US2240051A - Cushion spring structure - Google Patents

Description

Apri! 29, 1941; A, 'MA L Y 2,240,051

CUSHION SPRING STRUCTURE Filed May 16, 1938 /.6 IN\,/EN TOR. I

' 1 BY AnZ/wyJOflaZlg ATTORNEYS 0 Patented Apr. 29, 1941 UNITED ES PE CUSHION SPRING STRUCTURE Application May 16, 1938, Serial No. 208,214

1 Claim.

This invention relates to cushion spring structures of the type which consist of a plurality of rows of coiled expansion springs arranged in side by side relation with the end convolutions of adjacent springs joined together to provide an assemblage which is utilized for various purposes such as in seat cushions, chair seats, innerspring mattresses and the like.

The present invention broadly comprehends an improved spring structure and method of producing the same from which many advantages are gained over those previously in use, notably smooth, flush surfaces are provided throughout so as to avoid undue wear on the filling or cutting of the covering fabric, while greatly facilitating the initial application of the covering material to sion springs of a cushion spring structure, 13

the spring structure or its removal therefrom and determined spaced relation, thus obviating distortion and shortening of the structure which results in loosening of the cover.

The invention also embodies an improved means for connecting the ends of the frame wires and the end convolutions of the spring elements which eliminates welding or other previous types of connection between the ends of said frame wires and serves to retain the springs in proper relation to the frame wires.

With the above enumerated and other objects in view, the invention is set forth in greater detail in the following specification and illustrated in the accompanying drawing in which:

Fig. 1 is a fragmentary plan view of a cushion spring structure constructed in accordance with one form of the invention.

Fig. 2 is a vertical sectional view therethrough taken approximately on the line 2-2 of Fig. 1.

Fig. 3 is a fragmentary transverse sectional view taken approximately on the line 3-3 of Fig. 1.

Fig, 4 is an enlarged fragmentary sectional View taken approximately on the line 4-4 of Fig. 1.

Fig. 5 is a fragmentary collective perspective the spacing wires and. C the frame wires. The coiled expansion springs A are arranged as usual in a plurality of rows in side by side relation with the end convolutions H) of the adjacent springs of each row joined together and to the spacing wires B and the frame wires C by means of clips D.

In order to dispose the surfaces of the clips flush with or below the plane of the spring structure, the end convolutions [0 are provided with inwardly offset portions H, the spacing wires B with inwardly offset portions I2 and the frame wires C with inwardly offset portions l3, the inward offsetting of said elements being such as to dispose the same inwardly of the planes of the spring structure a sufficient distance whereby the surfaces of the clips D will be within the confines of the surface planes of the structure when the clips surround the connected elements.

The offsetting of the portions I I, I2 and I3 may be accomplished either prior to the application of the clips or subsequent to the application of the same and in either event it will be apparent that the arrangement will prevent undue wear on the filling or cutting of the covering fabric, while the smooth fiush surfaces thus provided will greatly facilitate the initial application of the covering material to the spring structure or its removal therefrom and re-application thereto should repairs or adjustments be required.

In addition to this the eccentric arrangement of the clips in surrounding relation to the offset portions II, l2 and IS with reference to the axis of the major portion of the members will prevent permanent canting of the clips or overlapping of the spring elements which result in noise and distortion of the structure due to the fact that there is an inherent tendency of the clips and spring elements to return to their normal plane. It will be further noted that the offsetting of the elements and the arrangement of the clips in embracing relation to said offset portions effectually locks and retains the spring elements in their predetermined relation and avoids distortion and shortening of the structure which would result in If desired, as illustrated in Fig. 7 of the drawing, the clip E disclosed therein together with the offset portion [6 of the wire element I! may be bent to an arcuate longitudinal form to further more efiectually look and retain the elements in connected relation.

What is claimed is:

In a cushion spring of the type which includes a plurality of rows of coiled expansion springs arranged in side by side relation with the opposite end convolutions thereof respectively disposed and secured in common planes parallel to each other, upper and lower frame wires surrounding the opposite end convolutions of the outermost springs, said frame wires respectively having their ends overlapped and provided with mating inwardly offset portions, the spring convolutions adjacent said overlapped ends having oil'set portions registering with the offset portions of the overlapped ends of the frame Wires, and clips surrounding said registering overlapped portions and constituting a common means for joining the overlapped ends of the frame wires and for connecting the same with the adjacent springs.

ANTHONY J. OMALLEY.

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