Supporting bracket for windows

A supporting bracket, comprising:

• (a) a track member having a pair of folded side flanges along the length thereof with at least one of said folded side flanges which is subjected to face toward a window sash being discontinuous at a central part thereof to define a cutout part;
• and a boss provided with a pivot pin having a central groove and a C-ring;
• (b) a slide movable along said track member;
• said slide having a length substantially equal to the length of said cutout part of said track member;
• (c) a strut pivotally connected to said track member in spaced relation to said slide;
• said strut being detachable from said track member with the use of said C-ring;
• (d) a brace pivotally connected to said slide and said strut;
• (e) a link pivotally connected to said slide;
• (f) a sash arm pivotally connected to said link and said strut;
• and
• (g) a stop member being substantially of a button shape having a central groove;
• said stop member having a rounded portion and a flattened portion;
• said stop member being turnable to a position with its rounded portion facing said slide to keep said slide within said folded side flanges and being turnable to a position with its flattened portion facing said slide such that said slide is releasable from said track member from said cutout part.