Abstract: An electrical plug connector includes a plug connector housing and a connecting lever. The connecting lever is rotatable with respect to the plug connector housing between an initial position and an end position. The connecting lever includes a locking element having a first part fixed to the connecting lever and a second part displaceable relative to the first part. The locking element mechanically locks the connecting lever in the end position to the plug connector housing when the connecting lever is in the end position and the second part is displaced relative to the first part to a locking position. The first and second parts of the locking element respectively carry first and second sections of an optical code. The optical code is completed when the second part is displaced relative to the first part to the locking position whereby the optical code is detectable by an optical reading device.

Abstract: A switch having an actuating handle, a restoring mechanism, a contact carrier, and a rocker. The handle is rotatable to be movable upward and downward and moves downward in response to being actuated. The restoring mechanism is movable upward and downward and is biased to move upward. The handle forces the restoring mechanism to move downward in response to being actuated. The carrier is displaceable between two positions. The rocker is rotatable and an end of the rocker facing away from the swivel axis is engaged with the carrier. During downward movement the restoring mechanism swivels the rocker in a first direction thereby causing the rocker to displace the carrier from one position to the other. During upward movement the restoring mechanism swivels the rocker in an opposite direction thereby causing the rocker to displace the carrier back to the original position.

Abstract: Tower silos and similar tower-shaped storage spaces for solid material are filled and discharged by means of a device arranged vertically slidably on a hollow post and capable of rotating around its vertical axis. The device comprises distributing means, maintained at a constant height above the top level of the material; the filling is accomplished pneumatically through the hollow post and the discharge is accomplished through a central space left after removal of a piston taken along in the course of filling by the distributing means.