FI66955C - FOERBINDNING FOER ROERDELARNA I ETT AVLOPPSROERS VATTENLAOS - Google Patents

Description

1 66955

Connection of sewer pipe water trap pipe sections. - Förbindning för rördelarna i ett avloppsrörs vattenläs.

The invention relates to a joint of pipe sections of a water trap of a sewer pipe, consisting of interlocking pipe sections, the outer end of which is provided with an external thread and an internal bevel which receives a correspondingly beveled the outer surface of the inner tube.

When installing pipe sections with such joints, the problem is to determine the correct interlocking degree of the pipe sections. In this case, it may occur that the inner pipe is not pushed deep enough inside the outer pipe, so that the connection cannot withstand mechanical stress, and as a result the pipe parts may become detached from each other, which may cause water damage. There is also a risk of the joint coming loose if the tightened sleeve is not screwed tight enough, because the tightness of the joint depends solely on the friction between the outer surface of the outer tube and the inner surface of the seal.

In order to eliminate these drawbacks and to ensure that the joint does not open, the joint of the water trap pipe parts according to the invention is characterized in that a low annular recess is made in the outer surface of the inner pipe, which in the tightened state of the seal

In the following, an embodiment of the invention will be described with reference to the accompanying drawing, which shows a water trap of a sewer pipe, the connections between the pipe sections of which consist of connections according to the invention.

The water trap consists of a pipe curve 1 with an inlet pipe 3 and an outlet pipe 2. The inlet pipe 3 is connected to the furniture and the outlet pipe 2 to the sewer. The end of the tube 3 is inserted inside the end 4 2 66955 of the tube 1 and the other end of the tube 1 is inserted inside the end 4 of the tube 2. Reference numeral 4 thus denotes the outer end of the pipe sections of the joint. Both ends 4 are provided with an external thread 5 and an internal bevel 8, which receives a correspondingly beveled, i.e. conically tapered, outer seal 7. The threads 5 are gripped by an outer clamping sleeve 6, which can be pressed to compress the seal 7 along the bevel 8. and presses tightly against the outer surface of the inner tube 1 or 3.

In order to obtain a form-locked connection, a shallow annular recess 9 is made in the desired surface at the outer surface of the inner tube 1, 3. In this case, the seal 7 is pressed into the recess 9 even before the tightening sleeve 6 encounters substantial rotation resistance. Thus, the shape locking of the joint is ensured even if the clamping sleeve 6 is not very tight evenly. If the tightening is not sufficient, water dripping will occur, which of course can be corrected by performing an appropriate additional tightening. However, greater damage is avoided because the joint cannot be opened.

The existence of the ring grooves 9 also facilitates the work of the installer, as they guide the installer to find the correct degree of interlocking of the pipe sections. When the axial dimension of the annular recess 9 is slightly larger than the axial dimension of the seal 7, the pipe sections can move freely in the untensioned state by the difference between said axial dimensions, but instead the seal 7 adheres to the outer surface of the inner tube outside the annular groove 9. In this case, the installer clearly feels the change in the pushing tightness between the pipe parts when the seal 7 is in the ring groove 9.

Since the sealing takes place by radially shrinking the seal 7, the depth of the ring recess 9 must be as small as possible so that the desired shape-locking effect is still achieved. In this case, the seal 7 is obtained with a reasonable pushing tightness 3 66955 into the annular recess 9, after which the required rotation of the clamping sleeve 6 is not very much greater than with the previous joints without the annular recess 9.

Claims (2)

4 66955 A joint of pipe sections of a water trap of a sewer pipe, consisting of pipe sections (1, 2, 3), the outer end (4) of the pipe sections (1, 2) being provided with an external thread (5) and an internal bevel (8) receiving a chamfered, i.e. a conically tapered seal (7), in addition to which the threads (5) are gripped by an outer clamping sleeve (6), by turning which the seal (7) can be pressed tightly against the outer surface of the inner tube (1, 3), characterized in that the inner tube ( 1, 3) a shallow annular recess (9) is made in the outer surface, which in the tightened state of the seal (7) by form locking prevents the pipe parts (1, 2, 3) from being detached from each other. Pipe connection according to Claim 1, characterized in that the bottom of the annular recess (9) is cylindrical, the edges are steep and the depth is less than 0.5 mm. Joint according to Claim 1 or 2, characterized in that the axial dimension of the annular recess (9) is slightly larger than the axial dimension of the seal (7).