Accidents armrest apparatus 165 Chapter VI Section I General technical requirements Section 166 Section 169 glass fence metal fence fence installation IV 176 178 Chapter VII Section 187 safety devices escalator possible 187 Section safety device to prevent uncontrolled coasting Section 196 anti-pinch protection device 205 IV 208 V Anti-fall protection safety equipment and facilities additional 212 VI additional brake braking torque calculation eighth 215 Chapter 223 Section electrical control system electrical control principle and circuit design control cabinet 234 Section 223 Section 239 Section IV electrical switching 243 V inverter and the energy-saving design of electrical wiring 250 escalators rung early wood production. Since the fire broke out after the London underground railway station in 1987, escalator service, most still use the original wooden rungs are into metal. Modern escalators rung to metal, Huimin escalators, each rung of the following section is triangular bracket. The bottom bracket is level two axes, escalators installed, the shaft with wheels. Two wheels on each side on a different track walk, by changing the distance between the tracks, so that the rung remains level. Escalator customization, Noah Witt elevator (online consultation), Huimin escalator by Texas Noah Witt Elevator Company. Texas Noah Witt Elevator Co. (www.dznywt.com) (www.dznywt.com) is an industry leader in Shandong Dezhou, machinery and industrial products, cooperation projects over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness policy, and satisfy customer needs. Noah Witt Elevator leadership with the staff warmly welcome all inquiries negotiations to create Noah Witt elevator a better future.