| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a self holding solenoid capable of door locking in the closed time, by providing the solenoid only without providing a locking mechanism at all. SOLUTION: The figure displays the door locked state by the self holding solenoid in the closed time of the door. When an iron-made door 8 is closed, the door 8 comes into contact with a case 1 at the end face. Thus, a permanent magnet 2 forms a magnetic path, i.e., an end case 1' - the case 1 - door 8 - a bush base 5 - fixing base 3, so as to suction hold the door 8 on the self holding solenoid side. Accordingly, the door can be prevented from opening by vibration or shock, etc. Besides, in the opening time of the door 8, a coil 6 is impressed with a voltage to cancel the magnetic flux of the permanent magnet 2 immediately before opening the door 8. Thus, the suction holding force between the door 8 and the case 1 is eliminated, and at the same time, a spring 4 pushes the push base 5 so as to separate the door 8 from the end face of the case 1. Through these procedures, the magnetic circuit can be disconnected, thereby enabling the door 8 to be brought into the free operable state.</p> |
