Abstract: Portable corkscrew with accessory to shear the caps on the neck of bottles, the corkscrew comprising a grip (11), on substantially one end of which are pivoted a drawing screw (12) and a supporting lever (13), the shearing accessory (14) being located substantially at the other end (11a) of the grip (11) and comprising a plurality of shearing wheels, the shearing accessory (14) comprising at least two assemblies of wheels, a first assembly of wheels (15) and a second assembly of wheels (17) respectively, these two assemblies of shearing wheels (15, 17) being associated with respective supports, which are reciprocally movable and positionable and which define a first closed inactive position forming substantially a continuity of line together with the outer shape of the grip (11) of the corkscrew (10) and at least one second opened working position.

Abstract: Corkscrew (10) with a fitting (16) to shear tinfoil, plastic or other caps (17) on the upper part of the neck (18) of bottles (14) possibly including a collar, the corkscrew (10) comprising an at least partly flat grip (11) having a possible zone to contain a drawing screw (12), an element to anchor the drawing screw (12) and a short supporting element (13), cutting fitting (16) being included and consisting of small shearing wheel (22) cooperating with recess (19), which are substantially coherent with the outer diameter of the neck (18) of the bottle (14) and are associated with positioning and guide members (19-20-30-23) cooperating with the upper part of the neck (18) of the bottle (14).

Abstract: Screw (15) with differentiated sections for corkscrews (10) which consists of a pivotal (14) element (17) for connection to a lever body (11) of the corkscrew (10), a screw body (18) formed with a plurality of helices (19) and a point (20), the screw body (18) comprising at least two segments of a desired length (L1-L2), which contain a desired number (n1-n2) of helices (19) and consist of helics (19) having sections of a differentiated size (S1-S2), the section S2 being smaller than the section S1 by a desired value.

Abstract: A corkscrew having a lever of the second order that is rotatably connected to each of a support to engage a bottle and a screw. The corkscrew is so configured that one can vary the distance between a pivot of the screw and a rotatable connection pin between the lever and the support.