DK149576B - CONNECTING FOR CONNECTION eg. OF EXHAUST PIPES - Google Patents

Description

1.

149576

The present invention relates to a pipe coupling for interconnecting, for example, an exhaust pipe from an internal combustion engine with a flex hose.

In visual and workshop halls, there is a need to connect 5 automobile exhaust pipes to a hose to drain the exhaust gases during work. A pipe coupling for this purpose must be so flexible that it can be used for the many different dimensions of exhaust pipes that occur, and furthermore it must be designed so that the coupling takes place without contact with heat and soiled exhaust pipes and also without use of auxiliary tools, eg screwdriver, wrench or strap. The pipe coupling is used where it is necessary to absorb exhaust gases, both for reasons of discharge and for the purpose of, for example, carbon dioxide testing. In addition, it is also desirable that the pipe coupling can be pulled off so that there is no damage to the exhaust pipe or breakage of the coupling if it is not removed when a car is driven out of a sight, for example. or workshop hall.

From German Patent Specification No. 912,645 and German Patent Specification No. 2,410,167, couplings are known for joining pipes which are formed at one end with an insertion end and at the other end are provided with an insertion sleeve having an annular recess for receiving a sealing ring.

In German Patent Specification No. 912,645, sealing is obtained by filling a hose with a pressurizing means, so that it clings to the socket of one tube and the sleeve of the other tube, and the same is obtained according to German publication specification no.

30 2.410.167 »where an evacuated tubing is placed between the tubes with subsequent abolition of the evacuation.

2nd

149576

These known couplings consist of several parts, and sealing is achieved either by means of a sealing ring, which only allows the coupling to be used for a few pipe dimensions, or by means of vacuum compressed hoses or pressure-filled hoses, which requires equipment which not usually present in workshops.

French Patent No. 1,572,520 discloses a connector or sleeve for joining pipe ends.

This sleeve is provided at each end with a recess or fold, in which is arranged an irreplaceable torus-shaped tube which, upon inflation, provides a close connection between a tube inserted into the sleeve and the sleeve. This coupling only works effectively if the tube inserted into the sleeve has a diameter that is only slightly smaller than that of the sleeve itself. If a tube of much smaller diameter were to be retained, the torus-shaped tube, in order to provide a tight connection, would have to have such a large diameter that it would no longer be trapped in the recess, causing a high risk of the coupling would be able to crawl along the tube.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe coupling of the above-mentioned type, which is far more flexible than the known pipe sleeves and can be used for pipes of different dimensions, both for pipes of much smaller diameter than the pipe coupling itself and for coupling of different diameter pipes.

This is achieved according to the invention by a pipe coupling, characterized in that the coupling consists of two coaxial rubber walls, of which the radially outer wall is substantially molded, and the entire radial inner wall can expose and thereby clamp around an exhaust pipe when the space between the walls is pressurized through a valve.

149576 3.

The pipe coupling according to the invention completely overcomes the risk of the coupling having to crawl, the radially inner movable wall providing a secure connection to the pipe ends which are inserted into the pipe coupling, 5 and in the very simple way the same pressure on the tubes is obtained, which is only difficult are obtained with the known sleeves if these are used together with pipes of different dimensions at the two ends.

Furthermore, a simpler structure is obtained than with the sleeve known from 10 French patent specification 1,572,520, in which must be inserted torus-shaped pipes, which must then be connected externally via valves, the pipe coupling being of very simple construction and can be made by vulcanizing materials of different flexibility and with 15 only one valve.

The preferred embodiment of claim 2 discloses a preferred embodiment of the pipe coupling constructed by vulcanizing rubber materials which can withstand the heat stresses to which they are subjected.

Thus, when the space between the walls is pressurized, the inner bellows will clamp onto the exhaust pipe and the removal is easily done by removing the air pressure through the valve. As a result, a very quick and easy attachment and removal of the clutch can be obtained, just as the same clutch can be used for different dimensions of exhaust pipes without any adjustment.

The pipe coupling according to the invention will be described in more detail below with reference to the drawing, of which 4.

149576 FIG. 1 is a sectional view of a pipe coupling according to the invention; FIG. 2 shows a pipe connection according to the invention used to connect two pipes with the same diameters and in inflated form; FIG. 3 shows a pipe coupling according to the invention fixedly mounted on a flex hose and coupled to an exhaust pipe; FIG. 4 shows a pipe coupling according to the invention used to connect two pipes of different diameters.

Referring to FIG. 1 of the drawing. The pipe coupling consists of two rubber walls, an outer wall 1 and an inner wall 2 formed as a sleeve with a through hole 3. The walls 1 and 2 are joined with the ends 4, 5, with the walls 1, 2 at one end. 4 is vulcanized together on the outermost part, and at this end a valve 6 is led to a cavity 7 between the walls.

In FIG. 2 shows the sleeve used for joining two pipes 8 20 of the same diameter substantially smaller than the inner diameter of the sleeve or coupling.

In FIG. 3, the sleeve is shown stationarily mounted on the end of a pipe or flex hose 11, which is held in place by a clamping band 9. At the "free" end is connected a pipe 8.

In FIG. 4 shows the coupling used to connect two pipes 8, 10 of different diameters.

The inner movable wall of the pipe coupling can e.g. be made up of a layer of card canvas, the threads of the canvas being longitudinally of the bellows, on which there is volcanic 149576 5.

serrated rubber. The outer wall 1 consists of two layers of short canvas, the yarns of the outermost layer being transverse to the yarns of the inner layer where the yarns are suitably longitudinally. This gives a 5 cross-dressing which, when co-vulcanized, gives a very stiff and stable wall so that it does not pose. The inner wall is suitably coated with an extra layer of rubber which is vulcanized to make it more durable.

10 When the pipe coupling is to be used in a fixed arrangement, the walls at one end of the outermost part can be vulcanized together to form a fixed sleeve which fits on a pipe for receiving exhaust gases, the coupling then only having to pass beyond the exhaust. -15 conduit to be mounted and pressurized.

The pipe coupling can be made in two sizes, one for passenger cars and one for trucks.