Pipe coupling

Claim 1

A coupling for connecting an end of a tube to an apertured plate, comprising a pair of slot means through the plate on respectively opposite sides of the aperture, a tube, a first pair of levers of the first class on respectively opposite sides of the tube and having resistance ends with hooks thereon extending through the slots in the plate, said first pair of levers being pivoted to said tube for swinging movement about axes disposed radially of the tube between locked positions in which the hooks engage over the plate at ends of the slots and an unlocked position in which the hooks are free from the plate at the slot ends, a second pair of levers of the first class being pivotal by means on said opposite sides of the tube for swinging about axes extending radially of the tube, said second pair of levers having resistance ends pivoted to force ends of the first pair of levers, and means connected to force ends of the second pair of levers for simultaneously swinging the same about their pivotal axes between opposite extreme positions whereby to swing the first pair of levers between their locked and unlocked positions, the pivotal means each comprising a link having one end supported by a pivot fixed with respect to the tube and another end pivotally supporting one of the second pair of levers for swinging about a shifting pivotal axis and constituting a toggle.