Abstract: A door opening circuit comprises pipe-shaped housing and a button which can be moved axially in a housing in order to actuate a circuit component connected to the housing. The button is held in a rest position by a force and can be pushed in a direction opposing said force. Perpendicular to the push path of the bottom and pivotable about a pivot mount. A lever is provided perpendicular to the push path of the button and pivotable about a pivot mount. The lever acts upon a circuit component from a position at a distance to the pivotal mount, whereby the button impinges upon the lever between the pivotable mount and the aforementioned position. Another button is located concentrically to the first button on the reverse side of the housing. The pivotal mount is provided with a lever element. The lever can be moved in the direction of the housing longitudinal axis towards the first button.

Abstract: A door-opener switch has a cylindrical housing and a button axially movable in the housing for actuating a switch member. The button can be depressed against the action of a restoring force. The housing is provided, between its front and rear ends, with an outwardly radially protruding collar. Each of front and rear sides of the collar forms a stop surface. The stop surfaces, resting against a mounting plate, determine a distance of the front side of the housing from a front of the mounting plate.

Abstract: A spacer which serves to space and connect two panels which are arranged parallel, one behind the other, in particular for uniform distance setting between the front panel of a switchboard and a backside, parallel printed circuit board. The spacer includes a socket and a plug member which is engageable with the socket. The socket exhibits, concentrically around its central axis, at least four guides that are open in the direction of the plug member and which have a depth defined by stop faces of the socket. These guides form groups of varying depth, which lie radially symmetrically to the central axis, and the plug member has on a side thereof facing the socket, projections which are rotatable into suitable positions into the guides of a group.