Plastic coupling for plastic tubing
AssigneesNisso Engineering Co., Ltd., Fluoroware, Inc.
InventorsYasukatsu Nishikata, Hidenori Maeba, Takao Nakazawa
Life of this patent
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Abstract
A plastic coupling for plastic tubing having a groove annulus formed between a first circumferential groove on the outer periphery of the enlarged diameter portion of a connection tube and a second circumferential groove on the inner periphery of a cap nut 5 when the cap nut 5 is mounted on a joint body, and an enlargeable split ring having an internal diameter smaller than the external diameter of the enlarged diameter portion and loosely fitted into the second groove, the split ring being adapted to slide on the enlarged diameter portion to the first groove until the split ring falls within the first groove and is located within the groove annulus when the cap nut is mounted on the joint body.
Claims5
A high temperature resistant plastic coupling for plastic tubing comprising,
- a main joint body comprising a central fluid passage and a tip sleeve portion with an outer periphery, the main joint body also comprising an external thread adjacent to the tip sleeve portion,
- a plastic connection tube comprising a central passage with the approximate size of said central fluid passage of the main joint body, the plastic connection tube also comprising a flared end portion received onto the outer periphery of the tip sleeve portion of the main joint body in tight fitting relation, the flared end portion having an outer periphery with a first circumferential groove formed therein,
- a cap nut comprising an outer end portion with a bore therethrough receiving the plastic connection tube therethrough and also comprising an open inner end portion with an inner periphery extending along and embracing the flared end portion of the plastic connection tube and said first circumferential groove thereof, said inner periphery of the cap nut also comprising an internal thread threaded onto the external thread of the main joint body, the inner periphery of the cap nut also comprising a second circumferential groove positioned directly opposite said first circumferential groove in the flared end portion of the plastic connection tube,
- and a resiliently deformable split ring residing in said first circumferential groove and embracing the flared end portion of the plastic connection tube, said split ring also residing in the second circumferential groove of the cap nut, the split ring having an inner periphery with a diameter less than the diameter of the outer periphery of the flared end portion of the plastic connection tube.
Dependencies are inferred from the claim text.