Trim unit for facilitating the installation of lightweight window units

Claim 1

A TRIM UNIT FOR USE WITH A WINDOW UNIT CONSTRUCTED OF LIGHTWEIGHT CHANNELED MATERIAL, IN THE CHANNELS OF WHICH AT LEAST ONE WINDOW PANEL IS SLIDABLE, SAID TRIM UNIT AND SAID WINDOW UNIT BEING RECEIVED ON OPPOSITE SIDES OF AN APERTURE IN WHICH A WINDOW UNIT IS TO BE INSTALLED, SAID TRIM UNIT COMPRISING A FRAME-LIKE DEVICE INVOLVING TOP, BOTTOM AND SIDE EDGES AND ARRANGED TO INTERFIT WITH THE SIDE OF SAID WINDOW UNIT OPPOSITE THE CHANNELS THEREOF, TIGHTENING MEANS EXTENDING BETWEEN SA ID UNITS AT SPACED LOCATIONS FOR SELECTIVELY DRAWING SAID UNITS TOGETHER INTO CLAMPING RELATION ABOUT OPPOSITE PERIPHERIES OF SAID APERTURE, SAID TRIM UNIT IN CROSS SECTION COMPRISNG A PLURALITY OF PORTIONS SECURED TOGETHER IN AN INTEGRAL MANNER AND ANGULARLY DISPOSED WITH RESPECT TO EACH OTHER ABOUT A COMMON JUNCTURE, ONE OF SAID PORTIONS BEING DISPOSED AT AN ANGLE WITH RESPECT TO THE PLANE OF SAID TRIM UNIT AND BEING BROUGHT INTO CONTACT WITH SAID WINDOW UNIT DURINT THE DRAWING TOGETHER OF THE PAIR OF UNITS, FOR ENHANCING THE APPEARANCE OF THE SIDE OF THE WINDOW UNIT NEAREST THE TRIM UNIT.