US3963882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boron or graphite reinforced voice coil and manufacturing process
Assignee: ST CLAIR INTELLECTUAL PROPERTY CONSULTANTS Inc A CORP OF MI
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Filing: 1975-03-14
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Granted: 1976-06-15
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Expires: 1995-03-14
Abstract
Abstract An armature adapted for use in a voice coil or linear motor and having a conductor winding and at least one stiffening layer coaxial and coextensive with, either inside or outside, the conductor winding. The stiffening layer is formed of a multiplicity of turns of a high elastic modulus, non-magnetic fiber such as graphite. The fiber and conductor turns are all firmly bonded into a rigid, composite unitary cylinder by a substance such as epoxy impregnating the entire composite cylinder. In a preferred embodiment, the conductor turns are located between interior and exterior layers. In a preferred method for manufacturing such an armature, the composite cylinder is formed layer by layer on a rotating mandrel, impregnating each layer with epoxy resin premixed for self-hardening.
Inventors
- 👤 Raymond M. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:45
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H01; H01F; H01F5/00; H01F5/02; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
63 words
A cylindrically shaped voice coil armature having a conductor helically wound into a hollow, approximately cylindrical shape, a stiffening layer coextensive and coaxial with and snugly fitted to the conductor cylinder and formed of a multiplicity of turns of graphite fiber, and a matrix bonding each of the individual conductor and fiber turns all firmly to all other adjacent conductor and fiber turns.
Claim 2
Dependent Claim
63 words
A cylindrically shaped voice coil armature having a conductor helically wound into a hollow, approximately cylindrical shape, a stiffening layer coextensive and coaxial with and snugly fitted to the conductor cylinder and formed of a multiplicity of turns of graphite fiber, and a matrix bonding each of the individual conductor and fiber turns all firmly to all other adjacent conductor and fiber turns.
Claim 3
Dependent Claim
14 words
The article of claim 1, wherein the fiber layer is outside the conductor cylinder.
Claim 4
Dependent Claim
14 words
The article of claim 1, wherein the fiber layer is inside the conductor cylinder.
Claim 5
Dependent Claim
56 words
The article of claim 3, wherein the coil comprises a second fiber layer of substantially the same composition and shape as the first, and coextensive and coaxial with, and snugly fitting outside the conductor cylinder, and the adherent matrix further bonds the individual turns of the second layer to all other adjacent fiber and conductor turns.
Claim 6
Dependent Claim
20 words
The article of claim 4, wherein the adherent matrix comprises hardened epoxy-type resin completely impregnating the fiber and conductor turns.
Claim 7
Dependent Claim
70 words
A method of manufacturing the article of claim 1, comprising the steps of a. wrapping the fiber around a cylindrical mandrel having an outside diameter equal to the desired inside diameter of the coil; b. wrapping an insulated conductor around the cylinder; and c. impregnating all the turns of both fiber and conductor with a liquid which hardens to form an adherent bond to both the conductor and the fiber.
Claim 8
Dependent Claim
43 words
The method of claim 6, wherein the wrapping steps further comprises using a mandrel to which liquid epoxy-type resin glue pre-mixed for self-hardening does not adhere, and the turn-impregnating step further comprises impregnating the turns with an epoxy-type resin glue pre-mixed for self-hardening.
Claim 9
Dependent Claim
86 words
The method of claim 7 further comprising the steps of: a. first coating the surface of the mandrel with the epoxy type glue; then b. wrapping a first layer of the graphite fiber on the epoxy-type glue coated mandrel; then c. coating the first graphite fiber layer with epoxy-type glue; then d. wrapping the conductor on the epoxy-coated first graphite fiber layer; then e. coating the conductor layer with epoxy-type glue; and finally f. wrapping a second layer of graphite fiber on the epoxy-coated conductor layer.
Claim 10
Dependent Claim
29 words
The method of claim 6, wherein the fiber layer is wound first on the mandrel, with a preselected "handedness," and the conductor winding is wound with the opposite "handedness."
Claim 11
Dependent Claim
63 words
A cylindrically shaped voice coil armature having a conductor helically wound into a hollow, approximately cylindrical shape, a stiffening layer coextensive and coaxial with and snugly fitted to the conductor cylinder and formed of a multiplicity of turns of boron fiber, and a matrix bonding each of the individual conductor and fiber turns all firmly to all other adjacent conductor and fiber turns.
Claim 12
Dependent Claim
63 words
A cylindrically shaped voice coil armature having a conductor helically wound into a hollow, approximately cylindrical shape, a stiffening layer coextensive and coaxial with and snugly fitted to the conductor cylinder and formed of a multiplicity of turns of boron fiber, and a matrix bonding each of the individual conductor and fiber turns all firmly to all other adjacent conductor and fiber turns.
Claim 13
Dependent Claim
14 words
The article of claim 10, wherein the fiber layer is outside the conductor cylinder.
Claim 14
Dependent Claim
14 words
The article of claim 10, wherein the fiber layer is inside the conductor cylinder.
Claim 15
Dependent Claim
56 words
The article of claim 12, wherein the coil comprises a second fiber layer of substantially the same composition and shape as the first, and coextensive and coaxial with, and snugly fitting outside the conductor cylinder, and the adherent matrix further bonds the individual turns of the second layer to all other adjacent fiber and conductor turns.
Claim 16
Dependent Claim
20 words
The article of claim 13, wherein the adherent matrix comprises hardened epoxy-type resin completely impregnating the fiber and conductor turns.
Claim 17
Dependent Claim
70 words
A method of manufacturing the article of claim 10, comprising the steps of a. wrapping the fiber around a cylindrical mandrel having an outside diameter equal to the desired inside diameter of the coil; b. wrapping an insulated conductor around the cylinder; and c. impregnating all the turns of both fiber and conductor with a liquid which hardens to form an adherent bond to both the conductor and the fiber.
Claim 18
Dependent Claim
43 words
The method of claim 15, wherein the wrapping steps further comprises using a mandrel to which liquid epoxy-type resin glue pre-mixed for self-hardening does not adhere, and the turn-impregnating step further comprises impregnating the turns with an epoxy-type resin glue pre-mixed for self-hardening.
Claim 19
Dependent Claim
86 words
The method of claim 16 further comprising the steps of: a. first coating the surface of the mandrel with the epoxy type glue; then b. wrapping a first layer of the boron fiber on the epoxy-type glue coated material; then c. coating the first boron fiber layer with epoxy-type glue; then d. wrapping the conductor on the epoxy-coated first boron fiber layer; then e. coating the conductor layer with epoxy-type glue; and finally f. wrapping a second layer of boron fiber on the epoxy-coated conductor layer.
Claim 20
Dependent Claim
29 words
The method of claim 15, wherein the fiber layer is wound first on the mandrel, with a preselected "handedness," and the conductor winding is wound with the opposite "handedness."
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |