| 摘要 |
PROBLEM TO BE SOLVED: To provide clock type learning material, preventing an indicating plate from slipping from a groove without sticking a face to a body. SOLUTION: This clock type learning material includes: a slide groove 12 including a ring-like recessed part formed on the body 10; the indicating plate 20 formed by an annular disc and disposed in the slide groove 12 to freely move between the indicating position and the non-indicating position; an indication operating part 22 projected on the indicating plate 20 and protruding from the body 10; a locking projection 24 projected toward the back of the indicating plate 20; and an engagement receiving part 19 formed in the slide groove 12 to engage with the locking projection 24. In operating the indication operating part 22, the indicating plate 20 moves between the indicating position and the non-indicating position in the slide groove 12 while the locking projection 24 engages with the engagement receiving part 19 in the direction of X from the indication operating part 22 toward the center O of rotation of the indicating plate 20. COPYRIGHT: (C)2011,JPO&INPIT
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