Pivotal hinge for an arm of an awning

Claim 1

A pivotal hinge for an arm of an awning of the type wherein a supporting block is tightly clamped onto a rectangular supporting tube and carries a pivotal bracket that is swingable and lockable about an axle disposed in parallel with the supporting tube, said hinge comprises: (a) the supporting block being in the configuration of a yoke including two legs joined by a central web, with one leg being defined by a pair of parallel webs; (b) a cross web connecting the parallel webs, the cross web including a semicylindrical groove formed between a pair of front surfaces, and a guide passage; (c) a pair of projections extending beyond the central web, with a pair of spaced eyes formed in the projections; (d) said axle being a supporting trunnion disposed in the pair of eyes; (e) said pivotal bracket supported on the supporting trunnion; (f) a threaded sleeve rotatably supported in the semicylindrical groove, the sleeve including a pair of spaced flanges which abut the front surfaces of the groove; (g) a helical spring tensioning one flange of the threaded sleeve against its corresponding front surface; and (h) a threaded bolt engaged through the threaded sleeve and guide passage, the bolt including one end pivotally connected to the pivotal bracket.