Pipe joints or couplings – Packed – Sleeve
Reexamination Certificate
2000-04-28
2001-11-06
Dayoan, B. (Department: 3627)
Pipe joints or couplings
Packed
Sleeve
C285S104000, C285S105000, C285S420000, C411S544000
Reexamination Certificate
active
06312025
ABSTRACT:
TECHNICAL FIELD
The invention relates to a pipe coupling as can be used for the tight connection of two pipe ends of an, in particular metallic, pipeline.
BACKGROUND OF THE INVENTION
German Patent DE 197 19 066 C1 discloses a pipe coupling which comprises a sealing sleeve which accommodates a seal and is arranged inside a supporting body, the supporting body, at least adjacent to one side of the sealing sleeve, supporting locking elements for one end of an inserted pipe, and these locking elements can dig into the inserted pipe while being raised in the radial direction when extension stress occurs. The locking elements are rectangular clamping plates, which are supported on the supporting body and are preloaded in the extension direction of the pipe via springs supported on the supporting body. Here, the clamping plates are accommodated by the supporting body in such a way that they can be pushed out, the supporting body being formed in its center part from axially extending lugs. This construction is relatively complicated with regard to the number of components and the preassembly as well as the final assembly when coupling pipes.
Furthermore, German Patent DE 44 28 570 C1 discloses a pipe coupling in which a relatively complicated connecting socket is provided, which is to be made as a cast part, has inner grooves, requiring internal machining, for accommodating sealing collars and is provided with through holes transversely to the longitudinal axis, the through holes serving to accommodate clamping units. The latter may consist of a clamping screw and two locking elements which can be adjusted with the clamping screw and are in the form of clamping wedges or sleeves which have cutting ribs and can be restrained against the pushed-in pipe via the clamping screw. However, the clamping units, if they were to be preassembled, would be displaceable in the through holes and could then hinder the insertion of the pipe. In this respect, this pipe coupling is also complicated and difficult to assemble.
SUMMARY OF THE INVENTION
An object of the invention is to provide a pipe coupling which can be produced in a preassembled state with little outlay. A further object of the invention is to provide a pipe coupling which is easy to assemble.
The subject matter of the invention is therefore a pipe coupling having a sleeve-shaped outer body for accommodating a sealing arrangement and at least one pair of clamping elements, which is arranged adjacent to one side of the sealing arrangement inside the sleeve-shaped outer body and serves to clamp the end of an inserted pipe in place, in which case the pair of clamping elements can be restrained against the end of an inserted pipe transversely to the axis of the pipe coupling via a clamping screw passed through the sleeve-shaped outer body and is pressed apart by means of a spring, and the clamping elements are guided in the restraining direction in the sleeve-shaped outer body.
Owing to the fact that a sealing sleeve containing a seal is accommodated in the preassembled state as an appropriate construction unit by a sleeve-shaped outer body, an independent, pressure-absorbing sealing unit facilitating the preassembly is formed. Owing to the fact that at least one pair of locking elements pressed apart by a spring and in the form of clamping elements is accommodated on the inside by the sleeve-shaped outer body, and this pair of locking elements can be restrained against the inserted pipe end transversely to the axis of the pressure coupling via a clamping screw passed through the outer body, the locking elements being guided in the restraining direction in the outer body, the entire pipe coupling can be preassembled from relatively few parts, in which case the locking elements also does not impair the actual assembly on account of the spring located in between, since the pipes to be connected can be pushed from here unhindered into the pipe coupling, since the pairs of locking elements are arranged so as to be self-centering by the spring relative to the pipe. In addition, during the coupling, the locking elements are pressed outward against the outer sleeve by the respective pipe end and are thereby additionally clamped, this action being intensified by internal pressurizing of the pipes.
Further objects, advantages and embodiments of the invention will become apparent from the following detailed description and accompanying drawings.
The invention will now be described by way of example with respect to preferred embodiments as shown in the drawings.
REFERENCES:
patent: 1143321 (1915-06-01), Robinson
patent: 2921801 (1960-01-01), Beyer
patent: 3877733 (1975-04-01), Straub
patent: 4616858 (1986-10-01), Sauer
patent: 4726611 (1988-02-01), Sauer
patent: 5248169 (1993-09-01), Barbe et al.
Dayoan B.
Lugo Carlos
Patterson, Thumate, Skaar & Christensen, P.A.
Sikla GmbH & Co. KG
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