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US3885818A Expired / Lapsed US ⏱️ 0.0 years remaining

Insulated coupling joint

Assignee: Mueller Co
•
Filing: 1974-04-02
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Granted: 1975-05-27
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Expires: 1994-04-02
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Abstract

Abstract A mechanical joint for an insulated line is disclosed which includes a joint fitting having a cylindrical passageway therethrough for receiving at least two pipes which are to be mechanically joined but electrically insulated from one another. At one end, the fitting is connected directly by a suitable mechanical means to one of the pipes which extends into the passageway. At the other end of the fitting, an annular groove is formed about the inside periphery of the fitting so that a deformable ring gasket, formed of an electrical insulating material, can be positioned in the groove between a second pipe and the fitting. A gasket follower ring is positioned next to the ring gasket in the annular groove and a means is provided for pressing the gasket follower against the ring gasket so as to deform the gasket to grip the pipe positioned within the passageway. At least one insert receiving cast groove is also formed in the fitting proximate the end of the fitting and has a relatively large opening into the passageway therethrough and has a relatively small opening to the outside periphery of the fitting. A lock insert formed of an electrical insulating material is positioned in each groove and a cup-pointed set screw is threaded therethrough from the outside of the fitting until the set screw engages the pipe to a predetermined depth, thereby locking the pipe in position with respect to the fitting.

Inventors

  • 👤 Paul R Ammann

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 04:16
CPC Classifications
F; F16; F16L; F16L25/00; F16L25/02; F16L25/028

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 239 words
An insulated coupling joint comprising: a fitting for mechanically connecting at least two pipes wherein said pipes are electrically insulated from one another, said fitting having at least one cylindrical pipe receiving passageway therethrough, an annular groove extending about the internal periphery of a first end thereof, and at least one insert receiving hole proximate said first end of said passageway, said hole extending radially from said passageway to the outside periphery of said fitting, a deformable gasket formed of an electrical insulating material positioned in said annular groove, a lock insert positioned in each of said insert receiving holes, said lock insert being an electrical insulator and having a threaded hole therethrough, means for inhibiting the rotation of said lock insert with respect to said fitting, means for preventing the radial movement of said lock insert with respect to said hole, a set screw threaded through said lock insert, and an insulator sleeve positioned about the portion of a pipe which extends into said first end of said passageway of said fitting, said set screw being threaded until the end thereof cuts through said insulator and into said pipe to a predetermined level, means for deforming said gasket in a radial direction to thereby cause said gasket to grip and retain said pipe, and means for securing the other end of said fitting to a pipe which extends into the passageway at said other end of said fitting.
Claim 2
Dependent Claim 239 words
An insulated coupling joint comprising: a fitting for mechanically connecting at least two pipes wherein said pipes are electrically insulated from one another, said fitting having at least one cylindrical pipe receiving passageway therethrough, an annular groove extending about the internal periphery of a first end thereof, and at least one insert receiving hole proximate said first end of said passageway, said hole extending radially from said passageway to the outside periphery of said fitting, a deformable gasket formed of an electrical insulating material positioned in said annular groove, a lock insert positioned in each of said insert receiving holes, said lock insert being an electrical insulator and having a threaded hole therethrough, means for inhibiting the rotation of said lock insert with respect to said fitting, means for preventing the radial movement of said lock insert with respect to said hole, a set screw threaded through said lock insert, and an insulator sleeve positioned about the portion of a pipe which extends into said first end of said passageway of said fitting, said set screw being threaded until the end thereof cuts through said insulator and into said pipe to a predetermined level, means for deforming said gasket in a radial direction to thereby cause said gasket to grip and retain said pipe, and means for securing the other end of said fitting to a pipe which extends into the passageway at said other end of said fitting.
Claim 3
Dependent Claim 97 words
The insulated coupling joint of claim 1 wherein said means for preventing the radial movement of said lock insert with respect to said insert receiving hole comprises said insert receiving hole having a larger opening into said cylindrical passageway than the opening to the outside periphery of said fitting, and said lock insert having a relatively large base portion and a relatively small outer end portion wherein said outer end portion communicates with said hole at the external periphery of said fitting and said base portion is positioned in said insert receiving hole proximate said cylindrical passageway.
Claim 4
Dependent Claim 54 words
The insulated coupling joint of claim 2 wherein said lock insert includes a base portIon and a neck portion, said neck portion extending through said insert receiving hole in said fitting to the outside periphery thereof and said base portion being positioned in said insert receiving hole proximate the cylindrical passageway through said fitting.
Claim 5
Dependent Claim 51 words
The insulated coupling joint of claim 2 wherein said means for inhibiting the rotation of said lock insert with respect to said fitting includes said insert receiving hole through said fitting being non-cylindrical and said lock insert having an external configuration which mates with said insert receiving hole through said fitting.
Claim 6
Dependent Claim 15 words
The insulated coupling joint of claim 1 wherein said set screws have a cup-pointed end.

References Cited (Backward Citations)

US2309253A Cited
US3028180A Cited
US3103887A Cited
US3623968A Cited
US3650547A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-05-26 1978-11-25 1979-05-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-05-26 1982-11-25 1983-05-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-05-26 1986-11-25 1987-05-27 $7700.00 Window Closed / Lapsed

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