Abstract: The present invention pertains to a clamp that includes a collar. The collar has first and second ends from which first and second lugs extend. Each of the first and second lugs has a thick portion and a thin portion, and the lugs are connected by a fastener. The clamp is positioned around tubes, and the fastener is tightened to tighten the clamp around the connection. The fastener may be tightened from an open position OP, when the lugs are not touching, to a closed position CP, when the thick portions of the lugs are touching. The fastener may be tightened further to a third position, so that the thin portions of the lugs move closer to one another. The clamp may also include a hinge area in which a gasket seal may be attached to the clamp or one of the tubes.

Abstract: A self tightening hose clamp is disclosed, having a band for encircling at least a portion of circumference of a hose and a bolt which extends from a left end of the band through the right end of the band and about the remaining portion of the circumference of the hose. A spring circumscribes an outer end of the bolt and applies a biasing force on the bolt and the right end of the band to maintain a clamping force between the band and the hose during contraction of the hose. A sleeve is disposed between the bolt and spring to coaxially center the spring about the bolt during compression.