Abstract: A counter-weight balanced X-ray frame (1) has a vertical column (2) on which a pendulum arm (3) carrying X-ray equipment (4, 5) is mounted for vertical movement therealong and rotational movement therearound. A brake disc (10) for arresting rotational movement and actuated by a magnetic brake (11) is incorporated in a centering mechanism adapted to seek one or more pre-determined positions for the pendulum arm, e.g. when it forms an angle with the frame of 0.degree., 90.degree., 180.degree. or 270.degree., without the operator needing to interfere in the sequence of movements. When the relevant setting position is approached, the operator need only carry out the operating movement which activates corresponding brake means--for example releases a corresponding operating handle on the pendulum arm--whereupon the pendulum arm itself adopts the pre-determined setting position.

Abstract: A fixing means for detachably mounting X-ray films (1) or the like to an illuminated surface (2) of an X-ray examining cabinet (3) comprises a resilient member (4) made of rubber, plastics or the like and having an anchoring portion (4a), an engaging portion (4b) and an intermediate, thinner hinge means (4c). The resilient member (4) is accommodated in a profiled frame element having a lower support part (5b) which supports the engaging portion (4b) so that it forms a right angle or an acute angle with the anchoring portion (4a).