PURPOSE: To prevent invasion of dust and the like from outside by employing a closing structure using an electronic lock instead of an engagement structure with a locknut and a lock for locking and locking.
CONSTITUTION: An inner groove 5 is made at the rear end part of a locknut 1. A lock 7, which is made of non-magnetic material, is provided with a sliding piece 11 in its projecting stage part 9. Said piece 11 is fixed against a spring 14 through engagement of a bar magnet M with a circular groove 29. At this time, a pressing element 16 in the sliding piece 11 is pressed and a steel ball 24 is pushed outward. When the locknut 1 is covered with a lock 7 and pressed, the steel ball is engaged with the inner groove 5. Since this causes the lock 7 to idle, the locknut 1 can not be loosened. When the bar magnet M of an electronic lock is disengaged from the circular groove 29 by means of a key 31, the lock 7 can be locked.
HIROKAWA TOORU
HORIE HIROICHI
| JP52069731B |