Abstract: The invention relates to a device for injecting a medium into or underneath the skin with a series of pressure pulses. The device includes a reservoir (1) for the medium, an application unit (10) to inject the medium into or under the skin, a hydraulic high-pressure pump (6) to pump the medium out of the reservoir (1) into the applicator unit (10), and an electronic control unit (11) that is suitable for regulating the applicator unit (10) such that the medium is injected with a series of pressure pulses into or underneath the skin.

Abstract: The invention relates to a device for injecting a medium into or underneath the skin with a series of pressure pulses. The device includes a reservoir (1) for the medium, an application unit (10) to inject the medium into or under the skin, a hydraulic high-pressure pump (6) to pump the medium out of the reservoir (1) into the applicator unit (10), and an electronic control unit (11) that is suitable for regulating the applicator unit (10) such that the medium is injected with a series of pressure pulses into or underneath the skin.

Abstract: A blade for liquid friction couplings consists of a disc (1), which is formed in its effective end faces with a plurality of substantially radially extending interruptions (4, 4'). To increase the torque limit without a loss of strength and without an increase of the blade spacing, the interruptions consist of grooves (4, 4'). The grooves (4) on one end face are staggered from the grooves (4') on the other end face.

Abstract: A fluid friction coupling or clutch unit is disclosed. The coupling includes a housing which is substantially filled with a viscous liquid. The housing comprises inner and outer parts which are concentrically disposed and rotate about an axis. The fluid friction coupling also includes mutually interleaved inner and outer plates within the housing, the inner plates being coupled to rotate with the inner part of the housing and outer plates being coupled to rotate with the outer part of the housing. The individual inner and outer plates are separated from each other and are axially displaceable so as to vary the size of the gap between them. Annular disc springs are disposed within the gaps between the plates. The annular disc springs are shaped as truncated cones. They act to spread the plates apart. In a preferred embodiment, the fluid friction coupling also includes a pressure body connected to the inner and outer plates.

Abstract: A temperature compensating fluid friction clutch is disclosed. The fluid friction clutch comprises a housing substantially filled with a viscous fluid, a shaft disposed within the housing, and mutually interengaging inner and outer plates connected to the shaft and housing for rotation about an axis within the housing. Spacers are located in the gaps between the plates, while the plates are axially displaceable so as to vary the size of the gaps. Temperature responsive elements are also provided to compensate for any reduction in the fluid viscosity when the temperature of the fluid rises. The temperature responsive elements, which may be in various forms, act to decrease the size of the gaps between the inner and outer plates when the temperature of the viscous fluid rises. In one embodiment, the temperature responsive elements comprise an expansion element connected to the inner and outer plates and which expands upon an increase in temperature.