Hose clamp

Claim 1

An improved hose clamp comprising a tightening band bent to annular shape, end portions on said tightening band, transverse grooves provided in a first of said end portions of said tightening band, a screw worm having threads therein, said transverse grooves in said first end portion engaging in said screw worm threads, a sleeve enclosing said screw worm, said screw worm being rotatably journalled in said sleeve but axially non-slidable therein, a space in said sleeve allowing said threaded tightening band end portion to be moved out of said sleeve upon rotation of said screw worm therein, a second of said tightening band end portions opposite said first band end portion being fixed to said sleeve, a pressure strap bent to annular shape with its end portions overlapping, said tightening band being elastic in its lengthwise direction and enclosing said pressure strap, said pressure strap arranged to form a guide means to said screw worm sleeve and to said tightening band between said sleeve and said tightening band and an enclosed article, the improvement comprising said tightening band having an arcuate configuration in the plane of the external face of said pressure strap along the major portion of the circumference of said pressure strap, said arcuate configuration being adapted to resiliently deflect upon tightening of said tightening band for maintaining a substantial uniform pressure upon said pressure band during time.