US3736021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding wheel chair
Assignee: Andrews Maclaren Ltd
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Filing: 1971-04-16
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Granted: 1973-05-29
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Expires: 1991-04-16
Abstract
Abstract A folding wheeled chair or the like having bottom and back frame portions connected together at one end by a double-axis pivot joint and foldable brace members pivotably attached at the other ends of the frame portions. Each of the bottom and back frame portions are formed by interpivoted cross members and means are provided to lock the frames in an extended condition. Wheels are provided at the four corners of the bottom frame portion. The chair may be collapsed by pivoting the frame portions with respect to themselves and to each other while folding the brace members until a cane-like configuration is obtained.
Inventors
- 👤 O F Maclaren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:02
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/08; A61G5/0808; A61G5/0816; A61G5/0825; A61G5/085; A61G5/0883; B; B62; B62B; B62B2205/00; B62B2205/06; B62B2205/20; B62B2205/24; B62B7/00; B62B7/04; B62B7/06; B62B7/064; B62B9/00; B62B9/20; B62B9/206
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
278 words
A folding wheel chair having a frame structure comprising a bottom cross frame of interpivoted rigid members, a back cross frame of interpivoted rigid members, a double-axis pivot joint inter-pivotally attaching one of each of the bottom frame members to one of each of the back frame members at each of two corners of said cross frames, said axes being oriented to permit the members of each cross frame to pivot with respect to each other and to permit said cross frames to pivot with respect to each other, two foldable brace members pivotally attached to the bottom cross frame near the other two corners of the bottom cross frame, respectively, and to the back cross frame near the other two corners of the back cross frame, respectively, a leg element on each side of the frame structure, a first end of each leg element pivotally attached at one of said inter-pivotally attaching corners and the second end of each leg element pivotally attached to the foldable brace member on the same side of the frame structure as the leg whose end is attached thereto, two substantially parallel seat bars pivotally attached to the brace members on each side of the frame structure, one end of each seat bar slidably attached to the leg element on the same side of the frame structure as the seat bar attached thereto, first releasable means to hold the members of the back cross frame in an extended position when the assembly is unfolded, second releasable means to hold said brace members in an extended position when the assembly is unfolded, and wheels provided at each bottom corner of said frame structure.
Claim 2
Dependent Claim
278 words
A folding wheel chair having a frame structure comprising a bottom cross frame of interpivoted rigid members, a back cross frame of interpivoted rigid members, a double-axis pivot joint inter-pivotally attaching one of each of the bottom frame members to one of each of the back frame members at each of two corners of said cross frames, said axes being oriented to permit the members of each cross frame to pivot with respect to each other and to permit said cross frames to pivot with respect to each other, two foldable brace members pivotally attached to the bottom cross frame near the other two corners of the bottom cross frame, respectively, and to the back cross frame near the other two corners of the back cross frame, respectively, a leg element on each side of the frame structure, a first end of each leg element pivotally attached at one of said inter-pivotally attaching corners and the second end of each leg element pivotally attached to the foldable brace member on the same side of the frame structure as the leg whose end is attached thereto, two substantially parallel seat bars pivotally attached to the brace members on each side of the frame structure, one end of each seat bar slidably attached to the leg element on the same side of the frame structure as the seat bar attached thereto, first releasable means to hold the members of the back cross frame in an extended position when the assembly is unfolded, second releasable means to hold said brace members in an extended position when the assembly is unfolded, and wheels provided at each bottom corner of said frame structure.
Claim 3
Dependent Claim
17 words
A folding wheel chair according to claim 1, in which said first releasible means comprise toggle links.
Claim 4
Dependent Claim
34 words
A folding wheel chair according to claim 1, in which each said brace member comprises two pivotally interattached members and a spring lock to lock said pivotally interattached members in their aligned extended condition.
Claim 5
Dependent Claim
39 words
A folding wheel chair according to claim 1, in which one pair of said wheels are laterally disposed and freely castorable through 360*, the other pair of said wheels are laterally disposed and have a fixed direction of tracking.
Claim 6
Dependent Claim
20 words
A folding wheel chair according to claim 4, further comprising brake means for braking said pair of fixed tracking wheels.
Claim 7
Dependent Claim
54 words
A folding wheel chair according to claim 1, further comprising lever arms each having one end pivotally attached to the frame structure and said wheels mounted on a free end thereof, and elastomeric pads mounted on either side of said lever arms to check the vertical movement thereof and provide a shock absorbing action.
Claim 8
Dependent Claim
36 words
A folding wheel chair according to claim 10, further comprising two substantially parallel laterally-spaced seat-back bars pivotally attached at one end to said seat bars and slidably attached at the other end to said brace members.
Claim 9
Dependent Claim
21 words
A folding wheel chair according to claim 1 additionally comprising a seat of pliable material attached between said two seat bars.
Claim 10
Dependent Claim
20 words
A folding wheel chair according to claim 7 additionally comprising a seat-back of pliable material attached between said seat-back bars.
References Cited (Backward Citations)
GB681490A
Cited
FR1070000A
Cited
US2911245A
Cited
US3390893A
Cited
GB1154362A
Cited
US3485510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |