US4429844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable camber aircraft wing tip
Assignee: Boeing Co
•
Filing: 1982-09-29
•
Granted: 1984-02-07
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Expires: 2002-09-29
Abstract
Abstract A variable wing tip (18) for securing to a variable camber leading edge portion (12) of an aircraft wing (10). The wing tip has a normal fore and aft camber in an upper position and is adapted to have an increased camber curvature in a deflected down position. In the down position, the wing tip has a compound curvature, is shortened in the fore and aft direction ad is generally thickened in depth in a substantial portion of the wing tip. By operation of an actuator (96) in the leading edge (21), a multiple of generally parallel scissor plates (30,32) are pivoted apart. The plates extend in an inboard outboard direction and are spaced in the fore and aft direction. The scissor plates are pairs of upper and lower plates with respect to the upper and lower surface of the wing tip, the upper plates (30) being adapted to be pivotally secured inboard to a complementary outer portion of the wing leading edge to secure the upper portion of the wing tip thereto, and the lower plates (32) being pivotally and slidably secured inboard within the wing tip and being adapted to be secured to a complementary outer portion of the wing leading edge to secure the lower portion of the wing tip thereto. Each respective pair of upper and lower plates are pivotally secured together outboard (40) adjacent and outboard leading edge (42) of the wing tip. Respective upper and lower plates are adapted to be pivoted apart inwardly of and on the outboard pivots (40) when the camber is increased in the down position so as to increase the depth of and shorten the fore and aft direction of the wing tip. An elastomer (84) is bonded to the plates, permitting the plates to be pivoted apart. An elastomeric wing tip configuration (88), is secured to the wing leading edge and to a forwardly facing edge of the wing. The elastomeric configuration has the normal camber of the wing tip in the upper position and the increased camber and compound curvature of the wing tip in the deflected position. It forms continuous surfaces in the varied camber positions with the wing.
Inventors
- 👤 Stephen T. Brown
- 👤 Frank D. Statkus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:49
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/38; B64C3/44; B64C3/48
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
162 words
A variable wing tip adapted to be secured to a variable camber leading portion of an aircraft wing, said wing tip comprising; an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal fore and aft camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position being shortened in the fore and aft direction and being generally thickened in depth in a substantial portion thereof, and having a compound curvature, curving forwardly and outboardly downwardly; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return.
Claim 2
Dependent Claim
162 words
A variable wing tip adapted to be secured to a variable camber leading portion of an aircraft wing, said wing tip comprising; an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal fore and aft camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position being shortened in the fore and aft direction and being generally thickened in depth in a substantial portion thereof, and having a compound curvature, curving forwardly and outboardly downwardly; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return.
Claim 3
Dependent Claim
16 words
The invention according to claim 1 in which: said wing tip is generally triangular in plan.
Claim 4
Dependent Claim
32 words
The invention according to claim 1 in which: said wing tip has a leading edge which is adapted to be generally at an acute angle with the leading edge of the wing.
Claim 5
Dependent Claim
162 words
The invention according to claim 1 in which: said means include multiple, generally parallel scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being adapted to be pivotally secured inboard to the complementary outer portion of th wing leading edge to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being adapted to be secured to the complementary outer portion of the wing leading edge to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said wing tip leading edge being adapted to be generally at an acute angle with the leading edge of the wing.
Claim 6
Dependent Claim
45 words
The invention according to claim 4 in which: said respective pairs of upper and lower plates being adapted to be pivoted apart inwardly of and on said outboard pivots when the camber is increased to the down position, increasing the depth of the wing tip.
Claim 7
Dependent Claim
65 words
The invention according to claim 5 in which: an elastomer is bonded to portions of the plates, permitting the plates to be pivoted apart; said upper and lower plates having respective upper, lower, and outboard end surfaces generally forming a wing tip configuration; said elastomer being bonded to said respective upper, lower, and outboard end surfaces of said plates to form portions of said configuration.
Claim 8
Dependent Claim
96 words
The invention according to claim 6 including: an elastomeric wing tip outer surface formed as the outer surface portion of said configuration including said elastomer; said outer surface portion being adapted to be secured to said wing leading edge portion and to said forwardly facing edge of the wing; said outer surface portion having the normal camber of the wing tip in the upper position and having the increased camber curvature of the wing tip in the deflected position; the outer surface portion and wing being adapted to form continuous surfaces in the varied camber positions.
Claim 9
Dependent Claim
38 words
The invention according to claim 7 in which: said elastomer is bonded to said plates with the wing tip in a partially deflected position to minimize any waviness in the lower surface of the wing tip during deflection.
Claim 10
Dependent Claim
155 words
In an aircraft wing, a variable camber wing tip forming an outboard and forward portion of said wing, said wing tip comprising: an inboard generally fore and aft extending end of the wing tip being secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the wing tip extending along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber on its upper surface in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position having a compound curvature between the upper cambered surface and its lower surface, the wing tip being curved downwardly forwardly and outboardly in the down position; and means within the wing tip adapted to be actuated to vary the camber from the upper portion to the down position and return.
Claim 11
Dependent Claim
155 words
In an aircraft wing, a variable camber wing tip forming an outboard and forward portion of said wing, said wing tip comprising: an inboard generally fore and aft extending end of the wing tip being secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the wing tip extending along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber on its upper surface in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position having a compound curvature between the upper cambered surface and its lower surface, the wing tip being curved downwardly forwardly and outboardly in the down position; and means within the wing tip adapted to be actuated to vary the camber from the upper portion to the down position and return.
Claim 12
Dependent Claim
16 words
The invention according to claim 9 in which: said wing tip is generally triangular in plan.
Claim 13
Dependent Claim
29 words
The invention according to claim 9 in which: said wing tip has a leading edge which is generally at an acute angle with the leading edge of the wing.
Claim 14
Dependent Claim
41 words
The invention according to claim 9 in which: said means, when actuated to vary and increase the camber to the down position, generally increases the depth of the wing tip and shortens the wing tip in the fore and aft direction.
Claim 15
Dependent Claim
154 words
The invention according to claim 9 in which: said means include multiple, generally parallel and generally vertical scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being pivotally secured inboard to the complementary outer portion of the wing leading edge to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being secured to the complementary outer portion of the wing leading edge to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said leading edge being generally at an acute angle with the leading edge of the wing.
Claim 16
Dependent Claim
45 words
The invention according to claim 13 in which: said respective pairs of upper and lower plates being adapted to be pivoted apart inwardly of and on said outboard pivots when the camber is increased to the down position, increasing the depth of the wing tip.
Claim 17
Dependent Claim
65 words
The invention according to claim 14 in which: an elastomer is bonded to portions of the plates, permitting the plates to be pivoted apart; said upper and lower plates having respective upper, lower, and outboard end surfaces generally forming a wing tip configuration; said elastomer being bonded to said respective upper, lower, and outboard end surfaces of said plates to form portions of said configuration.
Claim 18
Dependent Claim
69 words
The invention according to claim 15 including: an elastomeric wing tip outer surface formed as the outer surface portion of said configuration including said elastomer; said outer surface portion having the normal camber of the wing tip in the upper position and having the increased camber curvature of the wing tip in the deflected position; the outer surface portion and wing forming continuous surfaces in the varied camber positions.
Claim 19
Dependent Claim
38 words
The invention according to claim 16 in which: said elastomer is bonded to said plates with the wing tip in a partially deflected position to minimize any waviness in the lower surface of the wing tip during deflection.
Claim 20
Dependent Claim
142 words
A variable camber wing tip being adapted to be secured to an outboard and forward portion of an aircraft wing, comprising: an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return; said means, when actuated to vary and increase the camber to the down position, curve the wing tip downwardly forwardly and outboardly to have a compound curvature.
Claim 21
Dependent Claim
142 words
A variable camber wing tip being adapted to be secured to an outboard and forward portion of an aircraft wing, comprising: an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return; said means, when actuated to vary and increase the camber to the down position, curve the wing tip downwardly forwardly and outboardly to have a compound curvature.
Claim 22
Dependent Claim
156 words
The invention according to claim 18 in which: said means include multiple, generally parallel scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being adapted to be pivotally secured inboard to the complementary outer portion of the wing to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being adapted to be secured to the complementary outer portion of the wing to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said leading edge being adapted to be generally at an acute angle with the leading edge of the wing.
Claim 23
Dependent Claim
47 words
The invention according to claim 19 in which: said respective pairs of upper and lower plates being adapted to be pivoted apart inwardly of and on said outboard pivots when the camber is increased to the down position, whereby the depth of the wing tip is increased.
Claim 24
Dependent Claim
65 words
The invention according to claim 20 in which: an elastomer is bonded to portions of the plates, permitting the plates to be pivoted apart; said upper and lower plates having respective upper, lower, and outboard end surfaces generally forming a wing tip configuration; said elastomer being bonded to said respective upper, lower, and outboard end surfaces of said plates to form portions of said configuration.
Claim 25
Dependent Claim
73 words
The invention according to claim 21 including: an elastomeric wing tip outer surface portion formed as the outer surface portion of said configuration including said elastomer; said outer surface portion having the normal camber of the wing tip in the upper position and having the increased camber curvature of the wing tip in the deflected position; the outer surface portion and wing being adapted to form continuous surfaces in the varied camber positions.
Claim 26
Dependent Claim
38 words
The invention according to claim 22 in which: said elastomer is bonded to said plates with the wing tip in a partially deflected position to minimize any waviness in the lower surface of the wing tip during deflection.
Claim 27
Dependent Claim
306 words
A variable wing tip adapted to be secured to a variable camber leading portion of an aircraft wing, said wing tip comprising: an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal fore and aft camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position being shortened in the fore and aft direction and being generally thickened in depth in a substantial portion thereof; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return; said means including multiple, generally parallel scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being adapted to be pivotally secured inboard to the complementary outer portion of the wing leading edge to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being adapted to be secured to the complementary outer portion of the wing leading edge to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said wing tip leading edge being adapted to be generally at an acute angle with the leading edge of the wing.
Claim 28
Dependent Claim
306 words
A variable wing tip adapted to be secured to a variable camber leading portion of an aircraft wing, said wing tip comprising: an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal fore and aft camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position being shortened in the fore and aft direction and being generally thickened in depth in a substantial portion thereof; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return; said means including multiple, generally parallel scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being adapted to be pivotally secured inboard to the complementary outer portion of the wing leading edge to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being adapted to be secured to the complementary outer portion of the wing leading edge to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said wing tip leading edge being adapted to be generally at an acute angle with the leading edge of the wing.
Claim 29
Dependent Claim
45 words
The invention according to claim 24 in which: said respective pairs of upper and lower plates being adapted to be pivoted apart inwardly of and on said outboard pivots when the camber is increased to the down position, increasing the depth of the wing tip.
Claim 30
Dependent Claim
65 words
The invention according to claim 25 in which: an elastomer is bonded to portions of the plates, permitting the plates to be pivoted apart; said upper and lower plates having respective upper, lower, and outboard end surfaces generally forming a wing tip configuration; said elastomer being bonded to said respective upper, lower, and outboard end surfaces of said plates to form portions of said configuration.
Claim 31
Dependent Claim
96 words
The invention according to claim 26, including: an elastomeric wing tip outer surface formed as the outer surface portion of said configuration including said elastomer; said outer surface portion being adapted to be secured to said wing leading edge portion and to said forwardly facing edge of the wing; said outer surface portion having the normal camber of the wing tip in the upper position and having the increased camber curvature of the wing tip in the deflected position; the outer surface portion and wing being adapted to form continuous surfaces in the varied camber positions.
Claim 32
Dependent Claim
38 words
The invention according to claim 27 in which: said elastomer is bonded to said plates with the wing tip in a partially deflected position to minimize any waviness in the lower surface of the wing tip during deflection.
Claim 33
Dependent Claim
288 words
In an aircraft wing, a variable camber wing tip forming an outboard and forward portion of said wing, said wing tip comprising: an inboard generally fore and aft extending end of the wing tip being secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the wing tip extending along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber on its upper surface in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position having a compound curvature between the upper cambered surface and its lower surface; and means with the wing tip adapted to be actuated to vary the camber from the upper portion to the down position and return; said means including multiple, generally parallel and generally vertical scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being pivotally secured inboard to the complementary outer portion of the wing leading edge to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being secured to the complementary outer portion of the wing leading edge to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said leading edge being generally at an acute angle with the leading edge of the wing.
Claim 34
Dependent Claim
288 words
In an aircraft wing, a variable camber wing tip forming an outboard and forward portion of said wing, said wing tip comprising: an inboard generally fore and aft extending end of the wing tip being secured along a complementary outer end of a variable camber leading edge portion of the wing; a trailing edge of the wing tip extending along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber on its upper surface in an upper position and being adapted to have an increased camber curvature in a deflected down position; said wing tip in the down position having a compound curvature between the upper cambered surface and its lower surface; and means with the wing tip adapted to be actuated to vary the camber from the upper portion to the down position and return; said means including multiple, generally parallel and generally vertical scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being pivotally secured inboard to the complementary outer portion of the wing leading edge to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being secured to the complementary outer portion of the wing leading edge to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said leading edge being generally at an acute angle with the leading edge of the wing.
Claim 35
Dependent Claim
45 words
The invention according to claim 29 in which: said respective pairs of upper and lower plates being adapted to be pivoted apart inwardly of and on said outboard pivots when the camber is increased to the down position, increasing the depth of the wing tip.
Claim 36
Dependent Claim
65 words
The invention according to claim 30 in which: an elastomer is bonded to portions of the plates, permitting the plates to be pivoted apart; said upper and lower plates having respective upper, lower, and outboard end surfaces generally forming a wing tip configuration; said elastomer being bonded to said respective upper, lower, and outboard end surfaces of said plates to form portions of said configuration.
Claim 37
Dependent Claim
69 words
The invention according to claim 31 including: an elastomeric wing tip outer surface formed as the outer surface portion of said configuration including said elastomer; said outer surface portion having the normal camber of the wing tip in the upper position and having the increased camber curvature of the wing tip in the deflected position; the outer surface portion and wing forming continuous surfaces in the varied camber positions.
Claim 38
Dependent Claim
38 words
The invention according to claim 32 in which: said elastomer is bonded to said plates with the wing tip in a partially deflected position to minimize any waviness in the lower surface of the wing tip during deflection.
Claim 39
Dependent Claim
289 words
A variable camber wing tip being adapted to be secured to an outboard and forward portion of an aircraft wing, comprising: an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return; said means, when actuated to vary and increase the camber to the down position, generally increases the depth of a substantial portion of the wing tip; said means including multiple, generally parallel scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being adapted to be pivotally secured inboard to the complementary outer portion of the wing to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being adapted to be secured to the complementary outer portion of the wing to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said leading edge being adapted to be generally at an acute angle with the leading edge of the wing.
Claim 40
Dependent Claim
289 words
A variable camber wing tip being adapted to be secured to an outboard and forward portion of an aircraft wing, comprising: an inboard generally fore and aft extending end of the wing tip being adapted to be secured along a complementary outer end of the wing; a trailing edge of the tip being adapted to extend along a fixed outboard forwardly facing edge of the wing; said wing tip having a normal camber in an upper position and being adapted to have an increased camber curvature in a deflected down position; and means within the wing tip adapted to be actuated to vary the camber from the upper position to the down position and return; said means, when actuated to vary and increase the camber to the down position, generally increases the depth of a substantial portion of the wing tip; said means including multiple, generally parallel scissor plates, extending in an inboard-outboard direction and spaced in the fore and aft direction; said scissor plates being pairs of upper and lower plates with respect to upper and lower surfaces of the wing tip, the upper plates being adapted to be pivotally secured inboard to the complementary outer portion of the wing to secure an upper portion of the wing tip thereto, the lower plates being pivotally and slidably secured inboard within the wing tip and being adapted to be secured to the complementary outer portion of the wing to secure a lower portion of the wing tip thereto; each respective pair of upper and lower plates being pivotally secured together outboard adjacent an outboard leading edge of the wing tip, said leading edge being adapted to be generally at an acute angle with the leading edge of the wing.
Claim 41
Dependent Claim
47 words
The invention according to claim 34 in which: said respective pairs of upper and lower plates being adapted to be pivoted apart inwardly of and on said outboard pivots when the camber is increased to the down position, whereby the depth of the wing tip is increased.
Claim 42
Dependent Claim
65 words
The invention according to claim 35 in which: an elastomer is bonded to portions of the plates, permitting the plates to be pivoted apart; said upper and lower plates having respective upper, lower, and outboard end surfaces generally forming a wing tip configuration; said elastomer being bonded to said respective upper, lower, and outboard end surfaces of said plates to form portions of said configuration.
Claim 43
Dependent Claim
73 words
The invention according to claim 36 including: an elastomeric wing tip outer surface portion formed as the outer surface portion of said configuration including said elastomer; said outer surface portion having the normal camber of the wing tip in the upper position and having the increased camber curvature of the wing tip in the deflected position; the outer surface portion and wing being adapted to form continuous surfaces in the varied camber positions.
Claim 44
Dependent Claim
38 words
The invention according to claim 37 in which: said elastomer is bonded to said plates with the wing tip in a partially deflected position to minimize any waviness in the lower surface of the wing tip during deflection.
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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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |