To improve replacing work efficiency of a signboard indicating a name of a racetrack, host and the like by making the lowering position of the signboard lower.
A first bracket 21 of a main frame 1, a second bracket 22 of the signboard 15, a journal pin 28 to join the brackets 21 and 22, and a fixed pin 23a fixed to the signboard 15 are formed. A hook part 25a, which is supported on the main frame 1 to rock freely by the supporting pin 29 and can be engaged and released from the fixed pin 23a, are formed on the upper end, and a working part 25b are formed on the lower front. And an elastic body 31 elastically holds the engaging of the hook part 25a and the fixed pin 23a. The hook part 25a, which is engaged to the fixed pin 23a, presses the working part 25b to rotate around a supporting pin 29. Thereby, the engaging of the hook part 25a and the fixed pin 23a of a lock arm 25 is released, and a push member 26 elastically pushes the lower side of the signboard 15 upward through the force of a spring.
| JP2838769 | OPERATION DECIDING DEVICE |
| JPS59154300 | [Title of the device] The starting block for a pool |
| JP2006034918 | STARTING BLOCK |
SHIMIZU KAZUNOBU
MUKAI YASUNARI
SILVER BIRUTO KK
JAPAN STEEL WORKS LTD
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