Abstract: A supporting face (1a) is provided on a base plate (1), a face (2a) to be supported is provided on a work pallet (2), and an engagement hole (3) is opened in the face (2a) to be supported. A core column (11) is projected upward from a housing (9) fixed to the base plate (1). An elastic sleeve (12) that fits in the engagement hole (3) is supported in a space at the outer periphery of the core column (11), on the upper face of the housing (9). Wedge spaces (W) narrowing downward are circumferentially arranged at substantially equal intervals between the core column (11) and the elastic sleeve (12). Wedge members (15) are vertically movably inserted in each of the wedge spaces (W). Input portions (20) of the wedge members (15) are connected to an output portion (44) of an upper rod (43) of a piston (33).

Abstract: A housing (3) has an upper end wall (3a) which supports an upper slide portion (11) of a clamp rod (5) vertically movably. The housing (3) has a lower end wall (3b), a support cylinder (13) of which supports a lower slide portion (12) of the rod (5) vertically movably. The rod (5) is provided with an input portion (14) between the upper slide portion (11) and the lower slide portion (12). A clamp spring (20) connected to the input portion (14) drives the rod (5) downwards for clamping. The lower slide portion (12) has an outer periphery provided with a helical rotary groove (27) and a straight groove (28) which is in upward continuity with the rotary groove (27). A ball (29) engages with the rotary groove (27) and the straight groove (28). The ball (29) is supported by an inner wall (13a) of the support cylinder (13).

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 clamp rod (5) is inserted into a housing (3) rotatably around an axis and movably downwards for clamping. The clamp rod (5) has an outer peripheral portion formed with three guide grooves (26) which are arranged peripherally at substantially the same spacing. An engaging ball (29) which is fitted into every guide groove (26) is supported by a lower end wall (3b) of the housing (3). Each of the guide grooves (26) comprises a rotary groove (27) and a straight groove (28) which is in upward continuity with the rotary groove (27). The rotary grooves (27) as well as the straight grooves (28) are arranged in parallel with one another. A partition wall between the adjacent guide grooves (26), (26) has a minimum thickness (T) set to a value smaller than a diameter (D) of the engaging ball (29).

Abstract: Two positioning devices (4, 5) are horizontally spaced apart from two clamping devices (6, 6) at a predetermined interval. Each of the positioning devices (4, 5) includes a positioning hole (23) provided by opening a work pallet (2), a plug portion (27) projecting from a clamp pallet (1), and an intermediate member (30) vertically movably supported by the plug portion (27). The intermediate member (30) is urged upwards by a coned disk spring (31) and has a tapered surface (33) which makes a tapering engagement with the positioning hole (23). The clamping device (6) fixes the work pallet (2) to the clamp pallet (1).

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 work pallet (3) has an under surface opened to provide a positioning hole (12). The positioning hole (12) has an upper wall which supports a pull rod (13) diametrically movably. A clamp pallet (2) projects an annular plug portion (21), onto which a shuttle member (23) is externally fitted. The shuttle member (23) makes a tapering engagement with the positioning hole (12). The plug portion (21) has a cylindrical hole (21a), into which a transmission sleeve (31) is inserted. The transmission sleeve (31) supports an engaging ball (34), which engages with an engaged portion (13b) of the pull rod (13). Defined between the cylindrical hole (21a) and an outer peripheral surface (31b) of the transmission sleeve (31) is a flow passage (43) through which cleaning compressed air passes.

Abstract: A clamp rod (5) is inserted into a housing (3) rotatably around an axis and movably downwards for clamping. The clamp rod (5) has an outer peripheral portion formed with three guide grooves (26) which are arranged peripherally at substantially the same spacing. An engaging ball (29) which is fitted into every guide groove (26) is supported by a lower end wall (3b) of the housing (3). Each of the guide grooves (26) comprises a rotary groove (27) and a straight groove (28) which is in upward continuity with the rotary groove (27). The rotary grooves (27) as well as the straight grooves (28) are arranged in parallel with one another. A partition wall between the adjacent guide grooves (26), (26) has a minimum thickness (T) set to a value smaller than a diameter (D) of the engaging ball (29).

Abstract: A housing (3) has an upper end wall (3a) which supports an upper slide portion (11) of a clamp rod (5) vertically movably. The housing (3) has a lower end wall (3b), a support cylinder (13) of which supports a lower slide portion (12) of the rod (5) vertically movably. The rod (5) is provided with an input portion (14) between the upper slide portion (11) and the lower slide portion (12). A clamp spring (20) connected to the input portion (14) drives the rod (5) downwards for clamping. The lower slide portion (12) has an outer periphery provided with a helical rotary groove (27) and a straight groove (28) which is in upward continuity with the rotary groove (27). A ball (29) engages with the rotary groove (27) and the straight groove (28). The ball (29) is supported by an inner wall (13a) of the support cylinder (13).

Abstract: Two positioning devices (4, 5) are horizontally spaced apart from two clamping devices (6, 6) at a predetermined interval. Each of the positioning devices (4, 5) includes a positioning hole (23) provided by opening a work pallet (2), a plug portion (27) projecting from a clamp pallet (1), and an intermediate member (30) vertically movably supported by the plug portion (27). The intermediate member (30) is urged upwards by a coned disk spring (31) and has a tapered surface (33) which makes a tapering engagement with the positioning hole (23). The clamping device (6) fixes the work pallet (2) to the clamp pallet (1).

Abstract: A work pallet (3) has an under surface opened to provide a positioning hole (12). The positioning hole (12) has an upper wall which supports a pull rod (13) diametrically movably. A clamp pallet (2) projects an annular plug portion (21), onto which a shuttle member (23) is externally fitted. The shuttle member (23) makes a tapering engagement with the positioning hole (12). The plug portion (21) has a cylindrical hole (21a), into which a transmission sleeve (31) is inserted. The transmission sleeve (31) supports an engaging ball (34), which engages with an engaged portion (13b) of the pull rod (13). Defined between the cylindrical hole (21a) and an outer peripheral surface (31b) of the transmission sleeve (31) is a flow passage (43) through which cleaning compressed air passes.