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US 6,170,808 B2Granted
Spring core for mattress or cushion
OwnerFranz Kutschiinventor
Life of this patent
Estimating the term…
Abstract
The invention relates to a spring core for mattresses and seat cushions with leaf springs. The spring core consists of a plurality of spring elements bent up out of passages punched in a plate, with each spring element having an upper and a lower spring clip, with the upper spring clip bent up out of a passage punched in the lower spring clip. The spring elements can also be coated with extruded foam.
Claims8
A leaf spring core for mattresses and seat cushions comprising:
- a plurality of spring elements bent up out of passages punched in a plate, including a plurality of lower spring clips bent up out of first pairs of said passages punched in said plate and a plurality of upper spring clips bent up out of second pairs of said passages punched in said lower spring clips, and
- a coating of foam,
- wherein said plurality of spring elements contain interior portions which are free of said foam and
- said plurality of lower spring clips and said plate define a plurality of lower exterior spaces that are also free of said foam.
1 more element
A method of forming a leaf spring core, comprising the steps of:
- producing a plate with at least one set of passages, each set defining first and second portions of said plate;
- forming a lower spring clip by bending said first portion;
- forming an upper spring clip by bending said second portion attached to said first portion,
- wherein said lower spring clip and said upper spring clip form a spring element;
- defining an interior space formed between said lower spring clip and said upper spring clip;
- defining an exterior space formed between said lower spring clip and said plate;
- coating said spring element with foam;
- leaving said interior space essentially free of foam;
- and
- leaving said exterior space essentially free of foam.
7 more elements
A spring core for mattresses and cushions, comprising:
- a plurality of separate spring elements arranged on a plate in a planar configuration and separated from each other by a space, each of said spring elements including:
- a lower spring clip approximately shaped as a leaf spring;
- an upper spring clip approximately shaped as an inverted leaf spring and attached to said lower spring clip;
- a coating of foam;
- an interior formed between said lower spring clip and said upper spring clip and an exterior space between said lower spring clip and said plate being substantially free of said foam,
- wherein said upper spring clip and said lower spring clip are formed from a single planar piece of material.
3 more elements
A method of forming a spring core, comprising the steps of:
- producing a plate with at least one set of passages, each set of passages defining a spring-producing area;
- forming a lower spring clip by bending a first portion of said spring-producing area;
- forming an upper spring clip by bending a second portion of said spring-producing area attached to said first portion;
- defining an interior formed between said lower spring clip and said upper spring clip;
- surrounding said spring element with foam;
- leaving said interior essentially free of foam;
- and
- leaving an area between said lower spring clip and said plate essentially free of foam.
5 more elements
Dependencies are inferred from the claim text.