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A weight-and-pulley system serves as the basic counterbalance mechanism which operates box sash windows. The system contains cast-iron or lead weights which hide inside the box frame while cords or chains connect these weights to the sashes through pulleys positioned at the top of the frame.
The weights shift in reverse direction when the sash moves which counterbalances its weight to produce smooth operation and position stability.
The historical engineering solution of the past maintains its value because it provides dependable authentic results for heritage window restoration work.
Vacuum Insulated Glazing (VIG)
Vacuum Insulated Glazing (VIG) is an advanced, ultra-thin double-glazing solution ideal for historic and period properties. The VIG system employs […]
Bow sash window
The bow sash (or bow-faced sash) is a unique and particularly attractive form of sash window. Existing in a few […]
Low-E glass
Low-E (low-emissivity) glass contains a thin metal coating which allows sunlight to enter but bounces heat back into the room. […]
