The scissor unit (10) connects a window casement to a fixed frame has a control arm (18) movably mounted on the pane and a bolt member (30) movably mounted on casement and interacting with a control curve (32) on an underneath side of the control arm facing the casement. The control arm has a shank angled towards the casement at least in the area of the control curve and/or in the area of an arm length adjustment device on its front longitudinal edge relative to the first tilting direction (A). The bolt member can leave and enter the area of the control curve underneath the arm unimpeded by the angled shank. The control arm at least in the area of the control curve preferably has an L, U or C shaped cross-section perpendicular to arm length direction.
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