Push in plastic tube fitting

Details Push in plastic tube fitting Push in plastic tube fitting

1994-11-10

1996-12-17

Nicholson, Eric K.

Pipe joints or couplings

Movable jaw

Wedge bushing

285243, 285328, 285423, F16L 1700

Patent

active

055845134

ABSTRACT:
An improved plastic push in tube fitting includes a plastic body, an elastomer o-ring for sealing, and a plastic collet. The collet and o-ring are disposed in the body such that a tube can be pushed into the body through the collet and o-ring and held against withdrawal from the body by the collet. The collet is formed entirely of plastic and has a plurality of circumferential sections for encircling a tube pushed into the body. Each of the circumferential sections has a radially inwardly facing circumferential tube gripper. The tube gripper is formed by a ramp which faces a tube being pushed into the body so that the collet will encounter the ramp and move the circumferential sections radially apart. The gripper also includes a circumferential surface which faces away from a tube being pushed into the body. The circumferential ramp and the circumferential surface form a gripper edge at their junction and this edge engages and holds a tube pushed into the body through the collet. Preferably the ramp has an angle with respect to a tube pushed into the collet of between 15 and 40 degrees. Also preferably the internal angle between the circumferential ramp and the circumferential surface is between 75 and 120 degrees. The arcuate shape of the gripper edge is the same as the arcuate shape of the exterior of a tube pushed through the collet. The collet preferably is formed of hard plastics, such as poly (ether ether ketone), polyetherimide, polybutylene terephthalate, polyphthalamide and polymers of acetal homopolymer.

REFERENCES:
patent: 3214200 (1965-10-01), Carlson et al.
patent: 3653689 (1972-04-01), Sapy et al.
patent: 3743326 (1973-07-01), Courtot et al.
patent: 3884513 (1975-05-01), Gassert
patent: 4178023 (1979-12-01), Guest
patent: 4508369 (1985-04-01), Mode
patent: 4621842 (1986-11-01), Kowal et al.
patent: 4722560 (1988-02-01), Guest
patent: 5064223 (1991-11-01), Gross
patent: 5171045 (1992-12-01), Pasbrig

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