| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily operate the power source switch of an operation box with a key even when a crew is a person handicapped in fingers or even from the left side or right side watched from the crew. SOLUTION: At a main body 3 of box of operation box 1, a key hole 5 is formed through from side to side when a key hole part 11 is watched from the crew. A key 2 having a plug part 20 to be inserted into the key hole 5 can be freely inserted and ejected to the key hole 5 from both the left and right sides. Inside the main body 3 of box, a microswitch 4 is arranged for turning on/off the power source switch. A roller 6 of the microswitch 4 is protruded at the almost central part inside the key hole 5. The roller 6 is operated so as to turn on the microswitch 4 when the plug part 20 is inserted into the key hole 5 but to turn off the microswitch 4 when the plug part 20 of key 2 is ejected from the key hole 5.</p> |
