| 摘要 |
A linear guide apparatus has a fall-off prevention and a clamp device built therein. The fall-off prevention and clamp device includes a piston and a top integrally secured to the end of a piston rod. The piston having a piston head is accommodated in an inner bore serving as a fluid pressure cylinder formed vertically in a slider. The top engages a T-shaped groove formed in a guide rail and extending axially over the whole length thereof. A belleville spring normally urges the piston head toward the guide rail, that is, in a non-clamp direction to move the top away from the inner surface of a neck portion of the T-shaped groove. When a fluid pressure is applied to the piston head at the piston rod side against the belleville spring, the piston together with the top moves away from the guide rail, that is, in a clamp direction to bring the top into engagement with the inner surface of the neck portion of the T-shaped groove. As a result, the slider is clamped to the guide rail. The top and the T-shaped groove in which the top is accommodated also serve to prevent the slider from falling off the guide rail.
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