US4296965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seat with adjustable lumbar supporter
Assignee: Tachi S Co Ltd
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Filing: 1979-07-11
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Granted: 1981-10-27
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Expires: 1999-07-11
Abstract
Abstract A backrest of a seat has therein an adjustable lumbar supporter which comprises a first rod member transversely crossing two side brackets of the backrest to be rotatable about the axis thereof, an arm member secured at one end to the first rod member, a second rod member rotatably supported by the arm member, a lumbar supporter proper fixed to the second rod member, a first control mechanism for forcing the lumbar supporter proper to swing about the axis of the first rod member when operated, and a second control mechanism for forcing the lumbar supporter proper to swing about the axis of the second rod member when operated.
Inventors
- 👤 Kenichi Sakurada
- 👤 Takaichi Nishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:39
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/46; A47C7/462
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
352 words
A seat with a backrest having spaced support portions by which a contourable portion constituted by padding means is supported, and an adjustable lumbar supporter for imparting a curvature to said contourable portion to produce a desired contour, said lumbar supporter comprising: a first rod member transversely crossing said support portions in a manner so as to be rotatable about the axis thereof relative to said support portions; an arm member secured at its one portion to said first rod member to be rotatable therewith; a second rod member held by said arm member in a manner so as to be rotatable about the axis thereof relative to said arm member; lumbar pressing means fixedly mounted on said second rod member; a first control mechanism for forcing a unit of said arm member, said second rod member and said lumbar pressing means to swing about the axis of said first rod member when operated; and a second control mechanism for forcing a unit of said lumbar pressing means and said second rod member to swing the axis of said second rod member relative to said arm member when operated; said first control mechanism comprising; a first cam having a cam periphery operatively contacting said second rod member; a first axle member connected to said first cam to be rotatable therewith about the axis of said first axle member; and first stopping means for causing said axle member to assume a predetermined rest position under rotation thereof; said second control mechanism comprising: a second cam supported via a pivot by said arm member and having therein an elongated slot; a stud secured to said lumbar pressing means and movably received in said elongated slot of said second cam; second stopping means for causing said second cam to assure a predetermined rest position under the swingable rotation of it about said pivot; a second axle member; and a linkage operatively interposed between said second axle member and said second cam in such a manner that when said second axle member is rotated about the axis thereof, said second cam is swung about said pivot.
Claim 2
Dependent Claim
352 words
A seat with a backrest having spaced support portions by which a contourable portion constituted by padding means is supported, and an adjustable lumbar supporter for imparting a curvature to said contourable portion to produce a desired contour, said lumbar supporter comprising: a first rod member transversely crossing said support portions in a manner so as to be rotatable about the axis thereof relative to said support portions; an arm member secured at its one portion to said first rod member to be rotatable therewith; a second rod member held by said arm member in a manner so as to be rotatable about the axis thereof relative to said arm member; lumbar pressing means fixedly mounted on said second rod member; a first control mechanism for forcing a unit of said arm member, said second rod member and said lumbar pressing means to swing about the axis of said first rod member when operated; and a second control mechanism for forcing a unit of said lumbar pressing means and said second rod member to swing the axis of said second rod member relative to said arm member when operated; said first control mechanism comprising; a first cam having a cam periphery operatively contacting said second rod member; a first axle member connected to said first cam to be rotatable therewith about the axis of said first axle member; and first stopping means for causing said axle member to assume a predetermined rest position under rotation thereof; said second control mechanism comprising: a second cam supported via a pivot by said arm member and having therein an elongated slot; a stud secured to said lumbar pressing means and movably received in said elongated slot of said second cam; second stopping means for causing said second cam to assure a predetermined rest position under the swingable rotation of it about said pivot; a second axle member; and a linkage operatively interposed between said second axle member and said second cam in such a manner that when said second axle member is rotated about the axis thereof, said second cam is swung about said pivot.
Claim 3
Dependent Claim
33 words
A seat as claimed in claim 1, in which said second axle member of said second control mechanism is a sleeve through which said first axle member of said first control mechanism passes.
Claim 4
Dependent Claim
16 words
A seat as claimed in claim 1, in which said first cam is a snail cam.
Claim 5
Dependent Claim
61 words
A seat as claimed in claim 1, in which said first stopping means comprises: a circular plate concentrically and securely mounted on said first axle member and having at the periphery thereof a plurality of recesses; and a spring member having one end secured to a stationary member and the other end urgingly pressed on the periphery of said circular plate.
Claim 6
Dependent Claim
51 words
A seat as claimed in claim 1, in which said second stopping means comprises: a plurality of recesses formed in the periphery of said second cam; and a spring member having one end secured to said arm member and the other end urgingly pressed on the periphery of said second cam.
Claim 7
Dependent Claim
63 words
A seat as claimed in claim 1, in which said linkage comprises: a pin secured at its one end to said second cam; a link pivotally connected at its one end to the other end of said pin; a link lever having one end securely mounted on said second axle member and the other pivotally connected to the other end of said link.
Claim 8
Dependent Claim
29 words
A seat as claimed in claim 2, in which a unit of said first and second axle member is supported by one of said frame members via a bush.
Claim 9
Dependent Claim
39 words
A seat as claimed in claim 1, in which said lumbar pressing means comprises: two holders firmly mounted on said second rod member to be spaced from each other; and a plurality of springs spanned between said two holders.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |