To improve workability and safety by positioning a location of manual work at a lower point in replacing the signboards of name of racetrack, a host and the like.
An insertion part of a signboard 16 is retained on a retaining metal of a racetrack name plate given a downward position and a engaging part 16c of a bracket 16b of the signboard 16 is matched with an index plunger 73. A knob part 76b is turned from an engagement releasing position where a protruded part 76c is retained on a circular side 74c of an index body 74 to an engaging position where a mating recessed part is put onto the protruded part 76c. Thus, an internal end part of the plunger part 76a is inserted into an engaging part 16c of the bracket 16b to fix the signboard 16 on the racetrack name.
SHIMIZU KAZUNOBU
MUKAI YASUNARI
SILVER BIRUTO KK
JAPAN STEEL WORKS LTD
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