Land vehicles – Wheeled – Occupant propelled type
Patent
1976-09-14
1978-03-14
Betts, Kenneth H.
Land vehicles
Wheeled
Occupant propelled type
B62K 2712
Patent
active
040788156
ABSTRACT:
A motorcycle sidecar frame composed of five elongate struts secured together at their respective ends into a shape substantially conforming to that of a tetrahedron. In one embodiment, a portion of an elongate frame member found on a motorcycle comprises the sixth edge of the tetrahedron. Two of the vertices of the tetrahedral frame are respectively located at two spaced points of the frame member. The remaining two vertices of the tetrahedron are respectively secured to a sidecar suspension system. One of the vertices is secured to the top of a shock absorber, which extends downwardly to the axle of the sidecar wheel, and the other vertex is pivotally secured to the end of an arm, the other end of which is secured to the sidecar wheel axle. In an alternative embodiment of the basic tetrahedral frame, the function of the five elongate struts of the first embodiment and the sixth strut is provided by the edges or corners of a tetrahedron formed by suitable sheets of metal. Other embodiments include frame members additional to the tetrahedral struts to strengthen the basic frame, to more securely locate the frame relative to the motorcycle and to facilitate the mounting of a sidecar body. The tetrahedral frame is releasably attached to the motorcycle by clevis and pin-type connectors which are suitable for connection to motorcycle frames of different dimensions, and include, or cooperate with, means for adjusting sidecar wheel toe-in.
REFERENCES:
patent: 1125743 (1915-01-01), Scott
patent: 1133444 (1915-03-01), Messier et al.
patent: 1236988 (1917-08-01), Scott
patent: 1417822 (1922-05-01), Grew
patent: 2797933 (1957-07-01), Aldous
patent: 3788670 (1974-01-01), Petersen
Betts Kenneth H.
Vetter Design Works, Inc.
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