Abstract:
An emergency release device for a trunk of a vehicle includes an arrestor device for limiting an opening movement of the trunk, a trunk lock and a coupling module including first and second coupling elements, each shiftably supported in the coupling housing, wherein the first and second coupling elements respectively operatively couple an emergency actuation device of the vehicle to the arrestor device, and an actuation device of the vehicle to the trunk lock, and are detachably coupled to each other during a first stroke of the first coupling element caused by an actuation of the emergency actuation device, wherein the first stroke causes the second coupling element to open the locking device and causes the first coupling element to perform an idle stroke relative to the arrestor device, and wherein the coupling between the first and second coupling elements is released in response to a second stroke advancing past the first stroke and is caused by the actuation of the emergency actuation device.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
       [0001]    This application claims the priority of German Patent Application, Serial No. 10 2011 120 188.6, filed Dec. 5, 2011, pursuant to 35 U.S.C. 119(a)-(d), the disclosure of which is incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    The invention relates to an emergency release device for a vehicle trunk of a vehicle. 
         [0003]    The following discussion of related art is provided to assist the reader in understanding the advantages of the invention, and is not to be construed as an admission that this related art is prior art to this invention. 
         [0004]    With an emergency release device such as disclosed in DE 10 2006 012 062 A1, a person who is trapped in a front side trunk of a vehicle can free herself by actuating an emergency release device for release of the front hood. An emergency release system is for example mandated according to a US provision FMVSS 401 for the vehicle market in the United State of America. 
         [0005]    The known emergency release device according to DE 10 2008 012 062 A1 relates to a locking device for a front hood of a motor vehicle with a rotary latch which interacts with a lid side locking arm, which rotary latch is securely held in a locked position by means of a ratchet and with a arrestor hook which can be brought in engagement with a catch element after moving the ratchet in an open position, through which arrestor hook the hood can be held in a holding position, wherein the arrestor hook can be moved from the holding position into an open position in which the lid can be completely opened. 
         [0006]    In this known locking device, the rotary latch and the arrestor hook are configured as separate parts, so that the ratchet of the rotary latch and the arrestor hook can be successively actuated via a common Bowden cable. 
         [0007]    With this known emergency release device it is supposed to be possible to easily also actuate the arrestor hook via the Bowden cable, with which the ratchet of the rotary latch is moved in to a releasing open position. 
         [0008]    For this, the strand of the Bowden cable is connected with the ratchet and its sheath with the arrestor hook of the trap device, wherein the sheath of the Bowden cable is held fixed in position on the arrestor hook, while its strand which is connected to the ratchet is moved relative to the sheath or the arrestor hook. After the ratchet is moved into its open position by the movement of the strand the sheath can in a second step be moved relative to the strand and according a movement of the arrestor hook into its open position results. 
         [0009]    Further, a locking device which is formed by an electromagnet is provided in this known emergency release device, with which the actuation of the arrestor hook can be prevented in dependence on the driving speed of the motor vehicle. 
         [0010]    It would be desirable and advantageous to provide an improved emergency release device of the aforementioned type. 
       SUMMARY OF THE INVENTION 
       [0011]    According to one aspect of the present invention, an emergency release device for a trunk of a vehicle, includes a locking device, an arrestor device limiting an opening movement of the trunk, wherein the arrestor device includes an arrestor hook for reversing said limiting, an emergency actuation device arranged in the trunk and being operatively connected to the arrestor device and the locking device, wherein the emergency actuation device when actuated successively opens the locking device and releases the arrestor device, an actuation device, and a coupling module including a coupling housing, and first and second coupling elements shiftably supported in the coupling housing, wherein the first coupling element operatively couples the emergency actuation device to the arrestor device, wherein the second coupling element operatively couples the actuation device to the locking device, wherein during a first stroke of the first coupling element caused by an actuation of the emergency actuation device, the first and second coupling elements are releasably coupled to each other, wherein the first stroke causes the second coupling element to open the locking device, and is an idle stroke in relation to the arrestor device, and wherein in response to a second stroke, caused by the actuation of the emergency actuation device and extending past the first stroke, the first and second coupling elements are released from each other, and the first coupling element releases the arrestor device. 
         [0012]    In this solution according to the invention, a sequential opening of the locking device of the trunk and the release of the arrestor device also occurs according to the known emergency release device according to DE 10 2006 012 A1, however, the actuating forces which have to be exerted on the emergency release device are significantly smaller because after a first stroke, which only leads to the opening of the trunk lock, the second coupling element is de-coupled and thus only a force for the release of the arrestor device is required for the further actuation. 
         [0013]    According to another advantageous feature of the invention, the coupling housing further includes a holding magnet, wherein upon completion of the second stroke an anchor plate of the holding magnet is connected with the first coupling element and rests against the holding magnet. This achieves a latching engagement of the arrestor device in the open state, thereby preventing a reengagement for example of an arrestor hook with an associated catch element. 
         [0014]    According to another advantageous feature of the invention, second coupling element has a pivotally supported coupling lever which is spring loaded in a direction of the first coupling element. This represents a simple mechanical solution for such a coupling between the two coupling elements. For this purpose, the first coupling element preferably has a detent nose for coupling with the second coupling element, with the end of the coupling lever engaging behind the detent nose, wherein the coupling housing is configured with a stop which at the beginning of the second stroke of the first coupling element causes a pivoting of the coupling lever out of its engagement behind the detent nose of the first coupling element. 
         [0015]    According to another advantageous feature of the invention, an actuation of the actuation device causes a shifting of the second coupling element in the coupling housing independent of the first coupling element for opening the locking device. 
         [0016]    This is advantageously achieved according to a refinement in that the shifting of the second coupling element causes a pivoting back of the coupling lever for de coupling from the first coupling element in that the end of the coupling lever slides along the first coupling element and the stop of the coupling housing. 
         [0017]    According to another advantageous feature of the invention, the first coupling element is connected by non positive engagement with the arrestor device via a pulling-force transmitting pulling means, preferably a Bowden cable. 
         [0018]    According to another advantageous feature of the invention, the first coupling element is pre-tensioned in the coupling housing by a spring element in a direction of a pulling force defined by the emergency release device. 
         [0019]    Particularly advantageous is when in an embodiment of the invention the holding magnet is configured as electromagnet and is supplied with current in dependence on the speed of the vehicle, in order to cause a falling off of the anchor plate from the holding magnet and to cause a shifting of the first coupling element into its starting position as a result of the pretension of the spring element. This allows bringing an arrestor hook again into its catch position when at released arrestor device the vehicle starts driving and exceeds a predetermined speed. 
         [0020]    In addition, for reasons of safety it is also provided according to a refinement of the invention, to configure the coupling housing with an electrically actuatable locking element which in dependence on the speed of the vehicle prevents a shifting of the first coupling element past the first stroke. 
         [0021]    According to another advantageous feature of the invention, the first coupling element is connected by non positive engagement with the arrestor device via a pulling-force transmitting pulling means, and the second coupling element is connected by non positive engagement with the actuation device via a pulling-force transmitting pulling means 
         [0022]    According to another advantageous feature of the invention, the second coupling element is configured for non engaging movement in relation to the pulling-force transmitting pulling means by virtue of coupling to the first stroke 
         [0023]    According to another advantageous feature of the invention, the second coupling element is connected by non positive engagement with the trunk lock via a pulling-force transmitting pulling means. 
         [0024]    As pulling means, a Bowden cable with a pulling grope and a pulley sleeve can be used for the emergency release device according to the invention. 
         [0025]    According to another advantageous feature of the invention, for forming the idle stroke, an end of the pulling cable is provided with a cable nipple which is supported in an oblong groove which extends in a pulling direction of the pulling means for shifting along a length which corresponds to an extent of the idle stroke. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0026]    Other features and advantages of the present invention will be more readily apparent upon reading the following description of currently preferred exemplified embodiments of the invention with reference to the accompanying drawing, in which: 
           [0027]      FIG. 1  shows a schematic representation of an emergency release device with a coupling module as exemplary embodiment according to the invention, 
           [0028]      FIG. 2  shows a schematic representation of the coupling module according to  FIG. 1  in an open front view, and 
           [0029]      FIG. 3  shows a schematic representation of the coupling module according to  FIG. 1  in an open rear view. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0030]    Throughout all the Figures, same or corresponding elements are generally indicated by same reference numerals. These depicted embodiments are to be understood as illustrative of the invention and not as limiting in any way. It should also be understood that the drawings are not necessarily to scale and that the embodiments are sometimes illustrated by graphic symbols, phantom lines, diagrammatic representations and fragmentary views. In certain instances, details which are not necessary for an understanding of the present invention or which render other details difficult to perceive may have been omitted. 
         [0031]    Turning now to the drawing, and in particular to  FIG. 1 , there is shown an emergency release device  1  for a front hatch of a vehicle for example a motor vehicle and includes as central element a coupling module  10 , which by means of pulling means which are configured as Bowden cables  43 ,  45 ,  47 ,  49  form an operative connection between an emergency release device  5  arranged in a trunk  2  of the vehicle and an actuation device  6  on the one hand, and on the other hand with a trunk lock  3  and a arrestor device  4 , schematically indicated as lock and arrestor hook. A person which is trapped in the trunk can open the trunk lock  3  by actuating the emergency release device  5  and release the arrestor device  4 , so that the front hatch can be fully opened and the trapped person can free herself from this trunk. 
         [0032]    The construction and the function of such a trunk lock  3  is known which for example consists from a vehicle side lock trap and a hatch side locking part. For opening the trunk lock  3 , the lock trap is connected by means of a manually actuatable release device  7  which is arranged in the passenger compartment of the vehicle, as for example shown in  FIG. 1 . The release of the trunk lock  3  can also be caused electrically by a control device  9  of the vehicle by its actuation of its actuation device  6  which is configured as actuator. For this, the control device  6  is connected to this electric lock release device  6  via a data line  9   a . The opening of the trunk lock  3  is in this case caused by a control element which is arranged in the passenger compartment. 
         [0033]    The construction and the function of a arrestor device  4  are also known and are formed for example by a hood-side arrestor hook and a corresponding vehicle-side arrestor element. The arrestor hook engages behind the arrestor element and thereby prevents an opening of the front hood which extends past a small initial opening. In order to remove the movement limitation the arrestor hook is actuatable from outside the trunk via a corresponding mechanic. The transition of the arrestor hook from its opening-limiting position into its open position is for example caused by means of an arrestor hook lever which is connected to the emergency release device  5 , as for example described in the previously mentioned DE 10 2006 012 062 A1. 
         [0034]    In combination,  FIGS. 1 and 2  show the construction of the coupling module  10  from a first coupling element  20  and a second coupling element  30 , when the first and second coupling element  20  or  30  are arranged in a coupling housing  40 . 
         [0035]    For receiving these longitudinal and square shaped coupling elements  20  and  30  in this coupling housing  40  the coupling housing  40  is configured with two longitudinal chambers  41  and  42  which are adjusted to the shape of the coupling elements  20  and  30 , in which chambers  41 ,  42  a coupling element  20  or  30  is supported for shifting in longitudinal direction x. 
         [0036]    The first coupling element  20  is connected by none positive engagement to the emergency release device  5  via the pulling rope of the Bowden cable  43  and with its other end connected by none positive engagement to the arrestor device  4  also via the pulling rope of the further Bowden cable  45 . With this, the two Bowden cables  43  and  45  together with the first coupling element  20  form a pulling force transmission path between the emergency actuation device  5  and the arrestor device  4 . Further, the first coupling element  20  is pre-tensioned in a pulling direction F, by means of a return spring  24 . 
         [0037]    The end of the pulling rope of the Bowden cable  43  or  45  is formed by a spherical rope nipple  44  or  46 . The rope nipple  44  of the Bowden cable  43  is received by a nipple receptacle  21  of the first coupling element which nipple receptacle is shaped corresponding to the spherical shape of the rope nipple  44  and fixed, while the rope nipple  46  of the Bowden cable  45  is supported in a nipple receptacle  22  of the coupling element  20  which nipple receptacle  22  is configured as longitudinal groove, for shifting in this longitudinal groove over the length of this longitudinal groove. This support of the rope nipple  46  in this longitudinal groove  22 , enables an idle stroke by the first coupling element  20  in relation to the arrestor device  4  corresponding to the length of the longitudinal groove  22 . 
         [0038]    The second coupling element  30  is connected with the actuation device  6  with one of its ends via the pulling cable of the Bowden cable  47 , in that a spherical cable nipple  48  of the pulling cable is supported in a nipple receptacle  31  which is configured as oblong groove, for shifting along this oblong groove, wherein the length of this oblong groove  31  essentially corresponds to the length of the oblong groove  22  of the first coupling element  20 . The other end of the second coupling element  30  is connected with the trunk lock  3  via the pulling cable of the Bowden cable  49 , wherein also in this case, a spherical rope nipple  50  of the end of the pulling rope of this Bowden cable  49  is received by a nipple receptacle  32  which is adapted to the spherical shape of the rope nipple  50 , and fixed in this second coupling element  30 . The two Bowden cables  47  and  49  together with the second coupling element  30  also form a pulling force transmission path between the actuation device  6  and the trunk lock  3 . 
         [0039]    The first and second coupling elements  20  and  30  are shown in the coupling module  10  according to  FIG. 2  in their starting position, in which the trunk lock  3  is closed and the arrestor device  3  is in a none actuated position. In this position, the first and second coupling element  20   30  respectively rest against the end sides  51  and  52  of the two chambers  41  and  42  through which end sides  51 ,  52  the two Bowden cables  45  and  49  are guided to the trunk lock  3  and the arrestor device  4 . Due to the return spring  24 , the first coupling element  20  is constantly pushed in the direction of its starting position shown in  FIG. 2  during a shifting movement in the direction of the pulling force F z . 
         [0040]    The second coupling element  30  is configured with a coupling lever  33  which is pivotal about a pivot axis  34  and which is pre-tensioned in the direction of the first coupling element  20  by means of a shank spring  36 , wherein the pivot axis  34  is arranged so that in the positions shown in  FIG. 2 , the first and second coupling elements  20  and  30  the end  35  of the coupling lever  33  is supported against a detent nose  23  of the first coupling element in thereby coupled to the first coupling element in such a manner that in case of a movement of the first coupling element  20  in x-direction, i.e. in pulling direction F z  with regard to the emergency actuation device, the second coupling element  30  is moved along. 
         [0041]    In the following, the function of the first and second coupling elements  20  and  30  when actuating the emergency actuation device  5  and the actuation device  6  is explained. 
         [0042]    When actuating the emergency actuation device  5 , the pulling force F z  generated thereby is transferred to the first coupling element  20  and due to the coupling with the second coupling element  30  also to the second coupling element  30 , whereby the trunk lock  3  is opened. The shift required therefore referred to as first stroke, determines the position of a stop  53  of the coupling housing  40  for the coupling lever  33  of the second coupling element  30 . This stop  53  causes the coupling lever  33  which is pre-tensioned by the shank spring  36 , to be pivoted out of the detent nose at the end of the first stroke due to a further shifting movement of the first coupling element  20 , so that the second coupling element  30  is decoupled from the first coupling element  20  and thus does not carry out any further shifting movements. 
         [0043]    During the first stroke of the first coupling element  20  the latter carries out an idle stroke relative to the Bowden cable  45 , because the rope nipple  46  of the first coupling element is supported in the oblong groove  22  and therefore moves relative to the first coupling element  20  from an end of the oblong groove  22  as far as an opposing end of the oblong groove  22  and rests against the opposing end, so that a pulling force which is generated in a further sequence of movement is also transferred to the pulling rope of the Bowden cable  45 . 
         [0044]    As a result, the rope nipple  46  of the Bowden cable  45  is carried along by the first coupling element  20  past the first stroke via a shifting movement of the second stroke of the first coupling element  20  and thereby the movement transferred to a arrestor hook of the arrestor device  4 , so that thereby at the end of the second stroke, the opening movement of the front hood of the trunk  2  is enabled. 
         [0045]    After the first coupling element  20  has reached its maximal stroke which is formed by the first and second stroke, an anchor plate  55  of a permanent magnet  54 , which anchor plate  55  is connected with the first coupling element  20  rests against the permanent magnet  54  (see  FIG. 3 ) whereby the arrestor device  4  remains released, i.e. the arrestor hook of such an arrestor device  4  remains in the open state. The front hood of the trunk  2  can be opened. For verifying the function of the state of the arrestor device  4  a micro switch  60  (see  FIG. 3 ) is provided which is mounted in the coupling housing  40 , and detects the position of the first coupling element  20 . 
         [0046]    The permanent magnet  54  is configured as electromagnet and mounted in the coupling housing with a mounting plate  56 ; it is capable to hold the anchor plate  55  when not supplied with current. Only a short current pulse is sufficient to repel the anchor plate with the support of the return force of the pre-tensioned return spring  24 . This is used to briefly supply this permanent magnet  54  with current in the state of the released arrestor device  4  when the vehicle starts driving and exceeds a predetermined speed for example 5 km/h as required in the US-Provision FMVSS 401. This automatically causes the arrestor device assumes its starting position, in which its arrestor hook limits the opening movement of the front hatch of the vehicle. 
         [0047]    For this, sensor signals of rotational speed sensor of the vehicle are provided to the control device  9  and via a data line this permanent magnet  54  controlled. 
         [0048]    Further, a stroke magnet  57  which is configured as electromagnet is integrated in the coupling housing  40  together with a ratchet  58  (see  FIGS. 2 and 3 ), which blocks the movement of the first coupling element after its first stroke. In case an actuation of the emergency actuation device  5  is terminated in this state, the first coupling element  20  is pushed into its starting position by the return force of the return spring  24 . Also for this the control device analyses sensor signals of rotational speed sensors of the vehicle and controls the stroke magnet  57  via the data line  9   b , which stroke magnet is configured as bi-stable stroke magnet. This has the advantage that the stroke magnet is not supplied with current in both positions and supply with current is only required for the change from one position into another. In order to detect the position of the stroke magnet  57 , a function monitoring by means of a micro switch which is arranged in the coupling housing  40  can be carried out. 
         [0049]    The usual procedure for opening the trunk lock  3  is that the actuation device  6  which is configured as electric lock release, is controlled by the control device  9 , by which a corresponding pulling force F z  is transferred to the second coupling element  30  and the Bowden cable  49  and as a result the second coupling element  30  is shifted in the direction of the pulling force F. During this movement, the coupling lever  33  is pivoted out of the position in which it rests against the first coupling element  20 , because the end  35  of the coupling lever  33  first slides along the first coupling element  20  and then along the stop  53 , without influencing the second coupling element  20 . 
         [0050]    While the invention has been illustrated and described in connection with currently preferred embodiments shown and described in detail, it is not intended to be limited to the details shown since various modifications and structural changes may be made without departing in any way from the spirit of the present invention. The embodiments were chosen and described in order to best explain the principles of the invention and practical application to thereby enable a person skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. 
         [0051]    What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein: