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US 4,184,350 AGranted
High-production method and apparatus for making spiral convolution electrical heating coils
AssigneeSun Chemical Corporation
InventorLaurence G. Horwitt
Life of this patent
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AssigneeSun Chemical Corporation
InventorLaurence G. Horwitt
Estimating the term…
A high production method and apparatus which utilizes ribbon-like resistance wire to produce spiral wound electrical heating coils as used in cigar lighters, ignitor plugs and the like. Nesting of adjoining convolutions, if desired, can be effected by first imparting a transverse, ribbed configuration to the ribbon prior to the winding of the same into the spiral coil. In accomplishing this transverse configuring, cooperable male and female rolls, turning in opposite directions, form the ribbon and simultaneously cut it into lengths at a high production rate. After an annealing process, the cut strips of ribbon are fed to a coiling machine which has a notched arbor that receives end portions of the strips and coils the latter into a spiral shape while restraint is imposed on the strips. The feeding, confining, winding and ejection procedures involving the strips are automatically, sequentially carried out at a high production rate.
A high-production apparatus for making a spiral heating coil, comprising in combination:
A high-production method of making a spiral heating coil, which includes the steps of directing a foremost end portion of a cut length of ribbon of resistance wire stock to a location between relieved mouth portions of an opening in a holder, feeding said cut length of ribbon forwardly into said opening and into engagement with a stop, frictionally seizing the ribbon under yieldable spring action to yieldably hold the ribbon during such feeding of the same and engagement with said stop, shifting the stop out of engagement with the ribbon after such engagement has occurred, thereafter advancing the holder and ribbon toward a slitted arbor so as to insert the foremost end of the ribbon into the slit in the arbor, and then rotating the arbor while placing restraint on said ribbon, thereby to form the same into a spiral coil.
A high-production method of making a spiral heating coil of the type having nested convolutions, which includes the steps of passing a narrow, flat ribbon of resistance wire stock between a pair of counter-rotating, cooperable male and female rolls so as to impart a predetermined transverse configuration to the ribbon, directing a foremost end portion of a cut length of said ribbon to a location between relieved mouth portions of an opening in a holder, feeding said cut length of ribbon forwardly into said opening and into engagement with a stop, frictionally seizing the ribbon under yieldable spring action to yieldably hold the ribbon during such feeding of the same and engagement with said stop, shifting the stop out of engagement with the ribbon after such engagement has occurred, thereafter advancing the holder and ribbon toward a slitted arbor so as to insert the foremost end of the ribbon into the slit in the arbor, and then rotating the arbor while placing restraint on said ribbon, thereby to form the same into a spiral coil.
Dependencies are inferred from the claim text.