A work-holding device comprising a housing, at least one pin, a cover, and a flow regulation mechanism. The housing further comprising at least one chamber, the chambers having a first end, a second end, a fluid opening at the first end, and a pin opening at the second end. The pins having an actuating end and a base end. The pins are arranged in the chambers with the base end within the chamber and the actuating end extending through the pin opening. The flow regulation mechanism is attached to the cover and configured to regulate fluid flow into and out of the chambers.

A pneumatic clamping device includes a main body, a piston, a first linkage member and a second linkage member. The main body includes a chamber. The piston includes a pillar part. The first linkage member includes a first arm part and a second arm part. The second linkage member includes a third arm part and a fourth arm part. When the air is introduced into the chamber, the pillar part is gradually moved to push the first arm part and the third arm part, so that the second arm part is externally expanded relative to the fourth arm part. When the air is exited from the chamber, the pillar part is gradually moved to pull back the first arm part and the third arm part, so that the second arm part is internally retracted relative to the fourth arm part.

A device for holding in position a product to be processed includes a base connectable by magnetic interaction to a work surface of an apparatus for tumbling or polishing and comprising a first portion and a second portion movable along an operating direction mutually towards or away from a first and a second operating position. The device also includes a retaining support connected to the base and configured to hold in a stable position a product to be processed between a first and a second retaining element. Between the first and the second portion of the base an actuation member is interposed, configured to move the same portions between the first operating position and the second operating position. A method for holding in position a product to be processed is also disclosed.

A clamping apparatus includes: locking members (80) insertable into a hole (11) of a workpiece (10); and a clamp rod (70) configured to make a wedge engagement with the locking members (80) from above. Each locking member (80) includes a base portion (85) configured to be inserted into the hole (11); and a protruding portion (87) located above the base portion (85). A relative movement restriction mechanism (M) configured to restrict downward movement of the clamp rod (70) relative to the locking members (80) within a predetermined travel distance allows descent of outer peripheral surfaces (85a) of the base portions (85) relative to an inner peripheral surface of the hole (11) when the locking members (80) are in a diameter-expanded position.

According to one aspect, a pneumatic fixture clamp includes a housing having a rotational axis and a housing exterior surface. The housing exterior surface includes a workpiece engagement surface intersected by the rotational axis and configured for engaging a workpiece assembly, and a turntable engagement surface disposed on a side of the housing opposite the workpiece engagement surface, intersected by the rotational axis, and configured for engaging a turntable of a machine center. A chamber is defined in the housing between the workpiece engagement surface and the turntable engagement surface along the rotational axis. A piston slidably disposed in the chamber and configured for being driven between an extended position and a retracted position relative to the chamber. A fluid passage is defined in the housing, connected to the chamber, and configured for providing fluid from a fluid line to the chamber.

A clamping device and a machining method. The clamping device comprises: a base; a clamping head comprising a blind rivet and a locking member, the blind rivet comprising a middle column segment and enlarged portions at two ends, and the locking member being connected to an upper end of the blind rivet and defining a clamping opening; a lower cavity connected to the base; an upper cavity comprising an annular peripheral wall and a top wall having a central hole, the top wall being clamped between the two enlarged portions, the middle column segment of the blind rivet movably passing through the central hole, and the upper cavity being connected to the lower cavity in a fit manner; an elastic member located in the peripheral wall and supported between the enlarged portion at a lower portion of the blind rivet and the top wall; and a support cylinder movably fitted in the lower cavity, the support cylinder being supported below the elastic member.

The device (1) for restraining/locking mechanical parts on machines tools comprises: a hydraulic cylinder (2); a first piston (9) comprising a head (10) which projects from the hydraulic cylinder (2), the first piston (9) being slidable along a main line (B1); at least two self-centring locking elements (19) joined to the head (10) in such a way that they are movable along lines of sliding (B2) which are substantially transversal to the main line (B1); and movement means (21, 22) for moving the self-centring locking elements (19) between a retracted position and an extracted position, wherein the movement means (21, 22) comprise: a hydraulic chamber (21) made in the first piston (9); a second piston (22) which is slidable along the main line (B1) between a starting position and an arrival position and which comprises an operating portion (23) joined to the self-centring locking elements (19).

A tube coupling apparatus includes first and second clamping jaws that are mounted on a tool body. The clamping jaws are movable relative to each other between an open configuration in which they are receive a compressible tube connector, and a closed configuration in which they apply a compression force to compress the compressible tube coupling about one or more tube members. An actuator is arranged to move at least one of the clamping jaws to the closed configuration and a controller is operative to control the actuator. A sensor is provided that is arranged to determine a system parameter indicative of the compression force applied to the coupling by the clamping jaws and to progressively increase the compression force of the clamping jaws during a fitting operation. The controller monitors the system parameter data from the sensor and automatically controls the actuator to prevent the compression force exceeding a predetermined threshold based on the sensor data.

A pneumatic clamping device includes a main body, a piston, a first linkage member and a second linkage member. The main body includes a chamber. The piston includes a pillar part. The first linkage member includes a first arm part and a second arm part. The second linkage member includes a third arm part and a fourth arm part. When the air is introduced into the chamber, the pillar part is gradually moved to push the first arm part and the third arm part, so that the second arm part is externally expanded relative to the fourth arm part. When the air is exited from the chamber, the pillar part is gradually moved to pull back the first arm part and the third arm part, so that the second arm part is internally retracted relative to the fourth arm part.

The invention relates to a clamping device for a workpiece, comprising a lower clamping element and an upper clamping element which form a workpiece holder.