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US 4,378,857 AGranted
Motor-cycle frame
OwnerErland Anderssoninventor
Life of this patent
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OwnerErland Anderssoninventor
Estimating the term…
The main frame member of a motor-cycle mounts a steering head supporting the front fork, and at its rear end also a rear fork. Both forks are provided with shock absorbers and especially with motor-cycles suited for moto-cross running the movements of the forks in action may be considerable. The combined center of gravity of motorcycle and rider will change due to road and driving conditions, which means that the load upon the shock absorbers will change continuously. Undue compression or expansion of the front fork shock absorbers will alter the inclination of the front fork in relation to the plane of the ground, which makes steering difficult. To counteract such alterations the steering head includes a hoirzontal pivot and lever means connected to the rear fork for adjusting the position of the vertical axis of the steering head by causing a rotation of the head about the horizontal pivot in response to the swinging of the rear fork.
A motor-cycle having a frame including a main frame member with a front end and a rear end, means at said front end for mounting a steering head supporting a front fork rotatable about a substantially vertical pivot axis, a rear fork swingably supported at the rear end of said main frame member, and spring means at said front and said rear forks, said frame further including horizontal pivot means for carrying said steering head mounting means at the front end of said main frame, and movement transfer means connecting said rear fork with said horizontal pivot means.
Dependencies are inferred from the claim text.