Abstract: An X-ray apparatus having a hydraulically controlled counterweight. A flexible roll diaphragm seals each piston to each cylinder in the system.

Abstract: The invention improves the safety in the case of breakage of an endless chain whereby a part of an X-ray apparatus table top is supported and displaced by a chain. The chain is accommodated inside a rigid guide having a slot through which the chain is coupled to the table top. The guide is constructed so that the chain has only a limited freedom of movement on all sides.

Abstract: The invention relates to an X-ray unit which can be swivelled about a horizontal axis. The table is moved by a lever arrangement in which the longitudinal position of the table is a function of the swivel angle so that a greater low head position can be achieved.

Abstract: An X-ray apparatus comprising a film holder which is displaceable between a number of recording positions and a parking position and which can be locked in each of the recording positions by means of a latch co-operating in the parking position, with a catch which unlocks the latch and intermittently displaces the film holder to the next recording position.

Abstract: A clamping device for medical apparatus includes a clamping member which act under the influence of spring bias force to permit upward displacement of the apparatus with minimal force and downward displacement of the apparatus when a predetermined applied force is exceeded. One handed adjustment of the apparatus position is thus enabled.

Abstract: Apparatus comprising a parallelogram which is movable in one plane and which is formed by a first and a second coupling rod and a part of a first and a second supporting rod for a medical device and a counterweight therefor, respectively. The coupling rods are pivotably connected near one end to the first supporting rod and are pivotably connected to the second supporting rod near their other end. The parallelogram is pivotable about a stationary shaft which extends perpendicularly to the plane of movement. This shaft is situated between the two pivots of a coupling rod.

Abstract: In X-ray examining apparatus in which a compression counterweight is uncoupled in the vertical position, a problem exists in that, when the examining apparatus is turned over, the compression counterweight is coupled to the X-ray image section with a jolt. So as to avoid this jolt, pneumatic damping devices are known which, however, are very voluminous. According to the invention, a simple and efficient device for the damped coupling comprises a control circuit which brakes the counterweight when it exceeds a given speed.

Abstract: A motor drive for an X-ray examination apparatus, in particular for the displacement of an auxiliary apparatus (imaging section). The motor has coupled thereto a tachometer, the output signal of which is differentiated and fed back to the motor control system such that a positive loop gain < 1 arises. The drive system delivers a torque which is proportional to the force delivered by the operator when a linear relationship exists between the control quantity of the motor and the torque thereof. In the case of a collision with the patient, the force exerted by the imaging section on the patient substantially does not exceed the manual force exerted by the operator, not even if the motor force amounts to a multiple of the force delivered by the operator.

Abstract: The servo drive according to the invention includes a force transducer which is disposed so as to sense all the forces which act on the image-forming section (the weight of the section, the manual force of the user, frictional forces and acceleration forces). On the signal from the transducer there is superposed a signal which corresponds to the weight of said section and to the speed variations dn/dt, i.e., to the acceleration forces. Thus the influence of these forces on the output signal is compensated for. The resulting signal serves as the desired value for a speed or acceleration control.

Abstract: The invention relates to an X-ray examination apparatus comprising a counterweight for the image section which is movable in the compression direction.The counterweight is suspended from the apparatus frame so as to be movable in the compression direction. Using a telescopic shaft and a system of belts and rollers, the counterweight acts to compensate for movements of the image section in the compression direction.