US2791783A

US2791783A - Spring cushion assembly

Info

Publication number: US2791783A
Application number: US384874A
Authority: US
Inventors: Murray J Rymland
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-10-08
Filing date: 1953-10-08
Publication date: 1957-05-14
Anticipated expiration: 1974-05-14

Description

May 14, 1957 M. J. RYMLAND spams cusmou ASSEMBLY Filed Oct 8, 1953 INVENTOR Maria rlflymknl BY )W ATTORNEYS United States Patent,

SPRING CUSHION ASSEMBLY Murray J. Rymland, Baltimore, Mil.

Application October 8, 1953, Serial No..3814,87.4

2 Claims. (Cl. -275) 1953, and the present invention represents a. variation and improvement of the structure therein claimed.

Among the general objects of the present invention are to provide a spring cushion assembly adapted to distribute applied pressure smoothly and evenly, and to provide an assembly of simplified, durable and inexpensive construction, wherein lateral displacement of component coil springs is efiectively prevented.

A particular object of the invention is to provide a spring cushion assembly employing elongated metal straps to secure the rows of springs, whereby the overall assembly is effectively stiffened, and the length of each spring row is positively established and maintained.

Another object is to provide a spring cushion unit adapted for semi-automatic and automatic assembly.

A further object is to provide a spring cushion assembly adapted to prevent padding or filling material from entering into the component springs thereof, when utilized in mattresses, upholstered furniture or the like. Further objects of the invention will be in part obvious and in part pointed out hereinafter.

The invention and the novel features thereof may best be made celar from the following description and the accompanying drawings, in which:

Figure 1 is a fragmentary plan view of a spring cushion assembly constructed according to the present invention;

Figure 2 is an elevational view of the cushion assembly section illustrated in Figure 1;

Figure 3 is 'an enlarged view taken on the line 33 of Figure 1, looking toward an end of the novel securing strap;

Figure 4 is a sectional view on the line 44 of Figure 3;

Figure 5 is an enlarged sectional view taken on the line 5-5 of Figure 1;

Figure 6 is an enlarged sectional view taken on the line 66 of Figure l, and

Figure 7 is an enlarged sectional view taken on the line 7-7 of Figure 1.

Referring to the drawings in detail, the spring cushion assembly comprises a plurality of component helical coil springs .10, constructed of wire in conventional form as illustrated in Figures 1 and 2. Each row of springs is aligned and arranged with an arcuate portion of the end convolution of each spring overlapping a corresponding portion of an adjacent spring in the same row, whereby one such portion becomes an overlying arcuate portion 11 and the other an underlying arcuate portion 12, and a space 13 is provided between the overlapping portions.

To fix adjacent rows in desired parallel spaced relationship, a plurality of tie wires 14 extend transversely of the rows along the lines of overlap between the coils.

2 Each tie wire 14 is provided with a plurality of pairs of spaced depressions 15, each pair of depressions being separated by an upwardly projecting insert 16 therebetween, as best illustrated in Figures 3 and' 7'. When positioned in the assembly, each pair of depressions 15 partially embraces the intersecting sections 17 of an overlapping pair of

arcuate portions

11 and 12, and the intermediate insert :16 projects into the space 16 therebetween. As will be readily understood, the pairs of depressions 15v are spaced along the, length of tie wires 14' to suitably space from each other adjacent rows, of component spring-s, the structure illustrated in Figure 1 being merely a partial view of one spring row of the overall assembly.

in; my prior patent referred to, the overlapping arcuate portionszof adjacent springs in a row are secured to. each otherand' to the tie wire insertsby individual clamp members firmly'engaged to those elements. While. such structural relationship is entirely satisfactory, i have now discovered. that: for some applications further advantages reside; in employing along each row of springs elongated metal straps =18 of substantial width, arranged to pass underthe insert of each tie wire. and over the overlapping arcuate. portions; of the springs. Each strap, 18: extends the length of a spring row, replacing accordingly a plurality of'individual clamp members;

The strap. 18 underlying. inserts 16 or the; tie wires and overlying the overlapping arcuate portions 11 and .11 of the individual springs eifectively retains the intersecting sections 17 of the arcuate portions in the depressions 1-5 of the tie wires, whereby lateral movement of the springs relative to each other or axially'of the tie wires is eifectively prevented. This locking function of the strap is illustrated in Figure 5. To similarly prevent lateral displacement of the springs in the direction of the row, each strap may be permanently and reversely crimped at suitable intervals, to form therein humps 19 adapted to underlie and partially enclose the tie wire inserts, and adajcen-t humps 20 adapted to overlie and partially enclose the adjacent overlying arcuate spring portion 11, see Figure 6. The crimps or humps 19, 20 are obviously spaced along the strap length to establish and maintain the desired position of each spring in the row. 'In this manner,--the overall length of the spring row is positively established and firmly maintained.

Each end section 21 of the strap 18 may be reversely bent as at 22 (see Figures 3 and 4) about the end pair of

arcuate portions

11 and 12 in the row, and permanently crimped to :form a hump 23 partially enclosing the end underlying arcuate portion 12. -In this manner, the relative position of each component spring of the row is permanently fixed, including the end springs thereof which are not traversed by the straps.

The straps, as will be readily understood, serve to effectively stiffen the overall assembly, particularly to resist endwise pressures exerted against the assembly in the row direction. The straps also establish and maintain the desired length and spacing of each spring row. Since they overlie the individual component springs, they also serve, when assembled in mattresses or furniture, to prevent the entry of padding or filling material into the interior of the coils. The latter tunction is enhanced by the substantial width of the straps. The fiat strap configuration of the members 18 facilitates speedy and semi-automatic or automatic assembly of the units, since they may be readily positioned, either manually or mechanically, between the tie wires and the overlapping portions of the end convolutions of the springs in the process of assembly.

It will thus be seen that there has been provided by this invention a structure in which the various objects hereinbefore set forth, together with many practical ad- 3 vantages, are successfully achieved. As various possible embodiments may be made of the mechanical features of the above invention, all without departing from the scope thereof, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative, and not in a limiting sense;

I claim:

1. -A spring cushion assembly comprising a plurality of parallel rows of similar helical coil springs having their axes arranged in parallelism, each spring having an arcuate portion of an end convolution thereof so overlapping a a corresponding portion of an adjacent spring in the same row as to provide a space between such overlapping portions, a plurality of tie wires extending transversely of the rows along the lines of overlap between the coils, each tie Wire having a plurality of pairs of spaced depressions with upwardly projecting inserts therebetween, the depressions of each pair being disposed in embracing relation to the overlapping points of a pair of adjacent arcuate spring portions with the intermediate insert projecting into the space between said arcuate portions, and a metal strap of substantial width extending along each row under the intermediate insert of each tie wire and over the arcuate portions of said springs, said metal straps being humped to partially enclose each tie wire 25 ate portion of an end convolution thereof so overlapping a corresponding portion of an adjacent spring in the same row as to provide a space between such overlapping portions, a plurality of tie wires extending transversely of the rows along the lines of overlap between the coils, each tie wire having a plurality of pairs of spaced dcpressions with upwardly projecting inserts therebetween, the depressions of each pair being disposed in embracing relation to the overlapping points of a pair of adjacent arouate spring portions with the intermediate insert projecting into the space between said arcuate portions, and a metal strap of substantial width extending along each row under the intermediate insert of each tie wire and over the arcuate portions of said springs, said metal straps being in tight frictional engagement with each tie wire insert and with at least one of the corresponding :areuate portions of said springs to resist relative lateral movement between adjacent overlapping springs.

References Cited in the file of this patent UNITED STATES PATENTS 530,248 Stoll I Dec. 4, 1894 819,674 Pennepaoker May 1, 1906 1,853,247 Winders Apr. 12, 1932 2,050,105 Lewis Aug. 4, 1936 2,630,586 Rymland Mar. 10, 1953 FOREIGN PATENTS 130,506 Australia Sept. 4, 1947 356,469 Great Britain Sept. 10, 1931