Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Reexamination Certificate
1999-11-17
2001-12-04
Picard, Leo P. (Department: 2835)
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
C337S380000, C337S112000, C337S113000, C361S025000, C361S026000, C361S105000, C310S06800R
Reexamination Certificate
active
06326879
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a thermal switch arrangement for electromagnetic coils, particularly of electric motors.
In many cases, electromagnetic coils are protected against excessive temperatures in the winding with the help of a thermal switch, which is also referred to as a “safety temperature limiter”. Excessive temperature in the winding of the coil former, which takes up the winding, or perhaps of a motor in its totality, could lead to damage or destruction of the motor or its parts. Moreover, overheating the motor also implies the danger of a fire. For this reason, the thermal switches are disposed and connected at or on the coil in such a manner, that they interrupt the current in the winding when a specified temperature is exceeded.
Usually, the thermal switches are connected in series with the windings. This can be accomplished, for example, owing to the fact that the thermal switch is soldered with one of its tags to a flat plug of the winding, which is fastened to the coil former, while the other end of the winding wire is soldered to the other tag of the thermal switch. The production of the two soldered sites represents a timeconsuming interruption of the installation of the coil, which not only delays the production, but also makes it more expensive. If soldering is carried out in the immediate vicinity of the coil, it is also possible for the soldering tin to reach the surface of the winding, damaging it. In particular, the insulation of the individual copper wires, generally enameled copper wire, may be damaged.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to simplify the process of attaching a thermal switch to a coil and to make it less expensive.
An inventive thermal switch arrangement is characterized in that the two tags of the thermal switch enter the pockets of the flat plug from the inner surface of the one end flange.
Since the flat plugs are pushed from the edge of the end flange in question into the insertion slots in the pockets and the tags enter the pockets from the inner surface of the end flange facing the winding, the paths of the tags and of the flat plugs cross essentially at an angle of 90°. This fact can be used for the purpose of initially pushing in or forcing in the tags and then the flat plugs. At the same time, the penetrating flat plugs bend the relatively pliable tags at right angles, so that the tags are fixed.
If the inlet openings, which produce the connection to the insertion slots from the inner surface of the end flange, are disposed at a small distance from the peripheral surface of the winding, the thermal switch, after the tags are pushed into these inlet openings, is automatically in a position on or close to the peripheral surface of the coil.
Between the peripheral surface of the winding and the thermal switch, a heat-resistant intermediate layer may be disposed, or the thermal switch can also be enveloped as a whole, in that, for example, a heat-resistant tube material is pushed over the thermal switch.
REFERENCES:
patent: 3842297 (1974-10-01), Pleiss, Jr. et al.
patent: 3959675 (1976-05-01), Lautner et al.
patent: 4112405 (1978-09-01), Joseph
patent: 4132913 (1979-01-01), Lautner et al.
patent: 4163913 (1979-08-01), Barratt
patent: 4181393 (1980-01-01), Lill
patent: 4186318 (1980-01-01), Anderson
patent: 4188553 (1980-02-01), Wheaton
patent: 4250419 (1981-02-01), Zolman
patent: 4251911 (1981-02-01), Reynolds et al.
patent: 4476407 (1984-10-01), Hildebrandt et al.
patent: 5463522 (1995-10-01), Van Wagener et al.
patent: 9004943 (1991-11-01), None
patent: 4142180 (1993-07-01), None
patent: 4243845 (1994-06-01), None
patent: 57-199453-A (1982-12-01), None
patent: 7-222403-A (1995-08-01), None
patent: 7-336923-A (1995-12-01), None
patent: 10-271766-A (1998-10-01), None
Hangmann Werner
Krogmeier Norbert
Paul Matthias
Wistinghausen Walter
Goldberg Richard M.
Hanning Elektro-Werke GmbH & Co. KG
Picard Leo P.
Vortman Anatoly
LandOfFree
Thermal switch arrangement for electromagnetic coils does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermal switch arrangement for electromagnetic coils, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal switch arrangement for electromagnetic coils will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2591440