Abstract: A clamping jaw (10) for a clamping device, adapted to be mounted on a profile member (31) is formed by two separate jaw members (11) and a common rear counter support (12) for said members, which is arranged to transmit clamping forces produced by means of clamping bolts (32) to the two jaw members (11). The jaw members (11) and the counter support (12) have cooperating engagement means (13, 15) for placing and holding the jaw members (11) in predetermined positions in relation to the counter support (12). In order to make it possible to adapt the clamping jaw (10) to profile members of different shape and size, the engagement means (13, 15) are arranged to permit each jaw member (11) to be placed and held in a plurality of different positions in relation to the counter support (12).

Abstract: An assembly for supporting an elongate mast in horizontal position atop a vehicle and for pivotal movement of the mast into a substantially vertical position behind the vehicle includes an elongate support frame which is attached to the roof of the vehicle. The frame has elongate guides and the mast has wheels which run in the guides. The wheels are located between the lengthwise point of balance of the mast and the back end of the frame. The mast has an inboard position in which it is supported horizontally on the frame and it can be moved to an outboard position at the end of the frame in which it can be pivoted vertically about the wheels.