| 摘要 |
PROBLEM TO BE SOLVED: To automatically open/close a hinged door by arranging an opening/ closing machine for generating torque by supply of a hydraulic fluid, and connecting an output shaft of the opening/closing machine and a door body by a freely extensible/contractible opening/closing link. SOLUTION: When putting a switching air valve 29 in a valve position (a), compressed air is supplied to an impeller chamber 11 by a compressed air source 30 to rotate a first impeller 16 to rotate a rotary shaft 14. Then, an output shaft 20 rotates via a driving bevel gear 18 and a starting bevel gear 19 to extend an opening/closing link 5 to open a door body 3. When putting the switching air valve 29 in a valve position (n), the air inflow to the impeller chambers 11, 12 is sealed to impart resistance to rotation of the first impeller 16 and a second impeller 17 to restrain a movement of the door body 3. When putting the switching air valve 29 in a valve position (b), the first impeller 16 is put in a no-load state, and since torque is generated in the second impeller 17 by the compressed air, the rotary shaft 14 rotates in the inverse direction to fold up the opening/closing link 5 to close the door body 3 to thereby automatically open/close a hinged door. |
