| 摘要 |
A hydraulic overload protector for a mechanical press is provided with a cylindrical operational oil chamber which is formed in a vertical direction. A piston is vertically slidably inserted into a slide. The operational oil chamber is provided with a friction-contacting cylinder. During press operation, the hydraulic pressure of the operational oil chamber fixes the slide to the piston at a predetermined force through the friction-contacting cylinder, so that a pressing force is transmitted from the piston to the slide from an overload. When the slide is overloaded by foreign matter, the piston slides downwards in the slide in resistance to the piston-fixing force, whereby an overload-safe operation is effected.
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