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US 8,132,833 B2Granted
Use of an intumescent material and device having a material of this type
AssigneeAssa Alboy Sicherheitstechnik GmbH
InventorRudolf Schnekenburger
Life of this patent
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Abstract
The invention relates to the use of an intumescent material as a sensor, actuator, or fixing means for movable elements in the field of fire and smoke protection.
Claims6
A door opener, comprising:
- a housing with an inner wall;
- a pivot latch;
- a changeover switch;
- an armature;
- an intumescent material, having an expansion temperature, positioned on the inner wall of the housing proximate to the armature;
- and
- a plurality of free spaces disposed between the inner wall and the pivot latch, the inner wall and the changeover switch, and the inner wall and the armature,
- wherein the intumescent material volumetrically expands into the free space between the inner wall and the armature and permanently embeds the armature in a locking position when the expansion temperature has been reached.
5 more elements
Dependencies are inferred from the claim text.