Abstract: An annular piston is vertically movable and rotatable. A guide groove is provided in an outer peripheral portion of the annular piston, and an engaging ball to be fitted into the guide groove is provided on an inner peripheral wall of a cylinder hole. A transmission mechanism prevents the clamp rod and the annular piston from rotating relatively to each other and permits them to move relatively to each other in a vertical direction. When the clamp rod is moved from a released raised position to a locked lowered position, the annular piston descends while rotating via a rotational groove and the engaging ball, and the annular piston causes the clamp rod to rotate, causing the clamp rod to descend straight down.

Abstract: A housing (3) has an upper end wall (3a) and a lower end wall (3b) which support an upper slide portion (11) and a lower slide portion (12) of a clamp rod (5) vertically movably, respectively. The rod (5) is moved downwards for clamping through a clamp spring (20). The lower slide portion (12) has an outer periphery provided with guide grooves (26), each of which comprises a helical rotary groove (27) and a straight groove (28), peripherally in plural number. Engaging balls (29) which are fitted into the respective guide grooves (26) are rotatably supported by through holes (31) provided in an upper portion of the lower end wall (3b). A sleeve (35) is externally fitted over the engaging balls (29) rotatably around an axis.

Abstract: A toggle lever clamp for use in devices and welding machines in the motor vehicle industry, has a clamping head consists of two shell-shaped parts that combine to form a housing. This arrangement reduces the number of individual parts to a considerable degree and protects sensitive parts on all sides against dust, dirt, and water spray, as well as welding spatter, while permitting ease of movement of the clamps.

Abstract: This invention relates to a fluid operated, positioning apparatus for a workholder (43, 144, 146, 148, 150) for maintaining the locating surfaces (22 and 24) of a workpiece, such as a crosshead (2), in contact with fixed abutments (62 and 68) of a workholder (43, 144, 146, 148, 150) designed to receive workpieces (2) subject to substantial manufacturing tolerances in which forces are imparted to each workpiece (2) during machining operations which tend to move the locating surfaces (22 and 24) of the workpiece (2) away from the fixed abutments (62 and 64) of the workholder. The positioning apparatus (44) includes an L-shaped member (46) in which are mounted a movable pin (70) operating in an advanced position to clamp a crosshead against fixed abutments (62 and 64) of the workholder (43, 144, 146, 148, 150) and a retracted position in which the crossheads (2) may be inserted and removed from the workholder (43, 144, 146, 148, 150).

Abstract: The invention relates to a manual hydraulic operating vise, said vise comprising a stationary jaw with a cylindrical center assembly formed in the body of the stationary jaw. A movable jaw being firmly connected to a main piston in the center assembly by a movable rod. A handwheel used to operate a control valve to seat or unseat on a boost piston in an inner liner inside of the center assembly. Several internal oil passages are provided therein for free oil flow around the main piston when the control valve is unseated, so that the movable jaw can be positioned manually with least resistance, thus greatly reduce the time for positioning. When the control valve is seated further turning handwheel will operate the movable jaw backward hydraulically to clamp the workpiece with a greater force which is the multiplication of force input on the handwheel because hydraulic and mechanical advantage of the structure.

Abstract: A clamp particularly suited for pressure-filled fire hoses has a jaw configuration with three clamping edges with minimum spacing between jaw faces at the clamping edges arranged to effectively close off flow without slipping or twisting, structures for locating one or more hose sizes between the jaws to avoid bunching, and a cast support body and handle arrangement to facilitate operation in either of two positions.