Frames that feature a Cast handle – sashes with bar are sliding sashes of aluminum glass that have a cast handle which protrudes and functions as a grip. What are the advantages and disadvantages of the Cast handle – sashes with bar:
Advantages:
• Eliminates the ”bowing” phenomenon in thermally broken frames (see below).
• Ideal for frames with significant height.
• Increases wind pressure resistance.
• Easy to use, especially for large frames.
• Reduces deflection.
Disadvantages:
• Cannot accommodate knobs or handles, only recessed pulls.
• Some consider it unaesthetic.
Bowing phenomenon in thermally broken frames
What is the bowing phenomenon that appears in dark-colored thermally broken sliding frames? Thermally broken frames (glass sashes) are divided into two sections: an inner section and an outer section, with insulating material (e.g., polyamides) inserted in the middle, which provides thermal insulation (see more on thermally broken frames). When dark-colored thermally broken frames are directly exposed to intense heat and sunlight, they expand externally due to the heat. However, a different temperature prevails inside the house (air conditioning, etc.), causing the aluminum to contract. This makes it difficult to lock the glass sashes (due to linear expansion of only the outer side of the hybrid sash) and often causes them to rub or hit. This only occurs during hours when the sun hits the aluminum on very hot days and in dark-colored frames.
The phenomenon does not occur when there is adequate shading or when the frames are painted in light colors. The Cast handle – sashes with bar prevents this phenomenon as they do not allow linear expansion.
