초록 ▼

A liquid tight connector for non-metallic conduit is formed of a one piece body having a through bore. A sleeve extends inwardly from one end of the body and a threaded nipple extends inwardly from the other. Projecting transversely from the inner end of the nipple is a flange. A ferrule skirt exte

A liquid tight connector for non-metallic conduit is formed of a one piece body having a through bore. A sleeve extends inwardly from one end of the body and a threaded nipple extends inwardly from the other. Projecting transversely from the inner end of the nipple is a flange. A ferrule skirt extends from the flange toward the sleeve end of the body to define an annular channel concentric with the sleeve. An internal buttress thread is formed on the inner wall of the skirt. An end of a length of conduit is slipped over the end of the sleeve and into the mouth of the channel. The connector is rotated relative to the conduit, with the thread engaging an outer wall of the conduit to tightly draw the channel over the conduit. An outward flare is provided at the flange end of the sleeve to compress and seal the conduit.

대표청구항 ▼

Having thus described the invention there is claimed as new and desired to be secured by Letters Patent: 1. A liquid tight connector for non-metallic electrical conduit, the connector comprising a one-piece unitary thermoplastic body having a bore therethrough, the body including a cylindrical slee

Having thus described the invention there is claimed as new and desired to be secured by Letters Patent: 1. A liquid tight connector for non-metallic electrical conduit, the connector comprising a one-piece unitary thermoplastic body having a bore therethrough, the body including a cylindrical sleeve, a ferrule skirt coaxial with the sleeve, the ferrule skirt having a cylindrical inner wall, the connector having an annular cylindrical channel defined by the sleeve and the inner wall, a thread formed on the inner wall, the thread extending radially into the channel, the sleeve being dimensioned such that it may be received within an end of a length of selected non-metallic conduit and the non-metallic conduit may be slipped over the sleeve and into the channel, the channel having a blind end and the sleeve including an outward flare adjacent the blind end, the flare extending toward the cylindrical inner wall, at least a portion of the flare being axially registered with a portion of the thread, whereby upon rotation of the connector relative to the conduit, the thread engages an outer surface of the conduit and draws the conduit into the channel and the end of the conduit is tightly compressed against the portion of the thread and sealed in the channel between the flare and the cylindrical inner wall. 2. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 1 wherein the flare extends to the cylindrical inner wall. 3. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 1 wherein the body is formed of polyvinyl chloride. 4. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 1 wherein the thread comprises a buttress thread, whereby high resistance against tensile force separation is attained. 5. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 1 wherein the body further includes a nipple, the bore extending through the nipple, whereby the connector may be fastened to an electrical junction box with a conventional nut inserted over one end of the nipple. 6. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 5 wherein the body includes a transverse flange, the flange being positioned at the other end of the nipple, the flange being dimensioned to engage an exterior surface of an electrical junction box when the nipple is inserted through an opening in the electrical junction box. 7. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 6 wherein the sleeve and the nipple are coaxial. 8. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 6 wherein the nipple extends along an axis perpendicular to and intersecting the axis of the sleeve, whereby an elbow connector is provided. 9. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 6 wherein the ferrule skirt extends from the transverse flange. 10. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 1 wherein the outer surface of the ferrule skirt includes a plurality of planar faces whereby the body may be gripped by a suitable tool. 11. A liquid tight connector for non-metallic electrical conduit as constructed in accordance with claim 4 wherein the buttress thread projects radially inwardly from the inner wall of the ferrule skirt a distance less than 1.0 mm. 12. A method of connecting a length of flexible non-metallic electrical conduit to an electrical junction box having an access aperture, the method comprising the steps of: a) providing a one piece molded thermoplastic connector having a smooth walled cylindrical sleeve at one end, a threaded nipple at the other end, a transverse flange intermediate the ends and a bore extending from end to end, b) surrounding at least a portion of the smooth walled sleeve with a concentric cylindrical wall to provide an annular cylindrical channel, c) providing a thread projecting radially inwardly from the cylindrical wall and into the channel, d) dimensioning the smooth walled sleeve and the cylindrical wall such that an end of a length of flexible non-metallic electrical conduit can be received within the channel, e) inserting the smooth walled sleeve into an end of the length of conduit, f) sliding the conduit over the smooth walled sleeve and into the channel, g) seating the conduit within the channel by engaging a surface of the conduit with the thread and providing relative rotation between the connector and the conduit, h) sealing the conduit by forcing an end portion of the conduit against the cylindrical wall, i) inserting the nipple through the access aperture of the electrical junction box, and j) fastening the connector to the electrical junction box by threading a nut over the nipple and tightening the nut until the flange abuts an outer surface of the electrical junction box. 13. A method of connecting a length of flexible non-metallic electrical conduit to an electrical junction box in accordance with claim 12 wherein the end portion of the conduit is forced against the cylindrical wall by providing the smooth walled sleeve with an outward flare adjacent an interior end of the channel. 14. A method of connecting a length of flexible non-metallic electrical conduit to an electrical junction box in accordance with claim 13 wherein the outward flare overlies a portion of the thread. 15. A liquid tight connector for non-metallic flexible electrical conduit, the connector comprising a one-piece thermoplastic body, the body having a cylindrical sleeve, a ferrule skirt overlying at least a portion of the sleeve and a nipple, the nipple being configured to join the coupling to an electrical junction box, a first end of the nipple coinciding with an end of the body and a second end of the nipple positioned intermediate the ends of the body, the body including a transverse flange at the second end of the nipple, the ferrule skirt including a cylindrical inner wall, the inner wall of the ferrule skirt and the sleeve defining a channel dimensioned to accommodate an end portion of a length of flexible non-metallic electrical conduit, a buttress thread projecting radially inwardly from the inner wall of the ferrule skirt into the channel and extending axially along the channel, the buttress thread being dimensioned to engage the outer surface of the end portion of the selected length of conduit, whereby rotation of the coupling relative to the conduit retentively seals the end portion of the selected length of conduit in the channel. 16. A liquid tight connector as constructed in accordance with claim 15 wherein the ferrule skirt extends from the flange. 17. A liquid tight connector as constructed in accordance with claim 15 wherein the buttress thread projects radially inwardly from the inner wall of the ferrule skirt a distance less than 1.0 mm. 18. A liquid tight connector as constructed in accordance with claim 15 wherein the cylindrical sleeve is smooth walled.