LIFTjournal 1-2021

Meiller has developed a completely new door that is to replace previously installed four-leaf folding landing doors. BY PETER WILL A  considerable number of driven landing doors, designed as  four-leaf folding doors, are to be found in various German  automotive industry factories and chemical industry plants. These doors were produced, distributed and installed about 30 to 40 years ago by two well-known German lift companies. Both manufacturers have in the meantime been integrated into groups and no longer offer such doors in this form. In the past, both specialist planners as well as operators have repea- tedly proposed developing a replacement product for the now old and fault-prone folding doors. NO MASONRY WORK Replacing these special doors by hinged or lifting doors has on various grounds not proven to be practicable. Consequently, Meiller decided to develop a completely new door that can replace both previously installed folding landing doors. Themost important requirement was that the instal- lation space of the new door had to be configured to enable the existing door types to be replaced 1:1 without any masonry work. Furthermore, all the safety aspects prescribed in the standard had to be observed. Although EN 81-20/50 does not mention driven folding landing doors, a folding door must at any rate by modern technical standards sur- vive an impact force of 150 Nm, have 10 J closing energy and 4 J forced closing energy. Meiller had the development of this door monitored by TÜV Süd from the start in order to guarantee the highest possible safety level here. LONG AVAILABILITY The result was the four-leaf driven folding door “Sinius”. All requisite safety levels have been achieved without the need for any additional measures to achieve this on site, such as light grids, lobbymonitoring, etc. The dimension range goes from 2,000 mm to 4,000 mm door width and from 2,000 mm to 3,000 mm door height. The door is in general delivered powder-coated and qualifies for protection class IP 54. “Sinius” has been designed for use in cars without car closure, but can also be combined with the roll-up door “Genius Plus I” from Meiller as car closure. Each door side is driven by a motor. The system is controlled by a premium controller of the MiDrive series. Since it is a sturdy industrial door, great store was set on guaranteeing the longest possible availability, even for dented door leaves. Replacing defect door wings does not entail any great effort. The sill does have to be cast on site, but replacing the guide segments of the sill in the event of damage is unproblematic. The “Sinius” door was primarily developed to achieve easy and un- complicated replacement of the existing four-wing folding doors of other manufacturers. The customer now receives amodern, standard-compliant product that will guarantee the functioning of the lift in the coming decades. Deployment of such doors is also conceivable in industrial and cargo lifts fitted with large hinged doors that are to be modernised. Whether there will also be new lifts fitted with “Sinius” remains to be seen, but this door is at any rate suitable. ⇤ meiller-aufzugtueren.de/en The author is Head of Product Management at Meiller 21 PRODUKTE  PRODUCTS