JOINTS BETWEEN PIPES OF DIFFERENT DIAMETERS AND COUPLINGS AND GASKETS FOR THE SAME

• US 3,680,894 A
• Filed: 10/30/1970
• Issued: 08/01/1972
• Est. Priority Date: 10/30/1970
• Status: Expired due to Term

• Current Assignee: John S. Young
• Original Assignee: John S. Young
• Inventors: Young, John S.
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US05/085,616
• Time in Patent Office: 641 Days
• Field of Search: 28/111,367,112,177,233 277/206
• US Class Current: 285/112
• CPC Class Codes: F16L 17/04 with longitudinally split or divided sleeve
• CPC Class Codes: F16L 25/14 Joints for pipes of different diameters or cross-section

Abstract

A joint between the ends of two pipes of different diameter formed by clamp-type segmental coupling elements having legs ending in key sections engaging grooves in the surfaces of the pipes. The leg for engagement with the pipe of smaller diameter is longer than the other leg. A pressure responsive gasket seated within the housing has lips engaging the pipe surfaces and has members for preventing the longer of the gasket legs from unseating its lip in response to pressure differential between the interior and exterior of the pipe. An additional rib may be provided for closing the space between the pipe ends.

Claims

1. A gasket for sealing the joint between aligned sections of pipe of different diameters, said gasket comprising a short cylinder C-shaped in cross section having a base portion and having side portions extending radially inwardly from said base portion at the longitudinal ends thereof forming a hollow within said gasket, one of said side portions having a greater radial extent than the other thereof, said sides terminating in oppositely inwardly extending lips and a plurality of thin transversely extending uniformly spaced webs within the hollow of said gasket, said webs extending integrally from the inner surface of the longer of said sides and the inner face of said base, all said webs being free from engagement with the shorter of said sides.

2. A gasket as in claim 1, said webs commencing at a position closely adjacent to but above the juncture of said longer side and the lip carried thereby and terminating at a position closely adjacent to but spaced inwardly from the position where said shorter side joins said base.

3. A gasket as in claim 1, said webs being of rectangular shape.

4. A gasket as in claim 3, said webs extending radially inwardly beyond the lip carried by the shorter of said sides.

5. A gasket as in claim 2, the outer edge of said gasket being on a diagonal line extending from said commencing position to said terminating position.

6. A gasket as in claim 1 and including a radially inwardly extending leg extending from the base of said gasket intermediate said sides, said webs terminating at the side of said leg opposite said longer side.

7. A gasket as in claim 6, said leg terminating in a convexly rounded face on the side thereof opposite said shorter side.

8. In clamp type couplings for forming a joint between pipes of different diameters, segmental coupling housings formed to make a complete cylinder when applied to pipes to be joined, each of said housing segments Having a base portion and having radially inwardly extending rims at each side of said base portion, said rims forming with the interior of said base portion a gasket receiving channel, one of said rims having a greater radial extent than the other, the radial end faces of said rims being formed with key sections for engagement with grooves formed in the pipes to be joined, and a pressure responsive gasket formed for mated reception in said receiving channel, said gasket having a circumferential base portion and radially extending side portions extending therefrom forming a hollow therewithin, said side portions terminating in inwardly extending opposed lips for engagement with the surfaces of pipes to be joined, one of said side portions having a greater radial dimension than the other thereof in correspondence with the rim of greater radial extent, and transversely extending thin webs at spaced positions within the hollow of said gasket, said webs extending integrally from and connecting the inner surface of the longer of said sides with the inner surface of the base of said gasket, all said webs being free from engagement with the shorter of said side portions.

9. In couplings as in claim 8, said gasket webs extending from the longer of said sides at a position spaced above the lip carried by the same and continuing in spaced relationship with respect to said side portion of shorter radial extent.

10. In couplings as in claim 9, said gasket webs being rectangular in cross section, having a bottom edge substantially parallel to said base and a free side edge substantially parallel to the longer of said sides.

11. In couplings as in claim 8, said gasket including a radially inwardly extending leg positioned intermediate said sides and extending, when said gasket is confined by said housing, to a position radially inwardly of the key section of said rim of greater radial extent.

12. In couplings as in claim 11, said webs extending to and terminating at said leg.

13. In couplings as in claim 8, said webs having a free edge extending diagonally between the longer of said sides and the inner surface of said base.

14. A joint between pipes of different diameters which comprises, a pair of pipe sections positioned end to end, one having a greater diameter than the other, the end face of the larger diameter pipe being exposed radially outwardly of the end of the smaller diameter pipe, each of said pipe sections being formed with circumferential grooves therein adjacent, but spaced from, the end faces thereof leaving gasket engaging surfaces on the exteriors of said pipes between said grooves and said end faces, clamp type couplings surrounding said pipes, said couplings being generally C shaped in cross section, having a base portion with radially inwardly extending rims at the ends thereof, said rims terminating in key sections formed for reception in said pipe grooves, the rim at one longitudinal end of said coupling having a greater radial extent than the other of said rims for engagement of the key section carried by the same within the groove of the smaller diametered one of said pipes, a pressure responsive gasket generally C shaped in cross section received within said C shaped coupling housing, said gasket having a base portion with radially inwardly extending sides at the ends thereof providing a hollow therewithin, one of said sides of said gasket being longer than the other thereof, oppositely inwardly extending lips carried at the inner ends of said sides with the lip on the longer of said sides engaging the gasket surface of said pipe of smaller diameter, transversely extending web means within said hollow of said gasket positioned at uniformly spaced intervals around the circumference of said gasket, said web means being integrally secured to the inner face of the longer of said sides and the inner face of the base of said gasket, said webs serving to resist movement of said longer side toward said shorter side, all of said webs being free froM engagement with said shorter side of said gasket.

15. A joint as in claim 14, said webs having an edge portion engaged with the end face of said larger diameter pipe.

16. A joint as in claim 14, said webs being rectangular in cross section, extending radially inwardly with respect to the lip carried by the shorter of said gasket sides, and having an edge face of said radially inwardly extending portion of said webs engaging said end face of said pipe of greater dimension.

17. A joint as in claim 14, said gasket including a radially inwardly extending leg, said leg extending into, filling the space between, and engaging the end faces of said pipe sections terminating at the inner surface of the smaller of said pipe sections.

18. A joint as in claim 17, the face of said leg extending from the inner surface of the larger of said pipes to the inner surface of the smaller of said pipes being on a convex curve.

19. A joint as in claim 17, said webs extending between said longer side of said gasket and the opposed face of said leg and extending radially to a position opposite the end face of said pipe section of larger diameter.