US 3011251 A
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A. J. MONAMARA 3,011,251
METHOD OF MAKING CONCEALED SLIDE FASTENER Filed May 31, 1960 Dec. 5, 1961 INVENTOR. AMBROSE J. MO NAMARA "maw - ATTORNEY it .tates 3,011,251 METHOD OF MAKING CONCEALED V SLIDE FASTENER Ambrose J. McNamara, White Plains, N.Y., assignor to Irving Constant, Esq., New York, N.Y. Filed May 31, 1960, Ser. No. 32,802 5 Claims. (Cl. 29-408) This invention relates to a method of making a concealed slide fastener.
It has become increasingly popular in recent years to provide concealed slide fasteners on cloth members. The provision of a concealed slide fastener is desirable since it simulates a sewn seam in its closed disposition. The fastener elements on the tapes of a concealed slide fastener are appreciably smaller than the fastener elements on a conventional slide fastener tape. Considerable difficulty has been encountered in providing a diamond on the slider which has the requisite tolerances so that the fastener elements on the tapes mesh together at the proper time. Thus, it has been found that a variance in .002 inch in the diamond will render the slide fastener absolutely worthless. In the conventional slide fastener, the problem is only present to a small degree. However, with concealed slide fasteners and the smaller fastener ele- I merits, the problem is magnified.
Heretofore, it has been proposed to make the slider by die casting the same with the diamond integral with the slider back. It has been extremely difficult to maintain the requisite tolerances on the diamond when the slider is made in this fashion. Further, the slider has been made from a relatively soft material with the diamond integral therewith. Thus, the tolerances achieved by die casting the slider are soon lost due to the contact between the faces of the diamond and the heads of the fastener elements.
It is an object of the present invention to provide a method of making a concealed slide fastener wherein the diamond is made from a material harder than the material of the slider back and flanks.
It is another object of the present invention to provide a method of making a concealed slide fastener capable of having the requisite tolerances on the diamond neces-' sary for effecting a meshing of the fastener elements on the slide fastener tapes.
Other objects will appear hereinafter.
For the purpose of illustrating the invention there is shown in the drawings a form which is presently preferred; it being understood, however, that this invention is not limited to the precise arrangements and the instrumentalities shown.
FEGURE 1 is a top plan view of one a slider of the present invention.
FKGURE 2 is a cross sectional view taken along the lines 2-2 in FIGURE 1.
embodiment of 1 ear 20 on themating half 16. The size of the apertures in the cars 18 and 20 are such that a pin 22 extends through the apertures while permitting the halves 14 and 16 to pivot relative to one another. The pin 22 extends into a blind hole 24 in the diamond 30.
The uppermost portions of the halves 14 and 16 are beveled to form a scarf half joint. The halves 14 and 16 are formed in the shape of wings and are provided with respective side arms 26 and 28. The side arms 26 and 28 are contoured so as to be substantial juxtaposed images of each other.
The diamond 30- is carried on the inside face of the slider back 12. The diamond 30 is provided with separating arms 32 and 34. As seen more clearly in FIG- URE l, the separating arms 32 and 34 converge inwardly from the uppermost portion of the diamond 30 to the apex 38. The slider back 12 is divided along a center line 36 which bisects the apex 33 of the diamond 30. The edges of the halves 14 and 16 mate along the center line 36.
The halves 14 and 16 are secured together by a locking clip 40. Each of the halves 14 and 16 are provided with a mating groove which extends around the periphery of the arms 26 and 28. The locking clip 40 is received within the grooves to hold the halves 14 and 16 in their assembled disposition. The locking clip 40 may be pried loose from the mating grooves to separate the halves l4 and '16 when the same is desired.
A pull tab 42, shown in phantom in FIGURE 2, is received in an aperture in a lug 44. The lug 44 is inte gral with the diamond 30. As shown more clearly in FIGURE 2, the diamond 30 is hatched differently from the hatching of the slider back plate 12 so as to indicate that the slider back plate 12 is made from a metal different from the metal of the diamond 30. The diamond 30 is made from a metal which is substantially harder than the metal used for making the slider back plate 12 In this manner, it is possible to obtain finer tolerances on the diamond and at the same time provide a dimond which is made from a material harder than the material of the slider back plate 12.
Referring to FIGURES 3 and 4, there is shown a slider 10' having substantially the same configuration as the slider 10. The elements of slider 10' which are identical with the elements of the slider 10 are primed. The slider back plate 12 is die cast as an integral back plate.
, The diamond 30' is is provided with an integral stud 46 FlGURE 3 is a top plan view of another embodiment of the slider of thepresent invention.
FIGURE 4 is a cross sectional view taken along the lines 4-4 in FIGURE 3.
FIGURE 5 is a cross sectional view of a concealed slide fastener assembled to folded cloth members.
FIGURE 5 is a top plan view of a slide fastener.
Referring to the drawing in detail, wherein like numerals indicate like elements, there is shown in FIGURE 1 a slider is. I
The slider '10 comprises a split back plate 12. The split back plate 12 is comprised of mating halves 14 and 16. The mating halves 14 and 16 are substantial mirror images of each other except in their uppermost portions. Thus, the uppermost portion of the half 14 is provided with an ofiset car 18 which mates with a similar offset g tapes 50 and 52.
depending downwardly from the body of the diamond The outer peripheral surface of the stud 46 is grooved by knurling 48. The diamond 30' is made from a material substantially harder than the slider back plate The diamond 30 is made as a separate element and placed within the die mold for the slider back plate 12..
The slider back plate 12 is cast about the diamond30'. The molten metal for theslide back plate 12 enters the knurling 45 thereby providing a rigid joint which decreases the possibility of the diamond 30 separating from the slider back plate 12'.
The sliders 10and 10 are assernbled onto the fasteners The fastener tapes 50 and 52 are provided with fastener elements 54 along adjacent edges thereof as is conventional in the art. Since the slider 10 comprises halves 14 and 16 which can pivot relative to the diamond 30, the slider 10 may be assembled onto the fastener tapes 50 and 52 after the tapes 50 and 52 have been joined by a bridging means. Also, the slider 10 may be present on the fastener tapes 50 and 52 prior to and during the stitching of the fastener'tapes 50. and 52 terconnects the tape 52 and an inner ply of the cloth Patented Dec. 5, 1961 g 3 member 56. The tape 50' is joined to an inner ply of the cloth member 58 by a line of stitching 62.
The slider may be assembled to the tapes 50 and 52, and the tapes 50 and 52 may be stitched to the inner plies of the cloth members 56 and 58 according to the method set forth in my copending application Serial No. 761,094, filed September 15, 1958, for Method for Assembling Slide Fastener to Cloth Article. The method disclosed in said copending application is incorporated herewith by reference.
This application is a continuation in part of my copending application Serial No. 742,199, filed June 16, 195 8, for Slider, now Patent No. 2,977,656 granted April 4, 1961.
The present invention may be embodied in other specific forms Without departing from the spirit or essential attributes thereof and, accordingly, reference should be made to the appended claims, rather than to the foregoing specification as indicating the scope of the invention.
1. A method of making a slide fastener concealed by a cloth member which comprises making a diamond having separating arms from a relatively hard material, making a slider back plate having flanks from a material which is softer than the material of said diamond, then connecting only said back plate and said diamond so as to form a slider, assembling said slider to a pair of fastener tapes having fastener elements on adjacent edges, and sewing said tapes to a fold ply of a cloth member by a line of stitching adjacent the fastener elements so as to conceal the tapes and slider.
2. A method of making a slide fastener in accordance with claim 1 wherein said step of making the slider back plate and flanks includes the step of die casting mating halves which form the back plate and flanks, providing an aperture in each of said halves, and said step of connecting the back plate to the diamond includes the step of providing a blind hole in said diamond and inserting a pin through said apertures into said blind hole.
3. A method of making a slide fastener in accordance with claim 1 wherein said step of connecting the slider back plate having flanks to said diamond and said step of making a slider back plate and flanks are done simultaneously by placing said diamond in the die mold for said slider back plate and flanks, and die casting said back plate and flanks only about a portion of said diamond which extends in a direction substantially perpendicular to the plane of said separating arms.
4. A method of making a slide fastener in accordance with claim 3 including the step of roughening the surface of the portion of said diamond about which the slider back plate and flanks are cast so as to provide a rigid joint thereby decreasing the possibility of said diamond separating from said back plate.
5. A method of making a slide fastener comprising making a diamond having separating arms from a relatively hard material, making a pair of identical mating halves each having a flank from a material which is softer than the material of said diamond, providing an aperture adjacent one end in each of said halves, positioning said halves side by side in the same plane, then connecting each of said halves to said diamond so that said halves may be pivotable with respect to each other and said diamond, and then locking said halves together.
References fitted in the file of this patent UNITED STATES PATENTS 1,919,455 Wilson July 25, 1933 2,155,795 Markin Apr. 25, 1939 2,320,566 Carlile June 1, 1943 2,458,914 Morin Jan. 11, 1949 2,486,401 Gerstman Nov. 1, 1949 2,526,653 Gerstman Oct. 24, 1950 2,697,227 Prupis Dec. 21, 1954