Patent ID: 8316588

Claim:
A rig for drilling or maintaining oil wells comprising: a base structure with a support platform on the ground and a raised work platform; a deck co-planar to and integral with the support platform and which is suitable for housing transport means; a telescopic antenna provided with two fixing eyelets arranged at the lower end of the telescopic antenna to be hinged onto the work platform; and a lifting device suitable for lifting the telescopic antenna from a transport position, wherein the telescopic antenna is positioned on the transport means with the two fixing eyelets at a lower level than the level of the work platform, and a working position, wherein the telescopic antenna is vertically arranged on the work platform with the fixing eyelets hinged to the work platform; wherein the lifting device comprises a moving articulated structure having at least two rocker arms hinged to the telescopic antenna and which are hingedly mounted to the deck, wherein a first one of the rocker arms is hinged to the telescopic antenna at a first hinge and is mounted to the deck at a second hinge and a second one of the rocker arms is hinged to the telescopic antenna at a third hinge and is mounted to the deck at a fourth hinge, wherein the rocker arms have an equal length and are parallel, and wherein the distance between the first hinge and the third hinge and the distance between the second hinge and the fourth hinge are equal, and wherein at least one linear actuator with a variable thrust head is interposable between the telescopic antenna and the deck to oscillate the rocker arms and to lift the telescopic antenna.