US1867192A - Self opening die-head - Google Patents

Description

July 12, R M STRICKLAND SELF OPENING DIE HEAD Filed May 28, 1931 3 sheeheet i 1 n 553153 annum l 1 23 YW w! ZZ 65 V 5 2f July 12, 1932- R, M. STRIGKLAND 1,867,192

SELF' OPENING DIE HEAD VFiled May 28, 1931 5 Sheets-Sheet 2 l 35 #56?65'46 67 22 5f 7 N w'l//f////l//M j ff July 12, 1932- R. M. STRICKLAND 1,867,192

SELF OPENING DIE HEAD Filed Ma 28, 1951 3 Sheets-Sheet 3 35N 25J/f@ y? y @f 7 27 a v "w, A

Patented July 12,v 1931?..

Umrs'nfsrares PATENT. @ma

Royen M. s'rnrcxrannor New HAVEN, coNNEcrIeuT', Assrsnon 'ro THE G EoMETnIC. l Toor. confrannfor nn'w HAVEN, oonnno'rrcur, A CORPQRATION 'sans OPENING v:DIEQHEAD' Appiicatioa sied Mayas, 1931. serial No. 540,542.- 1

This invention relates to improvement in self-opening die-heads and particularly to that type of die-heads commonly referred to as pullbl die-heads and provided with a Chaser-carrier slidably mounted with respect to certain features of theA die-head, so that al forward draft exerted by the work will effect the tripping and hence the vautomatic opening of the die-head. Y

The main object of this invention is toprovide a durable and rugged self-openingdiehead of the character referred to, constructed with particular reference to compactness, smoothness and accuracy of performance, and its capacity for uninterrupted severe use over long periods without'suffering derangey ment or other failure.

l/Vith the above and other obgects 1n view as will appear from the following, my in-V vention consists in a self-openingdie-head having certain details of construction rand combination ofparts as will be hereinafter described and particularly recited in theV claims. Y In the Aaccompanying drawings: Fig.

opening die-head constructed inaccordance with my invention;

Fig. 2 is a View thereof in front elevation; Fig. 3 is a central longitudinal sectional view thereof, taken on the line 8-3 of Fig. 2,

but on a larger scale7 the parts being shown in the positions due to them when the chasers are in their cutting'position;

Fig. 4 is a corresponding view, but showing the parts in the positions due to them when the latching-mechanism is about to release the Chaser-operating member to permitv the retraction of the chasers;

Fig is a correspondinw view,` but showing the parts in the positionsl due to them` F jg. 8 is a similar view taken on the liney l 30 provided with an axial'bore 31 extending 8*8 of Fig. 6;

1 is a view in side elevation of a self.-k

f Fig. 9' is a corresponding view on the line 9 9 of Fig. 2;

n Fig. 10vis a view in front elevation of the n mounting-member detached; y y

Fig. 11 is a side View thereof with the shank broken away;

Fig. 12 is a top 4or planl view thereof with the shank broken away;`

Fig. 13 is a broken longitudinal'sectional` view taken on the line 13--13 of Fig. 10;

ing member, detached; i

' Fig. V15 is a view thereof'in rear elevation;`

Fig. 16 isa view infront elevation ofthe latchingrnember detached; and

Fig. 17 is an edge view thereof. y

The particular self-opening die-head herein `chosen for the illustration of my `invention includes, as shown, a mounting-,member generally designated bythe numeral 20 Aand consisting of a rearwardly-projecting shank 2l'by means of which the toolmay bemountedv in the turret 22, indicated by broken lines, of any suitablefthreading-machine. The vforward portion of the mounting-member 20 constitutes a head y23 consisting of an annular flange 24 formed integral with the shank 21 and a separately-formed ring 25 corresponding in ldiameter tothe diameter of the flange24 to* which Vitis secured by aVV pair of screws 26T-26. n

The ring 25 just referred to is made sep-arate'from the flange 24 and shank 21 solely for the purpose of convenience in manufac#V ture, but for lall functional purposes consti,-

tutes an integral element and may beso viewed in the present invention. The ring 25 of the mounting-member 20 is diametrically cut 0r bifurcated toprovide a forwardly-facing diametrical couplingA groove 27 (Figs. 10 and 12) into and beyond Vi160 Fig. 14 isa lside view of thechaser'fcarry-` which forwardly extends al guide-sleeveV 28 ,y formed integrall with the flange 24-and `shank 21, and through which extends,` as well as through thesaid shank, an axi'alborevor pas-A sage 29 to provide clearance for the work as Y thel same is being threaded. V Slidably mounted upon theV guider-sleeve "28 is a reciprocating Chaser-carrying member A i `completely therethrough and receiving thersaid guide-sleeve 28. The said chaser-carrying member is formed with a rearwardlyextendingcoupling-tang 32 having two iat faces and two convex faces, and fitting into the couplingfgroove 27 in the ring 25 of the lmounting-member 20, which itclosely fits,

with freedom only for axial vsliding movement. i Y

The Chaser-carrying Imem-ber 30 is. pro- V vided in its forward face with Yfour(more or f less) radial guide-grooves 33, each receiving a radially-movable chaser 34, which chasers are retained in place against forward displacement by segmental plates 35 secured to the forward face of the said chaser-carrying member 30.

The outer ends yof each of the chasers34` are 'rearwardly Y and inwardly-inclined to form cam-surfaces 36,.as shown in Fig. 9, for

Y. engagement with similarly-sloping canifsurfaces 37 formed upon the ,forward inner corner of a Chaser-operating sleeve 38 mounted i Vupon the diej-head structure with capacity for axial sliding movementand bearing'at its forward end upon the periphery of the chaserfcarryin'g member 30,' and' internally-V threaded at its rearend for the reception of theforward end of an` adjusting-ring 39, which slides partly upon-the periphery of rthe ring 25 of the mounting-member 20, as

well as the flangev 23 thereof, and also upon the periphery of the rearwardly-extending tang ofthe Chaser-carrying member 30.V

The 'Chaser-operating member 38 and adV jnstingr1ng39 aboverreferred to, 1normally function as a junit but are made adjustable withVv respect toV each 4other for the purpose of permitting van adjustment ofthe cutting diameter of the chasers, as will lhereinafter appear.

f', I`he-`- adjusting-ring 39 which, as above polntedV out, is unitary with the Chaser-oper-` 5' ating sleeve y38, is formed in itsinterior with an annular groove 40, the forward wall of Vvwhich forms a locking-shoulder 41 for engagement with the forward upper corner of a radially-movable plate-like locking-member 42 mounted in a transverse tangential groove couplingftang 32. of

pair of springs 44-44 housed within complev Amentary pockets, respectively formed in the inner face of the said locking-member and'in vthe bottom-wall of thev groove 43, as clearly Y shown in Fig. 6, and is limited in its outward V:movement by a retractable stop-plunger 45 having its stem 46'riding ina passage 47 in the Chaser-carrying member 30 and project-` ing rearwardly into the groove 43 and into a *Chaser-carrying' member 30.Y

ing-shoulder 41- of the sleeve 38, I provide the said 'locking-member at its respective opposite ends withoperating-ribs 52-52 havingV the notch 48 their upper surfaces forwardly and inwardlyA Y inclined as. shown, 'and respectively entered into grooves 53-53 formed in the respective opposite walls of the groove 27 in the ring 25 before referred to. The respective upper walls of the'said grooves 53--53 are forward- Y ly`v and inwardly inclined in conformity with the slope of the ribs 52-52 of the, lockingmember 42 to provide cam-surfaces 5357-53a engaging the said ribs for the purpose as will hereinafter appear.

The Chaser-'operating sleeve 38 togetherl with the adjusting-ring 39, is urged rearwardly with respect to the Chaser-carrying member 30 by vmeans of a pair of complementary spring-pressed plungers 54-54 (Figs. 6` and 7 reciprocatingwithin bores 55-55 in the forwardportion of the chasercarrying member 30 and bearing at their rear ends against the forward end of the adjusting-ring 39. The said plungers 54:-54 are chambered as shown in Fig. 7 and each partially housesa spring 56 bearing'at its rear end in the said plunger and at its forward end against one 'of the faces ofthe retainingplate 35,'so as to exert a constant effort to move the adjusting-ring 39 and hence the Chaser-operating sleeve 38 rearward Vwith respect to the chaser-carrying member 30. To

.permit the free play ofthe plungers 54, the

adjacent periphery ofthe ring 25o-f the mounting-member is formed with semi-circular clearance-grooves 57-57. f

- Similarly, thel Chaser-carrying member 30 is constantlywurged rearwardly withirespect to the mounting-member 2O` by means of a pair of complementary springs 58-58 respectively encircling screws 59f-59`(Figs. 6 and 8) Vscrewed into and rearwardly projecting from the Chaser-carrying member 30. Each .of the saidscrews 59 audits complementary spring 58 extends within a bore 60 formed in the ring 25 on each of the respective opposite sides of `its groove 27 Each, of the said springs58 bears at its rear endl against the underside of the head of its complementary screw 59` and at its forward end bears against a sliding bushing 61.1' The head of each of 1 the saidrbushings normally bears against an annular stop-shoulder 62 formingafeature of each of the bores 60, while' the forward l. j l endsfof the said bushings bear against the notch 48. 1n ythe upper arcuate face of the said. p I; locking-member. The stop-plunger 45 is pro-.v

rear face of the enlargediforward end of the Y and each is urged forwardly by aspiring 64v the guide-sleeve 38 of themounting-member 2O with respect to which it may move either forwardly or backwardly from the position in which it is shown in Fig. 3.

To provide a ,yieldingv contact when the tool as a whole is advanced ,to engage the chasers 34 with the work, I employ a pair of complementary plungers 63-63 mounted partially in the rear end of the ring 25 and partially in the iiange 24 of the mountingmember 20, as shown in Figs. 3, 4 and 5. The forward ends of the said plungers engage the rear face of the Chaser-carrying member 30 and limited inv such forwardmovement by being provided with an annular flange 65 engaging a stop-shoulder 66 in thesaid ring 25.

The adjusting-ring 39 owing to its threaded connection before described with the Chaser-operating member 38, is rotatable with respect tothe latter for the purpose of adjusting the position of the locking-shoulder41 and hence regulating the cutting diameter of the chasers 34 and is lockedin any given position of adjustment by a latch 67 reciproeating in a bore 68 .formed `in the said chaseroperating sleeve and urged rearwardly by means of a spring 69 to engage itsrear end with any given oneof an annular series of forwardly-facing pockets 70 formed inthe said adj Listing-ring 39. v

For the purpose of moving the chaseroperating sleeve 38 forwardly to move the chasers into their cutting positions, after the die-head has been tripped, I employ a resetting-finger 71 having a rounded terminal 72 projecting within a radial socket 73 `formed in the Chaser-carrying member 30, and located in a recess 74 formed in a lug 75 offsetting from and formed integral with the said operating-sleeve 38, as shown in Fig. 6.

kThe resetting-finger 71 Vreferred to *is mounted upon a squared portion 76 of a resetting-shaft 77 rocking in a bore 7 8 in the lug and formed at its outer end with an integral resettting-arm 79 adapted vto be engaged with any of the customary features of a threading machine for resetting the liehead as will hereinafter appear.

My improved die-head operates in a general way in accordance with that class of self-opening die-heads known as the pulloff type. y

With the parts in the positions in which they are shown in Figs. 1 to 3 inclusive, the chasers 34 may be engaged with the work or the work with the chasers. When the desired length of thread has been cut, the feedV of the work with respect to the die-header the feed of the die-heady with respect to theA work, as

the case may be, is stopped, after which the` continued rotation of the vwork will act through thechasers 34v to ldraw" the entire Chaser-carrying member 30 forwardly with respect vto the mounting-member `20. The relative forward movement of thechaser-carrying member 30 as just described, will bodily ycarry with it the locking-member 42 together with vthe chaser-'operating sleeve 38 and adjusting-ring 39.

As the locking-member 42 is vbodily moved forward, as above described, its offsettingribs 52 will be caused yto ride down the slope of theupper` walls 13a-5.3a of the complementary grooves, 53 formed in the opposite walls of the coupling-groove 27 with the effect of gradually moving the said locking member inward to disengage the same from the annular locking-shoulder 41 in thel ady j usting-ring 39.

The parts will now have assumed the posi-f tions in which they are shown inl Fig.-4, at which time the locking-member 42 is shown at the instant it is being cleared fromthe locking-shoulder 41.

Y The instant that the locking-member 42 is fully cleared from the annular locking-shoulder 41 of the adjusting-ring 39, the springs 56-56 will act to snap the Chaser-operating sleevel38, together with the said adjustingring 39, rearward to permit each of the chasers 34to move radially outward out of engagementV with the work under the urge of chaser-retracting springs 80 (Fig. 9), oneof which is provided for each of the said chasers.`

The instant that the chasers `34 move radially outward out of engagement with the work, as above described, the springs 58-58' will assert themselves and move the chasercarrying member 30 from `theposition into which itlias been pulled by the draft exerted by the work, (Fig. 4) rearward to its normal position of equilibrium with respect to the mounting-member 20. The parts will now have assumed the positions in which theyare v shownin Fig. 5. l

When itis desired to perform another threading operation a4 lrelatively-rearward force exerted upon the resetting-arm 79 will rock the shaft 77 and hence the resettingfinger 71, with theeffect of sliding` the chaseroperating sleeve forwardly together with the adjusting-ring 39, which latter will ride over the locking-member 42, Amomentarily depressing the same until the annular lockingshoulder 41 in the said ring has ridden past the forward edge of the sai d locking-member,

at which time the latter willsnap outwardly into the groove 40 in position to engage the f said shoulder 41 and prevent the rearward movement ofthe said ring and the sleeve 38- until such time as the die-head is again l tripped.

The forward sliding Vmovement of the `1 Chaser-operating member 38 andthe adjust-- ing-ring 39 will also cause the cani-surfaces 37 at the forwardedge of the said ring to ride I over the cam-surfaces 36 Vupon they'respective i* chasers 34 and concurrently moveeach of the latter inwardly into position-for cutting a thread; The parts have now been'rest'ored to-the positions in which they are shown in 791may be manually operated. Y f- Y `VItrwill be appreciated that as athreading operation is going on, there will bea strong tendency to rotate the chaser-carrying,member with respect to the mounting-member 42O,v which tendency is effectively resisted without occasioning cramping by the coupling-tang 32 engaging with the walls of the coupling-groove 27 in the ring 25 forming afeature of the mounting-member. Furthermore, by locating the locking-member 42 in thetang 32 in position to be retracted by inclined surfaces inthe respective opposite walls ofthe said'coupling-groove 27, I not only provide a convenient and compact ar-` rangement of parts but assure the `uniform retraction of the saidlocling-member and avoid any appreciable cramping action thereupon, so that the die-head remains sensitive to relative forward drafts exerted by the work upon the Chaser-carrying member to effect the tripping of the die-head. f

It will be understood by those skilled in the art that my invention may assume varied physical forms without departing from my inventive conceptand I, therefore, do not limit myself to the specific embodiment herein chosen Afor illustration, but only as indicated in the appended claims.

" lv claim: i

l. In a pull-off die-head, the combination with a mounting-member formed with a forwardly-facing diametrical coupling-groove 'provided in each'of its respective opposite side walls with a`forwardly-and-inwardly-' inclined'shouldergof a Chaser-carrying memberv carried by the said mounting-member with capacity for relative axial sliding movement with respect thereto and provided with a 7earwardlyi-eXtending coupling-tang Yhaving sliding 'engagement with the'walls of the forwardly-facing diametrical couplinggroove in the saidmounting-member; chasers mounted 1n the saidchaser-carrymg `member a Chaser-operating member operatively Y engaged with the said chasers'fo'r controlling the same and formed with a locking-y shoulder; and a locking-member mounted in ing member in position'tolengage the lock- `die-head as yabove .de-

described; or, if desired, the resetting-armr ing-shoulder of the said''Chaser-operating f member and Vhaving eachl 'of itsoppositeends .mounting-membe Y 2. A pull-off die-head as set forth in claim l and having-the said locking-member bearing at its respective foppositefends against the side-walls of the coupling-groove in the" said' mounting-member vand provided at each of its opposite ends with an `loffsettingrib engaging the inclinedshoulders in thesaid coupling-groove. Y j j 3. A pull-off die-head as set forth in claim land having the, coupling-tang ofthe 'chasercarrying member formedwith two iiatf faces and two concentric convex-,faces and having a transverse notch formed in one of the saidy convex faces and opening through the'complementary iat side-faces to provide a guideway for the said locking-Ii'iember.v Y 1 Y 4. In a pull-offdie-headhecombination with amounting-member formed with a for-f` wardljy'f-facing Vdiametrical coupling-groovek Vprovidedin each of its respective opposite ception of the guide-sleeve of the said mounting-member and provided with a rearwardly-eXtending coupling-tang also slidingupon' the said guide-sleeve and having sliding engagement withr'the walls of Vthe forwardlyl facing diametri'cal couplinggroove in th'esaid mount-in(gy-member;v chasers mounted in the said Chaser-carrying member; a chasers-operating member operatively en'gaged' with the said chasers 'for controlling they same and formed a locking-shoulder; anda locli-V ing member mounted in the-coupling-tang of the said vChaser-carrying member 1n position to engage the locking-shoulder of the said' yChaser-operating member and having,

sidewalls with 'a forwardly-and-rearwardly-v each of its opposite ends engaged respective-l lyrvvith the inclined-shoulders in the cou-` pling-groove of the said Vmounting-member. 5. In a pull-off die-head, the combination with the complementary mounting-member and Chaser-carrying member' thereof, ,one ofthe-said members beingformed with a dial metrical coupling-groove .providedl in each of its respective opposite side walls with an member operatively lengaged'withl the .said chasers fori-controlling the same and formed` with a locking-shoulder; anda locking-member mounted yin 4the coupling-tang of the c, v12o inclined shoulder, andthe other of the said,

aforesaid complementary member so provided in position to engage the locking-shoulder of the said Chaser-operating member, and having each of its opposite ends engaged respectively with the inclined shoulders ,in lhe coupling-groove in the 'other of the said complementary members.

In testimony whereof, I have signed this specification. i

ROYCE M. STRICKLAND.

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