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Pipe coupling with deformable outer sleeve

  • US 3,905,623 A
  • Filed: 04/05/1974
  • Issued: 09/16/1975
  • Est. Priority Date: 04/05/1974
  • Status: Expired due to Term
First Claim
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1. In a pipe coupling of the type comprising an outer pipe and an inner pipe extending into one end portion of the outer pipe, an end portion of the inner pipe having a peripheral length on the outer surface which is greater than the peripheral length of the opposed inner surface on the end portion of the outer pipe, force applying means adapted to act between the pipe ends for deforming the outer pipe end to change the cross-sectional dimensions thereof and produce a close fitting engagement with the inner pipe end wherein the inner pipe end is in compressive stress and the outer pipe end is in tensile stress, the improvement wherein the wall of said outer pipe end is of roundish cross-section except for at least one sector of increased radius defining an inwardly opening, axially extending channel, the wall of said inner pipe end is of roundish crosssection except for at least one wall-extension sector of increased radius defining a spline portion, said inner pipe end extending into said outer pipe end with said spline portion in said channel in loose fitting engagement with the pipe ends in an unstressed condition, the peripheral length on the inner surface of a cross-section of said channel being less than the peripheral length on the outer surface of a cross-section of said spline portion, said force applying means comprising fastener means having a shank extending through said channel with a movable element on at least one end reacting on said channel whereby tightening of the fastener means draws the wall of the channel toward the spline portion and the outer pipe end is stretched over the inner pipe end.

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