US1635094A - Sand bag - Google Patents

Description

E. NESTLER July 5, 1927.

SAND BAG Filed Jul 2, 192a INVENTOR WITNESSES 544d:

ATTORNEYS Patented July 5, 1927.

UNITED STATES g 1,635,094 PATENT, OFFICE.

EMIL NnsrLnR, or NEW YORK, n. Y.

SAND BAG.

. AppIication filed July 2. 1926. Serial No. 120,183.

This invention relates to sand bags and more particularly tosand bags adapted for use within a tire or shoe to receive pressure and to hold the tire or shoe in shape when under pressure during the vulcanizing process, particularly with relation to the outer portion of the shoe or tire.

I am of course aware that sand bags have been used for the same purpose, such bags being made of fabric or other inelastic woven material, the bag as a whole being straight so that when it is placed within a shoe or tire and pressure applied thereon the inner portion of the bag is wrinkled and the outer portion is subjected to overstretch or undue strain. Asa result, these bags have a very short life as either the stitching connecting the portions of the bag or the material thereof breaks due to the pressures.

It is therefore the broad idea of my invention toprovide a bag which has a natural curve both longitudinally and transversely to conform to the'interior of the tire or shoe; furthermore, to provide such a bag with stitching which will permit of expansion or contraction Without putting undue strain upon the bag. I

By reason of these two essential elements the bag maintains its natural position or shape, the flexible stitching permitting free movement to a larger or smaller radius without buckling or stretching the fabric of the bag. When pressure is applied it is always upon the smaller radius, the higher points of the wave pockets receiving the pressure first and therefore forcing the sand toward the center, thus filling out the sand bag in such a way that no wrinkling or buckling can take place.

A further object is to provide a bag in which the fabric is cut so that the weave is bias to the longitudinal axis of the bag, which permits maximum of stretching or movement of the material and gives to the material a maximum of eificierncy for the purpose intended.

With these and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts, which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a view in side "elevation, showing my improved bag filled with sand and ready for use;

Figure 2 is a view in cross section, show mg my improved bag in operative position; Figure 3 1s a view in transverse section of the bag'before it is filled with sand;

Figure 4 is a diagrammatic view, illustrating one manner of cutting the bag members from a sheet of fabric in order to give the desired bias weave to the bag.

A represents my improved bag which is composed of two pieces 1 and 2, preferably of woven fabric of suflicient strength and durability for the purpose intended. These pieces 1 and 2 are cut in the arc of a circle, and I illustrate in Figure 4 one manner of forming these pieces which consists in cutting the same on the line 3 from a sheet 4 in such a manner as to give a bias weave to certain flexibility and movement of the threads of the material itself so as to compensate for pressures in varying positions and greatly lengthen the life of the bag.

These two pieces 1 and 2 are flat and have preferably at their outer edges inwardly turned portions 5 secured together by a line of stitching 6. The inner portions of the pieces 1 and 2 are secured together by a wavy line of stitching 7 which allows for movementof the bag in various directions without breaking the stitching. In other words, this stitching 7 is in a real sense flexible, and the pressure on the bag causing the material to take various shapes and contours will be compensated for by the wavy line of stitching and the threads will not break as they would if the line of stitching is straight.

The ends of the bag are open and when the bag is filled with sand these ends are gathered together and closed by binding cords 8, or other means.

In Figure 2 Iillustrate the bag in position in a shoe 9, the latter in a mold 10. with a plunger 11 exerting pressure on the bag to maintain the shoe in engagement with the mold. The parts 10 and 11, constituting no part of the present invention, are illustrated in dot and dash lines.

It isthis broad idea of a curved fabric bag which constitutes the broad idea of my invention, and more specifically the provision of a bag of this character having a Wavy line of stitching at its inner portion and the material of bias Weave which I desire to cover.

Various slight changes and alterations .the material of the strip which allows for I might be made in the general form of the parts described Without departing from my invention and hence I do not limit myself to the precise details set forth but consider myself at liberty to make such slight changes and alterations as fairly fall Within the spirit and scope of the appended claims.

I claim:

1. sand bag of the character described, comprising a casing composed of fabric, the sections thereof being connected at the inner portion of the bag by a flexible line of stitching, said casing being curved longitudinally in the arc of a circle and adapted to be filled with sand and the like.

2. A sand bag composed of two sections of bias Weave fabric, curved in the arc of a circle, said sections securedtogether at their inner and outer portions by lines of stitohmg.

EMIL N GSTLER.

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