Thermally actuated switch
AssigneeElectrovac, Fabrikation elektrotechnischer Spezialartikel Gesellschaft m.b.H.
InventorHans-Peter Morbitzer
Life of this patent
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Abstract
A temperature sensor includes a sensor tube and a sensor rod received in the sensor tube and having a thermal expansion coefficient which differs from a thermal expansion coefficient of the sensor tube. The sensor rod has one end, which is supported by a free end of the sensor tube, and another end, which forms an actuating element of a switching contact assembly. An insulating member at least partly surrounds the switching contact assembly and has an opening for passage of the sensor tube with accommodated sensor rod. Mounted to the insulating member in the area of the opening is a support plate which is connected at least indirectly to the sensor tube by a welding process such that an opening-surrounding wall portion of the insulating member is held in place.
Claims28
A temperature sensor comprising:
- a sensor tube;
- a sensor rod received in the sensor tube and having a thermal expansion coefficient which differs from a thermal expansion coefficient of the sensor tube, said sensor rod having one end, which is supported by a free end of the sensor tube, and another end, which forms an actuating element of a switching contact assembly;
- an insulating member constructed to at least partly surround the switching contact assembly and having an opening for passage of the sensor tube with accommodated sensor rod;
- a support plate mounted to the insulating member in the area of the opening and connected at least indirectly to the sensor tube by a welding process such that an opening-surrounding wall portion of the insulating member is held in place, and
- a tubular insert placed into the opening for support of the sensor tube, said support plate welded to the tubular insert so that the opening-surrounding wall portion of the insulating member is held between the support plate and the tubular insert.
A temperature sensor, comprising:
- a sensor tube having a free end and defining an interior;
- a sensor rod received in the interior of the sensor tube and having a thermal expansion coefficient which differs from a thermal expansion coefficient of the sensor tube, said sensor rod having one end, which forms an actuating element of a switching contact assembly, and another end;
- and
- an end piece for supporting the other end of the sensor rod in the area of the free end of the sensor tube, said end piece having a configuration of a tubular cap which is permanently placed over the free end of the sensor tube, wherein the one end of the sensor rod is supported against an inner side of the tubular cap, which inner side confronts the interior of the sensor tube, said tubular cap having a thermal expansion coefficient which substantially corresponds to the thermal expansion coefficient of the sensor tube, thereby effectively extending an active length of the sensor tube.
Dependencies are inferred from the claim text.