Abstract: The grooves on the floor to allow sliding of automatic doors in office buildings, hospitals, etc., can cause inconvenience or even accidents because the wheels of wheel chairs or high-heeled shoes can get stuck within the grooves. In addition, collection of rainwater and dust within the grooves impede the proper functioning of the automatic doors. As a counter measure to this problem, a caterpillar-like retractable groove cover was designed and made from stainless steel. Since the edges of the cover required high precision, high speed laser processing was applied in the making of its component parts. The caterpillar cover design, laser processing conditions, durability testing by repetition of door opening/closing etc. are explained in this paper. The covers developed through this study were installed in the automatic doors of a high rise building and have been found to be effective in overcoming the problems mentioned above. !0
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