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US 7,681,679 B2Granted
Cantilevered motorcycle frame
OwnerScott Plourdeinventor
Life of this patent
Estimating the term…
Abstract
A motorcycle frame assembly having a cantilevered, open loop motorcycle frame assembly that achieves a desirable balance between frame strength and rigidity in a lateral and a vertical direction without the necessity of a conventional down tube. The frame assembly utilizes a top tube supported by a top tube support aligned parallel and concentric with at least a portion of the top tube from a connection point with the head tube. The top tube and support being the sole support for the head tube so that a down tube is not necessary.
Claims15
A motorcycle frame comprising:
- a head tube for pivotally supporting a front wheel, fork and steering assembly;
- a contiguous top tube having a forward portion extending rearward from the head tube to a rearward portion of the top tube which curves downwardly and rearwardly to define a seat position for a rider;
- and
- a support member connected to the head tube and the forward portion of the top tube;
- and
- the support member is connected in a parallel and concentric relationship with at least the forward portion of the top tube;
- and
- wherein the top tube extends rearwardly and upwardly along a central plane of the motorcycle frame from a connection with the head tube to a highest crown point of the frame before curving downwardly and rearwardly to define the seat position for the rider.
5 more elements
A motorcycle frame comprising:
- a head tube;
- a top tube;
- a top tube support arranged parallel with the top tube;
- a lower frame section;
- the sole support of the head tube is provided by the top tube and top tube support;
- and
- wherein the top tube and top tube support comprise an upward and rearward arc from a connection point with the head tube.
4 more elements
Dependencies are inferred from the claim text.