Abstract:
An emergency opening device for an overhead locker with a housing and a lowerable shell includes a connecting element which is connectable to a retention system operatively coupling the housing to the lowerable shell. The emergency opening device also includes a locking device adapted to move from a locked position in which the locking device is coupled with the connecting element to an unlocked position in which the locking device is uncoupled from the connecting element to release the lowerable shell from the retention system.

Description:
This application claims the benefit of International Application No. PCT/EP2006/006202, filed on Jun. 27, 2006, under 35 U.S.C. §371 and/or as a continuation under 35 U.S.C. §120, and German Application No. 10 2005 033259.5, filed on Jul. 15, 2005. 
     TECHNICAL FIELD 
     The invention relates to an emergency opening device for an overhead locker with a lowerable shell and to an overhead locker fitted with an emergency opening device of this type. 
     BACKGROUND 
     Overhead lockers with a lowerable shell are currently used in passenger aeroplanes in particular as they advantageously allow optimum use of space and, at the same time, a high degree of operating convenience. The lowerable shell is pivotal from an upper closed position, in which optimum head freedom of the passenger sitting under the overhead lockers is ensured, into a lower, open loading or unloading position. Even relatively short people can comfortably deposit or remove items of luggage in/from the shell in the loading or unloading position. 
     Overhead lockers of this type conventionally comprise a retention system which is used to pivotally fasten the lowerable shell on a component secured to the structure, such as an overhead locker housing and/or a ceiling construction of an aircraft passenger cabin. The retention system may, moreover, be used to introduce tensile forces of a force-assisting device to raise the lowerable shell. A typical retention system comprises a cable, optionally guided over one or more guide roller(s), the ends of which are connected to the lowerable shell or the component secured to the structure. 
     A closure mechanism is also conventionally provided which can be provided in an easily accessible position and can be easily actuated. In its closed position the closure mechanism holds the lowerable shell in its upper closed position, while in its open position it allows lowering of the overhead locker shell from its upper closed position into its lower, open loading or unloading position. Consequently convenient operation of the overhead locker is made possible. At the same time risks of injury are avoided which, for example, could result owing to uncontrolled lowering of the shell. 
     In principle, for safety reasons, there is a need in particular when using an overhead locker with a lowerable shell in passenger aeroplanes that the lowerable shell can be brought from its upper closed position into its lower, open loading or unloading position even in the event of the retention system malfunctioning, which can be triggered for example by jamming of the cable or a fire in the overhead locker. Therefore overhead lockers of this type also comprise an emergency opening device which, if required, separates the retention system from the lowerable shell or component secured to the structure. For example the emergency opening device may be configured in such a way that it separates the guided cable of the retention system from the lowerable shell in the event of an actuation. 
     A known emergency opening device comprises a shearing pin which tears when a corresponding trigger force is applied, for example by forceful pulling on the lowerable shell, so that the guided cable of the retention system is separated from the lowerable shell. Use of an emergency opening device with a shearing pin has the drawback that, depending on the overall construction of the overhead locker and the lever conditions resulting therefrom on the guided cable of the retention system, very high forces are possibly required to trigger the emergency opening device. Owing to manufacturing and assembly tolerances high dispersion of the triggering force may also occur. It is also disadvantageous, in particular in the event of a fire in the overhead locker, that the emergency opening device has to be actuated by pulling on the lowerable shell as smoke or flames may possibly issue from the overhead locker and injure the person actuating the emergency opening device. Finally, during normal operation of the overhead locker there is the risk of unintentional triggering of the emergency opening device. 
     DE 100 01 038 A1 discloses an overhead locker with a lowerable shell which comprises a motive drive device for lowering the overhead locker shell from an upper closed position into a lower, open position and for raising the overhead locker shell from the lower, open position into the upper closed position. The drive device is, for example, constructed as a toothed belt drive and comprises a drive motor, the rotary movement of which can be transmitted via a splined shaft to a toothed belt. A catch of the toothed belt drive is fastened to support arms of the lowerable shell via brackets provided with rollers, so that the lowerable shell can be moved between its upper closed position and its lower, open position by an actuation of the toothed belt drive. To fix the overhead locker shell in its upper closed position there is a locking device driven by a lifting magnet which can be actuated by means of an actuating switch. To allow manual opening and closing of the overhead locker even in the event of failure of the motive drive device, a coupling arranged on the splined shaft of the toothed belt is provided. The coupling can be moved via a hand lever and a cable pull into a disengaged position in order to decouple the non-functioning drive motor from the force-transmitting components of the belt drive. Actuation of the actuating switch can subsequently unlock the lifting magnet-operated locking device and the overhead locker shell can be manually moved into its lower, open position. 
     The object of the invention is to provide an emergency opening device for an overhead locker with a lowerable shell, which device, if required, allows reliable separation of a retention system for fastening the lowerable shell to a component secured to the structure from the lowerable shell or the component secured to the structure and which can also be actuated simply and safely. The invention is also directed to the object to providing an overhead locker fitted with an emergency opening device of this type. 
     SUMMARY OF THE INVENTION 
     This object is achieved by an emergency opening device for an overhead locker with a lowerable shell and an overhead locker as described below. 
     The emergency opening device according to the invention for an overhead locker with a lowerable shell comprises a connecting element which is connectable to a retention system for fastening the lowerable shell to a component secured to the structure. The component secured to the structure may for example be an overhead locker housing or a ceiling construction, in particular a ceiling construction of an aeroplane passenger cabin. A locking device of the emergency opening device is connectable either to the lowerable shell or the component secured to the structure. This locking device is adapted to fasten the connecting element to the lowerable shell or the component secured to the structure, in a locked position, and to allow separation of the connecting element from the lowerable shell or the component secured to the structure, in an unlocked position. In other words, in the assembled state of the locking device the connecting element, and thus the retention system, may be separated from the lowerable shell or the component secured to the structure by a movement of the locking device from its locked position into its unlocked position. As a result the lowerable shell may be brought from its upper closed position into its lower, open loading or unloading position even if the retention system malfunctions. 
     The emergency opening device according to the invention has the advantage that to actuate the locking device, i.e. for movement of the locking device from its locked position into its unlocked position, no particular force application is required. In contrast to an emergency opening device comprising a shearing pin, the emergency opening device according to the invention can thus be actuated even by people who are not very strong. In particular when using the emergency opening device according to the invention in an overhead locker with a lowerable shell on board a passenger aeroplane this contributes to increased safety. 
     The locking device of the emergency opening device according to the invention is preferably configured in such a way that it may be repeatedly moved from its locked position into its unlocked position and back again. Furthermore, owing to the fact that only relatively low forces occur on actuation of the emergency opening device, damage to components thereof, for example the connecting element or the locking device, is virtually ruled out. After triggering the emergency opening device can therefore generally be made ready for operation again relatively easily. 
     In a preferred embodiment of the emergency opening device according to the invention the locking device comprises a base panel which is connectable to the lowerable shell of the overhead locker or the component secured to the structure. The base panel can for example comprise one or more aperture(s) and be fastened by means of a screwed or riveted joint to the lowerable shell or the component fastened to the structure. Alternatively, the base panel may also be glued to the lowerable shell or the component secured to the structure. 
     The locking device also preferably comprises a lever which is pivotal about an axis and movable between a first and a second position. The lever may be adapted to cooperate with the connecting element in its first position and to release the connecting element in its second position. In other words, by moving the pivotal lever from its first position into its second position a connection between the connecting element and the locking device may be released. In the assembled state of the emergency opening device according to the invention the retention system for fastening the lowerable overhead locker shell to a component secured to the structure may thus be separated from the lowerable shell or the component secured to the structure by a movement of the pivotal lever from its first position into its second position. A lever mechanism of this type may be easily actuated even by unpractised people and thus contributes to increasing the safety of the emergency opening device. 
     The pivotal lever of the locking device can for example be fastened by means of a screwed or riveted joint directly to the lowerable shell or the component secured to the structure. Alternatively, the lever may also be connected to the base panel of the locking device. In this case the base panel and the lever can be pre-assembled on the lowerable shell or the component secured to the structure as an independent module before assembly of the locking device. 
     The lever is preferably pivotal about an axis which is arranged at a first end or in the vicinity of the first end of the lever. For fixing the position of the swivelling axis, an opening may be formed in the lever through which a bearing pin or the like is passed. By using the entire, or virtually the entire, length of the lever as a lever arm the lever may then moved between its first and second positions by applying a relatively low force to a second end of it. As a result the force expenditure required to actuate the emergency opening device according to the invention may be reduced further. 
     The lever of the locking device is preferably resiliently pretensioned in its first position in which it provides a connection of the locking device to the connecting element and, in the assembled state of the emergency opening device, fastens the retention system to the lowerable shell or the component secured to the structure. The lever audibly engages with the connecting element during assembly of the emergency opening device owing to the resilient pretensioning of the pivotal lever. This consequently already allows certain checking of the proper connection between the locking device and the connecting element. Furthermore, the resilient force applied by the spring must firstly be overcome when the emergency opening device is actuated, in order to move the lever from its first position into its second position and thus separate the connecting element from the locking device and consequently separate the retention system from the lowerable shell or the component secured to the structure. As a result the risk of unintentional actuation of the emergency opening device is minimised. 
     In a preferred embodiment of the emergency opening device according to the invention, a locking nose is formed on the lever of the locking device. This locking nose is adapted to cooperate with a locking projection provided on the connecting element in the first position of the lever and to release the locking projection of the connecting element in the second position. Such a configuration of the lever and connecting element is relatively simple in terms of construction, can be inexpensively implemented and also allows secure connection between the connecting element and the locking device if the lever is in its first position. 
     The emergency opening device according to the invention preferably comprises a sliding block for sliding guidance of a preferably flat article, which, as has yet to be described in detail, can be used to move the pivotal lever of the locking device between its first and second positions. This ensures proper actuation of the lever if the person triggering the emergency opening device cannot see it. The sliding block may be fastened to the lowerable shell or the component secured to the structure by means of a screwed, riveted or glued joint. 
     In a preferred embodiment of the emergency opening device according to the invention, the locking device comprises a guide device for receiving and guiding the connecting element. The guide device can be constructed as a separate component and be fastened by means of a screwed, riveted or glued joint for example to the lowerable shell or the component secured to the structure. Alternatively, the guide device may also be attached to the base panel of the locking device or formed integrally therewith. 
     The guide device preferably comprises first and second guide elements, the first and second guide elements being arranged at a spacing from each other and between them forming a receiver for the connecting element. This arrangement has the advantage that when connecting the connecting element to the locking device and when separating the connecting element from the locking device, in the event of triggering of the emergency opening device the connecting element is displaced relative to the locking device in a guided and thus controlled manner. 
     A guide rail, which is adapted to cooperate with a guide groove provided on the guide device, is preferably formed on the connecting element. The guide rail can, for example, be provided on a side face of the connecting element and cooperate with a guide groove formed on the first or second guide element. It is understood that the connecting element may also be provided with a guide rail on two side faces, wherein in this case the first and second guide elements of the guide device comprise corresponding guide grooves. The configuration of the connecting element with a guide rail and the provision of a guide device provided with a guide groove allows particularly secure guidance of the connecting element in the guide device in a relatively simple manner in terms of construction. 
     A stop is preferably provided on the connecting element. This stop is used when connecting the connecting element to the locking device to fix the position of the connecting element relative to the locking device. The stop can, for example, be arranged adjacent to the guide rail formed on the connecting element and cooperate with a side face of the guide device if the connecting element is connected to the locking device. 
     In a preferred embodiment of the emergency opening device according to the invention the connecting element comprises a cable connection device. A cable connection device of this type is used for fastening the connecting element to a cable of the retention system via which the lowerable shell of the overhead locker is fastened to a component secured to the structure. The cable connection device is preferably provided with an adjusting device comprising a setscrew for finely adjusting the length of the retention system cable. 
     An overhead locker according to the invention comprises a lowerable shell, a retention system for fastening the lowerable shell to a component secured to the structure, for example an overhead locker housing and/or a ceiling construction of an aeroplane passenger cabin, and an above-described emergency opening device. By means of the emergency opening device the lowerable shell of the overhead locker may be moved in a simple, quick, controlled and safe manner from its upper closed position into its lower, open loading or unloading position even in the event of the retention system malfunctioning, which can be triggered for example by jamming of a retention system cable or by a fire in the overhead locker. 
     In a preferred embodiment of the overhead locker according to the invention, the emergency opening device is arranged on an outer face of the side wall of the lowerable shell or on the component secured to the structure. For example the locking device of the emergency opening device may be fastened in a region adjoining a base of the lowerable shell at the side wall thereof. In the assembled state of the emergency opening device the retention system for fastening the lowerable overhead locker shell to a component secured to the structure is separated from the lowerable shell when the emergency opening device is actuated. Consequently, with simultaneous actuation of a closure mechanism, which holds the lowerable shell in its upper closed position during normal operation of the overhead locker, the lowerable shell is moved from its upper closed position into its lower, open loading or unloading position. To prevent the shell from dropping down in an uncontrolled manner, what are referred to as end stops are conventionally provided on the overhead locker and/or a component secured to the structure, for example the overhead locker housing or the ceiling construction of the aeroplane passenger cabin, which stops hold the lowerable shell in a predetermined end position after an actuation of the emergency opening device and the separation associated therewith of the lowerable shell from the retention system. 
     The emergency opening device has a relatively low depth. It is therefore not necessary to form a receiver for the emergency opening device which, for example, could be produced by milling out the side wall of the lowerable shell. Rather the emergency opening device can be received in an conventionally approximately 15 mm wide gap which exists between the side wall of the lowerable shell and a side wall of an overhead locker housing in the closed state of the overhead locker. 
     The sliding block of the emergency opening device can be attached to a narrow projection for example which extends substantially perpendicularly to the outer face of the side wall of the lowerable shell in a region of the side wall of the lowerable shell adjoining the base of the lowerable shell. The overhead locker according to the invention can thus be fitted with the emergency opening device with relatively low manufacturing and assembly expenditure. 
     Between adjacent overhead lockers in the passenger cabin of an aeroplane there is conventionally a spacing which is sufficient that the emergency opening device provided on the outer face of the side wall of the lowerable overhead locker shell, i.e. the lever of the locking device, can be actuated by introducing a flat object, such as a credit card or a spoon, into a gap between adjacent overhead lockers, i.e. from a lateral position. Simple and controlled actuation of the emergency operating device is thus possible. To the contrary, vigorous pulling on the lowerable shell, as is required for example with an emergency opening device fitted with a shearing pin, is not necessary. As a result, risks of injury to the person actuating the emergency opening device are minimised in particular in the event of a fire in the overhead locker. 
     The overhead locker according to the invention preferably comprises two retention systems for fastening the lowerable shell to a component secured to the structure, a first retention system being provided in the region of a first side wall and a second retention system being provided in the region of a second side wall of the lowerable shell opposing the first side wall. The overhead locker then also comprises two emergency opening devices, a first emergency opening device being arranged on the first side wall of the lowerable shell and a second emergency opening device being arranged on the second side wall of the lowerable shell. In an overhead locker of this type, if required, controlled actuation of only one emergency opening device is also possible, so that the lowerable shell of the overhead locker can be separated from only one retention system and can remain connected to the other retention system. 
     The overhead locker according to the invention preferably comprises a cover element which partially surrounds the emergency opening device. The cover element can, for example, be detachably fastened to a side wall of the lowerable shell of the overhead locker and configured in such a way that the actuation of the locking device lever is not affected. The cover element protects the emergency opening device, in particular if the lowerable shell is in its lower, open loading or unloading position during normal operation of the overhead locker, against soiling and reduces the risk of unintentional actuation of the emergency opening device. 
     If the overhead locker according to the invention comprises a cover element the sliding block of the emergency opening device may be formed integrally therewith or fastened thereto. 
     A window is preferably formed in the cover element. A simple check can be made through this window during operation of the overhead locker as to whether the connecting element is properly connected to the locking device, without it being necessary to disassemble the cover element. It is understood, however, that the cover element can also be constructed without a window. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Preferred embodiments of the emergency opening device according to the invention and of the overhead locker according to the invention will now be described in more detail with reference to the accompanying drawings, in which: 
         FIG. 1  shows an overhead locker according to the invention with a lowerable shell and an emergency opening device, the lowerable shell being in its upper closed position, 
         FIG. 2  shows the overhead locker according to the invention illustrated in  FIG. 1 , the lowerable shell being in its lower, open loading or unloading position, 
         FIG. 3  shows an emergency opening device according to the invention for an overhead locker with a lowerable shell, 
         FIG. 4  shows a three-dimensional illustration of the emergency opening device shown in  FIG. 1  in its locked position, and 
         FIG. 5  shows a three dimensional illustration of the emergency opening device shown in  FIG. 1  in its unlocked position. 
     
    
    
     DETAILED DESCRIPTION 
     An overhead locker  10  shown in  FIGS. 1 and 2  comprises a lowerable shell  12  which comprises a base  14  and two mutually opposing side walls  16 . The lowerable shell  12  can be pivoted from an upper closed position shown in  FIG. 1 , in which it is received in an overhead locker housing  18 , into a lower, open loading or unloading position shown in  FIG. 2 . The overhead locker housing  18  is rigidly fastened to a ceiling construction, not shown in the figures, of an aeroplane passenger cabin. 
     The lowerable shell  12  of the overhead locker  10  is connected to the overhead locker housing  18  by means of two retention systems  20  which are each arranged in the region of the side walls  16  of the lowerable shell  12 . Each retention system  20  comprises a guide roller  22  fastened to the overhead locker housing  18 . A cable  24  shown in  FIG. 1  is guided over the guide roller  22  and provides a connection of the lowerable shell  12  to the overhead locker housing  18 . For reasons of clarity, the cable  24  guided over the guide roller  22  is not shown in  FIG. 2 . 
     The overhead locker  10  also comprises a closure mechanism  26  which in its closed position shown in  FIG. 1  holds the lowerable shell  12  of the overhead locker  10  in its upper closed position. In its open position shown in  FIG. 2 , the closure mechanism  26  by contrast allows lowering of the shell  12  into its lower, open loading or unloading position. The closure mechanism  26  comprises an actuating lever  28  which is attached to an outer side of the base  14  of the lowerable shell  12  and is thus easily accessible for example from a central aisle of the aeroplane passenger cabin during operation of the overhead locker  10 . 
     A respective emergency opening device  30 , illustrated in detail in  FIG. 3 to 5 , is provided on the outer faces of both mutually opposing side walls  16  of the lowerable shell  12 . The emergency opening devices  30  are used to allow pivoting of the lowerable shell  12  from its upper closed position shown in  FIG. 1  into its lower, open loading or unloading position shown in  FIG. 2  even in the event of the retention system  20  malfunctioning, which could be triggered for example by jamming of the guided cables  24  or a fire in the overhead locker  10 . 
     The emergency opening devices  30  each have a relatively low depth. The emergency opening devices  30  may therefore be received in an approximately 15 mm wide gap which is present in the closed state of the overhead locker  10  shown in  FIG. 1  between the side walls  16  of the lowerable shell  12  and side walls of the overhead locker housing  18  opposing these side walls  16 . 
     As can best be seen in  FIG. 3 to 5 , the emergency opening device  30  comprises a connecting element  32  and a locking device  34 . The connecting element  32  comprises a cable connection device  36  which is used to fasten the connecting element  32  to the guided cable  24  of the retention system  20 . The cable connection device  36  is provided with an adjusting device which allows fine adjustment of the length of the retention system cable  24  during assembly of the retention system  20  and the emergency opening device  30 . 
     The locking device  34  comprises a base panel  38  which in the assembled state of the emergency opening device  30  is screwed to the side wall  16  of the lowerable shell  12 . A lever  42  pivotal about a journal  40  between a first position (see  FIG. 3 , solid line and  FIG. 4 ) and a second position (see  FIG. 3 , broken line and  FIG. 5 ) is attached to on the base panel  38 . Formed on the lever  42  is a locking nose  44  which, in the first position of the lever  42 , if the locking device  34  of the emergency opening device  30  is connected to the connecting element  32 , cooperates with a locking projection  46  provided on the connecting element  32 . In the second position of the lever  42 , on the other hand, the locking nose  44  formed on the lever  42  releases the locking projection  46  of the connecting element  32 . The lever  32  is pretensioned in its first position by a spring not shown in the figures. 
     The locking device  34  of the emergency opening device  30  also comprises a guide device with first and second guide elements  48 ,  50 . The first and second guide elements  48 ,  50  are formed integrally with the base panel  38  and arranged at a spacing from each other in order to form between them a receiver  52  for the connecting element  32  (see  FIG. 5 ). Formed on the connecting element  32  is a guide rail  54  which is received in a guide groove provided on the second guide element  50  if the connecting element  32  is connected to the locking device  34 . A stop  55  arranged adjacent to the guide rail  54  is also formed on the connecting element  32 . The stop  55  cooperates with a side face  56  of the second guide element  50  if the connecting element  32  is connected to the locking device  34 . 
     As can be seen in  FIG. 1 to 3 , each emergency opening device  30  provided on the side walls  16  of the lowerable shell  12  is partially surrounded by a cover element  57  fastened to the respective side wall  16 . As may best be seen in  FIG. 3 , the cover element  57  is configured in such a way that actuation of the lever  42  of the locking device  34  is not affected. A window is formed in the cover element  57  which allows the operating state of the emergency operating device  30  to be checked, without disassembly of the cover element  57  being necessary. 
     Finally, the emergency opening device  30  comprises a sliding block  58  for sliding guidance of a flat article which, as has yet to be described, can be used to move the pivotal lever  42  of the locking device  34  between its first and its second position. The sliding block  58  is attached to a projection (not shown in the figures) which extends substantially perpendicularly to the outer face of the side wall  16  of the lowerable shell  12  and is positioned such that, on a displacement between its first and second positions, the lever  42  slides over a surface  60  of the sliding block  58 . Alternatively, the sliding block  58  of the emergency opening device  30  may also be formed integrally with the cover element  57  or be fastened thereto. 
     The function of the overhead locker  10  and of the emergency opening device  30  will be described in more detail hereinafter. During normal operation of the overhead locker  10  each emergency opening device  30  makes a connection between the lowerable shell  12  of the overhead locker  10  and the guided cable  24  of the associated retention system  20  and thus the overhead locker housing  18 . 
     During assembly of the emergency opening device  30  the base panel  38  of the locking device  34 , with the lever  42  and the first and second guide elements  48 ,  50 , is firstly screwed to the outer face of the side wall  16  of the lowerable shell  12 . Furthermore, the sliding block  58  is attached to the projection extending substantially perpendicularly to the outer face of the side wall  16  of the lowerable shell  12 . The last-mentioned assembly step may be omitted if the sliding block  58  is, as mentioned above, formed integrally with the cover element  57  or is fastened thereto. 
     Thereafter, the connecting element  32  connected to the guided cable  24  of the retention system  20  via the cable connection device  36  is introduced into the locking device  34  such that the guide rail  54  formed on the connecting element  32  is received in the guide groove formed on the second guide element  50 . The connecting element  32  is displaced relative to the locking device  34  in the direction of the sliding block  58  until the stop  55  formed on the connecting element  32  abuts the side face  56  of the second guide element  50  and the locking nose  44  formed on the lever  42  of the locking device  34  audibly engages with the locking projection  46  provided on the connecting element  32 . Finally, if required, the length of the guided cable  24  of the retention system  20  may also be finely adjusted by means of the adjusting device. 
     During normal operation of the overhead locker  10 , the closure mechanism  26  is opened by actuation of the actuating lever  28  to open the overhead locker  10 , so the lowerable shell  12  can be pivoted from its upper closed position into its lower, open loading or unloading position. In the process the emergency opening device  30  remains in its locked position in which the connecting element  32  is connected to the locking device  34 . 
     If it is not possible to open the overhead locker  10  owing to malfunctioning of one retention system  20 , or both retention systems  20 , which can be triggered for example by jamming of a guided cable  24 , or both guided cables  24 , or a fire in the overhead locker  10 , by simply actuating the locking mechanism  26 , the lowerable shell  12  of the overhead locker  10  can be moved by simultaneously actuating the closure mechanism  26  and the emergency opening device  30  from its upper closed position into its lower, open loading or unloading position. To actuate the emergency opening device  30  a flat article, such as a credit card or a spoon, is introduced into a gap between adjacent overhead lockers  10  in an aeroplane passenger cabin and the lever  42  of the locking device  34  is displaced from its first position into its second position. The movement of the flat article is in the process guided by the sliding block  58 , so proper actuation of the lever  42  is ensured although the person triggering the emergency opening device  30  cannot see the device  30 . 
     By displacing the lever  42  from its first position into its second position the locking nose  44  formed on the lever  42  disengages from the locking projection  46  provided on the connecting element  32 , so the connection between the connecting element  32  and the locking device  34  is broken. Consequently the connection between the lowerable shell  12  and the overhead locker housing  18  is also broken, so the lowerable shell  12  of the overhead locker  10  is moved from its upper closed position into its lower, open loading or unloading position as a result of gravity. Movement of the lowerable shell  12  is limited by what are referred to as end stops, so uncontrolled dropping of the shell  12  is avoided. 
     As the overhead locker  10  is provided with two retention systems  20  and emergency opening devices  30  each arranged in the region of the mutually opposing side walls  16  of the lowerable shell  12 , if required just one emergency opening device  30  can be actuated, so the lowerable shell  12  of the overhead locker  10  is separated from only one retention system  20 , while it remains connected to the other retention system  20 . 
     The locking device  34  of the emergency opening device  30  is configured in such a way that it can be repeatedly moved between its locked position and its unlocked position by moving the lever  42  between its first and second positions. After triggering the emergency opening device  30  the device  30  may therefore easily be made ready for operation again by firstly detaching the cover element  57  from the side wall  16  of the lowerable shell  12  and subsequently connecting the connecting element  32  to the locking device  34  of the emergency opening device  30  again. Once the cover element  57  is repositioned the emergency opening device  30  is ready for operation again.