Beds – Bedsteads – Having bottom
Patent
1988-06-12
1990-06-26
Trettel, Michael F.
Beds
Bedsteads
Having bottom
5446, 5 6, 267148, 267158, 267 47, A47C 2308
Patent
active
049359770
ABSTRACT:
A leaf spring includes a plate having a thickness of between approximately 5 mm and 20 mm, a width of between approximately 20 mm and 200 mm, and a given length. The plate is arcuately deformed so that it includes a central portion with a height of between 20 mm and 40 mm. The plate exhibits a predetermined resiliency for maintaining the plate in a substantially horizontal position under a load of between 5 kg and 30 kg and for preventing the plate from breaking under a load of between 50 kg and 100 kg. Further, the plate includes first and second layers made of glass-fiber or carbon-fiber and a core member made of a polyurethane foam material positioned between the first and second layers.
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patent: 4589151 (1986-05-01), Behrens
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Trettel Michael F.
Yamada Co., Ltd.
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