Patent ID: 8292315

Claim:
A vehicle comprising: a front frame section; a seat for a rider carried on said front frame section; a front wheel rotatably journaled on said front frame section at a front axle axis at a distance ahead of the seat; a rear frame section; a pair of rear wheels spaced transversely from one another and rotatably journaled on the rear frame section adjacent opposite sides thereof at a rear axle axis at a distance behind the front axle axis; a flexible joint between the front and rear frame sections at a location disposed ahead of the seat and the rear axle axis and behind the front axle axis, the flexible joint enabling relative pivoting of the frame sections about a tiltable axis of said flexible joint; and a pair of link arms connected between the front and rear frames at a distance behind the flexible joint, each link arm inclining from a first connection to the rear frame adjacent a first side thereof to a second connection to the front frame, each connection of each link arm enabling pivoting thereof about three orthogonal axes; wherein a dynamic articulation axis intersects the flexible connection and an imaginary axis extending through the second connections of the link arms to the front frame, the front frame being tiltable relative to the rear frame to shift the dynamic axis relative to either side from a default position positioning the front wheel in a straight orientation relative to the rear wheels.