Abstract: The invention relates to a device for drying compressed air comprising a substantially cylindrical, innerly hollow, container (19), provided, above, with an inlet hole (2) for the compressed air and with an outlet hole (24) for the compressed air, and at the bottom, with a chamber (21) for collecting condensed air and with means for extracting the same, at least an expansion chamber (3), communicating with said inlet hole (2), at least a laminating flange (4, 5), provided, downward said expansion chamber (3), with holes (6) for the passage of the compressed air, at least a spiral conical expander (10), provided with fins, and an inner canalization (23) for the rising of the compressed dehumidificated air toward the outlet hole.

Abstract: A retractable truck bed cover device is disclosed having a cover comprising a plurality of interconnecting slats, a powered drive mechanism including a rotating sprocket that interstitially engages said cover to move the cover between extended and retracted positions, and a support for said cover at its side edges. In a preferred embodiment, the drive mechanism and support are adapted so that the inventive device can be installed in truck beds of various sizes.

Abstract: A grinding tool comprises an endless abrasive belt looped around a drive pulley 2 and an idler pulley 23 and straddling therebetween a first arm 6 and a second arm 18. Tension is maintained in the belt by biasing element 10 acting on an end of the first arm. The first arm 6 is mounted in a slide assembly 4 which includes elements 5,7,8 for preventing the arm from sliding back into the assembly in use. The second arm 18 is pivotally mounted in a tracking head assembly 14 on an end of the first arm 6, with lateral biasing elements 16, 17 acting on respective opposing sides of the end portion of the second arm 18. This permits tilting of the idler pulley 23 to obtain correct tracking of the belt, and enables the arm 18 and the belt to be rapidly and easily changed.