Casement structure capable of staying at any position

The utility model discloses a casement structure which is simple in structure, and can be positioned and stays at any position opposite to sliding rails on both sides of a window body. The casement structure comprises window body sliding rails (1) which are arranged on two sides of the casement structure and at least one casement (2) which is arranged in the middle and can move along the window body sliding rails (2), battens (7) are fixed on inner sides of the window sliding rails, continuous sawtooth-shaped steps (8) are arranged on the battens (7), at least one group of positioning devices (9) is arranged on both lateral sides of the casement (2), and the positioning devices (9) are adaptive to all grooves of the sawtooth-shaped steps (8). When the casement conducts motion along the window sliding rails (1), and the casement can position and stay in any groove of the sawtooth-shaped steps (8) with the help of the positioning devices (9). Due to the fact that the sawtooth-shaped steps (8) are continuous, the casement structure achieves the aim that that casement structure can be stayed at any position.