Abstract: A cooling air filter for an electric motor, includes a filter with a planar shape and minimum dimension so as to cover the area of the slits of a covering casing of a fan for an electric motor for which it is intended; and the filter is housed in a support which is fixed in a steady and removable way on the surface of the casing; the support having a frame-like structure from which at least two arms extend, which are diametrically opposite in the frame-like structure, and which are provided at their end with fixing and gripping means of the arms on the casing itself; the fixing means being configured for the fast detachment from and hooking onto said casing.

Abstract: A cooling air filter for an electric motor, includes a filter with a planar shape and minimum dimension so as to cover the area of the slits of a covering casing of a fan for an electric motor for which it is intended; and the filter is housed in a support which is fixed in a steady and removable way on the surface of the casing; the support having a frame-like structure from which at least two arms extend, which are diametrically opposite in the frame-like structure, and which are provided at their end with fixing and gripping means of the arms on the casing itself; the fixing means being configured for the fast detachment from and hooking onto said casing.

Abstract: A shoe cleaning machine is provided with one group of brushes (11) comprising at least one brush (11) with bristles aligned in a certain direction (11a) and at least a second brush (11b) with bristles aligned perpendicular to those of the preceding brush. A pan (13) for collecting dirt is positioned under the group of brushes and at least one nozzle (11c) sprays water on the group. An operator arm (8) carries at least one last (4) to which a shoe to be cleaned is tied: the arm has a linear actuator (9) with certain positions of extension, and is also intermediate to, a rotary actuator (10) which rotates the arm with respect to the frame (1) of the machine, to move the said lasts from the loading station (3) to the group of brushes and on to the discharge (16).

Abstract: The device proposed for cleaning metal surfaces consist of pad (12, 34, 91) of insulating material held between a beak-shaped (11, 52, 94) electrode (10, 26, 46) and the metal surface (8) to be cleaned, plus a low-voltage a.c. power supply (2) which is connected via the other electrode to the metal (7). A pump supplies the pad with a highly corrosive, high-density, acid solution. The pad consists of a relatively thick hose or tape. The device has slots (36) into which the gases and vapors produced during cleaning are drawn by an extractor fan (40) and then passed through a washing bottle (41) where they are cleaned. The electrode may have various shapes, and it is possible to replace the tip (28, 94, 98). The electrode is preferably designed with bores through which the acid solution can be fed.