Heavy duty dirt bicycle and frame therefor

Details Heavy duty dirt bicycle and frame therefor Heavy duty dirt bicycle and frame therefor

1976-02-25

1977-09-06

Goodman, Philip

Land vehicles

Wheeled

Occupant propelled type

280259, 280279, 280284, B60K 2504

Patent

active

040463966

ABSTRACT:
A heavy duty off-pavement or dirt bicycle and frame therefor, includes a rear wheel frame portion having a metal alloy, tubular main frame member formed into a broad V-shape, a lower arcuate portion thereof being normally, in use, the lowest part of the frame. A tubular crank hub, having an axis orthogonal to the plane of the main frame member, is welded to an inner, forward side of such member, upwardly from the bottom thereof, so that the hub is within the confines of the main frame member and is protected thereby from damaging contact with large rocks, curbs, etc. The continuous nature of the main frame member greatly increases the strength of the rear frame portion over similar, sectioned frames. A socket joined to the upper forward end of the main frame member, pivotally mounts a front wheel fork assembly. Each of two elongate, tubular front wheel mounting members of the front fork assembly has disposed therewithin a longitudinally formed, elongate angle, resulting in greatly increased resistance of the members to bending or breaking in use. A rear wheel fork assembly is pivotally mounted, at a forward end, to the main frame member at the hub, and at an upper region to a shock absorber whose forward end is pivotally mounted to the main frame member rearwardly of the front fork assembly mounting socket. Two variations of the rear wheel frame portion are also illustrated and described.

REFERENCES:
patent: 478391 (1892-07-01), Bolte
patent: 604724 (1898-05-01), Case
patent: 1947631 (1934-02-01), Whidden
patent: 3931990 (1976-01-01), Knapp

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