| 摘要 |
PROBLEM TO BE SOLVED: To poke out a stud at a single-action operation, which is left over in a chuck after welding, in the chuck holding the stud having a neck part. SOLUTION: A chuck main body 4 is formed into a cylindrical shape, and a stud-holding part 3 is provided at the opening part of the tip of the chuck main body 4. A poke-out bar 5 is inserted through on the axial line of the chuck main body 4 in the stud holding part 3, so that the tip of the pushing-out bar 5 goes in and out freely. The poke-out bar 5 is moved in the axial line direction by an operation part 7 from the outside of the chuck main body 4.
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