US4148523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding adjustable work stool
Assignee: BEGEMANN KARLHEINZ
•
Filing: 1977-04-27
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Granted: 1979-04-10
•
Expires: 1997-04-27
Abstract
Abstract The invention relates to a work stool used for a higher than normal seating position as required when working at a drafting table or the like. Features of the invention include a light weight frame that folds for storage, a wide base that does not interfere with the user's feet, and a vertically adjustable seat having a textured surface for ventilation.
Inventors
- 👤 Peter Brand
- 👤 Guenther Haefner
- 👤 Fritz Diedrich
- 👤 Hans Kirchmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:59
CPC Classifications
A; A47; A47C; A47C5/00; A47C5/04; A47C5/10; A47C3/00; A47C3/20; A47C3/28; A47C4/00; A47C4/04; A47C4/18; A47C9/00; A47C9/02; A47C9/025
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
231 words
A collapsible stool for resting on a floor having a closed frame and a seat vertically adjustably mounted on said frame, said frame includes a rearwardly slanting pair of first parallel supporting members rigidly connected to each other to form a closed frame for supporting a seat projecting forwardly from said pair of first supporting members at a first acute angle, said pair of first supporting members is supported relative to the floor by a brace extending downward and backward within a second acute angle from a rear side of said first supporting members, said brace comprises a pair of rigidly connected diverging brace members, said pair of brace members pivotally connected to said pair of first supporting members by means of a pair of hinges and being connected to each other at their bottom by a second cross-piece so that the brace is shaped as a trapezoid having an open top side parallel to and shorter than said second cross-piece, said closed frame formed by said first supporting members being of symmetric trapezoidal shape at its lower end and having a first cross-piece resting on the floor forming the base of the trapezoidal shape, said first cross-piece being longer than the distance between said parallel first supporting members, a pair of divergent slanting members connect said first cross-piece to said pair of first supporting members, thereby completing said closed frame.
Claim 2
Dependent Claim
231 words
A collapsible stool for resting on a floor having a closed frame and a seat vertically adjustably mounted on said frame, said frame includes a rearwardly slanting pair of first parallel supporting members rigidly connected to each other to form a closed frame for supporting a seat projecting forwardly from said pair of first supporting members at a first acute angle, said pair of first supporting members is supported relative to the floor by a brace extending downward and backward within a second acute angle from a rear side of said first supporting members, said brace comprises a pair of rigidly connected diverging brace members, said pair of brace members pivotally connected to said pair of first supporting members by means of a pair of hinges and being connected to each other at their bottom by a second cross-piece so that the brace is shaped as a trapezoid having an open top side parallel to and shorter than said second cross-piece, said closed frame formed by said first supporting members being of symmetric trapezoidal shape at its lower end and having a first cross-piece resting on the floor forming the base of the trapezoidal shape, said first cross-piece being longer than the distance between said parallel first supporting members, a pair of divergent slanting members connect said first cross-piece to said pair of first supporting members, thereby completing said closed frame.
Claim 3
Dependent Claim
17 words
A stool according to claim 1, wherein said brace and said frame are composed of tubular members.
Claim 4
Dependent Claim
26 words
A stool according to claim 1, wherein said first members extend throughout an adjusting range and in that said seat is vertically adjustable over said range.
Claim 5
Dependent Claim
23 words
A stool according to claim 3, wherein said seat is pivotably mounted so that said seat can be folded up against said frame.
Claim 6
Dependent Claim
114 words
A stool according to claim 1, wherein said hinges between said brace members and said first members are each formed from two gripping members having first and second ends and connected by fastening means, which first ends of said gripping members grip said first members, and between which second ends of said gripping members said brace members pivot about said fastening means, and said fastening means pass through holes located a predetermined distance from an end of said brace member, so that said ends of said brace members press against said first members when said brace is in said predetermined position during use, whereby said ends of said brace members form said stopping means.
Claim 7
Dependent Claim
43 words
A stool according to claim 5, wherein at least one of said gripping members is partially formed into a plurality of flanges projecting toward the other one of said gripping member, whereby said first member is gripped by said plurality of projecting flanges.
Claim 8
Dependent Claim
35 words
A stool according to claim 6, wherein one of said projecting flanges presses against said brace member when said brace is in said predetermined position, whereby said projecting flange forms a stop for said brace.
Claim 9
Dependent Claim
16 words
A stool according to claim 6, wherein said gripping members are mirror images of one another.
Claim 10
Dependent Claim
25 words
A stool according to claim 8, wherein said second ends of said gripping members include projecting flanges of semicircular outline, centered on said fastening means.
Claim 11
Dependent Claim
23 words
A stool according to claim 6, wherein said first ends of said gripping members are shaped to fit snugly about said first members.
Claim 12
Dependent Claim
18 words
A stool according to claim 1, wherein said seat comprises a contoured hollow seat body formed of plastic.
Claim 13
Dependent Claim
35 words
A stool according to claim 11, wherein said seat body has a surface pattern of nubs, between which nubs runs an array of shallow grooves open to at least one side of said seat body.
Claim 14
Dependent Claim
13 words
A stool according to claim 12, wherein said nubs are smoothly rounded off.
Claim 15
Dependent Claim
18 words
A stool according to claim 13, wherein said seat body is perforated by a plurality of ventilation holes.
Claim 16
Dependent Claim
119 words
A stool according to claim 1, further characterized in that said hinges between said brace members and said first members are each formed from two gripping members having first and second ends and connected by fastening means, which first ends of said gripping members grip said first members, and between which second ends of said gripping members said brace members pivot about said fastening means, and in that said fastening means pass through holes located a predetermined distance from an end of said brace member, so that said ends of said brace members press against said first members when said brace is in said predetermined position during use, whereby said ends of said brace members form said stopping means.
Claim 17
Dependent Claim
46 words
A stool according to claim 15, further characterized in that at least one of said gripping members is partially formed into a plurality of flanges projecting toward the other one of said gripping members, whereby said first member is gripped by said plurality of projecting flanges.
Claim 18
Dependent Claim
38 words
A stool according to claim 16, further characterized in that one of said projecting flanges presses against said brace member when said brace is in said predetermined position, whereby said projecting flange forms a stop for said brace.
Claim 19
Dependent Claim
19 words
A stool according to claim 16, further characterized in that said gripping members are mirror images of one another.
Claim 20
Dependent Claim
28 words
A stool according to claim 18, further characterized in that said second ends of said gripping members include projecting flanges of semi-circular outline, centered on said fastening means.
Claim 21
Dependent Claim
26 words
A stool according to claim 16, further characterized in that said first ends of said gripping members are shaped to fit snugly about the first members.
Claim 22
Dependent Claim
22 words
A stool according to claim 1, further characterized in that said seat comprises a contoured hollow seat body formed of durable plastic.
Claim 23
Dependent Claim
38 words
A stool according to claim 21, further characterized in that said seat body has a surface pattern of nubs, between which nubs runs an array of shallow grooves open to at least one side of said seat body.
Claim 24
Dependent Claim
16 words
A stool according to claim 22, further characterized in that said nubs are smoothly rounded off.
Claim 25
Dependent Claim
21 words
A stool according to claim 23, further characterized in that said seat body is perforated by a plurality of ventilation holes.
Claim 26
Dependent Claim
22 words
A stool according to claim 16, further characterized in that said seat comprises a contoured hollow seat body formed of durable plastic.
Claim 27
Dependent Claim
38 words
A stool according to claim 25, further characterized in that said seat body has a surface pattern of nubs, between which nubs runs an array of shallow grooves open to at least one side of said seat body.
Claim 28
Dependent Claim
16 words
A stool according to claim 26, further characterized in that said nubs are smoothly rounded off.
Claim 29
Dependent Claim
21 words
A stool according to claim 27, further characterized in that said seat body is perforated by a plurality of ventilation holes.
Claim 30
Dependent Claim
119 words
A stool according to claim 2, further characterized in that said hinges between said brace members and said first members are each formed from two gripping members having first and second ends and connected by fastening means, which first ends of said gripping members grip said first members, and between which second ends of said gripping members said brace members pivot about said fastening means, and in that said fastening means pass through holes located a predetermined distance from an end of said brace member, so that said ends of said brace members press against said first members when said brace is in said predetermined position during use, whereby said ends of said brace members form said stopping means.
Claim 31
Dependent Claim
46 words
A stool according to claim 29, further characterized in that at least one of said gripping members is partially formed into a plurality of flanges projecting toward the other one of said gripping members, whereby said first member is gripped by said plurality of projecting flanges.
Claim 32
Dependent Claim
38 words
A stool according to claim 30, further characterized in that one of said projecting flanges presses against said brace member when said brace is in said predetermined position, whereby said projecting flange forms a stop for said brace.
Claim 33
Dependent Claim
19 words
A stool according to claim 30, further characterized in that said gripping members are mirror images of one another.
Claim 34
Dependent Claim
28 words
A stool according to claim 32, further characterized in that said second ends of said gripping members include projecting flanges of semi-circular outline, centered on said fastening means.
Claim 35
Dependent Claim
27 words
A stool in accordance with claim 30, further characterized in that said first ends of said gripping members are shaped to fit snugly about said first members.
Claim 36
Dependent Claim
21 words
A stool according to claim 34, further characterized in that said seat comprises a contoured hollow seat body formed of plastic.
Claim 37
Dependent Claim
38 words
A stool according to claim 35, further characterized in that said seat body has a surface pattern of nubs, between which nubs runs an array of shallow grooves open to at least one side of said seat body.
Claim 38
Dependent Claim
16 words
A stool according to claim 36, further characterized in that said nubs are smoothly rounded off.
Claim 39
Dependent Claim
21 words
A stool according to claim 37, further characterized in that said seat body is perforated by a plurality of ventilation holes.
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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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |