Patent US3675174A successfully refreshed from Google Patents.
US3675174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical coil and method of manufacturing same
Assignee: Electronic Associates Inc
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Filing: 1970-11-09
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Granted: 1972-07-04
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Expires: 1990-11-09
Abstract
Abstract An encapsulated printer coil having two bobbins on each one of which a coil is wound. The coil is wound from a single continuous wire and is wound such that the polarity on one bobbin is opposite from the polarity on the other bobbin. Coil winding to achieve this result occurs by placing the bobbins in axial alignment on a common mandrel and winding the wire in a single rotational direction on both bobbins. The bobbins are subjected to a two-step curing. When initially molded, the bobbins are partially cured to provide wall resilience during winding. They are finally cured during the final encapsulation step. The wire has an epoxy overcoat. Prior to encapsulation the wire is heated by having a current pass through it and pressure is exerted on the wire by having the coil compressed between two jaws. This provides a pre-encapsulation sizing and fixing of the wires. Mold gate positioning and dimensioning provide minimum winding disturbance during encapsulation.
Inventors
- 👤 Stephen Horbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:42
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/26; B41J9/38; H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/12; H01F41/127
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
217 words
A dual winding solenoid coil comprising: first and second bobbins, each of said bobbins having first and second flanges spaced from one another on a winding core to define a winding space therebetween, said bobbins being positioned adjacent to one another, a first flange of said first bobbin being substantially on the same plane as a first flange of said second bobbin, a second flange of said first bobbin being substantially on the same plane as a second flange of said second bobbin, a single continuous wire winding within said winding spaces of said bobbins, said wire being wound in a first rotational direction on a first one of said bobbins and being wound in a second rotational direction on a second one of said bobbins, whereby a pulse of current through said wire will provide a polarity in a first direction in said first one of said bobbins and in a second direction, opposite to said first direction, in said second one of said bobbins, and a start lead slot in each of said bobbins, said start lead slot being a groove along a winding space facing surface of said first flange of each of said bobbins, said groove in each of said bobbins extending from the position of the radially innermost turn of wire outward.
Claim 2
Dependent Claim
217 words
A dual winding solenoid coil comprising: first and second bobbins, each of said bobbins having first and second flanges spaced from one another on a winding core to define a winding space therebetween, said bobbins being positioned adjacent to one another, a first flange of said first bobbin being substantially on the same plane as a first flange of said second bobbin, a second flange of said first bobbin being substantially on the same plane as a second flange of said second bobbin, a single continuous wire winding within said winding spaces of said bobbins, said wire being wound in a first rotational direction on a first one of said bobbins and being wound in a second rotational direction on a second one of said bobbins, whereby a pulse of current through said wire will provide a polarity in a first direction in said first one of said bobbins and in a second direction, opposite to said first direction, in said second one of said bobbins, and a start lead slot in each of said bobbins, said start lead slot being a groove along a winding space facing surface of said first flange of each of said bobbins, said groove in each of said bobbins extending from the position of the radially innermost turn of wire outward.
Claim 3
Dependent Claim
59 words
The coil improvement of claim 1 further comprising: an outward extension of one of the edges of one of said first flanges of said first bobbin, and first and second terminals on said extension, a first end of said wire being connected to said first terminal and a second end of said wire being connected to said second terminal.
Claim 4
Dependent Claim
31 words
The coil improvement of claim 1 wherein: said first and second bobbins, including said flange extension and terminals, and said windings are encapsulated in a single homogeneous mineral filled thermo-setting material.
Claim 5
Dependent Claim
43 words
The coil improvement of claim 1 wherein: said second flange of each of said bobbins is thicker than said first flange of each of said bobbins, said flanges being thin walled flanges composed of an undercured glass fiber filled diallyl pthalate molding compound.
Claim 6
Dependent Claim
55 words
The coil improvement of claim 2 wherein: said second flange of each of said bobbins is thicker than said first flange of each of said bobbins, said flanges being thin walled flanges composed of an undercured glass fiber filled diallyl pthalate molding compound, said extension being thicker than said first flange of said first bobbin.
Claim 7
Dependent Claim
67 words
The coil improvement of claim 1 wherein: said start lead groove has a main axis that is parallel to a longitudinal plane bisecting the bobbin involved and which plane includes the main axis of the bobbin involved, said start lead groove being substantially on one side of said plane and positioned so that the first turn of wire will start at a position approximately at said plane.
Claim 8
Dependent Claim
67 words
The coil improvement of claim 2 wherein: said start lead groove has a main axis that is Parallel to a longitudinal plane bisecting the bobbin involved and which plane includes the main axis of the bobbin involved, said start lead groove being substantially on one side of said plane and positioned so that the first turn of wire will start at a position approximately at said plane.
Claim 9
Dependent Claim
67 words
The coil improvement of claim 3 wherein: said start lead groove has a main axis that is parallel to a longitudinal plane bisecting the bobbin involved and which plane includes the main axis of the bobbin involved, said start lead groove being substantially on one side of said plane and positioned so that the first turn of wire will start at a position approximately at said plane.
Claim 10
Dependent Claim
67 words
The coil improvement of claim 4 wherein: said start lead groove has a main axis that is parallel to a longitudinal plane bisecting the bobbin involved and which plane includes the main axis of the bobbin involved, said start lead groove being substantially on one side of said plane and positioned so that the first turn of wire will start at a position approximately at said plane.
Claim 11
Dependent Claim
67 words
The coil improvement of claim 5 wherein: said start lead groove has a main axis that is parallel to a longitudinal plane bisecting the bobbin involved and which plane includes the main axis of the bobbin involved, said start lead groove being substantially on one side of said plane and positioned so that the first turn of wire will start at a position approximately at said plane.
Claim 12
Independent Claim
139 words
The method of fabricating a dual bobbin, dual winding coil comprising the steps of: molding first and second bobbins, each bobbin having a winding core and spaced apart flanges at the end of said core to define a winding space therebetween, axially aligning said bobbins, using a single continuous wire, winding a first winding in a first rotational direction on a first one of said bobbins and then winding a second winding in said first rotational direction on said second one of said bobbins, maintaining a substantially constant tension on said wire during said step of winding, an rotating said bobbins relative to one another to cause said flanges of said first bobbin to align in a co-planar fashion with said flanges of said second bobbin and to cause said first and second windings to have opposite rotational orientations.
Claim 13
Independent Claim
139 words
The method of fabricating a dual bobbin, dual winding coil comprising the steps of: molding first and second bobbins, each bobbin having a winding core and spaced apart flanges at the end of said core to define a winding space therebetween, axially aligning said bobbins, using a single continuous wire, winding a first winding in a first rotational direction on a first one of said bobbins and then winding a second winding in said first rotational direction on said second one of said bobbins, maintaining a substantially constant tension on said wire during said step of winding, an rotating said bobbins relative to one another to cause said flanges of said first bobbin to align in a co-planar fashion with said flanges of said second bobbin and to cause said first and second windings to have opposite rotational orientations.
Claim 14
Dependent Claim
61 words
The fabricating method of claim 11 further comprising the steps of: selecting a thermo-setting material having good heat conductivity properties as the material from which said bobbins are molded during said step of molding, and undercuring said bobbins during said step of molding so that said flanges are less brittle than would be the case if the bobbins were fully cured.
Claim 15
Dependent Claim
107 words
The fabricating method of claim 11 further comprising the steps of: employing as said single continuous wire a wire having a partially cured epoxy overcoat, and applying heat and pressure to the windings of said bobbins when said bobbins are aligned with their flanges in said co-planar fashion, said pressure being applied transverse to front and back sides of said winding, said heat and pressure being sufficiently great to cause said undercured epoxy overcoat to further melt and cure to provide a fixing of the turns of said winding and a sizing of the width of said windings between said front and back surfaces of said windings.
Claim 16
Dependent Claim
107 words
The fabricating method of claim 12 further comprising the steps of: employing as said single continuous wire a wire having a partially cured epoxy overcoat, and applying heat and pressure to the windings of said bobbins when said bobbins are aligned with their flanges in said co-planar fashion, said pressure being applied transverse to front and back sides of said winding, said heat and pressure being sufficiently great to cause said undercured epoxy overcoat to further melt and cure to provide a fixing of the turns of said winding and a sizing of the width of said windings between said front and back surfaces of said windings.
Claim 17
Dependent Claim
92 words
The fabricating method of claim 13 further comprising the steps of: connecting the ends of said single continuous wire to terminals positioned on an extension of a flange of said first bobbin, and placing a pellet of molding compound over the lead wire from said second winding that is connected to one of said terminals to hold said lead wire against the front surface of said first winding, pellet being subjected to said heat and pressure, whereby said pellet permanently holds said lead wire against said front surface of said first winding.
Claim 18
Dependent Claim
92 words
The fabricating method of claim 14 further comprising the steps of: connecting the ends of said single continuous wire to terminals positioned on an extension of a flange of said first bobbin, and placing a pellet of molding compound over the lead wire from said second winding that is connected to one of said terminals to hold said lead wire against the front surface of said first winding, pellet being subjected to said heat and pressure, whereby said pellet permanently holds said lead wire against said front surface of said first winding.
Claim 19
Dependent Claim
93 words
The fabricating method of claim 11 further comprising the step of: encapsulating said bobbins and windings when rotated to said co-planar flange alignment arrangement, said step of encapsulating including the step of introducing encapsulating material into the encapsulating mold in a balanced fashion by gating the encapsulating material into the mold cavity through two gates positioned at the mold corners closest to the end corners of one of said flanges, the opening of these gates being such that the encapsulating material flows equally along each of the two sides of the bobbin pair.
References Cited (Backward Citations)
US965062A
Cited
US3014164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |