Patent ID: 7515683

Claim:
A unit for acquiring dental radiographic images of a patient comprising: an x-ray head, a supporting arm of the x-ray head, coupling means of the x-ray head to the supporting arm, wherein said coupling means comprise a ball joint comprising a spherical member carried by said supporting arm and x-ray head and a housing seat of the spherical member; and a locking device for locking the ball joint in a determined angular position, the locking device comprising at least one locking member mobile between a locking position of the spherical member inside said housing seat and a releasing position, and actuating means for shifting the locking member between said locking and releasing positions; wherein the ball joint comprises a first plate provided with said housing seat; the locking device comprising a second plate, which extends about the spherical member, defines said locking member, and is rotationally coupled to the first plate to oscillate, with respect to the first plate, between said locking and releasing positions; and the actuating means comprising an actuating cylinder for shifting the second plate from the locking position to the releasing position.