Pipe coupling with U-shaped spring ring

• US 5,273,322 A
• Filed: 01/04/1993
• Issued: 12/28/1993
• Est. Priority Date: 01/15/1992
• Status: Expired due to Fees

• Current Assignee: Straub Federnfabrik AG
• Original Assignee: Straub Federnfabrik AG
• Inventors: Straub, Immanuel
• Primary Examiner(s): Nicholson, Eric K.
• Application Number:
  US08/000,397
• Time in Patent Office: 358 Days
• Field of Search: 285/112, 285/111, 285/373, 285/105
• 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 includes a contractible housing 10, which receives an elastomer sealing sleeve 32 of C-shaped cross section, having sealing lips 36 extending towards each other. A meander-like spring ring 44, which is U-shaped in cross section and is provided with slots 74, is inserted in to the respective annular groove 42 in order to support the sealing lip 36 against the sleeve bar 34. Upon the contraction of the housing 10, the sleeve 32 is upended in the peripheral direction and the sealing lips 36 are brought to bear snugly against the pipe wall 55. At the same time, the spring ring 44 contracts as a result of a decrease in the width of the slots 74. The sealing lip 36 is supported by the spring ring 44 over a large area, and the flowing of material of the sleeve 32 in and through the slots 74 is prevented. The spring leg 68 projecting over the sealing lip 36 prevents any sticking of the torus 56 to the sleeve bar 34. This pipe coupling is suitable for use under high operating temperatures and large temperature changes.

Claims

1. In a pipe coupling of the type comprising:

an elastomer sealing sleeve of C-shaped cross section, said sealing sleeve defining a sleeve bar and a plurality of sealing lips supported on the sleeve bar to extend toward one another;

a contractible housing enclosing the sealing sleeve and defining a longitudinal gap;

said housing comprising a closing mechanism and an insert plate inserted between the sealing sleeve and the housing to bridge the longitudinal gap;

said sealing lips, prior to compression of the housing, defining an inside dimension greater than an outside dimension of pipes to be coupled, and upon compression of the housing being able to be upset in a peripheral direction and thereby pressed snugly against respective pipes;

the improvement comprising;

at least one spring ring comprising first and second spring legs joined together by a spring bar such that the spring ring is U-shaped in cross section;

said first and second spring legs each defining slots which radiate from the spring legs to the spring bar, said slots of said first spring leg overlapping said slots of said second spring leg at said spring bar;

said spring ring disposed in an annular groove defined by the sealing sleeve between the sleeve bar and one of the sealing lips;

said slots in the spring ring being narrowed to a selected minimal slot width upon compression of the housing to allow the spring ring to support the sealing lip over a large area.

2. The pipe coupling as claimed in claim 1, wherein at least one of the spring legs protrudes axially out of the annular groove and over a free end defined by the sealing lip.

3. The pipe coupling as claimed in claim 2, wherein the sealing lip, when the housing is compressed, is supported on the sleeve bar by means of a torus, which torus bears against the spring leg protruding over the free end of the sealing lip.

4. The pipe coupling as claimed in claim 3, wherein the torus is formed on said sealing lip at the end of the sealing lip and facing the sleeve bar, and wherein one of the first and second spring legs positioned adjacent to the sealing lip embraces the torus.

5. The pipe coupling as claimed in claim 1, wherein a circumferential angular rib is formed on the sleeve bar on an inner side, and wherein the annular rib is positioned adjacent to the annular groove.

6. The pipe coupling as claimed in claim 1, wherein the spring ring is configured as an open ring.

7. The pipe coupling as claimed in claim 2, wherein the spring leg that protrudes axially out of the annular groove is positioned adjacent the sealing lip.

8. In a pipe coupling of the type comprising:

an elastomer sealing sleeve of C-shaped cross section, said sealing sleeve defining a sleeve bar and a plurality of sealing lips supported on the sleeve bar to extend toward one another;

a contractible housing enclosing the sealing sleeve and defining a longitudinal gap;

said housing comprising a closing mechanism and an insert plate inserted between the sealing sleeve and the housing to bridge the longitudinal gap;

said sealing lips, prior to compression of the housing, defining an inside dimension greater than an outside dimension of pipes to be coupled, and upon compression of the housing being able to be upset in a peripheral direction and thereby pressed snugly against respective pipes;

the improvement comprising;

at least one spring ring comprising first and second spring legs joined together by a spring bar such that the spring ring is U-shaped in cross section;

said first and second spring legs each defining slots which radiate from the spring legs to the spring bar and overlap;

said spring ring disposed in an annular groove defined by the sealing sleeve between the sleeve bar and one of the sealing lips;

said slots in the spring ring being narrowed to a selected minimal slot width upon compression of the housing to allow the spring ring to support the sealing lip over a large area;

wherein at least one of the spring legs protrudes axially out of the annular groove and over a free end defined by the sealing lip;

wherein the sealing lip, when the housing is compressed, is supported on the sleeve bar by means of a torus, which torus bears against the spring leg protruding over the free end of the sealing lip.

9. The pipe coupling as claimed in claim 8, wherein the torus is formed on said sealing lip at the end of the sealing lip and facing the sleeve bar, and wherein one of the first and second spring legs adjacent to the sealing lip embraces the torus.