US2333163A - Automatic die - Google Patents

Description

Nov. 2, 1943. R. R. FINN 2,333,163

AUTOMATIC DIE Filed Dec. 22, 1941 s Sheets-Sheet 1 Nov. 2, 1943. R, R, FINN 2,333,163

AUTOMATIC DI E Filed Dec. 22, 1941 3 Sheets-Sheet 2 LL 7 f4 f5 1% J4 m J m/ mum 21 4 L E 14 2,? Kg? I j (7/ if 046 x" 476/046 {7 PAh r If} 6 [/7 Z b/XLW A g azwimw Nov. 2, 1943. R. R. FINN 2,333,163

AUTOMATIC DIE Filed Dec. 22, 1941 3 Sheets-Sheet 3 l of Figure 4.

Patented Nov. 2, 1943 AUTOMATIC DIE Robert R. Finn, Springfield, Vt., assignor toJones i & Lamson Machine Company, Springfield, Vt., a corporation of Vermont 7 Application December 22, 1941, Serial No. 123,876

Claims. 01. 10-95) Ths invention relates to automatic screw threading dies and has for an object to provide a die which can be opened and closed automatically but when closed may be locked against premature opening as might otherwise be caused by rapid indexing of a lathe turret supporting the i die.

A further object is to provide a die which; when operating on the work, is unlocked in condition to be released and opened when threading has progressed to the desired extent;

Still another object is to provide a construction wherein the die can'progresswith the work under light pressure so as to avoid stripping of work threads of very fine pitch.

Another object is to provide a die which may be locked closed when presented to the work but which by such presentation is automatical- 1y, unlocked and conditioned for automatic, open- .ing when threading of the work has proceeded to a predetermined extent. For a more complete understanding of this in: vention, reference may be had to the accompanying drawings in which I V Figures 1, 2 and 3 are side, front and rear elevations, respectively, of a die embodying the invention, the die being closed and locked, Figure being partly broken away and in section. Figure 4 is a longitudinal section on line 4-4 Figure, 2, but 'with parts broken away or omitted. 1 -Figure dis a view similar to a portion of Fig. ure 4, but showing the die in cutting and unlooked condition. Figure 6 is a cross sectional view on line 6- I Figure 7 is a fragmentary longitudinal section on line of Figure 6., Figure 8 is a detail section on line 8-8-01 Fig ure 7. I

Figure 9 is a detail section on line 9-9 of Figure 4. v

Figure 10 is a view similar to Figure 9, but showing the die in working and unlocked condition. i

Figure 11 is a view similar to Figure 9, but showing the die released by contact of the release rod with a stop.

Figure 12 is a fragmentarypersective view of the die holder.

Figures 13 and 14 are perspective views of the die opening and closing ring and of the locking and opening and closing actuating cam ring, re spectively.

. positions, respectively.

Figure15 is a section: online I5- -I"5 of' Figure4. a Figures 16 andl'? are views similarto Figure 15, but showing the parts in cutting and released Figures [18, 19 and 20 are detail sections on the correspondingly numbered section lines of Figures 15, 16 and ,17,,respectively. H l g Figure 21 is a view partly in side evation and partly in section showing the; die in open position, the release ,having been effectedibystop ping the progress ofthe die holder when threading hasprogressedpto the desired extent.

The die as shown comprises a sleeve I having a shank portion, 2 and. an enlarged diameter head 3. The shank portion 2, is supported for limited axial motion inia. holder 4. The. head portion 3 has, an integral face plate 5, as shown in Figure 1, having dovetailed ways .6 therein for the reception of chaser carrying blocks! to which ch'asers, as 8,,may be secured. Back of the face plate 5 and slidable axially on the head (Us a die openingand closing member 10 shown detached in Figure .13. This member l0 has on its forward face outwardly inclined fingers II which project throughjo'peningssfl of. the face plate 5 and engage in mating openings I3 in the chaser blocks 1. As the member H1 is Inovedforwardly from the position shown inFigure 21 to. that shown in Figure 4, the chasers and blocks are moved substantiallyradially toward the axis of the die thus to close-the die in conditionfor operating on the work as shown'in Figure 2. By' moving the member ID rearwardly from the' po-' sition shown in Figure4 to the position shown in Figure 21, the chaser carrying blocks are moved outwardly thus opening the die. I The member I0 is pressed toward its open position as by means of springs I5 seated inrecesses I6 and I! of the face plate andrin'g I0; respectively,-and media is closed and heldin closed position by means of a cam plate 20, shown detached in Figure 14. This cam plate lllhasinclined cam faces 2| adapted to'engage cam faces 22 on lugs 23 on the back-face of the member, the cam faces'Zl ofthe member 20 at times being positioned between the-cam lugs '23 in which position the die is maintained open by the springs I5 By rocking the member 20 from this angular position, however, the-cam faces 2| may bemoved in engagement with'the cam faces, 22," causing the member ill to be wedged forwardly into closed disposition. This 4 member 20 is rockably mounted on thehead 3,

and is held up againstthe rear race of the mem- Erased esaiiiet her In by means of a disk 25 backed up by a nut member 26 threaded onto the rear end portion of the head 3. Adjustment of this nut 23 determines the extent of inward motion of the chasers to closed position. Means are shown for retaining the nut 26 in adjusted position comprising a pointed screw 28 engaging between serrations 29 in t h'e periphery of the nut .25, this screw being barr'ied in a casing infember 3i] Secured to the ring 25 and being adjustable in and out by means of a manually engageable The ringi25 is held against turning by a -%aii* of lugs 32 and 33 projecting through sl ts -M therein, these lugs being integralgyith a fliange I portion 35 of the die holder 4. As is well kn'own 31v M H of a pin 52 projecting across the bore of the in the art, the shank portion of this die holder may be clamped in position-1n a suitable teol holder such as a turret of a turret lathe. w h ile the lugs 32 and, 33 extend into the plane of the rifig member "ZUj theie i's -uflicient clearaffce in thi ringv memberto permit rocking motidhhf th ring'n'i'mberfffl eetwen iie *a"g1i lar* p sition "where'- the"liig's"23can tween the feain faces 2!, the dle then be snown h'rt treao, tba *die'c v 111 further rid-leaking ee: sition shown infFigiiie "I8. TE-s fatter-position ivmibeinereruu nesefited' la er. 7 The 'iielaerwe-ajacmtothe were is proyi'de'd V a'y'*be"pressed into"a lioletherel sshowninFigure lfthisZelder/e 33 having a 'fiQtch at one "s'ide at 37 (see'Figures "9 and I2 "Adjacent 'to'thefileevefi'i a'oorfe ermeds'crew 4b is 'threaded th'roiigh the member 35 and aiiut ".4 l is threaded "on its opposite "eridto bear against the 'back face of the portion=3'5*"b'y which thef'extcfit that Lt'he' "cone: point 5 projects from the" forward face'of "thep'ortion' 35 ma'y be adjiisted andffixed. This -cone pointproj ects toward" the back"edge"'o'f,aa*notch 421in1a radial extension or Wingi43"'of the member-52.0, (Figures 14 to 17) and" adjacent to thisnotchfifl; this membri43 'isLsho-wn'asproyided;with afiat'heade ed pIug144. :lnthegibcked :angular position :of the'f-meinber "20; thisarplug 44' isiipartlyrin alinlement"w'ith' the face 45'Q'at' one sideof the" notch 3'l 'ofthe sleeve? 3iiras shown in Figure ,9, 'so that in thisaangiilar and;;'axial='position of the memberzlil, the member 20*ha's .aclimited orwa'rd'a;; ialtmotionrwithrspiecttqthe, sleeve 35 beiore-it stfikesf'the'face 45 of the sleeve. When'the member 20 istin'ilthe ,an u1a i"position'corresponding to Figlli'fi;19:WhlfQ;th6:fll8 is closed butnot lacked,

ion 450i thesleevewandithere i 'I h T}Q. I e xtended;v ran e pi r la ive; a ia moti tween these parts th s. m e v =e l21 e i =re1- a i lly. W h re iz tt qiihe h lde e b twini gress plu sflfi s e 12 pasitien-thg onep m hfig is sufii e itly retracte is ed -iet arcinr r ess relative to theholderfi 1nto t in he ge This e geestne" Jot gigu'r i9, and it an die mitted when the ring 20 is in looking position,v since the member 44 is then out of impinging relation to the face 45 of the limiting sleeve. If thereafter the holder 4 be held so that the die, while in engagement with the work continues to be threaded thereonto, the cam face 46 of the Wing 43 strikes against an oppositely inclined race 5 fl of a.rod 5| carried-within the sleeve 36 eeqg i rpwqe ie 'afi rii ib 1 i=+" sition of FigureZO, whereupon the die is immediately opened by the action of the springs 55.

' This released axial position of the die head with to the holder 4 is shown in Figure 21.

The rod 5i has a limited axial motion in the eye *35 "being :p'reyented from becoming detachedtherefroin, as shown in Figure 4, by means The, rod 5! is normally pressed forwardly as far asfi'fmitted by the slot 53 and the pin 52, as by means ofarspring 4 reacting between :thEz-ffib.

wardend' of: t-1ie- -s1eeve--3i5- and a collar 55 gpinned tothe-rod 5 1". j'As soonas thedieds ppe-nedcand thus released-from the e e it. drawn back With-respect to' its hel'der i=4, thisnbeing accomplished byalightcoil; spring (seerZEigu-re A and 21) seated in a socket Si in a'plug This plug-has an; enlarged diameter portion fi3iorming -;a;presse d ;1fitin the rear :end offlthe holdere and; havinga fla l 64 over-lapping the rear end of this holder is spring reac'tsiagainst'the base 5 ofthe socket; 6 Land afcollarftdiheld ii-nw'p'ositiondey t; heheadpi ascrew ae tnreened into the reapextremity 6f fa "headedr'rodi 6'! the? head as of which ma hgegefinre'ecumeibored'porn fifi within the' iieem, headl3 is'open at'its forwardendfasgatflbfto permit 'the'ihsen tidi i offthe "rdd"'s1. The "rod vsrfnas efreduced iameter free efidf linin a "shoulder 1 l which cause stripping of-theth1eads onthework'when these threads j afe v'ery fine, it" being only sumciently' heai'iy cause the. return' ofthe head" to thdbsitihh sh wh inFigurenfwhn"thedie' has been "re easeeurtin ItheW rk, ."This f spring i of itself fwouid "be"iiiisuYficienfly heaVy' to'prevent entrifugaf'force' eke'rtd bathe head during the indexing of the turret. carrying the die-causing iorwaifdfirfotion there'of suflicient "to" open 'the die; but" this "is'15revei1ted*when'thering zElis in locking position by impingementbf "the-member t4"e amstthe-saeumefl 5"of the sleeve 3 6. When the die is in idle position, thereforefithe ring zfl is turnedto locking%siti5n, such in erracting first to close the 5 y anys'uitable mealns as-is i wellkriown in the anew that i the poi tion 43 engages the sleeve 38 as shown in Figurecifi.

It "will -be noted thatitherel': is ldsts ametibn between the shank 2 and the plug 52 unaffected by the spring *60 "'rbetweenrthe 'pos'iti'ons'=offi'the head "show-min Figures" ra-nd 5. The die isvthus free to follow the lead of the threads onwthe work to a-sufiicientfixtent to allow :for-errors inaccuracy of 'the feeding-mechanism; its position being controlled only bymthepressure ofthe The die is thnclosed arid locked and the arious parts-are in the [position l'shown in? Figures 1 toe-9," 15 and' 1s whezi theiiaie'.isr resentd'tdthiWrk by for were pressure-exerted on thholdr" 4","'the"'die"'head is'pressedvreen stopping the forward travel of the holder 4 with the die head as has been described. Another method of :opening thedie consists in stopping the forward movement of therod 5| as by impingement upon a stationary stop '12 as shown in Figure 11; The forward movement of the die after this occurs causes the rod 5| to be retracted within the sleeve 36 against the pressure of the spring 54, causing the inclined face 50 thereof to: impinge on the cam face 46 of the wing and rock the member 20 to die open position.

In order to prevent access of dirt to the interior of the die, a circular shield member 15 surrounding and carried by the member and bridging over into a reduced diameter portion 16 of the face plate portion 5 maybe employed.

From the foregoing description of an embodimentofthis invention, it should be evident to those skilled in the art that various changes and modifications might be made without departing from the spirit or scope of this invention.

, I claim:

1. In a die comprising a head, a holder for said head with respect to which said head has a limited axial lost motion, chasers carried by said head and normally biased to open positions, means movably mounted on said head'for closing said die and for holding said die closed, and means actuated by motion of said head axially toward one limit of said lost motion for moving said movable means to release said die to open,

means supporting said movable means for motion from diefopen position beyond closing position to locking position, means coacting with said movable means when said movable means is in by said head formotion between die open and die' closed positions, a member movably carried by said head and having operative engagement with said chasers for closing or opening said die by motion of said member,- means biasing said member to die open position, an actuating member movably carried by said head and having means operatively related to said die opening and closing member for moving said opening and closing memberto closed position by motion of said actuating member in one directionand by further motion in the same direction to locking position, and for releasing said opening andclosing member to permit opening of said die by motion of said actuating member in the opposite direction, a die holder with respect to which said head has a limited axial motion,

operative connections betweensaid holder and actuating member causing the ,motion of said holder to press said head onto the work, causing relative axial motion between said head and looking to holding position, and 'meansactu-i able on threading of the work to a predeterjmined extent to move said member from hold-- ing position in releasing "direction.

3. A die comprising a head, chasers supported by said head for motion between" die open and die closed positions, a member movably carried by said head and having operative engagement with said chasers for closing or opening said die by motion of said member, means biasing said member to die open position, an actuating member" rockably carried by said head and .having means operatively related to said die opening and closing member for moving said opening and closing member to closed position by rocking motion of said actuating member in one direction and by further motion inthe same direction to locking position, and for releasing said opening and closing member to permit opening of said die by rocking of said actuating member in the opposite direction, a die holder with respect to which said head has a limited axial motion, op-

erative connections between said holder and actuating member causing the motion of said holder to press said head onto the work, causing rela-L tive axial motion between said head and holder-,:

to rock said actuating member. from lockingi to holding position, and means actuated by relative.

axial motion between said head and holder thereafter, as said head threads onto the work while said holder is stopped, to rock said.mem-' her from holding position in releasing direction.

4. A die comprising a head, chasers carried by said head, a member movable on said headand operatively connected to said chasers for open' ing and closing said die, means tending to openv said die, a holder supporting said head for lim-,

ited relative axial motion, an actuating member for said opening and'closing member movably 'carried'by said head, said actuating member being movable on said head between die open, die closed, and die closed locking positions, and operatively connected to said opening and closing member, causing motion of said actuating member from die open to die closed position to move said opening and closing member to die closed position, and means carried by said holder effective by relative motion of said holder and head as said head is pressed onto the work by pressure exerted on said holder to move said actuating member from die closed locking position to die closed position, said die including means for moving said actuating member from die closed position sufiicientl to permit said tending means to open the die when the work has been threaded to the desired extent.

5. A die comprising a head, a holder supporting said head for limited relative axial motion, chasers carried by said headand movable between die open and die closed positions, means tending to open said die, means for closing and releasing said die comprising a member rockably carried by said head and movable axially relative to said holder between limits, means biasing said member to an axial position spaced a predetermined amount from its, rearward limit, a stop carried by saidholder in position to limit the forward motion of said member relative to said holder only when said member is in locking angular p0sition,means actuable by forward motion of said member beyond said stopped position to turn said member from die closed to die open position, and means actuated byrearward motion of said member from its biased position to turn said member fromdie locked angular posh tion to die closed angular position in which die closed angular'position forward motion of said member to die open position is permitted.

6. A die comprising ahead, a holder supporting said head for limited relative axial motion, ohasers carried by said head and movable between dieopen and die closedpositions'means tending to open said die, means for closing :and releasing said die comprising a member ro'clo ably carried by said head and-movable axially beveled face for cooperation with the beveled face of said rod to rock said member into die released position, meansyieldingly: holding said rod atits forward limit of motion with its beveled face out of reach of said member beveled face when said member-is in locked angular pa.v

sition but in position to cooperate with said member face either by retraction of said rod or by forward motion of said member beyond its lock limited position to cause rocking of. said mem her from die closed to die openposition, and means effective toturn said member from locked angular position to die closed position when said member is moved rearwardly from its biased axial position.

I. A die comprising ahead, a holder for said head and relative to which said heod'may have limited axial motion, means tendin to hold aid head in one axi l position betweenits limits,

4?}, said head, and operative connections between aid mech nism and said holder ausing axial motion of said head relative ov said h lder in one direction from said position to change said, mechanism from locking to closed. condition, and.

oper tive connections between said mechanism- 8, A diecomprising a head, a holder for said head and relative to which said head may-have limited axial motion, means tending to hold said head spaced a predetermined amount from its rear, limit of motion, means tending to returnsaid head to said. spaced position when displaced forwardl therefrom, die opening, closing andloclrine' mechanismcarried by said head, and: operative connections between said mechanism; and holder causing rearward motion of said...

head from said. spaced positiona by pressure of the die onto the work while said holder is stationary, to cause said mechanism when in die dition.

closins and lockin mechanism carriedbY:

- 9. A die comprising a head, a holder for said head and relative to which said head may have limited axial motion, means tending to hold said head spaced a predetermined amount from its rear limit of motion, means tending to return said head to said spaced position when displaced forwardly therefrom, die opening, closing and locking mechanism carried by said head, opera ative connections between said mechanism and holder causing rearward motion of said head from said spaced position, as by pressure exerted on said holder to start the die onto work, to condition said mechanism from die locked to die closed condition, operative connections between said mechanism and holder causing the forward motion of said head from said spaced position relat tive to said holder as by threading ofthedie onto the work while said holder is stationary, to cause saidmechanism when in die closed con.- dition to be changedito die open condition, and means for actuating said last named connections toohange said mechanism from die closed to die open position irrespective of anymotion of said head relative to said holder.

10.. A die comprising a head, a holder for said head and relative to which said head may have limited axial motion, means tending to hold said head spaced a predetermined amount from its rear limit of motion, means tending to return said head to said spaced position when displaced forwardly therefrom. die opening, closing and locking mechanism carried by said head, operative connections between said mechanism and bolder causing rearward motion of said head from said paced position, as by pressure exerted on said holder to start the die onto work, to condition said mechanism from die locked to die closed condition, and operative connection between said mechanism and holder causing the forward inotion of said head from said spaced position rela tive to said holder, as, by threading of the die onto the work while said holder is stationary,

to cause said mechanism when in die closed condition to be changed to die open condition, and other means effective to change said mechanism from die closed to open condition irrespectiveof head and relative to which said head may have any motion of said head relativeto said holder 11. A die comprising a head, a holder for said head and relative to which said head may have limited axial motion, means tending to holdsaid head spaced a predetermined amount from its rear limit of motion, means tending to return said head to said spaced position when displaced forwardly therefrom, die opening, closing and locking mechanism carried by said head, and

operative connec ions between said mechanism 7 and holder causing rearward motion of said head from said spaced position, as by pressure exerted tween said mechanism and holder causing the forward motion of said head from said spaced. position relative tosaid holder, ashy threading exerted on said holder tostart the die onto work. to condition said mechanism from die. locked "to disclosed condition, and operative connections between said h1eohanism1and holder causing the. forward motion of said head from said spaced J position relative to said holder, as by threadin of the die on o the work while said h lder is stationary, to canoe said mechanism when the closed condition to be changed to die open condgtionsaid holder havin means cooperatin with Y said mechanism when said mechanism is indie locked condition to prevent forward motion of said head relative to said holder from said spaced posit-ion suflicient to change said mechanism to die open condition.

:12; A die comprising a head, a holder for said head and relative to which said head may have limited axial motion, said head having a shank portion and said holder having a sleeve in which said shank portion is axially movable, arod extending through said shank portion and having a head at its forward end for engagement of its rear face on said die head, and a reduced diameter rear end portion defining a shoulder, an

element carried by said shank and through which said reduced diameter portion extends, said die head having a limited axial motion relative to said rod, spring means reacting between said element and said rod tending to hold said die head retracted with respect to said holder to the for-- ward limit of axial motion of said die head relative to said rod, yielding means reacting be tween said die head and holder tending to hold said die head at said forward limit, die opening, closing and locking mechanism carried by said die head, and operative connections between said mechanism and said holder causing relative motion of said die head rearwardly from said for- Ward limit of axial motion of said die head relative to said rod to condition said mechanism to die closed condition, and forward motion of said die head against the pressure of said spring means to change said mechanism to die open condition, said holder and mechanism having means 00- operating when said mechanism is in die locked condition to prevent forward motion of said die head relative to said holder sufficient to change said mechanism to die open condition.

13. A die comprising a head, a holder for said head with respect to which said head has a limited axial motion, chasers carried by said head, a member movably carried by said head and in operative engagement with said chasers to close said chasers on motion of said member to a definite position and normally biased away from said position to open said chasers, a locking member movably mounted on said head and having three positions in each of two of which it engages said movable member and holds said movable mem ber in chaser closed position, and in the third position it permits said movable member to move to said chaser open position, means engageable with said locking member when in one of its said two positions and actuable to move said locking member to chaser open position when the die has threaded Work to a predetermined extent, means for preventing operation of said engageable r means to move said locking member to die open position from the other of said two positions, and elements on said holder and locki'ng'member cooperatively engaging, on motion of said head relative to said holder through pressure exerted on said head when said holder first presents said head to work to be threaded, to move said lock ingmeans from the other of said two positions to said one of said two positions.

14. A die comprising a head, a holder for said head with respect to which said head has a limited axial motion, chasers carried by said head and movable between open and closed positions, a member mounted on said head for axial motion and having parts operatively engaging said chasers to close said chasers on forward motion of said member froma retracted position in which said member holds said chasers open, spring means tending to hold said member in retracted chaser open position, and a locking member rockably carried by said head about an axis lengthwise of said head and having three angular positions, elements on said locking and axially movable members cooperating when said lockingmember isin either of two of said angular positions to hold said axial memberin forward closed chaser position but permitting said axially movable member to assume chaser open position when,

said locking member is in the third angular position, cam parts on said locking member and holder cooperating on forward motion of said locking member with said head relative to said holder from an intermediate position to rock said locking member from one of said two positions to said third position to permit opening of said chasers, parts of said locking member and holder when said locking member is in the other of said two angular positions cooperating to prevent such forward motion of said head with respect to said holder, said locking member and holder having cam parts cooperating when said locking member is in said other angular position by motion of said head'rearwardly relativeto said holder from said intermediate axial position, as when said head is pushed against the work by said holder, to rock said locking member from said other angular position to said one angular position.

15. A die comprising a head, a holder for said head withrespectto which said head has a limited axial motion, chasers carried by said head and movable between open and closed positions, a member mounted on said head for axial motion and] having parts operatively engaging said chasers to close said chasers on forward motion of said member from a retracted position in which said member holds said chasers open, spring means tending to hold said member in retracted chaser open position, and a locking member rockably carried by said head about an axis lengthwise of said head and having three angular positions, elements on said-locking and axially movable members cooperating when said locking member is in either of two of said angular positions to hold said axial member in forward closed chasers, parts of said locking member and holder when said locking member is in the other of said two angular positions cooperating to prevent such forward motion of said head with respect to said holder, said locking member and holder having cam parts cooperating when said locking member is in said other angular position by motion of said head rearwardly relative to said holder from said intermediate axial position, as when said head is pushed against the Work by said holder, to rock said locking member from said other angular position to said one angular position, said firstmentioned holder cam part being mounted on said holder for motion toward said cooperating member part and provided with a portion for engagement with an actuating element by which said movable cam part may be moved to cooperate with its mating member part and cause said locking member to release said chasers to open..

ROBERT R. FINN.

- 1 CERTIFICATE OF CORRECTION. 7 Patent No. 2,555,165 V NOVember 2, 91 5.

ROBERT 'R. FINN.

It is hereby certified that error appears in the printed specification of the above numbered patent fequiring correctionas follows: Page '14., sec- 0nd column, line 1+6, claim 10, strike out head and felative to which said head may have"; and that the said Letters Patent should be read with this corneeti on therein that the same may conform .to the record of the case in the Patent Office. I a

Signed and sealed this 7th day of December, A. D. 1915.

Henry Van Arsdale, (36031 I Acting commissioner of jPatents.

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