Abstract: An elastic axial-rotation coupler has two inelastic devices for respective, inelastic connection to the two axially-rotatable structures, one of the devices defining an annular chamber therein. The annular chamber is closed axially and radially outwardly by the inelastic device defining it. At least one resilient element is in the annular chamber and connected to each device for rotatably coupling them resiliently and, thereby, so coupling the axially-rotatable structures which can be connected to the devices. The resilient element preferably is a rubber-elastic body. At least when the structures axially rotate the devices, a liquid is also in the annular chamber for impinging on the resilient element where the centrifugal force of its rotation with the devices would distort it. The liquid preferably has substantially the same density as the resilient element.

Abstract: An air spring, for suspension of a vibrating body on a base, comprising a bellows with an air-filled interior which can be connected as needed by a control valve to a compressed-gas reservoir or to the atmosphere. The control valve is actuated by a piston whose front face is acted upon by the internal pressure of the air spring bellows and whose rear face is acted upon by a gas cushion of variable pressure contained in a pressure chamber, and which produces a compensation of vibration-caused pressure changes in the bellows by feeding additional compressed air in or letting compressed air out. The pressure chamber is provided with a signal-operated inlet valve and a signal-operated outlet valve, and these valves are electrically connected to the signal transmitter of a displacement detector.

Abstract: An elastic axial-rotation coupler has two inelastic devices for respective, inelastic connection to the two axially-rotatable structures, one of the devices defining an annular chamber therein. The annular chamber may be open radially inwardly, but is closed axially and radially outwardly by the inelastic device defining it. At least one resilient element is in the annular chamber and connected to each device for rotatably coupling them resiliently and, thereby, so coupling the axially-rotatable structures which can be connected to the devices. The resilient element preferably is a rubber-elastic body. At least when the structures axially rotate the devices, a liquid is also in the annular chamber for impinging on the resilient element where the centrifugal force of its rotation with the devices would distort it. The liquid preferably has substantially the same density as the resilient element.