Double-chain window or door operator

The present invention relates to an operator for opening and closing a door or a window, comprising a motor-driven double-chain operator with two chain members, both flexible in one direction only, said chain members being accommodated in the closed position of the door or the window, in a substantially closed operator housing, in which the chain members are individually in engagement with a rotating drive member in communication with outlet openings for the chain members, and separate chain paths connected therewith, from which the chain members may be joined in a back-to-back arrangement for the provision of a rigid operator member, the two chain members being composed of chain links having hinge parts with parallel rotational axes oriented transversely to the direction of propagation of the chain member in the associated chain path in the operator housing for engagement with neighbouring chain links in the same chain member and having a back surface provided with zip-like engagement members for engagement with corresponding engagement members on the back surfaces of adjacent chain links in the other chain member for securing the chain members in the joined operator member against displacement transversely to the opening/closing direction, whereby the substantially closed operator housing and coupled free ends of the chain members are connected with profile members of the frame and sash structures of the door or the window, said profile members being positioned opposite one another and extending transversely to the opening/closing direction of the door or the window. A door or window operator includes a motor-driven double-chain operator with two chain members in a substantially closed operator housing separately in engagement with a rotating drive member and joined in a back-to-back arrangement. The chain members include links having hinge parts with parallel rotational axes oriented transversely to the direction of propagation of the chain member for engagement with neighboring chain links in the same chain member and having a back surface provided with zip engagement members for engaging corresponding engagement members on the back surfaces of adjacent links in the other chain member for securing the chain members in the joined operator member against displacement transversely to the opening/closing direction. The chain members allow a mutual displacement between neighboring links in the direction of the rotational axes and the separate chain paths ex