| 摘要 |
611,676. Door-operating gear. DE VRIES ROBBE & CO. N. V. May 6, 1946, No. 13618. Convention date, June 20, 1942. [Class 65 (i)] [Also in Group X] A tiltable door 1 is of the type in which a pivot 4 connected thereto is adapted to move in an arc around a fixed pivot 3, the pivots lying substantially in the vertical plane containing the centre of gravity of the door when the latter is closed and the door being connected by a cable 7 to a counterweight 11. The cable is fixed to the door at a point 8 and is run around a roller 13 so mounted at the lower end of the door that the cable leaves the roller at a point in front of the said vertical plane. |
