US4405142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knock down wheel chair
Assignee: STAINLESS MEDICAL PRODUCTS A CORP OF CA
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Filing: 1981-03-09
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Granted: 1983-09-20
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Expires: 2001-03-09
Abstract
Abstract A knock down wheel chair that can be quickly disassembled and reassembled includes a pair of side frames connectable together by a front frame by means of quick release pins and by a back frame by means of quick release pins with a set of main wheels that are mounted to the respective side frames by means of quick release pins. The front frame assembly carries the front casters and is telescopically received in the side frames for adjusting the wheel base and is invertible to adjust the height of the frame with respective to the castors. The main wheels are detachably connectable to mounting plates on the side frames that are also adjustable for adjusting the width between the wheels and have means for adjusting the camber of the wheels as well as provide multiple different positions for height and center of gravity of the main wheels.
Inventors
- 👤 Donald L. Whetstine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/10; A61G5/1056; A61G5/1062; A61G5/1075; A61G5/1083; A61G5/1097; A61G5/12; A61G5/128; Y; Y10; Y10S; Y10S297/00; Y10S297/04; Y10S297/06
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
98 words
A quick breakdown wheel chair assembly comprising a pair of side frames, a front frame telescopically engaging said side frames for adjusting the length of the chair assembly including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, wherein said front frame has a generally A configuration with a forward foot bar and an intermediate leg support bar, and a pair of castors mounted at the ends of said leg support bar.
Claim 2
Dependent Claim
98 words
A quick breakdown wheel chair assembly comprising a pair of side frames, a front frame telescopically engaging said side frames for adjusting the length of the chair assembly including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, wherein said front frame has a generally A configuration with a forward foot bar and an intermediate leg support bar, and a pair of castors mounted at the ends of said leg support bar.
Claim 3
Dependent Claim
32 words
The wheel chair assembly of claim 1 wherein each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores.
Claim 4
Dependent Claim
47 words
The wheel chair assembly of claim 2 including a pair of main wheels, each of said main wheels rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket.
Claim 5
Dependent Claim
36 words
The wheel chair assembly of claim 3 wherein said axle includes a co-axial bore and releasing pin extending along said bore and engageable at the outer end thereof for releasing said axle from the mounting bore.
Claim 6
Dependent Claim
59 words
The wheel chair assembly of claim 1 wherein said side frames each comprise an upper and a lower tubular member connected together by a pair of vertical tubular members, said upper and lower tubular members extending generally parallel at the back end thereof between the connection of said vertical tubular members and converge together at the front end thereof.
Claim 7
Dependent Claim
19 words
The wheel chair assembly of claim 1 including a main wheel detachably secured to each of said side frames.
Claim 8
Dependent Claim
123 words
The wheel chair assembly of claim 1 wherein said side frames each comprise an upper and a lower tubular member connected together by a pair of vertical tubular members, said upper and lower tubular members extend generally parallel at the back end thereof between the connection of said vertical tubular members and converge together at the front end thereof, each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores, and a pair of main wheels, each of said main wheels rotatably mounted on an axle shaft, said shaft includes a quick release shack for extending into and releasably mounting in selected ones of said bores in said wheel bracket.
Claim 9
Dependent Claim
120 words
A quick breakdown wheel chair assembly comprising a pair of side frames, a front frame telescopically engaging said side frames for adjusting the length of the chair assembly including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, wherein said front frame has a generally A configuration with a forward foot bar and an intermediate leg support bar, and a pair of castors mounted at the ends of said leg support bar, and said front frame is invertible with respect to said side frames and said castors for adjusting the height of said frame.
Claim 10
Dependent Claim
120 words
A quick breakdown wheel chair assembly comprising a pair of side frames, a front frame telescopically engaging said side frames for adjusting the length of the chair assembly including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, wherein said front frame has a generally A configuration with a forward foot bar and an intermediate leg support bar, and a pair of castors mounted at the ends of said leg support bar, and said front frame is invertible with respect to said side frames and said castors for adjusting the height of said frame.
Claim 11
Dependent Claim
66 words
A quick breakdown wheel chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, said side frames each include a pair of C brackets for receiving said back frame.
Claim 12
Dependent Claim
66 words
A quick breakdown wheel chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, said side frames each include a pair of C brackets for receiving said back frame.
Claim 13
Dependent Claim
17 words
The wheel chair assembly of claim 9 wherein said quick release pins extend through said C brackets.
Claim 14
Dependent Claim
21 words
The wheel chair assemblly of claim 10 wherein said back frame is adjustable in height with respect to said side frames.
Claim 15
Dependent Claim
24 words
The wheel chair assembly of claim 9 wherein said front frame telescopically engages said side frames for adjusting the length of the frame assembly.
Claim 16
Dependent Claim
19 words
The wheel chair assembly of claim 12 wherein said front frame includes a caster mounted on each side thereof.
Claim 17
Dependent Claim
32 words
The wheel chair assembly of claim 9 wherein each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores.
Claim 18
Dependent Claim
47 words
The wheel chair assembly of claim 14 including a pair of main wheels, each of said main wheels rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket.
Claim 19
Dependent Claim
36 words
The wheel chair assembly of claim 15 wherein said axle includes a coaxial bore and releasing pin extending along said bore and engageable at the outer end thereof or releasing said axle from the mounting bore.
Claim 20
Dependent Claim
22 words
The wheel chair assembly of claim 15 wherein said wheel bracket includes adjusting means for selectively adjusting the camber of said wheel.
Claim 21
Dependent Claim
22 words
The wheel chair assembly of claim 15 wherein said wheel bracket is selectively reversible for selectively adjusting the width between said wheels.
Claim 22
Dependent Claim
128 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores, a pair of main wheels, each of said main wheel rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket, and said wheel bracket includes adjusting means for selectively adjusting the camber of said wheel.
Claim 23
Dependent Claim
128 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores, a pair of main wheels, each of said main wheel rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket, and said wheel bracket includes adjusting means for selectively adjusting the camber of said wheel.
Claim 24
Dependent Claim
128 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores, a pair of main wheels, each of said main wheels rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket, and said wheel bracket is selectively reversible for selectively adjusting the width between said wheels.
Claim 25
Dependent Claim
128 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores, a pair of main wheels, each of said main wheels rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket, and said wheel bracket is selectively reversible for selectively adjusting the width between said wheels.
Claim 26
Dependent Claim
133 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores, a pair of main wheels, each of said main wheels rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket, and said wheel bracket is reversible for selectively increasing the positions of adjustments of said frame relative to said wheels.
Claim 27
Dependent Claim
133 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, each of said side frames includes a wheel bracket for detachably mounting a wheel, said wheel bracket having a plurality of axle mounting bores, a pair of main wheels, each of said main wheels rotatably mounted on an axle shaft, said shaft includes a quick release shank for extending into and releasably mounting in selected ones of said bores in said wheel bracket, and said wheel bracket is reversible for selectively increasing the positions of adjustments of said frame relative to said wheels.
Claim 28
Dependent Claim
150 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, said side frames each comprise an upper and a lower tubular member connected toegther by a pair of vertical tubular members, said upper and lower tubular members extend generally parallel at the back end thereof between the connection of said vertical tubular members and converge together at the front end thereof, and seat means comprising a first generally rectangular panel of fabric material secured along opposite sides to said upper tubular member of said side frames, and a back rest including a top portion detachably securable to said back frame, and a bottom portion detachably securable to said first panel.
Claim 29
Dependent Claim
150 words
A quick breakdown chair assembly comprising a pair of side frames, a front frame including quick release pins for detachably connecting said side frames together at the front thereof and a back frame including quick release pin means for detachably connecting said side frames together at the back end thereof, said side frames each comprise an upper and a lower tubular member connected toegther by a pair of vertical tubular members, said upper and lower tubular members extend generally parallel at the back end thereof between the connection of said vertical tubular members and converge together at the front end thereof, and seat means comprising a first generally rectangular panel of fabric material secured along opposite sides to said upper tubular member of said side frames, and a back rest including a top portion detachably securable to said back frame, and a bottom portion detachably securable to said first panel.
Claim 30
Dependent Claim
36 words
The wheel chair assembly of claim 22 wherein said top portion of said back rest includes tubular pockets extending along opposite sides thereof for telescopically receiving a pair of upstanding tubular member of said back frame.
Claim 31
Dependent Claim
25 words
The wheel chair assembly of claim 22 wherein said bottom portion is detachably securable to said first panel by means of hook and loop fastening.
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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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |