US4501398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beam balancer electro-impulse deicing systems
Assignee: Lockheed Martin Corp
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Filing: 1982-12-10
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Granted: 1985-02-26
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Expires: 2002-12-10
Abstract
Abstract Torsional movement of a blade mass balance element (64) in a helicopter blade brings about a twisting of the upper and lower skin surfaces (24) and (26) of the blade (60) to produce a torsional travelling deformation wave in the skin. Torsion of the mass balance element (64) is accomplished through electrical activation and interaction of an upper coil (63) and a lower coil (62). The lower coil (62) is attached to the balance bar (64) via a cantilevered lever (66) while the upper coil (63) is attached to the balance bar (64) at two spanwise locations via a beam structure (68). The coils (62, 63), when electrically activated, cause torsion to be introduced into the mass balance element (64).
Inventors
- 👤 Paul E. Sandorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:10
CPC Classifications
B; B64; B64D; B64D15/00; B64D15/16; B64D15/163
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
An electromagnetic pulse deicing system for deicing the surface skin of a blade, said blade including a nose portion formed by upper and lower surfaces terminating at a leading edge, said blade also including a mass balance element extending spanwise of said leading edge, comprising a nose-torquer mechanism secured to said mass balance element for imparting torsion to said mass balance element and twisting both said upper and lower surfaces to produce a torsional travelling deformation wave in said skin.
Claim 2
Dependent Claim
80 words
An electromagnetic pulse deicing system for deicing the surface skin of a blade, said blade including a nose portion formed by upper and lower surfaces terminating at a leading edge, said blade also including a mass balance element extending spanwise of said leading edge, comprising a nose-torquer mechanism secured to said mass balance element for imparting torsion to said mass balance element and twisting both said upper and lower surfaces to produce a torsional travelling deformation wave in said skin.
Claim 3
Dependent Claim
64 words
The electromagnetic pulse deicing system according to claim 1 wherein said nose-torquer mechanism includes a first pulse generating element secured to a cantilevered arm attached to said mass balance element at a first spanwise location, said deicing system further including means for activating said first pulse generating element, whereby upon activation of said first pulse generating element, said torsional travelling deformation wave is generated.
Claim 4
Dependent Claim
53 words
The electromagnetic pulse deicing system according to claim 2 further comprising a second pulse generating element in close proximity to said first pulse generating element and secured to a beam attached to said mass balance element at a second spanwise location, said first and second locations being different spanwise locations along said blade.
Claim 5
Dependent Claim
29 words
The electromagnetic pulse deicing system according to claim 3 wherein said beam is attached to said mass balance element at at least two different spanwise locations along said blade.
Claim 6
Dependent Claim
43 words
The electromagnetic pulse deicing system according to claim 3 wherein said cantilevered arm and said beam are arranged so as to rotate in opposite directions about the axis of said mass balance element upon activation of said first and second pulse generating elements.
Claim 7
Dependent Claim
43 words
The electromagnetic pulse deicing system according to claim 4 wherein said cantilevered arm and said beam are arranged so as to rotate in opposite directions about the axis of said mass balance element upon activation of said first and second pulse generating elements.
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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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |