[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.