A gear assembly comprises a housing, a first gear shaft in the housing, a first spiral gear coupled to the first gear shaft in the housing, a second gear shaft in the housing, a second spiral gear coupled to the second gear shaft in the housing, and a fluid connection between a first chamber and a second chamber. The first spiral gear and the second spiral gear couple to define the first chamber and the second chamber within the housing.

Apparatus and associated methods relate to a sliding door closure system. The sliding door closure system includes a safety cushion device configured to be suspended. The safety cushion device may advantageously prevent injuries to a person's hands, feet, fingers, body parts and/or injury to pets. The sliding door closure system includes an anchor situated in a vertical closure track of a sliding door configured to be coupled to the suspension suspending the safety cushion device. In a closure mode, the safety cushion device may be displaced out of the vertical closure track of the sliding door so the sliding door may abut the vertical track frame. In a safety mode when the sliding door is closing, gravity urges the safety cushion device into a position separating the sliding door from a frame so that the safety cushion device absorbs the impulse of the sliding door.

A pivot sliding door guiding device includes a longitudinal profile with a guiding track and slider, supported on support rollers in a linearly movable manner in the guiding track, and which is connected to a door leaf and transfers a bearing load onto the slider. In the guiding track, convex bearing members extending in the longitudinal direction are disposed, on which support rollers of the slider with, in each case, peripherally extending concave guiding grooves roll and are retained in the transverse direction. The door leaf is connected to the slider whereby a center of gravity acts off-center on the slider in running and transverse directions. The slider has support rollers which serve for the load transfer of the load acting from the door leaf on the slider. The rollers roll on upper and lower convex bearing members, and transfer load of the door leaf via the convex bearing members.

A guiding device for a door system, in particular a sliding or pivot sliding door system of a public transport vehicle, includes: a longitudinal profile formed from a first material for attachment to a door portal, which has a guiding track, which is U-shaped in cross section, with a bottom surface and two side walls extending at right angles therefrom, a slider, which at least partially reaches into the guiding track and is supported on rolling members in a linearly movable manner in the guiding track, wherein a bearing member formed from a second material is disposed in the guiding track, which extends along the guiding track and on which the rolling members supporting the slider roll during a linear movement of the slider, the second material forming the bearing member is harder than the first material forming the longitudinal profile.

This disclosure is directed to a driving device for driving a swing member which has a driving power source, a power transmission assembly driven by the driving power source, a screw assembly and a clutch assembly arranged between the power transmission assembly and the screw assembly. The screw assembly has a nut and a screw rod screwed with each other. The screw rod has an end connected with the swing member. The nut can be operated by the clutch assembly to connected to or release the power transmission assembly. When the nut is connected to the power transmission assembly, the power transmission assembly is driven by the driving power source, so that the nut is driven by the power transmission assembly to move the screw rod and allow the swing member to be operated by an external force in any status during a power-driven operation of opening or closing.