| 摘要 |
<p>PURPOSE:To improve the operability of a door by arranging a rotary key with an engaging groove at the tip of a rotatively displaceable arm projected on the back of a door for a heating chamber so as to be locked with an engaging section on the body side when the door is closed. CONSTITUTION:When a door 5 is turned to close it holding a control handle 23, a rotary key 12 enters the body 1 passing through a key insertion port 19 to bring a pin body 20 into contact with an engaging groove 13. Then, the rotary key 12 moves eccentrically engaging the perimeter of a circular arc section 20a of the pin body 20 and finaly engages the top thereof 20a by the force of the door 5. This causes the eccentric rotation fulcrum 14 of the rotary key 12 to move to the opposite side beyond the top of the pin 20 and actuates the regulating force of an arm 7 to ensure a complete engagement thereof. When the door 5 is turned to open, the arm 7 and the rotary key 12 are driven opposite to each other to release the locking. This can improve the operability with a simple construction.</p> |
