Bicycle frame with one or two improved wishbone stays

Details Bicycle frame with one or two improved wishbone stays Bicycle frame with one or two improved wishbone stays

1990-11-21

1992-07-14

Marmor, Charles A.

Land vehicles

Wheeled

Occupant propelled type

2802811, 280284, 280288, 188 2411, 188 2412, B62K 1938

Patent

active

051296659

ABSTRACT:
A bicycle frame with improved rigidity and strength is disclosed. The frame has a truss portion and upper and lower stays for connecting a rear wheel to the truss portion of the frame. One or both of the stays comprise a U-shaped tubular member having a curved portion and two leg portions, the leg portions positioned to straddle the rear wheel, and a second tubular member extending between the truss portion of the frame and the curved portion of the U-shaped tubular member. The second tubular member is shaped at one end so as to terminate in gussets that at least partially surround the curved portion of the U-shaped member. In preferred embodiments, the second tubular member is flattened at the end connecting to the U-shaped tubular member to have an elliptical cross-section with an inside minor axis dimension substantially equal to the outside diameter of the U-shaped tubular member, and the gussets terminate at about the centerline of the U-shaped tubular member. Also in the preferred embodiment, an annular tube spacer is placed inside the second tubular member so as to be concentric with mounting holes formed through the front and back walls of the flattened portion of the second tubular member. The mounting holes allows a brake assembly (on the upper stay) or a kickstand assembly (on the lower stay) to be bolted to the stay without fear of collapsing the tube walls.

REFERENCES:
patent: 614905 (1898-11-01), Sturges
patent: 660981 (1900-10-01), Barnes
patent: 747789 (1903-12-01), Somerby
patent: 1502890 (1924-07-01), Veasey
patent: 2353712 (1944-07-01), Dewey
patent: 4389055 (1983-06-01), Cockburn
patent: 4421337 (1983-12-01), Pratt
patent: 4511018 (1985-04-01), Scott
patent: 4705286 (1987-11-01), Lauzier et al.
patent: 4805742 (1989-02-01), Sato
patent: 4813591 (1989-03-01), Mueller et al.
patent: 4850607 (1989-07-01), Trimble
patent: 4902160 (1990-02-01), Jeng
patent: 4902458 (1990-02-01), Trimble
Roadmaster brochures, undated, for bicycle Models 2528, 2524, 2519V, 2521, 2522 and 2526.
Timberlin brochure, undated, noting a "Tange MTB Double Butted Cro-moly Mono-stay frame."
Schwinn brochure, undated, including pp. 5, 15 and 22, captioned "Aluminum Frames, A Breed Apart".
Raleigh brochure, undated, pp. 20 and 21, titled "Technium Mountain Bikes Reach a New Summit."

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