A work holding device includes a first jaw piece having an elongated first connection member for connecting the work holding device to a support. The first connection member defines a first passage. A second jaw piece has an elongated second connection member positionable within the first passage. The second connection member defines a second passage in communication with the first passage. A spindle assembly movably couples the second jaw piece to the first jaw piece. The spindle assembly is configured to move the second jaw piece with respect to the first jaw piece to create a clamping pressure when an object is placed between the first jaw piece and the second jaw piece.

A positioning device capable of increasing the amount of diametrical expansion of an engagement member to be engaged in a cylindrical hole in a workpiece, and capable of performing positioning while not exerting any force on the workpiece in the downward direction positions a cylindrical hole (Ha) in a workpiece (W) in a first direction while permitting shifting thereof in a second direction, the device comprising: the insertion shaft member; a hydraulic cylinder for driving the insertion shaft member; a pair of engagement members; a taper engagement mechanism for shifting the engagement members to increase their diameter; and a movement permitting holding mechanism that, along with supporting the engagement members, so that they cannot shift in the first direction but are capable of shifting in the second direction.

An apparatus for clamping a work piece is provided. The apparatus includes a base plate to support the work piece; at least one clamp body fixed to the base plate; at least one fastener fixing the at least one clamp body to the base plate; and a protruding piece having at least a portion thereof inserted into the clamp body and an end thereof extending from a lateral face of the clamp body, the protruding piece including a hollow point tip at the opposite end, where outer and inner lateral surfaces of the hollow point tip join to define a circular sharp edge at the opposite end of the protruding piece.

A pen vice includes a base, an operating device mounted onto the base and multiple studs vertically secured on the base, wherein the studs correspond to two opposite sides of the base. Two parallel link mechanisms respectively mounted onto the studs that correspond to the two opposite sides of the base. A first sliding jaw and a second sliding jaw is disposed between the two parallel link mechanisms. The two parallel link mechanisms drive the first sliding jaw and the second sliding jaw to clamp or release a pen shank.

A pen vice includes a base, an operating device mounted onto the base and multiple studs vertically secured on the base, wherein the studs correspond to two opposite sides of the base. Two parallel link mechanisms respectively mounted onto the studs that correspond to the two opposite sides of the base. A first sliding jaw and a second sliding jaw is disposed between the two parallel link mechanisms. The two parallel link mechanisms drive the first sliding jaw and the second sliding jaw to clamp or release a pen shank.

The present invention provides an improved release mechanism for clamping tools where problems of thread slipping due to worn out thread can be reduced by the structure of a plunger with a small diameter section and the engagement of the thread shaft is made more secure by the cam action on account of the shape of the plunger. A protrusion extends from a push button on a top portion of the half-threaded nut. Threads are formed on an upper portion of the hole for engaging the threaded shaft. The middle portion of the plunger is made to have a section of small diameter allowing the protrusion to be pushed downward in a normal position and allowing the protrusion to rely on the resilient power of the helical spring to push it upward into the small diameter section.

A tool includes an actuator assembly, a rod, a first nut, and a second nut. The actuator assembly includes a cylinder, a ram, and a bore extending through the cylinder and the ram. The cylinder includes an internal chamber supporting the ram, a first end, a second end, and a reaction surface positioned proximate the first end. The ram is movable relative to the cylinder and positioned adjacent the second end of the cylinder. The rod extends through the bore of the actuator assembly. The first nut is selectively coupled to one of a first end of the rod and a second end of the rod, and defines a first dimension larger than the bore width of the bit block. The second nut is selectively coupled to the other of the first end of the rod and the second end of the rod, and defines a second dimension less than the bore width.

Disclosed is an adjustable roller carrier, comprising a roller carrier base (1), rollers (2) and a motor speed reducing driver, wherein both ends of the roller carrier base are each articulated with a roller bearing (3) and a roller carrier hydraulic jack (5), with the roller carrier hydraulic jack (5) being articulated with the roller bearing (3) and the roller (2) being mounted on the roller bearing. The roller carrier hydraulic jack and a hydraulic pump station thereof, and an electromagnetic valve are all placed inside a hollow roller carrier support so that not only the height and the center-to-center distance of the rollers are adjustable, but also the adjustable roller carrier has the advantages of being integrally compact in structure, and small in terms of occupied space. The adjustable roller carrier enables the steel pipe to rotate in a narrow space, can be fast lifted, and transported by railway. The adjustable roller carrier is convenient to operate and has high safety.

The invention disclosed herein generally relates to an improved clamp assembly for attaching two or more objects, such as furniture, tables, desks, dividers or other panel elements together of variable thicknesses. The elements of the clamp assembly invention generally include a clamp body with a clamp stop and clamp spine, a cross-dowel, an actuating screw and clamp lever. The clamp assembly imparts a compressive clamping force by utilizing a fulcrum-lever arrangement whereby the clamp lever is moved in an arcuate trajectory by rotating the actuating screw in the desired direction as the clamp lever pivots about a fulcrum point. This allows the user to easily place and connect various objects, such as tables, desks, courtesy and privacy panels and another desired object that the user desires to secure in a desired arrangement by imparting a compressive force to the panel element that is to be connected to another panel element.

Provided is a device that prevents a workpiece from sticking to a clamp part and moving with the clamp part to a position deviating from a predetermined position. The device for holding the workpiece includes: a seat on which the workpiece is seated; a clamper that is movable with respect to the seat; a clamp part that is movably supported by the clamper and is configured to hold the workpiece at a clamp position with respect to the clamper in such a manner that the clamp part is pressed against the workpiece by an operation of the clamper so that the workpiece is held between the clamp part and the seat; and a biasing part that is configured to bias the clamp part to move the clamp part from the clamp position when the clamp part is at the clamp position.