Patent information
IP India · live recordAbstract
A clamping device (10) has a clamp arm (20) pivotably housed inside a body (16), and a locating section (54) for positioning workpieces (W1, W2) is provided on an upper portion of the body (16). The locating section (54) is formed with a slit hole (60) which enables a claw portion (76) of the clamp arm (20) to protrude outside, and is provided inside with a shutter (66) facing the slit hole (60) and being movable. The claw portion (76) of the clamp arm (20) is inserted through a clamp hole (72) of the shutter (66). Then, when the clamp arm (20) moves inside the body (16) in the axial direction and rotates, the shutter (66) moves integrally with the clamp arm (20) in the axial direction to cover the slit hole (60). Thus, the opening portion of the slit hole (60) is suitably covered except that portion occupied by the claw portion (76), so that foreign matter and the like can be prevented from entering the locating section (54) through the slit hole (60).
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[Claim 1] A clamping device (10) comprising: a drive section (14) having a displacement body (28) movable in an axial direction under an action of supplying pressurized fluid; a body (16) connected to the drive section (14) and having a mounting portion (62) on which a workpiece (Wl, W2) is mounted; a clamp arm (20) connected to the displacement body (28) and pivotably supported relative to the body (16); a locating section (54) protruding in the axial direction relative to the mounting portion (62) and being inserted into a positioning hole (h) formed in the workpiece (W); wherein a linear motion of the displacement body (28) outputted by the drive section (14) is converted into a pivotal motion of the clamp arm (20), a slit hole (60) is formed in the locating section (54) and opens along the axial direction, a claw portion (76) of the clamp arm (20) housed inside the locating section (54) protrudes through the slit hole (60), the workpiece (Wl, W2) is clamped between the mounting portion (62) and the claw portion (76), a cover member (66, 120, 130, 140, 150, 160, 170) that faces the slit hole (60) and is movable in the axial direction is provided inside the locating section (54); and the cover member (66, 120, 130, 140, 150, 160, 170) is provided with an opening (72) into which the claw portion (76) is inserted, the opening (72) faces the slit hole (60). [Claim 2] The clamping device according to Claim 1, further comprising: a lock mechanism (22) configured to restrict the pivotal motion of the clamp arm (20). [Claim 3] The clamping device according to Claim 2, wherein: the lock mechanism (22) includes a lock member (88) that is tiltable with respect to the axial direction of the displacement body (28) and restricts a movement of the displacement body (28) when the lock member (88) is tilted. [Claim 4] The clamping device according to Claim 3, wherein: the lock member (88) tilts a predetermined angle urged by a resilient member (104); and
when the pressurized fluid is supplied, the lock member (88) returns from a state where the clock member tilts to a state where the dis-placement body (28) is movable. [Claim 5] The clamping device according to Claim 1, wherein: the cover member (120, 170) is formed in a C-shape in cross section and extends in the axial direction. [Claim 6] The clamping device according to Claim 1, wherein: the cover member (130, 140, 150) is formed to be expansible in the axial direction in which the cover member (130, 140, 150) is moved.