US2081396A - Slide fastener - Google Patents

Description

D. DYR ESEN SLIDE FASTENER May 25, 1937.

Original Filed Jul 21, 19:54

8 83/086 lb/lea Ina/Jani or .DdvcPelIyres en, y K/JAL KW Patented May 25, 1937 YPATENT OFFICE SLIDE FASTENER Didrick Dyresen, Billerica, Mass., assignor to United- Carr Fastener Corporation, Cambridge, Mass, a corporation of Massachusetts Original application July 21, 1934, Serial No.

736,368. Divided and this application March 20, 1935, Serial'No. 12,025

2 Claims. (Cl. 24-205) A My invention aims to provide improvements in sliders for use with multiple fasteners and in themethod of making slider bodies.

This application is a division of my prior ap- 5 plication Serial No. 136,368, filed July 21,' 1934 and relating to my novel method of making my fastener sliders.

In the drawing, which illustrates a preferred embodiment of my invention: I

Figure 1 is an elevational view of a portion of a multiple operable fastener installation showing my improved slider;

Fig. 2 is a side elevation of the slider;

Fig. 3 is a plan view of a portion of a strip showing the method of forming the reinforcing rib; Fig. 4 is a plan view of a portion of the strip showing the method of forming and blanking line 6-6 of Fig. l; and

taken on the line 1-1 of Fig. 2.

Referring now to the slider selected for illustration of my invention, I have shown one hav- I ing a body formed from a single piece of sheet metal without the use of rivets or other pieces to stiffen and strengthen the body as has been necessary heretofore. The particular slider i1- lustrated has a top plate portion i and a bottom plate portion 2 spaced a predetermined distance 35 from the top plate portion. Each plate portion has its side edges turned at substantially right angles to.form flanges 3 facing each other and spaced slight distances apart to permit passage of the stringers 4 and 5, when the slider passes 4 over the fastener elements 6 shown in Fig. 1. The plate portions I and 2 are joined together at one end by a hollow rib I which is more or less U-shaped and extends at least part 'way along the outer faces of the plate portions l and 45 2. This rib has sides which are preferably flat and relatively close together, thereby stiffening the slider body so that the plate portions I and 2 are held in fixed planes as against any ordinary stresses which may be exerted upon them in use. 50 That portion of the rib 'I located at the bottom of the slider, or in the bottom plate portion 2, is less pronounced than at the top side thereby overcoming any objectionable projection on the inner side of an installation to which the device 55. is to be applied. The rib portion at the top plate Fig. 7 is an enlarged section of the slider are deepest at their ends.

I may serve as a. means to receive and hold the usual pull-tab, as shown in Figs. 1 and 2. y

The plate portions are wider at the end where they are joined together by the rib than they are at their free-ends (Fig. 7). This is forthe purpose of providing for the necessary diverging channels. Cooperating. with the flanges 3 to form these channels are a pair of projections 8 extending from the rib toward the other end of the slider body. I have tapered these projectlons so that when they are bent together they form a comparatively sharp edge which greatly aids the operation of the slider.

In Figs. 3 and 4, I have illustrated portions of a strip of sheet metal such as is-used in the manufacture of my invention, and clearly showing the successive steps in the forming of the slider. Beginning at A (Fig. 3) and proceeding through D, the steps consist of simple drawing operations which form the rib l, in this illustration extending downwardly from the visible side.

Step' E is the final drawing operation upon the rib and includes swaging a pair of depressions on opposite sides of the rib which later form the projections t. 'I'hese depressions become regularly deeper toward their outer ends and The next step F consists in piercing the holes 9, which mark the free ends of the plate portions l and 2 and leave a small connecting link ill between the slider blanks so that they may be fed in a strip through the press. In operation F I also pierce out the portions ll, thereby delineating the ends of the plates I and 2 which are adjacent to the neck portion when the slider is completed. .It will, be noticed that one end of the rib is tapered to a comparatively thin point. This is the end that lies along the back plate. It also extends further toward the free end of the slider than the rib on the other plate. This is because it is necessary to have a more pronounced projection on the front plate for the purpose of attaching the pull member.- This piercing operation also cuts away the portions of the strip around the depressions leaving the projections 8, which taper toward their free ends as described above. In step G, I commence the forming of the side flanges 3. This is a. combined drawing and bending operation which results in making the flanges thinner than the plates when finished. After the first flange-forming operation as at G, the sides of the plate portions l and 2 are freed by the blanking operation as at step H. During this operation the flanges 3 are completed. At step I, the portions l2 of the rib, be

tween the projections 8 and the plate portions are swaged and curved toward each other until they meet and form tubular portions at each side of the projections. This is for the purpose of making the rib more rigid and of presenting a neater and more compact finishedslider. The final operation in this particular series is that of separating the partly finished slider from the strip as at l3 in step J.

Now there remains the bending of the rib to make the plates l and 2 lie in parallel planes.

This is done so that the plates exactly overlie one another and their flanges extend directly toward each other with a space between them to permit the passage of the fastener stringers. At this point the projections 8 are bent toward each other until they meet, their tapered ends forming a neat and smooth joint. The final step is that of sizing the slider to the very exact dimensions demanded by the. nature of the task it is to perform. The pull-tab may be attached to the rib on the front face of the slider by any suitable method. I preier to drill holes in the rib to receive the connecting link of the tab (Figs. 1 and 2). i

The slider I have described is simple, sturdy and neat in appearance. By virtue of its rib it will resist unusual strains in all directions. The method I have invented for making the slider is novel and simple, easily and inexpensively performed.

While I have illustrated and described a form of my invention, I do not wish to be limited thereby, since the scope of my invention is best defined by the following claims.

I claim:

1. A sheet metal slider for multiple fasteners having a body formed from a single piece of metal and having spaced top and bottom plates, a hollow stifiening rib providing the sole means joining said plates together in predetermined spaced relationship, the cross-sectional depth of the hollow of said rib at its greatest point being substantially greater than the thickness of the material of said rib adjacent said hollow, and a pair of ears integral with said rib and extending into the space between said plates to form diverging channels.

2. A sheet metal slider for multiple fasteners having a body formed from a single piece of metal and having spaced top and bottom plates, a relatively deeply hollowed stiffening rib providing the sole means joining said plates together in predetermined spaced relationship, and integral projecting means extending directly inwardly from the edges of said rib into the space between said plates to form diverging channels.

DIDRICK DYRESEN-

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