| 摘要 |
PROBLEM TO BE SOLVED: To provide a graver for improving safety, and reducing cost.SOLUTION: A graver 11 comprises a body 15 for installing a blade body part 17, a protection part 21 slidably constituted to the body 15 between a first position of enclosing an edge 18 and a second position of not enclosing the edge 18, a switching part 25 rotatably arranged by being connected to the body 15 by a first shaft 31 and a connection part 28 having one end connected to the body 15 by a second shaft 32 and having the other end connected to the protection part 21 by a third shaft 33. A tip 22 of the protection part 21 moves to the first position when a tongue piece of the switching part 25 exists on the blade body part 17 side and the tip 22 of the protection part 21 moves to the second position when the tongue piece of the switching part 25 exists on the opposite side, respectively. With such a constitution, safety of the graver 11 is improved, and cost is also reduced. |
