Plastic pipe and duct joint connections

• US 6,409,229 B1
• Filed: 11/13/2000
• Issued: 06/25/2002
• Est. Priority Date: 11/13/2000
• Status: Expired due to Fees

• Current Assignee: SHEA Technology
• Original Assignee: SHEA Technology
• Inventors: Shea, Lawrence E.
• Primary Examiner(s): Nicholson, Eric K.
• Application Number:
  US09/711,719
• Time in Patent Office: 589 Days
• Field of Search: 285/371, 285/21.1, 285/21.2, 285/915, 285/285.1, 285/423, 428/36.9, 156/330, 156/92
• US Class Current: 285/371
• CPC Class Codes: B29C 65/483 Reactive adhesives, e.g. chemically curing adhesives
• CPC Class Codes: B29C 65/5042 covering both elements to be joined
• CPC Class Codes: B29C 65/7802 Positioning the parts to be joined, e.g. aligning, indexing or centring
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/1142 Single butt to butt joints
• CPC Class Codes: B29C 66/5221 for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
• CPC Class Codes: B29C 66/52295 said socket comprising reinforcements
• CPC Class Codes: B29C 66/52297 said socket comprising slip-off prevention means B29C66/52296 takes precedence
• CPC Class Codes: B29C 66/52298 said socket being composed by several elements
• CPC Class Codes: B29C 66/636 using a support which remains in the joined object
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29K 2027/06 PVC, i.e. polyvinylchloride
• CPC Class Codes: B29K 2105/06 containing reinforcements, fillers or inserts
• CPC Class Codes: B29K 2309/08 Glass
• CPC Class Codes: B29K 2995/0016 Non-flammable or resistant to heat
• CPC Class Codes: B29L 2023/22 Tubes or pipes, i.e. rigid bent tubes not for use as pipe couplings B29L2023/004
• CPC Class Codes: F16L 13/103 Adhesive joints for hoses F16L33/34
• CPC Class Codes: F16L 47/02 Welded joints; Adhesive joints
• CPC Class Codes: Y10S 285/915 Mastic

Abstract

The invention relates to a joint assembly for connecting together fiberglass cylindrical pipe and duct sections up to about one hundred and twenry inches in diameter. An internal tubular slip collar fits into opposing sections joining the sectionend to end. An external tubular slip collar is mounted over the joined sections encircling their exterior surfaces. A non-volatile epoxy adhesive secures the mating surfaces forming a double adhesive sealed and three level joint.

Claims

1. A joint assembly for joining together end to end plastic pipe or duct sections having interior and exterior walls, comprising

an internal tubular resin slip collar having exterior walls with an outside diameter less than the diameter of said pipe and duct sections interior walls,

an external tubular resin slip collar having interior walk with an inside diameter greater than the diameter of said pipe and duct sections exterior walls,

whereby the internal slip collar is mounted with the joined pipe or duct sections interior walls,

whereby the external slip collar is mounted around the joined pipe or duct sections,

whereby the internal slip collar and joined pipe and duct sections are adhesively bonded together and the external slip collar and the pipe or duct sections are adhesively bonded together,

whereby the plastic pipe or duct sections comprie fiberglass and

the joint assembly has passed the Factory Mutual #4922 fire test.

2. The joint assembly according to claim 1 wherein the adhesive is non-volatile organic compound epoxy resin.

3. The joint assembly according to claim 1 whereby there is an exterior bead encircling the exterior walls of at least one of the internal or external slip collars dividing their exterior surfaces into two opposing exterior portions.

4. The joint assembly according to claim 1 wherein said duct or pipe sections have fire resistant resin outer surfaces and corrosion resistant resin inner surfaces.

5. The joint assembly according to claim 4 wherein said internal slip collar is prepared from the same corrosion resistant resin or other resins having equivalent corrosion resistance and at least equivalent fire resistance.

6. The joint assembly according to claim 5 wherein said other resins comprise epoxy or thermplastic resins.

7. The joint assembly according the claim 5 wherein said external slip collar is prepared from the same fire resistant resin.

8. The joint assembly according to claim 1 wherein said external slip collar is fabricated separately as a finished product ready for use.

9. The joint assembly according to claim 1 wherein the pipe or duct sections have diameters up to about one hundred and twenty inches.

10. The joint assembly according to claim 1 wherein the external slip collar comprises two half portions forming a clamshell type unit.

11. The joint assembly according to claim 1 wherein the external slip collar is mounted along with the internal slip collar on one end of the duct or pipe, prior to joining the pipe or duct sections together.

12. A method of joining together end to end fiberglass pipe or duct sections having interior and exterior walls comprising, adhesively mounting an internal tubular resin slip collar having exterior walls with an outside diameter less than the interior diameter of said pipe or duct sections within the interior of each pipe or duct section and joining them together, adhesively mounting an external tubular resin slip collar having interior walls with an inside diameter greater than the diameter of said pipe or duct sections around the joined pipe or duct sections to form a double adhesive sealed three pieces joined surfaces.

13. A method according to claim 12 whereby the adhesive is non-volatile organic compound epoxy resin.

14. The method according to claim 13 wherein the epoxy resin is applied under water.