TURBOMACHINE NACALE LOCK

Abstract

A lock (50) for a turbomachine nacelle comprising first and second cowlings (20, 22), the lock (50) comprising: - a first part (52) intended to be fixed to the first cowling (20) and having a hook (30) and a handle (28) for actuating the hook (30), and - a second part (54) intended to be fixed to the second cowling (22) and having a bracket (56) and a loop (33) configured to cooperate with said hook (30), the first or second part (52, 54) having a threaded rod (62) connected to said hook (30) or to said loop (33) and receiving an adjusting nut (66), characterized in that it comprises at least one rotational locking element (70) for the nut (66) on the threaded rod (32), said at least one locking element (70) being carried directly by a support (58) of the second part (54) or by the actuating handle (28) of the first part (52). Figure for the abbreviation: Figure 7

Description

Title of the invention: LOCK FOR TURBOMACHINE NACELLE Technical field of the invention

[0001] The present invention relates to a lock for a turbomachine nacelle, in particular an aircraft turbomachine, and a nacelle equipped with such a lock. The lock is shaped to lock cowls in the closed position when it occupies a locking configuration and to allow the cowls to be opened when it occupies an unlocking configuration. Technical background

[0002] The technical background includes in particular document FR-A1-3 015 435.

[0003] Engine assemblies for aircraft generally comprise a nacelle forming a generally annular outer casing housing inside a turbomachine arranged along the longitudinal axis of this nacelle. The turbomachine receives fresh air coming from the upstream side, and discharges on the downstream side the hot gases resulting from the combustion of the fuel, which provide a certain thrust.

[0004] An aircraft turbomachine generally comprises, from upstream to downstream, a fan and several modules such as a low pressure compressor followed by a high pressure compressor, an annular combustion chamber, a high pressure turbine followed by a low pressure turbine, which drive the corresponding low or high pressure compressor, and a gas ejection system. Upstream and downstream are defined relative to the normal flow direction of the gas in a flow vein (from upstream to downstream).

[0005] In the case of dual-flow turbomachines, the high and low pressure bodies are crossed by a primary air flow and the fan produces a secondary air flow which circulates in the turbomachine, between a casing and a nacelle or external casing of the turbomachine, in a cold flow channel. At the outlet of the nozzle, the gases from the primary flow are mixed with the secondary flow to produce a propulsive force, the secondary flow here providing the majority of the thrust in normal operation giving a direct jet.

[0006] Some nacelles include a thrust reversal system which at least partially closes the annular cold air stream, and rejects the secondary flow forward, forming an inverted jet which generates a braking counter-thrust of the aircraft. A known type of nacelle includes two half-cowls or cowls covering the middle section surrounding the secondary flow fan connected to each other by a hinge having a longitudinal axis located in the upper part, so as to allow a opening the lower parts of these covers for maintenance operations.

[0007] The hoods are held in the closed position, generally in the lower part, by locks which provide tangential clamping between these two hoods.

[0008] In a known manner, these locks comprise a hook and a loop, each fixed to one of the covers. In a locking configuration of the locks, the hook cooperates with the loop in a closed position of the covers. In an unlocking position of the locks, the hook is released from the loop and allows the covers to be opened.

[0009] Locks are generally operated manually by an operating handle.

[0010] The loop is located at a longitudinal end of a threaded rod which receives a nut for adjusting the pre-tension or pre-load of the lock. This nut is screwed or unscrewed to adjust the position of the loop with respect to the hook and thus the force necessary to apply to the hook so that it locks onto the loop and unlocks from the loop, and therefore to move from the locking position to the unlocking position, and vice versa. It is necessary to ensure that this pre-load does not become disturbed, either in flight or during the various maintenance operations.

[0011] In the current technique, one solution consists of immobilizing the adjustment nut in rotation by protrusions which are carried by a part added to the lock, such as a housing, and which cooperate with housings on the flank of the nut.

[0012] Several solutions exist to ensure that the flank of the adjustment nut remains pressed against these protrusions. Springs or wavy washers can be used to press the nut against the protrusions and to sense the passage from one housing to another housing facing the protrusion(s) by bringing the nut back against it(them) in the absence of preload.

[0013] This preload adjustment nut can be located on the hook or loop side of the latch.

[0014] These solutions are however not satisfactory in particular because the engagement of the protrusions in the nut housings is difficult to detect. When adjusting the preload, it is possible that the protrusions do not fit correctly into the housings provided on the side of the nut. In this case, when closing the lock, these protrusions can be crushed and damaged, which can have an impact on the preload but also on ensuring its stability.

[0015] The objective of the present invention is thus to propose a nacelle lock making it possible to overcome at least some of these drawbacks of the prior art. Summary of the invention

[0016] To this end, the invention relates to a lock for a turbomachine nacelle comprising first and second cowls, the lock comprising: - a first part intended to be fixed to the first cover and comprising a hook and a handle for actuating the hook, the hook being movable from an unlocking position to a locking position, the actuating handle being connected to the hook and being movable from a closing position to an opening position, the movement of the actuating handle from its closing position to its opening position causing the movement of the hook from its locking position to its unlocking position, and vice versa, and

[0017] - a second part intended to be fixed to the second cover and comprising a stirrup comprising a loop which is configured to cooperate with said hook,

[0018] the first or second part comprising a threaded rod which is connected to said hook or to said loop, this threaded rod receiving an adjustment nut whose screwing / unscrewing makes it possible to adjust the position of the loop of the stirrup with respect to the hook, or vice versa,

[0019] the hook being adapted to engage the loop of the stirrup when the hook is moved from its unlocking position to its locking position, and to disengage from the loop of the stirrup when the hook is moved from its locking position to its unlocking position,

[0020] characterized in that it further comprises at least one member for immobilizing the nut in rotation on the threaded rod, said at least one immobilizing member being carried directly by a support of the second part or by the actuating handle of the first part

[0021] It is therefore understood that the support of the second part, or the actuating handle of the first part, comprises at least one member for immobilizing the nut in rotation on the threaded rod. It is also understood that the threaded rod is part of the first or second part. The invention thus proposes to provide the member for immobilizing the nut either directly on the support of the second part, or directly on the actuating handle of the first part. This is advantageous because it is not necessary to provide an additional part such as a housing to immobilize the nut in rotation. The lock is therefore simpler and less expensive to manufacture. Furthermore, the cooperation of the immobilizing member with the nut is more easily visible and therefore a lack of cooperation can be easily identified by an operator, for example during a maintenance operation.In the case where the immobilizing member is located on the handle, the handle can be configured so that it cannot adopt its closed position if the immobilizing member does not. does not cooperate properly with the nut to immobilize it.

[0022] The lock according to the invention may comprise one or more of the following characteristics, taken in isolation from one another or in combination with one another in all technically possible combinations:

[0023] — the loop or hook is located at one longitudinal end of the threaded rod;

[0024] — the threaded rod passes through an orifice of a lug which is part of the bracket of the stirrup or of a hook support;

[0025] — the first or second part comprises a support having a tab fastener which includes an orifice crossed by the threaded rod;

[0026] - the support of the second part comprises a fixing lug which comprises a hole crossed by the threaded rod; - said at least one member is formed in a single piece with the support (or a part of the support) of the second part, or with the actuating handle (or a part of the handle) of the first part; alternatively, it could be fixed on the support or the handle; - said at least one member is configured to cooperate by engagement with an external periphery of the nut; - said at least one organ is a projection; - the nut comprises at its external periphery a plurality of recesses which are distributed around the nut and which serve both to drive it in rotation for the purpose of screwing / unscrewing it, and also to immobilize it in rotation;

[0027] — the projection comprises a free end configured to be engaged in one of the nut recesses;

[0028] — recesses are holes or notches; - said at least one member is located on one face of the actuating handle, and in which, when the actuating handle is in its closed position, this face at least partially covers the nut and said at least one member immobilizes the nut in rotation and, when the actuating handle is in its open position, this face is moved away from the nut and said at least one member no longer immobilizes the nut in rotation; - said at least one member is located on a face of the support which at least partially covers the nut;

[0029] — said at least one member is connected to said leg;

[0030] — the threaded rod of the stirrup is mounted axially sliding in the hole of the leg, along an axis of elongation of the threaded rod, and

[0031] — the second part comprises an elastic element which axially stresses the loop on the side opposite the nut, the stirrup being axially movable in the hole in the lug from an adjustment position in which the nut is distant from said at least one member and can be screwed / unscrewed, and an immobilization position in which the nut is immobilized in rotation by said at least one member; - the second part further comprises a guide ring which is inserted into the hole in the tab and which is crossed by the threaded rod of the stirrup;

[0032] — the ring comprises an external annular collar which is intended to be inserted between the leg or legs and the nut;

[0033] — the handle is configured to be able to adopt its closed position when the free end of the projection is aligned with one of the recesses of the nut, and so as not to be able to adopt its closed position when the free end of the projection is not aligned with one of the recesses of the nut;

[0034] — the stirrup is configured to be able to adopt its immobilization position when the free end of the projection is aligned with one of the recesses of the nut, and so as not to be able to adopt its immobilizing position when the free end of the projection is not aligned with one of the recesses of the nut;

[0035] — the member is formed in a single piece with the part of the support comprising said paw ;

[0036] — the member is formed in one piece with the part of the operating handle comprising a manual gripping element.

[0037] The invention also relates to a nacelle for a turbomachine, comprising first and second cowls, as well as a lock as described above, the first part of the lock being fixed to the first cowl, and the second part of the lock being intended to be fixed to the second cowl;

[0038] — the projection has a height greater than or equal to four times a depth of the nut recesses;

[0039] — the projection is engaged in one of the recesses of the nut over a distance re having less than four times the height of the projection;

[0040] — the projection is oriented towards the axis of elongation of the threaded rod;

[0041] — the second part comprises a support comprising a bracket for fixing the stirrup, the stirrup comprising the threaded rod and the loop which is located at a longitudinal end of the threaded rod, the threaded rod passing through an orifice of said tab and receiving the adjustment nut, the screwing / unscrewing of this nut on the threaded rod making it possible to adjust the position of the loop of the stirrup with respect to the tab of the support.

[0042] The invention also relates to a turbomachine, in particular for an aircraft, comprising at least one nacelle as described above. Brief description of the figures

[0043] The present invention will be better understood and other details, features and The advantages of the present invention will appear more clearly on reading the description of a non-limiting example which follows, with reference to the appended drawings in which: [Fig.l] [Fig.l] is a schematic overview in axial section of a turbomachine nacelle; [Fig.2] [Fig.2] is a schematic perspective view of a nacelle lock; [Fig.3] [Fig.3] is a schematic sectional view of a lock in a locked position; [Fig.4] [Fig.4] is a schematic sectional view of the lock of [Fig.2] in an unlocked position; [Fig.5] [Fig.5] is a schematic perspective and sectional view of a lock according to a first embodiment of the invention, in a locked position;

[0044] [Fig.6] [Fig.6] is another schematic sectional view of the lock of [Fig.5], in the locked position; [Fig.7] [Fig.7] is a partial schematic perspective view of the lock of [Fig.5], in the locked position;

[0045] [Fig.8] [Fig.8] is another partial schematic perspective view of the lock of [Fig.8];

[0046] [Fig.9] [Fig.9] is a partial schematic perspective view of a lock according to an alternative embodiment of the invention; [Fig. 10] [Fig. 10] is another partial schematic perspective view of the lock of [Fig.9], without the nut and the yoke; [Fig. 11] [Fig. 11] is another partial schematic perspective view of the lock of [Fig.9], the stirrup being in an immobilizing position; [Fig. 12] [Fig. 12] is another partial schematic sectional view of the lock of [Fig. 9], the stirrup being in the immobilizing position; and

[0047] [Fig. 13] [Fig. 13] is another partial schematic perspective view of the lock of [Fig.9], the stirrup being in an adjustment position. Detailed description of the invention

[0048] [Fig.l] shows a nacelle 10 containing a turbomachine supported by a pylon 4 fixed under the wing of an aircraft. The nacelle comprises a front section 6 comprising a profiled air inlet, a central section 2 surrounding a cold air blower 14, and a rear section 8 comprising a thrust reverser, for example with grilles or doors. The nacelle forms an external profiling of the annular vein 12 guiding the flow of cold air, and an external aerodynamic fairing.

[0049] The nacelle has a longitudinal axis A and has an annular shape around this axis. The central section 2 of the nacelle comprises two external covering hoods, arranged symmetrically with respect to a vertical axial plane P (which is for example the section plane of [Fig.l]). These hoods can open laterally by pivoting around a hinge comprising a longitudinal axis arranged in the upper part and parallel to the longitudinal axis A of the nacelle. The rear section comprises two rear lateral parts, which close on each other along the same plane P of axial symmetry.

[0050] The invention applies to any nacelle of a turbomachine comprising two cowls or two rear lateral parts which can open and close on top of each other, and in particular to the nacelle illustrated in [Fig.l]. In particular, these two cowls can be fan cowls or reverser cowls which slide rearwards during a thrust reversal phase.

[0051] [Fig. 2] is a view from below of the nacelle 10 showing at the top the two front covers 20, 22 and at the bottom the two rear parts 24, 26, these closed covers and rear parts connecting along the plane of symmetry P. The two rear parts 24, 26 are clamped to each other in a tangential direction by several locks, including a lock comprising an actuating handle 28, maneuvering in a transverse plane. When this lock is locked and the front covers 20, 22 are closed, the handle 28 is arranged in a fitted manner in a transverse external cutout extending over these two covers, at the limit of the rear parts 24, 26. The free end of the handle 28 which tilts in the maneuver, shown on the right of the figure, has a recess which shifts it slightly towards the axis of the nacelle, to come below the right front cover 20.

[0052] Figures 3 and 4 show the handle 28 fixed by pivots to the left rear part 26, acting by a rocker 34 on a locking lever comprising a main hook 30 coming to take a loop 33 located at the end of a rod 32 fixed to the right rear part 24. Once the handle 28 is completely closed, a safety hook 36 pivotally fixed on the handle 28, automatically locks by the action of a spring on the main hook 30 or another element of the lock. To open the handle 28, it is necessary to press on a pusher 38 of the safety hook 36 located in the outer plane of the handle 28, in order to press on it to release this hook and free this handle which can then tilt.

[0053] The front covers 20, 22 come just below the rear parts 24, 26. The outer surface of the handle 28 fitted in the cutout of the covers 20, 22, comes substantially at the level of the surface of these covers in order to obtain aerodynamic continuity of the outer surface of the nacelle.

[0054] The free end of the handle 28 may have a recess 40 which comes inside the right front hood 20, forming a substantially flat surface parallel to this hood with a clearance, so as to avoid any risk of contact between this hood and this handle. There is also a gap between the closed handle 28 and the edges of the cutout.

[0055] This front cover 20 being closed, it is then no longer possible to open the handle 28, nor to close it if it is open. Furthermore, the handle 28 being held open by a spring, and the main hook 30 being tilted downwards, protruding radially outwards from the rear parts 24, 26 supporting it, the cutting of the covers 20, 22 makes it possible in all cases, when they are closed or dropped, not to hit an element of the lock, in particular the handle and the hook.

[0056] The lock as illustrated in Figures 3 and 4, and in particular the mechanism between the handle 28 and the hook 30, is of the three-point type, well known to those skilled in the art.

[0057] We now refer to Figures 5 to 8 which illustrate a first embodiment of a lock 50 according to the invention.

[0058] The lock 50 essentially comprises two parts 52, 54 which are intended to be fixed respectively to two covers, such as the covers 20, 22, or to two rear parts 24, 26, as in the aforementioned example.

[0059] The first part 52 of the lock 50 is that comprising the hook 30 and the actuating handle 28.

[0060] The hook 30 is movable from an unlocking position, comparable to that of [Fig. 4], to a locking position illustrated in Figures 5 and 6.

[0061] The actuating handle 28 is connected to the hook 30, for example by a three-point mechanism, and is movable from a closed position illustrated in Figures 5 to 8, to an open position comparable to that of [Fig.4]. This movement can be achieved by pivoting or tilting.

[0062] The movement of the actuating handle 28 from its closed position to its open position causes the movement of the hook 30 from its locked position to its unlocked position, and vice versa, thanks to the aforementioned mechanism.

[0063] The second part 54 of the lock 50 comprises a stirrup 56 and a support 58 comprising a lug 60 for fixing the stirrup 56.

[0064] The stirrup 56 comprises a threaded rod 62 and the loop 33 which is located at a longitudinal end of this threaded rod 62 and which is configured to cooperate with the hook 30 of the first part 52.

[0065] The threaded rod 62 passes through an orifice 64 of the lug 60 of the support 58 and an adjustment nut 66 is screwed onto the threaded rod 62. Screwing / unscrewing this nut 66 onto the threaded rod 62 makes it possible to adjust the position of the loop 33 of the stirrup 56 with respect to the lug 60 of the support 58 (according to the double arrow F1 of [Fig.6]).

[0066] The hook 30 is able to engage on the loop 33 of the stirrup 56 when the hook 30 is moved from its unlocking position ([Fig.4]) to its locking position. (figures 5-6), and to disengage from the loop 33 of the stirrup 56 when the hook 30 is moved from its locking position (figures 5-6) to its unlocking position ( [Fig.4]). More precisely, the movement of the actuating handle 28 from its closing position to its opening position causes the hook 30 to move from its locking position to its unlocking position and the disengagement of the hook 30 from the loop 33, and conversely, the movement of the actuating handle 28 from its opening position to its closing position causes the hook 30 to move from its unlocking position to its locking position and the engagement of the hook 30 in the loop 33.

[0067] The lock 50 may also include a safety hook 36 as seen in [Fig.5] and as described above.

[0068] The threaded rod 62 of the stirrup 56 is mounted axially sliding in the orifice 64 of the lug 60, along an axis of elongation A of the threaded rod 62.

[0069] The second part 54 may here comprise a guide ring 68 which is inserted into the orifice 64 of the lug 60 and which is crossed by the threaded rod 62 of the stirrup 56. This ring 68 comprises an external annular collar 68a which is intended to be interposed between the lug 60 and the nut 66.

[0070] The second part 54 may further comprise an elastic element 69 which axially stresses the loop 33 on the side opposite the nut 66. This elastic element 69 may be a helical spring which is mounted around the threaded rod 62 and interposed axially between the loop 56 and the lug 60 or the ring 68. The elastic element 69 or the spring bears for example axially respectively on the loop 33 and on the lug 60 or on the end of the ring 68 opposite its collar 68a.

[0071] The stirrup 56 is advantageously axially movable in the orifice 64 of the lug 60, or in the ring 68, from a retracted position in which the nut 66 is axially spaced from the lug 60 and the ring 68, and an advanced position in which the nut 66 is axially pressed against the lug 60 or the ring 68. The advanced position of the nut 66 is shown in Figures 5 and 6, and its retracted position is shown schematically in dotted lines in [Fig.6].

[0072] The lock 50 further comprises a member 70 for immobilizing the nut 66 in rotation on the threaded rod 62.

[0073] In the embodiment of figures 5 to 8, it is the actuating handle 28 of the first part 52 which comprises this immobilizing member 70. The member 70 is directly carried by the handle 28 and is advantageously formed in a single piece with the handle 28.

[0074] In the example shown, the handle 28 has an elongated shape and comprises a longitudinal end which is intended to at least partially cover the second part 54 when the handle 28 is in its closed position shown in FIGS. 5 and 6. This end comprises an internal face 28a which is oriented towards the stirrup 56 in this closed position of the handle 28, and which extends at least partly around the nut 66.

[0075] In the example shown, the member 70 is formed by a projection on this face 28a. The projection is for example in the form of a tooth and has for example a general orientation perpendicular to the face 28a. The member 70 or the projection comprises an end connected to the face 28a and an opposite end which is free and which is intended to cooperate by engagement with a recess 72 of the nut 66.

[0076] The nut 66 comprises several recesses 72 at its external periphery, which are regularly distributed, and which are for example blind holes or notches. In the example shown, these recesses 72 are axial notches extending over substantially the entire axial dimension of the nut 66.

[0077] These recesses 72 can be used to drive the nut 66 in rotation, manually or by means of a tool, for its screwing and unscrewing. It is understood that one of these recesses is also used to ensure the immobilization in rotation of the nut 66 around its axis.

[0078] The member 70 or the projection is thus intended to engage in one of these recesses 72 to immobilize the nut in rotation. It is understood that it is the circumferential abutment of the side walls of the recess 72, with the free end of the projection or of the member 70, which will limit the rotational movement of the nut 66 around its axis. To facilitate the insertion of the member 70 into the recess 72, a clearance J can be provided as illustrated in [Fig. 8]. This clearance J corresponds to the difference in dimensions between the width of a recess 72 (of the notch in the example shown) and the thickness of the free end of the member 70. This free end can be beveled to facilitate this insertion and adjust the value of this clearance J.

[0079] In the example shown, the projection has a height H1 greater than or equal to four times a depth PI of the recesses 72 of the nut 66. The projection is engaged in the recess 72 of the nut 66 over a distance DI representing less than four times the height H1 of the projection. These parameters can be adapted according to several criteria such as the position of the handle 28, its thickness, the position of the threaded rod 62, etc.

[0080] Since it is the actuating handle 28 of the lock 50 which comprises the member 70 for immobilizing the nut 66, it is understood that the nut 66 is immobilized only if the handle 28 is in its closed position shown in FIGS. 5 to 8. Thus, as soon as the handle 28 is in its closed position, the nut 66 is immobilized in rotation. When the handle 28 is in its open position, comparable to that of [Fig. 4], the nut 66 is no longer immobilized in rotation and can be screwed / unscrewed.

[0081] Advantageously, the handle 28 is configured to be able to adopt its closed position when the free end of the projection or of the member 70 is aligned with one of the recesses 72 of the nut 66, and to be unable to adopt its closed position when the free end of the projection or of the member 70 is not aligned with one of the recesses 72 of the nut 66. This is a foolproofing means which allows, for example, an operator to ensure that the nut 66 is properly immobilized in rotation when the handle 39 is in its closed position. Conversely, if the operator is unable to close the handle 28, he will have to slightly screw or unscrew the nut 66 so that one of these recesses 72 is aligned with the free end of the projection or member 70 of the handle when it is moved to the closed position.

[0082] The flank of the nut 66 which is supported on the collar 68a may comprise male or female elements, respectively, intended to cooperate by engagement with female or male elements, respectively, located on the collar 68a, so as to form additional means for immobilizing the nut 66 in rotation around its axis. It is then necessary to move the nut 66 from its advanced position to its retracted position, so as to be able to screw it or unscrew it.

[0083] In the embodiment of figures 9 to 13, it is the support 58 of the second part 54 which comprises the immobilizing member 70. The member 70 is directly carried by the support 58 and is advantageously formed in a single piece with the support 58.

[0084] In the example shown, the support 58 comprises the member 70 near the lug 60 for fixing the stirrup 56.

[0085] The support 58 comprises a face 58a which is oriented towards the stirrup 56 and which extends at least partly around the nut 66. The face 58 can be connected to the tab 60 and can have a perpendicular orientation relative to this tab 60, as in the example shown.

[0086] In the example shown, the member 70 is formed by a projection on this face 58a. The projection is for example in the form of a tooth and has for example a general orientation perpendicular to the face 58a, being oriented towards the axis of the threaded rod 62. The member 70 or the projection comprises an end connected to the face 58a and an opposite end which is free and which is intended to cooperate by engagement with one of the recesses 72 of the nut 66 which is similar to that described above in relation to FIGS. 5 to 8.

[0087] The member 70 or the projection is thus intended to engage in one of these recesses 72 to immobilize the nut 66 in rotation. It is understood that it is the circumferential abutment of the side walls of the recess 72, with the free end of the projection or of the member 70, which will limit the rotational displacement travel of the nut 66. around its axis. To facilitate the insertion of the member 70 into the recess 72, a clearance may be provided as mentioned above. The free end of the projection or of the member 70 may also be beveled.

[0088] In the example shown, the projection or member 70 is located closest to the tab 60 and is even connected to this tab.

[0089] The nut 66 is intended to be immobilized in rotation when the stirrup 56 is in its advanced position mentioned above, which is an immobilization position, and to be free in rotation when the stirrup 56 is in its retracted position, which is a preload adjustment position.

[0090] Thus, as soon as the stirrup 56 is in its immobilization position which is shown in Figures 9, 11 and 12, the nut 66 is immobilized in rotation. When the stirrup 56 is in its adjustment position which is shown in [Fig.13], the nut 66 is no longer immobilized in rotation and can be screwed / unscrewed.

[0091] It is understood that the movement of the stirrup 56, from its immobilization position to its adjustment position, must be done over a sufficient distance so that the projection or the member 70 comes out of the recess 72 of the nut.

[0092] Advantageously, the stirrup 56 is configured to be able to adopt its immobilization position when the free end of the projection or of the member 70 is aligned with one of the recesses 72 of the nut 66, and to not be able to adopt its immobilization position when the free end of the projection or of the member 70 is not aligned with one of the recesses 72 of the nut 66. This is a foolproofing means which allows, for example, an operator to ensure that the nut 66 is indeed immobilized in rotation when it can adopt its immobilization position. Conversely, if the stirrup 56 does not return to its immobilization position, due to the stress exerted by the elastic element 69 for example, it will have to slightly screw or unscrew the nut 66 so that one of these recesses 72 is aligned with the projection or the member 70, and so that the stirrup can adopt its advanced position or immobilization of the nut 66.

[0093] The flank of the nut 66 which bears on the collar 68a may further comprise male or female elements, respectively, intended to cooperate by engagement with female or male elements, respectively, located on the collar 68a, as mentioned above.

[0094] In a variant of the invention not shown, it is not the loop 33 which is connected to the threaded rod 62 but it is the hook 30. The hook 30 can be connected to a longitudinal end of the threaded rod 62 and an assembly with an adjustment nut 66 and an immobilizing member 70, similar to that described above, can be adopted.

[0095] The lock according to the invention has numerous advantages, including: - the reduction in the number of parts to ensure the immobilization of the nut, the reliability and simplicity of this immobilization, the deception mentioned in the above, there is no risk of forgetting to immobilize the nut because this immobilization is automatic, etc.

Claims

Claims

1. Lock (50) for a turbomachine nacelle comprising first and second cowls (20, 22), the lock (50) comprising: - a first part (52) intended to be fixed to the first cowl (20) and comprising a hook (30) and a handle (28) for actuating the hook (30), the hook (30) being movable from an unlocking position to a locking position, the actuating handle (28) being connected to the hook (30) and being movable from a closing position to an opening position, the movement of the actuating handle (28) from its closing position to its opening position causing the movement of the hook (30) from its locking position to its unlocking position, and vice versa, and - a second part (54) intended to be fixed to the second cowl (22) and comprising a stirrup (56) comprising a loop (33) which is configured to cooperate with said hook (30),the first or second part (52, 54) comprising a threaded rod (62) which is connected to said hook (30) or to said loop (33), this threaded rod (62) receiving an adjustment nut (66) the screwing / unscrewing of which makes it possible to adjust the position of the loop (33) of the stirrup (56) with respect to the hook (30), or vice versa, the hook (30) being able to engage on the loop (33) of the stirrup (56) when the hook (30) is moved from its unlocking position to its locking position, and to disengage from the loop (33) of the stirrup (56) when the hook (30) is moved from its locking position to its unlocking position, characterized in that it further comprises at least one member (70) for immobilizing the nut (66) in rotation on the threaded rod (32), said at least one immobilizing member (70) being carried directly by a support (58) of the second part (54) or by the actuating handle (28) of the first part (52).,

2. Lock (50) according to claim 1, in which the support (58) of the second part (54) comprises a fixing lug (60) which comprises an orifice (64) crossed by the threaded rod (62).

3. Lock (50) according to claim 1 or 2, wherein said at least one member (70) is formed in one piece with the support (58) of the second part (54), or with the actuating handle (28) of the first part (52).

4. Lock (50) according to one of the preceding claims, wherein said at least one member (70) is configured to cooperate by engagement with an external periphery of the nut (66).

5. A lock (50) according to any preceding claim, wherein said at least one member (70) is a projection.

6. Lock (50) according to one of the preceding claims, in which the nut (66) comprises at its external periphery a plurality of recesses (72) which are distributed around the nut (66) and which serve both to drive it in rotation for the purpose of screwing it in / out, and also to immobilize it in rotation.

7. Lock (50) according to one of the preceding claims, wherein said at least one member (70) is located on a face (28a) of the actuating handle (28), and wherein, when the actuating handle (28) is in its closed position, this face (28a) at least partially covers the nut (66) and said at least one member (70) immobilizes the nut (66) in rotation and, when the actuating handle (28) is in its open position, this face (28a) is moved away from the nut (66) and said at least one member (70) no longer immobilizes the nut (66) in rotation.

8. Lock (50) according to one of the preceding claims, wherein said at least one member (70) is located on a face (58a) of the support (58) which at least partially covers the nut (66).

9. Lock (50) according to one of the preceding claims, wherein the second part (56) further comprises a guide ring (68) which is traversed by the threaded rod (62).

10. Nacelle (10) for a turbomachine, comprising first and second cowls (20, 22), as well as a lock (50) according to any one of the preceding claims, the first part (52) of the lock (50) being fixed to the first cowl (20), and the second part (54) of the lock (50) being intended to be fixed to the second cowl (22).

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