A sprinkler clamp assembly for servicing sprinkler heads includes a clamp that has a pair of curved jaws. Each of the curved jaws curves toward each other such that the pair of curved jaws defines a circle when the clamp is biased into a closed position. In this way the curved jaws can encircle a stem of a sprinkler head. Each of the curved jaws rests against a housing of the sprinkler head when the curved jaws are positioned around the stem of the sprinkler head. A head of the sprinkler head abuts each of the curved jaws when the stem retracts into the housing to retain the head in an exposed position for servicing.

A clamping plate for receiving at least one workpiece clamping device or a workpiece, the clamping plate including: a support surface for the at least one workpiece clamping device or the workpiece, the support surface is penetrated by a plurality of openings for receiving clamping bolts of the at least one workpiece clamping device, clamping slides being arranged in the clamping plate, the clamping slides each project with one end into one of the plurality of openings in a clamping position and are located outside the one of the plurality of openings in a release position, a clamping wedge, which is movably arranged in the clamping plate and is operatively connected to the clamping slides via at least one spring means.

A clamping plate for receiving at least one workpiece clamping device or a workpiece, the clamping plate including: a support surface for the at least one workpiece clamping device or the workpiece, the support surface is penetrated by a plurality of openings for receiving clamping bolts of the at least one workpiece clamping device, clamping slides being arranged in the clamping plate, the clamping slides each project with one end into one of the plurality of openings in a clamping position and are located outside the one of the plurality of openings in a release position, a clamping wedge, which is movably arranged in the clamping plate and is operatively connected to the clamping slides via at least one spring means.

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 power clamp includes a body. A piston assembly is coupled with the body. The piston assembly includes an actuation mechanism and a movable piston rod. A linkage is housed in the body. The linkage is movably coupled with the piston rod. A plunger is movably coupled with the linkage. A clamp hook is coupled with the plunger for clamping a workpiece. The linkage moves the clamp hook between a release and clamping position.

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.

Aspects of the disclosure relate to a sliding clamp including a first arm with a first jaw attached to the first arm, and a second arm with a second jaw attached thereto. The first jaw includes at least one first clamping ball freely rotatable relative to the first arm, and the second jaw includes at least one second clamping ball freely rotatable relative to the second arm. The second arm is configured to move relative to the first arm to adjust a jaw opening between the at least one second clamping ball of the second jaw and the at least one first clamping ball of the first jaw. The sliding clamp is configured to constrain a workpiece to a clamping plane while permitting translation of the workpiece within the clamping plane.

Aspects of the disclosure relate to a sliding clamp including a first arm with a first jaw attached to the first arm, and a second arm with a second jaw attached thereto. The first jaw includes at least one first clamping ball freely rotatable relative to the first arm, and the second jaw includes at least one second clamping ball freely rotatable relative to the second arm. The second arm is configured to move relative to the first arm to adjust a jaw opening between the at least one second clamping ball of the second jaw and the at least one first clamping ball of the first jaw. The sliding clamp is configured to constrain a workpiece to a clamping plane while permitting translation of the workpiece within the clamping plane.

The apparatus (1) for clamping workpieces on machine tools comprises: a basic frame (2) fixable to a machine tool (M) for machining a workpiece (P); a clamping unit (3); a hydraulic actuator (22, 23) comprising a first chamber (26) which can be supplied with a first pressurized hydraulic fluid and is connectable to a first sensing device (27) for sensing the pressure of the first hydraulic fluid; a sensing channel (15) which can be supplied with pressurized air and which is connectable to a sensing sensor (16) for sensing the pressure of the air;
wherein the first sensing device (27) and the sensing sensor (16) are connectable to a control system adapted to authorize the machining of the workpiece (P) when the pressure of the first hydraulic fluid and the pressure of the air are simultaneously higher than their respective threshold values.

An output part is provided to the left end of a clamp arm that is supported by a housing so as to be slidable in the vertical direction. At the left end of the housing, a first hole for spring fitting opens obliquely upward towards the output part. A through hole that links the upper surface and the lower surface of the clamp arm is disposed obliquely upward at a left-leaning part of the clamp arm. A second hole for spring fitting and a female screw hole are formed, in that order, upwards in the through hole. A return spring that is installed through the first hole and the second hole impels the output part upwards. A push bolt that is screwed into the female screw hole rom above compresses the return spring.