US4023760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swivel chair
Assignee: Richards Wilcox Inc
•
Filing: 1975-12-22
•
Granted: 1977-05-17
•
Expires: 1995-12-22
Abstract
Abstract A swivel chair of the type embodying a support platform or pedestal with an upright and with jointed or articulated arms carried by the upright with the chair rotatably supported at the end of one of the arms. The chair can swivel or swing through 360° around the axis of the upright. If the floor on which the support platform rests is not level the axis of the upright is not vertical and the chair tends to swing by gravity to the lowermost position. The invention embodies an improvement to compensate for floor that is not level. The upright embodies a spindle and tilt ring having complementary inclined surfaces. By relative rotation of these elements the spindle can be brought into a vertical position and fixed at that position. The spindle is secured to a base member by a special nut having a convex surface cooperating with a complementary concave surface held within the base member.
Inventors
- 👤 Gerard A. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:20
CPC Classifications
A; A47; A47C; A47C9/00; A47C9/02; A47C9/022; A47C3/00; A47C3/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A movable chair comprising a base adapted for placing on a surface, upright means having an axis centrally carried by the base, jointed arm means carried by the upright means and a chair carried by the arm means, the arm means including first and second arms extending perpendicular to said upright means and pivoted together at a point spaced from said axis so that they are each movable in planes parallel to each other, the upright means including a spindle, the arm means being mounted to be rotatable about the spindle, and adjusting means providing a relationship between said spindle and the base means whereby relative rotation of the spindle changes its position whereby it may be adjusted to an exact vertical position, and means for holding said spindle in vertical position with respect to the base.
Claim 2
Dependent Claim
137 words
A movable chair comprising a base adapted for placing on a surface, upright means having an axis centrally carried by the base, jointed arm means carried by the upright means and a chair carried by the arm means, the arm means including first and second arms extending perpendicular to said upright means and pivoted together at a point spaced from said axis so that they are each movable in planes parallel to each other, the upright means including a spindle, the arm means being mounted to be rotatable about the spindle, and adjusting means providing a relationship between said spindle and the base means whereby relative rotation of the spindle changes its position whereby it may be adjusted to an exact vertical position, and means for holding said spindle in vertical position with respect to the base.
Claim 3
Dependent Claim
42 words
A chair as in claim 1, wherein the adjusting means includes juxtaposed surfaces, at least one of which is a slanting surface whereby upon relative rotation between the said surfaces the angle of the spindle with respect to vertical can be changed.
Claim 4
Dependent Claim
26 words
A chair as in claim 2, wherein said adjusting means includes a tilt ring having a slanting surface positioned between the spindle and the base means.
Claim 5
Dependent Claim
21 words
A chair as in claim 3, wherein said spindle and the tilt ring have complementary slanting surfaces juxtaposed against each other.
Claim 6
Dependent Claim
58 words
A chair as in claim 2, including a holding bolt extending through a bore in the spindle, a holding nut engageable with the end of the bolt of said holding bolt and said base means and holding nut having complementary surfaces permitting the spindle and holding bolt to be moved angularly with respect to the said base fitting.
Claim 7
Dependent Claim
33 words
A chair as in claim 5, wherein said base means includes a fitting having an opening in which is received the holding nut, one of said complementary surfaces being formed in said opening.
Claim 8
Dependent Claim
30 words
A chair as in claim 6, wherein said complementary surfaces include a convex surface formed on said holding nut which is engageable with the concave surface formed within said opening.
Claim 9
Dependent Claim
31 words
A chair as in claim 4, wherein the said spindle and tilt ring are provided with means to receive tools for manually rotating the spindle and tilt ring in opposite directions.
Claim 10
Dependent Claim
22 words
A chair as in claim 7, including a handle member on said holding nut to keep nut from turning when loosening bolt.
References Cited (Backward Citations)
US911893A
Cited
US2695147A
Cited
US2682131A
Cited
US3021638A
Cited
US3727873A
Cited
US3819136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |