Abstract:
An accident sensor having a fastening arrangement for a vehicle is provided, for the fastening of the accident sensor, the fastening arrangement allowing an insertion into an opening in a wall and a rotation up to a final position defined by a stop, the fastening arrangement preventing a turning back of the accident sensor in the final position.

Description:
FIELD OF THE INVENTION 
     The present invention relates to an accident sensor. 
     BACKGROUND INFORMATION 
     A sensor module in which the housing of an air-pressure sensor used for sensing side impact is attached to a wall in the vehicle with the aid of fastening arrangement, e.g., screws, is discussed in German patent document DE 199 23 985 A1. German patent document DE 101 06 311 A1 also indicates that an air-pressure sensor is installed in the door, on a partition wall between wet area and dry area in the door. In this instance, a pressure channel projects into the wet area while the air-pressure sensor is situated in the dry area. A sealing cushion is provided, which seals the housing interior from the pressure sensor and also the housing from the partition wall. 
     SUMMARY OF THE INVENTION 
     In contrast, the accident sensor according to the present invention having the features of the independent patent claim has the advantage that fastening arrangement is provided that allow for an insertion through an opening in the wall and then a rotation up to a specific stop that thus defines the final position. In the final position, the fastening arrangement is configured such that a turning back of the accident sensor is prevented and thus a fixed installation is made possible. This configuration makes it possible to avoid expensive screw connections. In the final position, the accident sensor is fastened as intended. 
     The fastening arrangement allows for a very simple and a simultaneously secure installation of the accident sensor. Additional installation safeguards may also be omitted. Such installation safeguards might be a torque monitoring, optical inspections of the rivets, and the like. In particular, a one-handed installation is possible, since the other hand does not have to use a tool. 
     As specified in the related art, the accident sensor is in particular an air-pressure sensor; however, it may also be an acceleration sensor, an environment sensor system, or a structure-borne noise sensor. 
     The fastening arrangement is defined according to the features described herein. They must allow for the insertion of the accident sensor through the opening in the wall and then the rotation, the stop, and the prevention of the turning back out of the final position. Examples for such a fastening arrangement include a modified bayonet lock, which prevents a turning back, for example. 
     A stop may be understood as a mechanical structure that prevents the accident sensor from being able to be rotated further. 
     The measures and further developments specified in the dependent claims allow for advantageous improvements of the accident sensor specified in the independent patent claim. 
     It is particularly advantageous that the fastening arrangement have a mechanical coding that allow for the insertion of the accident sensor in a single angular position. In this manner, the accident sensor is then already correctly oriented for the rotation. This mechanical coding may be achieved by a corresponding forming of the fastening arrangement. For this purpose, it is also possible to use supporting wings, for example, which also have the function of holding the pressure sensor in the installed state, that is, in the final position. In this context, in particular two supporting wings may be provided, and these two supporting wings are then formed differently, having different widths, for example. However, instead of supporting wings, it is also possible to use other structures. 
     In particular, the accident sensor has a sealing arrangement, for example, a sealing ring that then additionally seals the opening. This is advantageous in particular when the air-pressure sensor itself is located in the wet area and the opening leads into the dry area. 
     With regard to their hardness and/or form, the sealing arrangement may advantageously be configured to absorb the retention force, in order to then achieve an optimal force distribution on both sides of the wall in the vehicle door, together with the supporting wings. The hardness may be set by corresponding plasticizers, for example. In silicones that are used as the sealing ring material, different degrees of hardness may be set. This is characterized by the so-called shore index. With regard to the forming of the sealing arrangement, sealing rings may be implemented in a tapered manner or in a broad manner, in order to thus be able to absorb more or less force. 
     The fastening arrangement may have at least one mechanical rib that allows for the accident sensor to be rotated in only one direction after the insertion. Such a rib is formed in a semicircular manner, for example, and thus allows for a tab, which ultimately leads to the locking into place in the final position, to be rotated in only one direction, since the tab would otherwise abut against the rib. This tab may allow a locking into place in the final position, under the influence of a spring force whose restoring force secures the tab in the final position, for example. Thus, the accident sensor is then prevented from turning back out of this final position. 
     The accident sensor is advantageously formed such that the structures of the wall only allow for the cables to be connected to the accident sensor when the accident sensor has reached its final position. For example, this may be achieved by a notch in the wall, which is formed out of sheet metal, for example, so that the notch prevents the possibility of a connection of the cable in a position other than the final position. 
     It is advantageously possible for the accident sensor to have a marking that allows for a detection of the final position. It may be possible for an installer to detect this marking through a boring in the wall only in the final position, for example. This optical marking may be provided in the floor of the sensor, inside of the area sealed by the sealing arrangement, for example. 
     Typically, the notch may be impressed in the door&#39;s sheet metal, so that it mechanically prevents the connector plug from being plugged into the sensor as long as the sensor is not rotated into the final position. 
     Furthermore, it is possible to provide an additional fastening tab on the sensor, in case the secure installation in the vehicle is to be safeguarded by an additional screw or rivet, for example. The additional securing by a screw also allows for the electronic traceability of the correct installation in the vehicle, via a monitoring and recording of the torque, for example. 
     In summary, it is therefore possible for the accident sensor according to the exemplary embodiments and/or exemplary methods of the present invention to satisfy the following criteria according to its characteristics as described herein:
         1. It may only be possible to insert the accident sensor into the opening of the wall in a single angular position.   2. The accident sensor may be rotated in only one direction after being inserted.   3. In the final position, a stop must prevent an over-rotation.   4. The accident sensor must lock into place audibly when it reaches the final position. The acoustic signal is thereby caused by a suitably designed clip.   5. The accident sensor may advantageously be designed such that it may not be detached, or may be detached only with damage, once it has reached the final position.   6. The accident sensor and the fastening arrangement should be designed such that the accident sensor is able to be contacted via cable or mating connectors only when it has reached its final position.   7. The accident sensor may have an additional securing tab that allows for an additional screw connection.       

     The accident sensor&#39;s tab, which locks into place in the final position, is designed as a clip tab. This clip then ensures that the accident sensor may not be rotated out of the final position anymore, or may be rotated out only when the clip is thereby destroyed. 
     Exemplary embodiments of the present invention are illustrated in the drawing and explained in greater detail in the following description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a top view of the accident sensor according to the present invention. 
         FIG. 2  shows a view of the wall having the opening and the notch. 
         FIGS. 3   a ,  3   b  and  3   c  show the installation of the accident sensor. 
         FIGS. 4   a ,  4   b ,  4   c ,  4   d ,  4   e  and  4   f  show the operations of installation of the accident sensor, as well. 
         FIG. 5  shows a lateral view of the installed accident sensor. 
         FIG. 6  shows an additional lateral view of the installed accident sensor. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a top view of accident sensor  1  according to the exemplary embodiments and/or exemplary methods of the present invention, which in this instance is described as an air-pressure sensor for detecting side impact. Alternatively, other accident sensor types are possible, as specified above. Accident sensor  1  has a plug connector piece  10  and a main body  12  in which the pressure sensor element and connected electronics are located. In this instance, the side in the wet area is shown, which has the fastening arrangement. The fastening arrangement is provided inside of a sealing ring  11  made out of the sealing arrangement. In this instance, sealing ring  11  is provided as a ring. It is also possible to provide a rectangular sealing or other suitable forms. In this instance, the fastening arrangement have a disk  13  having supporting wings  15  and  16 , supporting wing  15  being significantly wider than supporting wing  16 . Furthermore, a mechanical rib  14  is shown, which prevents the accident sensor from being rotated in a wrong direction during installation. In addition, a tab  17  is indicated, which will lock into place in the final position, and thus prevents the accident sensor from turning back. Supporting wings  15  and  16  are formed differently in order to preset a mechanical coding so that air pressure sensor  1  may be inserted into the wall through the opening only in one specific angular position since the opening in the wall corresponds to this shape of the supporting wings. In this instance, the fastening arrangement is made out of plastic. Sealing ring  11  is formed out of silicon, as specified above. Other plastic materials are possible. Main body  12  of the air pressure sensor is metallic, it also being possible to use plastic materials in this instance. 
       FIG. 2  shows a view of wall  20  having an opening  21  and a notch  22 , which is impressed into the wall made of sheet metal. With regard to its shape, opening  21  resembles the form of fastening arrangement  41 , which includes  13  through  17 , so that pressure sensor  1  having the fastening arrangement  41  may be passed through opening  21  only in one specific angular position. In the process, pressure sensor  1  is pressed against wall  20 , through the pressing of sealing  11 , for example. Impressed notch  22  prevents electric cables from being connected to plug connector  10  as long as pressure sensor  1  has not yet reached the final position. 
       FIGS. 3   a  through  c  show the installation of the accident sensor according to the exemplary embodiments and/or exemplary methods of the present invention.  FIG. 3   a  shows how the sensor is passed through the opening in wall  30 . In this instance, the view from the side of the wet area in which the pressure sensor is located, for example, is shown. The pressure sensor has a plug connector part  33 , a pressure-entry channel  32 , and a body  31 . In this instance, notch  34  is also shown, which prevents cables from being connected in this installation position. 
     In  FIG. 3   b , which shows the same elements using the same reference numerals, the sensor has now reached the final position and thus has also left notch  34  so that the cables may be connected. A rotation of 90 degrees has taken place. 
       FIG. 3   c  shows the view from the dry area and how fastening arrangement  35  fill in the opening. 
       FIGS. 4   a  through  f  show the different steps during installation of the accident sensor from the dry area side. In this instance as well, identical elements are labeled with the same reference numerals. 
       FIG. 4   a  shows how fastening arrangement  41  are lead through wall  40 . Notch  42  may be seen in cutaway portions. In  FIG. 4   b , fastening arrangement  41 , which can be, for example, a sensor, is rotated, namely in a clockwise manner. Figures c, d, and e show the rotation step by step, until the final position was reached in  FIG. 4   e .  FIG. 4   f  also shows the accident sensor from the back side of the sheet metal, in the locked-in state, in a perpendicular view. 
       FIG. 5  shows a first specific embodiment of the accident sensor according to the present invention in a lateral view. In this instance, the accident sensor is disposed in the wet area, with main body  50  and plug connector part  56 . Sealing  55  seals the opening through wall  51  against the wet area. Fastening arrangement having supporting wings  52  and  53 , in this instance labeled  54 , hold the sensor on wall  51 . But sealing arrangement  55 , in this instance designed as a sealing ring, also absorb a part of the force, as described above. 
       FIG. 6  shows an alternative. Now fastening arrangement  63  are on the wet-area side, with pressure channel device  60  of the air-pressure sensor. Sealing  62  is now on the dry-area side and seals the opening in wall  64  against the dry area. Main body  61  of the air pressure sensor is located in the dry area. The connection to the cables then also takes place there. 
     If the connector part of the air-pressure sensor is located in the wet area, then the cables are also connected there, but through ducts that are provided in the wall in the door anyway, then led further into the dry area.