DE1299183B - Process for the assembly of elastic roll sealing rings for bell socket pipe connections and elastic sealing ring - Google Patents

Description

The invention relates to a method for assembling for bell socket pipe connections certain elastic roll sealing rings with a circular cross-section and a over this cross-section protruding undercut circumferential approach, which when pulling up the one lying with the undercut part in the lower ring quadrant Sealing ring rests on the surface of the spigot end of a pipe that goes into the bell socket a counter tube is inserted. The invention also relates to sealing rings for Perform this assembly procedure.

It is already known, a rolling sealing ring with a flat on the spigot end of a pipe to prevent it from jumping off the spigot end or to be secured against rolling back after rolling into the socket gap.

However, it is disadvantageous that the flattened bearing surface can be rolled up Opposes a great resistance in the socket gap, since the one facing away from the spigot end Edge of the flat acts like a lock. It is also disadvantageous for the sealing effect that there is no uniform compression over the entire circumference of the ring, since the sealing effect depends on the restoring force and this depends on the degree of compression is. Rings with a polygonal cross-section or with rings have similar disadvantages Circumferential ribs attached to the round base body, which are only slightly above the base body protrude.

It is also known to shape the rolling sealing ring so that it is relaxed State an essentially circular cross-section with a basic shape has a pointed pre-jump pointing to the center of the ring, its straight boundary lines tangentially emerge from the circular base body and make an angle of approximately Enclose 90 ° with each other, the rolling sealing ring with a flat side of the Projection is pulled onto the spigot end of a tube and the tip of the Has projection to the outer edge of the pipe spigot end. This version has the Advantage that the bell can easily set the sealing ring in rotary motion, since when the ring is correctly pulled onto the spigot end of the rotary motion as a result of the circular ring cross-section does not offer any substantial resistance, while rolling back the tube pushed into the bell is very difficult as soon as the ledge has passed the point of highest compression. However, it builds up in this embodiment, when the tubes are pushed into one another, a high pressure is applied against the inner wall of the bell and this creates an increased risk of the socket bursting, when the projection passes through the point of highest compression. This disadvantage attempts have been made to remedy this by arranging cavities in the area of the projection. However, this solution is also unsatisfactory and expensive to manufacture.

Another known rolling ring has a plurality of the circular ones Cross-section only slightly protruding rib-like projections and a sleeve-like Approach on. This sealing ring is not pulled onto the spigot end for rolling, but inserted into the bell socket, which generally has a special profile must have. Right at the beginning of the curling, the approach is made from the undercut Partly stretched out and the rolling ring experiences its highest compression at the same time when passing under a bead at the socket entrance, so that a great risk of There is damage to the sealing ring.

Another known sealing ring has two only slightly over the circular cross-section protruding rib-like projections and a longer one Cuff with its free end when pulling up the undercut Part of the sealing ring located in the lower ring quadrant onto the spigot end of the in a The bell socket of the pipe to be inserted rests on the pipe at a distance from its end, while the sealing ring itself lies on the outer end of the tube, the a rib-like projection lays against the face of the spigot end, during the other projection serves as a stop for the face of the bell socket. If this Ring is rolled up, the long sleeve forms part of the sealing surface, i. H. the seal takes place with strong compression of the sealing ring, so that a there is a strong tendency to roll back. In addition, the raising of one is such Sealing ring on the spigot end of a pipe difficult.

The object of the invention is to overcome the disadvantages outlined to avoid and the assembly of the sealing rings to be rolled up for bell tube socket connections and to improve these sealing rings themselves in such a way that the circumferential approach on the one hand a good fit of the ring pulled onto the spigot end of a pipe and a good one Provides protection against rolling back of the rolled ring, on the other hand, the rolling opposes the lowest possible resistance and the restoring force when driving through the point of highest compression is increased less than both known sealing rings.

To solve this problem, the method mentioned at the beginning is used in a method Art suggested that the sealing ring get close to the outer end of the neck the outer edge of the spigot on the pipe supporting it and the approach pushed completely through the point of highest compression during the rolling process will. The stop can have a relatively small cross section, however, it has sufficient stability to allow the ring to roll off the spigot end and to prevent the ring already rolled back from rolling back, while on the other hand it the curling is not significantly hindered and the forces of the highest compression keeps relatively low during the rolling process.

In a preferred embodiment of a sealing ring to lead through of the assembly method according to the invention runs the upper boundary surface of the Approach in a known manner tangential to the circular part of the ring, while the lower boundary surface lies at an acute angle to it. The cross section the approach increases continuously from its outer end, so that a total of seen gives a good support, on the other hand, however, the approach in his outermost area remains elastic enough to be largely on the when curling remaining part of the ring to be turned over.

For example, the preferred embodiment of the approach is thereby achieves that its lower boundary surface is radial to the circular part of the ring runs at an acute angle to the outer boundary surface of the approach. Through this the result is a triangular cross-section of the approach. The approach however, it can be made even more pointed, so that it looks like one over the circular Part of the ring that looks like a protruding lip. The lower boundary surface runs for this purpose the approach according to a line between the outer boundary surface and the through the ring axis and the tip of the neck connecting line is located.

In many cases the outer end of the attachment is sharp-edged or pointed. According to the invention, however, it is also possible to use the outer end of the approach to round off, so that the cross section of the approach in the area of the free End up not being weakened too much.

It has also been found that the dimensions of the ring are preferred are to be chosen so that the largest diameter of the provided with the approach Ring is related to the smallest diameter of the round ring as 1.4: 1 to 1.2: 1. With such dimensions, the proposed approach of the ring is only represents a stop, while the character of the circular rolling ring in cross-section remains essentially unchanged. Nevertheless, the attack is strong enough to to fulfill the tasks assigned to him in a satisfactory manner.

The ratio of the diameter to be selected is also dependent on the strength of the ring and the available roll-in path. The shorter the Roll-in travel and the larger the line thickness, the smaller the ratio must be be the diameter so that it is ensured in any case that the approach during the curling process hiked through the point of the highest compression and released from the compression will.

In the drawing are in F i g. 1 to 5 different embodiments of roll sealing rings for the method according to the invention in each case in a schematic cross-section shown.

In Fig. 1 shows an elastic rolling sealing ring 1 with an essentially circular cross-section, which has a circumferential extension 2 on one side. The outer boundary surface 3 of this projection 2 runs tangentially to the outer circumference of the circular ring 1, while the inner boundary surface 4 runs radially to the circular ring. The point angle α of the approach 2 is in the case of FIG. 1st embodiment shown about 30 °. The free end 2 a of the approach runs out in a point.

The ratio between the diameter c of the ring cross-section and the maximum diameter d of the ring with attachment is between 1: 1.2 to 1: 1.4.

The ring 11 according to FIG. 2 is provided with a weaker extension 12, the inner boundary surface 14 of which is undercut much more strongly. The apex angle between the outer boundary surface 13 and the inner boundary surface 14 is approximately half as large as in the exemplary embodiment according to FIG. 1 and is therefore about 15 °.

According to FIG. 3, the ring 1 is drawn onto the spigot end of a concrete pipe 5, which is only partially shown. The free end 2 a of the projection 2 is supported on the spigot at its forward edge, while the inner limiting surface 4 extends undercut so that under the approach 2 a limited by the limiting surface 4 and the shell of the circular ring cavity 6 remains free. This cavity allows the extension 2 to be largely placed on the outer surface of the ring 1 when it is rolled up, while tipping over in the opposite direction is prevented by the obliquely outwardly extending outer boundary surface 3 and thus by the increasing increase in the cross-section of the extension 2 .

The sealing ring 21 according to FIG. 4 has a thicker cross-section approach 22, the free end 22 a is rounded. When ring 31 according to FIG. 5, the approach 32 is longer than the approach 22 according to FIG. 4, but also the free end 32 a is rounded.

Claims (6)

Claims: 1. A method for the assembly of elastic rolling sealing rings intended for bell socket pipe connections with a circular cross-section and an undercut, circumferential approach protruding beyond this cross-section, which is located on the surface of the spigot end of the one when the sealing ring lying with the undercut part in the lower ring quadrant is pulled up Supports pipe which is inserted into the bell socket of a mating pipe, characterized in that the sealing ring (1, 11, 22, 31) with the outer end (2 a, 22 a, 32 a) of the extension (2, 12 , 22, 32) near the outer edge of the spigot end in a supporting manner on the tube (5) and the attachment is pushed completely through the point of maximum compression during the rolling process. 2. Roll sealing ring for performing the method according to claim 1, characterized in that the upper boundary surface (3, 13) of the undercut projection (2, 12, 22, 32) in a known manner tangential to the circular part of the ring (1 , 11, 21, 31) and the lower boundary surface (4, 14) is at an acute angle (a) to it. 3. Roll sealing ring according to claim 2, characterized in that the lower boundary surface (4) of the extension (2, 22, 32 ) extends radially to the circular part of the ring (1, 21, 31). 4. Roll sealing ring according to claim 2, characterized in that the lower boundary surface (14) of the undercut Approach (12) runs along a line between the outer boundary surface (13) and through the ring axis and the free end (2a) or the tip of the approach (12) leading connecting line. 5. Roll sealing ring after one or more of claims 2 to 4, characterized in that the outer end (22a, 32a) of the undercut approach (22, 32) is rounded. 6. Roll-sealing ring according to one or more of claims 2 to 5, characterized in that the largest diameter (d) of the ring (1, 11, 21, 31 ) provided with the undercut extension (2, 12, 22, 32) ) is related to the smallest diameter (c) of the round ring as 1.4: 1 to 1.2: 1.