Abstract:
Plug means for closing holes in the body of vehicles, whereby it comprises valve means having a valve member which normally is biased towards a sealing edge and which opens if a predetermined pressure drop between the interior of the body and the exterior thereof occurs.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a plug for closing holes in a vehicles body. 
     It is known to close so-called paint run-off holes in body parts, such as in the door region or likewise with hole plugs of plastic. In this manner, corrosion from contaminants or moisture penetrating into the inside of the body is prevented. On the other hand, it is disadvantageous that penetrated contaminants such as dust granules, loose particles and also moisture may no longer escape after the sealing of the cavity. 
     BRIEF SUMMARY OF THE INVENTION 
     It is therefore an object of the invention to provide a plug to prevent the penetration of dust and moisture from outside into the body parts of automobiles, but permit the escape of contaminants and collected water. The holes to be closed may have a circular, square or rectangular contour. 
     The plug according to the invention contains a valve having a valve member that bears under normal against a sealing edge. With a drop in pressure from the body inside to the outside by a predetermined amount, the valve opens so that water may flow out from the inside of the body part. If this has been effected, the valve returns to its closed position and prevents the penetration of dust and moisture. 
     The valve is located in a plug which is fastened in a hole in a suitable manner. Such plugs are known in a multitude of embodiments. They are normally plastic and are clipped into a hole. With this it is important that accommodation of the plug in the hole is such that an adequate sealing is ensured. 
     According to one formation of the invention the valve member is formed by a flexible diaphragm. Various possibilities are conceivable for forming the diaphragm or positioning in the plug such that the desired function is guaranteed. One formation of the invention for this envisages the membrane to be biased against a sealing edge of the plug by way of an inherent spring effect. 
     The diaphragm may be provided as a separate part in the plug arrangement whereupon this will be gone into in more detail further below, or be integrally formed with the valve body which is formed as a hole plug. The valve body is preferably of a relatively hard material and the diaphragm of a relatively soft material. Plastic could methods—two-component manufacture in one tool—are known for the manufacture of integral parts of different materials. Another method permits the molding of the hole plug on the one side and the injection of the diaphragm part to or around the hole plug in a second could on the other side. 
     According to a further formation of the invention the diaphragm, as already mentioned, is formed separately from the valve body formed as a hole plug. The diaphragm is connected to a shank which may be clipped into a receiving opening of the valve body. The valve body comprises a circumferential sealing edge against which the diaphragm normally bears. If however there occurs a pressure difference at the diaphragm on account of a water column within the body part or also on account of the fact that temporarily with respect to the surroundings, within the automobile an excess pressure is produced, the diaphragm is lifted from the sealing seat to a greater or lesser degree, by which means fluid may be drained and air may escape. Normally however the hole would be closed so that dust or other contaminants may not penetrate into the inside of the body part. The diaphragm is designed such that only slight forces are adequate in order to let it be lifted partly from the sealing seat, and on the other hand it must constantly maintain the sealing. In this context one formation of the invention envisages the diaphragm to be circular and the shank to be mounted eccentrically on the diaphragm, and the receiver opening in the valve body to be arranged correspondingly eccentrically to the annular sealing edge. By way of this the diaphragm towards one side has a relatively large “lever arm” so that already a relatively small weight of the water column or a slight air pressure difference is sufficient in order to slightly deform the diaphragm and to permit the fluid to flow out. 
     The receiver opening in the valve body is preferably formed in a bottom portion which is located within the hollow valve body and extends radially inwards from the inner side of the valve body. A large part of the “bottom” thus remains free. A large part of the diaphragm lies free and is exposed to the described pressures or pressure differences for the purpose of deformation of the diaphragm and lifting from the sealing edge. A circular arc shaped outer contour of the bottom portion permits a deformation of the diaphragm against a resistance which is not so large. 
     The shank on the diaphragm is preferably a resilient prong which cooperates with a radial relief of the receiver opening in order to create an orientation of the diaphragm relative to the valve body. The prong is furthermore designed such that it latchingly grips behind the edge of the relief when the shank is completely introduced into the receiver opening. 
     The shank furthermore comprises a shoulder which grips behind the hole edge when the shank is introduced. Since the outer diameter of the shoulder is larger than the diameter of the receiver opening, the shank on introduction into the receiver opening must be temporarily deformed radially inwards. The shank must therefore according to a further embodiment of the invention be formed hollow but closed towards the free end so that no passage is created between the inside of the body and the outside. 
     The valve body or the plug comprises, according to another formation of the invention, a sleeve-like portion which on the outside is conical and converges towards the free end. By way of this with a radial deformation of the sleeve-like portion it may be inserted into the hole, wherein then a shoulder grips behind a hole edge. Furthermore there is provided a radial flange which bears sealingly against the outer side of the body when the plug has been completely inserted into the hole. By way of this a sealing arrangement of the plug in the hole is given and a passage of fluid is only possible from the inside to the outside. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention is hereinafter described in more detail by way of the drawings. 
     FIG. 1 shows perspectively a valve body obliquely from above, of a plug according to the invention. 
     FIG. 2 shows a plan view of the valve body according to FIG.  1 . 
     FIG. 3 shows a section through the valve body according to FIG. 2 along the line  3 — 3 . 
     FIG. 4 shows a section through the valve body according to FIG. 2 along the line  4 — 4 . 
     FIG. 5 shows a section through a valve plug according to FIG. 6 along the line  5 — 5 . 
     FIG. 6 shows a plan view of the valve plug according to FIG. 5 in the direction of arrow  6 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     As can be deduced from the FIGS. 1 to  4 , a valve body  10  comprises a sleeve-shaped portion  12  with an approximately cylindrical bore  14  and a conical outer contour  16  which converges towards the free end, i.e. in the FIGS. 1,  3  and  4  upwards. At a distance to the free end the sleeve-shaped portion  12  is provided with a circumferential or annular shoulder  18  which runs somewhat obliquely to the axis of the sleeve-shaped portion  12 . At a distance to the shoulder  18  there is formed a flange  20  which faces radially outwards. It has a circular arc shaped cross sectional contour and extends axially tip to the height of the shoulder  18 . The sleeve-shaped portion  12  comprises several radial openings just above the shoulder  18  (FIG. 3) for leading away water, dust or likewise into the inside of the valve body  10 . The valve body  10  is applied into a hole of a body part, which is not shown, for example in the boot space, in the door region, in the underfloor or in the front vehicle part, and specifically with the free end introduced from below, wherein on account of the conical outer contour  16  the sleeve portion  12  is temporarily deformed inwards until the shoulder snaps behind the hole edge. At the same time the free edge of the sealing flange  20  bears against the outer surface of the body part. 
     In the inside of the valve body  10  below the sleeve-shaped portion  12  roughly at the height of the flange  20  there is formed a bottom portion  22 . It is formed as a semicircular projection or web and extends on the inner side of the valve body  10  radially inwards. The bottom portion has, as a result, a circular contour  24 . It extends somewhat beyond the middle of the body  10 , but still leaves an adequately large space  26  for the purpose yet to be described. As can be recognized in FIG.  2  and also in FIG. 1 the circular contour  24  roundly blends into the valve body as is indicated at  26 . 
     In the bottom portion  22  there is formed a circular receiver opening  28  which comprises a radial rectangular enlargement  30  pointing in the direction of the free space  26 . 
     As is deduced from the FIGS. 3 and 4 the bottom portion  22  in the region of the hole edge is beveled, wherein the beveling converges upwards. 
     In the FIGS. 5 and 6 there is shown a valve plug  34  which consists of a spherical segment shaped diaphragm  36  and a shank  38 . Towards the free end the shank is formed spherically as is to be recognized at  40 , wherein the shank  38  tapers towards the free end. Below the spherical portion  40  there is formed an oblique annular shoulder  42 . The shank  38  is provided with a pocket hole  44  which is formed in from the diaphragm side. The pocket hole serves for the automatic assembly with the help of a robot which is not shown. 
     As is deduced from FIG. 6 the shank  38  at one location is formed with a spring prong  46  which can be bent radially inwards. It protrudes somewhat beyond the outer contour of the shank  38  in the spherical region and serves as a rotational securement for the valve plug  34 . 
     The valve plug  34  with its shank  38  is introduced into the receiver opening  28 . wherein the prong  46  cooperates with the enlargement  30 , by which means a suitable orientation of the rotational position of the diaphragm plug with respect to the valve body  10  is obtained. If the shank  38  is completely inserted the prong snaps behind the edge of the enlargement  30 . On introducing the shank  38  this is deformed radially inwards until the shoulder  42  snaps behind the edge of the receiver opening  28 . With this the diaphragm  36  bears against a scaling edge  48  of the valve body  10 , which is arranged below the receiving body in an annular maimer. In this manner the hole into which the valve body  10  is clipped is protected against the penetration of dust, moisture or likewise. If however on the inner side of the body part there is formed a greater or lesser column of water, by way of this the diaphragm  36 , on account of the force of the weight, is deformed downwards to a greater or lesser degree and lifts from the sealing edge  48  so that water may run out. After this has been effected the diaphragm  36  again bears against the sealing edge  48  and closes the hole again. 
     The outer-middle arrangement of the shank  38  permits a relatively long, moment arm for deforming the diaphragm  36 . This may therefore be equipped with an adequate spring force in order to ensure a secure closing in the normal case. On the other hand already a relatively small column of water is sufficient to lift the edge of the diaphragm from the sealing edge  48 . 
     The material for the valve body  10  and the valve plug  34  is preferably of plastic. With this the material for the valve plug  34  may be somewhat softer than that for the valve body  10  which may be formed of relatively hard material.