US 2297070 A
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Description (OCR text may contain errors)
, with respect to the tape is assured and wherein with respect to the a vide a method and apparatus for forming intertapes with respect Patented Sept. 29,1942 I I 2,297,070
UNITED" STATES tP-A Nr OFFICE I snmnr'ns'rnzc il mnbrscruas v Noel J. roux, Mearlville, Pa, assignor to Talon,
Inc., a corporation of Pennsylvania Application December 13, 1939, Serial No. 309,015
1 Claims? (c1. a-so) This invention relates to slide fasteners and, edge and, in some cases, in
in particular, to the forming of interlocking fas-. in-impact upon the tape. The introduction of tener members directly upon fastener stringer material inthis direction toward'the tape edge tapes. upon which the members were formed exerted It is an object of this invention to provide an 5 against the stringer tapes projecting into the die improved method of forming or casting intercavity, forces tending to push the tapes from locking fastener members directly upon fastener the dies and, prevent sufiicient extension of the stringer tapes, wherein the concentric location tapes into the formed elements, or to throw the of the formed interlocking fastener members head or reinforced stringer tape edges ofi center die cavities with .resultant ons of the interproduction thereon of fastener members having quick shots resulting the head or interengaging .porti locking fastener members are formed by comleg portions of non-uniform thickness.
pletely closed die surfaces preventing the forma- Furthermore, the formation of gates, sprues tion of flash, sprues or gates on these portions and flash on the head portions or interengagingof the fastener members. portions of the fastener members were generally incident to these methods wherein the material was supplied under pressure causing it to move locking fastener members directly upon stringer into the die cavity in this direction toward the tapes wherein proper alignment of the stringer vtape edge upon which the fastener member was to the dies is readily accome 29 to be formed in the die cavity.
By utilization of the principles of this invention wherein the fastener member forming material is supplied equally at opposite sides of the It is a further object of this invention to protapes and directed toward the heads or intervide such amethod and apparatus wherein the looking portions of the fastener members to be die opening is disposed at the rear of the leg porformed in the general direction of the extent of tions of the formed fastener members and wherev the tapes toward the enclosed edge portions, all in the formation of gates and sprue's on the head 'of the above disadvantages are totally obviated portionsistotally obviated. and certain other advantages achieved, as will These and other objects and advantages of the 30 hereinafter appear. The direction in which the invention will appear from the following descripmaterial is supplied tothe die cavity causes the tion taken in conjunction with the accompanying material to guide and maintain the edge of the drawing which forms apart thereof, and will stringer tape in a position concentric of the die be pointed outinthe appended claims. cavity, while urging the edge of the stringer tape In the drawing: 35.into the die cavity rather than in an opposite It is a further object of this invention to proplished and assured by the manner in which the. fastener member forming material is fed to the dies.
Fig. 1 is a side elevation of one form of apdirection, thus tending to stretch the portions paratus for accomplishing the objects of this of the stringer tape upon which the fastener members are formed and securing absolute coninvention; and a F 2 is a Section taken S s al y on the centric alignment of the formed fastener memline 2 2 Of F g- 40 bers with respect to; the stringer tape.
Former methods of forming the interlocking v In the illustrated form of apparatus for carryfastener members'of slide fasteners directly upon ing out the invention, the base I l which is adaptthe slide fastener stringer tapes utilized dies pro ed for attachment to any suitable table or other vided with slots accommodating the edge porsupport is provided with a longitudinal die suptions of stringer tapes and having openings porting channel l2 of substantially rectangular spaced from the extreme edge of the stringer section, Drive means, such as the power driven tapes, within the die, for receiving fastener memroller l4, communicates with the bottom of the her forming material. The material which was, longitudinal channel 12.
either metal in molten condition or heated nonsuperposed upon the base II is a casing l5. metallic resinous or p i mater al Was pp ie This casing l5'is provided at its upper end with to therinterior of the die under extreme pressure a detachable coverplate l6 which is removable directed toward the enclosed tape edge from for placing material in the charging cylinder l1 points spaced from the enclosed tape edge in a which leads downwardly from the upper end of direction generally opposite the direction in the casing I5.
I This charging cylinder I1 is prowhich the tape extended from the enclosed tape, vided with a charging ram or piston 18 fitting closely to the walls of the charging cylinder ll be seen in Fig. 2, while the material is delivered and provided with a piston rod l3, by means of to each die cavity in a direction toward the front which pressure may be applied to the piston l8. or head portion 4| from the rearor leg end 42 An annular'chamber 20 in the wall of the of each fastener member 43. charging cylinder ll encloses a suitable heating 5 As the die 33 is moved progressively from left coil 2|, by means of whichthe material in the to right, as seen in Fig. 1, the forward reduced charging cylinder l3 may be heated. The terend of each recess 23 exerts a packing effect upon minals 22 and 23 of this'coil 2| may be attached the material in each die cavity 31 moving out of r to any suitable source of electric energy for heatcommunication with the recesses 23, which is ading the coil 2i. 1o ditional to the pressure exerted throughout the The lower wall of the charging cylinder I1 is fastener forming material by the ram or piston formed by a plurality of substantially frustol8. The forward edge of each recess 28 acts as a conical depressions 24 which are separated by a scraper or knife which fits closely to the upper wall 23 provided with a vertical longitudinally surface of the die 33 and thus scrapes oil. the disposed stringer tape guiding channel 23. The material beyond the end of the die cavity to prechannel 28 extends from side to side of the casvent the formation of gates, sprues or flashes on ing it. The frusto-conicaldepressions 24 comthese surfaces. Any roughness in the finished municate at their lower ends with the charging fastener members will, however, occur at the material leads 2'! which are progressively reduced rear surface of the leg portions 42 thereof, as will from their upper to their lower ends and which 2 beclearly understood. As these surfaces, in use, are inclined downwardly and inwardly from the are in communication with the lateral flange lower ends of the frusto-conical depressions 24, surfaces of the fastener slider, this roughness, if as shown in Fig. 2. The leads 21, at each side of existent, is removed by use of the fastener. While the wall 23, communicate with amold cavity suponly a short length of die 33 is shown, it is,,of
ply recess 23 immediately above the longitudinal 25 course, to be understood that the same may be die supporting channel l2. as shown in Fig. 2. made of substantial length and that the form The cavity supply recesses 28 have arcuate upper thereof may be substantially varied, as desired. surfaces and the cross sectional area is progres- The operation of the above-described apparatus sively reduced in the direction of travel of the is as follows. The righthand end of the multiple stringer tape through the casing l5, as shown in 30 cavity die 33 is inserted in the longitudinal die Fig. 1. supporting channel I 2 and the die is moved right- In order that fastener member forming matewardly, as seen in Fig. 1, until the first cavity 31 rial such as molten metal or moldable plastic is adjacent .the termination of the recesses 28 at 7 material, heated in the charging cylinder l1 and the right. A length of stringer tape is inserted placed under pressure therein by the piston i8, 35 in the stringer, tape guide channel 28 and may be maintained at a desired controlled temthreaded therethroughuntil the righthand end perature until placed in the die cavities, the leads thereof is engaged by the stringer tape supporting 21 are heated by a heating coil 23 disposed in means (not shown). Interlocking fastener memthe chamber 33 surrounding the leads 21, as her forming material, either plastic or metal, is
shown. The terminals 3| and 32 of the coil 23 placed in the charging cylinder H. are connected to any suitable source of electrical The material may be heated to the desired energy (not shown) and it is. of course, to be temperature before being placed in the charging understood that the temperature of the coils 2| cylinder I! or the temperature thereof may be and 23 will be carefully controlled in known manraised to the desired point y he h n 11 ner within predetermined desired limits in order n either ca e eati g coil 21 is heated that the fastener member forming material shall in order that the inner surfaces of the frustobe delivered to the mold cavity supply recess 28 in conical depressions 24 and leads 21 may be predetermined desired condition. brought to the desired temperature, preferably Supported by the power driven roller H for before the material is inserted in the charging longitudinal movement in the longitudinal die cylinder I1, supporting channel I2,'in the direction indicated Constant desired pressure is then applied to in Fig. l, is a two-part multiple cavity die 33 in the piston rod l3 to operate the ram or piston the form of a pair of complementary die plates I 3 and cause the die cavities 31 below the re- 34 and 35, in each of which is formed a part of cesses 28 to be charged. Thereafter, the power the die cavity 31 and which are removably secured driven roller I4 moves the multiple cavity die together by any suitable means, such as screws 3 rightwar ly, as n in Fi 1, in the longi- 33. Each of the die cavities 31 is, of course, comtudinal die supporting channel l2, while conplementary to the form of the fastener members stant. pressure 011 the P s d 9 is a ndesired to be formed or cast upon the reinforced tained, until the material in the charging cyledge of the stringer tape 38, which stringer tape indcr I1 is exhausted or until the left end of 38 is supported, by means not shown, for longithe multiple cavity die 33 is reached. Suitable tudinal movement concurrently with the die 33 m ans may be provided, if desired, for cooling in a manner which will be readily understood. those Portions of the multiple cavi y die 33 118- As will be seen from Fig. I, the pair of cavity p d ri h wardly of the casing l5, as seen in supply recesses 28 communicate with a. plurality Fig. 1- of die cavities 31 at opposite sides of the tape 38 After the cavities 31 in the multiple die' 33 at a pointspaced from the reinforced edge 33 have been filled, the multiple cavity die 33 is thereof and these recesses 28 function as jets removed from the channel l2 and the members to direct the fastener member forming material 34 and 35 thereof released from one another. (which is heated and under substantial pressure) 7 hereafter, the die members 34 and 35 are sepaconvergently inwardly toward the tape and in a, rated and the slide fastener stringer will then direction toward the reinforced edge 33 thereof. be in finished form comprising the stringer tape The interlocking fastener members 40 formed in 38 havin completely finished n o n fasthe die cavities 31 thus have the head portions 4i tener m m s 0 c st p n th nf d d thereof formed'by continuous die surfaces, asmay portion 33 thereoLas will be clearly understood.
ities being open otherwise In order automatically between successive rows of predeter- 31 may be omitted at predetermined intervals, or as an alternative, predeterminedly spaced groups of these die cavities 31 may be filled temporarily with suitable material preventing the entrance of fastener member forming material during continuous operation of the die 33.
It is, of course, to above description nowise limiting and that I desire to comprehend within my invention such modifications as are included in the scope of the following claims.
Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:
1. In a method tener .stringers by injection comprising enclosing one edge portion of a stringer tape in a mold cavity opening through a mold wall and of form complementary to the form of an interocking fastener member having a head portion and tape engaging leg portions be understood that the of manufacturing slide fasmolding, the steps extending rearwardly from said head portion,
said mold being open only at those portions corresponding with the rear surfaces of the leg portions of the fastener member, and supplying fastener member forming material through said mold cavity openings in said mold wall toward the enclosed tape edge to fill the mold cavity.
2. In a die for use in forming fastener members by indection molding directly upon slide fastener stringer tapes, a die body, a longitudinal stringer tape edge receiving channel extending inwardly of the die body from one surface of the die body, and a plurality of die cavities communicating with said channel and opening otherwise only at opposite sides of to produce gap spaces fastener members is merely illustrative and in pressure to said delivery'leads, and
interlocking said tape edge receiving channel through said surface of the die body.
3. A die for use for forming interlocking fastener members by upon slide fastener stringer tapes'including a plurality of detachable elongated die parts having therein complementary recesses forming multiple die cavities complementary with the form of finished fastener members having interlocking head portions and tape engaging leg portions extending rearwardly from said head portions, said -die parts being provided with a connecting stringer tape edge receiving channel connecting the portions of said cavities corresponding with said leg portions, said die cavonly at each side of said channel, at the portions corresponding with the rear surfaces of the leg portions of the fas-' tener members, said die cavitiesand said channel opening through a common die wall and the interior of said cavities providing continuinjection molding directly 7 municating progressively tape edge rec temperature of plementary with the interlocking fastener members tolbe formed and having gates at each side of said tape edge receiving channel andextending through the same die wall, said gates comwith said delivery leads upon movement-of said .die'for receiving therefrom material under pressure for filling said cavities and forming spaced interlocking fastener members directly upon fastener stringer tapes in said channels.
5. In apparatus for forming interlocking fastener. members by injection molding directly upon slide fastener stringer tapes, means delining at least one pair of laterally space verging fastener member forming livery leads and an ly'movable die means having therein a eiving channel communicating with said tape guide channel and parallel, thereto, said tape edge receiving channel havinz 8111 die cavities extending therefrom the die, said die cavities being complementary with the interlocking fastener members to be formed and having fastener member forming material receiving openings at each side of said tape edge receiving channel, said openings and directly upon fastener stringer tapes in said channel.
6. In apparatus for forming interlocking fastener members directly upon slide fastener stringer tapes by injection molding, means defining at least one pair of laterally spaced converging frusto-conical fastener member forming material delivery leads and an intermediate longitudinal string r tape guide channel, associated heating co means for controlling the the material in said delivery leads, means for supplying fastener member forming material under pressure to said delivery leads, and longitudinally, movable die means having a longitudinal stringer tape edge receiving channel communicating with said tape guide cos fastener member head portion forming surfaces.
4. Inapparatus for forming interlocking fastener members by injection molding directly upon slide fastener stringer tapes, means defining at least one pair of spaced fastener ,member forming material delivery leads and an intermediate stringer tape guide channel, means for supplying fastener member forming material under pressure to said delivery leads, and movable die means having a stringer tape edge re-v ceiving channel *with spaced diecavities connected thereby and extending therefrom inwardly of. the die, said die cavities being com- 'ing material, at least one channel and complementarytherewith to enclose a stringer tape, said die having spaced die cavities extending from said tape edge receiving channel inwardly of said die, said die cavities being complementary with the form of interlocking fastener members to be formed and hav-'- ing fastener member forming material receiving gates at each side of said tape edge receiving channel, sa'd gates and said channel extending through the same die wall and and communicating progressively with said delivery leads upon movement of said die for receiving mate? rial therefrom under pressure for filling said cavities and forming spaced interlocking fastener members directly upon fastener stringer tapes in said channel.
,7. In apparatus for forming interlocking fastener members directly upon slide fastener stringertapes by injection molding, a charging cylinder for containing fastener member formpair of converging delivery-leads extending-from said charging cylin'der, means associated-with said cylinder for forcing material therefrom through said coninwardlyof extending through the same die 7 wall and said openings communicating progres- -sively with said delivery vergIngleadsQ astringer tape u ding channel iastener members,
intermediate each pair 01' converging leads'and accommodating the major portionof thewidth of a stringer tape, a die movable withrespect to said leads and having therein a stringer tape edge receiving" channel parallel to said stringer tape guiding channel and complementary therewith'ior enclosing the entire" tape width, said die having predeterminedly spaced die cavities complementary in form, to finished interlocking 10 said die cavities extending ass-2507c said tape edge receiving die wall and said 0 from said stringer tape, edge receiving channel and having continuous iastener member head forming surfaces andiastener member iorming material receiving openings atopposite sides oi channel, said channel and said openings extending through a common gs progressively communicating with said leads upon movement of said die.
g e NOEL J. POUX.