Pipe joint restraint
First Claim
Patent Images
1. A pipe joint restraint comprising:
- an annular retainer gland defining a pipe-receiving space therethrough and having an axial centerline;
at least one pocket associated with the annular retaining gland and having an opening confronting the pipe-receiving space and a top wall radially outwardly of the opening, the top wall defining at least one fulcrum fixed a predetermined distance from the axial centerline of the annular retainer gland;
a gripping element having at least one gripping edge adapted to engage a pipe received in the pipe-receiving space;
an adjustment member extending within the pocket and threadably coupled to the gripping element, wherein the adjustment member is pivotable about the at least one fulcrum with the gripping element such that the at least one gripping edge moves toward the axial centerline of the annular gland in response to movement, along the axial centerline of the annular gland, of a pipe received in the pipe-receiving space and engaged by the at least one gripping edge of the gripping element;
a stop associated with the pocket, the stop limiting pivotal movement of the gripping element about the at least one fulcrum; and
the at least one pocket further including a rear wall extending radially inwardly from the top wall, the stop defined on the rear wall.
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Abstract
A pipe joint restraint (16) includes a pocket (74) having a fulcrum (92) a fixed distance from the centerline (26) of an annular retaining gland (22) and about which a gripping element (76) pivots to move a gripping edge (75) toward the centerline (26) so as to grip a pipe (14) engaged by the gripping element (76) in response to thrust forces on the pipe (14). The length of gripping edge (75) is selected for the material of pipe (14). Adjustable element (78) operatively connects to the gripping element (76) and fulcrum (92) to pivot with the gripping element (76). Adjustable element (78) and may be torqued to a common, predetermined torque whether the pipe (14) is metal or polymeric.
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Citations
26 Claims
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1. A pipe joint restraint comprising:
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an annular retainer gland defining a pipe-receiving space therethrough and having an axial centerline; at least one pocket associated with the annular retaining gland and having an opening confronting the pipe-receiving space and a top wall radially outwardly of the opening, the top wall defining at least one fulcrum fixed a predetermined distance from the axial centerline of the annular retainer gland; a gripping element having at least one gripping edge adapted to engage a pipe received in the pipe-receiving space; an adjustment member extending within the pocket and threadably coupled to the gripping element, wherein the adjustment member is pivotable about the at least one fulcrum with the gripping element such that the at least one gripping edge moves toward the axial centerline of the annular gland in response to movement, along the axial centerline of the annular gland, of a pipe received in the pipe-receiving space and engaged by the at least one gripping edge of the gripping element; a stop associated with the pocket, the stop limiting pivotal movement of the gripping element about the at least one fulcrum; and the at least one pocket further including a rear wall extending radially inwardly from the top wall, the stop defined on the rear wall. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A pipe joint restraint comprising:
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an annular retainer gland defining a pipe-receiving space therethrough; at least one pocket associated with the annular retaining gland and having an opening confronting the pipe-receiving space and a top wall radially outwardly of the opening and said top wall having an aperture; a gripping element having at least a portion moveable within the at least one pocket and at least one gripping edge for engaging a pipe received in the pipe-receiving space; and an adjustment member extending into the at least one pocket through the top wall aperture so as to operatively engage the gripping element, the adjustment member including an interior shoulder inside the at least one pocket, an exterior shoulder outside the at least one pocket, and nut outside the at least one pocket, wherein the nut is configured to receive torque to rotate the adjustment member, and wherein the exterior shoulder is configured to contact the pocket top wall to retain the gripping element proximate the at least one pocket when the nut is removed from the adjustment member. - View Dependent Claims (25, 26)
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Specification