| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a door open and close device capable of automatically opening and closing a door to which large operating physical force is required at the beginning of the opening of the door or the like for a freezing refrigerator by a comparatively small-sized motor. <P>SOLUTION: When right and left movable levers 38 are rotated symmetrically, cam levers 39 fixed to rotating shafts 37 are turned integrally with the movable levers 38 while being abutted against cam rollers 41, a pushing force is generated by reaction in this case and a door 21 is pushed out in the opening directions by approximately 20 mm. An open and close operating physical force from a linear motor 4 moving the doors 21 in the opening direction from a door closing place is power-multiplied on the basis of the lever ratio of the movable levers 38 to the cam levers 39. The door in which a large operating physical force is required at the beginning of opening can be opened and closed automatically by the comparatively small-sized linear motor. A power-multiplying means 31 is formed in a simple constitution, and can be applied easily to the existing door. Since a locking means locking the movable levers 38 at rotary places is mounted, the open-close opertion of the door can be stabilized. <P>COPYRIGHT: (C)2004,JPO |
