US3671714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heated blower motor for defrosting windows
Assignee: Motors Liquidation Co
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Filing: 1970-10-05
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Granted: 1972-06-20
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Expires: 1990-10-05
Abstract
Abstract An electric motor driven blower adapted to defrost an automobile window and having inlets and outlets in opposite ends of the motor casing to direct air through the interior of the motor past the motor armature. The air is warmed during passage by contact with a plurality of electrically isolated closed loops of conductive material mounted in circumferentially spaced, axially directed slots on the armature. Hysteresis heat losses are produced in the loops by the movement of the closed loops through the motor''s magnetic field. A fan and duct at one end of the motor direct the warmed air against the automobile window for defrosting.
Inventors
- 👤 Norman Charns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:17
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/0094; B; B60; B60H; B60H1/00; B60H1/00457; B60H1/00471; F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; H05B6/108; H05B6/109
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
274 words
A combination blower and electric motor for directing heated air against the inside surface of an automobile windshield for defrosting comprising: an electric motor with a rotatable shaft supported within a casing; an armature attached to said shaft for rotation together within said motor casing; means supported by said casing radially outward from said armature for producing a magnetic field which extends across said armature; means supported by said rotatable armature for conducting electric current whereby the interaction between said magnetic field and said electric current through said conductive means causes said armature and shaft to rotate within said casing; blower fan means attached to one end of said motor shaft for rotation therewith; air inlet openings and outlet openings in opposite ends of said motor casing; duct forming means attached to one end of said motor casing around said fan means and said outlet openings for causing air to flow from the automobile interior, through said inlet openings, past said armature and through said outlet openings into said blower means; said duct means supported adjacent the inside surface of an automobile window for directing air from said blower against the window; said armature having circumferentially spaced and axially directed slots therein; conductors in said slots insulated from said armature; means connecting the ends of the conductors in pairs of circumferentially spaced slots to form a plurality of separate conductive loops insulated from said armature and from each other; said loops being rotated by said armature through said magnetic field whereby electric current is induced in said loops to produce hysteresis heat loss which warms the air flowing between said inlet and outlet openings.
Claim 2
Dependent Claim
274 words
A combination blower and electric motor for directing heated air against the inside surface of an automobile windshield for defrosting comprising: an electric motor with a rotatable shaft supported within a casing; an armature attached to said shaft for rotation together within said motor casing; means supported by said casing radially outward from said armature for producing a magnetic field which extends across said armature; means supported by said rotatable armature for conducting electric current whereby the interaction between said magnetic field and said electric current through said conductive means causes said armature and shaft to rotate within said casing; blower fan means attached to one end of said motor shaft for rotation therewith; air inlet openings and outlet openings in opposite ends of said motor casing; duct forming means attached to one end of said motor casing around said fan means and said outlet openings for causing air to flow from the automobile interior, through said inlet openings, past said armature and through said outlet openings into said blower means; said duct means supported adjacent the inside surface of an automobile window for directing air from said blower against the window; said armature having circumferentially spaced and axially directed slots therein; conductors in said slots insulated from said armature; means connecting the ends of the conductors in pairs of circumferentially spaced slots to form a plurality of separate conductive loops insulated from said armature and from each other; said loops being rotated by said armature through said magnetic field whereby electric current is induced in said loops to produce hysteresis heat loss which warms the air flowing between said inlet and outlet openings.
Claim 3
Dependent Claim
272 words
A combiNation blower and electric motor for directing heated air against the inside surface of an automobile window for defrosting comprising: an electric motor with a rotatable shaft supported within a casing; an armature attached to said shaft for rotation together within said motor casing; means supported by said casing radially outward from said armature for producing a magnetic field which extends across said armature; conductive means supported by said rotatable armature for conducting electric current whereby the interaction between said magnetic field and said electric current through said conductive means causes said armature and shaft to rotate within said casing; blower fan means attached to one end of said motor shaft for rotation therewith; air inlet openings and outlet openings in opposite ends of said motor casing; duct forming means attached to one end of said motor casing around said fan means and said outlet openings for causing air to flow from the automobile interior, through said inlet openings, past said armature and through said outlet openings into said fan means; said duct means supported adjacent the inside surface of an automobile window for directing air from said blower against the window; said armature having circumferentially spaced and axially directed slots therein; separate loops of conductive material on said armature formed by wire wrapped through pairs of circumferentially spaced slots in said armature; said separate loops being insulated from said armature and from each other whereby when said loops are rotated with said armature through said magnetic field, rapidly alternating electric current is induced in said loops which produces hysteresis heat for warming air flowing between said inlet and outlet openings.
Claim 4
Dependent Claim
272 words
A combiNation blower and electric motor for directing heated air against the inside surface of an automobile window for defrosting comprising: an electric motor with a rotatable shaft supported within a casing; an armature attached to said shaft for rotation together within said motor casing; means supported by said casing radially outward from said armature for producing a magnetic field which extends across said armature; conductive means supported by said rotatable armature for conducting electric current whereby the interaction between said magnetic field and said electric current through said conductive means causes said armature and shaft to rotate within said casing; blower fan means attached to one end of said motor shaft for rotation therewith; air inlet openings and outlet openings in opposite ends of said motor casing; duct forming means attached to one end of said motor casing around said fan means and said outlet openings for causing air to flow from the automobile interior, through said inlet openings, past said armature and through said outlet openings into said fan means; said duct means supported adjacent the inside surface of an automobile window for directing air from said blower against the window; said armature having circumferentially spaced and axially directed slots therein; separate loops of conductive material on said armature formed by wire wrapped through pairs of circumferentially spaced slots in said armature; said separate loops being insulated from said armature and from each other whereby when said loops are rotated with said armature through said magnetic field, rapidly alternating electric current is induced in said loops which produces hysteresis heat for warming air flowing between said inlet and outlet openings.
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |