DEVICE AND METHOD FOR MOUNTING OF A LEAD-THROUGH MEANS

Abstract: The present invention relates to an arrangement in a duct through an opening in a wall (3), preferably in a vehicle, comprising an elongated ducting element (2). The arrangement is characterised in that the ducting element (2) has a component (9) projecting therefrom on all sides, which is designed to bear against the edges of the opening so that sealing is produced between the two sides of the wall, defining an installed position. Behind the component (9), viewed in the direction of ducting, there is a flexible section (5), which under loading of a part in front of the said section (5), permits displacement of the said part in relation to its unloaded longitudinal extent. The wall (3), viewed from its front face in the direction of ducting has a depression (6) formed all around the opening, so that the opening essentially forms the lowest point of the depression (6), which is designed to guide the tip of the ducting element (2) towards the opening and through the latter to the installed position. The invention also relates to a method of installing the above-mentioned ducting element (2).

Description: Device and method for mounting of a lead-through means The present invention relates to an arrangement in a duct through an opening in a wall, preferably in a vehicle, comprising an elongated ducting element. The present invention also relates to a method of placing an elongated ducting element in an installed position in an opening in a wall, preferably in a vehicle. It is sometimes necessary when manufacturing vehicles to lead lines of different types, for example pipes for liquids or gases or electrical cables through sheet metal walls in the vehicle. For this purpose holes are drilled in the sheet metal plates, following which the lines can be drawn through the sheet metal plates. In many applications, however, it is required that the ducting through the said sheet metal walls be designed in such a way that it is impossible for water, moisture and in certain situations even sound to penetrate through the hole in the sheet metal wall. A common method nowadays of sealing off such a hole in the sheet metal wall is to install a rubber ring in the hole with an opening at the very centre, the outside radius of which ring coincides with the radius of the hole, and then to lead a drainage hose or any of the above-mentioned lines through the opening in the rubber ring. An object of the present invention is to produce a duct through a wall, which can be installed by means of a robot. A further object is to produce a duct installable by a robot that is liquid and moisture- tight and soundproof. This has been achieved in one design by means of an arrangement of the said type, which is characterised in that the ducting element has a component projecting therefrom on all sides, which is designed to bear against the edges of the opening so that sealing is produced between the two sides of the wall, defining an installed position; that behind the element, viewed in the direction of ducting, there is a flexible section, which under the effect of a slight force applied anywhere along the longitudinal extent of one part in front of the said section permits displacement of the part in relation to the unloaded longitudinal extent of the part; that the wall, viewed from its front face in the ducting direction, has a depression formed all around the opening so that the opening essentially forms the lowest point of the depression, the said depression being designed to direct the tip of the ducting element towards the opening and through the latter to the installed position. Preferred embodiments have any or some of the characteristics specified in the subordinate claims 2 to 5. The invention also comprises a method of the said type, which is characterised in that the ducting element is provided with a component projecting on all sides which, when the ducting element is placed in the installed position, bears against the edges of the opening, so that sealing is produced between the two sides of the wall; that behind the element, viewed in the direction of ducting, the ducting element is provided with a flexible section such that, under the effect of a slight force applied anywhere along the longitudinal extent of one part in front of the said section, the part is displaced in relation to its unloaded longitudinal extent; that the wall, viewed from its front face in the ducting direction, is provided with a depression all around the opening, so that the opening essentially forms the lowest point of the depression and that the tip of the ducting element is inserted towards the depression, which directs the tip so that it is guided towards the opening and through the latter to the installed position. Preferred embodiments have any or some of the characteristics specified in the subordinate claims 7 to 10. The arrangement and the method according to the invention have a number of advantages compared to the prior art. The depression formed in the wall, together with the fact that the part in front of the flexible section can form angles with its direction of movement allows the tip of the ducting element to be directed towards the opening and through the latter during installation, even if the movement is not aimed precisely towards the opening. These error tolerances facilitate robot installation of the ducting element. The diameter of the depression can be selected according to prevailing circumstances, such as the performance of the robot, for example, so that when installing the ducting element it always strikes the wall somewhere in the depression. In addition, the ducting element according to the invention has a simple construction formed in a single piece, which can be manufactured at low cost. The arrangement according to the invention may be used for ducting various types of media, such as liquids and gases, for example. Furthermore one or more electrical cables may be drawn through the ducting element. The invention will be explained below with the aid of examples of embodiments of the arrangement and the method according to the present invention. Figure 1 shows and example of an installed ducting arrangement Figure 2 shows the ducting element in figure 1 uninstalled. In figure 1 , the reference number 1 denotes an arrangement in a duct through an opening in a wall 3, comprising a ducting element 2. The wall in one embodiment is a sheet metal plate in a vehicle. Naturally walls of other rigid material are also conceivable. The ducting element 2 is elongated with a through-duct 4 running in the longitudinal direction. The duct 4 is designed to convey liquids or gases, for example, between the two ends of the ducting element and an electrical cable may also be carried. The ducting element may be manufactured from any rubber material, such as EDPM (ethylene-propylene-diene-methylene). In order to simplify the explanation we shall divide the ducting element into two parts, the first of which is that part which, with the ducting element in the installed position, is inserted through the opening, whilst the second part is not inserted through the opening. Figure 1 shows the installed position. The diameter along the length of the first part is somewhat less than the diameter of the opening. The second part, in an area close to the boundary with the first part, has a flexible section 5, designed so that under the effect of a force applied anywhere along the longitudinal extent of the first part, the said first part is displaced in relation to its longitudinal extent not subjected to loading. In the example in the figure, the flexible section is formed by some radial corrugations preferably running all round. The plate 3 has a depression 6 that, viewed from its front face, is formed around the opening, so that the opening essentially forms the lowest point of the depression 6. In one example the depression is essentially funnel-shaped. If the ducting element 2 is held at its end by the second part and is directed towards the depression 6 in the plate 3, the flexible section 5 of the ducting element 2 together with the depression 6 will make it possible to guide the first part towards the opening and through the latter to the installed position. When the first part encounters the depression 6, at the same time that a force is pressing the ducting element forwards, the direction of movement of the funnel-shaped ducting element will be altered due to the depression 6, so that the first part passes through the opening. Since robot installation requires that a certain degree of misalignment be tolerated, it is necessary to be able to adjust the direction of movement of the ducting element 2 in this way. Consequently the diameter of the depression is selected according to the performance of the robot, so as to maximise the probability of the ducting element encountering the plate somewhere in the depression. The ducting element 2 has a guide fitted to the end of the first part. The guide 7 is that part of the ducting element which during installation encounters the plate 3. The guide 7 is made of a material such that the friction forces between the plate and the guide 7 remain low, as a result of which the ducting element slides easily into the opening. In one example the guide 7 is a plastic ring fitting in one end, which is detached when the arrangement 1 is installed. In one example the ducting element, at its end on the first part, is designed so that after the plastic ring has been detached the ducting element can be fitted to any pipe (not shown) for conveying liquid or gas, for example. The second part, in the area around the end of the ducting element, has a connecting part 11 for connection to a pipe 8 for conveying liquid or gas, for example, the pipe 8 in turn being connected to some system (not shown), for example an air conditioning system, in the vehicle. It is immaterial for the invention whether the pipe 8 and any associated system are fitted to the ducting element before or after installation of the arrangement 1. In the example in figure 1 the second part of the ducting element is bent. This bend may be selected so that the ducting element 2 can be very easily connected to the pipe 8 and the associated system. The ducting element 2 has a flexible flange 9, which defines the boundary between the first and the second part and which in the installed position in figure 1 is deformed towards the edges of the opening, so that the ducting element 2 forms a seal between the two sides of the wall. Figure 2 shows the ducting element 2 uninstalled. In this figure the flange 9 is not deformed, but is directed radially outwards from the ducting element 2. As will be seen from the two figures, there are fitted or integral snap elements 10 on the first part, which are designed to prevent the ducting element, once installed, from being displaced back out of the installed position. This is particularly important where the material of the ducting element ages, that is dries and shrinks somewhat.

Claims: CLAIMS 1. Arrangement in a duct through an opening in a wall (3), preferably in a vehicle, comprising an elongated ducting element (2), characterised in that the ducting element (2) has an component (9) projecting therefrom on all sides, which is designed to bear against the edges of the opening so that sealing is produced between the two sides of the wall, defining an installed position, behind the component (9), viewed in the direction of ducting, there is a flexible section (5), which under the effect of a small force applied anywhere along the longitudinal extent of one part in front of the said section (5), permits displacement of the said part in relation to its unloaded longitudinal extent, the wall (3), viewed from its front face in the direction of ducting has a depression (6) formed all around the opening, so that the opening essentially forms the lowest point of the depression (6), which is designed to guide the tip of the ducting element (2) towards the opening and through the latter to the installed position. 2. Arrangement according to claim 1 , characterised in that the component (9) is a flexible flange, which in the installed position is deformed towards the edges of the opening, thereby achieving the seal. 3. Arrangement according to claim 1 or 2, characterised in that the flexible section (5) comprises at least one radial corrugation. 4. Arrangement according to any of the preceding claims, characterised in that it has means (10) designed to prevent the ducting element (2), once it has been installed, being displaced out of the installed position, the said means (10) preferably being at least one snap element arranged in front of the component (9). 5. Arrangement according to any of the preceding claims, characterised in that the ducting element (2), in one area around its ends, has a connecting part for connection to a pipe (8) for conveying liquid or gas, for example. 6. Method of placing an elongated ducting element (2) in an installed position in an opening in a wall (3), preferably in a vehicle, characterised by the following steps, not necessarily performed in the order stated: the ducting element (2) is provided with a component (9) projecting on all sides which, when the ducting element is placed in the installed position, bears against the edges of the opening so that sealing is produced between the two sides of the wall. behind the element, viewed in the direction of ducting, the ducting element (2) is provided with a flexible section (5) such that, under the effect of a slight force applied anywhere along the longitudinal extent of one part in front of the said section (5), the part is displaced in relation to its unloaded longitudinal extent; the wall (3), viewed from its front face in the direction of ducting, is provided with a depression (6) all around the opening, so that the opening essentially forms the lowest point of the depression, the tip of the ducting element (2) is inserted towards the depression (6), which directs the tip so that it is guided towards the opening and through the latter to the installed position. 7. Method according to claim 6. characterised in that the flexible section (5) is formed by at least one corrugation running all round. 8. Method according to claim 6 or 7, characterised in that the component (9) is a flexible flange which, when introduced into the opening, is deformed towards the edges of the opening, thereby producing the seal. 9. Method according to any of claims 6 to 8, characterised in that a robot is made to perform the step in which the ducting element (2) is guided towards the depression (6). 10. Method according to any of claims 6 to 9, characterised in that the ducting element (2), after installation, is prevented from leaving the installed position.

Inventors: JOHANSSON GOERAN, PETTERSSON MAANS, JOHANSSON, GOERAN, PETTERSSON, MAANS
Applicants: JOHANSSON GOERAN, PETTERSSON MAANS, VOLVO AB, AB VOLVO, JOHANSSON, GOERAN, PETTERSSON, MAANS
Application year: 1999
Main classification: B60R13
IPC codes: B60R16, B62D25, F16L41, H02G3