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US 4,222,023 AGranted
Electrical coil assembly
AssigneeLucas Industries Limited
InventorKeith J. W. Beech
Life of this patent
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AssigneeLucas Industries Limited
InventorKeith J. W. Beech
Estimating the term…
An electrical coil assembly comprises a rectangular annular coil and a dustproof cover therefor. The cover is formed of a folded blank of electrically insulating sheet material which has a rectangular annular portion with a rectangular aperture. A first pair of opposed flaps and a second pair of opposed flaps are integrally joined to the external periphery of the portion. Each flap has a first tongue portion which is passed through the aperture and a second tongue portion which overlies a respective side of the aperture in the coil. The width of each tongue portion is greater than the length of the respective side of the aperture in the coil. The width of each tongue portion is not greater than the length of the respective side of the apertures. This blank is easy to assemble into a cover and there is a reduced risk of tearing the flaps.
An electrical coil assembly comprising a substantially rectangular annular coil and a substantially dustproof cover therefor, said cover being formed of a folded blank of electrically insulating sheet material, said blank including a substantially rectangular annular portion and two pairs of mutually opposed flaps which are folded around respective sides of the aperture in the coil to seal the inner periphery thereof, wherein the flaps of both pairs are provided, in the unfolded blank, externally of the substantially rectangular annular portion whereby end portions of all of the flaps are disposed on the same side of the electrical coil assembly.
Dependencies are inferred from the claim text.