| 摘要 |
An overload detecting and alarm device for hydraulic jack comprises an electronic alarm device and a pressure sensitive switch member connected with the electronic alarm device. The pressure sensitive switch member is inserted into the body of the hydraulic jack and is communicated with the ram cylinder through a duct. This switch member comprises a pressure actuated piston which is normally biased in one direction and a spring plate positioned at another direction. The piston and spring plate act as electric contacts in the switch member and will come into contact each other when an overload fluid pressure is exerted on the piston, thereby inducing the electronic alarm device to produce a warning signal.
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