Tube coupler, coupler held in sleeve by V-shaped grab ring

摘要

A tube coupling includes a socket 10 with an open end 16. A cartridge 18 with tapered internal cam surface 19 and tube locking collet 20 is mounted in the open end 16. The cartridge has an encircling rebate 21 at its outer end 22. The rebate has a V-shaped recess 23 in the inner corner of the rebate. A steel grab ring of V-shaped cross-section is mounted in the rebate. The ring has a short limb 24 which is trapped in the recess 23. The outer limb 25 of the grab ring bears against the inside surface of socket 10, to lock the cartridge in place. The ring has teeth around its periphery to increase its flexibility.