Cross-connector of plastic material for a window grill construction

A cross-connector of plastic material provided with four legs mutually positioned perpendicularly to each other for the use in connection with hollow profiled window grill bars extending mutually perpendicularly to one another, where said legs can be inserted into the ends of said crossing profiled bars in order to connect these profiled bars to each other, wherein the legs of the cross-connector are configured to form a skeleton body provided with numerous break-throughs, or alternatively recesses, separated from each other by an enforcing structure of rods extending parallel and perpendicular to the longitudinal axes of the legs, said rods running into the outside walls of the legs forming thin wall members of the skeleton body where said wall members are provided on their outside surfaces, at least partially, with angled pins positioned oblique to the direction of insertion of the legs into the hollow profiled bars.