Being a partner of the industry and as one of the leading innovators of the market, we are continuously developing our products as well as ourselves and we always are implementing new ideas. What’s new? Which patent applications have been made recently? Which technologies are we using?
In the category „Latest news“, you will find the answers to these and many other questions. Because as a partner oft he international automotive idustry, we always have some interesting news for you. So it is worth it to frequently have an eye on these categories.
On 3 June 2020, we showed numerous representatives of regional and supra-regional public utility companies the way to do this with a product showcase of our new glass divider for city buses.
The Driver Protection System, or DPS for short, is a glass divider built on the swivelling ticketing area next to the driver area of modern city buses. In this period marked by the Coronavirus, the system offers increased protection for the driver in terms of hygiene. Cut-outs in the glass enable the ticket to be issued or payment to be made. The divider can also play a part in protecting the driver from attacks. This requires the use of laminated safety glass. The DPS uses anti-glare glass in various designs (which are related to the remaining reflection) as standard to minimise reflections.
We have achieved the impressive feat of adapting our new system to various vehicle types from renowned city bus manufacturers - all in just a few weeks. These bus types are a representative cross-section of the vehicle types used by almost all German transport companies, and were available at our product showcase.
Impressive active driver protection and economic benefits
Our new divider is not only a question of occupational safety, with the DPS also offering economical benefits. The isolation of the driver’s work area means there are no longer any cash takings. The Driver Protection System is a significant step towards normalising economical driving operations: safe boarding in the driver’s area can be resumed, and therefore the purchase and checking of tickets.
Strong interest across Germany
The guests present - crew, buyers and workshop managers - did not only come from the immediate surroundings such as the Ennepe-Ruhr area, Solingen, Remscheid, Dortmund and Bochum, but also from Berlin (BVG), Münster and Cologne (KVG). We used the product showcase to introduce an innovative, technical development which will able to gain attention across Europe. A DPS pilot project is currently being implemented with the Wuppertaler Stadtwerke public utility company and the product has already proven itself to be ready for series production. The prerequisites for this are TÜV approval and obtaining a positive assessment from driving trials by Wuppertaler Stadtwerke.
... and now it’s ready for use by our customers: the side-hung window has ISO glazing and places high demands on its design due to the heavy weight resulting from its dimensions. The window weighs in at approx. 40 kg – 20 kg of which is accounted for by the glazing alone. The viewing area measures 800 mm x 660 mm.
The weight of the window glass (28 mm laminated safety glass/toughened safety glass ISO) combined with the window’s dimensions could quickly result in imprecise opening and closing if the design wasn’t as sophisticated as it is, i.e. the window snags when opening and no longer closes precisely and tightly.
This problem has been eliminated through the use of a two-point lock and opening via an integrated gas strut. The new side-hung window also offers a latch position at 10°, which can be fixed using the ergonomic rotary handle.
The opening angle is also restricted to 90°.
This week Cleff produced its largest ever sliding window for use in the rail industry. The dimensions (external dimensions) of 2028 mm wide x 1317 mm high with an opening clearance of 1644 mm wide x 445 mm high are unusual and require complex and extensive preparation work – particularly with regards to the weight of the countersunk part, which weighs approx. 30 kg due to the window’s dimensions.
Ergonomics was the main focus of our development: the countersunk part, in other words the extremely heavy sliding area of the window, had to be user-friendly and easy for passengers to move.
This was achieved through our proprietary “Soft Elevation System” (SES), which significantly reduces the opening and closing forces thereby allows even heavy window elements to open and close effortlessly.
The design and implementation of a large, yet easy to operate window: another exciting challenge we were glad to face.
A special construction feature was implemented for one of our long-standing customers. The top-hung windows were
intended to be closed by the passengers – but only to be opened by the driver. We complied with this special wish of our
customer with a respective construction feature: now the window can only be opened by the driver with a key tool. The
background of this necessary construction change was the special climatic and safety technical requirements for the
window and its design.
Motorhomes place high demands on all aspects of functionality, design and longevity. This also applies without limitation to the driver and passenger windows in our product range.
The windows on the driver’s side for fully integrated motorhomes should not of course require too great a sliding effort to open and close them. At the same time, the window should not suddenly open or close “by itself”, e.g. when braking or accelerating. In addition, one of the requirements was to exactly measure the construction and range of movement of the window handle in order not to affect the function of the blinds situated in front of the window. The constructive solution of the window mechanics and the ergonomic design of the handle – with very little construction space available – was the main focus of this development in order to ensure a good compromise between comfort when using the handle and the best possible level of safety.
The year 2020 has begun, which is also a very special year for us. Since 1935, the Wuppertal-based company Cleff has been finding answers to questions such as: What is the best window solution for your vehicle?
What is the best door design to ensure that it functions safely and reliably in the long term?
Is there a large selection of spare parts for your train, commuter train, bus or passenger ship?
These questions are just as important today for many international vehicle manufacturers as they were 85 years ago – and Cleff provides answers with flexibility, fair prices and reliable delivery of high-quality products – today, just as we did back then. Our optimal and individual solutions have ensured the company‘s continued existence for decades – be it for small, medium and large quantities.
Feel free to download our anniversary brochure „Producing vehicle windows and doors since 1935 – Over the course of time“. Discover how our company has developed over the past 85 years and learn more about our exciting company history from 1935 to the present day. Join us in our anniversary year and celebrate 85 years of vehicle windows and doors from Wuppertal with us at Innotrans 2020 in Berlin in September.
For more than 80 years, Cleff has been the brand for individual vehicle windows and doors.
Starting with the compilation of all customer wishes and the planned usage, continuing with the meticulous in-house construction and development, into which we incorporate the empirical values of decades of experience, up to the initial sampling and serial production: the Cleff company illustrates the entire development and production process. This also includes, e.g. the possibility for pressure cycle testing according to the UIC in our in-house test centre. Do you need a small series for a nostalgic train? No problem.
You want trains or busses equipped with a bigger series of innovative windows? We will be pleased to take this on. Your locomotives require doors with numerous functions? Cleff is your partner to contact.
Regardless of which vehicle you wish to refurbish – the Cleff company will supply you.
And the range of services extends even further. Cleff also offers complete solutions with a comprehensive range such as door frames, locking systems and gaskets – profit from the product range of an experienced full-service company to supply your system needs.
In particular, nostalgic trains or busses for sightseeing tours need individual windows and doors. The same applies to special and commercial vehicles … the Cleff company supplies windows and doors for trains, busses and ships – but also offers small series for vehicles which are seldom used, or used just once, and are therefore highly individual. The island railway or the city train for tourists most likely arose as an individual production – the requirements on their windows and doors are correspondingly special – and therefore a "case" for us. And we dedicate ourselves to such tasks with the same quality requirements and love for detail as is used in the serial production of new vehicles.
With our spare parts, we are able to offer you the possibility to exchange defective parts – and thus also a complete refurbishment of your vehicle. These spare parts are often even better than the original, as they are partly newly constructed, comply with new norms or use better materials – e.g. with regard to fire protection. The Cleff spare part offer is particularly interesting, for example, for local transport operators, who want to impart “new life” into their vehicles. In the field of railway transport in particular, we are able to prolong the service life of the vehicle fleet – and for historical vehicles we even offer spare parts with a historical charm, which are, however, state of the art in terms of modern technology.
The offer comprises all types of rubber elements and gaskets, aluminium parts, handles, fittings and glass with attachments.
If you need individual spare parts for older vehicles or decide to refurbish and restore your vehicle fleet, then we are your partner to contact.
Currently, “AI” and Industry 4.0 are the focus of many discussions. At the Cleff company, we are also having a tendency toward more automation, but there are still regions of industry where clearly defined boundaries set the limits. We also encounter these limits, as our daily work is defined by a high level of manual craftsmanship – and this will continue to be the case. Window construction does not only need manual dexterity, but rather the right “feeling“ for materials and construction parts, which can only evolve after many years of working in window construction.
An example: Our staff in assembly bring window frames in the right form with exactly targeted blows with a hammer and can thus align frames with exact tolerances.
Only a few employees have this highly specialised ability after a lot of experience – and thus the above-mentioned “feeling” is only able to develop after many years of working in window construction. An ability, which even the most ingenious robots are not able to perform, even today …
The same also applies to construction: numerous developments are determined by creativity. Many vehicle doors require very individual solutions on account of the special installation situation and the high demands, e.g. on their pressure tightness. In this case, considerable constructive creativity is needed in order to provide acceptable results which can be implemented and keep the cost aspects in mind at the same time.
Individual developments, as they are offered by the Cleff company, always rely on the individual expertise of our staff in construction and assembly – and we are proud to have such talented employees and their individual abilities.
This is not just the epitome of engineering design and technical pioneering spirit, but also the landmark of Wuppertal since 1901: the Wuppertal suspension railway.
Enjoy a breath-taking view and a continuously changing view of the town when sitting in the bright blue carriages – through windows made by Cleff. After all, the entire functional glazing with the windscreen and rear window, side glass panes, flush window top-hung windows and partitions stem from our production, produced for the manufacturer of the “new suspension railway“: the company Vossloh-Kiepe/Stadler.
As a “ traditional Wuppertal manufacturer“ of vehicle glazing, we are naturally proud that our products now accompany the “Schwebebahn” on each journey it makes.
We wish the “Schwebebahn” and all who travel on it a pleasant trip … and enjoy the view!
You can find more about the history of the Wuppertal suspension railway and some of the interesting stories about it here:
In Wuppertal, we have also demonstrated a special closeness to Bauhaus and its world famous approach to design. The unusual commitment of the Wuppertal paint manufacturer Herberts, which already brought famous Bauhaus followers, such as Oskar Schlemmer, to Wuppertal is reflected in that both industry and schools of applied arts promised a lot from modern design.
And finally, the Cleff company also stands for the tradition of good design in Wuppertal: we already sponsored a design competition in collaboration with the Bergisch University and Polytechnic in Wuppertal in the 1980’s. Good design is an important component of numerous developments at Cleff today, e.g. the aesthetics of a window or a door have to comply with the overall design requirements of the complete vehicle. Similarly, there is a lot to consider at the human/functional interface: for example, windows and door handles are subject to the high requirements of user-friendly ergonomics and the lay understanding of function – which may even be of life-saving significance.
However, product design can provide even more than this: through creative ideas, it could allow material savings and simplified production processes – which means a reduction in costs.
For this reason, we integrate from the outset experienced designers with many of these developments. They provide „fresh wind", query the basic processes and help to counteract operational blindness under certain circumstances.
100 years of Bauhaus is therefore an anniversary to remember - because even today we are still able to take advantage of the fundamental principles of Bauhaus.
We thank you very much for the numerous visits at our booth on the InnoTrans 2018 in Berlin and the many inspiring discussions with our customers and suppliers.
We look forward to the next time in 2020.
The Team of Carl Wilhelm Cleff GmbH & Co KG
We have been analysing, designing and programming for a long time and now, it is done: Our new web presence is going online! The new version features many alterations and advantages. So, it eases the precise dsicovery of projects for example and it brings our team to the fore. Furthermore, we are now able to picture many references easily. The design studio „Design Scholemann“, located in Gevelsberg, supported us for this project. They will also attend us in all further matters concerning the public image.
At the end of 2017, we introduced an environmental management according to DIN EN 14001. To date, we have been certified within the program of Öko-Profit which is now being replaced by DIN EN 14001. We at Carl Wilhelm Cleff are comitted to improving the standards for the environment protection as well as for our employees by introducing the DIN EN 14001. Please find the corresponding certificate under the category „Download“.
It has been a long time since Tuffi & co – and the characteristical orange waggons oft he Schwebebahn (an overhead railway) were as old as they were. Therefore, the municpal utilities of Wuppertal urgently needed some replacement. The sky blue waggons are in fact produced in Valencia, Spain but important components of the elegant design are produced in the hometown of the Schwebebahn: The frameless windows are produced at Carl Wilhelm Cleff. The local journals have reported about this – read more: link