Patent US3986253A successfully refreshed from Google Patents.
US3986253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulator for armature shafts and method of installation
Assignee: Clarcor Inc
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Filing: 1975-09-05
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Granted: 1976-10-19
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Expires: 1995-09-05
Abstract
Abstract Disclosure is made of a universally fitting electrical insulator for mounting between the armature shaft and the windings and laminations of an armature. The disclosure is also of a method for mounting the insulator in the armature. The insulator and method are particularly useful in the production of double insulated electrical hand tools.
Inventors
- 👤 Robert L. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:20
CPC Classifications
H; H01; H01B; H01B19/00; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/28; H02K1/30; H02K3/00; H02K3/32; B; B29; B29L; B29L2031/00; B29L2031/34; B29L2031/3412; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249981; Y10T428/249982; Y10T428/249984
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
70 words
A universal fitting electrical insulator for mounting between the armature shaft and the windings or laminations of an armature, which comprises; a tubular body laminate having two open ends and which comprises an outer layer of an electrical insulative polymeric material and an inner layer of a synthetic polymeric resin, unfoamed, foam forming, adhesive composition, said body together with said ends defining an empty chamber for receiving said armature shaft.
Claim 2
Dependent Claim
70 words
A universal fitting electrical insulator for mounting between the armature shaft and the windings or laminations of an armature, which comprises; a tubular body laminate having two open ends and which comprises an outer layer of an electrical insulative polymeric material and an inner layer of a synthetic polymeric resin, unfoamed, foam forming, adhesive composition, said body together with said ends defining an empty chamber for receiving said armature shaft.
Claim 3
Dependent Claim
12 words
The insulator of claim 1 wherein said outer layer is a polyamide.
Claim 4
Dependent Claim
24 words
The insulator of claim 1 wherein said outer layer is separated from said inner layer by an interposed non-porous, synthetic polymeric resin film ply.
Claim 5
Dependent Claim
24 words
The insulator of claim 1 wherein said inner layer is a mixture which comprises a polyester polyol, a blocked diisocyanate and a blowing agent.
Claim 6
Dependent Claim
16 words
The insulator of claim 4 wherein said blowing agent decomposes under heat to produce nitrogen gas.
Claim 7
Dependent Claim
19 words
The insulator of claim 1 having an additional outermost layer of a synthetic polymeric resin, foam forming, adhesive composition.
Claim 8
Dependent Claim
29 words
The insulator of claim 6 wherein said layers of adhesive compositions are separated from the outer layer of electrical insulative polymeric material interposed non-porous, synthetic polymeric resin film plies.
Claim 9
Independent Claim
81 words
A method of mounting a tubular electrical insulator on an armature shaft, which comprises; providing a tubular insulator having two open ends and which comprises an outer layer of an electrical insulating polymeric material and an inner layer of a synthetic polymeric resin, foam-forming, adhesive composition; inserting a portion of said armature shaft through the open ends of said insulator; and causing said foam-forming adhesive composition to foam; whereby said insulator becomes bonded to the inserted portion of said armature shaft.
Claim 10
Independent Claim
81 words
A method of mounting a tubular electrical insulator on an armature shaft, which comprises; providing a tubular insulator having two open ends and which comprises an outer layer of an electrical insulating polymeric material and an inner layer of a synthetic polymeric resin, foam-forming, adhesive composition; inserting a portion of said armature shaft through the open ends of said insulator; and causing said foam-forming adhesive composition to foam; whereby said insulator becomes bonded to the inserted portion of said armature shaft.
Claim 11
Dependent Claim
16 words
A method according to claim 8 wherein said causing is by heating the foam-forming adhesive composition.
Claim 12
Dependent Claim
25 words
A method according to claim 8 which additionally comprises a coating said shaft with a synthetic, polymeric resin foam-forming adhesive composition prior to said inserting.
Claim 13
Independent Claim
168 words
A method of mounting a tubular electrical insulator between the armature shaft and the windings and laminations of an armature, which comprises; providing an insulator tube having two open ends and which comprises an outer layer of an electrical insulating polymeric material and inner and outermost layers of a synthetic polymeric resin, foam-forming, adhesive composition; providing the windings and laminations of an armature, said windings and laminations defining a space for an armature shaft, said space having a diameter exceeding the outer diameter of said insulator tube; providing an armature shaft for assembly in said space, said shaft having a diameter less than the diameter of the inner diameter of said insulator tube; assemblying a portion of said shaft within the inner space defined by said insulator tube; assemblying said insulator tube within the space defined by said windings and laminations; and causing said foam-forming adhesive composition layers to foam; whereby said shaft, said insulator tube and said windings and laminations become a unitary, bonded together, armature component.
Claim 14
Independent Claim
168 words
A method of mounting a tubular electrical insulator between the armature shaft and the windings and laminations of an armature, which comprises; providing an insulator tube having two open ends and which comprises an outer layer of an electrical insulating polymeric material and inner and outermost layers of a synthetic polymeric resin, foam-forming, adhesive composition; providing the windings and laminations of an armature, said windings and laminations defining a space for an armature shaft, said space having a diameter exceeding the outer diameter of said insulator tube; providing an armature shaft for assembly in said space, said shaft having a diameter less than the diameter of the inner diameter of said insulator tube; assemblying a portion of said shaft within the inner space defined by said insulator tube; assemblying said insulator tube within the space defined by said windings and laminations; and causing said foam-forming adhesive composition layers to foam; whereby said shaft, said insulator tube and said windings and laminations become a unitary, bonded together, armature component.
Claim 15
Dependent Claim
15 words
A method according to claim 11 wherein said causing is by heating the foam-forming layers.
Claim 16
Dependent Claim
28 words
A method according to claim 11 which additionally comprises coating said shaft and said windings and laminations with a synthetic, polymeric resin foam-forming adhesive composition prior to assemblying.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |