Roller assembly and guide for a retractable screen

A roller assembly for use with a horizontally opening retractable screen including a flexible screen with an upper toothed edge and a lower toothed edge, and for use with upper and lower guide tracks, the upper guide track having an upper elongate retaining channel in which the upper toothed edge is received, the lower guide track having a lower elongate retaining channel in which the lower toothed edge is received, said roller assembly comprising:

• a roller having an upper end and a lower end, said roller being configured to permit rolling of the flexible screen thereon when the flexible screen is open and unrolling of the flexible screen therefrom when the flexible screen is closed;
• an upper end cap having an upper end cap body to which said upper end of said roller is rotatably mountable;
• a lower end cap having a lower end cap body to which said lower end of said roller is rotatably mounted;
• an upper guide arrangement comprising an upper guide member that is engageably receivable within said upper end cap body so as to define an upper guide passage with a first side wall of said upper guide passage defined by said upper guide member and a second side wall of said upper guide passage defined by an inner surface of said upper end cap body, said upper guide passage having an upper exit aperture through which the upper toothed edge passes during unrolling of the flexible screen and is configured to communicate with the upper elongate retaining channel, said first side wall having a first upper guide rail that is upwardly inclined towards said upper exit aperture and said second side wall having an opposite second upper guide rail that is upwardly inclined towards said upper exit aperture for guiding the upper toothed edge upwards towards said upper exit aperture, said upper exit aperture being configured to retain the upper toothed edge from being pulled out of said upper exit aperture as the upper toothed edge passes through said upper exit aperture;
• and
• a lower guide arrangement comprising a lower guide member engageable with said lower end cap that is configured to guide said lower toothed edge of said flexible screen into said lower elongate retaining channel of said lower guide track, said lower guide arrangement defining a lower guide passage having a base and a lower exit aperture through which the lower toothed edge passes during unrolling of the flexible screen and is configured to communicate with the lower elongate retaining channel, said lower exit aperture being configured to retain the lower toothed edge from being pulled out thereof as the lower toothed edge passes through said lower exit aperture, said lower guide member including an upwardly inclined guide ramp defining said base of said lower guide passage for guiding the lower toothed edge into said lower exit aperture.