Spring devices – Spring panel – Spring panel comprises vertically oriented compressible coil...
Patent
1988-11-23
1989-12-12
Larson, Lowell A.
Spring devices
Spring panel
Spring panel comprises vertically oriented compressible coil...
140 3CA, 140 89, F16F 304, B21F 2716
Patent
active
048862495
DESCRIPTION:
BRIEF SUMMARY
This invention relates to spring bands for incorporation in spring units. Spring units can be incorporated in mattresses, seats, cushions and other products.
The invention is particularly concerned with spring units comprising an assembly of spring bands and helical wires. Each of the spring bands is of a known kind (hereinafter referred to as a spring band of the kind specified) comprising a length of wire bent so as to form a plurality of coil springs disposed side by side in a row, ends of the coil springs lying in or near opposed edge faces of the band, and a plurality of connectors integral with the springs, each such connector lying in or near an edge face of the band and serving to interconnect two adjacent springs in the row, and each connector having two spaced end portions, which extend transversely of the band, with an intermediate portion, between said end portions, which extends past said two adjacent springs.
Spring bands of the kind specified can be assembled together to form a spring unit of a known kind (hereinafter referred to as a spring unit of the kind specified) comprising a plurality of spring bands, each of the kind specified, disposed side by side so that their edge faces lie in or near main faces of the unit, and a plurality of helical wires, some lying in or near one of said main faces and others lying in or near the other of said main faces and each helical wire embracing component portions of each band, namely two adjacent end portions of two neighbouring connectors.
In the manufacture of spring units of the kind specified it is the usual practice first to make long lengths of spring bands, and to wind up each band to form a roll as successive springs are formed. A plurality of such rolls are then taken to an assembly machine where they are progressively unwound and fed to a linking station where helical wires are attached to them. When a sufficient number of helical wires has been attached to the spring bands to form a spring unit of a desired length, the unit is detached. A machine suitable for assembling bands of springs is described and illustrated in the complete specification of British patent No. 1 095 980, granted to Multilastic Limited, and the detachment of individual spring units is described and illustrated in the complete specifications of British patents Nos. 1 104 884 and 1 183 315, also granted to Multilastic Limited.
The method of assembly outlined above therefore requires the preliminary manufacture of long lengths of spring bands. This is normally carried out by means of machines of the kind described and illustrated in the complete specification of British patent No. 937 644, granted to Willi Gerstorfer. Slight variations in the hardness or other physical properties of the wire may well result in slight variations in the dimensions of the resultant spring bands from a single machine. Moreover it has often been the practice to employ several machines for the production of spring bands and to use, at random, spring bands produced by different machines. Slight variations in the settings of the machines are also likely to result in slight variations in the dimensions of the resultant spring bands. Most of these variations are largely unimportant in view of the resilience of the bands and of the spring units assembled from them. However, it is found that variations in the spacing between end portions of the connectors may lead to problems.
The aim of the present invention is to enable those problems to be overcome or at least reduced.
From one aspect the present invention consists in a method of making a spring band for incorporation in a spring unit, the method comprising subjecting a length of wire to an initial bending operation in which it is shaped to form both a plurality of coil springs disposed side-by-side in a row, ends of the coil springs lying in or near opposed edge faces of the band, and a plurality of connectors integral with the springs, each connector lying in or near an edge face of the band and serving to interconnect two adjacent springs in th
REFERENCES:
patent: 4112726 (1978-09-01), Adams et al.
patent: 4771494 (1988-09-01), Zapletal et al.
Docker Leslie T.
Whittleworth William
Larson Lowell A.
Multilastic Limited
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