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 an 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 clamp pallet (2) as a reference member is fixed to a table (1) of a machining center. A tapered positioning hole (12) is opened in a lower surface of a work pallet (3) as a movable member. An annular central pillar (21) is projected upward from the clamp pallet (2), and an intermediate member (22) is arranged between the central pillar (21) and the positioning hole (12). The intermediate member (22) is composed of a shuttle member (23), which is diametrically expandable and contractible and supported on the central pillar (21) vertically movably, and a tapered cylinder (26), which is attached to an outer periphery of the shuttle member (23) and makes a tapering engagement with the positioning hole (12). The shuttle member (23) is urged upward by means of an elastic member (24).

Abstract: A plug member (12) is projected upward from a first block (1) so as to be inserted into a positioning hole (5) of a second block (2). An inclined outer surface (13) getting closer to an axis upward is provided on the plug member (12). A sleeve member (15) which is allowed to deform in both a diametrically expanding direction and a diametrically contracting direction is arranged outside the inclined outer surface (13). The sleeve member (15) is provided with a straight outer surface (16) which is allowed to come into close contact with the positioning hole (5) and an inclined inner surface (17) facing the inclined outer surface (13). A drive member (21) is inserted into the plug member (12) axially movably and connected to the sleeve member (15). The sleeve member (15) is moved vertically by a drive device (D).

Abstract: A plug member (12) inserted into a positioning hole (5) formed in a second block (2) is projected from a first block. Two slide portions (61, 61) opposed to each other across the plug member (12) are arranged around the plug member (12) movably in a first radial direction (D1) substantially orthogonal to the opposed direction. An annular pressing member (15) which is allowed to diametrically expand and diametrically contract is arranged around an outer periphery of the slide portion (61, 61). The slide portions (61, 61) diametrically expand the pressing member (15) in a second radial direction (D2) which is the opposed direction by a drive device to press the pressing member (15) against an inner peripheral surface of the positioning hole (5), by which the slide portions (61, 61) are moved in the first radial direction (D1) with respect to the plug member (12).

Abstract: A plug portion (27) is projected from a first block (1) so as to be inserted into a insertion hole (5) opened in a second block (2). A support surface (9a) is formed on the first block (1) so as to be brought into contact with a supported surface (2a) formed on the second block (2). In the support surface (9a) is opened a fluid flow hole (59). A gap supporting member (K) acting force upon the second block (2) in such a direction as to separate the second block (2) from the first block (1) so as to form a gap (G1) between the supported surface (2a) and the support surface (9a) is provided on the first block (1). A pull member (21) eliminates the gap (G1) by making the second block (2) approach the first block (1) against the force of the gap supporting member (K) in such a condition that an outer peripheral surface of the plug portion (27) is in close contact with an inner peripheral surface of the insertion hole (5) to bring the supported surface (2a) into contact with the support surface (9a).

Abstract: A housing (15) fixed to a reference block (1) is provided with a guide hole (20) into which a plug portion (3) of a movable member (2) is allowed to be inserted. Inside this guide hole (20) is arranged an outer sleeve (21) vertically movably, and this outer sleeve (21) is advanced upward by a predetermined advancing stroke by a coned disc spring (25). An inner sleeve (31) which is allowed to fit outside the plug portion (3) is wedge-engaged with the outer sleeve (21) from above, and this inner sleeve (31) is adapted to be diametrically expandable and diametrically contractible. The inner sleeve (31) is moved vertically by an output member (36).

Abstract: A drive piston (11) is inserted into a housing (8) vertically movably. A pull rod (18) is projected further upward than a support surface (S) of the housing (8), and the pull rod (18) is connected to the drive piston (11) radially movably. An inner engaging member (38) is supported on an outer periphery of the pull rod (18) vertically movably. The inner engaging member (38) is adapted to be radially movable with respect to the housing (8), and the inner engaging member (38) is advanced upward by a coned disc spring (41). A plurality of outer engaging members (39) to be inserted into an engaging hole (3) of a work pallet (2) are arranged on an outer periphery of the inner engaging member (38). The plurality of outer engaging members (39) are wedge-engaged with the inner engaging member (38) from the upper side. To these outer engaging members (39) is joined an upper portion of the pull rod (18). The plurality of outer engaging members (39) are urged radially inward by a ring-shaped flat spring (44).

Abstract: A clamp pallet (2) as a reference member is fixed to a table (1) of a machining center. A tapered positioning hole (12) is opened in a lower surface of a work pallet (3) as a movable member. An annular central pillar (21) is projected upward from the clamp pallet (2), and an intermediate member (22) is arranged between the central pillar (21) and the positioning hole (12). The intermediate member (22) is composed of a shuttle member (23), which is diametrically expandable and contractible and supported on the central pillar (21) vertically movably, and a tapered cylinder (26), which is attached to an outer periphery of the shuttle member (23) and makes a tapering engagement with the positioning hole (12). The shuttle member (23) is urged upward by means of an elastic member (24).

Abstract: Into a housing (3) is hermetically inserted an annular piston (5), and into the annular piston (5) is hermetically inserted an output rod (8). A spring (14) located below the piston (5) moves the piston (5) upward for locking, pressurized oil in a release chamber (12) formed above the piston (5) moves the piston (5) downward for releasing. On an upper surface of the piston (5) is provided a pressing surface (38), on an inner periphery of a peripheral wall of the release chamber (12) is provided a first tapered surface (41), which narrows upward, and on an outer periphery of the output rod (8) is provided a second tapered surface (52), which narrows downward. Between the pressing surface (38), the first tapered surface (41) and the second tapered surface (52) are inserted a plurality of balls (55) circumferentially at intervals. Thereby, when the spring (14) moves the piston (5) upward for locking, a moving stroke of the output rod (8) is larger than that of the piston (5).

Abstract: A housing (6) is provided in a reference block (1). An annular plug (9), which is to be inserted into a positioning hole (3) of a work pallet (2), is projected upward from the housing (6). An output member (13) is inserted into a guide hole (10) of the housing (6) vertically movably. An upper end of the output member (13) is inserted into the annular plug (9), and a plurality of pressing members (56) are supported on a peripheral wall (9a) of the annular plug (9) radially movably. An annular aligning space (31) is formed between a guided portion (21) of the output member (13) and the guide hole (10). A shuttle member (41), which is diametrically expandable and contractible, is inserted into the aligning space (31). The shuttle member (41) is urged upward by a spring (51).

Abstract: A central pillar (20) is projected upward from a reference block (1), and an inner sleeve (21) is fitted to an outer periphery of the central pillar (20) vertically movably. The inner sleeve (21) is pushed upward by a coned disc spring (25). An outer sleeve (31) to be inserted into a socket hole (3) of a movable block (2) makes a tapering engagement with the inner sleeve (21) from above. The inner sleeve (21) and the outer sleeve (31) are adapted to be diametrically expandable and contractible. An output member (36) is inserted into the central pillar (20), and an upper portion of the output member (36) is connected to the outer sleeve (31). A driving mechanism (D) in the reference block (1) moves the outer sleeve (31) downward for locking via the output member (36).

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 first piston (22) of a first locking cylinder (20) descends when a pressure of compressed air in an actuation chamber (23) has exceeded a pressure for locking commencement (P1) and ascends by a first spring (24) when the pressure of the compressed air has decreased to a pressure for releasing commencement (P2). A second advancing and retreating cylinder (32) comprises an inlet chamber (41) and an outlet chamber (45) formed below and above a second piston (35), respectively, and a second spring (46). The actuation chamber (23) communicates with the outside air through the outlet chamber (45). A restricting passage (37) is provided in a route between the actuation chamber (23) and the outside air. The actuation chamber (23) communicates with one of the inlet chamber (41) and the outlet chamber (45) through a communication hole (62).

Abstract: A work pallet (3) is opened to provide a circular positioning hole (5). A plug member (12) is inserted into the positioning hole (5) and projects from a base plate (2). The plug member (12) is provided with a slant outer surface (13) which narrows upwards. An intermediate member (15) in the shape of a thin-walled cylinder is arranged outside the plug member (12). The intermediate member (15) is provided with a straight outer surface (16) which is fitted into the positioning hole (5) and with a slant inner surface (17) which opposes to the slant outer surface (13) of the plug member (12). A coned disk spring (34) moves down the intermediate member (15) for locking through a pull member (21).

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: 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 housing (4) has a cylinder bore (10) into which an annular hydraulic piston (11) is inserted vertically movably. The piston (11) has a tubular bore (11a) into which a driven rod (6) is inserted. The driven rod (6) is provided with an input portion (6a), around which a plurality of transmission members (15) are arranged peripherally side by side. The transmission members (15) swing to a disengaging position (Y) through a push member (30) by a lowering spring (31). When clamping, the piston (11) is driven upwards. Then, first, a slant cam (27) swings the transmission members (15) to an engageable position (X), thereby enabling engaging portions (17) to face the input portion (6a). Next, the piston (11) upwardly drives the input portion (6a) through the engaging portions (17).

Abstract: A work pallet (3) is opened to provide a circular positioning hole (5). A plug member (12) is inserted into the positioning hole (5) and projects from a base plate (2). The plug member (12) is provided with a slant outer surface (13) which narrows upwards. An intermediate member (15) in the shape of a thin-walled cylinder is arranged outside the plug member (12). The intermediate member (15) is provided with a straight outer surface (16) which is fitted into the positioning hole (5) and with a slant inner surface (17) which opposes to the slant outer surface (13) of the plug member (12). A coned disk spring (34) moves down the intermediate member (15) for locking through a pull member (21).