Abstract: A toggle-lever clamping device for clamping work pieces includes a box-shaped body which supports a clamping member movable between a forward disengaging position and a backward position for clamping the work piece. The device also includes control elements operatively connected to the clamping member by elements of an intermediate toggle-lever connecting link, and an articulated quadrilateral system; the intermediate connecting link is in the form of an axially yieldable flat spring having a plurality of side by side arranged elastically yieldable spring sections, aligned according to its longitudinal axis. The articulated quadrilateral system and the intermediate connecting link are constructed and disposed in such a way as to maintain an irreversible locking condition of the clamping member to clamp work pieces, compensating differences in thickness of the work pieces.

Abstract: A centering device provided with cleaning elements for cleaning a movable centering rod, and for preventing infiltration of dirt. The cleaning elements comprise at least one annularly-shaped scraping member provided with angularly spaced apart cross-cuts, which divide the scraping member into circular sections having inner scraping edges. The scraping member is locked against a conical shoulder in such a way as to be elastically yieldable, making the inner scraping edges of the sections adhere to the centering rod.

Abstract: A centering and/or clamping device for work pieces includes an operative unit including a first box-shaped body for supporting a movable retaining member for centering and/or clamping the work pieces, and sensing elements for detecting the position of the retaining member; the device also includes an actuation unit operatively coupled with the operative unit, which includes a second box-shaped body housing an electronic control unit and a supporting frame for supporting control elements of the retaining member. The operative unit and the actuation unit, which can be mechanically and electrically disengageably coupled together, are provided with disengageable electrical connecting elements, for connecting the detecting sensor, and, respectively, the control elements to the electronic control unit.

Abstract: An electrically operated actuator includes a box-shaped body to which an angularly movable rocking arm is pivotally connected; the actuator also includes control elements operatively connected to the rocking arm by a toggle-lever mechanism, the control elements in turn having at least one electric motor, and a connecting screw-nut mechanism. The actuator further includes a position transducer device of rotary and absolute type, providing reference signals univocally related to the angular positions of the rocking arm, and a programmable electronic control unit and self-braking elements for the electric motor, the control unit being programmed to control the angular rotation of the rocking arm and to actuate the self-braking elements for the electric motor, in relation to the control signals provided by the absolute transducer device.

Abstract: An electrically actuated linear actuator capable of simulating the performances of a pneumatic cylinder; the actuator includes a gear reduction unit connected to a slidable rod via a drive device including a screw-nut assembly. The gear reduction unit is slidably supported and, at the end of the working stroke of the actuator, is moved backwards by the rotation of the screw of the drive device, against biasing springs which provide a forward thrust on the rod. An electronic control unit selectively controls the power supply to the electric motor and to a locking brake, in relation to control signals emitted by a rotary signal generator.

Abstract: A toggle-lever clamping device for clamping work pieces includes a box-shaped body which supports a clamping member movable between a forward disengaging position and a backward position for clamping the work piece. The device also includes control elements operatively connected to the clamping member by elements of an intermediate toggle-lever connecting link, and an articulated quadrilateral system; the intermediate connecting link is in the form of an axially yieldable flat spring having a plurality of side by side arranged elastically yieldable spring sections, aligned according to its longitudinal axis. The articulated quadrilateral system and the intermediate connecting link are constructed and disposed in such a way as to maintain an irreversible locking condition of the clamping member to clamp work pieces, compensating differences in thickness of the work pieces.

Abstract: The toggle-lever clamping device comprises a box-shaped body provided with a clamping member movable between an advanced and a retracted position in which it disengages and respectively locks a work piece. The clamping member is arranged on a side of the box-shaped body and is operatively connected to a linear actuator by an articulated quadrilateral system and an intermediate toggle-lever connecting link. The clamping member extends from the box-shaped body in a substantially orthogonal direction to the linear actuator, and the articulated quadrilateral system and the intermediate toggle-lever link are constructed and arranged to transform a linear movement of the actuator into a composite racking and linear movement of the clamping member to retain and disengage a work piece.

Abstract: A clamping device for clamping work pieces; the clamping device comprises a box-shaped body, a clamping member, and a manually operable control lever; first and second toggle-lever system and an intermediate guide member are provided to connect the control lever to the clamping member of the device. The first and the second toggle-lever systems are constructed and arranged to act in correlation, in such a way that in the clamping condition of the device, the pivotal axes and the intermediate hinge axis of the second toggle-lever system, in the advanced condition of the clamping member are arranged on reference lines forming a small angle against a stop.

Abstract: The apparatus comprises a box shaped body and a clamping member, movably supported between first and second operative positions to lock and respectively release a work piece. A linear detecting device generates a set of control signals for a control unit, during the movement between the operative positions of the clamping arm. The detecting device comprises a first and a second sensor and indexing means in the form of a comb-shaped member having spaced apart teeth to sequentially activate the sensors and provide the set of control signals during the movement of the clamping member.

Abstract: The clamping device for clamping work pieces comprises a box-shaped casing and a pivotally supported clamping arm operatively connected to a control actuator. The clamping device comprises at least a first and a second sensor for detecting and monitoring operative positions of the clamping arm; the sensors are adjustably fastened to a base plate comprising a plurality of anchoring bushes for the sensors spaced apart and aligned in a longitudinal direction of a base plate. Each sensor is removably secured to the base plate by fasteners, which engage with respective anchoring bushes.

Abstract: The apparatus comprises a clamping device having a box-shaped casing and a clamping member for clamping work pieces, operatively connected to an electric actuator to move the clamping member between a first and a second operative position. The clamping apparatus is also provided with electric switching means which can be manually operated by a control member to reverse the polarities of the power voltage supply to the electric actuator, to selectively control the movement of the clamping member in respect to both operative positions; the control member may be in the form of a manually operable lever or control buttons.

Abstract: The clamping device for clamping work pieces comprises a box-shaped body, and an angularly movable clamping arm, operatively connected to an electric control actuator by a toggle-lever mechanism and an axially extensible thrust member. The toggle-lever mechanism comprises a connecting link having first and second link sections hinged on opposite sides of a crank member of the clamping arm, and to a screw and nut mechanism of the thrust member. The screw slides in an axial through bore which extends along the thrust member and through a hole in a hinge pin which connects the thrust member to the sections of the connecting link.

Abstract: A centering device provided with cleaning means for cleaning a movable centering rod, and for preventing infiltration of dirt. The cleaning means comprise at least one annularly-shaped scraping member provided with angularly spaced apart cross-cuts, which divide the scraping member into circular sections having inner scraping edges. The scraping member is locked against a conical shoulder in such a way as to be elastically yieldable, making the inner scraping edges of the sections adhere to the centering rod.

Abstract: The clamping device comprises a box-shaped body provided with a clamping member movable between a forward position and a backward position. Control means are provided for controlling the movement of the clamping member; the control means comprise a thrust member operatively connected to the clamping member by an articulated quadrilateral system, and a toggle-link, in which the hinge point of the link, in the backward position of the clamping member are disposed on opposite sides of the thrust member. The device also comprises scraping means for cleaning the clamping member and to prevent the infiltration of dirt.

Abstract: A clamping device for clamping work pieces; the clamping device comprises a box-shaped body, a clamping member, and a manually operable control lever; first and second toggle-lever system and an intermediate guide member are provided to connect the control lever to the clamping member of the device. The first and the second toggle-lever systems are constructed and arranged to act in correlation, in such a way that in the clamping condition of the device, the pivotal axes and the intermediate hinge axis of the second toggle-lever system, in the advanced condition of the clamping member are arranged on reference lines forming a small angle against a stop.

Abstract: A pressure equalizer device for load balancing systems; the device comprises an hollow body (16) defining a pressure equalizing chamber having fluid inlet and outlet apertures at opposite ends thereof, and a pressure release valve on the outlet side of the chamber; the pressure release valve is actuated by a floating pilot piston urged by a biasing spring to close the valve; at least one unidirectional flow passage, 23) is provided between the two side of pressure equalizing chamber to feed the pressurized fluid on both sides of the floating pilot piston of the device.

Abstract: A pneumatic, rotary, rack and pinion actuator with counter-pressure actuated damping device. The actuator comprises first and second rack and piston assemblies reciprocable inside corresponding pneumatic cylinders, which engage on the opposite sides of a pinion and output shaft. Each rack and piston assembly is provided with an axially extending duct opening at opposite ends into a drive chamber and a counter-pressure control chamber, respectively; counter-pressure control and damping means are provided in the piston-assemblies and cylinders, comprising a throttling valve opening into the control chamber and a check valve in said ducts; a thrust pin member protrudes in the control chamber and into the duct end to open the check valve and feed in a controlled manner pressurised air from the drive chamber into the control chamber, before each rack and piston assembly reaches the end of its stroke.

Abstract: A sealing device for a rodless pneumatic cylinder comprising a hollow body having an elongated chamber in which a reciprocating piston slides. The cylinder has a longitudinal slot and sealing means in the form of a flexible strip passing through a longitudinal passageway in the piston; the sealing strip has a width greater than that of the slot and longitudinally extending retaining bead members engaging and disengaging grooves inside the cylinder body, spaced apart from the central slot. The sealing strip also comprises sealing lips fitting against bevelled edges on a side of the retaining grooves. The strip is provided with a reinforcement to withstand the mechanical stresses caused by the reciprocating piston.