Single sided cycle rear suspension system with vertical wheel mounting means

A single-sided rear suspension system for a cycle having a main frame, said suspension system comprising:

• a pivotable rear frame assembly including a primary swingarm pivotally connected at its front end on a first singular axis to the main frame, passing by one side of a rear wheel, said rear wheel having a rear wheel contact patch by which said rear wheel contacts the ground, said primary swingarm being pivotally connected on a second parallel axis at its rear end to a vertical junction member, said junction member having means for fitment of said rear wheel from said one side only, said swingarm junction member and wheel fitment menas pivoting to allow for up and down movement of said rear wheel relative to the main frame, said rear frame assembly also including a forwardly extending secondary swingarm having one end thereof pivotally connected to said junction member on a third parallel axis separated vertically in a location below said second axis, said secondary swingarm extending forward along said one side only of said rear wheel, and attaching by a fourth parallel axis to a pivot connection at the main frame, vertically separated below said first axis connection,
• a spring supported on one end of a portion of the frame and connected at the primary swingarm, said spring urging said pivotable rear frame assembly toward an unloaded position with respect to said frame;
• whereby lateral load to the rear wheel contact patch is resisted from torsionally or laterally deflecting the pivotable rear frame assembly with respect to the main frame by the rigidity of the four axes, which allow only rotation required to allow said rear wheel to move essentially vertically with respect to said frame for compliance over surface irregularities, said axes having no lateral freedom of motion.

A single-sided rear suspension system for a cycle having a main frame and a rear wheel, said suspension system comprising:

• a pivotable rear frame assembly including:
• a single primary swingarm pivotally connected at its front end on a first axis to the main frame, extending along one side only of said rear wheel,
• a junction member pivotally connected on a second axis to the rear end of said primary swingarm,
• said junction member having means for fitment of said rear wheel from said one side only,
• said swingarm junction member and wheel fitment means pivoting to allow for up and down movement of said rear wheel relative to the main frame, and
• a single secondary swingarm having one end pivotally connected to said junction member on a third substantially parallel axis spaced below said second axis, said secondary swingarm extending forward along said one side only of said rear wheel, and being attached by a fourth parallel axis to a pivot connection at the main frame, spaced below said first axis connection;
• and
• biasing means mounted at one end to a portion of the main frame and connected at the opposite end to said primary swingarm.