A two-station self-centering vise to hold a pair of work pieces is described. The pieces are held in place against a centered fixed jaw, being clamped against the centered fixed jaw by a pair of movable jaws located on either side of the centered jaw and that simultaneously move toward or away from the centered jaw on actuation of a lead screw. The vise may be converted to a single station vise by removable of the fixed center jaw. A spring loaded, adjustable, friction pad attached to the base of one of the two movable jaws enables temporary clamping of a first work piece while the second workpiece is being installed and once both workpieces are in place the lead screw is turned further to securely and accurately hold the workpieces in between the movable jaws and the fixed central jaw.

A self-centering vise structure includes a vise body, a guide screw, a positioning unit, a first movable jaw unit, and a second movable jaw unit. The vise body is provided with a guide way. The positioning unit is provided with two fixed portions each provided with an elongate slot. The positioning unit is provided with two locking screws each extending through the elongate slot of each of the two fixed portions and is screwed into the guide way of the vise body. The elongate slot of each of the two fixed portions is moved relative to each of the two locking screws, and the positioning unit is moved relative to the vise body, to micro-adjust a central location of the self-centering vise structure.

A modular side-by-side vise structure including a base, a fixture block group located on the base, and a side clamping piece group; the side clamping piece has an upper part and a lower part, and a bolt is screwed in the upper part to prop the lower part, so that the stopper and movable fixture block cling to the base tightly; or the side grooves on both sides of the stopper and movable fixture block are provided with bolt holes, and the inner wall of side clamping piece is provided with a punch hole, the bolt is screwed in the bolt hole through the punch hole, so that the stopper and movable fixture block cling to the base tightly. Therefore, it is unnecessary to hold up the side clamping piece with a hand while tightening or loosening the bolt, favorable for the technician to implement quick assembly or disassembly.

A vice including two clamping gaps (10, 20). A first body (1) includes a first jaw (11) and a second body (2) includes a second jaw (21), between which is formed a first clamping gap (10). A third body (3) is connected by an axis (9) to the first body (1), wherein the third body (3) includes a third jaw (31), which is adapted to rotate around the axis (9). The first body (1) includes a fourth jaw (41) opposite the third jaw (31), wherein between the third jaw (31) and the fourth jaw (41) is formed a second clamping gap (20).

An improved floating jaw assembly to a machinist vise assembly capable of holding a plurality of individual workpieces, the vise assembly generally including a base with a way or ways, a fixed jaw mounted on the ways, at least one movable jaw slidably mounted on the ways to move toward and away from the fixed jaw on a longitudinal axis in such a manner that at least one workpiece can be securely held between the fixed jaw and the at least one movable jaw, and a mechanism for moving the movable jaw toward and away from the fixed jaw to clamp and unclamp workpieces. The floating jaw assembly includes at least one floating jaw plate attached to the vise assembly with means for adjustable movement of the floating jaw plate(s) along the longitudinal axis of the vise assembly and for articulated movement of the floating jaw plate(s) in a plane substantially parallel to the base of the vise assembly and about an axis perpendicular to the longitudinal axis of the vise assembly so that the floating jaw plates can, in cooperation with adjoining jaws or plates, adjust to and securely hold workpieces. In addition, the floating jaw assembly includes a means of forcing the at least one floating jaw plate downward and securely against the ways of the vise assembly.

A vice including two clamping gaps (10, 20). A first body (1) includes a first jaw (11) and a second body (2) includes a second jaw (21), between which is formed a first clamping gap (10). A third body (3) is connected by an axis (9) to the first body (1), wherein the third body (3) includes a third jaw (31), which is adapted to rotate around the axis (9). The first body (1) includes a fourth jaw (41) opposite the third jaw (31), wherein between the third jaw (31) and the fourth jaw (41) is formed a second clamping gap (20).

A straight edge bar clamp spreader comprises a straight edge bar, an inner channel portion, parallel channel portions, and two-way bosses or divots, a clamp, and a clamp-spreader. The inner channel portion is provided along an elongated central region of the bottom surface of the straight edge bar with a constant cross-section. The parallel channel portions are provided along two elongated parallel regions of the top surface of the straight edge bar. The two-way bosses or divots are provided across and on an inner surface of the inner channel portion of the bottom surface and an outer surface of the top surface and configured to define the predetermined stopping positions for two-way movements along the bottom surface or the top surface. The clamp is installed in the inner channel portion of the bottom surface. The clamp-spreader is installed in the pair of parallel channel portions of the top surface.

In a clamping device (1), in particular vice, the clamping device comprising: a housing (2) which is U-shaped in cross-section and in which one or two guideways (8) extending in a linear direction are incorporated, at least one base jaw (11) which is mounted in the guideway (8) and in which an internal thread (12) is provided, and a drive spindle (9) which is rotatably mounted in the respective housing (2), is arranged parallel to the guideway (8) and is driveably coupled to the respective base jaw (11),
the threads (10) worked into the drive spindle (9), through which the torques from the crank are transmitted for the linear displacement of the base jaws (11), should be permanently encapsulated in a watertight and airtight manner irrespective of the position of the base jaws (11) or the drive spindle (9), and on the other hand the adjustment travel (s) of the base jaws (11) or clamping jaws (13) should be as large as possible in order to clamp workpieces with configurations that can be completely different without the need for time-consuming and complicated conversion measures.

This is achieved in that a right-hand thread and a left-hand thread (10) are worked onto the drive spindle (9) in regions, in that the respective thread (10) of the drive spindle (9) is enclosed or encapsulated by a cover sleeve (21), in that the cover sleeve (21) has a right-hand thread and a left-hand internal thread (22), which are driveably coupled to the respective thread (10) of the drive spindle (9), in that a right-hand and a left-hand external thread (23), which is in engagement with the respective internal thread (12) of the base jaw (11), is worked on to the cover sleeve (21).

A modular side-by-side vise structure comprises a base, a fixture block group located on the base, and a side clamping piece group; the side clamping piece has an upper part and a lower part, and a bolt is screwed in the upper part to prop the lower part, so that the stopper and movable fixture block cling to the base tightly; or the side grooves on both sides of the stopper and movable fixture block are provided with bolt holes, and the inner wall of side clamping piece is provided with a punch hole, the bolt is screwed in the bolt hole through the punch hole, so that the stopper and movable fixture block cling to the base tightly. Therefore, it is unnecessary to hold up the side clamping piece with a hand while tightening or loosening the bolt, favorable for the technician to implement quick assembly or disassembly.

A vise system is provided to retain a workpiece. In an embodiment, the vise system comprises one or more center vise and one or more end vises. The center vises and end vises are clamped to a table or workbench. The center vise is provided with a front jaw and a rear jaw to retain the center of the work. The end vises are provided with workpiece clamps to retain the ends of the workpiece.