SUCCESS STORIES
Ding Dong Merrily on High after 18 months
Figure 1: After 18 months, the Petersglocke of Cologne cathedral is ringing again.
© Dörken MKS
R
inging out again of silence: the bell
“Petersglocke” of Cologne cathedral (Fig. 1). Traditional bell technology meets state-of-the-art construction and coating techniques. In the summer of 2016 an investigation by the European competence centre for bells ECC-ProBell revealed that uneven © Dörken MKS
striking of the clapper – as a result of the offset hole in the bell cover – meant that the “Dicke Pitter” was no longer emitting its
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Figure 2: The even zinc flake coating protects the mount of the bell clapper as well as the clamping nut against corrosion. © Dörken MKS
customary sound. It was subsequently discovered that a repositioning of the bell clapper could not only result in an improved sound, but also contribute to the long-lasting protection of the Petersglocke. In collaboration with the Cologne University of Applied Sciences, the cathedral construction authority developed a new mount, to be realised by the company Dirostahl. The special feature of this mount? It is milled from a single forged piece and can be moved horizontally to the millimetre via two double eccentric components. In addition, it is also
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equipped with a HEICO-TEC® clamping nut that guarantees a defined torque
Working together with inhouse
A particular benefit of the new product:
in the rod that carries the clapper and
and contract coater Lisi Automotive
The protective coat has a thickness
secures the bell. This mount is unique
BETEO Oberflächentechnik GmbH & Co. KG,
of just 4–20μm and dries at room
of its kind worldwide.
the company applied the newly-developed
temperature, eliminating the need for
It is all the more important that this
product DELTA-PROTEKT® KL 170 RT
a curing oven. This meant that it could
bearing element is protected against
to coat the mount. The sacrificial behaviour
be applied to the 780 kg component on
corrosion. This is where the corrosion
of the zinc flake coating delivers cathodic
site, in the belfry of Cologne cathedral,
experts from Dörken MKS came in.
corrosion protection (Fig. 2).
via spray application (Fig. 3).
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N. 55 - JANUARY/FEBRUARY 2019 - international PAINT&COATING magazine