US3669387A - Control device for aircraft undercarriages and trap-door housing closure - Google Patents

Control device for aircraft undercarriages and trap-door housing closure Download PDF

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US3669387A
US3669387A US50495A US3669387DA US3669387A US 3669387 A US3669387 A US 3669387A US 50495 A US50495 A US 50495A US 3669387D A US3669387D A US 3669387DA US 3669387 A US3669387 A US 3669387A
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outlet
distributor
undercarriage
trap
conduit
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US50495A
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Rene Lucien
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Messier SA
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Messier SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/02—Undercarriages
    • B64C25/08—Undercarriages non-fixed, e.g. jettisonable
    • B64C25/10—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like
    • B64C25/18—Operating mechanisms
    • B64C25/22—Operating mechanisms fluid

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  • ABSTRACT A control device for a retractable aircraft undercarriage and for the trap-door closing its housing, with their actuating and locking members and control members supplying them in mechano-hydraulic sequences from a general undercarriagelifling conduit and a general undercarriage-lowering conduit jack serves for actuating the trap-door, and a first slide-valve distributor and a second slide-valve distributor cooperate in supplying the jack.
  • a first kinematic coupling is controlled by the retracted position of the undercarriage and places the first slide-valve in a characteristic undercarriage-up position and in a non-characteristic position.
  • a second kinematic coupling is controlled by the down position of the undercarriage and places the second slide-valve in a characteristic position.
  • a mechano-hydraulic means connects, in the non-characteristic positions. the opening chamber of the trap-door jack to the highpressure supply, with hydraulic locking, and the closure chamber to the low-pressure supply.
  • the above-mentioned application relates to a control device for undercarriages and trap-doors with mechanohydraulic sequences, the said device utilizing a distributor which controls the supply to the trap-door jack, and which is actuated mechanically by the undercarriage.
  • the present invention has for its object devices giving the same safety and advantages, but applied to aircraft in which the mechanical actuation of the distributor by the undercarriage would involves a construction which is insufficiently reliable or too awkward because it extends over excessive distances, especially when the locking device for the undercarriage-up is distant from the point at which the undercarriage-down signal can be made.
  • a coupling by levers and crank-arms between these two points would then constitute a considerable mechanical system with its concomitant disadvantages due to flexibility and play with the risk in addition of false indications due to the effect of structural deformations between these two distant points.
  • the present invention has consequently for its object to eliminate these disadvantages and difficulties.
  • the present invention essentially provides two hydraulic distributors, together with of course their interconnections and various hydraulic connections which control together and in co-operation the supply to the trap-door jack, which are mechanically independent and which are mechanically actuated by the position of the undercarriage, one of these two distributors being actuated by the undercarriage-up position and the other by the undercarriage-down position.
  • the trap-door distributor actuated by the undercarriage-up position may be actuated either by the position of the undercarriage, that is to say up or not up, or by the corresponding locking, that is to say undercarriage both in the up position and locked in this position, or on the contrary in the up position not locked or in a position other than the up position.
  • the two trap-door distributors according to the invention ensure the two sequences ofoperation described in the above-mentioned application (which effected them by a single trap-door distributor, as already stated).
  • the second sequence, which takes place in the presence of the hydraulic order to lift the undercarriage supplies the jack in the opening direction when the undercarriage is locked in the down position, supplies it in the opening direction but with reduced power when the undercarriage is not locked, and supplies it in the closure direction when the undercarriage is locked in the retracted position.
  • the present invention provides a plurality of means in co-operation with the said two distributors for the trap-door jack.
  • the open trap-door controls the undercarriage distributor, the chamber of the trapdoor jack ensuring the opening of the trap-door is connected to the high-pressure and is locked hydraulically while the closure chamber is connected to the low-pressure.
  • the open trap-door is locked mechanically; this mechanical locking controls the undercarriage distributor while the opening chamber can be left under an undetermined pressure and the closure chamber is put to the return.
  • FIG. I diagrammatically shows the application of the present invention to a landing-gear with a leg and strut, shown in the down position;
  • FIGS. 2, 3 and 4 shows the operations of the trap-door distributors in the three positions of the undercarriage, for an embodiment of the present invention comprising spring valves forming a hydraulic locking device;
  • FIG. 5 shows a further embodiment comprising a nonretum valve to insure hydraulic locking
  • FIG. 6 shows a further embodiment comprising spring clapper valves and a mechanical locking for the open trapdoor
  • FIGS. 7, 8 and 9 show the operations in the three positions of the undercarriage of another embodiment of the invention, comprising a mechanical locking of the open trap-door and a particular dimensioning of the trap-doorjack.
  • undercan-iages comprising mainly a leg, a folding strut and a jack; it is specified that the invention can be applied to any landing gear with a retractable undercarriage.
  • an undercarriage shown in the down position, consisting of a leg I actuated by a jack 2 acting between the top of the leg 1 and a strut comprising a lower arm 3 and an upper arm 4, with a jack II for releasing the retracted undercarriage, and a trap-door 16 in the closed position, with its locking device in the closed position constituted by a hook I7 articulated on a shaft 21 and restored by a spring 18, a roller 19 articulated on a fixed shaft 191 and rigidly secured to a jack 20 comprising a piston 20] returned by a spring 202.
  • the device according to the invention mainly comprises a distributor l3 controlling the movements of the undercarriage (lowering conduit I01, lifting conduit 102, return conduit 103), and two distributors 312 and 412 controlling the move ments of the trap-door with the control members of these distributors.
  • these members are a cam I4 and a crank-arm 15 which connects the cam to the trap-door I6.
  • these members are a roller 61 and a cam 5 keyed on the arm 4 of the strut, and for the distributor 412 these members are the locking arm 9 of the hook 8.
  • the distributor 3l2 is actuated by the position of the undercarriage when it reaches or leaves its down position, and the distributor 412 is actuated by the locking of the undercarriage in the up position when this locking is efiected or released.
  • the distributor 312 has a slide-valve 313 provided with three grooves 314, 315 and 316. Its body is provided, on one side with two passages, which are the passage 318 connected to the lifting conduit 102, and the passage 319 connected to the lowering conduit 101, and on the other side with two passages, the passage 321 connected to the chamber 233 for opening the trap-door jack and the passage 322 connected to the closure chamber 232.
  • the slide-valve 313 In the position shown in FIG. 2 and having the reference 116, which corresponds to the undercarriage not down TNB, the slide-valve 313 is on the right.
  • the groove 314 couples together the passages 321 and 326 and the groove 316 joins together the passages 323 and 327.
  • the slide-valve 313 in the position shown in FIG.4, having the reference 117, which corresponds to the undercarriage down T8, the slide-valve 313 is on the left; the groove 314 connects together the passages 318 and 321, and the groove 315 connects together the passages 319 and 322.
  • the distributor 412 ha a slide-valve 413 provided with three grooves 414, 415 and 416. Its body is provided, on one side with two passages which are the passage 418 coupled to the lifting conduit 102 and the passage 419 connected to the lowering conduit and on the other side with two passages, which are the passage 421 coupled to the opening chamber 233 and the passage 422 connected to the closure chamber 232. it is also provided with a narrow passage 423 and with two clapper-valves 424 and 425 opening towards the passage 423, valve 424 controlling communication to the lifting conduit 102 and the valve 425 controlling communication to the lowering conduit 101, and with two narrow passages 426 and 427 connected respectively to the passages 326 and 327 of the distributor 312.
  • the slide-valve 413 In the position having the reference 112 in FlG.2, which corresponds to the undercarriage locked in the up position TVH, the slide-valve 413 is on the right; the groove 414 connects together the passages 418 and 422 and the groove 415 joins together the passages 419 and 421. [n the position shown in FIG. 3 and having the reference 114, which corresponds to the undercarriage up but not locked TNH, the slide-valve 413 is on the left; the groove 414 connects together the passages 422 and 427 and the groove 416 joins together the passages 423 and 426.
  • FIG. 2 also shows the main selector 26, which does not form part of the invention.
  • This manually operated selector effects in its two end positions, which constitute a hydraulic reversing device, the lifting (position reference 111) and the lowering (position reference 119), with an intermediate neutral posi- 11011.
  • the lifting conduit is fully connected to the closure chamber of the trap-door jack and the lowering conduit is fully connected to the opening chamber;
  • the slide-valve 413 of the distributor 412 ensures the putting into communication of the opening chamber 233 of the trap-doorjack 23 with the lowering circuit 101 and of the closure chamber 232 with the lifting circuit 102 through orifices of large size, permitting the passage of the flow-rate necessary for the actuation of the trap-door 16.
  • the opening or closure of the trap-door 16 is obtained depending on whether the main undercarriage selector 26 is on undercarriage-down (119) or undercarriage-up (111).
  • the slide-valve 313 in position 116) and the slidevalve 413 (in position 114) put into communication the opening chamber 233 of the jack 23 of the trap-door 16 through conduits and passages 326, 426, 423 of small size, with that of the two conduits for lowering 101 and lifting 102 which is under pressure, by means of the two non-retum clapper-valves 424 or 425, the function of which is on the one hand to prevent leakage between the high-pressure circuit and the return, and on the other hand to ensure the hydraulic locking of the trap-door in the open position, in order to provide against any risk of re-closure of the trap-door in the event of a drop in pressure in the lifting or lowering circuit during the movement of the undercarriage.
  • the closure chamber 232 of the jack 23 of the trap-door 16 is kept in communication by orifices and conduits of small size with that of the lifting and lowering conduits which is connected to the return, through the non-return valves 324 and 325, the purpose of which is to prevent leakage between the high-pres sure circuit and the return.
  • This connection of the closure chamber 232 to the return is necessary in order to prevent this chamber from being put under pressure by the effect of leakages from the distribution slide-valves, this pressure being liable to cause the closure of the trap-door and would effectively cause this in the event of a fluid-tightness failure of the clapper-valves 424 or 425.
  • this maintenance under pressure of the opening chamber and to the return of the closure chamber enables the trap-door to complete its opening movement in the case where, as shown in FIG. 1; the undercarriage distributor is actuated by the open trap-door position.
  • the undercarriage distributor is actuated before the trap-door has completed its opening movement.
  • the undercarriage becomes released at the top or when leaving the down position it causes the double trap-door distributor 312412 to be put into the "undercarriage in movement" position and it is necessary for this position to permit the trap door to complete its opening movement, especially in order to ensure the full opening of the undercarriage distributor 13 and to avoid wire-drawing of the flow for operating the undercarriage through this distributor.
  • FIG. 4 corresponds to the undercarriage-down position.
  • the slide-valve 313 of the distributor 312 in the position 117 effects communication between the opening chamber 233 of the jack 23 of the trap-door 16 with the lifting circuit 102, and of the closure chamber 232 with the lowering circuit 191 through orifices of large size permitting the passage of the flow-rate necessary for the operation of the trap-door.
  • Opening or closure of the trap-door is thus obtained depending on whether the main undercarriage selector is on the undercarriage-up or undercarriage-down position.
  • the slide-valve 313 is controlled by the position of the undercarriage (down or not down) and the slide valve 413 is controlled by the locking of the undercarriage-up (locked or not locked). If the arrangement of the undercarriage permits this, it is possible to control the distributor 312 by the down locking, without this changing in any way the principle of the operation or the arrangement of the distributors described above. Similarly, it is possible to control the distributor 412 by the undercarriage-up position. In principle it is preferable to control the distributors by the locking whenever this is possible, each operation only being effected when the preceding operation is completely ended.
  • FIG. 5 shows the intermediate position (as in FIG. 3 There can be seen two distributors 512 and 612 which correspond to the distributors 312 and 412 with the elimination of the spring valves 324, 325, 424, 425; the passage 523 is directly connected to a return conduit 103, and the passage 623 is connected to a pressure intake conduit 104 through a non-return valve 27.
  • the rod 231 is provided with a dog 234 which can be locked on a shoulder 235 arranged inside the cylinder of the jack 23 by an auxiliary piston 236 under the action of a spring 237, in the absence of pressure at 232.
  • the undercarriage distributor is controlled by this open trapdoor locking (as already stated), it is not necessary to maintain the pressure in the opening chamber of the trap-door jack during the operation of the undercarriage, but it is necessary to keep the closure chamber on the return in order to avoid any accidental release caused by this chamber being put under pressure, due to leakages of the slide-valve.
  • distributor 712 which corresponds to that described with reference to FIG. 2 (except that the passage 326 is eliminated), and on the other hand, a distributor 712 which does not comprise any pressure-holding device.
  • the slide-valve 713 of distributor 712 is provided with two grooves 714 and 715. Its body is provided, on the one side with two passages which are the passage 718 connected to the lifting conduit 102 and the passage 719 connected to the lowering conduit 101, and on the other side with two passages, which are the passage 721 connected to the opening chamber 233 and the passage 722 connected to the closure chamber 232. It is further provided with a narrow passage 727 joined to the passage 327 of the distributor 312.
  • the grooves 714 and 715 have the same function as the grooves 414 already described.
  • the present invention also relates to a further construction of the trap-door distributors, in which only the closure chamber of the trap-door jack is subjected alternately to the return and under pressure during the operation of the undercarriages, the opening chamber remaining constantly under pressure.
  • This arrangement leads to slide-valves having simpler sequences, at the cost however of complication at the level of the undercarriage-up, undercarriage-down selector. The choice between this solution and that described above depends on the particular constructional configurations of each aircraft.
  • the distributor 812 has a slide-valve 813 provided with a groove 814. its body is provided on one side with a passage 818 connected to the lowering conduit 101, and on the other side with a passage 822 connected to the closure chamber 232. it is furthermore provided with a narrow passage 827 connected to the distributor 912.
  • the slide-valve 813 in the position shown in FIG. 7 and having the reference 116, which corresponds to the undercarriage not down TNB, the slide-valve 813 is on the right; the groove 814 joins together the passages 822 and 827.
  • the slide-valve 813 In the position shown in FIG. 9 and having the reference 117, which corresponds to the undercarriage-down TB, the slide-valve 813 is on the left; the groove 814joins together the passages 818 and 822.
  • the distributor 912 has its slide-valve 913 provided with two grooves 914 and 915.
  • the slide-valve 913 In the position shown in FIG. 7 and having the reference 112 which corresponds to the undercarriage-up locked TVH, the slide-valve 913 is on the right; the groove 915 connects together the passages 922 and 919. In the position shown in FIG. 8 with the reference 114, which corresponds to the undercarriage-up not locked position TNH, the slide-valve 913 is on the left; the groove 914 joins together the passages 927 and 918.
  • the opening chamber 233 of the jack 23 of the trapdoor 16 is put under pressure as soon as the pilot effects a lifting or lowering operation, for example by means of a distributor 28, associated or incorporated with the main selector 26 undercarriage-up (position reference 111] undercarriage-down (position reference 119), as shown in FIGS. 7 to 9.
  • the arrangement of the slide-valves 813 and 913 of the distributors in FIG. 7 corresponds to the position undercarriageup locked.
  • the slide-valve 913 of the distributor 912 ensures the putting into communication of the closure chamber 232 of the trap-door jack with the lifting circuit, permitting free evacuation of the liquid towards the return and therefore the opening of the trap-door 16 when the main selector 26 is on the undercarriage-down position 119, and the closure of the trap-door 16 by the effect of the lifting pressure when the pilot control is on the undercarriage-up position 11 1.
  • FIG. 8 shows the intermediate condition between the undercarriage-up locked position and the undercarriage-down position, that is to say the condition encountered during the undercarriage operations.
  • the closure chamber 232 of the trap-door jack is maintained on the return 103 by orifices 827, 927 and a conduit of small size through the distributors 812 and 912, preventing an increase of pressure in this chamber 232 due to leakages in the slide-valve, which would cause the re-closing of the trap-door.
  • FIG. 9 shows the undercarriage-down position, in which the slide-valve 813 ensures the putting into communication of the closure chamber 232 with the lowering circuit 101, permitting free circulation of the liquid towards the return 103, and therefore the opening of the trap-door 16 when the main selector is in the undercarriage-up position 111, and the closure of the trap-door by the effect of the lowering pressure when the main selector is in the undercarriage-down position 1 l9.
  • return conduit 103 terminating at the distributor 912 may be replaced by the clapper-valve system 324, 325 shown on the distributor 3l2 of FIG. 2.
  • the pressure is continuously maintained in the opening chamber 233 of the jack 23 of the trap-door l6 and therefore when the latter is open, but since the liquid circulates in both directions in the conduit supplying the opening chamber 233, it is not possible to ensure hydraulic locking by a simple non-return clapper-valve.
  • This construction is thus preferably applied to a system comprising a mechanical locking of the trap-door in the open position, for example by a lock with a dog 234 inside the jack 23 as shown in FIGS. 8 and 9, but it is not necessary for the undercarriage distributor to be controlled by the trapdoor lock since the pressure is maintained in the opening chamber 233.
  • This construction can also be applied to a device without mechanical locking of the open door by ensuring hydraulic locking by means of a non-return clapper-valve having its opening actuated by the re-closure pressure, this being a conventional solution in hydraulic circuits.
  • the trap-door opening chamber is kept in communication with the high-pressure circuit and furthermore is hydraulically locked, the trap-door closure chamber is maintained in communication with the low-pressure circuit in order to ensure the end of the opening movement of the trap-door and the full opening of the undercarriage distributor, and the maintenance of the trap-door in the open position in spite of external actions and fluctuations of pressure in the high and lowpressure circuits of the undercarriages during their operation (FIG. 2 to 4 with the alternative of FIG. 5).
  • said control device comprising a jack connected for actuating said trap-door and having opening and closing chambers, a first slide-valve distributor and a second slidevalve distributor cooperating to supply said jack, a first kinematic coupling controlled by the up position of the undercarriage and placing said first slide-valve in a characteristic undercarriage-up position and in a non-characteristic position, a second kinematic coupling controlled by the down position of the undercarriage and placing said second slide-valve in a characteristic undercarriage-down position and in a
  • said undercarriage comprises a locking device in the up position, said first kinematic coupling being controlled by said locking device.
  • each of said two distributors is provided with four outlets and with a passage, each of said two distributors in its characteristic position connecting the lifting conduit to a first outlet and the lowering conduit to a second outlet, and in its non-characteristic position connecting said first outlet to a third outlet and a fourth outlet to said passage, said first outlet of the first distributor being connected to said second outlet of said second distributor and to the closure chamber of the trap-door jack, said second outlet of the first distributor being connected to the first outlet of the second distributor and to the opening chamber of the trap-door jack, the third outlet of each distributor being connected to the fourth outlet of the other distributor, and said mechano-hydraulic means comprising, on the one hand in said first distributor, two spring clapper-valves supplying its passage, one from the lifting conduit and the other from the lowering conduit, and on the other hand in said second distributor, two spring clapper-valves, one supplying the lifting conduit and the other the lowering conduit from the passage of said distributor.
  • each of said two distributors is provided with five outlets, each of said two distributors in its characteristic position connecting the lifting conduit to a first outlet and the lowering conduit to a second outlet, and in its non-characteristic position, connecting 133 first outlet to a third outlet and a fourth outlet to a fifth outlet, said first outlet of said first distributor being connected to said second outlet of said second distributor and to the closure chamber of the trap-door jack, said second outlet of the first distributor being connected to the first outlet of the second distributor and to the opening chamber of the trap-door jack, the third outlet of each distributor being connected to the fourth outlet of other other distributor, and said mechanohydraulic means comprising, on the one hand a non-return valve supplied by a conduit under pressure and supplying the fifth outlet of said first distributor, and on the other hand a direct connection between the fifth outlet of said second distributor and a return conduit.
  • each of said two distributors is provided with three outlets, said first distributor in its characteristic position (undercarriage-up) connecting the lifting conduit to a first outlet and the lowering conduit to a second outlet, and in its non-characteristic position (undercarriage not up) connecting said first outlet to a third outlet, said second distributor in its characteristic position (undercarriage-down) connecting the lifting conduit to a first outlet and the lowering conduit to a second outlet, and in its noncharacteristic position (undercarriage not down) connecting a third outlet to a passage, the first outlet of the first distributor being connected to the second outlet and to the closure chamber of the trap-door jack, the second outlet of the first distributor being connected to the first outlet of the second distributor and to the opening chamber of said trap-door jack, the third outlets of the two distributors being connected together, and said mechano-hydraulic means comprising on the one hand in said second distributor, two spring valves, one supplying the lifting conduit and the other the lowering conduit from the passage of
  • each of said two distributors is provided with two outlets, said first distributor in its characteristic position connecting the lifting conduit to a first outlet, and in its non-characteristic position (undercarriage not up) connecting a second outlet to the return conduit, said second distributor in its characteristic position (undercarriage-down) connecting the lowering conduit to a first outlet, and in its non-characteristic position (undercarriage not down) connecting said first outlet to a second outlet, said first outlets being connected together and to the closure chamber of the trap-door jack, said second outlets being connected together, and mechano-hydraulic said means comprising a distributor coupled to the main undercarriage control selector and supplying under pressure during each operation, the opening chamber of the trap-door jack, said trap-door jaclt having a rod provided, in the closure chamber, with a dog adapted to lock in the open trap-door position, on a shoulder by means of an auxiliary piston under the action of a spring, in the absence of pressure in the closure chamber.
US50495A 1969-06-27 1970-06-29 Control device for aircraft undercarriages and trap-door housing closure Expired - Lifetime US3669387A (en)

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FR696921852A FR2061559B2 (ru) 1969-06-27 1969-06-27

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CA (1) CA927361A (ru)
DE (1) DE2031415C2 (ru)
FR (1) FR2061559B2 (ru)
GB (1) GB1320011A (ru)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300468A (en) * 1980-03-24 1981-11-17 The United States Of America As Represented By The Secretary Of The Navy Position interlock system for submarine masts and closure
US5288037A (en) * 1992-02-03 1994-02-22 Messier-Bugatti Catch device for locking aircraft landing gear in the raised position
EP0934874A3 (en) * 1998-02-06 1999-10-27 Normalair-Garrett (Holdings) Limited Aircraft undercarriage door latching assembly
EP1044876A1 (en) * 1998-02-17 2000-10-18 Triumph Controls, Inc. An aircraft landing gear manual release assembly
US20030164421A1 (en) * 2002-03-04 2003-09-04 Messier-Bugatti Latch device, in particular for latching an airplane landing gear or an airplane landing gear hatch
US20030164422A1 (en) * 2002-03-04 2003-09-04 Messier-Hispano-Bugatti Latch device, in particular for latching an airplane landing gear or an airplane landing gear hatch, and a method of operating said device
US20040183454A1 (en) * 2002-06-21 2004-09-23 Krichtafovitch Igor A. Method of and apparatus for electrostatic fluid acceleration control of a fluid flow
US6854689B1 (en) * 2004-02-09 2005-02-15 The Boeing Company Methods and systems for operating aircraft landing gears
US20080277525A1 (en) * 2006-03-22 2008-11-13 Airbus France Hydraulic distributor for airplane landing gear
WO2010063109A1 (en) * 2008-12-05 2010-06-10 Messier-Dowty Inc. Landing gear bay door with roller slot mechanism
US20100140395A1 (en) * 2008-12-05 2010-06-10 Messier-Dowty Inc. Double hook door mechanism
US20120097792A1 (en) * 2010-10-20 2012-04-26 Messier-Bugatti-Dowty Hydraulic circuit for actuating an undercarriage, and methods of deploying and raising an undercarriage using such a circuit
US20130193696A1 (en) * 2012-02-01 2013-08-01 Babcock & Wilcox Technical Services Y-12, Llc Delayed unlatching mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552843A (en) * 1948-08-23 1951-05-15 Northrop Aircraft Inc Sequence control for landing gears
US2701695A (en) * 1949-08-18 1955-02-08 Mcdonnell Aircraft Corp Hydraulic interlock for retractable landing gear and closure operators for the chambers therefor
US3107886A (en) * 1961-11-09 1963-10-22 Kaman Aircraft Corp Hydraulic system for aircraft landing gear and hydraulic actuator therefor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR965855A (ru) * 1950-09-23
DE740329C (de) * 1939-03-21 1943-10-22 Messerschmitt Boelkow Blohm Hydraulische Verstelleinrichtung fuer aus einem Innenraum des Flugzeuges ausfahrbare Fahrwerke o. dgl. und fuer Abdeckklappen der Durchgangsoeffnungen
US2452787A (en) * 1948-01-02 1948-11-02 North American Aviation Inc Landing gear system
FR2036686B1 (ru) * 1969-01-31 1974-02-22 Messier Hispano Sa

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552843A (en) * 1948-08-23 1951-05-15 Northrop Aircraft Inc Sequence control for landing gears
US2701695A (en) * 1949-08-18 1955-02-08 Mcdonnell Aircraft Corp Hydraulic interlock for retractable landing gear and closure operators for the chambers therefor
US3107886A (en) * 1961-11-09 1963-10-22 Kaman Aircraft Corp Hydraulic system for aircraft landing gear and hydraulic actuator therefor

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300468A (en) * 1980-03-24 1981-11-17 The United States Of America As Represented By The Secretary Of The Navy Position interlock system for submarine masts and closure
US5288037A (en) * 1992-02-03 1994-02-22 Messier-Bugatti Catch device for locking aircraft landing gear in the raised position
EP0934874A3 (en) * 1998-02-06 1999-10-27 Normalair-Garrett (Holdings) Limited Aircraft undercarriage door latching assembly
US6168113B1 (en) 1998-02-06 2001-01-02 Normalair-Garrett (Holdings) Limited Uplock assembly
EP1044876A1 (en) * 1998-02-17 2000-10-18 Triumph Controls, Inc. An aircraft landing gear manual release assembly
US20030164421A1 (en) * 2002-03-04 2003-09-04 Messier-Bugatti Latch device, in particular for latching an airplane landing gear or an airplane landing gear hatch
US20030164422A1 (en) * 2002-03-04 2003-09-04 Messier-Hispano-Bugatti Latch device, in particular for latching an airplane landing gear or an airplane landing gear hatch, and a method of operating said device
US6802476B2 (en) * 2002-03-04 2004-10-12 Messier-Bugatti Latch device, in particular for latching an airplane landing gear or an airplane landing gear hatch, and a method of operating said device
US6811118B2 (en) * 2002-03-04 2004-11-02 Messier-Bugatti Latch device, in particular for latching an airplane landing gear or an airplane landing gear hatch
US20040183454A1 (en) * 2002-06-21 2004-09-23 Krichtafovitch Igor A. Method of and apparatus for electrostatic fluid acceleration control of a fluid flow
US20080308672A1 (en) * 2004-02-09 2008-12-18 Lindahl Gary M Methods and systems for operating aircraft landing gears
US20060027706A1 (en) * 2004-02-09 2006-02-09 Lindahl Gary M Methods and systems for operating aircraft landing gears
US7093795B2 (en) 2004-02-09 2006-08-22 The Boeing Company Methods and systems for operating aircraft landing gears
US6854689B1 (en) * 2004-02-09 2005-02-15 The Boeing Company Methods and systems for operating aircraft landing gears
US7475849B2 (en) 2004-02-09 2009-01-13 The Boeing Company Methods and systems for operating aircraft landing gears
US20080277525A1 (en) * 2006-03-22 2008-11-13 Airbus France Hydraulic distributor for airplane landing gear
US7810755B2 (en) * 2006-03-22 2010-10-12 Airbus France Hydraulic distributor for airplane landing gear
WO2010063110A1 (en) * 2008-12-05 2010-06-10 Messier-Dowty Inc. Landing gear bay door with double hook mechanism
US20100140394A1 (en) * 2008-12-05 2010-06-10 Messier-Dowty Inc. Roller slot door mechanism
US20100140395A1 (en) * 2008-12-05 2010-06-10 Messier-Dowty Inc. Double hook door mechanism
WO2010063109A1 (en) * 2008-12-05 2010-06-10 Messier-Dowty Inc. Landing gear bay door with roller slot mechanism
CN102232038A (zh) * 2008-12-05 2011-11-02 梅西埃-道蒂公司 滚轴插槽式门机构
US8231078B2 (en) 2008-12-05 2012-07-31 Messier-Dowty Inc Double hook door mechanism
US8267351B2 (en) 2008-12-05 2012-09-18 Messier-Dowty Inc. Roller slot door mechanism
US8453965B2 (en) 2008-12-05 2013-06-04 Messier-Dowty Inc. Double hook door mechanism
CN102232038B (zh) * 2008-12-05 2013-11-27 梅西埃-道蒂公司 滚轴插槽式门机构
US20120097792A1 (en) * 2010-10-20 2012-04-26 Messier-Bugatti-Dowty Hydraulic circuit for actuating an undercarriage, and methods of deploying and raising an undercarriage using such a circuit
US8616495B2 (en) * 2010-10-20 2013-12-31 Messier-Bugatti-Dowty Hydraulic circuit for actuating an undercarriage, and methods of deploying and raising an undercarriage using such a circuit
US20130193696A1 (en) * 2012-02-01 2013-08-01 Babcock & Wilcox Technical Services Y-12, Llc Delayed unlatching mechanism
US9033376B2 (en) * 2012-02-01 2015-05-19 Consolidated Nuclear Security, LLC Delayed unlatching mechanism

Also Published As

Publication number Publication date
DE2031415A1 (de) 1971-02-11
CA927361A (en) 1973-05-29
GB1320011A (en) 1973-06-13
FR2061559B2 (ru) 1974-06-14
FR2061559A2 (ru) 1971-06-25
DE2031415C2 (de) 1982-08-12

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