Electromagnetically-operated door opener - has locking lever held by electromagnet against spring force

摘要

The door opener has locking lever remaining pre-released and attracted until a pivoted piece pushes a short arm belonging to the lever back when the door is pushed open. The lever's long arm breaks from the electromagnet and allows it to return again to its blocked state under the action of its spring when the opener is closed. The shank of the spring projects transversely into the region between the two coil cores in front of the long arm of the locking lever lying behind.