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| High performance bicycle propulsion |
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| Two-phase permanent-magnet electric rotating machine |
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Flat resistors for automotive blower motor speed control or other service
| Details |
Inventors: Waite, Daryn L.; Anderson, Raymond S.; Smith, Scott D.;
Assignee: Indak Manufacturing Corp. (Northbrook, IL)
Primary Examiner: Donovan; Lincoln
Assistant Examiner: Lee; Richard K.
Attorney, Agent or Firm: Palmatier & Zummer, Palmatier; Francois N., Zummer; Anthony S.
The flat resistor comprises a stack of flat components including a first metal plate having assembly tabs bent, a first outer electrical insulator having alignment slots for receiving the tabs, a first sheet metal resistance element having slots for receiving the tabs with a clearance fit, a first inner electrical insulator having alignment slots for receiving the tabs, a metal midplate having oversize slots for receiving the tabs with a clearance fit, a second thin inner insulator having alignment slots for receiving the tabs, a second sheet metal resistance element having clearance slots for receiving the tabs, a second thin outer insulator having alignment slots for receiving the tabs, and a second metal outer plate having alignment slots for receiving the tabs, which are bent into engagement with the second plate for compressing the stack. The resistance elements have alignment tabs extending through alignment slots in the corresponding outer insulators and securely bent behind the insulators. The outer plates have clearance voids formed by outward embossments opposite the bent tabs. A thermal fuse is pressed by a wire spring against a V-shaped seat comprising lugs bent from the midplate at oppositely slanting angles. The wire spring is connected between the fuse and the lugs. |
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DETAILED DESCRIPTION One object of the present invention is to provide a new and improved flat package resistor unit having new and improved alignment and clamping means which are superior to the riveted construction employed heretofore.
Another object is to provide a new and improved resistor construction having an improved alignment and clamping system which inherently establishes and maintains the desired alignment of the flat components so as to prevent the production of defective resistor units.
A further object is to provide a new and improved alignment and clamping system which eliminates the use of rivets or other separate fasteners and employs alignment and clamping elements formed on the flat components.
Another object is to provide a flat package resistor construction having new and improved spring means for pressing the thermal fuse into firm engagement with the midplate so that good thermal conductivity is established and maintained between the thermal fuse and the midplate.
In accordance with the present invention, a plurality of clamping and alignment tabs are formed on one of the outer plates and are bent substantially at right angles thereto for reception in a first set of alignment slots in the outer insulators, the resistance elements, the inner insulators, the midplate and the other outer plate.
The slots in the resistance elements and the midplate are oversize clearance slots, while the slots in the insulators and the other outer plate are only slightly larger than the tabs on the first outer plate.
Each of the resistor elements is formed with a pair of additional alignment tabs which are sheared therefrom and are bent substantially perpendicular thereto, for reception in additional alignment slots formed in two of the insulators, preferably the outer insulators.
The alignment slots in the insulators are only slightly larger than the alignment tabs on the resistance elements so that alignment between the resistance elements and the insulators is inherently maintained when the resistance elements are assembled with the insulators
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Generators or Motors 
