JPS649094A - Joint structure of mast for board - Google Patents

Abstract

PURPOSE:To always smoothly shift a transfer member by constituting the titled structure so that a U-shaped guide part opposed on the both sides in the direction of width onto a mast rail and inserting the both side parts of the transfer member into a guide part and transferring the transfer member in the guide part through projections formed onto the transfer member. CONSTITUTION:A mast rail 2 consists of a bottom 25, both side walls 23, upper wall 24, and an intermediate wall 26 on the sectional surface form, and a guide part is formed from the both side walls 23, upper wall 24, and the intermediate wall 26. A transfer member 5 is inserted into the guide part, and shifts in the state where the projections 54-56 are attached and approached with the both side walls 23, upper wall 24, and the intermediate wall 26. With such constitution, a gap is formed between the guide part and the outer peripheral surface of the transfer member 15 by the projections 54-56, and when sand, etc., are bitten into the guide part, said sand can be removed easily by spraying water by a hose.