Patent ID: 6155750
Filing Date: 2000-12-05
Classification: E02D

Abstract:
A trench shield comprising:a pair of shielding wheels respectively rotatably mounted on a pair of retaining plates for rolling on a trench bottom in a trench excavation, each said shielding wheel served as a protective panel for shielding a side wall of the trench excavation;a plurality of brace members each said brace member passing through said two retaining plates and having opposite end portions of each said brace member retaining said two wheels against two side walls of the trench excavation; andtwo control means each said control means mounted on each said retaining plate for rotatably securing each said wheel on said retaining plate; said control means operatively locking said wheel for stopping the trench shield within the trench excavation for working therein, and said control means operatively unlocking said wheel to allow said wheel rolling on the trench bottom for moving the trench shield in the trench excavation.