Magnetek Universal Manufacturing Corporation

Magnetek, Inc.

Lothar Freimuth

Raymond H Van Wagener

Robert A Kulka

Michael A Stein

A housing of electrical insulating material for a thermal protector used with an inductive device, such as a ballast transformer, in which the housing has an open portion through which the case of the thermal protector is accessible to be placed adjacent a part of the inductive device to sense its temperature. The housing also has an aperture through which a current carrying inductor device lead wire connected to the protector extends. An adhesive tape on the housing is used to fasten the housing to the inductor. An insulated part of the housing protects a junction of a current carrying wire connected to the protector and a wire of a coil of the inductive device.

Housing and mounting arrangement for thermal protector device

A ballast assembly for a fluorescent lighting fixture includes a magnetic core, a primary winding and a secondary winding, both windings mounted on a central leg of the core, with a shunt disposed between the windings to prevent a flux generated by the primary winding from coupling with a flux generated by the secondary winding. The ballast further includes means for securing the shunt comprising a wall placed between the windings, with the wall having one or more structures formed integrally on the wall for engaging the shunt. The wall may comprise a flange of a bobbin, or be free standing. Using formed structures eliminates the need for winding tape around the shunts to provide an air gap between the sunt and the core. This assures long-term stability and reduces the potential for nuisance humming.

Shunt holding means for ballasts

A wire bobbin (1) for use with inductive devices is disclosed having a central core (2) about which a wire is windable, with side walls (3) and (4) oppositely disposed about the core for retaining the wire thereon. A coil of wire, wound about the core, has a wire end (20) extending through at least one side wall. The side wall further includes a first channel (7) sized to retain a lead wire (21) therein, with the channel open at both ends. A second channel (13), which is preferably directly adjacent to the first channel, communicates through an open end (9) with the first channel. The lead wire is then inserted into the first channel, with a stripped end (22) extending into the second channel. The stripped end is combined with the magnet wire end, permanently joined, such as by dip soldering, and then bent into position within the second channel. Utilizing channels on the side wall minimizes extending structures which might interfere with other structures, making these wire bobbins particularly useful in transformers with limited space.

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Franklin Lakes, NJ, United States of America

Lothar Freimuth