Since 1977 Wittur supplies the lift industry with versatile and high-quality doors.
Since 1977 Wittur has been providing the lift industry with versatile and high-quality doors. More than 30 years later Wittur is the leading company in the lift doors segment, with state-of-the-art technical solutions and unparalleled product range. Regardless of whatever your lift requires - a round door with panoramic panels rather than a straight or a folding one - Wittur can supply the best solution for your needs.
Research for innovative solutions and rigid control of product quality are key features of Wittur Safeties. 
Wittur offers a wide range of car and counterweight frames. Modularly conceived, these components are very flexible in terms of rated load, height and width. The wide range of accessories includes safety gears, suspension pulleys, compensation chain and travelling cable hangers, allowing configurations suitable for different shaft layouts, lift designs and rated speeds. Wittur can also supply special frames for tailored projects.
Research for innovative solutions and rigid product quality control are key features of Wittur Safeties.
According to EN81-1/2 A3 and EN81-21 A1 (new lifts in existing buildings), new lifts installed after January 1st 2012 must be equipped with a system to prevent a car moving away from the floor with the landing door not in the locked position and the car door not in the closed position.
Since 1977 Wittur supplies the lift industry with versatile and high-quality doors..jpg)
Since 1977 Wittur supplies the lift industry with versatile and high-quality doors.
Since 1977 Wittur supplies the lift industry with versatile and high-quality doors.Safety gear for ascending car overspeed protection
WGRB04
The WGRB04 is a guide rail braking system used as ascending car overspeed protection. It acts on the car guide rail and reduces the car speed according to the standard EN81-1:1998 chapter 9.10.
The braking force is limited by a disc spring loaded counterwedge. If the breaking force turns to high, the disc springs will be compressed and therefore the breaking force is limited.
The adjustment is carried out and sealed in the factory according to the load and rail conditions.
Technical Features
| max. nominal speed v [m/s] | 6 |
| max. tripping speed vmax [m/s] | 7,54 |
| max. tripping force of the overspeed governor [N] | 2350 ± 250 |
| applicable widths of rail head (dry, lubrication prohibited) k [mm] | 16 / 19 |
| minimum width of guide rail running surface n [mm] | 30 |
| max. braking force [N] | 78500 |
| min. braking force [N] | 25000 |
| max. deceleration dmax | 1g (9,81 m/s²) |
| Weight per pair [kg] | 68 |
| Temperature during operation [°C] | -20 ... + 50 |
| Temperature during storage [°C] | -40 ... + 70 |
| max. Air humidity | 95 % / + 25 °C 93 % / + 40 °C |
Contact
Martin Tang,
Key account manager for KONE
Lucifer Li,
Key account manager for Schindler
Jeff Bian,
Key account manager for OTIS
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