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1. WO2020107055 - BICYCLE LINKAGE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims:

1. A bicycle having an instant centre and including separate front and rear frames, the front frame supported by a front wheel and a rear frame supported by a rear wheel rotatable about a rear hub, a set of pivoting members connecting the front and rear frames through pivotal connections and a biased dampening device, the pivoting members including:

a lower member extending from a first lower join to a second lower join; and a mid member extending from a forward mid pivot to a rear mid pivot, wherein:

the forward mid pivot and the second lower join are connected to the front frame at pivots with fixed axes relative to the front frame;

in a first resting position in which the rear hub lies below the instant centre: the forward mid pivot and the second lower join lie in a substantially upright plane;

the first lower join lies in a substantially lateral plane; and

the rear mid pivot is positioned below the lateral plane,

in a second activated position in which the biased dampening device is actuated and the rear hub is raised above the instant centre:

the lower member rotates so that the first lower join travels rearwardly through the upright plane; and

the mid member rotates so that the rear mid pivot travels upwardly through the lateral plane.

2. A bicycle as claimed in Claim 1, wherein the instant centre moves rearwardly and downwardly from the first position to the second position relative to the front frame.

3. A bicycle as claimed in Claims 1 or 2, wherein the instant centre travels through a path intersecting the forward mid pivot relative to the front frame.

4. A bicycle as claimed in Claim 3, wherein the path intersects a substantially horizontal cylindrical footprint corresponding to the axial bore or bolt of the forward mid pivot.

5. A bicycle as claimed in Claim 3 or 4, wherein the path follows a

rearward and downward inclined trajectory at an angle theta relative to the front frame.

6. A bicycle as claimed in Claim 5, wherein the angle theta is 30 - 35 degrees relative to a horizontal plane, when both front and rear wheels are at rest on a flat surface.

7. A bicycle as claimed in any one of Claims 3 to 6, wherein the length of the pathway is less than the spacing between the rear mid pivot and the forw ard mid pivot.

8. A bicycle as claimed in any one of Claims 1 to 7, wherein the bicycle further includes a drivetrain and an idler pulley, the drive train including a chain wrapped around and engaged with a set of sprockets, a first sprocket of the set of sprockets is coaxial with and fixed to the rear hub, a second sprocket of the set of sprockets is fixed to a pedal shaft, pedal arms extend from the pedal shaft and pedals are attached to free ends of the pedal arms, the idler pulley including a third sprocket of the set of sprockets and the chain is engaged with and extends between the second sprocket and the third sprocket and the third sprocket and the first sprocket and in the first position.

9. A bicycle as claimed in Claim 8, wherein an upper most point of the third sprocket is vertically above an uppermost point of the first sprocket. 10. A bicycle as claimed in Claims 8 or 9, wherein an uppermost point of the third sprocket is within 30 millimetres of the instant centre.