Clamping device for connecting bicycle rack to bicycle

A clamping device for connecting a bicycle rack to a bicycle, comprising:

• a first clamp (11), a second clamp (30) and a bar (20), two ends of the bar (20) respectively extending through the first and second clamps (11, 30), wherein the first clamp (11) includes two clamp parts (111) which are pivotably connected to each other and a passage (13) formed through the first clamp (11) for the bar (20) to extend therethrough;
• the second clamp (30) being a C-shaped clamp and including a first part (31) and a second part (32) which is integrally formed to the first part (31) so as to form a C-shaped space (33) between the first and second parts (31, 32), the first part (31) including an annular groove (311) formed to the outside thereof, the second part (32) including a first engaging portion (34) formed to an outside thereof, the first engaging portion (34) including a recess (341), eight first teeth (35) circumferentially disposed on a bottom face of the recess which extend radially inward from an inner periphery of the recess (341), each of the first teeth (35) including a curved face (351) formed to a peak thereof, the bar (20) extending through the first part (31), the C-shaped space (33) and the second part (32), the second clamp (30) including a path (36) formed through the first part (31), the C-shaped space (33) and the second part (32) for the bar (20) to extend therethrough, and
• a block (40) partially engaged with the recess (341) and connected to one of the two ends of the bar (20) that protrudes beyond the second part (32) and includes a connection end (21), the block (40) including a second engaging portion (41) which includes an extension section (411) facing the second part (32), the extension section (411) engaged with the recess (341) and including eight second teeth (42) circumferentially disposed on an end face of the extension section which correspond to and are engaged with the eight first teeth (35), each of the second teeth (42) including a pg,10 curved face (421) formed to a peak thereof, wherein the curved faces (351, 421) of the first and second teeth (35, 42) allow the first teeth (35) to be engaged with the second teeth (42) even when the bar (20) is slightly rotated, so that the block (40) is not freely rotated relative to the second clamp (30).