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    • 4. 发明授权
    • Mutually counterbalancing upper and lower flap doors of wide doorway
    • 宽门口的上下折门相互平衡
    • US4024671A
    • 1977-05-24
    • US615855
    • 1975-09-23
    • Masao Isobe
    • Masao Isobe
    • E05F17/00E05C7/06
    • E05F17/00E05Y2900/531
    • Upper and lower flap doors respectively hinged to an upper lintel member and to a lower sill member of a doorway frame constituting almost the entire side wall of the body of a van type motortruck to swing open respectively outwardly and upwardly to a horizontal position and outwardly and downwardly to a vertical position are intercoupled by a coupling device comprising two coupling mechanisms installed close to two posts constituting side members of the doorway frame, each coupling mechanism comprising members intercoupling the flap doors to synchronize their movements and cause gravitational forces acting thereon to counterbalance each other, thereby reducing the physical effort required for manual opening and closing of the doors.
    • 上下翼片门分别铰接到上楣构件和门槛框架的下槛构件,其构成几何形状的厢式车厢的主体的整个侧壁,以分别向外和向上摆动到水平位置和向外, 向下到垂直位置的联接装置由耦合装置相互联接,该联接装置包括两个联接机构,该联接机构安装在靠近构成门口框架的侧部构件的两个支柱上,每个联接机构包括彼此相互联动的挡板门,以使其移动同步并且使作用于其上的重力平衡每个 从而减少手动打开和关闭门所需的体力。