What is the function of the oscillating plate?

The oscillating plate is a component located on top of the piston, and its main function is to join the cabin and the stem. In the case of installations direct action (1:1), this union must be flexible.

This component complies with EN 81.2, article 12:

• 12.2.2 Cabin/rod (cylinder) union.
• 12.2.2.1 In the case of a direct action elevator, the connection between the cabin and the rod must be flexible.
• 12.2.2.2 The connection between the cabin and the rod must be made so that it can withstand the weight of the rod and the additional dynamic forces. The connection devices must be safe.

The design of the swash plate (see diagram) ensures that the connection between the chassis (cab) and the piston rod is made in a safe and flexible way, allowing the chassis to flex at all times. If an unbalanced force is applied to the cab or chassis, the swash plate absorbs it, thus preventing the piston rod from deforming. The following diagram shows an example of an unbalanced force on the swash plate.

Depending on the piston model and its diameter, the dimensions of the oscillating plate will also vary (see dimension drawing).

Related posts:

• Basic elements of a hydraulic elevator (I and II)
• Differences between conventional pistons and telescopic pistons