Abstract: A locomotion platform is composed of a platform main body, a waist holding device, a signal fetching circuit, and a monitoring system. The platform main body consists of a platform structure body, a perforated platform face plate, position sensors, and balls located over the position sensors. The waist holding device consists of a waist ring for catching the waist of a user, and a fastening member for fastening the waist holding device with the platform structure body. The signal fetching circuit is intended to fetch the signals generated by the position sensors. The monitoring system is intended to receive the output signals of the signal fetching circuit and is provided with a software for computing the displacement generated by the strolling of the user on the platform main body. The results of computation are exhibited on a monitor.

Abstract: An alarm device is designed to warn of danger of hitting high voltage overhead power lines by a crane in motion. The alarm device is composed of an electric-field sensor for detecting the alternating electric field of the overhead power lines and for outputting an alternating current, which is then converted or amplified by an amplifier connected with the electric-field sensor. An alternating voltage is outputted by the amplifier such that the alternating voltage is rectified and filtered by a rectifier/filter circuit connected with the amplifier. A direct current voltage output is brought about by the rectifier/filter circuit. A starter is disposed between the rectifier/filter circuit and a wireless transmitter capable of being activated by the starter to transmit a wireless signal at such time when the value of the direct current voltage exceeds a preset value. The alarm device is further composed of a wireless receiver/alarm for receiving the wireless signal and for effecting a warning signal.

Abstract: An advance warning device for monitoring the working conditions of a hydraulic braking system of a motor vehicle is composed of a plurality of sensors and a controller in communication with the sensors for processing the signals transmitted by the sensors so as to provide the operator of the motor vehicle with an advance warning signal as to likelihood of the brake failure. The sensors are intended to monitor respectively the temperature of the brake lining piece, the temperature of the brake fluid kept in the distribution pump, the water content of the brake fluid of the hydraulic braking system, and the hydraulic pressure of the hydraulic braking system.