| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the attachment and detachment of a grating by allowing holes made to pierce through each corner of the grating to fall over pins set up on a beam member, and providing locking means in which the grating is engaged by pins. SOLUTION: An inverted J-shaped groove 14 opened circumferentially at the lower end is formed on holes 12 made at four corners of a grating 10; which, a cylindrical body 13 having an operational projection 15 is accommodated at the upper end, and a pin 32 formed with projection 33 on its circumference is set up on the plate 30. When the pin 32 is dropped in the hole 12 and a tool is inserted in the groove provided on the upper surface of the operational projection 15 in a state of the groove 14 engaged with the projection 33 to be turned while the cylindrical body 13 is pushed in the hole 12, the projection 33 becomes a guide to turn the cylindrical body 13, and thereby the projection 33 moves to the deepmost recess end of the groove 14. As the tool is removed, the urging force of a spring 17 pushes the cylindrical body 13 upward, so that the projection 33 is housed in the end part of the groove 14. Since the pin 32 is dropped in the hole 12 and engaged by the locking means, attachment work becomes easy, and as the locking means is released, detachment is also conducted readily.
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