Abstract: The hydraulic apparatus includes: at least a pumping device for pumping a fluid at a first pressure; at least a user device of the fluid at the first pressure; at least an emergency supply device connectable to the user device activating a connection; at least an activation device of the connection that can be operated at a second pressure of the fluid different from the first pressure and interposed between the user device and the emergency supply device, the activation device having an emergency configuration wherein both the pumping device and the emergency supply device are connected to the user device.

Abstract: A grooving machine efficiently and speedily forms different kinds of grooves on the surface of a plate work (W). The grooving machine comprises a work table (11) on which the work (W) is fixed, a frame (7), an X-axis slider (17) disposed above the work table (11) and horizontally movably supported by the frame (7), a Z-axis slider (19) vertically movably supported by the X-axis slider (17), a tool holder base (75) supported by the Z-axis slider (19), and different kinds of cutting tools (97A to 97C) attached to the tool holder base (75), for grooving the surface of the work (W). Any one of these cutting tools (97A to 97C) is indexed to a cutting position where the work (W) is grooved. The tool holder base (75) has a cutting liquid supply portion (109) for supplying cutting liquid to a cutting zone where the indexed cutting tool cuts the work (W), and a cutting liquid suction portion (111) for sucking and removing excessive cutting liquid.

Abstract: An apparatus is provided for machining a flat surface on a workpiece and comprises an annular frame on which an annular wheel is rotatably mounted around a predetermined axis of rotation. A plurality of circumferentially spaced cutting members are secured to one axial surface of the wheel and preferably these cutting members are broaching tools. At least one, and preferably a plurality of circumferentially spaced workpiece holding fixtures are also mounted to the frame so that each fixture is open to, spaced from and axially aligned with said axial surface of said wheel. Each fixture can hold one workpiece with the surface to be machined adjacent the axial surface of the wheel with the cutting members. The wheel is continuously rotatably driven by a suitable motor at a high rotational speed, i.e. in excess of 200 surface feet/minute, while a feed unit associated with each fixture selectively axially moves its fixture with its workpiece towards the wheel, i.e.