Land vehicles – Wheeled – Occupant propelled type
Reexamination Certificate
1999-05-04
2001-11-20
Johnson, Brian L. (Department: 3618)
Land vehicles
Wheeled
Occupant propelled type
C280S274000
Reexamination Certificate
active
06318744
ABSTRACT:
BACKGROUND AND PRIOR ART
This invention pertains to improving the rideability of road bicycles by improving prevailing dominant art. Specifically relegating Diamond 473,829 to history. This indomitable unduly harsh rear frame art has dominated since conception due to the unsurpassed efficiency in the snapback resilience inherent in triangulated light steel stays. The world was young and had fallen in love with bicycles, so it was embraced unconditionally and hears little criticism today. But despite longevity, Diamond art was not fully embraced, as the triangulated rear frame section leaves the seat stays in a direct line of shock from the axle to the base of the spine, via the seatpost. Uncomfortable? Yes. And stays behind the seat tube add little to the rigidity needed to stave off flex induced leg cramps. Collins 544,427 shows a bicycle with Diamond art that is identical to contemporary art. Nothing has changed in over a century, the same strengths and weaknesses are still intrinsic. The dilemma one is confronted with in improving bicycle art is solving the improbable mix of resilience and rigidity: resilience for comfort and rigidity at the cranks for efficiency. Opposites in the same light weight frame that have to be melded without cancelling each other out.
There has always been need for improvement in Diamond art. The demand for light weight bicycles resulted in a frame too flexible to maintain wheel alignment. Two long thin tubes, the top and down tube are insufficient to maintain head tube rigidity, inducing fork flex that prescribes slow, vague, inaccurate steering. Yet, despite these flaws, this art became derigueur and, as decades passed, attempts to displace it were futile.
SUMMARY OF INVENTION
Diamond was displaced by altering the final act of the frame building process, the attachment of the seat stays. Modified, by directing extra long seat stays diagonally forward clear of the seat tube to the upper slope of the down tube and brazing the junction at 2½ inches past center. This places the bottom bracket in a four sided (boxed) triangulated structure of immense strength, bringing about, a metamorphosis in bicycles. The sum being greater than the whole.
The ride brings to mind: “The Missing Link.” as one mulls how it took so long to find . . . “It flat works!”
REFERENCES:
patent: 473829 (1892-04-01), Diamond
patent: 526265 (1894-09-01), De Rossetti
patent: 527404 (1894-10-01), Byrne
patent: 544427 (1895-08-01), Collins et al.
patent: 578269 (1897-03-01), Savorgnan
patent: 625835 (1899-05-01), Davis
patent: 2244709 (1941-06-01), Kinzel
patent: 4577879 (1986-03-01), Vereyken
patent: 5211415 (1993-05-01), Gasiorowski
patent: 5240268 (1993-08-01), Allsop et al.
patent: 5284354 (1994-02-01), McWethy
patent: 5509678 (1996-04-01), Ullman et al.
patent: 5685553 (1997-11-01), Wilcox et al.
patent: 6012733 (2000-01-01), Rafoth
Aero-comp brochure.
Schwinn bicycle brochure.
Draper Deanna
Johnson Brian L.
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