| 摘要 |
PROBLEM TO BE SOLVED: To provide a natural lock device simple in structure and inexpensive and capable of machining a work even from the side supported on the natural lock device. SOLUTION: A chattering preventive device 34 is furnished on a natural lock device 2, the natural lock device 2 and the chattering preventive device 34 are operated by a nut runner, a pressure rod 50 integrally provided with the nut runner and a push bar 51 for locking, and a work W is sandwiched by a support rod 4 and a support pin 41. Consequently, an actuator is neither required on the natural lock device 2 nor on the chattering preventive device 34, both of the devices 2 and 34 are simplified in structure and become inexpensive. Additionally, as the work W is sandwiched by the support rod 4 and the support pin 41, it is possible to machine the work W from a direction to support it by the support rod 4 and a direction to support it by the support pin 41 and to prevent chattering.
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