Abstract:
A noise shut-off device is provided for doors of an automotive vehicle to effectively prevent driving noises from being introduced to the vehicle interior through draining holes formed at the bottom of the vehicle door, while allowing the draining out of water through the draining holes. The device has an external cylinder member with an open part having a vertical cylindrical opening and a plurality of main capillary ribs protruding outward from the open part, and an internal cylinder member with a shaft part being vertically accommodated in the open part cylindrical opening and having a plurality of auxiliary capillary ribs extending outward from the external circumference of the shaft part.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority of Korea patent Application No. 2000-41941, filed on Jul. 21, 2000 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a noise shut-off device for doors of an automotive vehicle and more particularly to a noise shut-off device for doors of an automotive vehicle for effectively shutting off a variety of noises in driving from being induced through draining holes formed at the bottom of internal panels to drain out water filled inside of doors in raining, thereby improving quietness at the internal room of the vehicle. 
     2. Description of the Prior Art 
     In general, a body of a vehicle is made of various metal plates through manufacturing steps like a press molding process, combining steps like welding and fastening processes for molded metal plates and other assembling steps required for complete production. Especially, doors  10  to be opened or closed at the body for passenger&#39;s getting on or off the vehicle are, as shown in FIG. 1, hinged at both sides of the body for rotation. 
     Furthermore, the door  10  is formed with internal and external panels  12 ,  14  (shown in FIG.  2 ). A plurality of draining through-holes  12   a  are pierced at the bottom of the internal panel  12  approximately in the vertical direction 
     At this time, the through-holes  12   a  are formed at the internal panel  12  of the door for draining out raindrops that form and roll along a glass  10   a  to be induced and filled at an internal space of the door. 
     However, the through-holes  12   a  formed at the internal panel  12  of the door  10  for the aforementioned function may also be played as a passage to induce various noises in driving as shown in FIG.  2 . The driving noises are largely classified into road noise conveying from surface of road and wind noise generating with induction of external air. The various noises as such get into the internal part of the door  10  in sequence through gaps between scuff panel  16  and door  10  and through through-holes  12   a . Since the road noise induces into the door  10  and then into the room of the vehicle through gaps between the door  10  and glass  10   a , it is disadvantageous in disrupting quietness at the internal room of the vehicle. 
     SUMMARY OF THE INVENTION 
     Therefore, the present invention is disclosed to solve the aforementioned problem and it is an object of the present invention to provide a noise shut-off device for doors of an automotive vehicle for effectively shutting off a variety of driving noises from inducing through draining holes formed at the bottom of the door, while the draining holes can also play their function of draining out water, thereby preventing the deterioration of quietness at the internal room of the vehicle caused by driving noises inducing via draining through-holes. 
     In order to accomplish the aforementioned object of the present invention, there is provided a noise shut-off device for doors of an automotive vehicle fastened with internal and external panels having draining through-holes at the bottom thereof, the device in the draining through-holes including: an external cylinder member with an open part being vertically pierced in the cylindrical shape and a plurality of main capillary ribs being deposited at the interval of multi-layers externally protruded all over the external circumference of the open part; and an internal cylinder member with a shaft part being vertically accommodated in the open part of the external cylinder member and a plurality of auxiliary capillary ribs being deposited at the interval of multi-layers externally protruded all over the external circumference of the shaft part. 
     Also, the interval of the auxiliary capillary ribs formed at the external circumference of the shaft of the internal cylinder member in the shape of multi-layers is smaller than that of the main capillary ribs formed at the external circumference of the external cylinder member. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     For fuller understanding of the nature and object of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings in which: 
     FIG. 1 is a perspective view for schematically illustrating an internal part of a door of a general automotive vehicle; 
     FIG. 2 is a cross-sectional view for schematically illustrating a section between through-holes and their corresponding scuff panel formed at the bottom of the internal panel of the general door; 
     FIG. 3 is a perspective view for illustrating a noise shut-off device for a door of an automotive vehicle in accordance with the present invention; 
     FIG. 4 is a vertical cross-sectional view of FIG. 3 for illustrating a state of a noise shut-off device installed at the internal panel of the door; and 
     FIG. 5 illustrates operational states of a noise shut-off device when water filled in the internal part of the door is drained out and when noise inducing from outside is shut off. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 
     FIG. 3 is a perspective view for illustrating a noise shut-off device for a door of an automotive vehicle in accordance with the present invention, and FIG. 4 is a vertical cross-sectional view of FIG. 3 for illustrating a state of a noise shut-off device installed at the internal panel of the door. Detailed description of the present invention will be described with reference to FIG. 1 illustrating a general door of a vehicle and FIG. 2 illustrating the gap between door and scuff panel. 
     As shown in FIG.  3  and FIG. 4, the noise shut-off device of the present invention is formed with a noise shut-off member installed at through holes  12   a  formed at the bottom of an internal panel  12  of a door  10 . 
     In other words, the noise shut-off member includes: an external cylinder member  20  with an open part  22  being vertically pierced lengthwise at the center thereof in the cylindrical shape and a plurality of main capillary ribs  24  being deposited at the interval of multi-layers externally protruded all over the external circumference of the open part; and an internal member  30  with a shaft part  32  being vertically accommodated in the open part formed at the center of the external cylinder member  20  and a plurality of auxiliary capillary ribs  34  being deposited at the interval of multi-layers externally protruded all over the external circumference of the shaft part  32 . 
     Also, the external cylinder member  20  includes: a fixing rib  26  formed at the lower portion thereof for being attached to the internal surface of the through-holes  12  to get inserted into the through hole  12   a  formed at the internal panel  12  of the door  10 ; and an integrated type of a hitching protruder  28  vertically protruded from the fixing rib  26  for being inserted through the internal surface of the through-holes  12   a  and hitched to the external surface of the through-holes  12   a , thereby preventing rattle noise that may generate at the noise shut-off device installed at the through-holes  12   a  of the internal panel  12  due to vibrations of a driving vehicle. 
     In addition, a plurality of pierced parts  20   a  are formed among the main capillary ribs  24  deposited all over the external circumference of the external cylinder member  20  in the shape of multi-layers to be correspondingly connected with the internal open part  22 , so that water can be induced from outside to the internal open part  22 . 
     On the other hand, an integral type of a covering part  36  is formed over the shaft part  32  of the internal cylinder member  30  with its center portion being convex and its edges being slightly lowered for being fit with the open part  22  of the external cylinder member  20 . As a result, if water forming at the auxiliary capillary ribs  34  of the internal cylinder member  30  vaporizes in the internal open part  22  of the external cylinder member  20 , the vaporizing moisture is induced by contacting the internal surface of the cover part  36  and flowing down into the open part  22 . 
     At this time, the interval of the main capillary ribs formed at the at the external circumference of the external cylinder member in the shape of multilayers is larger than that of the auxiliary capillary ribs formed at the external circumference of the shaft of the internal cylinder member in the shape of multilayers. 
     Furthermore, the main capillary ribs  24  of the external cylinder member  20  and the auxiliary ribs  34  of the internal cylinder member  30  are formed in thickness that gradually gets smaller from the center to the edge. 
     Accordingly, the external and internal cylinder members  20  and  30  can smoothly induce water from outside via the main and auxiliary capillary ribs  24  and  34  and continuously store the water at the space respectively formed between ribs. 
     Operations of the noise shut-off device for doors of an automotive vehicle will be described in detail in accordance with the present invention. 
     First of all, as shown in FIG. 5, raindrops inducing along the glass  10   a  to the internal part of the door  10  are collected at the bottom of a space formed between internal and external panels  12  and  14 , and the water W collected as such infiltrates among a plurality of main capillary ribs  24  formed at the external cylinder member  20  of the noise shut-off member and, further, into the open part  22  through the pierced part  20   a  formed between main capillary ribs  24 . 
     Secondly, the water W collected in the open part  22  of the external cylinder member  20  infiltrates among a plurality of auxiliary capillary ribs  34  formed around the external circumference of the shaft part  32  of the internal cylinder member  30 . 
     At this time, the water W collected at the internal part of the door  10  infiltrates and attracted among the main capillary ribs of the external cylinder member  20  and the auxiliary capillary ribs  34  of the internal cylinder member because of a capillary phenomenon in which liquid continuously rises along peripheral members in its surface tension. 
     Also, in the capillary phenomenon, the smaller the diameter of the capillary tube is formed, the higher the level of liquid surface gets with an increase of the surface tension. 
     In addition, if the quantity of water W to bringing about rise in the level of liquid surface increases at the external and internal cylinder members  20 ,  30 , the water W stored at the auxiliary capillary ribs  34  of the internal cylinder member  30  may drop down in a drop D by gravity and drain out through the through-holes  12   a  of the internal panel  12  and the scuff panel  16 . 
     On the other hand, if water flowing at the internal space of the door  10  is infiltrated and collected not only among main capillary ribs  24  of the external cylinder member  20 , but also among the internal open part  22  of the external cylinder member  20  and auxiliary capillary ribs  34  of the internal cylinder member  30 , a variety of driving noises N like road and wind noises, which may induce to the internal part of the door  10  through through-holes  12   a  formed at the bottom of the internal panel  12 , are completely blocked by the noise shut-off member to thereby make a contribution to keeping quietness at the internal room of the vehicle. 
     In other words, the noise shut-off member is constructed to continuously store water W of raindrops collected at the internal s pace of the door  10  at the main and auxiliary ribs  24  and  34 , so that various noises N inducing from outside are shut off by the water W stored at the ribs  24  and  34 . 
     Also, even if the water W stored among all the ribs  24 ,  34  is drained by any external factors like vibration of the body, the noise shut-off member can effectively block the inducing noises N with the shape of the auxiliary capillary ribs  34  of the internal cylinder member  30   
     As described above, there is an advantage in the noise shut-off device of the present invention in that a noise shut-off member is installed at the through-holes  12   a  formed at the bottom of the door  10  for smoothly draining out the rain water collected at the internal part of the door  10  and preventing various driving noises inducing through the through-holes  12   a  with water W collected by the noise shut-off member to thereby improve quietness at the internal room of the vehicle.