Patent ID: 8714328

Claim:
A hub assembly comprising: a hub having a first hole defined in one end thereof and a first slot defined in an inner periphery of the first hole, the first slot being parallel to an axis of the hub, an axle located in the first hole; a tubular portion having a second hole in one end thereof and a second slot defined in an inner periphery of the second hole, the second slot being parallel to an axis of the tubular portion; an annular driving member having multiple first teeth defined in an outer periphery thereof, the first teeth located corresponding to the second slot, the driving member having a cone-shaped first ratchet portion formed axially thereon, the cone-shaped first ratchet portion having a plurality of first and second triangular contact surfaces disposed in a conical arrangement about the axis of the tubular portion, the first and second triangular contact surfaces having different areas, the first teeth engaged with the second slot to maintain the driving member movable linearly in the second slot; an annular passive member having multiple second teeth defined in an outer periphery thereof, the second teeth located corresponding to the first slot, the passive member having a cone-shaped second ratchet portion formed axially thereon, the second ratchet portion defining a plurality of contact surfaces disposed in a complementary conical arrangement about the axis of the hub to conically engage the first ratchet portion in radially opposed manner, the second teeth of the passive member engaged with the first slot and the passive member movable linearly in the first slot, and a returning member unit having two returning members respectively located between the hub and the passive member, and between the tubular portion and the driving member.