Abstract: A vehicle roof rack structure includes a first clamp assembly, a second clamp assembly and a driving member. The first clamp assembly has a first positioning member. The second clamp assembly, aside to the first clamp assembly, has a second positioning member with a second-clamp-assembly bevel surface. The driving member for driving the second clamp assembly includes a screw bar, a driving block and a vehicle-roof bar. The screw bar engages the first and the second positioning members. The driving block, engaging the screw bar, has a driving-block bevel surface to contact the second-clamp-assembly bevel surface. The vehicle-roof bar has an end to mount the first and the second clamp assemblies. When the screw bar rotates, the screw bar drives the driving block to drive the first and the second clamp assemblies to clamp or release the vehicle-roof mounting rack in between.

Abstract: The present invention provides a structure of a roof rack, which includes: a base, which has one side forming a first clamping section; a fixing member, which has one side forming a second clamping section, the second clamping section and the first clamping section being arranged to correspond to and movable with respect to each other for clamping purposes; a rod, which has one end coupled to the base, the rod extending through the fixing member to project out, the rod having an opposite end coupled to an extension coupler; and a roof transverse bar, which is coupled to the base and the fixing member, the roof transverse bar having at least one coupling slot.

Abstract: The present invention provides a structure of a roof rack, which includes: a base, which has one side forming a first clamping section; a fixing member, which has one side forming a second clamping section, the second clamping section and the first clamping section being arranged to correspond to and movable with respect to each other for clamping purposes; a rod, which has one end coupled to the base, the rod extending through the fixing member to project out, the rod having an opposite end coupled to an extension coupler; and a roof transverse bar, which is coupled to the base and the fixing member, the roof transverse bar having at least one coupling slot.