Continuous plastic strip for use in manufacturing insulative housings in electrical connectors

Abstract: Disclosed is a plastic strip for use in the manufacture of unshrouded insulative housings for electrical connectors. The strip is comprised of an elongated body (62) having a first and a second end and adjacent the first end there is a cavity (64) for receiving a polymeric molding compound (82). This cavity allows the strip to be attached end to end a second subsequently formed axially aligned plastic strip (84) to allow for the continuous manufacture of such strips. The strip also includes a plurality of axially spaced apertures (66,68,70,72,74,76) for receiving pins or other conductive elements.

Description: 1. Field of the Invention: The present invention relates to a plastic strips for use in the manufacture of unshrouded insulative housings for electrical connectors, according to the precharacterising part of claim 1 and to a method for manufacture a plastic strip used in the manufacture of unshrouded insulative housings for electrical connectors. 2. Brief Description of Prior Developments: It has been suggested that the use of pin header connectors in continuous reel form might be desirable due to lower costs of assembly and inventory. By obtaining headers in strip form and using automated assembly equipment to cut parts to length and place, a manufacturer might be able to significantly reduce inventory requirements. Furthermore, component to circuit board assembly throughput rate might also be improved. The prior art, for example U.S. Patent No. 4,832,622 to Zahn, teaches the use of continuous extrusion plastic strips for producing insulative plastic strips for use in manufacturing unshrouded housings for electrical headers. One drawback, however, to the continuous extrusion of plastic strips for this purpose is that secondary operations may be required to produce the full finished part configuration. For example, it may be necessary to cut lateral notches to serve as points for segmenting the strip into individual insulative plastic strips. It may also be necessary to perforate the strip to provide apertures for the placement of pins or other conductive members in the completed connectors. The aforesaid Zahn patent also suggests that a continuous plastic strip may be manufactured in discrete segments by injection molding. In one proposed mode of manufacturing a continuous plastic strip by injection molding, Zahn teaches the use of a separate longitudinal spline as a carrier for the units to be molded. A disadvantage to this approach may, however, be that the use of the separate longitudinal spline may contribute to the complexity and expense of the overall operation. In another proposed mode, Zahn teaches the sequential molding of discrete units in series without a separate spline. Since, however, no specific means may be disclosed for interlocking the sequentially molded segments, the resulting continuously molded strip may lack the degree of flexibility or strength that would be desirable for certain uses such as being capable of being wound on a reel to extended lengths. A need, therefore, exists for a continuous plastic strip which can be used as or to manufacture an electrical connector housing which does not require expensive finishing operations. A need also exists for such a continuous plastic strip which may be manufactured without a separate longitudinal spline or carrier. A still further need exists for a continuous plastic strip which has the necessary strength and flexibility that would enable it to be wound on a reel at extended lengths to facilitate its subsequent transport and storage. The prior art document DE-A-30 44 851 discloses a method and an apparatus for manufacture profile parts made of plastic in separate dies as the background of the present invention. The prior art documents FR-A-2 389 254 and US-A-4 309 370 are related to a plastic molding apparatus for forming a series of molded connector bodies which are attached to a molded strip segment. By repeating the molding cycle, an additional strip segment is simultaneously molded and joined to a previously made strip segment, so that repeated cycling of the molding machine provides a molded continuous strip interconnecting a series of molded bodies. The EP-A-0 753 901 also discloses a plastic strip used in the manufacture of insulative housings for electrical connectors. Said strip is manufactured by injection molding axial segments in sequence. An in-line interlocking structure is used for interlocking adjacent segments. Said interlocking structure comprises holed end units nested together within an over molded leading end unit. It is a disadvantage of the continuous molded strip that the interlocking structure does not provide a reliable connection between the successively molded segments. Thus, the disconnected continuous strip has to be reconnected during manufacture which is a time-consuming and expensive process. It is therefore the problem of the present invention to provide a continuous plastic strip used in the manufacture of unshrouded insulative housings for electrical connectors which is made of reliably connected segments. It is a further problem of the present invention to provide a method for manufacture said plastic strip. The above problems are solved by the subject matter of independent claims 1 and 11. Particular embodiments of the invention are the subject of the respective dependent claims. Summary of the Invention The plastic strip of the present invention comprises an elongated body having a first and second end, and adjacent the first end there is a cavity for receiving a polymeric molding compound. A plurality of conductive member receiving means are spaced at intervals between the cavity and the second end. Preferably the cavity is connected to the first end by a recess, groove or slot to allow molding compound to be easily conveyed from the first end into the cavity. Preferably the molding compound receiving cavity is an aperture extending transversely through the plastic strip. More preferably, the cavity comprises a pair of parallel transverse apertures connected by a pair of axial grooves. Also encompassed within the present invention is a plastic strip for use in manufacturing unshrouded insulative housings for electrical connectors which comprises of elongated body which is formed of two separate polymeric sections. These separate sections are formed by separate shots or injections of a polymeric molding compound during an injection molding process. Typically these first and second polymeric sections will be axially aligned and over the length of the strip there will be a plurality of axially spaced conductor member receiving means. Also preferably, the second polymeric section fills a generally cylindrical shaped space which extends transversely across the plastic strip. More preferably, there can be two generally cylindrically shaped spaces which are connected by a bridge, or still more preferably two bridges positioned and spaced superimposed relation. The conductive member receiving means would preferably be a pin receiving aperture which also extends traversely across the plastic strip in concentric arrangement with one of the transverse cylindrical spaces. In a single pin row arrangement the two generally cylindrically shaped spaces are arranged in axial relation and the bridges would extend axially between them. In a row arrangement four cylindrically shaped spaces could be used. In such an arrangement there are two pairs of spaces in side by side relation and bridges would convert the cylindrically shaped spaces. The present invention also encompasses the method for continuously manufacturing an insulative plastic strip for an unshrouded insulative housing electrical connector comprising the steps of first providing an elongated mold for forming a length of the plastic strip. The mold has a first and second opposed ends, and adjacent said first section there is a means for forming an end cavity in said length of plastic strip. At spaced intervals there are means for receiving a conductive element. The elongated mold is then filled with a polymeric molding compound, and the molding compound is allowed to harden to form a first length of plastic strip. A cavity is formed in this length adjacent the first end and a plurality of spaced conductive element receiving means are also interposed between the first and second ends of the mold. The first length of plastic strip is then partially displaced from the second end of the mold. The cavity remains in the mold, and the mold is again filled with the polymeric molding compound. The molding compound is then allowed to harden to form a second length of plastic strip contiguous with said first length of plastic strip. This second length of plastic strip is also allowed to harden and the process is repeated until the desired amount of plastic strip is produced. Brief Description of the Drawings The insulative connector plastic strip of the present invention and plastic strip of its manufacture is further described with reference to the accompanying drawings in which: Figs. 1a-1f are top plan schematic views of a mold for use in the plastic strip of the present invention and a continuous plastic strip produced by the plastic strip of the present invention; Fig. 1g is an enlarged view of area Ig in Fig. 1a; Fig. 1h is a cross sectional view through Ih - Ih in Fig. 1g; Fig. 2 is a top plan view of a portion of a continuous plastic strip representing a preferred embodiment of the present invention; Fig. 3 is a side elevational view of the plastic strip shown in Fig. 2; Fig. 4 is a cross sectional view through IV - IV in Fig. 2; Fig. 5 is a cross sectional view through V - V in Fig. 2; Fig. 6 is an enlarged view of the area within VI in Fig. 2; Fig. 7 is a perspective schematic view of a portion of the strip header shown in Fig. 7a during a subsequent step in the manufacture of the plastic strip of the present invention; Fig. 8 is a top plan view of a portion of the plastic strip similar to Fig.2 on the completion of a subsequent step in the process of its manufacture; Fig. 9 is a cross sectional view through IX - IX in Fig. 8; Fig. 10 is a cross sectional view through X - X in Fig. 8; Fig. 11 is a perspective view of the strip shown in Fig. 8 as emplaced on a reel; Fig. 12 is a detailed view of the area within circle XII in Fig. 11; Fig. 13 is a is a top plan view of a portion of a continuous plastic strip representing an alternate preferred embodiment of the present invention; Fig. 14 is a side elevational view of the continuous plastic strip shown in Fig. 13; Fig. 15 is a cross sectional view through XV - XV in Fig. 13; Fig. 16 is a cross sectional view through XVI - XVI in Fig. 13; Fig. 17 is an enlarged view of the area within circle XVII in Fig. 13; Fig. 18 is a top plan view of a portion of a plastic strip similar to the plastic strip shown in Fig. 13 on the completion of a subsequent step in the process of its manufacture; Fig. 19 is a cross sectional view through XIX - XIX in Fig. 18; Fig. 20 is a cross sectional view through XX - XX in Fig. 18; Fig. 21 is a cross sectional view through XXI - XXI in Fig. 18; Fig. 22 is a perspective view of the continuous plastic strip shown in Fig. 18 as emplaced on a reel; Fib. 23 is a detailed view of the area with circle XXIII in Fig. 22; Fig. 24 is a fragmented top plan view of an electrical header which may be manufactured from the plastic strip shown in Fig. 11; Fig. 25 is an end view of the electrical header shown in Fig. 24; Fig. 26 is a fragmented top plan view of an electrical header which may be manufactured from the plastic strip shown in Fig. 22; Fig. 27 is an end view of the electrical header shown in Fig. 26; Fig. 28 is a fragmented side elevational view of the electrical header shown in Fig. 26; and Fig. 29 is a fragmented perspective view of the continuous header shown in Fig. 26 as emplaced on a reel. Detailed Description of the Preferred Embodiments Referring to Figs. 1a - 1f, a mold used in the plastic strip of the present invention is shown generally at numeral 10. This mold includes a base wall 12, and, as is conventional, an upper wall (not shown) in opposed relation to the base wall. As is also conventional, the mold would include side walls 14 and 16 and a molding compound receiving space 18 formed between the side walls and the base and upper walls. As is conventional, molding compound would be introduced into mold space 18 through a gate 20 which is connected to a runner (not shown). A plurality of projections as at 22 and 24 extend respectively from side walls 14 and 16 into space 18. The mold also has a first end 26 and a second article output end 28, and adjacent the first end there is a major cavity producing body 30 which extends upwardly from the base 12 into the space 18. Also projecting from the base 12 into space 18 there are at regular intervals pin opening producing projections 32, 34, 36, 38, 40 and 42. The major cavity producing projection 30 includes cylindrical sections 44 and 46. Referring particularly to Figs. 1g - 1h, between the first end of the mold and cylindrical section 44 there is an upper projection 48 and a lower projection 50 in the body 30. Similarly between cylindrical sections 44 and 46 there is a top medial bridge 52 and a lower medial bridge 54. To the interior side of cylindrical section 46 there is a top interior projection 56 and lower interior projection 58. Referring particularly to Fig. 1b, the mold described above is initially filled with a suitable polymeric molding compound 60. This molding compound is preferably a wholly aromatic thermoplastic polymer and more preferably a mineral-filled liquid crystal polymer such as DUPONT ZENITE 6330 which is a 30% by weight mineral filled liquid crystal polymer. Other suitable polymeric molding compounds would include polyamides, polyesters, polyolefins, polycarbonates, polyketones and polyphenylenes, especially polyphenylene sulfides. The molding compound selected would preferably have a tensile elongation of from 1 percent to 20 percent. The molding compound selected would also have when cured, as will be apparent from the following disclosure, requisite stiffness to maintain spacing for pin insertion and have a flexural modulus of from 20,7·10 8 Pa (300,000 psi) to 17,25·10 14 Pa (2,500,000 psi). Particularly for applications in which high temperature capabilities are desired, a mineral-filled polymeric molding compound might be selected. Referring to Fig. 1c, after the molding compound introduced to the mold in Fig. 1b hardens, a first strip length 62 is displaced toward the second or output end of the mold. This first strip length will have a major end cavity 64 which remains inside the mold and a plurality of pin receiving cavities 66, 68, 70, 72, 74 and 76. A plurality of side cavities as at 78 and 80 are also formed in this first strip length. Referring particularly to Fig. 1d, molding compound 82 is again injected into space 18. It will be appreciated that this molding compound also enters major cavity 64 in first strip length 62. Referring to Fig. 1e, after the molding compound 82 hardens, a second strip length 84 which is contiguous with and connected to strip length 62 will be formed. This strip length will itself be displaced from the second output end of the mold. Referring to Fig. If, it will be seen that a major cavity 86 will be formed in the second strip length 84, and that this major cavity will remain in the mold. Similarly pin receiving cavities as at 88 and side notches as at 90 will also be formed in the second strip length. Although not shown in the drawings, molding compound will again be introduced to space 18 and to major end cavity 86 of the second strip length. Still another strip length will be formed as a result, and that strip length will be displaced from the second output end of the mold, after which still more molding compound will be injected into space 18 and the major end cavity of the strip length to form still another strip length. Referring to Figs. 2 - 6, the continuous plastic strip includes filled segments as at 92 each of which has a pin receiving cavity 94 and spacers as at 96. These continuous strips also include lateral notches as at 98 and 100. These notches serve as point where the plastic strip may be segmented to form individual connector housings. Those notches also contribute to achieving the necessary flexibility in the strip so that it can be wound on a reel as will be explained hereafter. The continuous strips also include an end section shown generally at numeral 102 which are made up of unfilled sections 104 and 106 which have a central major cavity shown generally at 108. This major cavity has two generally cylindrically shaped apertures 109 and 110 which are connected by upper medial recess 111 and lower medial recess 112. These upper and lower medial recesses are separated by bridge 113. Aperture 109 also has a connecting upper lateral recess 114 and a lower lateral recess 115 which are separated by tongue 116. Aperture 110 has a connecting upper lateral recess 117 and a lower lateral recess 118 which are separated by bridge 119. It will be appreciated that lateral recesses 117 and 118 and medial recesses 111 and 112 serve to convey melted molding compound from the end of the strip respectively into apertures 109 and 110. The strip will preferably have a height of from 2,54·10 -3 m - 1,27·10 -2 m (.100 inches to .500 inches). Its width will preferably be from 1,27·10 -3 m - 1,27·10 -2 m (.050 inches to .500 inches). Referring particularly to Fig. 6, the notches preferably have an angular width a of from 10° to 75° and have a depth of from 10 percent to 40 percent of the width of the strip. Referring particularly to Fig. 7, the position of the end section after the first strip length has been displaced from the second end of the mold is shown. It will be seen that pin projection producing projections as at 40 and 42 extend upwardly into the two apertures 109 and 110 respectively to the unfilled segments 104 and 106. After the first strip has been partially displaced from the mold through the second end, the major cavity is filled with a second shot or injection of molding compound. This procedure is then repeated until the desired length of the continuous strip is achieved. Preferably the finished continuous strip would be from 1,524 m - 1,524·10 3 m (5 feet to 5,000 feet) in length. From the above description it will be appreciated that the strip of the present invention may be considered to be characteristically comprised of an elongated body which is formed of separate sections of polymeric molding compound. Referring to Figs. 8 - 10, the strip having an insulated body is shown generally at numeral 128. This strip includes segments 130, 132, 134, and 136. These segments have central pin receiving apertures respectively at 138, 140, 142 and 144. The strip also has lateral notches as at 146 and 148 and spacers as at 150 and 152. The insulative strip also includes a first polymeric section shown generally at 154 which is formed from a first shot or injection of a polymeric mold compound. Axially aligned with the first polymeric section is a second polymeric section shown generally at numeral 156 which is formed from a second subsequent shot or injection. This second polymeric section occupies, in part, a first generally cylindrically shaped space 158 and a second generally cylindrically shaped space 160 which are positioned transversely across the height of the strip in parallel relation. It will be understood that these generally cylindrically shaped spaces may be cross sectionally octagonal or hexagonal or any other regular figure and the term "generally cylindrical" will be understood to include such embodiments. These transverse generally cylindrical shapes are connected by an upper axial bridge 162 and a lower axial bridge 164 which also form part of the second polymeric section 156. Interposed between this upper and lower axial bridge there is a first section fill 166. In opposed relation to the axial bridges there is on the transverse cylindrical shaped base 158 and upper axial tongue 168 which is superimposed over a lower axial tongue 170 and which is spaced from that lower axial tongue by a first section fill 172. In opposed relation to the axial bridges on the transverse cylindrical shaped space 160 there is an upper axial tongue 174 which is superimposed in spaced relation to a lower axial tongue 176 and which also make up part of the second polymeric section. The axial tongues 174 and 176 are separated by a first section fill 178. Referring to Figs. 11 and 12, the continuous strip 128 may then be wound on a reel 180 for storage or transportation. The reel should be of a sufficient diameter so that a permanent curvature in the plastic strip will not result. Preferably the reel will have a 2,54·10 -1 m (10 inch) inner diameter and more preferably a 5,08·10 -1 m (20 inch) inside diameter on which a continuous strip having a preferred length of from 30,48-152,9 m (100 feet to 500 feet)would be wound. Referring to Figs. 13 - 17, it will be seen that the steps described above may also be used to make a plastic strip for a two pin row header. The continuous strip includes filled segments as at 192 each of which has a pair of pin receiving apertures 194 and 195 and spacers as at 196. This continuous strip also include notches as at 198 and 200. The continuous strip also includes an end section shown generally at numeral 202 which are made up of unfilled sections 204 and 206 which have a central major cavity shown generally at 208. This major cavity has four apertures 209, 210, 211 and 212 which have lateral bridges 214, 215 and 216 and tongues 218 and 219. The strip will preferably have a height of from 1,27·10 -3 - 1,27·10 -2 m (.050 inches to .500 inches). Its width will preferably be from 2,54·10 -3 - 1,27·10 -2 m (.100 inches to .500 inches) Referring particularly to Fig. 17, the notches preferably have an angular width b of from about 10° to 75° and have a depth of from 10 percent to 40 percent of the width of the strip. Referring to Figs. 18 - 21, the process of making the continuous strip shown in Figs. 13 - 17 is further illustrated. It will be appreciated that these figures are analogous to the part of the plastic strip shown above in Figs. 8 - 9. It will also be appreciated that the strip with two rows of pin apertures may also be considered to be characteristically comprised of an elongated body which is formed of separate sections of polymeric molding compound. Referring to Figs. 18 - 20, the two row strip having an insulated body is shown generally at numeral 328. This strip includes segments 330, 332, 334, and 336. A first lateral row of pin receiving apertures on these segments is shown at 337, 338, 339 and 340. A second lateral row of pin receiving apertures is shown at 341, 342, 343 and 344. The strip also has lateral notches as at 346 and 348 and spacers as at 350, 351 and 352. The insulative strip also includes a first polymeric section shown generally at 354 which is formed from a first shot or injection of a polymeric mold compound. Axially aligned with the first polymeric section is a second polymeric section shown generally at numeral 356 which is formed from a second subsequent shot or injection. This second polymeric section occupies, in part, a cylindrical shaped spaces 358, 359, 360 and 361 which are each positioned transversely across the height of the strip in parallel relation. The transverse generally cylindrical shapes on opposite sides of the strip are connected by an upper axial bridge as at 362 and a lower axial bridge as at 364 which also form part of the second polymeric section 356. Interposed between this upper and lower axial bridge there is a first section fill as at 366. Between the cylindrical spaces 359 and 360 and cylindrical spaces 361 and 362 there is an upper axial bridge 368 and a lower axial bridge 370 both of which are part of the second polymeric section. Referring to Figs. 22 - 23, the continuous strip 328 may then be wound on a reel 480 for storage or transportation. Preferably the reel will be at least a 2,54·10 -1 m (10 inch) and more preferably a 5,08·10 -1 m (20 inch) diameter reel on which a continuous strip having a preferred length of from 30,48 - 152,4 m (100 feet to 500 feet)would be wound. Referring to Figs. 24-25, a single pin row continuous strip with pins in place is illustrated. This strip 436 has notches as at 438 and 440 and spacers as at 442 and 444. Pins as at 446 and 448 may be inserted in any conventional way. Referring to Figs. 26-29, a continuous strip with pins in place is illustrated. This strip 536 has notches as at 538 and 540 and spacers as at 542 and 544. Pins as at 546 and 548 may be inserted in any conventional way. Referring particularly to Fig. 29, the continuous strip 536 with pins emplaced may then be wound on a reel 680 for storage or transportation. Preferably the reel will be at least a 2,54·10 -1 m (10 inch)and more preferably a 5,08·10 -1 m (20 inch) inner diameter reel on which a continuous strip having a preferred length of from 30,48 - 152,4 m (100 feet to 500 feet)would be wound. Ordinarily these reels would be transported to the site of an electronic manufacturer's assembly operation. The manufacturer would then segment the strip at appropriate notch positions to obtain headers of a desired length. Preferably the strip would be segmented by cutting it in any conventional means such as with a band saw or with opposed blades in a scissors or guillotine like action. Preferably such segmentation would be integrated with other electronic assembly operations so that a header would be cut from a reeled strip just prior to the placement of the header on a printed wiring board. Example 1 A mold was constructed to produce an insulative strip similar to that shown in Fig. 2. The strip was 2,54·10 -3 m (.100 inches)in height and 2,413·10 -3 m (.095 inches)in width. Notches were separated by 2,54·10 -3 m (.100 inch) and were 7,112·10 -4 m (.028 inch) in depth and had an angular size of 54°. The length of the strip in the mold was 9,144·10 -2 m (3.60 inches). The molding compound used was DUPONT ZENITE 6330 (black), a wholly aromatic liquid crystal polymer. The length of the strip in the mold was 9,144·10 -2 m (3.60 inches). The tensile elongation of the molding compound was 4 percent and its flexural modulus was 14,49·10 9 Pa (2.1 million psi). The mold was filled with the molding compound, and a first insulative strip was produced. Mold temperature was 71°C (160°F) and nozzle heater temperature was 349°C (660°F). As was described above, this strip was displaced from the second end of the mold, and the mold was again filled with molding compound while the cavity in the first strip was engaged with the molding compound. Strips were continuously produced in the above described manner until an overall length of about 2,4384·10 2 m (800 feet)was achieved. 1,2192·10 2 m (400 feet) of this strip was wound on a 5,08·10 -1 m (20 inch) inner diameter reel. The remainder of this strip was approximately evenly divided and wound on three 5,08·10 -1 m (20 inch)inner diameter reels. Example 2 A mold used to produce an insulative strip similar to that shown in Fig. 13 was made. The strip width was 4,9784·10 -2 m (1.960 inches) and the height of the strip was 2,54·10 -2 m (1.000 inches) The notches were separated by 2,54·10 -3 m (.100 inches) and were 1,9·10 -3 m (.075 inches) in depth and had an angular size of 54°. The molding compound, mold temperature and nozzle heater temperature were the same as Example 1. In the way described above, lengths of plastic strip were continuously produced until a strip of the length of about 2,4384·10 2 m (800 feet) was available. 1,2192·10 2 m (400 feet) of the strip was wound on a 5,08·10 -1 m (20 inch)inner diameter reel. The remaining strip was approximately evenly divided on three 5,08·10 -1 m (20 inch) inner diameter reels. It will be appreciated that a plastic strip and apparatus for economically and efficiently continuously producing an insulative strip for use in manufacturing an unshrouded insulative housing for an electrical connector has been disclosed. While the present invention has been described in connection with the preferred embodiments of the various figures, it is to be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiment for performing the same function of the present invention without deviating therefrom. Therefore, the present invention should not be limited to any single embodiment, but rather construed in scope in accordance with the recitation of the appended claims.

Claims: A plastic strip (128) used in the manufacture of unshrouded insulative housings for electrical connectors comprising: a. an elongated body having a first and a second end; b. a plurality of conductive member receiving means (138, 140, 142, 144; 194, 195); characterized by further comprising c. a cavity (158, 160) adjacent said first end for receiving a polymeric molding compound (82) for attachment to a second strip (156) wherein said conductive member receiving means (138, 140, 142, 144; 194, 195) are interposed at spaced intervals between said cavity (158, 160) and said second end. The plastic strip (128) of claim 1, characterized in that a molding compound conveying means (111, 112, 117, 118) connects the first end of the strip (128) and the cavity (185, 160) for receiving the polymeric molding compound (82). The plastic strip (128) of claim 1, characterized in that the cavity (185, 160) for receiving the polymeric molding compound (82) is a transverse aperture in the plastic strip (128). The plastic strip (128) of claim 3, characterized in that the cavity (158, 160) for receiving the polymeric molding compound (82) is a pair of parallel transverse apertures (158, 160) in the plastic strip (128), which are connected by at least one molding compound conveying means (111, 112, 117, 118). The plastic strip (128) of claim 4, characterized in that there are a first (111) and a second axial molding compound conveying means (112) connecting said transverse apertures (158, 160) and said first conveying means (111) is superimposed over said second conveying means (112). The plastic strip (128) of claim 1, characterized in that the conductive member receiving means (138, 140, 142, 144) are pin receiving cavities. The plastic strip (128) of claim 1, characterized in that said strip (128) is comprised of a polymeric molding compound (82) having a tensile elongation of from about 1 % to about 20 % and that the strip (128) is comprised of a polymeric molding compound (82) having a flexural modulus of from about 20,7 · 10 8 Pa (300,000 psi) to about 17,25 · 10 14 Pa (2,500,000 psi). The plastic strip (128) of claim 7, characterized in that the parallel transverse apertures (158, 160) are connected by first (113) and second axial bridges (119) wherein said first bridge (113) is positioned in spaced superimposed relation over said second bridge (119) and/or that at least one axial tongue (116) projects from each of the parallel transverse apertures (158, 160) in opposed relation to the connecting axial bridge (113, 119) and/or that a pair of transversely spaced axial tongues extend from each of the parallel transverse apertures (158, 160) in opposed relation to the connecting axial bridge (113, 119). The plastic strip (128) of claim 8, characterized in that the plastic strip (128) has a width of from about 1,27 · 10 -3 m (0,05 inch) to about 1,27 · 10 -2 m (0,5 inch) and a length from about 1,524 m (5 feet) to about 1,524 · 10 3 m (5000 feet). The plastic strip (128) of claim 9, characterized in that there are a plurality of lateral notches (100) on the strip having an angular width in particular from about 10° to about 75° and a depth of in particular from about 10% of the width of the strip (128) to about 40 % of the width of the strip (128). A method for manufacture a plastic strip (128) used in the manufacture of unshrouded insulative housings for electrical connectors comprising the steps of: a) providing an elongated mold (10) for forming a length of said plastic strip (128) having a first (26) and second opposed ends (28) wherein adjacent said first end (26) there is a means (30) for forming an end cavity (158, 160) in said length of said plastic strip (128) and at spaced intervals there are means (32, 34, 36, 38, 40, 42) for forming conductive element receiving means (138, 140, 142, 144; 194, 195) in said length of said plastic strip (128), b) at least partially filling said elongated mold (10) with a polymeric molding compound (82) and allowing said molding compound (82) to at least partially harden to form a first length of said plastic strip (128) having a cavity (158, 160) adjacent the first end and a plurality of spaced conductive element receiving means (138, 140, 142, 144; 194, 195) interposed between the first (26) and second ends (28) of the mold (10); c) partially displacing the first length of plastic strip (128) formed in step b) axially from the second end (28) of the mold (10) such that the cavity (158, 160) in the plastic strip length formed in step b) remains in the mold (10); and d) again at least partially filling the elongated mold (10) including the cavity (158, 160) in the plastic strip length formed in step b) with the polymeric molding compound (82) and allowing said molding compound (82) to at least partially harden to form a second length of plastic strip (128) contiguous with said first length of plastic strip (128). The method of claim 11, wherein the mold (10) includes a means for forming an aperture (30) for receiving molding compound (82) in the plastic strip (128). The method of claim 12, wherein the mold (10) includes a means (30) for forming a pair of transverse apertures (158, 160) for receiving molding compound (82) in the plastic strip (128) and wherein the apertures (158, 160) are connected by at least one axial recess (111, 112). The method of claim 13, wherein the apertures (158, 160) are connected by an axial first recess (111) superimposed over an axial second recess (112). The method of claim 14, wherein there is a base wall (12) and a projection (44, 46) extends from said base wall (12) into said molding compound receiving space (18) and comprises a first (44) and a second cylinder (46) wherein at least one bridge (52, 54) connects said first (44) and second cylinder (46), between said first (44) and second cylinder (46) a first bridge (52) being superimposed over a second bridge (54). The method of claim 15, wherein at least one projection extends from said first cylinder (44) toward the first end (26) of the mold (10) and/or wherein at least one projection (48, 50) extends from the second cylinder (46) toward the second end (26) of the mold (10). The method of claim 11, wherein the means (138, 140, 142, 144; 194, 195) for receiving the conducting elements comprise a plurality of conductive element receiving cavities substantially openly spaced on the strip (128). The method of claim 11, wherein the polymeric molding compound (82) is a liquid crystal polymer or wherein the polymeric molding compound (82) is selected from the group consisting of polyamides, polyesters, polyolefins, polycarbonates, polyketones and polyphenylenes. The method of claim 11, wherein the distance from the first end (26) of the mold (10) to the second end (28) of the mold (10) is from about 1,27 · 10 -2 m (0,5 inch) to about 6,096 · 10 -1 m (24 inches). The method of claim 19, wherein the steps are sequentially repeated until an overall strip length from about 1,5 to 4 m (5 feet) to about 1,524 · 10 3 m (5.000 feet) is formed and wherein the plastic strip (128) is wound on a reel having an inside diameter of more than about 2,54 · 10 -1 m (10 inches) and wherein the plastic strip (128) is cut into segments.

Inventors: FACKLER RICKY LEE, GARDNER MELISSA K, HANNA TAJ F, JUGOVICH ANTHONY M, LAROSA CARMEN A, ORTEGA JOSE L, FACKLER, RICKY LEE, GARDNER, MELISSA K., HANNA, TAJ F., JUGOVICH, ANTHONY M., LAROSA, CARMEN A., ORTEGA, JOSE L.
Applicants: FRAMATOME CONNECTORS INT, FCI
Application year: 1997
Main classification: B29C45
IPC codes: B29D7, H01R24, H01R43, H01R13, B29C45