US2575501A

US2575501A - Quick disassembly slide fastener

Info

Publication number: US2575501A
Application number: US73097A
Authority: US
Inventors: Ulrich Frederick
Original assignee: Conmar Products Corp
Current assignee: Conmar Products Corp
Priority date: 1949-01-27
Filing date: 1949-01-27
Publication date: 1951-11-20
Anticipated expiration: 1968-11-20

Description

NOV. 20, 1951 F, ULQ H 2,575,501

QUICK DISASSEMBLY SLIDE FASTENER Filed Jan. 27, 1949 2 SHEETS-SHEET l INVENTOR.

Fszzozmcx LJLRCH Nov. 20, 1951 F. ULRICH 2,575,501

QUICK DISASSEMBLY SLIDE FASTENER Filed Jan. 27, 1949 2 SHEETS-SHEET 2 INVENTOR. FREDERICK ULRICH BY v Patented Nov. 20, 1951 QUICK DISASSEMBLY SLIDE FASTENER Frederick Ulrich, Jersey City, N. J., assignor to Conmar Products Corporation, Newark, N. J a corporation of New Jersey Application January 27, 1949, Serial No. 73,097

'7 Claims.

The present invention relates to improvements in slide fasteners, and more particularly to slide fasteners of the quick disassembly type.

In quick disassembly slide fasteners a releasing end stop or so-called slip stop is provided for stopping the slider when drawn with a normal closing force. However, a strong pull draws the slider past this temporary or releasing end stop whereupon the stringers are free to be separated by a quick stripping action without moving the slider back to the bottom stop. To accomplish this quick stripping action the slider must be released by one stringer, usually termed the slider-releasing stringer, and maintained on the other stringer, usually termed the sliderretaining stringer, so that the slider, after quick stripping, may be returned to the bottom stop for reassembly of the two stringers.

Prior to my invention it was necessary to remove the cords beyond the uppermost fastener element on the slider-releasing stringer. The stringer would not release the slider because the sliders flanges or rails would engage the cords upon the tapeedge and prevent the stringer from passing out from between the wings of the slider. This required the use of beaded tape formed by cord sewing, because a tape having its beaded edge formed by weaving or folding could not have its tape edge thickness reduced without mutilating the tape beyond use. Sections of sewn cords had to be removed by a cutting operation with the result that the cut cord edges would quickly fray and give the fastener an unsightly appearance. Attempts have been made to protect the cut cord edges against fraying by some auxiliary means, one such means being bar-tacks. However, besides adding to the cost of the product, these attempts have not been very successful. To initially cut the cords is one extra operation, and to add the auxiliary means is another, thus addtheir relation one to another as is hereinafter more particularly described in the following specs ification. The specification is accompanied by drawings, in which:

Fig. 1 is a plan view of a quick disassembly type of slide fastener embodying some of the prin-,-

ciples of the present invention;

ing to the cost of manufacturing the finished fastener. Other structures have been proposed, requiring complex special slider and the addition of mechanical elements to the tape, but these have not proved commercially successful.

By means of my invention it now is practical to fabricate a quick disassembly fastener which eliminates the necessity for cutting off the cords with its attendant disadvantages of an inferior product which costs more to produce, yet which employs a simple slider having a tape slot of uniform width, and a tape extension which is devoid of mechanical additions. Furthermore, the invention permits the use of tapes having beaded edges formed by weaving or folding, which hitherto could not be used for quick disassembly fasteners.

To accomplish the foregoing general objects, and other more specific objects which will hereinafter appear, my invention resides in the novel quick disassembly slide fastener elements and Fig. 2 shows the upper end of the slide fastener with the slider moved beyond the releasing end stop and prior to stripping the stringers of the fastener apart, the slider pull and lug being omitted for the purpose of clarity in illustration;

Fig. 3 is a view similar to Fig. 2 showing the fastener as the stringers are being stripped apart;

Fig. 4 is a view similar to Figs. 2 and 3 illustrating the fastener after the stringers have been disengaged, with the slider released by one stringer and retained on the other;

Fig. 5 is a perspective view of one form of slider which permits the stringers of a quick disassembly fastener to be stripped apart, notwithstanding the presence of a beaded tape edge above the uppermost fastener element on the slider-releasing stringer;

Fig. 6 is a section taken approximately in the plane of line 6-6 of Fig. 2;

Fig. '7 is a section taken approximately in the plane of line 1-1 of Fig. 3;

Fig. 8 is a view similar to Fig. 1 wherein the releasing end stop is secured to the slider-releasing stringer instead of the slider-retaining stringer;

Fig. 9 is a section similar to Fig. 6 illustrating a modified form of slider for use with the fastener shown in Fig. 8;

Fig. 10 is a section similar to Fig. 7 illustrating the manner in which the slider shown in Fig. 9 releases the beaded tape edge in the stripping op eration;

Fig. 11 is a fragmentary, plan view similar to Fig. 8 illustrating a quick disassembly slidefastener having another form of releasing end stop;

Fig. 12 is a view similar to Figs. 6 and 9 illustrating another form of slider which may be used in the present invention; and

Fig. 13 is a view similar to Figs. 6, 9 and 12 illustrating still another form of a slider which may be used in the present invention.

Referring to the drawings, particularly Figs. 1 through 7, the slide fastener comprises a sliderretaining stringer l2 and a slider-releasing stringer l4, each provided with spaced, interlockable fastener elements l6, and a slider l8 movable therealong by means of a suitable handle or so-called pull 20. The stringers l2 and I4 comprise tapes 22 having beaded edges 24 about which the fastener elements 16 are clamped or secured. As illustrated in Figs. 6 and 7, the beaded edges 24 are formed by sewing cords 26 upon opposite edges of the tape 22.

A releasing end stop or so-called slip stop 23 upwardly from the endmost fastener element on P the other stringer l4, designated. l6, by .an

amount slightly greater than the length of the slider l8. To positively insure retention of the slider H! on the stringer (2, even when using a symmetrical slider described later, the fastener lements which will engage iastener element is and. the positi Le stop ,30, as indicated by elements .Ihe slideiastener illustrated is of the fully separable type having the usual separable bottom stop construction,.the one shown in Fig. 1 being disclosed in .8. Letters Patent 2,216,792 '0 Frederick Ulrich, granted October .8, 1940. Elie-terms ftop and bottom are here used as is .customary in the .art for the fastener may, ofponrse, bensed, in any position, The .eparable bottom stop includes a stud 3:2 clamped onto the beaded edge 24 of the stringer [-2. A slip as clamped onto the lower portion of the stud 32 provides .a socket ior removably receiving a pin .35 which is clamped onto the beaded edge of the stringer l4. As is well known in the art, when the slider .18 in its lowermost position on the slide fastener and in contact with the top of the clip 3.4, the pin 36 may be threaded through the sliderv 1.8 and into or out of the socket.

. In general, the separable bottom stop may be of any desired construction. Instead of the pin and c p-type of s parable end stop assem bly, a fully separabIeend'stop assembly ma be usedof the typedisolosed in the pending application of Albert Bashover, Serial Number 59330, nledNovember 10,1948, nowiPatent No. 2,553,230, Paten ed June 26, 1-95 :h ving the same ass gnee as theme ent pplic tio :If th s ype of sea arable end stop-assembly is selected, fastener elementsof the double-acting type are used in lieu of he one-way type of fastener element [6 illustrated.

'The'releas ng end stop 'or slip t p 8 is of the type disclosed the pending application of mm .J; M ehler, fierialNi-imber 2.9.8 7, fil d May 28, 1948, having the same assignee as the present apol-ication. F r the pu pose of this invention, it is sufiicient to state hat this type of releasin end stop co-aets with a fastener element on the QPPQ iDg strin er Within the slider to cause the slider to be halted when a normal pull is exerted. However, when subjected-t a stronger pull, the slider moves past the stop 25 and slides upwardly until s opped y t e p stop 30.

In accordance with my invention, and unlike previous quick disassembly slide fastener constructions, the cords .216 on the slider-releasing stringer I4 are not removed or cut on above the uppermost fastener element [5. On the one hand there is no need to remove the cords, and on the other hand there is no need to add mechanical .or metal parts to the tape. This highly desirable aspect of the fastener is made possible by the-construction of the slider. The slider is for-med with a tape slot on the side of the slider releasing strin er, WhiQh slot is suiiiciently large to allow the headed or uncut cord edge o the tape to pass therethrough. Though the tape slot is enlarged, the slider is formed so that it nevertheless will prevent interlocked fastener elements from unmeshing when the fastener is subjected to cross-pull below the slider. While the slider is not a standard slider, it is nevertheless a very simple slider which can be made as readily and as cheaply as a standard slider, for the tape slot is asimple slot which is straight and uniform in width throughout its length, just like that of an ordinary slider.

A shownin Figs. 5, 6 and 7, the slider I8 comprises a top wing 30 and a bottom wing connested together by a neck or post 42. The top wing 38 is provided with the usual pair of inturned rails .or fiangesM, 45. The top wing also has the usual lug 48 to which the push ill-is secured. However, the bottomwing 40, instead of being provided with the usual pair of inturned rails or flanges, is formed with but one rail on .the left or the slider-retaining stringer side. By .forming the slider IS without a rail .or flange on the slider-releasing stringer side, the resulting tape slot, designated T, provides an opening ofsufllcient. size to permit the beaded edge of the tape above the uppermost fastener element 15 on the slider-releasingstringer to come out without diiiiculty. This beaded ed e portion of the tape is designated 25, The Slider Win s 38, 9. the neck 4.2 and the rails .44, iii/alone provide the requisite Y-shaped channel which serves .to com the fastener elements 1.6 into .or out of engagement with each other. Though the tape slot has been opened, the dimensions .of the fastener ele- .ments 16 with resp ct to the slider channel are such that the meshed fastener elements will not .unmesh when cross-pull isapplied tothe fastener below the slider. Figs. 3 and 7 illustrate how. the beaded edge portion 24', devoid of fastener ole ments thereon, passes laterally through the tape slot 1 when .a transverse pull isexerted upon the stringers 12 and M, the slider 18 being beyond the releasing end stop 28. Fig. 4shows how the slider-releasing stringer I1 is completely disengaged from the slider I8 and retained by the permanent stop 30 upon the stringer [2.

While the tape slot T is made largerthan in the ordinary slider, it is preferred that it .be made somewhat smaller than the thickness of the beaded tape edge 24. For example, it is considered good manufacturing practice to fabricate an ordinary slider, one having four rails, for a seeoalled #5 separable'fastener with the following dimensions:

inches Rail height, 0.033 to 0.034 Body .opening 0.102 to 0.1065 Tape slot 0.035 to 0.040

Rail'height, body opening and tape slot aredesignated a, 'b and 0, respectively, in Figs. 5, 6

and 7. The beaded edge thickness formed by sewing cards on opposite sides of the tape measures from 0.087 to 0.090 inch. The beaded edge simply will not come out of a tape slot, 0 of from 0.035 to 0.040 inch. It, therefore, was necessary 1 heretofore to cut off the cords to permit stripping the stringers apart. However, by forming the slider without one rail, the tape slot is opened by an additional 0.033 to 0.034 inch, thereby resulting in a tape slot T having an opening of from 0.068 to 0.073 inch. Instead of a difference between beaded edge thickness and tape slot on the order of 0.048 to 0.053 inch with a slider having the usual pair of tape slots of width 0, the difference with the present slot T is on the order of only 0.015 to 0.020 inch. While the tape slot T is not quite as large as the thickness of the beaded tape edge, it has been found that the beaded edge nevertheless will pass therethrough. Presumably the textile materials possess sufficient resiliency or compressibility to enable the beaded edge to come through the enlarged slot without undue resistance. Moreover, in applying a transverse pull to the stringers to strip them apart, as shown in Figs. 3 and 7, the beaded edge 24' rarely, if ever, moves toward the slot in a perfectly upright position; that is to say, there usually is some angular displacement imparted to the beaded edge, as shown for example in Fig. '7, which lessens the effective height of the beaded edge presented to the slot. Furthermore, if in stripping the stringers apart, the cord adjacent the rail 44 strikes said rail, the beaded edge will pivot about this point of contact and tilt, as also is shown in Fig. 7, thereby permitting the tape easily to be pulled from within the slider.

It shall be understood that the numerical dimensions for a #5 fastener are given by way of specific example only. Reasonable variations may be made depending upon inherent differences in slider structure and manufacture without departing from the spirit of the disclosed invention. Moreover, the dimensions are of interest from the standpoint of the relation of one to another rather than to their actual values, especially the relation of the tape bead to the widened slot T. Thus, it would be obvious how to dimension sliders for different fastener sizes.

By enlarging the tape slot without shortening the height of the adjoining rail 44, said rail 44 in combination with the rail 46 alone affords a Y-shaped channel which prevents interlocked fastener elements 16 from unmeshing when crosspull is applied to the stringers below the slider. I have found that even the rail 50 is unnecessary insofar as it supplies resistance to cross-pull disengaging forces applied to meshed fastener elements. The rail 50 is provided primarily because the particular releasing end stop 28 illustrated requires the presence of rails behind it when 00- acting with an opposing fastener element. If instead, a releasing end stop for example of the type disclosed in the Griffin patent, 2,422,093, issued June 10, 1947, were to be used, the rail 50 also may be omitted. This type of releasing end stop comprises a resilient member which exerts pressure upon the opposite inner flat surfaces of the wings, the slider rails playing no part in the halting action. With rail 59 omitted the slider would be symmetrical.

Fig. 8 shows a quick disassembly slide fastener in which the releasing end stop 28 shown in Fig. 1 is attached to the slider-releasing stringer [4 instead of the slider-retaining stringer 12. The change in location of the releasing end stop, now designated 28', requires slight modification of the slider l8. The modified slider is designated '52, and since all other components of the fastener are the same, the same reference numerals are used for these components.

As hereinbefore stated, the illustrated type of releasing end stop requires the presence of two slider rails or portions thereof on the side of the fastener upon which the releasing end stop is located. As shown in Fig. 9, the slider 52 comprises a top wing 54 and a bottom wing 56 connected by the usual neck or post. The top wing 54 possesses the usual pair of

inturned rails

58, 60 and the bottom wing 56 is provided with the usual rail 62. However, instead of the ordinary equal height fourth rail, indicated by the dotted 8 outline 1:, a low rail 64 is formed on the releaslug-stringer side of the slider. The height d of the rail 64 is approximately 0.010 inch. This very small rail height is sufficient to permit the releasing end stop 28' to function properly, and yet provide a wide tape slot between the

rails

58 and 64, designated T, which will allow the beaded edge 24' topass laterally therethrough. Fig. 10

illustrates the manner in which the beaded edge 24' passes out through the tape slot T during the stripping action. The passage of the beaded tape edge through the slot takes place in essentially the same way as described with respect to the fastener shown in Figs. 1 to '7. The beaded edge is subjected to slightly greater wear, however, because of the presence of the partial rail 64, and for that reason a fastener which permits the use of the slider I8 is preferred.

Here again the slider may, if desired, be made symmetrical by reducing the height of the rail 62 to equal that of the rail 64. Such symmetry would not affect the functioning of the present invention, which depends directly on the slot width at the stringer releasing side of the slider. The other side is of no concern except insofar as it may affect the operation of some kinds of slip stop.

Fig. 11 illustrates a fastener identical with the fastener shown in Fig. l but utilizing another type of releasing end stop, shown at 66. The releasing end stop 66 is of the type disclosed in the pending patent application of Claude Disinger, Serial Number 36,726, filed July 2, 1948, now patent No. 2,558,239, patented June 26, 1951, having the same assignee as the present application. This releasin end stop also co-acts with a fastener element on the opposing stringer. The construction and principle of operation of the releasing end stop 66, however, is such that it does not require the presence of slider rail surfaces, or even portions thereof, on its side of the slider. The engagement of an opposing fastener element with the releasing end stop 66 causes the beaded edge upon which the releasing end stop is mounted to be flexed to provide resilient resistance to the passage of the slider, and hence it may be attached to either the stringer I4 or the stringer l2, as shown. This permits the use of the slider 18 with its larger tape slot regardless of the'location of the stop 66. The right hand rail may be omitted, as in Fig. 6, or both right and left hand rails omitted for symmetry, and the slip stop 66 may be placed on either side in either case.

Fig. 12 illustrates a modification of the slider l8 shown in Figs. 1 to '7. Instead of the tape slot being enlarged by omitting one rail on the bottom wing, this time the top wing is formed with only one rail, the bottom wing having the usual pair of rails. Here too the slider may be made sym metrical by omittin both top rails. Y

Fig. 13 illustrates a variation of the slider 52, shown in Figs. 9 and 10. Instead of the tape slot T being enlarged by forming a low rail 64 on the bottom wing, the low rail 14 is formed on the top wing, with rails of usual height formed on the lower wing.

For the reasons heretofore stated which permit the omission of the rail 50 in slider 18, the top wing of the slider shown in Fig. 13 may be provided with a pair of low rails instead of one low rail as shown. Such a modification afl'ords symmetry of the slider wings. In all cases one slider wing preferably has rails of full height. In other words, the tape slot is widened by changing only one of the two rails at that slot, the other rail being left at'full height to best hold the fastener elements.

The sliders depicted in the drawings are of the non-locking type. However, it is within the scope of the invention to use a locking type of slider, such as those commonly referred to in the art as automatic lock, pin lock, cam lock, and wing lock sliders.

While the invention has been specifically described with relation to beaded edge tapes formed by sewing cords on opposite sides thereof, it is within the scope of the invention to utilize tapes having their beaded edges formed by weaving a cord or cords as an integral part or parts of the tape. Random examples of such tapes are described in the Jones Patents 2,333,314 and 2,373,835, issued November 2, 1943 and April 17, 1945, respectively. The invention also permits the use of tapes having their beaded edges formed by folding, a random example of this type of tape being described in the patent to Kiessling,

1,900,564, issued March 7, 1933. Prior to the present invention, such tapes could not be used for a quick disassembly fastener because it was impossible to reduce the thickness of the beaded edge without ruining the tape.

The slider constructions described afi'ord an additional advantage in a fully separable fastener of the pin and clip type such as shown in Fig. 1, because the enlarged tape slot facilitates threading the pin through the slider and into and out of the socket provided by the clip.

While aquick disassembly fastener of the fully separable type has been described, the invention is utilizable with a quick disassembly fastener having a bottom stop which is not fully separable, such as disclosed in the co-pending application of David Rabinow and Otto J. Moehler, Serial Number 613,890, filed August 31, 1945, having the same assignee as the present application.

It is believed that the construction and operation of my improved quick-disassembly fastener, as well as the advantages thereof, will be apparent from the foregoing detailed description. The main general advantages are obvious, for the cost of manufacture is substantially reduced, yet at the same time a superior product is obtained. Other advantages are that the slider, while not a standard slider, is one which is as simple, and in a sense even simpler, than a standard slider, and may be made at equally low cost, and without changing the conventional methods of fabrication. Another is that the slider releasing stringer is made at minimum cost, for the only requirement is the omission of some of the fastener elements. There is no need to remove the cords, and at the same time there is no need to add any metal or mechanical parts to the tape. The fastener, and the garments in which the fastener is used, are improved in appearance by the retention of the cords, andby the omission of conspicuous or unsightly metal parts. Another advantage is the freedom of choice of tape, for the present invention may be employed with a woven or folded tape, as well as with a tape having sewn cords. Still another advantage is that it is easier to thread the pin of a fully separable bottom stop thru the slider.

It will be apparent that while I have shown and described my invention in several preferred forms, changes may be made in the constructions disclosed, without departing from the spirit of the invention as sought to be defined in the following claims. In the claims the expression rail of reduced height is intended to include the ex treme case of reduction all the way down to zero height.

I claim:

1. A quick disassembly slide fastener comprising a slider-retaining stringer, a slider-releasing stringer, a releasing end stop secured to the fastener near the top thereof, and a slider having a Y-shaped channel, said stringers being formed of beaded edge tape having spaced, interlockable fastener elements secured thereto, said sliderreleasing stringer having the beaded edge extending beyond its uppermost fastener element for the length of the tape, said slider being formed with a tape slot of uniform width climensioned to permit the slider, when beyond the releasing end stop and said uppermost fastener element, to be released readily by the slider-releasing stringer notwithstanding the presence of the beaded edge, said slider comprising spaced top and bottom wings joined by a neck at one end thereof, only one of said wings being provided with a pair of inturned rail-s, the other of said wings having a rail on the slider-retaining stringer side of the fastener only, whereby the tape slot on the slider-releasing stringer side is wider than the tape slot on the slider-retaining stringer side and is wide enough to pass the beaded edge of the tape.

2. A quick disassembly fully separable slide fastener comprising a pair of stringers each formed of beaded edge tape having spaced, interlockable fastener elements secured thereto, a slider having a Y-shaped channel, a fully separable bottom stop assembly, a positive top stop secured to one of the stringers and spaced above the endinost fastener element on the second stringer by an amount greaterthan the length of the slider, said second stringer having the beaded edge extending beyond its endmost fastener element for the length of the tape, said beaded edge beyond said endmost fastener element being the regular simple flexible beaded edge of the tape, and a releasing end stop secured to one of said stringers intermediate at least a pair of adjacent fastener elements, said slider being formed with a tape slot of uniform Width dimensioned to permit the slider, when beyond the releasing end stop and the endrnost fastener element on the second stringer, to be released readily by the second stringer notwithstanding the presence of the beaded edge, said tape slot facilitating assembly of the stringers at the bottom stop, said slider comprising spaced top and bottom wings joined by a neck at one end thereof, only one of said wings being provided with a pair of inturned rails, the other of said wings having a rail on the slider-retaining stringer side of the fastener only, whereby the tape slot on the slider-releasing stringer side is wider than the tape slot on the slider-retaining stringer side and is wide enough to pass the beaded edge of the tape. 7

3. A quick disassembly slide fastener comprising a slider-retaining stringer, a slider-releasing stringer, a releasing end stop secured to the fastener near the top thereof, and a slider having a Y-shaped channel, said stringers being formed of beaded edge tape having spaced, interlockable fastener elements secured thereto, said sliderreleasing stringer having the beaded edge ex tending beyond its uppermost fastener element for the length of the tape, said slider being formed with a narrow tape slot on the slider retaining side, said slot being of uniform width and being too narrow to escape from the beaded edge of the tape, and said slider being formed with a wider tape slot of uniform width on the slider releasing side, said Wider tape slot being dimensioned to permit the slider, when beyond the releasing end stop and said uppermost fastener element, to be released readily by the sliderreleasing stringer notwithstanding the presence of the beaded edge.

4. A quick disassembly slide fastener comprising a slider-retaining stringer, a slider-releasing stringer, a releasing end stop secured to the fastener near the top thereof, and a slider having a Y-shaped channel, said stringers being formed of beaded edge tape having spaced, interlockable fastener elements secured thereto, said sliderreleasing stringer having the beaded edge extending beyond its uppermost fastener element for the length of the tape, said slider being formed with a tape slot of uniform width dimensioned to permit the slider, when beyond the ,releasing end stop and said uppermost fastener element, to be released readily by the slider-releasing stringer notwithstanding the presence of the beaded edge, 'said slider comprising spaced top and bottom wings joined by a neck at one end thereof, only one of said wings being provided with a pair of inturned rails of standard height, the other of said wings being provided on the slider-retaining stringer side with an inturned rail of standard height and on the slider-releasing stringer side of the fastener with an inturned rail having a height substantially less than the standard height, "whereby the tape slot on the slider-releasing stringer side is wider than the tape slot on the slider-retaining stringer side and is wide enough to pass the beaded edge of the tape.

5. A quick disassembly fully separable slide fastener comprising a pair of stringers each formed of beaded edge tape having spaced, interlockable fastener elements secured thereto, a slider having a Y-shaped channel, a fully separable bottom stop assembly, a positive top stop secured to one of the stringers and spaced above the endmost fastener element on the second stringer by an amount greater than the length of the slider, said second stringer having the beaded edge extending beyond its endmost fastener element for the length of the tape, said beaded edge beyond said endmost fastener being the regular simple flexible beaded edge of the tape, and a releasing end stop secured to one of said stringers intermediate at least a pair of adjacent fastener elements, said slider being formed with a narrow tape slot on the slider retaining side, said slot being of uniform width and being too narrow to escape from the beaded edge of the tape, and said slider being formed with a wide tape slot of uniform width on the slider releasing side, said Wide tape slot being dimensioned to permit the slider, when beyond the releasing end stop and the endmost fastener element on the second stringer, to be released readily by the second stringer notwithstanding the presence of the beaded edge, said wide tape slot facilitating assembly of the stringers at the bottom stop.

6. A quick disassembly fully separable slide fastener comprising a pair of stringers each formed of beaded edge tape having spaced, interlockable fastener elements secured thereto, a slider having a Y-shaped channel, .a fully separable bottom stop assembly, a positive top stop secured to one of the stringers and spaced above the endmost fastener element on the second pair of adjacent fastener elements, said slider being formed with a tape slot of uniform width dimensioned to permit the slider, when beyond the releasing end stop and the endmost fastener element on the second stringer, to be released readily by the second stringer notwithstanding the presence of the beaded edge, said tape slot facilitating assembly of the stringers at the bottom stop, said slider comprising spaced top and bottom wings joined by a neck at one end thereof, only one of said wings being provided with a pair of inturned rails of standard height, the other of said wings being provided on the slider-retaining stringer side with an inturned rail of standard height and on the sliderreleasing stringer side of the fastener with an inturned rail having a height substantially less than the standard height, whereby the tape slot on the slider-releasing stringer side is wider than the tape slot on the slider-retaining stringer side and is wide enough to pass the beaded edge of the tape.

'7. A quick disassembly fully separable slide fastener comprising a pair of stringers each formed of beaded edge tape having spaced, interlockable fastener elements secured thereto, a slider having a Y-shaped channel, a fully separable bottom stop assembly, a positive top stop secured to one of the stringers and spaced above the endmost fastener element on the second stringer by an amount greater than the length of the slider, said second stringer having the beaded edge extending beyond its endmost element for the length of the tape, said beaded edge beyond said endmost element being the regular simple flexible beaded edge of the tape, and a releasing end stop secured to one of said stringers intermediate at least a pair of adjacent fastener elements, said slider comprising spaced top and bottom wings joined by a neck at one end thereof, one only of said wings being provided with a pair of inturned rails, the other of said wings having a rail on the slider-retaining stringer side of the fastener only, the resulting wide tape slot being wider than that on the slider-retaining side and being dimensioned to pass the beaded edge of the tape and thereby to permit the slider when beyond the releasing end stop and the endmost element on the second stringer to be released readily by the second stringer notwithstanding the presence of the beaded edge, and said wide tape slot also facilitating assembly "of the stringers at the FREDERICK ULRICH REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 22,715 Parkin Jan. 22, 1946 2,265,353 Corner Dec. 9, 1941 2,370,059 Marinsky Feb. 20, 1945 2,438,614 Morin Mar. 30, 1948 FOREIGN PATENTS Number Country Date 550,802 Great Britain of 1948