UK Patent No. 2307531
This is a rugged, heavy-duty tensioner for use in all situations. At one end is a double-jaw claw-type connector, operated by a quarter turn of a knurled hand grip, which attaches to a securing ring or other suitable strong point. At the other end of the coupling is a chain, and, after all, the slack has been taken up, it is secured by means of a half-turn of the lock. Turning the built-in handwheel on the body of the coupling produces the required tension in the lashing. Quick release is effected by a quarter turn of the handgrip. The adjustment includes a vibration proof anti-back-off lock, applied automatically, disengaged by twisting the release sleeve.