Abstract: Even when designing drivetrains for elevator installations, an advantageous compromise between required resources and achievable technical (performance) data is desirable. Especially in the case of drivetrains with a belt drive, the shaft interacting with at least one belt at a driving zone requires structural optimization in order to be able to make use of improvement potential including with regard to further components of the drivetrain. According to the disclosure, the shaft has an absolute shaft length which is predefined by length dimensioning with reference to the width of the driving zone. In this way, a particularly advantageous compromise on the basis of length dependency and optionally in addition also of diameter dependency can be found, in particular in terms of optimization concerning both the material-machining outlay and smallest possible dimensions, wherein the respective drivetrain, on the basis thereof, can also be designed for different applications.

Abstract: The present disclosure provides for a drivetrain arrangement for a drive unit of an elevator system. The drive unit includes at least one belt drive, with a shaft mounted in a housing in a fixed bearing and in a movable bearing. The fixed bearing can be/become secured in an axially fixed manner on the shaft without a bearing cover in several circumferential positions in each case via at least one disc interacting with the housing. A reservoir is configured between the bearings and a brake unit to receive bearing grease. An inner diameter of the fixed bearing is smaller than or greater than an inner diameter of the movable bearing such that in the axial assembly direction, the bearing with the larger inner diameter can be brought over the shaft portion intended for the bearing with the smaller inner diameter. This simplifies the assembly and implementation of the drive.

Abstract: The invention relates to a coolable optical table with a table top and at least three table legs. Securing means for securing objects such as optical elements are provided in a table surface of the table top. The table legs are equipped with a damping device for damping vibrations.

Abstract: The invention relates to a coolable optical table with a table top and at least three table legs. Securing means for securing objects such as optical elements are provided in a table surface of the table top. The table legs are equipped with a damping device for damping vibrations.