Patent US4568045A successfully refreshed from Google Patents.
US4568045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door operated linkage for support of retracted airplane landing gear
Assignee: Boeing Co
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Filing: 1983-08-17
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Granted: 1986-02-04
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Expires: 2003-08-17
Abstract
Abstract A shaped support beam is joined to and extends laterally across a landing gear door to provide support and to hold a retracted airplane landing gear in position when the landing gear door is closed. Pivotable linkage, extending between airplane structure and the shaped support beam, press against the landing gear to hold the gear in the retracted position with the door latched, and to be pressed against to move an unlatched door aside to permit extension of the landing gear into operating position.
Inventors
- 👤 John D. Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:56
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/02; B64C25/08; B64C25/10; B64C25/18; B64C25/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
129 words
An apparatus for interaction between an airplane landing gear and a landing gear door comprising: a support beam joined to and transversely extending along an airplane landing gear door, means for pivotally rotating the beam with door between door open and door closed and locked position, a support shoe mounted adjacent and end of the landing gear shock strut, a pair of bars pivotally mounted together at one end and having an opposite end of one bar pivotally mounted to airplane structure and an opposite end of the other bar pivotally mounted to the beam, and a wear plate mounted to the joined end of the two pivotable bars to contact the support shoe to lock the retracted landing gear in position when the landing gear door is closed.
Claim 2
Independent Claim
129 words
An apparatus for interaction between an airplane landing gear and a landing gear door comprising: a support beam joined to and transversely extending along an airplane landing gear door, means for pivotally rotating the beam with door between door open and door closed and locked position, a support shoe mounted adjacent and end of the landing gear shock strut, a pair of bars pivotally mounted together at one end and having an opposite end of one bar pivotally mounted to airplane structure and an opposite end of the other bar pivotally mounted to the beam, and a wear plate mounted to the joined end of the two pivotable bars to contact the support shoe to lock the retracted landing gear in position when the landing gear door is closed.
Claim 3
Dependent Claim
64 words
An apparatus as in claim 1 further comprising: the wear plate shaped to extend along the upper surface of the bar that joins to airplane structure to be pressed against by the support shoe to move the door aside and permit the landing gear to move to the operating position when the door is unlatched and the gear and door power actuators are off.
Claim 4
Dependent Claim
31 words
An apparatus as in claim 2 further comprising a stop located to be contacted by the support shoe to limit upward movement of the landing gear when in the retracted position.
Claim 5
Dependent Claim
42 words
An apparatus as in claim 2 further comprising the landing gear having a different angle of axis of rotation from an axis of rotation of the landing gear door, and the support beam having shaped lines as it extends across the door.
Claim 6
Independent Claim
118 words
An apparatus for controlling airplane landing gear and landing gear door interaction, with the apparatus comprising: an airplane landing gear door having a transverse support beam pivotally joined adjacent one end to airplane structure and means for latching to airplane structure adjacent the other end, a support shoe attached near the end of a shock strut of an airplane landing gear and located to be contacted and pressed upward when the landing gear is in a retracted position, cooperating pivotable linkage between airplane structure and support beam with the linkage located to press joined ends against the support shoe to lock the landing gear in place when the landing gear door is closed with the landing gear retracted.
Claim 7
Independent Claim
118 words
An apparatus for controlling airplane landing gear and landing gear door interaction, with the apparatus comprising: an airplane landing gear door having a transverse support beam pivotally joined adjacent one end to airplane structure and means for latching to airplane structure adjacent the other end, a support shoe attached near the end of a shock strut of an airplane landing gear and located to be contacted and pressed upward when the landing gear is in a retracted position, cooperating pivotable linkage between airplane structure and support beam with the linkage located to press joined ends against the support shoe to lock the landing gear in place when the landing gear door is closed with the landing gear retracted.
Claim 8
Dependent Claim
26 words
An apparatus for controlling airplane landing gear and landing gear door interaction as in claim 5 wherein the support beam extends transversely along a shaped line.
Claim 9
Independent Claim
125 words
A method of interacting between an airplane landing gear and an landing gear door for controlling stowage and release of the landing gear, with steps comprising: securing a support shoe to the landing gear, extending a reinforcing beam across a landing gear door, providing for door pivoting from airplane structure at one end of the beam and for latching to airplane structure at the other end of the beam, securing pivotable linkage between the airplane support structure and the reinforcing beam, and locating the linkage for pressing against the support shoe and holding the gear in the retracted position upon closing the door, and for being pressed against by the support shoe and for moving the door aside to open when the door is unlatched.
Claim 10
Independent Claim
125 words
A method of interacting between an airplane landing gear and an landing gear door for controlling stowage and release of the landing gear, with steps comprising: securing a support shoe to the landing gear, extending a reinforcing beam across a landing gear door, providing for door pivoting from airplane structure at one end of the beam and for latching to airplane structure at the other end of the beam, securing pivotable linkage between the airplane support structure and the reinforcing beam, and locating the linkage for pressing against the support shoe and holding the gear in the retracted position upon closing the door, and for being pressed against by the support shoe and for moving the door aside to open when the door is unlatched.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |