US2277818A - Slider for slide fasteners - Google Patents

Description

March 31, 1942. A. E.. CARLILE V 2,277,818

SLIDER FOR SLIDE FASTENERS Filed Aug. 23, ,1940

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Patented "Mar. 31, 1942 mo 'STATESPAT'ENT oF lcE SLIDE-R FOR SLEDE FASTENERS .Alfred E. Cariile, Meadville, re. assignor to Talon, Inc., a corporation of Pennsylvania Application August 23, 1940, Serial No. 353,913

iillaims. This invention relates to slide fasteners and,

in particular, to the provision of a new and improved slide fastener slider of the type illustrated and described in my copending application Serial No. 320,618, filed February 24, 1940 which maof the slider, a somewhat yieldable lockingtongue' member which is integral with the slider pull tab.

Normally this tongue member rides or skids upon the flat side surfaces of the interlocking fastener members which it bridges when the slider is unlocked and it is necessary to force the locking tongu upwardly of the fastener toward more widely spaced or divergent fastener members, in the crotch of the fastener, in order that it may move inwardlyof the plane of the aforesaid flat side surfacesof the fastener members into wedging engagement with the inclined surfaces of the fastenermember head portions. This operation of the tongue member requires that it be yielding or resilient. I

According to this invention, in order to protect this yieldable locking tongue member from damage and bending when pressure is applied to it in the extreme unlocked position of the pull tab, the pull tab is provided with supporting trunnions of limited section and strength which yield, or are partly sheared, upon application of damaging force to the pull tab, thus permitting sufilcient inward movement of the 'pull tab for protection of the upraised locking tongue bythe'pull tab supporting lugs at opposite sides of the pull tab, which lugs cooperate with the trunnions to atback the pull tabs to the slider body.

This yielding, or shearlng of the pull tab supporting trunnions is achieved by reduction of the fiction of the trunnion end portions inorder that they may become partially sheared upon appliend portions) before they are partially sheared, retain the slider pull tab against objectionable movement inwardly of the slider channel, whereby to prevent inward displacement of the pull tab and consequent difiiculty in assembling the slider to the stringers of a slide fastener. The

I lugs, however, are engaged by portions of the pull tab trunnions which are disposed inwardly of these frangible trunnion end portions, which portions are unaffected by the above-described shearing of the frangible trunnion end portions. Thus displacement of the pull tab outwardly of the slider channel is prevented irrespective of shearing of the frangible trunnion end portions, while entry of the pull tab into the slider channel is blocked by the interlocking fastener members in the slider channel, after the slider is assembled to the stringers of the slide fastener.

- In addition to th above-described function of the frangible end portions of the pull tab supporting trunnions, these trunnion end portions facilitate assembly of the pull tab to the'supporting lugs of the slider body according to the new and improved method of slide fastener slider pull tab assemblies, comprising a part of this invention, which is herein described and illustrated.

otally between them and the slider, body proper; permanently to secure the pull tab in its operative relationship on the slider.

In the drawing: Fig. 1 is a fragmentary view, in perspective, of a conventional slide fastenerembodying a slider constructed according to this invention, apart of the pull tab being broken away in the interest of cleamess of disclosure;

1 Fig:2 is a transverse section-taken substan rtially on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary enlarged section lar to Fig. 2, butshowing the slider assembled cation of dangerous pressure to the locking to the stringers of a slide fastener and illustrat tongue, to permit the pull tab to move inwardly of the slider to place the uppermost part of the locking tongue between and below the upper surfaces of the lugs which then take-the'total applied pressure. p v i,

These trunnion end portions of reduced section (which may be termed frangible trunnion their lower ends by a conventional bottom stop Y H with a slider l2 constructed according to this invention, slidable on the rows of spaced cooperating interlocking fastener members of the stringers l0. Each stringer l comprises a tape l4 with a reinforced edge I 5, upon which reinforced edge I5 is a row of predeterminedly spaced interlocking fastener members l6, secured thereto in conventional manner. The slider I2 is provided with a pull tab member generally designated ll which is pivotally secured thereto and inafter most clearly appear.

by means of which it is moved longitudinally of of the wedge or neck member to form a substantlally Y-shaped upwardly diverging guide channel for the interlocking fastener members [6. The adjacent side flanges 2| are slightly spaced to form slots 22 through which the tapes l4 extend in opposite directions.

While the front and rear wing members l8 and The wing I9 are of like shape and size, the front wingmember I8 is provided with an aperture 24, the side portions of which are formed by the space provided in the front wing member by the striking up of the pull tab supporting lugs 25. These lugs 25 are of substantially U-shaped longitudinal section in the finished, assembled, slider. The intermediate portion of the aperture 24, between the lugs 25, extends downwardly of the front wing member l8, slightly beyond the lower end of the lugs 25, as shown at Fig. 5. Thus, the lugs 25 overlie the side portions of the aperture 24 and are disposed inwardly of the sides of this aperture. In other words, the lugs 25 are, necessarily, more closely spaced than are the sides of the aperture 24.

While it was formerly general practice to form the pull tab supporting lugs in their final position, or substantially perpendicular with respect to the front wing member l8 before assembly of the pull tab member to the slider, or in the position shown in Figs. 2, 3 and 7, according to the principles of this invention, they are formed in the position shown in Fig. 6 prior to assembly of the pull tab thereto and thereafter, as is hereinafter more clearly explained, brought to the positon of Fig. 7 from that position shown in ig.

The pull tab member I! is preferably formed from strip material and comprises a'handle portion 26 of plate-like form having therein an aperture 21 adapting it for the attachment of thongs, ribbons, or the like. Extending downwardly from the lower or inner end of the platelike handle portion 26 is a reduced neck portion 28 having extending from opposite sides thereof trunnions or pivot pins 29 having reduced end portions or extremities 30.

The combined width of the trunnions 29 and the intermediate neck portion 28 is slightly greater than the width of the aperture 24. This difference in width is, however, so slight that only the reduced end portions 30 of the trunnions 29 rest upon the side edges of the aperture 24 in the front wing member l8 to prevent the pull member ll from becoming accidentally displaced inwardly of the slider and from entering the slider channel upon assembly of the slider, as shown in Figs. 1, 2, 5 and 7. '2 hese reduced end portions may be termed frangible trunnion end portions because of their function, as will here- Following assembly of the pull tab member to the slider body, the initial function of these frangible trunnion end portions is thus to prevent accidental displacement of the pull tab member I I, especially before the slider is assembled to the stringers of a slide fastener. As will clearly appear from Figs. 2, 3 and 5, the main portions of the trunnions 29 underlie the lugs 25, whereby retention of the pull tab member I I against displacement outwardly of the slider body is effected totally independently of these frangible trunnion end portions.

As shown in Figs. 1 and 4, a bent-up tongue member 3| of buttonhook like section extends downwardly or inwardly from the neck portion 28 of the pull tab member l1 and this locking tongue member 3| is of less width than the distance between the lugs 25, as shown in Figs. 2, 3, 5 and 7. Because of this relationship, the looking tongue member 3| may move freely between the lugs 25 and through the central portion of the aperture 24 into and out of the fastener member guide channel of the slider l2. The initial shape of the locking tongue member 3! is such that it projects above the lugs 25 when the pull tab member is swung downwardly against the slider body in the fully unlocked position, as

shown in Figs. 1 and 2. This projection of the locking tongue member 3| above the lugs 25 subjects it to initial contact with flatirons and other pressing devices indicated at 32 in Figs. 3 and 4, when such devices are used to press a garment embodying the fastener, of which the slider l2 "nd its pull tab member I I are a part.

Where, as is described in my copending application Serial No. 320,618, the trunnions of the pull tab member are unyielding, the application of pressing force initially'to the locking tongue member 3| will cause the locking tongue member 3| to be bent inwardlyof the slider and toward the handle portion 26 of the pull tab member H to such degree as substantially to impair the effectiveness of its operation as locking means for the slider. As is explained in the above-identified application Serial No. 320,618, it is necessary that this locking tongue member 3| be resilient or springy in order to accomplish its intended function.

By reducing the section of the trunnion end portions 30, the bending of the locking tongue member 3| under the influence of such pressing force is reduced to a minimum because, as is clearly shown in Figs. 3 and 4, the application of pressure downwardly upon the pull tab member fl and its locking tongue member 3| will cause the relatively sharp side edges of the aperture 24 to bite into, cut into, or shear the trunnion end portions 30 of reduced section until the downward force exerted by the pressing device 32 is taken substantially completely by the upproper contour and resiliency whereby it may operate with utmost efliciency in the manner 1 which is intended as is clearly described in the above-identified application Serial No. 320,618.

As will clearly appear fromFig. 5, the width of the plate-like handle portion 26 of the pull tab member is the ultimate width of strip stock necessary for cutting out or stamping out the pull tab member it prior to bending up the locking tongue member 3! to its final shape. In prior pull tab constructions, as illustrated in my application Serial No. 320,618, it was necessary that the pull tab stock be substantially. wider to make it possible to cut out or stamp out the pull tab members with out-spread legsprojecting sidewise, in either direction, for a substantial distance. These legs were thereafter clamped or clenched inwardly until'trunnion projections at their ends extended inwardly under the upsta'nding pull tab retaining lugs on the slider body. Thus, the illustrated pull tab construction, in addition to incorporating in the slider the abovedescribed safety feature, also substantially reduces the cost of production by reducing the width of the strip stock necessary for production while reducing scrap loss.

In addition to the above advantages, this pull tab construction lends itself to the new and improved method of pull tab assembly illustrated in Figs. 6 and 7, wherein the lugs 25 are initially formed at an outward inclination to their final description is merely illustrative and in nowise limiting and that I desire to comprehend within my invention such modifications as are included within the scope of the appended claims. Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is: v 1 j 1. In a slider for slide fasteners, a slider body comprising a pair of connected wing members with a fastener member guide channel therebetween, one of said wings having therein an aperture communicating with said channel, a pair of pull tab retaining lugs overlying said aperr ture at opposite sides, and a pull tab member hinged to said slider body and comprising a plate-like member having a pair of oppositely directed trunnions extending transversely outwardly from its inner end and disposed beneath tab and accommodating movement of the inner said lugs, said trunnions having end portions of reduced section extending beyond the side edges of said aperture and capable of yielding upon application of destructive pressure to said pull end of said pull tab inwardly into said aperture for protecting said pull tab member against destructive deformation.

2. Ina slider for slide fasteners, a slider body comprising a pair of connected wing members with a fastener member guide channel therebetween, one of said wings having therein a locking member accommodating aperture communicating with said channel, a pair of pull tab retaininglugs overlying said aperture at opposite sides, and a locking pull tab member hinged to said slider body and comprising a plate-likemember having,

a locking member at one end projectible through 7 said aperture and a pair of oppositely directed position, the planes thereof being inclined subposition, wherein they are in substantial paral-' lelism.

From the above description, it will clearly appear that I have provided a new and improved manually operated lock slider for slide fasteners of the type described and illustrated in my application Serial No. 320,618, which new and im proved slider construction embodies as an important part thereof a pull tab construction achieving economy of material, with extremely highresistance to damage by pressing because of the safety feature embodied by the frangibility of the trunnion end portions, and that I have also provided a new and improved method of assembling pull tab members to slide fasteners which makes possible the complete preforming of the .pull tab constructions of the type described and illustrated whereby'the strength thereof may be substantially increased over prior locking pull tab members of the same general type without, in any way, increasing, but on the other hand,

decreasing difficulty of the pull tab attaching operation. It is, of course, to be understood that the above trunnions extending outwardly transversely therefrom and disposed beneath said lugs, said trunnions having end portions of reduced section extending beyond the side edges of said aperture and capable of yielding upon application of destructive pressure to said locking member and accommodating inward movement of the ber at its inner end projectible through said aperture into locking engagement with fastener members in said channel and a pair of oppositely directed trunnions extending transversely outwardly therefrom adjacent said locking projection and disposed beneath said lugs, said trunnions overlying said aperture and extending beyond the side edges thereof and the section of the trunnion end portions extending beyond the side edges of said aperture being reduced and capable of being sheared, at least partially, upon application of destructive pressure to said looking member and said pull tab for protecting said locking member against destructive deformation.

4. As a new article of manufacture for use as a pull tab on a slide fastener slider having a pair of transversely spaced pull tab retaining lugs and an aperture extending between and beneath said 5. As a new article of manufacture for use as 10 a locking pull tab on a slide fastener slider having a pair of transversely spaced pull tab retaining lugs and a locking member accommodating aperture extending between and beneath said lugs, a member having a handle portion defining the greatest width of said member, an end portion of reduced width approximately equalling the spacing between said lugs, a pair of oppositely outwardly directed trunnions extending Irom said last-named portion, the combined width of said trumn'ons being less than the width of said handle portion and greater than the width or said aperture, and a locking member on said end portion of less width than said aperture and projectible therein, the end portions of said trunnions having reduced section in order to be 7 sheared by the aperture side edges upon application to said pull tab of pressure directed toward said slider for preventing application of destructive pressure to said locking member.

ALFRED E. CARLILE.

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