Restraining pipe joint

• US 4,878,698 A
• Filed: 10/13/1988
• Issued: 11/07/1989
• Est. Priority Date: 01/12/1987
• Status: Expired due to Term

• Current Assignee: Midland Manufacturing Corporation (Dover Corporation)
• Original Assignee: Midland Manufacturing Corporation (Dover Corporation)
• Inventors: Gilchrist, R. Fowler
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/257,241
• Time in Patent Office: 390 Days
• Field of Search: 285/114, 285/368, 285/337, 285/343, 285/342, 285/340, 285/332, 285/334.4, 285/175
• US Class Current: 285/342
• 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

Pipe joints, particularly a restraining joint for use in bell and plain pipe end assemblies. The joint includes a gland having a conical axial aperture which encircles the plain end of the pipe; a split ring also encircling the plain end of the pipe is set in juxtaposition with the gland and this ring includes a peripheral flange which seats in the gland. The split ring has a conical exterior complementally engaging the conical axial aperture in the gland and a plurality of pipe gripping teeth defined in its inner surface. A compressible gasket is interposed between the split ring and the pipe bell. The restraining joint is particularly effective in joining plastic pipe and bell assemblies.

Claims

1. A restraining pipe joint for use in a bell and plain pipe end assembly comprising:

a. a plain pipe end of plastic;

b. a bell which defines an opening wall of maximum radius relative to a center line of the joint, said opening wall joining a first conical shoulder of declining radius, a second shoulder of shortest radius, joining the first shoulder rearwardly to form within the bell a recess for the plain pipe end;

c. a gland encircling the plain pipe end, said gland defining a conical axial aperture interior wall which terminates short of its forward end forming in extension thereof an inclined interior peripheral abutment;

d. an elongated split ring likewise encircling the plain pipe end in juxtaposition with said gland and including;

i. a conical exterior wall complementally engageable by the conical axial aperture interior wall of said gland,

ii. a peripheral flange in forward extension of the conical exterior wall, directed outwardly from the plain pipe end, said flange defining at its end a forwardly inclined outer shoulder of positive angle relative to the center line of the joint and an inner rearwardly inclined inner shoulder of greater positive angle than the outer said shoulder of the flange, the inner shoulder of the flange being contiguously engageable by the inclined, interior peripheral abutment of the gland.

iii. a plurality of inwardly extending pipe end gripping teeth forming the inner surface of said split-ring, and

e. a compressible gasket encircling the plain pipe end, interposed between said split ring flange and the bell, said gasket defining a forwardly inclined packing ring shoulder, engageable in parallel with the forwardly inclined outer shoulder of said split-ring flange and an inwardly inclined outer shoulder, complementally contiguous with the first shoulder of the bell;

f. tightening means interconnecting said gland and the bell compressibly securing said gasket and said split-ring assembly within the pipe joint.

2. A restraining pipe joint for use in a bell and plain pipe end assembly as in claim 1, wherein said split ring upon compression has an inner diameter less than the outer diameter of said pipe, such that said gripping teeth bite into the pipe.

3. A restraining pipe joint for use in a bell and plain pipe end assembly as in claim 1, wherein said split ring is metal.

4. A restraining pipe joint for use in a bell and plain pipe end assembly as in either claim 1, 2 or 3, wherein said split ring is brass.