US1752928A - Process of and blank for use in making sliders for separable fasteners - Google Patents

Description

April 1, 1930. G. E. PRENTICE 1,752,928

PROCESS. OF AND BLANK FOR USE IN MAKING SLIDERS FOR SEPARABLE FASTENERS Filed April 22, 1927 J a a a 5 a 7 Ta 25 .2.9" f a 2 .14. J4" 49: 6 a $60796ZE1727206 50 a l] 662 M.

1 :45 J a it Patented Apr. 1, 1930 UNITED STATES PATENT OFFICE GEORGE E. PRENTICE, OF BERLIN, CONNECTICUT PROCESS OF AND BLANK FOR USE IN MAKING SLIDERS FOR SEPARABLE FASTENERS Application fil ed April 22,

This invention pertains to separable fastoners of that general type of which an earlier example is disclosed in the patent to Judson, No. 504,038, August- 29, 1893, and relates moreparticularly to a novel process of making sliders of the type claimed in my copending application Serial No. 185.874 filed April 22, 1927, and to a blank useful in the practice of said process. 7

The most common form of slider employed in fasteners of this type has spaced front and rear wings united at one end, the opposite faces of the wings having cam-like elements for guiding the opposed series of fasteners as they approach or recede. Certain attempts have been made to form such sliders by a die casting or similar process with the objectof securing a rigid and durable construction, (the British patent to Kuhn-Moos, No. 14,858, January 19, 19l2,apparently disclosing one example of this form of slider) but as this mode of procedure is expensive and difiicult and the resulting slider is often un duly heavy and clumsy looking, sliders formed in this manner have not found favor, at least in this country.

The usual. form of slider is made of sheet metal for the sake of lightness and ease of manufacture, but in order't-o obtain the neccssary stiffness to withstand the strains to which it is subjected it is substantially necessary to provide some type of reinforce to stiffen the slider, particularly at the neck or narrow part which unites the front and rear wings, so as to hold the Wings in parallel relation and to prevent them from spreading or twisting. Heretofore it has been customary to make the reinforce member or yoke from one or more pieces of sheet metal, independent of the slider proper (that is to say the wings with their connecting neck) and then, after bending or otherwise shaping the various parts, to assemble them and connect them by suitable fastening means, for example. rivets or solder. several independent parts, to assemble them, and then to connect them necessitates the en'iploymentof several dies (for blanking, bending, etc.),-the careful assemblage by hand of a plurality of minute parts, and the front and rear wings with their connecting To prepare these 1927. Serial No. 185,875.

riveting or other operation necessary permanently to unite them, and this long series of operations consumes time and an unnecessary amount of material and unduly increases the cost of production. Since the complete fastener including the slider must be manufactured to sell at a low price, it is essential to keep the cost of producing the slider as low as possible consistent with the production of an article of good quality.

In accordance with the present invention I have devised a novel process of making sliders together with a blank useful in the practice of the process by means of which the cost of material and labor employed in producing sliders of this type is reduced to aminimum, while at the same time the resulting slider possesses all of the characteristics which are to be desired in a slider, that is to say, light weight, pleasing appearance, stiffness, durability, and ease of operation. This improved slider consists of but a single piece of sheet metal (not including the handle or pull device) so shaped and bent as to provide the neck, the stiffening .or reinforce member, a pull attaching element, and also such securing means as are necessary to hold the parts permanently in properrelation.

In the accompanying drawings I have illustrated by way of example certain-forms of blank useful in performing my improved process, together with certain of themore important steps in the process as well as the novel slider resulting from the practice of this process. In the drawings Fig. 1 is a fragmentary front elevation showing a fastener of the general type above referred to, provided with a slider construct-- ed in accordance with the present invention;

Fig. 2 is a side elevation from the lefthand side of the slider shown in Fig. 1, removed from the fastener elements;

Fig. 3 is a vertical section substantially on the line 33 of Fig. 2;.

Fig. 4 is a vertical section partly in elevation substantially on the line 44 of Fig. 1

showing the slider removed from the series of fastener elements; lot

I Fig. 5 is a vertical section substantially on the line 55 of Fig. L;

Fig. 6 is a bottom plan view. of the slider, omitting the pull device;

Fig. 7 is a transverse section substantially on the line 77 of Fig. 5;

Fig. 8 is a rear elevation of the complete slider;

Fig. 9 is a plan view of a one-piece blank adapted to form the entire slider body, exclusive of the pull device;

Fig. 10 is a view of the blank shown in Fig. 9 but after the earlier steps of the operatipin of forming-the slider have been complete r Fig. 11 is an edge elevation of the blank showing its appearance after it has been subjected to certain subsequent operations;

Fig. 12 is a side elevation of the blank showing it at a further stage of the process;

Fig. 13 is a side elevation of the blank showing itjust prior to completion of the slider;

Fig". 14 is a fragmentary plan view showing a'inodified construction of the upper end of the blank shown in Fig. 9;

Fig. 15 is a fragmentary view illustrating a modified construction of the lower end of the -bi ank shown in Fig. 9; and

Fig: "16 is a bottom plan yiew showing the slider embodying the modifications shown in Figs. 14 and 15 together with other slight modifications.

In Fig. 1 the numerals 1 and 2 designate a pair of tapes or stringers to whose opposed edges the series of fastener elements 3 and 3 are secured. As here shown, these fastener elements are of the general type disclosed in my copending application Serial No. 709,643, April 28', 1924, the fastener elements of each series constituting the individual turns of spiral coils of wire, the turns of one coil being hooked and adapted to intermesh between the'turns of the opposite coil and positively to interlocktherewith in the manner fully described in my aforesaid copending application.

The form of slider disclosed in Figs. 2 to 13 inclusive is particularly adapted for-use with fastener elements of the above. character, but, if desired, I may employ fastener elements of other types, for example, such as shown in the co ending application of Prentice and Legat, erial No. 91,932, March 13. 1926, in which the fastener elements of both series are alike. For use with fastener elements of this latter character I prefer to employ a slider of the modified construction shown in Fig. 16 as will be described more fully hereafter. However, it is to be understood that so far as the broad principles of the present invention are concerned it is immaterial as to the specific type of fastener element withwhich the slider is to cooperate.

As here illustrated my improved slider comprises substantially parallel spaced front and rear wings 4 and 5 respectively united by a relatively narrow neck portion 6 and in these respects resembling in general the type of slider disclosed in the patent to Judson No; 788,317, dated April 25, 1905.

In preparing my improved slider I preferably proceed by first blanking out from sheet metal or other material of a suitable thickness a blank of substantially the shape shown inFig. 9. This blank comprises the wide upper part -1 which is adapted to form the front wing 1 of the slider, united by the relatively narrow part 6 which forms the neck of the slider, to the wide part 5 designed to form the rear wing 5 of the slider as above described. IVhen the slider is to be employed with fastener elements of the type shown in Fig. 1, I prefer to provide only the front wing 4: with inturned marginal guide flanges. To provide these flanges I form that portion 4; of the blank which is to make the front wing somewhat wider than the part 5 which is making the rear wing and by bend-' ing the blank along lines 7 and 8 in Fig. 10, I produce the guide flanges 7 and 8.

The flanges 7 and 8 constitute the outer guiding walls of the usual channels of the slider, and I preferably form the inner walls of these channels by providing the neck 6 with laterally extending tabs 9 and 1t) which may be bent along their lines of union with the neck proper so as to form the inner guiding elements 9 and 10, as indicated in Fig. 3, for example.

I provide openings 11 and 12 in the parts at and 5 at points spaced from but adjacent to the neck 6 and I also preferably provide an aperture 13 adjacent to the-free end of the part 4.

The free or lower end of the wing portion If of the blank is provided with an extension 11 adapted to constitute the reinforce member of the slider. and certain other parts to be described. This extension or reinforce member 1-1 is preferably of more or less lozenge shape and is provided with a central opening 15, preferably of diamond or generally similar shape. This opening thus divides the extension 1-1 so as to form the spaced strip- like portions 16 and 17 which diverge from each other and which are united at their ends to the strip- like portions 18 and 19 spaced from each other and which converge and unite at their lower ends. I provide inwardly directed tabs 20 and 21 extending into the opening 15 from the opposite edges thereof and substantially at the widest portion of the opening. Preferably these tabs incline downwardly and converge toward each other as shown in Fig. 9 for a purpose hereinafter to he described.

The lower ends of the strip members 18 and 19 merge into a relatively narrow part 22 (whose width is substantially equal to the combined widths of the parts 18 and 19) and,

as shown in Fig. 9, the part 22 is provided at its end with a tongue 23 which is adapted, in the completed slider, to extend through the opening 13 at the free end of the front wing 4.

Having prepared the blank in this manner the marginal edges of the wing 4 may be turned in as above described to form the flanges 'Z and 8 and the tabs 9 and 10 are likewisebent to form the inner guide elements, these parts being shown as thus bent out of the plane of the blank in Fig. 11. Either before, after, or simultaneously with this operation, in which the guiding elements are bent, I may bend the tabs 20 and 21 at .substantial right angles to the plane of the blank and in the opposite direction from the flanges 7 and 8, as shown in Fig. 11. I also bendthe part 22 along a line such for example as indicated at 24 in Fig. 10, so that its lower end is at right angles to the plane of the blank, as also shown in Fig. 11.

The next operation is to contract theextension portion 14 laterally so as substantially to close the opening 15, thus bringing the edges of the members 16 and 17 substantially into contact,-the edges of the parts 18 and 19 substantially into contact, and the tabs 20 and 21 into engagement. During this con-.-

traction of the extension 14, the metal flows or draws to such an extent that the tongues or tabs 20 and 21 assume the position shown in Fig. 11in which they register with each other and stand at right angles to the face of the blank. The blank is now bent along the lines of union of the neck 6 with the respective wing portions 4 and 5* so as to bring.

the latter into substantially parallel relation toconstitute the front and rear wings 4 and 5 respectively of the completed slider. This bending brings the openings 11 and 12 into substantial alignment.

I next bend the blank back along the line 14 (which is substantially at the junction of the wing 5 with the extension 14) so as to cause the parts 16 and 17 to lie substantially in contact with the outer face of the wing 5. As the parts are brought into this position, as indicated in 'Fig. 12, the tongues or tabs 20 and 21 pass through the openings 12 and 11 of the rear and front wings (such openings being in alignment) until the forward ends of the tongues 20 and 21 project, as shown in Fig. 12, beyond the front face of the front wing 5. I now bend these forwardly projecting ends of the tongues or tabs 20 and 21 preferably in opposite directions, as indicated in Figs. 5 and 7, to cause them to lie substantially flat against the front face of the front wing. If desired, I may secure these forwardly projecting ends'of the tabs to the wing by means of solder or otherwise, although bending is simpler and the use of solder is not usually necessary. The tongues 20 and 21 thus arranged constitute a rivet elongate in the direction of the axis of the slider and exemplifying connecting means cident to use. If desired, either before or.

after the tongues or tabs '20 have been passed through the openings in .the wings, I may i bevel the lower edges of these tongues or tabs, as shown at 20 in Fig.3. Such bevel: ing may be desirable since the tongues 20 and 21 not only act collectively as a. rivet or connecting element, but they also function as a separator or guide, cooperating with the inturned tabs 9 and 10 to define the guide channels for the opposed series of fastener elements. As indicated in Fig. 3 the tongues or tabs 20 and 21 are disposedbetween the lower ends of the guiding elements 9 and 10 so that these several elements in combination constitute a more or less wedge-shaped structure at the central part of the slider body adapted in well known manner to co operate with the fastener elements as the latter are brought intoengagement or are separated by the operation of the slider.

After the forward ends of the tongues or tabs 21 and 20 have been turned outwardly oroth'erwise secured, as above described, I next bend the blankalong a line such as indicated at 14 Fig. 10, so as to cause a portion of the blank to overlie the upper surface of the neck 6, as indicated at 2 5 in Figs. 2 and 4. I now again bend the blank as along the line 14 (Figs. 10 and 13) so as to cause the portions 18 and 19 to lie substantially parallel to the front wing 4. Preferably the bend 14 is at such a point that the parts 18 and 19 are spaced from the front surface of the wing 4, such parts 18 and 19 thus constituting a loop which is adapted to enter an opening 27 in the pull device 28. At this stage in the operation the pull device may be threaded over the end 23 of the blank, and after being properly positioned pon the parts 18 and 19, the end portioii'22fof the blank with its tongue 23 is pressed inwardly toward the wing 4 until the tongue 23 passes through the opening 13. The end of the tongue 23 may then be turnedoven against the inner surface of the front owing or may be-upset or secured by solder or in any other desired manner.

The fastener thus constructed, with the exception of the pull device, consists of a single unitary piece of sheet material comprising the front and rear wings, the neck, the inner and outer guiding elements, the rivet for employment of relatively unskilled labor. At the same time this slider possesses all of the desired characteristics of a commercial form of slider, being light in weight, thin in a front to rear direction, stiff and durable, and capable of working smoothly in cooperation with the opposed series of fastener elements.

In Figs. 14, 15 and 16 a slight modification is shown, the upper end 4" of the blank being indicated as provided with an extension 29 having tabs 30 projecting from its end. The lower end 22 of the extension member is shown as provided with notches 28 in its opposite edges but without the tongue 23 above described. In assembling the parts and after the slider elements have been brought substantially into the position shown in Fig. 13, the tabs 30 are inserted in the notches 2S and are then bent or pressed inwardly, as indicated in F ig; 16, thus firmly uniting the parts to one another. In Fig. 16 I have shown the front plate provided 7 with the marginal flanges 7 b and 8" and I have also shown the rear plate as provided with marginal flanges 7 and 8, this construction being particularly adapted for use with fastener elements of the general type shown in the British patcut to Kuhn-Moos above referred to or in the copending application ofPrentice and Legat No. 91,932, March 3, 1926,but so far as the broad invention is concerned it is immaterial whether the slider be provided with inar ginal flanges upon one or both wings.

Having thus described a'preferred mode of -n eu-iv class described which comprises as steps preparing a unitary sheet metal blank having parts shaped appropriately to constitute front and rear wings, a neck, and a fiat rivet member, bending the blank at the junctions of the neck and wings to bring the wingsinto substantially parallel relation, disposing the flat surface of the rivet member in a plane substantially parallel to the axis of the slider and in such a position relative to the wings and neck as to adapt it to serve as a separator guide for cooperation with opposed series of fastener elements, and causing the rivet memher to unite the wings.

3. That process of making a slider of the class described which comprises as steps preparing a unitary blank of sheet metal having parts shaped appropriately to form front and rear wings, a neck, and a reinforcing strip, and bending the blank to bring the wings into substantially parallel spaced relation and to cause the reinforce strip to assume a U-form embracing the neck and the wing members between its arms.

l. That process ofnlaking a slider of the class described which comprises as steps preparing a blank consisting of a unitary piece of sheet metal having front and rear wings united by a relatively narrow neck and having a reinforce portion united to one of the wings, bending the blank to bring the wings into substantially parallelrclation and bending the reinforce portion of the blank to cause it to lie substantially in contact with the outer surface of the wing with which it is procedure or process of producing sliders of united and to embrace the neck.

improved construction, together with certain forms of blank useful in the practice of such process, and with the understanding that the above process is susceptible of variations in respect to the order of ste )s, the number of steps, and the particular stlips employed, and that the process is not necessarily confined to the specific shape of blank herei'n described, but that the various steps and the particular order of such steps hereinabove described, as well as the shape of the blank, are merely illustrative and not restrictive of the invention.

I claim:

1. That rocess of making a slider of the class described which comprisesas steps preparing a sheet metal blank having parts shaped appropriately to constitute front and rear wings, a neck, and a fiat rivet member, bending the blank at the junctions of the neck and wings to bring the wings into substantially parallel relation, disposing the flat surface of the rivet member in a plane which is substantially perpendicular to the wings and parallel to the longitudinal axis of the slider, and causing the rivet member to unite the wings at a point spaced from the neck.

2. That process of making a slider of the 5. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a unitary piece of sheet metal having front and rear wings united by a relatively narrow neck and having a reinforce portion united to one of the wings. bending the blank to bring the wings into substantially parallel relation, and bending the reinforce portion of the blank to cause it to lie substantially in contact with the outer surface of one wing and. substantially V to conform to the outer surface of the neck.

6. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a unitary piece of sheet metal having front and rear wings united by a relatively narrow neck and having a reinforce portion united to one of the wings, bending the blank to bring the wings into substantially parallel relation, bending the reinforce portion of the blank to cause It to extend parallel tothe wing from which it projects,thence over the outer surface of the neck, and thence in substantially parallel relation to the other wing, and connect ing the free end of the reinforce member to the latter wing.

7. That process of making a slider of the class described which comprises as steps prewith the wing to cause it to extend along said wing, over the neck and substantially to the end of the other wing,. and uniting the engageable connecting elements of said latter wing and the reinforce member.

8. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a unitary piece of sheet metal having front and rear wings united by a relatively narrow neck and having a reinforce portion united to one of the wings, bending the blank to bring the wings intosubstantially parallel relation, and bending the reinforce portion of the blank to cause it to lie substantially parallel to the outer surface of the wing with which it is united and to cause it to extend around the neck and into substantially parallel relation to the outer surface of the other wing.

9. That process of making a slider of the class described which comprises as steps preparing a blank consisting of unitary piece of sheet metal having front and rear wings united by a relatively narrow neck and having a reinforce portion united to one of the wings, bending the blank to bring the wings into substantially parallel relation, bending the reinforce portion of the blank at a point adjacent to its union with the wing to cause it to lie substantially in contact with the outer surface of said wing, and uniting the reinforce device to said wing at a point adjacent to the junction of the latter with the neck, and uniting the reinforce to the free end of the other wing.

10. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a unitary piece of sheet metalhaving front and rear wings united by a relatively narrow neck and having a reinforce portion united to one of the wings, bending the blank to bring the wings into substantially parallel relation, bending the reinforce portion of the blank to cause it to extend in substantially parallel relation to the wing with which it is united, thence about the neck and in substantially parallel and spaced relation to the other wing, andconnecting the end of said reinforce portion to said latter wing adjacent to the free end of the latter.

11. That process of making a slider of the class described whichcomprises as steps preparing a blank consisting of a unitary piece tab, bending the rivet tab,to a position substantially perpendicular to the plane of the blank, bending the blank to bring the wings into substantially parallel relation with the openings in alignment, andbending the part carrying the rivet tab to cause the tab to extend transversely through the opening in the wing to which said part is attached and through the opening in the opposite wing, and so engaging the free end of the tab with the latter wing as to prevent separation of the wings.

12. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a unitary piece of sheet metal having wing portions united by a neck, the wings having apertures therethrough, and an extension projecting from the free end of one wing, said extension carrying a rivet tab, bending the rivet tab to a position substantially perpendicular to-the plane of the blank, bending the blank to bring the wings into substantially parallel relation, 7

and bending the extension to cause the rivet tab to project through the openings in the wings.

l8. Thatprocess of making a slider of the class described which comprises as steps preparing a blank consisting of a piece of sheet material having wings united at one end by a relatively narrow neck, each wing having an aperture at a point adjacent to its junction to the neck, and an extension projecting from one wing, said extension having an aperture therein, a tab projecting inwardly from the edge of the aperture, bending the tab to cause it to extend substantially perpendicularly to the plane of the blank, bending the blank to bring the wings into substantially parallel relation, bending the extension to cause the tab vto project through the apertures in both wings, and bending the free end of the tab to prevent its withdrawal.

' 14. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a piece of sheet material having wings united at one end by a relatively narrow neck, each Wing having an aperture at a point adjacent to its junction to the neck, an extension projecting from one wing, said extension having an aperture therein, and a rivet tab projecting inwardly from the edgeof said aperture, bending the rivet tab to cause it to project at an angle to the plane of the blank, contracting the extension laterally substantially to close the aperture therein, and bending the blank to cause the wings to assume a substantially 15. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a piece of sheet material having wings united at one end by a relatively narrow neck, each wing having an aperture at a point adjacent to its junction to the neck, and an extension projecting from one wing, said extension having a large aperture therein and tabs projecting inwardly from opposite sides of the aperture, bending the tabs tocause them to project at substantially right angles to the plane of the blank, contracting the extension laterally substantially to close the aperture and to bring the tabs into engagement, and bending the blank to bring the wings into substantially parallel relation and to pass the tabs through the openings in both wings.

16. That process of making a slider of the class described which comprises as steps preparing a blank consisting of a piece of sheet material having wings united at one end by a relatively narrow neck, each wing having an aperture at a point adjacent to its junction to the neck, and an extension projecting from one wing, said extension having a large aperture therein and tabs projecting inwardly from opposite sides of the aperture, bending the tabs to cause them to project at substantially right angles to the plane of the blank, contracting the extension laterally substantially to close the aperture and to bring the tabs into engagement, bending the blank to bring the wings into substantially'parallel relation with their apertures in alignment, bending the extension into substantially parallel relation to one wing thereby to projeet the tabs through the aligned openings in the wings, and bending the free ends of the tabs in opposite directions.

17. That process of making a sheet metal slider which comprises as preliminary steps preparing a blank having an aperture therein and a tab projecting inwardly from the edge of the aperture, bending the tab out of the plane of the blank, and contracting the blank laterally whereby substantially to close the aperture.

18. That process of making a sheet metal slider of the class described which comprises as preliminary steps preparing a blank having a diamond-shaped aperture therein and having tabs projecting inwardly from the edges of the aperture adjacent to the shorter axis of the latter, bending the tabs to cause them to project substantially at right angles to the plane of the blank, and contracting the blank laterally whereby substantially to close the aperture and thereby to bring the tabs substantially into engagement.

19. That process of making a slider of the class described which comprises as steps pre paring a blank consisting of a unitary piece of sheet metal having front and rear wings united by a relatively narrow neck portion and a reinforce member extending from the free end of one wing, each wing having an opening therethrough, the reinforce member being of lozenge shape and having a central diamond-shaped aperture and tabs projecting from opposite sides of the aperture at its widest part, the tabs being oblique to the axis of the blank and converging toward one another, bending the tabs substantially at right angles to the plane of the blank, contracting the reinforce member laterally substantially to'close the aperture and to bring the tabs into contact, bending the blank to bring the wings into substantially parallel relation, bending the reinforce member at its junction and the wing to cause it to lie parallel with the wing and to cause the tabs to project through the openings in the wings, and bending the ends of the tabs in opposite directions.

20. That process of making a slider of the class described which coniprisesas steps preparing a blank consisting of a unitary piece of sheet metal having front and rear W ng's united by a relatively narrow neck portion. a reinforce member extending from the free end of one wing, each wing having an opew ing therethrough, one wing at least having marginal flange portions and the neck having marginal tabs and the reinforce member having a pair of rivet tabs, bending the mnrginal portions of the wing and the tabs of the neck in the same direction to cause them to extend substantially perpendicular to the plane of the blank. bending the rivet tabs in the opposite direction. bending the blank at the neck to bring the wings into substantial- 1y parallel relation with the marginal wing tabs projecting inwardly. and bending the reinforccmembers to cause the rivet labs to pass through the openings in the \\'ings and to cause the reinforce member to extend over the neck and down to the free end of the other wing.

21. A blank for use in making a one-piece slider body for use with separable fasteners of the class described. said blank consisting of a unitary piece of sheet material having wing portions united by a relatively narrow neck, an extension united to the free end of one wing, and a rivet member integral with said extension at a. point intcrnwdiate the ends of the latter.

22. A blank for use in making a one-piec v slider body for use with separable fasteners of the class described, said blank consisting of a unitary piece of sheet material ha-vin g wing portions united by a relatively narrow neck, an extension united to the free end of one wing, and a pair of rivet tabs carried by said extension, said rivet tabs being located between the free ends of the extension and the point of union of the latter with the wing.

23. A blank for use inmaking a one-piece slider body for use with separable fasteners of the class described, said blank consisting of a unitary piece of sheet material having wing portions united by a relatively narrow neck, an extension projecting from the free end of one wing, said extension having an opening therein, and a rivet tab extending inwardly 1 from the edge of said opening.

24. A blank for use iii-making a one-piece slider body for use with separable fasteners 19 of the class described, said blank consisting of a unitary piece of sheet material having wing portions united by a relatively narrow neck. an extension projecting from the free end of one wing, said extension having an opening therein, and rivet tabs projecting diagonally inward, in converging relation, from opposite edges of the opening.

25. A blank for use in making a one-piece slider body for use with separable fasteners 20 of the class described, said blank consisting of a unitary piece of sheet material having wing portions united by a relatively narrow neck, guide tabs projecting from opposite edges of the neck, an extension projecting from the free end of one wing, rivet means carried by the extension, and means at the end of the extension for uniting it to the free end of the other wing.

26. A blank for use in making a one-piece slider body for use with separable fasteners of the class described, said blank consisting of a unitary piece of sheet material having owing portions united by a relatively narrow neck, an extension united to the free end of one wing, said extensioncterminating in a tongue said extension having a rivet tab substantially midway its length, the other wing having an opening adjacent to its-free end for the reception of said tongue, andeach wing having an opening near its junction with the neck for the passage of the rivet tab. 27. A blank for use in making a one-piece slider body for use with separable fasteners of the class described. said blank consisting of a unitary piece of sheet. material having wing portions united by arelativcly narrow neck, and a substantially lozenge-shaped extension united to the free end of one wing, said extension having a diamon tl-shaped central opening, rivet tabs'projecting toward one another at the widest part of the opening, and a connecting tongue projecting from the outer end of said lozenge-shaped extension, said tongue being adapted to engage an opening in the free end of the other wing.

Signed by me at Berlin, Conn, this nineteenth day of April. 1927.

GEORGE E. PRENTICE.

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