CROSSBAR CLAMP ACTUATOR

1 . A vehicle rack for carrying cargo, comprising:

a clamp having a seat and a connector movable relative to the seat; and

a clamp actuator including a threaded member engaging a traveling wedge block, and a wedge follower contacting a surface of the wedge block, wherein rotation of the threaded member causes movement of the wedge block and the wedge follower in relatively orthogonal directions.

2 . The vehicle rack of claim 1 , wherein the traveling wedge block has a ramped, downward-facing first slide surface, and

the wedge follower is coupled to and movable with the crossbar connector, the wedge follower having a second slide surface in frictional contact with the first slide surface of the traveling wedge block, such that substantially horizontal repositioning of the traveling wedge block causes the ramped first slide surface to urge the wedge follower downward, moving the crossbar connector downward relative to the crossbar seat.

3 . The vehicle rack of claim 2 , wherein the first slide surface of the traveling wedge block is a substantially planar surface.

4 . The vehicle rack of claim 3 , wherein the ramped first slide surface defines a first ramp angle, and the second slide surface is ramped at a second ramp angle complementary to the first ramp angle.

5 . The vehicle rack of claim 2 , wherein the threaded member is inserted into an end of the traveling wedge block, such that rotation of the threaded member is configured to cause the horizontal repositioning of the traveling wedge block.

6 . The vehicle rack of claim 2 , wherein the traveling wedge block is horizontally repositionable parallel to a long axis of a crossbar.

7 . A rack for carrying cargo on top of a vehicle, the rack comprising:

a crossbar; and

a pair of couplers configured to mount the crossbar on top of a vehicle such that a long axis of the crossbar is substantially horizontal and perpendicular to a longitudinal axis of the vehicle;

wherein each coupler includes:

a crossbar clamp having a crossbar seat and a crossbar connector movable relative to the crossbar seat; and

a crossbar clamp actuator comprising:

a horizontally traveling wedge block having a ramped, downward-facing first slide surface, and

a wedge follower coupled to and movable with the crossbar connector, the wedge follower having a second slide surface in frictional contact with the first slide surface of the traveling wedge block, such that repositioning of the traveling wedge block causes movement of the crossbar connector downward relative to the crossbar seat.