Abstract: A vibrator has a hollow body with two end walls, a first piston slidably housed within the body, a first chamber defined therein and communicating with an inlet and bounded by a first active surface of the first piston, and a second chamber bounded by a second active surface of the piston, larger than and opposite the first active surface. The first piston slidingly houses a switch unit having at least one second piston and controlled by a fluid switch circuit having an inlet portion formed in the first piston and communicating with the first chamber. An outlet portion is formed in the first piston and communicates with the outlet. A switch portion, which is defined by the switch unit, communicates with the second chamber, and connects the second chamber to the inlet portion and to the outlet portion alternately as a function of the switch unit's axial position.

Abstract: A vibrator has a hollow body with two end walls, a first piston slidably housed within the body, a first chamber defined therein and communicating with an inlet and bounded by a first active surface of the first piston, and a second chamber bounded by a second active surface of the piston, larger than and opposite the first active surface. The first piston slidingly houses a switch unit having at least one second piston and controlled by a fluid switch circuit having an inlet portion formed in the first piston and communicating with the first chamber. An outlet portion is formed in the first piston and communicates with the outlet. A switch portion, which is defined by the switch unit, communicates with the second chamber, and connects the second chamber to the inlet portion and to the outlet portion alternately as a function of the switch unit's axial position.

Abstract: A machine (1) (42) wherein a frame (2) supports at least one operating head (34) (34a, 34b) via the interposition of an actuating device (4) for enabling the operating head (34) (34a, 34b) to move in relation to the frame (2) within a predetermined volume; and wherein the actuating device (4) is defined by two electric motors (14,24), the respective axes (6,21) of which are parallel to each other; and wherein a rotor (15) of one (14) of the two motors (14,24) is supported by the frame (2) and eccentrically supports a stator (23) of the other motor (24), a rotor (25) of which supports a straight guide member (31) in turn supporting a powered slide member (33) in turn supporting the operating head (34) (34a, 34b).

Abstract: A toolhead (9) wherein the spindle (21) of the tool (11) is rotated about its axis (10) and in relation to the casing (12) of the toolhead (9) by a first motor (28), and is moved along the axis (10) by a drive (38) activated by a second motor (39); the spindle (21), motors (28)(39) and drive (38) being mutually aligned along the axis (10) of the spindle (21), and being housed inside the sleeve (16) supporting the spindle (21).

Abstract: A seal for a thread drive including several ring parts arranged one within the other, to provide a dependable and compact unit comprised of a few parts. A sealing ring which surrounds and rests against the threaded spindle is comprised of rigid plastic. The sealing ring is a single thread section with axially separated ends which are integrally joined together by a transverse connection which closes the thread gap between the separated ends. A pretensioned tension ring surrounds the sealing ring. A housing ring surrounds both other rings. A wiper or scraper may be located on the sealing ring opposite the transverse connection.