A one-way oil-way driven expansion and retraction movement tool includes a hydraulic driving structure, two long arm rods and two connecting rods, wherein, the hydraulic driving structure has a cylinder barrel, a plunger and a shaft rod, the two arm rods are opposite each other and are opposite the two sides of the shaft rod in the lateral direction. One end of each arm rod is respectively pivoted on the cylinder barrel, and the other end of each arm rod is respectively used for arranging a working piece, so that each working piece can move toward or away from each other to execute corresponding work. The connecting rods are respectively pivoted with each of the arm rods and with the connecting part, so that, through the connecting rods, the shaft rod can pull the arm rods to move away from each other or toward each other.

A replacement structure of a pair of pliers contains: a first grip, a second grip, multiple screw bolts, and a first plier set and a second plier set which are alternatively rotatably connected with the first grip and the second grip. The first grip includes a first connection disc having multiple first orifices, and the second grip includes a second connection disc having multiple second orifices. The first plier set includes a first clamp arm and a second clamp arm, the first clamp arm has multiple third orifices, and the second clamp arm has multiple fourth orifices. Alternatively, when the second plier set is rotatably connected with the first grip and the second griping, the second plier set includes a third clamp arm and a fourth clamp arm, the third clamp arm has multiple fifth orifices, and the fourth clamp arm has multiple sixth orifices.

Multifunctional pliers include a right lever and a left lever, with an upper working portion which includes right and left tip ends at one end respectively, and a handle portion which includes right and left handles at the other end respectively, the working portion and handle portion connected at the pivot axis, wherein the levers and are of substantially equal length and are pivotally hinged together about the pivot axis which is spaced a preselected distance T from the right and left tip ends, and a preselected distance H from the left and right handle ends. The working portion includes a utility portion extending longitudinally from the pivot axis to a tip web, the utility portion configured for cutting and gripping and includes a cutting portion and gripping portion respectively. The working portion includes a needle nose portion which extends longitudinally from the tip web to the right and left tips. The multifunctional pliers claimed in claim 1 wherein the needle nose portion includes a pry surface which when viewed from the side, extends laterally away from an outer face plane, the pry surface is inclined at an angle theta relative to the lateral direction wherein angle theta is between 2 to 30.

A retaining ring plier comprises a drive system. a first tip, a second tip, and a linkage system. The drive system defines a drive axis and comprises a base member defining a base drive opening, a carrier member defining a carrier drive opening, and a drive rod defining first and second surface portions, where the drive rod is arranged such that the first surface portion engages the base drive opening and the second surface portion engages the carrier drive opening. The linkage system comprises first drive link member extending between the carrier member and the first tip, a second drive link member extending between the carrier member and the second tip, at least one first guide link member extending between the base member and the first tip. The at least one second guide link member extends between the base member and the second tip.

A plug for retaining a filter screen in a fluid port of a servovalve, comprises an annular body, the annular body comprising: opposed first and second axial end surfaces, a radially inner surface extending between the first and second axial end surfaces, a radially outer surface extending between the first and second axial end surfaces and at least one recess formed in the radially inner surface for receiving a tool for removing the plug from the port. A tool for removing the plug comprises a pair of handles pivotally mounted to one another about a pivot, each handle having a plug gripping portion extending therefrom beyond the pivot, each plug gripping portion comprising an outwardly projecting tooth for engaging in the recess of the plug when the plug gripping portions are moved apart by operation of the handles.

A tool for use in preloading a bearing includes a plurality of arms pivotable relative to each other and a pin extending from each arm of a plurality of arms. The pin is configured to engage an opening of a plurality of openings in a retaining ring. A resilient member biases the plurality of arms away from each other. A first arm of the plurality of arms includes a cavity. A second arm of the plurality of arms is received in the cavity such that an extending portion of the second arm extends outside the cavity and the second arm is moveable in the cavity.

A dual compression and distraction tool for surgical operations, the tool including a first arm having a first pivot axis, a second pivot axis, a first lever, and a first dual purpose jaw, a second arm having a third pivot axis, a fourth pivot axis, a second lever, and a second dual purpose jaw, wherein, in a first position, the first arm is pivotably connected to the second arm such that the first pivot axis is merged with the third pivot axis, to form an distraction tool, and wherein, in a second position, the first arm is pivotably connected to the second arm such that the second pivot axis is merged with the fourth pivot axis, to form a compression tool.

A C-clip includes a C-shaped clip body and two peripherally open holes. The clip body can be opened and closed elastically. The peripherally open holes are provided on two lateral sides of the clip body respectively and are adjacent to or located at the two ends of the clip body respectively. The peripherally open holes are provided in the clip body and each have a communication opening and a closed end. A wall between the communication opening and the closed end of each peripherally open hole forms a stop edge for preventing a tip of a retaining ring plier from moving out of the peripherally open hole. The outer diameter of the clip body can be changed by applying forces to the clip body via the peripherally open holes respectively. As the clip body does not have any particularly protruding portion, the C-clip can be used in various situations.

The invention relates to a device (18) for bending a split pin (4) for securing the position of a workpiece (2), in particular for securing a castellated nut against rotation. The device has a tool body (22) and a holding component (20) for holding the split pin (4) during a bending procedure. The holding component (20) is mounted so as to be rotatable on the tool body (22). The device (18) has a bending element (26) that is disposed on the tool body (22) such that an end of a split pin (4) that is held on the holding component (20) is capable of being bent back by a relative rotation on the bending element (26), in particular in a manner so as to be flush with the shape of the workpiece (2), between the holding component (20) and the tool body (22).

A pair of double-headed retaining ring pliers, including handles, a left arm, and a right arm. Middle parts of the left arm and the right arm are hingedly connected by a hinge axle. The handles are divided into a left handle and a right handle. The handles are flipped to enable the retaining ring pliers to have two working states: One is used for installing an outer retaining ring, and the other is used for installing an inner retaining ring. In addition, the left arm and the right arm can be returned by a return spring.