Window handles

FSB's newly conceived ball-catch mechanism – a particularly rugged fusion of components in hardened and tempered steel, high-grade steel and glass fibrereinforced plastic – is further enhanced by its compact design and ideal mode of assembly. 

The new system is operated in the same way as FSB's long-standing ball-catch mechanism for roses, employing both tactile and audible means to aid dependably correct operation of the window to ergonomic effect. Key to this is the way the handle can be felt and heard clicking into position at 90° intervals when the window is opened, closed or tilted. FSB’s fine new hardware is engineered to deliver 25,000 operations/150,000 click-stop events (180° turn-and-tilt cycles), earning it the highest quality rating for operating endurance of 5/180 under EN 13 126-3. The RAL Quality Assurance Association has re-aligned its requirements with the criteria set forth in DIN EN 13 126-3, meaning that hardware merely now needs to endure 10,000 tilt-turn cycles in 180° mode to qualify for the RAL quality kitemark.

EN 13 126-3 defines requirements for window handles that serve to ensure unchanging quality and fitness for function over a great many years.

Engineered to deliver sustainable longterm functioning, the mechanism comprises steel ball bearings and attendant steel springs housed in recesses within the rose assembly. Bearings and springs are arranged in double formation around a high-grade steel disc that has four recesses for this purpose and is rigidly attached to a dedicated adaptor. The resultant turnably fixed ball-catch mechanism ensures that each act of repositioning the window handle can be felt and heard. The actual window handle is fitted to the front of the adaptor. Running axially along the inside of the latter, meanwhile, is a square-sectioned spindle that can be variably positioned to facilitate flexible spindle projections. A cup point screw is used to secure the window handle to its spindle once the rose assembly has been fitted.

Tilt-to-turn

Special-action lockable handles are required in conjunction with the “tilt-toturn” window drive mechanisms often fitted in schools, offices and hospitals to prevent unauthorised operation whilst guaranteeing adequate ventilation.

Please note: windows with a “tilt-to-turn” action are fitted with non-standard-conformant window drive mechanisms in order to ensure the function described. On its own, a window handle equipped accordingly does not fulfil this function. Please take this into account at the planning and tendering stages.

Tilt-to-turn window handles do not conform to either the RAL quality standard or DIN EN standards 1627 to 1630, furthermore.