Abstract:
A tether clip apparatus preventing an A pillar from completely separating from a car body at the time of deploying an airbag, may include a pillar fixing clip fixed to the A pillar, a car body fixing clip configured to be fixed to a car body panel, inserted with the pillar fixing clip, and preventing the A pillar from completely separating from the car body panel while moving within the pillar fixing clip at the time of deploying the airbag, and a metal clip elastically supporting the pillar fixing clip and the car body fixing clip so as not to separate from each other.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Korean Patent Application No. 10-2011-0135790, filed on Dec. 15, 2011 in the Korean Intellectual Property Office, the entire contents of which is incorporated herein for all purposes by this reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the invention 
     The present invention relates to a tether clip preventing an A pillar from completely separating from a car body while forming a gap between the car body and the A pillar when an airbag is operated. 
     2. Description of Related Art 
     As shown in  FIG. 1 , a tether clip according to the related art is provided with a first pre-assembling part  41  and a second pre-assembling part  51  for pre-fixing a pillar fixing clip  40  and a car body fixing clip  50  before an airbag is deployed, wherein the first pre-assembling part  41  is made of plastic and thus, has physical properties that change according to temperature and humidity of the outside environment, to thereby make it difficult to obtain high-level reliability. For example, the material of the first pre-assembling part  41  becomes soft at the time of high temperature, which weakens separation preventing force, but is solid at low temperature, which strengthens the separation preventing force, such that deviation of the separation preventing force negatively affects product reliability. 
     The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. 
     BRIEF SUMMARY 
     Various aspects of the present invention are directed to providing a tether clip with high reliability by implementing the same operating force regardless of the outside environment, and providing a tether clip designed to easily control operating force. 
     In one aspect of the present invention, a tether clip apparatus preventing an A pillar from completely separating from a car body at the time of deploying an airbag, may include a pillar fixing clip fixed to the A pillar, a car body fixing clip configured to be fixed to a car body panel, inserted with the pillar fixing clip, and preventing the A pillar from completely separating from the car body panel while moving within the pillar fixing clip at the time of deploying the airbag, and a metal clip elastically supporting the pillar fixing clip and the car body fixing clip so as not to separate from each other. 
     The pillar fixing clip may include a pillar fixing part provided at an end of the pillar fixing clip and fixed to the A pillar, a first pre-assembling part provided at a middle portion of the pillar fixing clip and extending from the pillar fixing part, wherein the first pre-assembling part is pre-assembled with a second pre-assembling part of the car body fixing clip to regulate a deploying force of the airbag, and a separation preventing part provided at the other end of the pillar fixing clip, wherein the separation preventing part is coupled to a hook of the car body fixing clip at the time of deploying the airbag to prevent the pillar fixing clip from being drawn out after the pillar fixing clip is drawn out by a predetermined distance from the car body fixing clip. 
     The car body fixing clip may include the second pre-assembling part provided at an end thereof and fitted in the first pre-assembling part, the hook provided at the other end thereof and interfering with the separating preventing part of the pillar fixing clip at the time of deploying the airbag to stop a movement of the separation preventing part, and a car body fixing part provided at an outer surface thereof and fixed to the car body panel. 
     The metal clip elastically supports the first pre-assembling part and the second pre-assembling part so as not to separate from each other, such that the firs pre-assembling part and the second pre-assembling part are fixed to each other by elasticity of the metal clip and the first pre-assembling part and the second pre-assembling part are separated from each other when an airbag deploying force is larger than the elasticity of the metal clip at the time of deploying the airbag so as to draw out the pillar fixing clip from the car body fixing clip. 
     Both lateral sides of the second pre-assembling part are provided with slits, such that the second pre-assembling part is provided in a cantilever shape toward an end of the car body fixing clip, wherein an end of the cantilever shape is provided with an inclined surface inclined in a drawing out direction of the pillar fixing clip, and wherein the first pre-assembling part is provided with an inclined surface corresponding to the inclined surface of the second pre-assembling part. 
     The first pre-assembling part is disposed at an inside of the second pre-assembling part, wherein an outer surface of the second pre-assembling part is fitted with an inner surface of the metal clip having a “           ”-letter shape, and wherein the metal clip is fixed to the car body fixing part by fitting a fixing hole provided at the other surface thereof having a “         ”-letter shape in a protrusion provided at the car body fixing part.
     The first pre-assembling part is recessed to form a groove, and the second pre-assembling part is provided with a protrusion so as to be coupled with the groove of the first pre-assembling part. 
     A top portion of the car body fixing clip is provided with the slits at the left and right thereof so as to form the second pre-assembling part having an upward cantilever shape. 
     An outer surface of the car body fixing clip is provided with a protrusion, and the metal clip is provided with a fixing hole so as to fit the protrusion therein. 
     The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram showing a tether clip according to the related art. 
         FIGS. 2 to 4  are perspective views each showing a pillar fixing clip, a car body fixing clip, and a metal clip of a tether clip according to the exemplary embodiment of the present invention. 
         FIG. 5  is an assembling perspective view each showing the pillar fixing clip, the car body fixing clip, and the metal clip of the tether clip according to the exemplary embodiment of the present invention. 
         FIG. 6  is a cross-sectional view of the tether clip of  FIG. 5  to show the first and second pre-assembling parts and an inclined surface (a metal clip is not shown). 
         FIG. 7  is a cross-sectional view of a tether clip of  FIG. 5  to show a separation preventing part and a hook. 
     
    
    
     It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. 
     In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that the present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims. 
     Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to  FIGS. 2 to 7 . 
     The exemplary embodiment of the present invention relates to a tether clip for preventing an A pillar from completely separating from a car body when an air bag is deployed. The tether clip includes a pillar fixing clip  10 , a car body fixing clip  20 , and a metal clip  30 . 
     The pillar fixing clip  10  is pre-assembled by being fitted in a hollow part of the car body fixing clip  20  and is drawn out by a predetermined length from a car body fixing clip at the time of deploying an airbag and then, stops, such that the A pillar is deployed to some degree from the car body. By this configuration, a space to deploy and come out the air bag is secured. 
     A detailed configuration of the tether clip is as follows. 
     First, describing the pillar fixing clip, as shown in  FIG. 2 , a top end of the pillar fixing clip is provided with a T-shaped pillar fixing part  11  fixed to the A pillar and a bottom part thereof is provided with a flange shape part. When the pillar fixing part  11  is fixed to the A pillar, the flange shape part is closely attached to the A pillar. 
     Further, a bottom portion of the flange shape part of the pillar fixing clip is provided with the first pre-assembling part  12  provided with an inclined surface  121  inclined outwardly downwardly in a state in which the first pre-assembling part  12  is partially depressed. The bottom portion of the first pre-assembling part  12  is provided with a rectangular pillar having a predetermined length. The length of the rectangular pillar is approximately equal to an interval at which the A pillar is separated from the car body at the time of deploying the airbag or a distance at which the pillar fixing clip  10  is drawn out from the car body fixing clip  20 . 
     That is, the first pre-assembling part  12  is depressed to form a groove  60  and the second pre-assembling part  21  is provided with a protrusion  65  so as to be coupled with the groove  60  of the first pre-assembling part  12 . 
     Finally, a bottom end of the pillar fixing clip is provided with a separation preventing part  13  having a double hook shape protruded outwardly to both sides thereof in a shape of the rectangular pillar. The separation preventing part  13  is horizontally disposed with respect to a mounting direction of the inclined surface  121 , which is to prevent the separation preventing part  13  from interfering with the second pre-assembling part  21  to be described below when the pillar fixing clip  10  is drawn out from the car body fixing clip  20 . On the other hand, the reason is that it is more advantageous in design to form a hook  25  deviating from a shaft line than to form the hook  25  on the same vertical shaft line as the second pre-assembling part  21  to be described below in the car body fixing clip. 
     Next, describing the car body fixing clip  20 , the car body fixing clip is vertically provided with a hollow part in which the pillar fixing clip having the rectangular pillar shape may be accommodated. As shown in  FIG. 3 , the top surface of the car body fixing clip  20  is a surface closely attached to the bottom surface of the flange shape part of the pillar fixing clip  10  at the time of the pre-assembling. The top portion of the car body fixing clip is provided with the second pre-assembling part  21  having an upward cantilever shape due to slits  24  provided at the left and right thereof. 
     The second pre-assembling part  21  is pre-assembled with the first pre-assembling part  12 , wherein the end having the cantilever shape is provided with an inclined surface  211  inclined upwardly toward an inside to correspond to the inclined surface  121  of the separating preventing part. A protruded shape due to the inclined surface at the end of the cantilever corresponds to a shape in which the first pre-assembling part  12  is partially depressed. 
     Further, both sides of the second pre-assembling part  21  in the hollow part of the car body fixing clip are provided with the hook  25 , wherein the top portion of the hook  25  is stepped-up from the bottom portion thereof so as to interfere with the separating preventing part  13 . In addition, an outer surface of the car body fixing clip disposed at an opposite side to the second pre-assembling part  21  is provided with a protrusion  23 , which has a shape fitted in the fixing hole  31  of the metal clip to be described below. 
     Meanwhile, a middle portion of the car body fixing clip is provided with the flange shape part contacting the car body when the car body fixing clip is fixed to the car body by the car body fixing part  22  to be described below and the bottom portion of the flange shape part is provided with the car body fixing part  22 . 
     Next, describing with reference to  FIG. 4 , one side of the metal clip  30  has a “           ”-letter shape corresponding to the car body fixing clip, wherein one side thereof inwardly presses the second pre-assembling part  21  and the other side thereof is provided with a fixing hole  31  fitted in the protrusion  23 .
     An assembling shape of the tether clip configured as described above is shown in  FIGS. 5 to 7 . The pillar fixing clip is fitted in the car body fixing clip. In this state, the first pre-assembling part  12  is engaged with the second pre-assembling part  21 . The second pre-assembling part  21  is pressed inwardly in the state in which the metal clip  30  is fitted in a circumference of the second pre-assembling part  21 , such that the first pre-assembling part is firmly fixed to the second pre-assembling part. 
     The pillar fixing part  11  on the top portion of the pillar fixing clip  10  is fixed to the A pillar and the car body fixing part  22  on the bottom portion of the car body fixing clip  20  is fixed to the car body. 
     When the airbag is operated due to a collision of a vehicle, or the like, the operating force of the airbag pushes the A pillar so as to be far away from the car body. 
     In this case, the inclined surface  121  of the first pre-assembling part  12  of the pillar fixing clip fixed to the A pillar pushes up the inclined surface  211  of the second pre-assembling part  21  and the cantilever shape part of the second pre-assembling part  21  is spread outwardly from along the slope of the airbag and when the operating force of the airbag overwhelms the elastic force of the metal clip  30 , the first pre-assembling part is separated from the second pre-assembling part. 
     Further, when the separation preventing part  13  is hooked to the hook  25  while the pillar fixing clip  10  is drawn out from the car body fixing clip  20 , the pillar fixing clip  10  is no longer drawn out and then, stops. Therefore, the gap between the pillar fixing clip and the car body fixing clip is generated by the drawn-out length. 
     Here, the deploying force of the airbag can be controlled by a method for allowing the inclined surfaces  121  and  211  to control the inclined angle. For example, as the inclined surface is steep (as the inclined surface approximates to a vertical line in the drawing), the pre-assembling parts  12  and  21  are easily separated from each other even by a small deploying force. On the other hand, as the inclined surface is smooth (as the inclined surface approximates to a horizontal line in the drawing), the pre-assembling parts can be separated from each other only by a large deploying force. 
     Meanwhile, when A/S, or the like, is performed, the pre-assembling parts  12  and  21  can be easily separated from each other in the state in which the metal clip is spread. 
     As set forth above, according to the exemplary embodiment of the present invention, the pre-assembling strength is controlled by the metal clip and thus, the pre-assembling strength is not affected by the external environments unlike plastic, to thereby make it possible to manufacture products with high reliability. Further, the operating force of the tether clip can be controlled by controlling the inclined surface angle of the pre-assembling part, to thereby facilitate the design of the tether clip. 
     For convenience in explanation and accurate definition in the appended claims, the terms “upper”, “lower”, “inner” and “outer” are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. 
     The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.