Pipe coupling

• US 4,664,422 A
• Filed: 07/15/1986
• Issued: 05/12/1987
• Est. Priority Date: 08/09/1985
• Status: Expired due to Term

• Current Assignee: Immanuel Straub
• Original Assignee: Immanuel Straub
• Inventors: Straub, Immanuel
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US06/885,784
• Time in Patent Office: 301 Days
• Field of Search: 285/373, 285/340, 285/112
• US Class Current: 285/112
• CPC Class Codes: F16L 17/04 with longitudinally split or divided sleeve
• CPC Class Codes: F16L 21/005 made of elastic material, e.g. partly or completely surrounded by clamping devices comprising packing adapted to sealing by fluid pressure F16L17/04, F16L11/20; hose clips F16L33/02
• CPC Class Codes: F16L 21/08 with additional locking means F16L17/035, F16L17/04, F16L21/04, F16L21/06 take precedence; screwed joints F16L19/08; couplings of the quick-acting type F16L37/00

Abstract

A pipe coupling comprising a housing which can be clamped about pipe ends which are to be interconnected possesses radially inwardly flexed end flanges. The housing encloses an inwardly open sealing gasket having a substantially C-shaped axial cross-sectional configuration made from an elastomeric material such as synthetic rubber. Both ends of this sealing gasket are supported upon the inner or confronting jacket surface of a respective truncated cone-shaped clamping ring. These clamping rings are supported in the housing at the region of their outer edge or outer region by means of the end flanges. The inner edge or inner region of these clamping rings is structured to mechanically engage or dig into the surface of the pipe ends during clamping of the housing. The inner edge or inner region of the clamping rings possesses a concave profile in order to reduce, on the one hand, the necessary force required during clamping of the housing for digging the inner edge or inner region into the pipe ends and, on the other hand, to clearly limit the depth to which the inner edge or inner region penetrates into the pipe ends.

Claims

1. A pipe coupling for coupling together the pipe ends of pipes having an outer surface and which are to be interconnected, comprising:

a housing for engaging the pipe ends with a clamping action;

said housing having two ends, an inner surface and a radially inwardly extending flange at each of said two ends and defining conjointly with said inner surface respective transition regions;

a sealing gasket of elastomeric material enclosed within said housing and possessing a substantially C-shaped axial cross-sectional configuration;

said sealing gasket being inwardly open and having end faces and sealing lips extending inwardly therefrom and each defining a sealing surface for engagement with the outer surface of the pipe ends to be interconnected;

a respective substantially frusto-conical clamping ring associated with each of said end faces and having an inner jacket surface confronting an associated one of said end faces;

each said substantially frusto-conical clamping ring having an outer edge of a larger diameter and an inner edge of a smaller diameter than said outer edge;

each said substantially frusto-conical clamping ring being supported at said outer edge thereof at an associated one of said respective transition regions;

each said substantially frustro-conical clamping ring being structured to mechanically engage at said inner edge an associated one of the pipe ends at its outer surface during said clamping action;

said inner edge of said respective substantially frusto-conical clamping rings possessing a concave profile; and

said concave profile defining a knife edge portion and a stop surface portion for limiting the extent of penetration of said knife edge portion into said outer surface of the pipe ends under said clamping action.

2. The pipe coupling as defined in claim 1, wherein:

said concave profile is substantially V-shaped.

3. The pipe coupling as defined in claim 2, wherein:

said substantially V-shaped concave profile exhibits an aperture angle; and

said aperture angle amounting to at least 90° and

at most 150°

.

4. The pipe coupling as defined in claim 1, wherein:

said inner edge of said respective substantially frusto-conical clamping rings being segmented.

5. A pipe coupling for coupling together the pipe ends of pipes having an outer surface and which are to be interconnected, comprising:

a housing for engaging the pipe ends with a clamping action;

said housing having two ends, an inner surface and an inwardly extending flange at each of said two ends and defining conjointly with said inner surface respective transition regions;

a sealing gasket enclosed within said housing;

said sealing gasket having end faces and sealing lips extending inwardly therefrom and each defining a sealing surface for engagement with the outer surface of the pipe ends to be interconnected;

a respective substantially tapered clamping ring associated with each of said end faces and having an inner jacket surface confronting an associated one of said end faces;

each said substantially tapered clamping ring having an outer region of a larger diameter and an inner region of a smaller diameter than said outer region;

each said substantially tapered clamping ring being supported at said outer region thereof at an associated one of said respective transition regions;

each said substantially tapered clamping ring being structured to mechanically engage at said inner region an associated one of the pipe ends at its outer surface during said clamping action;

said inner region of said respective substantially tapered clamping rings possessing a concave profile; and

said concave profile defining a knife edge portion and a stop surface portion for limiting the extent of pentration of said knife edge portion into said outer surface of the pipe ends under said clamping action.