Inner springs for use in furniture and bedding and a producing method therefor
AssigneeMatsushita Industrial Co., Ltd.
InventorHiroyuki Eto
Life of this patent
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Abstract
An inner spring, for use in furniture and bedding, comprises coil springs which are encased in cylindrical casings having a predetermined number of spring casing portions, and which are continuously arranged in parallel. The axes of the coil springs are arranged in parallel, and at least a part of the coil springs encased in the spring casing portions are given different repulsions by varying their pitches and are set in place in the cylindrical spring casings to form a row of inner springs.
Claims7
An inner spring assembly comprising:
- at least one cylindrical spring casing having parallel casing portions;
- and
- a plurality of coil springs having identical outer diameters and being encased in said at least one cylindrical spring casing, each of said plurality of coil springs having a longitudinal axis and a uniform outer diameter and being arranged in one of said casing portions of said at least one cylindrical spring casing so as to form at least one row of coil springs having parallel longitudinal axes, wherein each of said at least one row of coil springs includes coil springs having different heights when said plurality of coil springs are in a free state.
An inner spring assembly comprising:
- at least one cylindrical spring casing having parallel casing portions;
- and
- a plurality of coil springs formed of wire having an identical gauge and being encased in said at least one cylindrical spring casing, each of said plurality of coil springs having a longitudinal axis and a uniform outer diameter and being arranged in one of said casing portions of said at least one cylindrical spring casing so as to form at least one row of coil springs having parallel longitudinal axes, wherein each of said at least one row of coil springs includes coil springs having different heights when said plurality of coil springs are in a free state.
An inner spring assembly comprising:
- at least one cylindrical spring casing;
- and
- a plurality of coil springs having identical outer diameters and being encased in said at least one cylindrical spring casing, each of said plurality of coil springs having a uniform outer diameter, said plurality of coil springs being arranged in said at least one cylindrical spring casing so as to form at least one row of coil springs, said plurality of coil springs including a first group of coil springs each having a first pitch and a second group of coil springs each having a second pitch, said first pitch being different than said second pitch, wherein each of said at least one row of coil springs includes at least one coil spring from said first group and at least one coil spring from said second group.
An inner spring assembly comprising:
- at least one cylindrical spring casing;
- and
- a plurality of coil springs formed of wire having an identical gauge and being encased in said at least one cylindrical spring casing, each of said plurality of coil springs having a uniform outer diameter, said plurality of coil springs being arranged in said at least one cylindrical spring casing so as to form at least one row of coil springs, said plurality of coil springs including a first soup of coil springs each having a first pitch and a second group of coil springs each having a second pitch, said first pitch being different than said second pitch, wherein each of said at least one row of coil springs includes at least one coil spring from said first group and at least one coil spring from said second group.
Dependencies are inferred from the claim text.