. 10, 1940 Patented Dec. 23, 1941 i l UNITEDA PATENT Matter, ParklRidgegIll., assgnorsto The Nye Tool &` Machinel Works, Chicago, Ill., a corpo- Application october io, 19in', srial-im.scorisa 2o claims. (ci. fc4-120::5i):k

Our? invention-relates to improvements in-di'e stocks' off" the general type comprisingv radially movablechasers and meansi cooperating: there-y with to control the receding' movement of the chasers as theoperationlof cutting-` the thread`1 on' an` object, such as for example a pipe; progresses. y. l

One ofour objectsisultoprovide a constructionoiv die stock ofthe'type referred-to whichyshall be adapted for thefthreading' of' articles` offdif-A ferent diameters selectivelywithout-requiring theadjustment or repositioning of'A the'chasers` for" the different diameter articlesv thereby facilitating the Vuse of the stockvr in the threading of articlesof differentdiameters. l

Another object is `to `provide a novel, simple and inexpensivey construction of spring means.

Another Objectis to provide in a die stockl off the type referred to andfprovid'ed with plural sets of chasers -for articlesoi different diameters; a novel, simple :andi economical constructionofi means controlling the-receding off the chasers'ias the 'thread-cuttingoperation progresses: and' a` novel, simple and economical construction-l` df spring means associated with the chasers for' yieldingly urging them to Ireceded position.` l

Another" object is to provide indexing.` or positioning'means for# facilitating!v the setting o'f` thepartsof theldie' stock for cutting'a-standardsize of threador aslightly` larger or smallerthre'ad; when desired, and other objects 'as willibe understood from'the following description. i V v Referring to theac'companyin'g drawing: l Figure 1 is anend viewcfa die stock embodyingmy invention. l i l Figure-2 is affsectionv taken atithe irregular line 2*-2 on'Fig. 1 and' viewed in the direction of thefarrowsi Figure 3 is a plan View of one of: the similar springs for urging the chasers toward recedd position; andi 'i i l i Figure 4, a View iniside elevationof the spring of1ig.3.` i The particular construction showny which con` stitutes `an embodiment of our in'ventionl--i-n'iwlhiclil` provision is made for the selective'threadingY ofy two differentdiameters off articles, comprisesia' ring member 5 havingfa coaxialhub portion' at one side thereof externally threaded as lrepre'- sented at '15,at'which itha's threadedconnection with the cylindrical hub portion Bi (shownllinlpartr onlyl, Aofr a holder inf which. the:articleltoivbe threaded would `be f. rigidlyy clamped;J inf accordance f with= `communi practice, the .diei stock: and work.V holder iniproducing a thread onithe,articlebeingy relatively!rotated,l` which movement thel die stock andlworkhclder, by reasonof the threaded i connection! between them, have relativemovementltoward eachother; Y

.The ring@ member 5wis-provided with; two sets 9i andi I Il of radial Aopenings at different positions along tlielongitudinal ar'zisfofthe sto'ckfor receivinglfandlguiding-twosetsf il and I2 of radially movable` tlc-ireacll`cutting chasers, each set compri'siiigifour chasers spaced apart 90?'.

The-chasers cooperate with-means for controllinglthe receding of the chasers asv the cutting ofthelthreadfonthe larticle progresses; the means shown comprising` pins `I3` of like form. and size secured at'l one end to a-` ring Mj'ournaled onthe hub portionlofv the work holder andheldfagainst longitudinali movement thereon. lThe pins' I?,r

which atl ltheir outer ieridsl extend guidin'gly through openings lfintheringmember 5 are formed intermediate their-Yendswithv taper surfaces IB and I1 vwhich opposeftheouterends of the setsV I'landiv I2lv ofi the chasers,` respectively,

the chasers'being held at all times against these taper* surfaces'l by. spring means hereinafter descriloecl..r f I The arrangement and chasers: and tapervpinsissuch, as shown, `that thefiinnercutting ends-of the set H of chasers extend" closer*` to the' longitudinal axis of the stockf thanv the `seti |21, the? set 12 of chasers,v

way ofi example, being? provided to thread a-2'"` pipea'ndf'thels'et lll yof `chasers a 1%" pipe; it' beings understood: that the article tof be threaded extends. into"the`dielstocki from the right handside in Fig: 2;, v l

By thisV arrangement either' size `pipe may be threaded without adjustment or rearrangement of' the" chasers, thus: saving considerable time iny theselective threading' ofi articles of different` diameters.

`Whetherusedi to thread one or the other of two different diametered articles', the chasersl operating onithe farticle move :radially outwardly under: the'H control ofthe springmeans and the' taper! surfaces a of f the: pins` i3', and thus produce ther desired` tapering thread. on the article.

The spring means referred to.' preferably comprisevai setof'fspring membersA I8; one for each ofl twoyadjacent chasers-of the sets-thereof, each member, formed `of spring wire, being shaped to` presenta centrallyoke portion I9 having a cross piece y201andsubstantially parallel legs 2l and 22` fromythe,

outerendsfofwhicharms

23 and 24,

respectively.; curved toward the center of the yokek I9` and the cross piece 20; extend upwardly inproportioninlg: of the upwardly converging relation as shown in Fig. 4 and terminate in substantially straight oppositely extending

portions

25 and 26 substantially parallel with the cross piece 20 and located above the plane of the latter.

The several spring members I8 are located in openings 21 in the ring members which intersect the openings 9 and I0 in which the chasers are slidable,- the openings 21 containing llets 30 at their opposite ends located in corners of these openings with their inner ends spaced apart and extending inwardly beyond the openings 9 and I0 as illustrated in Fig. 1 of the fillets for one spring, the inner ends of the fillets 30 affording opposed shoulder portions 3|.

In assembling the parts of the die stock the spring members I8 are introduced lengthwise into the openings 27 to seat their yoke portions I9 at their cross pieces 20 in the recesses afforded between the pairs of shoulders 3|', which latter prevent endwise displacement of the spring members in the openings 21, the

end portions

25 and 26 of the spring members extending into the planes of the adjacent openings 9 and I 0, the pins I3 in this operation being withdrawn from the ring 5. The chasers are then introduced into the openings 9 and I0 from the exterior of the ring 5 and in such movement the

end portions

25 and 26 of the spring members enter recesses 32 in the chasers. The pins I3 are then inserted into the openings I5 to the position shown in which operation the chasers are forced radially inward deforming the ends of the spring members I8 against their spring tension as shown in Fig. 2 whereby in the use of the stock for threading an article, the springs continuously urge the chasers against the taper surfaces of the pins I3 during the movement of the stock along the pins toward the work holder.

It is sometimes desirable, in practice, to provide for the cutting of a thread of slightly greater or slightly smaller size than a given standard size thread, as for example a few thousandths of an inch different from the standard size thread. This may be effected in the construction shown as to both sets I and II of the chasers by relatively longitudinally moving the sets of chasers and the pins I3 in a direction toward or away from each other in the direction of the length of the pins by turning the die stock at its threaded connection 'I with the workholder 8 in one direction or the other, as the case may be, to effect the proper setting of the device preliminary to starting the thread cutting operation.

To facilitate the preliminary setting of the parts of the die stock for either a standard size thread or an oversize thread or an under size thread, indexing or positioning means are provided. These means in the construction shown comprise

surfaces

33, 34 and 35 on the ring member extending to different, proper, distances in a direction lengthwise of the pins I3.

When the sets of chasers and the pins I3 are relatively adjusted as stated to a position in which the outer end surface of the one of the taper pins I3 adjacent the surface 33 is flush with the surface 33, as shown in Fig. 2, the chasers and pins I3 will be in the proper relative positions for cutting a standard thread-in the example shown a 11/2 inch thread by the set I I of chasers, and a 2 inch thread by the set I2 of chasers. When the sets of chasers and the pins I3 are relatively adjusted to a position in which the outer end surface of the one of the pins I3 adjacent the surface 34 is ush with the surface 34, the sets of chasers and pins I3 will be in the proper relative positions for cutting slightly larger size threads than the standard size threads; and when the sets of chasers and pins I3 are relatively adjusted to a position in which the outer end surface of the one of the taper pins adjacent the surface 35 is flush with the surface 35, the sets of chasers and the pins I3 will be in the proper relative positions for cutting slightly smaller size threads than the standard size threads.

Preferably the

surfaces

33, 34 and 35 will have associated therewith, as shown, indicia, such as the S -I- and signs, respectively, to facilitate the making of the adjustments referred to.

As will be noted from Fig. 2, the portions of the taper surfaces I6 and I'I which are contacted by the outer ends of the chasers II and I2, respectively, at the start of the threading operation, are located at the same distance from the longitudinal axis of the die stock. This is desirable as thereby the standard form of chasers may be used and the cutting edges of the chasers for both sizes of pipes will be in the proper position relative to the longitudinal axis of the die stock. Furthermore, this feature permits replacing both sets of standard chasers for threading two sizes of pipes,` with two other sets of standard chasers for threading two other sized pipes, or removing one set of chasers, as for example the chasers I2 and replacing them with another set of standard chasers, as for example the chasers II and replacing the chasers I I with standard chasers for threading a smaller sized pipe.

While we have illustrated and described a particular embodiment of our invention we do not wish to be understood as intending to limit it thereto as the structure shown may be variously modified and altered and the invention embodied in other forms of structure without departing from the spirit of the invention; thus while we have shown the stock as having two sets only of chasers for threading only two standard sizes of articles, it will be understood that, if desired, more than two sets of chasers, adapting the structure for threading more than two standard sizes of articles, may be provided, the set for the largest article being the closest one to the work holder and the remaining sets being decreasingly graduated in size therefrom in a direction away from the work holder.

Furthermore, as to the feature of conditioning the device for cutting oversize and undersize threads described and shown in a die stock having a plurality of sets of chasers, it will be understood that this feature may also be provided in a die stock having a single set only of chasers.

What we claim as new and desire to secure by Letters Patent, is:

1. A die stock for cooperation with a workholder, comprising a plurality of sets of radially movable chasers located in diierent planes transversely of the axis of the die stock, the chasers of the respective sets, in the normal condition of the die stock, being positioned inwardly to progressively greater distances from the end of the die stock nearest the workholder toward its opposite end, adapting the die stock for threading articles of different sizes.

2. A die stock for cooperation with a workholder, comprising a plurality of sets of radially movable chasers located in different planes transversely of the axis of the die stock, the chasers of the respective sets, in the normal condition of the die stock, being positioned inwardly to progressiveli'fgreatera distances from the end of the die''steelty nearest" the workholder' toward` its 010-" posits and;` adapting@ the die stock forthreading articles of"di'ilerent sizes, andfmeans for permit'- ting 'radiali outward movement of thev chasers- 5` during-the v'threading operation.

3:'.A1..di stock for Icooperation with a workholden' comprising 'a plurality of setslof radially mvabl'eichasers-locatedlin diiierent planes transverselyofthe axisloiftheidiestock, the chasers 10.

of!therespectlvefsets; in the normal condition ofthe-di`e steckf, being positioned` inwardly to progressivelygreater! distances fromthe end lof' the.A die stecknearest-#the workholdr towardf its opposite en'd', 4adapting theidie' stocky for threading 15 art-icl'e's of different! sizes, "andi means for permitting radial?outwardmovementf-oflthe` chasers 'during. thel threading-l` operation, said means includ"-` in'g.` atapere'd member againstf` which a Chaser offeach;setlthereofibears, said mcnfllicltlldl die stock beingrelatively movable as the threading proceeds` A p .41-In af die"V stock, the` combinationl cf aY ring member,` setsloi: chasersulocated in different planes ofi and simultaneously urging the chasers of 'each 30 set into cooperative relationship withl saidrneans.

.5; In adief stock',` the'` combination of a ring member, setsi of.' chasers llocated in different planes; transversely of the axis ofl the die stock and .radially slidable in said ring member, means controlling .theradial ,outwardimovement of said chasers,xand spring devices on said ringmember eachihaving endtportions engaging Witha chaser ofi each` setiv thereof. and. simultaneously urging the chasers; of-A each. seti. into; cooperative relationship 4o withlsaid.y means.. l

6..,In..a1.die.,stock, the combination of a` ring membergfsets oflchaserslocatedin differenttransverseplanestspaced along the. axis ofthe die stock and :,radially slidable in said ring memb'enmeans controllingfthe. radial .outward movement` of sa'id chasers, and. spring.` devices.` on said? ring member eachv having` aI holding portion between its ends at which it is held to said ring member,- spring endrportions .engaging-with a`chaser of each set thereof Land. transversef portions; connecting said holding portion and said. end portions together, s'aidispringVA devices yieldingl'y urging` the chasers intocooperative .relationship `with said means..

7;' a4 die stock, the combination of a ring 55 tions.connectingfsaid'holding portion and said 65 end portions together, said spring devices yieldingly urging the chasers into cooperative relationship with said means.

8. In a die stock, the combination of a ring member having radial guideways located in different transverse planes spaced along the axis of the die stock and openings extending crosswise of, and intersecting said guideways, sets of chasers radially slidable in said guideways, means controlling the radial outward movement of said chasersgf andi spring devices located inl said-'openeingsi'aeh 'havingl endE portions engaging with a chaserpffe'ach set tlfereof 'and urging the chasers into! cooperative relationship-with said means.

9i In? "a--die stock', the combinationl of. a ring memben having radial guideways located in different 'transverse` planes. spaced along the axis ofthedie st'c'ck'va'nd openings extending crosswise'A of, 'andi intersecting,` said'. guideways, inwardly extending spaced apart stops in said .openings,,setsf of" chasers radially slidable in said. guidewa'ys; means controlling the radial outward m'ovementlof: 'said' chasers, and spring devices locatedinsaidl openings each having. a portion entered betweeni said vstops and held therebyl against lengthwise" movement and end portions engaging a chaser of each set thereof. and urgingthe chasersinto` cooperative relationship with said'means;v

"101' In a die stock', the-combinationoi a ring',v

member` having;v radialY guideways located in; diiferentl transverse planes spaced along the axis oft the; die.- stock and openings extending crosswiseY ofi, and intersecting; said giudevvays,` in- Wardlyfextending spacedapart stops in said openings, sets of chasers radially slidable in said guideways; .meansk controlling the radial outwardl movement .of said chasers, and spring devicesv lo` catedlin said` openingseach having a portion entered betweensaid stops and held .thereby againstv lengthwise movement and transversely extending portions terminating in'outwardly oppositely extending end portions for engagement with afchaser of.' each set thereof land urging. the chasers into` cooperative relationship with said means.

11.,In a. die stock, thefcombination of a ring member: having. radial guid'eways located in different* transverse planes'spaced along the axis `of the die stock and openings extending crosswise of',V and intersecting, said guideways, inwardly extending` spaced apart stops in said openings, setsoflchasersradially slidablein said guideways, meanscontrolling the radial outward movement of said chasers,` and spring 'devices located insaidf opening'sieachihaving afportion enteredV between said stops and' held thereby against lengthwise movement and transversely extending coil portions terminating in outwardly oppositelyv extending: endr portions for engagement` with a Chaser of 'each set .thereof and urging the chasers into cooperative relationship with said means.

I2. In adie. stock, the combination of a ringy member, chasers radially movable in said ring member, and tapered members against which said.; chasers bear, said chasers and tapered members being relatively movable in a direction lengthwise of.' said tapered members, said ta.- pered members permitting radial outward movement; ofsaid chasers during said relative movement, said ring" member having a plurality of circumferentially spaced surfaces extending forwardly to different distances in a direction lengthwise` ofthe tapered members for cooperation with` ends of said tapered members for determining the-proper relative positioning of` said chasers and tapered members, preliminary to starting the cutting operation, for cutting a standard thread or a slightly oversize or undersize thread.

13. In a die stock, the combination of a ring member, a plurality of sets of chasers radially movable in said ring member, said sets of chasers being located in different planes transversely of the axis of the die stock, the chasers of the respective sets, in the normal condition of the die stock, being positioned inwardly to progressively greater distances from the end of the die stock nearest the workholder toward its opposite end adapting the die stock for threading articles of diierent sizes, tapered members against each one of which a chaser of each set thereof bears, said chasers and tapered members being relatively movable in a direction lengthwise of said tapered members, said tapered members permitting radial outward movement of said chasers during said relative movement, and means, including portions of certain of said tapered members for indicating the relative positioning of said chasers and tapered members, preliminary to starting the cutting operation, for cutting standard threads or slightly oversize or undersize threads.

14. In a die stock, the combination of a ring member, sets of chasers located in different planes transversely of the axis of the die stock and radially slidable in said ring member, the chasers of each set being circumferentially spaced, means controlling radial outward movement of said chasers, and spring devices on said ring member each having a central portion adapting the device to be held in position on said ring member and transversely extending portions terminating in outwardly oppositely extending end portions for engagement with adjacent chasers of each set, said spring devices yieldingly urging the chasers into cooperative relationship with said means.

15. In a die stock, the combination of a ring member, sets of chasers located in different planes transversely of the axis of the die stock and radially slidable in said ring member, the chasers of each set being circumferentially spaced, means controlling radial outward movement of said chasers, and spring devices on said ring member and each having a central yoke portion adapting the device to be held in position on said ring member and transversely extending coil portions on the arms of the yoke terminating in outwardly oppositely extending end portions for engagement with adjacent ,.f

chasers of each set, said spring devices yieldingly urging said chasers into cooperative relationship with said means.

16. A die stock for cooperation with a workholder, comprising a plurality of sets of radially movable chasers located in different planes transversely of the axis of the die stock, the chasers of each set being circumferentially spaced, the chasers of the respective sets, in the normal condition of the die stock, being positioned inwardly to progressively greater distances from the end of the die stock nearest the workholder toward its opposite end, adapting the die stock for threading articles of different sizes, the adjacent chasers of said sets being disposed in line longitudinally of the die stock.

17. A die stock for cooperation with a workholder, comprising a plurality of sets of radially movable chasers located in different planes transversely of the axis of the die stock, the

chasers of each set being crcumferentially spaced, the chasers of the respective sets, in the normal condition of the die stock, being positioned inwardly to progressively greater distances from the end of the die stock from the end thereof nearest the workholder toward its opposite end, adapting the die stock for threading articles of diiTerent sizes, the adjacent chasers of said sets being disposed in line longitudinally of the die stock, and means for permitting radial outward movement of said chasers during the threading operation comprising a taper pin for each aligning pair of said chasers.

18. A die stock for cooperation with a workholder, comprising a plurality of sets of radially movable chasers located in different planes transversely of the axis of the die stock, the chasers of the respective sets, in the normal condition of the die stock, being positioned inwardly to progressively greater distances from the end of the die stock nearest the Workholder toward its opposite end, adapting the die stock for threading articles of different sizes, and means for permitting radial outward movement of the chasers during the threading operation, said means including taper pins each having a plurality of taper surfaces so disposed that one Chaser of each set thereof bears against said taper surfaces, respectively, said pins and said die stock being relatively movable as the threading proceeds.

19. A die stock for cooperation With a workholder, comprising a plurality of sets of radially movable chasers located in different planestransversely of the axis of the die stock, the chasers of the respective sets, in the normal condition of the die stock, being positioned inwardly to progressively greater distances from the end of the die stock nearest the Workholder toward its opposite end, adapting the die stock for threading articles of diierent sizes, and means comprising taper pins with spaced chaser-engaging portions thereon for permitting radial outward movement of the chasers during the threading operation, the portions of said taper pins which are engaged by the chasers of said sets at the start of the threading operation being spaced the same distance from the longitudinal axis of the die stock.

20. In a die stock, the combination of an annulus having a circular series of spaced apart housings extending therefrom lengthwise of the die stock, sets of radial chaser-ways in each of said housings, said sets being located at diier- HARRY O. OLSEN. ALBERT J. MATTER.