Construction for bed or chair

{
  "publication_number": "US3604027A",
  "country": "US",
  "kind": "A",
  "title": "Construction for bed or chair",
  "abstract": "A bed or chair construction is provided with a plurality of helical springs for resiliently supporting a horizontal top plate above the frame. At least one electromagnet is secured to each of the top plate and the frame, and the electrical circuit for the electromagnets energizes the electromagnets in such a manner that the facing portions of the electromagnets on the top plate and on the frame have the same magnetic polarity. The electrical circuit also includes a variable resistor for varying the magnetic force.",
  "claims": [
    "1. A construction for a bed or chair comprising a horizontal frame having supporting legs therebeneath, a plurality of compressible coil springs above the frame, a horizontal top plate supported by the springs, the axes of the coils extending vertically whereby the top plate is elastically supported by the springs, at least a pair of electromagnets, one of the electromagnets being secured to the frame and the other electromagnet being secured to the top plate and being spaced from the first electromagnet, an electrical circuit having a variable resistor for energizing the electromagnets to provide the facing portions of each electromagnet with the same magnetic polarity.",
    "2. The construction of claim 1 including a plurality of pairs of electromagnets, one electromagnet of each pair being secured to the frame and the other electromagnet of each pair being secured to the top plate and being spaced from the first electromagnet of the pair, the electromagnets of each pair being energized to provide the facing portions thereof with the same magnetic polarity."
  ],
  "cpc": [
    "A47C 23/043",
    "A47C 31/003",
    "Y10S 5/906",
    "Y10S 5/936"
  ],
  "assignees": [
    "SHUNICHI KONNO"
  ],
  "filing_date": "1969-08-04",
  "publication_date": "1971-09-14",
  "grant_date": "1971-09-14",
  "priority_date": "1969-08-04",
  "application_number": "US-3604027D-A",
  "family_id": "25299649",
  "citations": [
    "US2476605A",
    "US2529268A",
    "US2599723A",
    "US2614270A",
    "US3090239A",
    "US3467973A"
  ]
}