Abstract: A device, system, or method for changing the center of gravity of a bicycle, in particular an electric bicycle, to suit the situation, with: an actuator for changing the center of gravity of the bicycle, at least one sensor that monitors the riding status of the bicycle, a control unit which receives and processes data from the sensor, determines a center of gravity of the bicycle adapted to the situation and outputs corresponding control signals to the actuator in order to carry out the change in center of gravity. According to the invention, an adjustment speed of the change in the center of gravity can be adapted to a riding state of the bicycle.

Abstract: A spring device for the motion drive of a movable component from a rest position into a displaced position includes a gas spring and a preloaded spring, the movable component being loaded into the displaced position by a preloaded spring. The gas spring includes a pressurized gas-filled cylinder with a first end closed by a first end plate and a second end closed by a second end plate. A piston divides the interior of the cylinder into a first working chamber and a second working chamber. The piston having a first piston rod extending through the first working chamber and through the first end plate in a sealed manner, a free end of the first piston rod being fixed to the movable component or a stationary component, and a second piston rod extending through the second working chamber and through the second end plate in a sealed manner.

Abstract: A damping unit includes a cylinder which is filled with a damping fluid and in which a piston rod is guided, the piston rod associated with a bottom surface which has at least one axial through-hole which defines an effective flow cross section for the damping fluid; wherein the piston rod includes: a sleeve element which is fixed on the piston rod in the axial direction; a piston bottom element which is supported on the piston rod so as to be axially slidable and includes the bottom surface; a resilient element; and a termination element which is fixed on the piston rod in the axial direction and forms an indirect or direct stop for the piston bottom element in the insertion direction of the piston rod.

Abstract: A spring device for the motion drive of a movable component from a rest position into a displaced position includes a gas spring and a preloaded spring, the movable component being loaded into the displaced position by a preloaded spring. The gas spring includes a pressurized gas-filled cylinder with a first end closed by a first end plate and a second end closed by a second end plate. A piston divides the interior of the cylinder into a first working chamber and a second working chamber. The to piston having a first piston rod extending through the first working chamber and through the first end plate in a sealed manner, a free end of the first piston rod being fixed to the movable component or a stationary component, and a second piston rod extending through the second working chamber and through the second end plate in a sealed manner.

Abstract: A damping unit includes a cylinder which is filled with a damping fluid and in which a piston rod is guided, the piston rod associated with a bottom surface which has at least one axial through-hole which defines an effective flow cross section for the damping fluid; wherein the piston rod includes: a sleeve element which is fixed on the piston rod in the axial direction; a piston bottom element which is supported on the piston rod so as to be axially slidable and includes the bottom surface; a resilient element; and a termination element which is fixed on the piston rod in the axial direction and forms an indirect or direct stop for the piston bottom element in the insertion direction of the piston rod.

Abstract: A piston-cylinder unit with a center longitudinal axis, a first end, a cylinder filled with a fluid, a piston arranged so as to be displaceable in the cylinder and which divides the cylinder into a first work space remote of the first end and a second work space close to the first end. A piston rod is arranged at the piston and projects through the first work space and is guided out of the cylinder concentric to the center longitudinal axis at a second end opposite the first end so as to be sealed by a guiding and sealing device, and a sensor device for direct or indirect detection of the internal pressure of the piston-cylinder unit.

Abstract: A piston-cylinder unit with a center longitudinal axis, a first end, a cylinder filled with a fluid, a piston arranged so as to be displaceable in the cylinder and which divides the cylinder into a first work space remote of the first end and a second work space close to the first end. A piston rod is arranged at the piston and projects through the first work space and is guided out of the cylinder concentric to the center longitudinal axis at a second end opposite the first end so as to be sealed by a guiding and sealing device, and a sensor device for direct or indirect detection of the internal pressure of the piston-cylinder unit.

Abstract: Apparatus for the motorized opening and closing of a motor vehicle body part which can be pivoted with respect to a vehicle body about a hinged lid axis includes a guide cylinder having a first end and a second end which can be coupled to the body at a pivot axis which is parallel to the hinged lid axis, a piston guided displaceably in the cylinder, and a piston rod having one end attached to the piston and an opposite end which protrudes from the first end of the cylinder and can be coupled to the pivotable body part at a distance from the hinged lid axis. A drive device drives first and second Bowden cables, which extend in parallel from the second end of the cylinder, to displace the piston in the cylinder. The first Bowden cable includes a sheath which is supported on the piston and a core which is fixed to the first end of the cylinder. The second Bowden cable includes a sheath which is supported on the second end of the cylinder and a core which is fixed to the piston.

Abstract: A tension spring arrangement includes a pneumatic spring configured with a cylinder, which has a closed end coupled to a motor-vehicle body, and a piston and rod unit coupled to a hatch and operated so that when the piston and rod unit is displaced in the cylinder to a first position, the hatch is swung to a generally vertical open position, and when the piston and rod unit is displaced to a second position, the hatch is swung to a substantially horizontal closed position. The piston is shaped and dimensioned so as to define two cylinder chambers, which are in flow isolation upon displacement of the piston and rod unit toward the first position, and are in flow communication and under a substantially uniform pressure upon displacement of the piston and rod unit to the second position.

Abstract: Apparatus for the motorized opening and closing of a motor vehicle body part which can be pivoted with respect to a vehicle body about a hinged lid axis includes a guide cylinder having a first end and a second end which can be coupled to the body at a pivot axis which is parallel to the hinged lid axis, a piston guided displaceably in the cylinder, and a piston rod having one end attached to the piston and an opposite end which protrudes from the first end of the cylinder and can be coupled to the pivotable body part at a distance from the hinged lid axis. A drive device drives first and second Bowden cables, which extend in parallel from the second end of the cylinder, to displace the piston in the cylinder. The first Bowden cable includes a sheath which is supported on the piston and a core which is fixed to the first end of the cylinder. The second Bowden cable includes a sheath which is supported on the second end of the cylinder and a core which is fixed to the piston.

Abstract: Height adjustable object carrier column for use as a chair column of a revolving chair. The head area of the chair is moved back to a rest height and angular orientation with respect to the foot area of the chair upon relief of the chair load. The head area can be adjusted with respect to the foot area, by height adjustment apparatus, to different rest heights. Height adjustment is provided in the form of a hydraulic or a hydropneumatic or a spring-hydraulic or a pneumatic actuator with a cylinder assembly and a piston rod assembly which are coaxial to a telescope axis. The height adjustment apparatus includes internal biasing structure and first arbitrarily adjustable and second automatic blocking devices, whereby following a reduction of the load on the object carrier column, the second blocking device is released, and the height adjustment apparatus is moved toward a specified limit position, and the stop moves the object carrier column into the specified rest angular orientation.