Patent US3870271A successfully refreshed from Google Patents.
US3870271A
Expired / Lapsed
US
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Fully enclosed, adjustable, support column for a pivotal chair
Assignee: Harter Corp
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Filing: 1973-10-31
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Granted: 1975-03-11
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Expires: 1993-10-31
Abstract
Abstract A support column for a pivotal chair. The support column may be fully enclosed and yet permit selective adjustability in the height of the seat section above a base portion merely by rotation of the seat section. A threaded spindle is non-rotatably secured to, and extends downwardly from, the seat section to be received within a hub tube that extends upwardly from the base portion. An adjusting nut is threaded onto the spindle to control the axial extent to which the spindle is received within the hub tube and thereby regulate the height of the seat section above the base portion. A contact means presented from the adjusting nut engages a stop presented from the hub tube so that rotation of the seat section when the chair is not occupied effects relative rotation of the spindle with respect to the adjusting nut, thereby adjusting the height of the seat section. When the chair is occupied, however, the contact means will not engage the stop, and the seat section may be rotated without effecting any adjustment in the height thereof.
Inventors
- 👤 Gary L Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:40
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
216 words
An adjustable support column for pivotally mounting the seat section of a chair to a base portion comprising; a hub tube extending upwardly from the base portion, a threaded spindle extending downwardly from the seat section, at least a portion of said spindle being rotatably and reciprocatingly received within said hub tube, an adjusting nut assembly threaded onto said spindle, a resilient means interposed axially between said adjusting nut assembly and said hub tube such that contact of the adjusting nut assembly with the hub tube through said resilient means establishes the extent to which said spindle can extend within said hub tube and thereby control the height of the seat section, stop means presented radially from said hub tube, contact means presented from said adjusting nut assembly and extending axially past said resilient means to engage said stop means and permit relative rotation of said adjusting nut assembly with respect to said spindle in the absence of weight being supported on said spindle, said resilient means being compressed between said adjusting nut assembly and said hub tube in response to weight being supported on said spindle to displace said contact means with respect to said stop means and permit free rotation of the threaded spindle and adjusting nut assembly with respect to said hub tube.
Claim 2
Dependent Claim
216 words
An adjustable support column for pivotally mounting the seat section of a chair to a base portion comprising; a hub tube extending upwardly from the base portion, a threaded spindle extending downwardly from the seat section, at least a portion of said spindle being rotatably and reciprocatingly received within said hub tube, an adjusting nut assembly threaded onto said spindle, a resilient means interposed axially between said adjusting nut assembly and said hub tube such that contact of the adjusting nut assembly with the hub tube through said resilient means establishes the extent to which said spindle can extend within said hub tube and thereby control the height of the seat section, stop means presented radially from said hub tube, contact means presented from said adjusting nut assembly and extending axially past said resilient means to engage said stop means and permit relative rotation of said adjusting nut assembly with respect to said spindle in the absence of weight being supported on said spindle, said resilient means being compressed between said adjusting nut assembly and said hub tube in response to weight being supported on said spindle to displace said contact means with respect to said stop means and permit free rotation of the threaded spindle and adjusting nut assembly with respect to said hub tube.
Claim 3
Dependent Claim
216 words
An adjustable support column for pivotally mounting the seat section of a chair to a base portion comprising; a hub tube extending upwardly from the base portion, a threaded spindle extending downwardly from the seat section, at least a portion of said spindle being rotatably and reciprocatingly received within said hub tube, an adjusting nut assembly threaded onto said spindle, a resilient means interposed axially between said adjusting nut assembly and said hub tube such that contact of the adjusting nut assembly with the hub tube through said resilient means establishes the extent to which said spindle can extend within said hub tube and thereby control the height of the seat section, stop means presented radially from said hub tube, contact means presented from said adjusting nut assembly and extending axially past said resilient means to engage said stop means and permit relative rotation of said adjusting nut assembly with respect to said spindle in the absence of weight being supported on said spindle, said resilient means being compressed between said adjusting nut assembly and said hub tube in response to weight being supported on said spindle to displace said contact means with respect to said stop means and permit free rotation of the threaded spindle and adjusting nut assembly with respect to said hub tube.
Claim 4
Dependent Claim
216 words
An adjustable support column for pivotally mounting the seat section of a chair to a base portion comprising; a hub tube extending upwardly from the base portion, a threaded spindle extending downwardly from the seat section, at least a portion of said spindle being rotatably and reciprocatingly received within said hub tube, an adjusting nut assembly threaded onto said spindle, a resilient means interposed axially between said adjusting nut assembly and said hub tube such that contact of the adjusting nut assembly with the hub tube through said resilient means establishes the extent to which said spindle can extend within said hub tube and thereby control the height of the seat section, stop means presented radially from said hub tube, contact means presented from said adjusting nut assembly and extending axially past said resilient means to engage said stop means and permit relative rotation of said adjusting nut assembly with respect to said spindle in the absence of weight being supported on said spindle, said resilient means being compressed between said adjusting nut assembly and said hub tube in response to weight being supported on said spindle to displace said contact means with respect to said stop means and permit free rotation of the threaded spindle and adjusting nut assembly with respect to said hub tube.
Claim 5
Dependent Claim
53 words
An adjustable support column, as set forth in claim 1, in which a first cover tube surrounds said hub tube and extends upwardly from the base portion, and in which a second cover tube surrounds said spindle and extends downwardly From the seat section, said first and second cover tubes being telescopically interfitted.
Claim 6
Dependent Claim
176 words
A chair having an adjustable support column comprising; a seat section, a base portion, a hub tube secured to and extending upwardly from said base portion, a rim presented from the upper extremity of said hub tube, a threaded spindle extending downwardly of the seat section to be received within said hub tube, means non-rotatably to connect said spindle to the seat section, an adjusting nut threaded onto said spindle and extending radially thereof in opposition to said rim in order to establish the extent to which said spindle may extend into said hub tube and thereby control the height of said seat section above said base portion, a stop presented from said hub tube, contact means presented from said adjusting nut selectively to engage said stop and permit relative rotation of the spindle with respect to said nut for adjusting the height of said seat section, and resilient means interposed between said adjusting nut and said hub tube whereby said contact means moves out of engagement with said stop when said seat section is occupied.
Claim 7
Dependent Claim
176 words
A chair having an adjustable support column comprising; a seat section, a base portion, a hub tube secured to and extending upwardly from said base portion, a rim presented from the upper extremity of said hub tube, a threaded spindle extending downwardly of the seat section to be received within said hub tube, means non-rotatably to connect said spindle to the seat section, an adjusting nut threaded onto said spindle and extending radially thereof in opposition to said rim in order to establish the extent to which said spindle may extend into said hub tube and thereby control the height of said seat section above said base portion, a stop presented from said hub tube, contact means presented from said adjusting nut selectively to engage said stop and permit relative rotation of the spindle with respect to said nut for adjusting the height of said seat section, and resilient means interposed between said adjusting nut and said hub tube whereby said contact means moves out of engagement with said stop when said seat section is occupied.
Claim 8
Dependent Claim
51 words
A chair, as set forth in claim 3, in which a first cover tube surrounds said hub tube and extends upwardly from said base portion, and in which a second cover tube surrounds said spindle and extends downwardly from said seat section, said first and second cover tubes being telescopically interfitted.
Claim 9
Dependent Claim
35 words
A chair, as set forth in claim 4, in which the contact means comprises a finger presented from an arm means secured to said adjusting nut, and said stop extends outwardly of said hub tube.
Claim 10
Dependent Claim
46 words
A chair, as set forth in claim 4, in which a J-washer is non-rotatably mounted from said spindle, said J-washer being located in juxtaposition with said adjusting nut, first means on said J-washer interacting with second means on said adjusting nut to retard relative rotation therebetween.
Claim 11
Dependent Claim
27 words
A chair, as set forth in claim 4, in which said resilient means comprises a plurality of disc washers stacked alternately with one or more spring washers.
Claim 12
Dependent Claim
18 words
A chair, as set forth in claim 4, in which said resilient means comprises a coiled compression spring.
Claim 13
Dependent Claim
39 words
A chair, as set forth in claim 8, in which a first J-washer is interposed between said coiled compression spring and said adjusting nut and a second J-washer is interposed between said coiled compression spring and said hub tube.
Claim 14
Dependent Claim
31 words
A chair, as set forth in claim 6, in which said contact means comprises a screw threaded through, and extending radially inwardly of, an arm means secured to said adjusting nut.
Claim 15
Dependent Claim
46 words
A chair, as set forth in claim 10, in which an annular flange means is attached to, and extends outwardly of, said hub tube, said flange means being positioned upwardly of said contact means to preclude inadvertent separation of the seat section from said base portion.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |