Abstract: A handle includes a tubular member including two parallel helical recessed portions formed on an outer periphery thereof, a rubber jacket mounted around the tubular member, and two heating coils of different heating efficiency being respectively mounted in the parallel helical recessed portions for heating the rubber jacket. Two-stage control of heating for controlling the temperature of the rubber jacket in response to the temperature of the environment is provided.

Abstract: A protective hat is designed to protect the head of an infant and is formed of a shell and a jacket fitted over the shell. The shell has a projecting front brim, two projecting side brims corresponding in location to the ears of an infant, and a number of ventilation holes. The jacket is formed of an inner layer, an outer layer, and a space located between the inner layer and the outer layer for receiving the shell. The jacket is provided with a chin strap and a zipper to facilitate the fitting of the jacket over the shell and the removing of the jacket from the shell.

Abstract: A trench shield includes a pair of shielding panels for protecting opposite side walls of a trench excavation, two side frames are provided for restively adjustably securing the two shielding panels on the two side frames, and have a plurality of brace members spaced between the two side frames for retaining the two side frames and the two shielding panels, and two rolling devices respectively are mounted on a front bottom portion and a rear bottom portion of the trench shield for carrying the trench shield to be ridable and movable on a pipe under construction in the trench excavation. Upon rolling of the rolling devices on the constructing pipe, the trench shield will be conveniently moved on the pipe without any obstruction.

Abstract: A trench shield includes: a pair of shielding wheels rotatably mounted on a pair of retaining plates; a plurality of brace members passing through two retaining plates for retaining the two shielding wheels, each shielding wheel formed as a protective circular panel for shielding a side wall of a trench excavation for preventing collapse of the trench walls; and two control devices each provided for locking or unlocking each shielding wheel on each retaining plate; whereby upon unlocking of the wheels from the retaining plates and upon rolling of the wheels in the trench, the trench shield will be forwardly moved conveniently and smoothly.

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 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.

Abstract: An industrial safety helmet comprises a shell of a semioval shape, a crad and a chin strap. The shell has one or more flexures capable of strengthening the shell and of promoting air circulation of the shell. The flexures are provided respectively at the front end thereof with an air inlet while at least one of the flexures is provided at the rear end thereof with an air outlet. The cradle has an energy-absorbing mechanism. The chin strap is provided with a detachable adhesive buckling mechanism.