Patent US4247376A successfully refreshed from Google Patents.
US3285657A
Expired / Lapsed
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Chair back adjusting mechanism
Assignee: Individual
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Filing: 1965-08-09
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Granted: 1966-11-15
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Expires: 1985-08-09
Abstract
No abstract record available.
Inventors
- 👤 Gaston Raoul H De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:45
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/443; A47C7/444
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
ADJUSTING MECHANISM FOR A CHAIR HAVING A SEAT AND A SEPARATE BACK, SAID MECHANISM COMPRISING: (A) A DRUM FIXEDLY SECURED TO THE SEAT AND TO A HORIZONTAL AXIS TRANSVERSE TO THE SEAT, (B) A BRACKET CARRYING THE CHAIR BACK AND FREELY PIVOTALLY MOUNTED ON SAID AXIS, (C) A COIL SPRING WOUND WITH ITS COIL IN FRICTION TIGHT ENGAGEMENT WITH THE CYLINDRICAL SURFACE ON THE DRUM, (D) ONE END OF SAID SPRING AFFIXED TO THE MENTIONED BRACKET ADJACENT TO THE SPRING COILS, AND (E) THE OPPOSITE END BEING EXTENDED FIRST REARWARDLY BENEATH THE CHAIR BACK AND THEN UPWARDLY AND REARWARDLY BEHIND THE CHAIR BACK, TO FORM A HANDLE THAT, WHEN FLEXED IN A REARWARD DIRECTION TO CAUSE ENLARGEMENT OF THE CONVOLUTION OF THE SPRING, CAUSES RELEASE OF THE FRICTION GRIP BETWEEN THE SPRING AND THE DRUM, THEREBY RELEASING THE BACK FOR ADJUSTMENT TO A DESIRED ANGLE ON THE MENTIONED AXIS.
Claim 2
Dependent Claim
149 words
ADJUSTING MECHANISM FOR A CHAIR HAVING A SEAT AND A SEPARATE BACK, SAID MECHANISM COMPRISING: (A) A DRUM FIXEDLY SECURED TO THE SEAT AND TO A HORIZONTAL AXIS TRANSVERSE TO THE SEAT, (B) A BRACKET CARRYING THE CHAIR BACK AND FREELY PIVOTALLY MOUNTED ON SAID AXIS, (C) A COIL SPRING WOUND WITH ITS COIL IN FRICTION TIGHT ENGAGEMENT WITH THE CYLINDRICAL SURFACE ON THE DRUM, (D) ONE END OF SAID SPRING AFFIXED TO THE MENTIONED BRACKET ADJACENT TO THE SPRING COILS, AND (E) THE OPPOSITE END BEING EXTENDED FIRST REARWARDLY BENEATH THE CHAIR BACK AND THEN UPWARDLY AND REARWARDLY BEHIND THE CHAIR BACK, TO FORM A HANDLE THAT, WHEN FLEXED IN A REARWARD DIRECTION TO CAUSE ENLARGEMENT OF THE CONVOLUTION OF THE SPRING, CAUSES RELEASE OF THE FRICTION GRIP BETWEEN THE SPRING AND THE DRUM, THEREBY RELEASING THE BACK FOR ADJUSTMENT TO A DESIRED ANGLE ON THE MENTIONED AXIS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |