US4427209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bicycle frame
Assignee: Individual
•
Filing: 1982-02-16
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Granted: 1984-01-24
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Expires: 2002-02-16
Abstract
Abstract A bicycle frame for bicycles designed for structural strength and for positioning of a chain sprocket above the lowermost portion of the frame. The frame is constructed with a looped tube assembly with a front tube loop connected to a head tube and wheel fork assembly forming a quadrilateral structure of generally triangular shape, and a pair of rear tube loops forming a pair of parallel quadrilateral structures of generally diamond shape, with the front tube loop and rear tube loops being mutually interconnected on a sprocket shell. The looped tube assembly has seat and chain stay bracing, and brackets for mounting a rear wheel between the pair of rear tube loops.
Inventors
- 👤 Norimasa Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:53
CPC Classifications
B; B62; B62K; B62K3/00; B62K19/00; B62K19/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
159 words
A bicycle frame comprising a looped tube assembly having a front tube loop, a pair of spaced, parallel rear tube loops, and an interconnection means for interconnecting said front tube loop and said pair of rear tube loops, wherein said front tube loop has connected thereto a conventional head tube and front fork assembly, said front tube loop with said head tube forming a substantially quadrilateral structure with upper and lower rearward bends; each of said rear tube loops form substantially quadrilateral structures of generally diamond shape with top and bottom, and front and rear bends; and, wherein said means for interconnecting said front tube loop and said pair or rear tube loops comprises an interconnecting structural device which engages the inside of the upper rearward bend of said front tube loop and the inside of the front bends of said tube loops which are arranged on each side of said upper rearward bend of said front tube loop.
Claim 2
Dependent Claim
159 words
A bicycle frame comprising a looped tube assembly having a front tube loop, a pair of spaced, parallel rear tube loops, and an interconnection means for interconnecting said front tube loop and said pair of rear tube loops, wherein said front tube loop has connected thereto a conventional head tube and front fork assembly, said front tube loop with said head tube forming a substantially quadrilateral structure with upper and lower rearward bends; each of said rear tube loops form substantially quadrilateral structures of generally diamond shape with top and bottom, and front and rear bends; and, wherein said means for interconnecting said front tube loop and said pair or rear tube loops comprises an interconnecting structural device which engages the inside of the upper rearward bend of said front tube loop and the inside of the front bends of said tube loops which are arranged on each side of said upper rearward bend of said front tube loop.
Claim 3
Dependent Claim
49 words
The bicycle frame of claim 1 comprising further structural bracing between an upper portion of said rear tube loops and an upper portion of said front tube loop and structural bracing between a lower portion of said rear tube loops and a lower portion of said front tube loop.
Claim 4
Dependent Claim
77 words
The bicycle frame of claim 2 wherein said bracing comprises a first pair of rigid structural stays having first ends connected to the top bends of said rear tube loops and second ends connected to the upper portion of said front tube loop, and a second pair of rigid structural stays having first ends connected to the bottom bends of said rear tube loops and second ends connected to the lower portion of said front tube loop.
Claim 5
Dependent Claim
44 words
The bicycle frame of claim 2 wherein said interconnecting structural device comprises a journal shell, said journal shell having a sprocket assembly with connected sprocket and pedals, wherein said journal location maintains at least said sprocket above the lowermost portion of said frame assembly.
Claim 6
Dependent Claim
26 words
The bicycle frame of claim 4 wherein said journal shell location maintains both said sprocket and said pedals above the lowermost portion of said frame assembly.
Claim 7
Dependent Claim
29 words
The bicycle frame of claim 5 wherein said pair of said rear tube loops have mounted to each rear bends a drop-out bracket for mounting of a rear wheel.
Claim 8
Dependent Claim
36 words
The bicycle frame of claim 5 wherein a portion of one of said rear tube loops adjacent said sprocket is deformed to permit a sprocket chain free passage to a rear wheel mounted to said frame.
Claim 9
Dependent Claim
28 words
The bicycle frame assembly of claim 7 comprising further a seat post bracket and frame brace joined between the top bends of said pair of rear tube loops.
Claim 10
Dependent Claim
53 words
The bicycle frame of claim 2 wherein said interconnecting structural device includes means for interconnecting with limited articulation said front tube loop and said pair of rear tube loops, and wherein said bracing comprises shock absorber means for allowing restricted articulation of said front tube loop and said pair of rear tube loops.
Claim 11
Dependent Claim
72 words
A bicycle frame comprising a looped tube assembly having a front tube loop, a pair of spaced, parallel rear tube loops, and an interconnection means for interconnecting said front tube loop and said pair of rear tube loops wherein said interconnecting means comprises a journal shell with a sprocket and pedals, said journal shell engaging the inside of said front tube loop and the inside of said pair of rear tube loops.
Claim 12
Dependent Claim
72 words
A bicycle frame comprising a looped tube assembly having a front tube loop, a pair of spaced, parallel rear tube loops, and an interconnection means for interconnecting said front tube loop and said pair of rear tube loops wherein said interconnecting means comprises a journal shell with a sprocket and pedals, said journal shell engaging the inside of said front tube loop and the inside of said pair of rear tube loops.
Claim 13
Dependent Claim
49 words
The bicycle frame of claim 10 comprising further structural bracing between an upper portion of said rear tube loops and an upper portion of said front tube loop and structural bracing between a lower portion of said rear tube loops and a lower portion of said front tube loop.
Claim 14
Dependent Claim
77 words
The bicycle frame of claim 11 wherein said bracing comprises a first pair of rigid structural stays having first ends connected to the upper portion of said rear tube loops and second ends connected to the upper portion of said front tube loop and a second pair of rigid structural stays having first ends connected to the lower portion of said rear tube loops and second ends connected to the lower portion of said front tube loop.
Claim 15
Dependent Claim
42 words
The bicycle frame of claim 12 wherein said journal shell includes means for interconnecting said loops with limited articulation and said bracing comprises shock absorber means for allowing restricted articulation of said front tube loop and said pair of rear tube loops.
References Cited (Backward Citations)
US519855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |