| 摘要 |
PROBLEM TO BE SOLVED: To provide a spring for mattresses which is light in weight and easy to handle, has a good matching property to fiber blank parts of side fabrics, etc., and is good in productivity as well by detaining respective springs to respective upper and lower net-like plane members and integrating these springs in such a manner that the respective springs are held between the layers of a pair of the upper and lower net-like plane members. SOLUTION: The spring 100 for mattresses comprises a pair of the upper and lower net-like plane members 1, 2 and the many springs 3 which is held between these layers. The net-like plane members 1, 2 are integrally formed by using a synthetic resin material. Many annular members 11, 21 slightly broader in width than the annular members 31, 32 at the top ends or bottom ends of the springs 3 are flatly connected according to the shapes of these annular members and are provided with the detaining members 16, 26 at 3 points each at equal intervals in the circumferential direction of the respective annular members 11, 21. The springs 3 comprise the central annular members 33, the annular members 31, 32 arranged on both top and bottom sides thereof and plural elastic connecting members 34 connecting these members to each other. |
