door and prevent the extraction of the insert without opening or also removing the door locking mechanisms suitable for cooperation with the lock and jamb plate of the sliding door may be provided on each side of the insert to fasten the assembly in a closed position the lattice may constitute a large grille with ornamental features a small mesh screen capable of preventing insects and small animals from entering the premises or both application_number US 73738791 A description the heart of this invention lies in the novel working relationship of the various components constituting in combination the functional structure of this security screen referring to the drawings wherein like parts are designated throughout with like numerals and symbols fig1 illustrates a front elevational view of the preferred embodiment 10 of the invention shown in isolation as it would appear before insertion into the tracks of a conventional sliding door the screen insert 10 comprises a substantially rectangular frame 20 of the same height of the door for which it is intended rigidly encasing a sturdy screen lattice 30 for use with standard residential doors the preferred height is approximately 80 inches which corresponds to the vertical size of such doors the mesh of the lattice of the.