Woven spring unit
AssigneeSpiller Spring Company
InventorsWallace J. Rakow, Elmer J. Millette, Peter J. Johnston
Life of this patent
Estimating the term…
Abstract
A rigid spring unit is constructed of coil springs and a top grid comprising a plurality of wires, including a first group or pair of parallel wires spaced apart a distance less than the diameter of the top coil of each spring. A second group of three wires, at right angles to the first pair, includes a pair of outside wires spaced apart a distance less than the diameter of the top coil of the spring and a locking wire intermediate the outside wires. The top coil of each spring includes indentations that permit the top coil to be seated from below, in a pre-stressed, woven fashion into the wires of the top grid.
Claims7
A spring unit comprising:
- coil spring means having a generally circular top coil and lower coils;
- a top grid portion having a first group or straight, undeformed wires and having a second group of straight, undeformed wires extending transversely to said first group;
- said first group of wires comprising a pair of straight, undeformed wire members;
- said second group of wires including straight, undeformed outside wire members spaced apart and including a straight, undeformed locking wire member located between said outside wire members and intersecting each of said wire members in said first group of wires;
- said top coil including means for overlapping in a radially outward direction and engaging said outside wire members of said second group of wires;
- said top coil also including means for underlapping and receiving said locking wire member at a pair of locations each adjacent the intersection of said locking wire member and a respective wire member of said first group of wires;
- and,
- means, including said overlapping means on said top coil, for biasing the top coil into woven attachment with the top grid portion;
- said underlapping means on the top coil and said locking wire members compising means cooperating to hold said overlapping means in engagement with said outside wires members.
A spring unit comprising:
- a top grid having first pairs of straight, undeformed wires extending in a first direction and second pairs of straight, undeformed wires extending in a transverse direction to the first pairs;
- means joining said pairs of wires at their points of intersection and providing a plurality of undeformed coil supports;
- straight, undeformed locking wires positioned between each of said second pairs of wires and dividing said coil supports into a plurality of rectangles;
- each of said locking wires intersecting both wires in a respective one of said first pair of wires;
- and
- coil springs having circular top coils ;
- said coil springs being arranged in rows extending at right angles to each other;
- said circular top coils each having engaging means comprising (a) one set of indentations for overlapping in a radially outward direction and engaging the second pair of wires of a coil support and (b) another set of indentations for underlapping and receiving said locking wire of said coil support at a pair of locations on said locking wire each adjacent the intersection of the locking wire and a respective wire in the corresponding first pair of wires, to bias said top coil into woven attachment with said top grid;
- said underlapping set of indentations on the top coil and said locking wire comprising means cooperating to hold said overlapping set of indentations in engagement with said second pair of wires.
Dependencies are inferred from the claim text.