Patent ID: 7574944

Claim:
A cam wheel assembly comprising: a fixed member having a center axle hole and at least one pair of first interference members symmetrically disposed at a first side thereof; and a movable member comprising a center mounting hole axially aimed at said center axle hole of said fixed member, at least one pair of guide rods axially symmetrically extending from one side of the periphery of said center mounting hole and inserted into the center axle hole of said fixed member for guiding rotation of said movable member relative to said fixed member, and at least one pair of second interference member arranged on one side thereof around said at least one pair of guide rods and said center mounting hole and disposed in contact with the at least one pair of first interference members of said fixed member for causing a torsional force upon rotation of said movable member relative to said fixed member through an angle; wherein the first interference members of said fixed member include a first outer sliding block, a first inner sliding block, a second outer sliding block and a second inner sliding block; wherein each of said first outer sliding block, said first inner sliding block, said second outer sliding block and said second inner sliding block are alternatively arranged on the first side around the center axle hole of said fixed member; the second interference members of said movable member include a first outer sliding groove, a first inner sliding groove, a second outer sliding groove and a second inner sliding groove; wherein each of said first outer sliding groove, said first inner sliding groove, said second outer sliding groove and said second inner sliding groove are alternatively arranged around the center mounting hole of said movable member corresponding to the first outer sliding block, the first inner sliding block, the second outer sliding block and the second inner sliding block of said fixed member.