| 摘要 |
Method for manufacturing the frame for service and closing hatches or similar hatch shutters intended for roof and/or wall mounting, in which a fabrication is first produced from a piece of suitable material and the frame is then formed by bending the frame to conform to indentations 8 made in the fabrication in order to form three walls, the middle wall 10 of which is essentially vertical and the upper and lower walls 11, 12 of which are essentially horizontal. <IMAGE> |
