Abstract:
The invention relates to a headrest for a vehicle, a method for producing a headrest, and a vehicle seat comprising a headrest. The headrest is provided with a body ( 2 ) and a holding element ( 3 ). A filling material ( 23 ) is provided between a connection part ( 22 ), used to connect the holding element ( 3 ) to the headrest body ( 2 ), and a cover ( 21 ). The connection part ( 22 ) and the cover ( 21 ) define an essentially tight space in relation to the filling material ( 23 ) when the filling material ( 23 ) is in the essentially liquid processing state thereof.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     None. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a headrest for a motor vehicle. 
     2. Related Art 
     Such headrests are generally known. In particular with headrests for vehicles, it is already known that, between an outer cover and an inner connection part for attaching the headrest to a headrest holding element, in particular in the form of headrest rods, a filling material is arranged in the form of a foam which provides the required stability, on the one hand, for the headrest and which, on the other hand, may be easily shaped and has a low weight. 
     In known headrests it is provided, for example, that a preformed foam body is used to fill the headrest body. For assembling and shaping the headrest and/or individual parts thereof, the foam body requires a relatively large number of production and processing steps, so that such a production method for headrests is very complicated and costly. 
     A method for producing seats is known from DE 689 02 955 T2, in which foam padding is produced by an “in-situ foaming method” and/or PIP (pour-in-place) method. Advantageously, with this method the production of the foam padding may firstly be carried out, on the one hand, more rapidly and, on the other hand, that the production may be carried out with fewer steps and thus more cost-effectively. 
     Directly applying the PIP method to headrests, however, leads to problems due to the specific conditions of such headrests, in particular if the headrest body is intended to be provided to be movable, for example tiltable, relative to the headrest holding element. 
     The object of the invention, therefore, is to provide a headrest for a vehicle which may be produced easily, rapidly and at relatively low cost and which, however, has a maximum degree of attractiveness and functionality and, in particular, avoids the drawbacks of the prior art. 
     SUMMARY OF THE INVENTION 
     The object is achieved according to the invention by a headrest for a vehicle, in particular for a motor vehicle, the headrest having a headrest body and a headrest holding element, a cover being at least partially provided on the outer face of the headrest body, a connection part being provided inside the headrest body for connecting the headrest holding element to the headrest body, a filling material, in particular a foam, being arranged between the connection part and the cover, the filling material being provided in substantially liquid form in its processing state, and the connection part and the cover defining a substantially sealed space relative to the filling material in its processing state. It is, therefore, possible also to use PIP foaming methods, which are known in principle, for headrests, such headrests having the ability to adjust the inclination of the headrest body relative to the headrest holding element, similar to headrests which are conventionally produced in a complex manner. According to the invention, this is achieved by sufficient sealing of the connection part relative to the inside of the connection part receiving the headrest holding element, on the one hand, and sufficient sealing between the cover and the connection part, on the other hand, relative to the filling material in its processing state. 
     In the sense of the invention, by the term “processing state” of the filling material is denoted the state of the filling material in which the filling material is found when used in the production process. The processing state of the filling material is thus substantially characterized by a specific viscosity of the liquid representing the filling material in its processing state. The foaming time and/or the curing time of the filling material are considered as further parameters of the processing state with regard to the sealing of the space. 
     In the sense of the present invention, the term “sealed space” is understood to be that the filling material in its processing state, i.e. before its cured and/or foamed final state, which it has during the life of the headrest, does not escape to any considerable degree from the sealed space, in particular into the inside of the connection part and/or between the connection part and the cover. 
     According to one embodiment of the invention, the cover may be arranged substantially on the entire outer face of the headrest body, in particular also in the region of the outlet of the headrest holding element from the headrest body. As a result, it is possible to provide the entire headrest and/or in particular the headrest body with a particularly uniform and thus attractive exterior, by the headrest body, in particular also in its lower region where the outlet of the headrest holding element from the headrest body is located, being surrounded almost completely by the cover. Moreover, as a result, the headrest according to the invention may also be designed more safely, as for example an additional covering part is avoided in the region of the outlet of the headrest holding element from the headrest body. It is possible, for example, for such a covering part to be detached from the headrest in crash situations, and thus endanger passengers of the vehicle or, however, it is possible for such a covering part to shatter and thus also represent a danger to passengers of the vehicle. 
     It is further possible that the connection part has an internal volume for receiving the headrest holding element and that, relative to the filling material in its processing state, the part of the connection part coming into contact with the filling material is sealingly provided relative to the internal volume. Moreover, the cover may extend at least partially in the region of one edge of the connection part located in the region of the outlet of the headrest holding element, the edge being provided such that the cover may sealingly bear against the edge. As a result, as a whole it is possible by simple means to ensure both a simple, rapid and cost-effective producibility of the headrest according to the invention and, on the other hand, to accept no compromises as regards the visual design of the headrest or its functional value, namely with regard to its ability to be adjusted for comfortable positioning. 
     A further subject of the present invention is a method for producing a headrest according to the invention, the headrest holding element and the connection part being arranged inside the cover and subsequently the filling material being introduced in its processing state into the space between the cover and the connection part and adopting its final state there. 
     The final state is defined in the sense of this invention as that state of the filling material which the filling material has after its shaping and/or in particular after its foaming, i.e. during the entire life of the headrest. The final state of the filling material is substantially characterized by the foam being fully polymerized. 
     The advantage of the method according to the invention is that it may be carried out particularly easily, rapidly and cost-effectively, so that the headrest produced thereby may also be produced, in particular, very cost-effectively and very rapidly. 
     It is advantageous that, at least whilst the filling material introduced into the headrest is in its processing state, the cover is pressed by means of a tool against the edge of the connection part. As a result, it is possible by simple means to create a seal of the space which is intended to be filled with the filling material and yet to enclose the headrest completely with the cover. 
     A further subject of the present invention is a vehicle seat with a headrest according to the invention, in which the headrest is provided to be adjustable relative to the seat, substantially in a main extension direction of the headrest holding element. As a result, it is possible that the headrest may be adjusted in four adjusting directions, namely both upwards and downwards in the main extension direction of the headrest holding element and also may be tilted to the front and/or to the rear. Such a fourfold adjustable headrest particularly meets the comfort requirements of users of current motor vehicles. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention is described in more detail hereinafter with reference to embodiments shown in the drawings, in which: 
         FIG. 1  shows a principal view of a headrest according to the invention, in which the headrest body is provided to be tiltable relative to a headrest holding element, 
         FIG. 2  shows a first embodiment of the lower part of a headrest according to the invention, 
         FIG. 3  shows a partially cut-away view of the headrest body of the first embodiment, 
         FIGS. 4   a - 4   c  show the essential elements of the headrest in the inside of the headrest body in the first embodiment of the headrest according to the invention, 
         FIG. 5  shows an external view of the finished headrest in the first embodiment of the headrest according to the invention and 
         FIG. 6  shows the lower part of the headrest body of a second embodiment of the headrest according to the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A headrest  1  is shown in  FIG. 1  with a headrest body  2  and a headrest holding element  3 . The headrest body  2  and the headrest holding element  3  according to the invention are movably, in particular tiltably, connected together, which is indicated in  FIG. 1  by the double arrow  33 . In a headrest  1  according to the invention, the headrest body  2  comprises, in particular, a cover  21 , a connection part  22  as well as a filling material  23  which is provided, in particular, as a foam material and/or is shown in its final state as a foam material. In a processing state of the filling material  23 , the filling material is provided in substantially liquid form and is filled into a space  25  between the cover  21  and the connection part  22 . In this connection, according to the invention the space  25  is provided to be sealed both against an emergence of the filling material  23  in its processing state into the internal volume  27  of the connection part  22  and also between the cover  21  and the connection part  22 . A spring  29  and/or clip  29  serves for the mechanical connection and the implementation of the tiltability between the headrest holding element  3  and the headrest body  2 , in particular the connection part  22 . 
       FIG. 2  shows the lower part of a first embodiment of the headrest body  2 . The space  25  is, in turn, filled up with the filling material  23  between the cover  21  and the connection part  22 , the headrest holding element  3  as well as its tiltability (double arrow  33 ) being also indicated in  FIG. 2 . The connection part  22  comprises a fastening means  26  for the cover  21 , visible in the left-hand part of  FIG. 2 . In the right-hand part of  FIG. 2 , the cover  21  merely bears against a specific profile of the connection part  22 , in particular against one edge  28  of the connection part  22 , and/or is pressed by means of a tool, not shown, during the production process, such that in the region of the edge  28  the filling material  23  in its processing state is not able to escape or at least not to any considerable degree. The space  25  is, therefore, also sealed at this point. The edge  28  is designed such that it has a relatively small bearing surface towards the cover  21 , so that merely a small force of a tool, not shown in the figures, is sufficient during the production of the headrest according to the invention, in order to provide sealed behavior at the position of the edge  28  on the cover  21  relative to the filling material  23  in its processing state. 
     In  FIG. 3 , the first embodiment of the headrest body  2  according to the invention is shown in partially cut-away form, i.e. without the cover  21 . In this case, the connection part  22 , the fastening means  26  as well as the clip  29  and/or the spring  29  are visible. Moreover, a fastening element  32 , in particular in the form of a screw, is shown for fastening the connection part  22  to the clip  29  and/or the spring  29 . 
     The individual parts inside the cover  21  of the headrest  1  are shown in  FIGS. 4   a - 4   c .  FIG. 4   a  shows the headrest holding element  3  which also partially projects from the headrest body  2 , (see  FIGS. 1 to 3 ), the connection part  22 , the spring  29  and/or the clip  29  as well as the fastening element  32  in the disassembled state.  FIGS. 4   b  and  4   c  show the headrest holding element  3 , the connection part  22 , the spring  29  and/or the clip  29  as well as the fastening element  32  in the assembled state. The connection part  22  is shown in  FIGS. 4   a - c  in the folded-up form, namely with a main part  221  and a subsidiary part  222  which may be folded onto the main part  221 . For making the headrest  1  according to the invention, the headrest holding element  3  is inserted into the connection part  22  and subsequently the subsidiary part  222  is folded down onto the main part  221 . In this case, the connection part  22  is designed such that when the subsidiary part  222  is closed (folded down), a shape which is sealed relative to an internal volume  27  of the connection part  22 , not shown in  FIGS. 4   a - 4   c , may be produced relative to the filling material  23  in its processing state. As a result, according to the invention, with the production method of the headrest  1  according to the invention (PIP method) the filling material  23  is not able to enter the internal volume  27  of the connection part  22  or at least not to any considerable degree, which could lead to preventing the tiltability of the headrest holding element  3  relative to the connection part  22  and thus relative to the headrest body  2 . 
     In  FIG. 5  the headrest body  2  and the headrest holding element  3  are shown in their finished form, the cover  21  being visible at the outlet  31  of the headrest holding element  3  from the headrest body  2 . As a result, the headrest  1  according to the invention gains a particularly attractive exterior. 
     According to the invention, in the known manner, the term “cover  21 ” also allows for a lamination and/or a laminate attached to the inside of the cover  21 , so that the filling material  23  does not penetrate the fabric of the cover  21 . According to the invention, filling material  23 , in particular in polyurethane foam, is provided, other materials, however, also being suitable, in particular those which are conventionally used in the PIP method. To this end, reference is made to the publication DE 689 02 955 T2 and this is incorporated as a reference and part of this disclosure. 
     In such a headrest  1  according to the invention, the requirements of the ECE  17  and FMVSS 202 standards are fulfilled. 
     In  FIG. 6 , the lower part of a headrest body  2  is shown according to a second embodiment of the headrest  1 , a covering element  34 , in particular made of plastics material and/or synthetic material, being provided in the region of the outlet  31  of the headrest holding element  3  and a fastening means  26  being provided on both sides of the connection part  22  for fixing the cover  21 . 
     The cover  21  is connected to the connection part  22  and namely by means of the fastening means  26  along the entire lower periphery of the connection part  22 , the connection part  22  having a substantially bell-shaped form. 
     The foregoing invention has been described in accordance with the relevant legal standards, thus the description is exemplary rather than limiting in nature. Variations and modifications to the disclosed embodiment may become apparent to those skilled in the art and fall within the scope of the invention. Accordingly the scope of legal protection afforded this invention can only be determined by studying the following claims. 
     LIST OF REFERENCE NUMERALS 
     
         
           1  Headrest 
           2  Headrest body 
           3  Headrest holding element 
           21  Cover 
           22  Connection part 
           23  Filling material 
           25  Space 
           26  Fastening means 
           27  Internal volume 
           28  Edges 
           29  Spring and/or clip 
           31  Outlet of the headrest holding element 
           32  Fastening element 
           33  Double arrow 
           34  Covering element 
           221  Main part 
           222  Subsidiary part