PIPE COUPLINGS

• US 3,592,491 A
• Filed: 04/10/1968
• Issued: 07/13/1971
• Est. Priority Date: 04/10/1968
• Status: Expired due to Term

• Current Assignee: Glover John Benjamin
• Original Assignee: Glover John Benjamin
• Inventors: GLOVER JOHN BENJAMIN
• Application Number:
  US04/720,083
• Time in Patent Office: 1,189 Days
• US Class Current: 285/230
• CPC Class Codes: F16L 21/022 used with sleeves or nipples for pipes of the same diameter, or with reduction pieces F16L21/025 takes precedence
• CPC Class Codes: F16L 47/08 with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket

Abstract

A synthetic plastic coupling sleeve for clayware, pitch-fibre or asbestos-cement plain-end pipes has a corrugation at each end forming inwardly facing recesses for sealing rings, each recess having a rectangular cross section, and each sealing ring comprising a body portion filling its recess except for a portion corresponding to an annular groove of semicircular cross section in the sealing ring midway between the ends of the recess and adjacent the wall of the recess, and an annular sealing head having at least the side facing the outer end of the recess-but preferably both sides of the head-bevelled and spaced from the outer side of the body portion, the volume of the sealing head being appreciably greater than the volume of the groove.

Claims

1. A pipe coupling comprising a sleeve of resilient synthetic plastic material having a wall corrugated at each end of a cylindrical portion to define inwardly facing annular recesses for resilient sealing rings of radial thickness exceeding the depth of the recesses, characterized in that the recess at each end of said sleeve has a rectangular cross section, and in that each sealing ring comprises a body portion formed initially to fill its recess so as to afford a close fit of said body portion in the recess except for a portion corresponding to an annular groove of semicircular cross section in the sealing ring midway between the ends of the recess and adjacent the bottom wall of the recess, and an annular sealing head having at least the side facing the outer end of the recess bevelled and spaced from the outer side of the body portion, the volume of the sealing head being appreciably greater than the volume of the groove whereby, upon insertion of a pipe-end into one end of said sleeve, the sides of said body portion are further pressed against the ends of one of the recesses to resist any tendency for the sealing ring to be dislodged, and said sealing head being distorted inwardly of the sleeve for insuring good sealing contact with the pipe-end.

2. A pipe coupling as in claim 1, wherein the inner side of each sealing head is similarly bevelled and spaced from the inner side of the body portion, and wherein the oppositely bevelled sides are blended into each other by a rounded inner periphery.

3. A pipe coupling as in claim 1, wherein each end of each recess blends by a radius into the wall of the recess, the bodies of the sealing rings being bevelled or rounded to correspond when fitted.

4. A pipe coupling as in claim 1, wherein the sealing rings are formed initially with a slightly greater overall axial width than the recesses.