Abstract: A tool for tightening or loosening different elements unidirectionally, regardless of the direction of rotation of the input shaft (double-ratchet wrench). Includes a tool or tool accessory which can tighten or loosen screws unidirectionally, regardless of the direction of rotation applied at an input shaft (1), thereby reducing the number of movements required for existing tools to tighten or loosen, for example, a screw. The tool includes a casing (13) containing technology of the type used in energy converters, configured to convert movements in different rotational directions, applied at an input shaft (1), into unidirectional rotational movements at an output shaft (2), which is parallel to the input shaft; and is disposed such that a cutting plane can be drawn through the middle of the shafts, leaving the shaft ends (3.1, 3.2, 3.3, 3.4) visible or outside the casing, with the particularity that it is possible to couple to the input shaft at one end (3.1) or the other (3.

Abstract: A device, transmission and universal mechanical coupling which allows transforming rotating forces of different magnitudes and directions being applied on the same rotating shaft (1) and obtaining a unidirectional motion in an output shaft (2) which can be used in any environment. The device consists of an input shaft (1), an output shaft (2) and two linking means (3 and 5) and (4, 9, and 6) between these two shafts (1 and 2) which are provided with at least a unidirectional coupling device (7a and 7b) each, and which, in the most basic form thereof lacks of a rotation inverter (15a ).

Abstract: Device, transmission and universal mechanical coupling of forces of different magnitude and directions (D.T.A.M.U.). This utility model refers to a device, transmission and universal mechanical coupling which allows transforming rotating forces of different magnitudes and directions being applied on the same rotating shaft (1) and obtaining a unidirectional motion in an output shaft (2) which can be used in any environment. The device consists of an input shaft (1), an output shaft (2) and two linking means (3 and 5) and (4, 9, and 6) between these two shafts (1 and 2) which are provided with at least a unidirectional coupling device (7a, 7b) each, and which, in the most basic form thereof, lacks of a rotation inverter (15a).