Case Study

Better safety for employees - and optimum protection for the goods

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Transporting glass loads requires extreme caution. Especially when the loads take on the dimensions of a small bus.

This calls for transport trolleys that demonstrate outstanding manoeuvrability and guarantee the physical well-being of the employees. For renowned glass manufacturer and processor INTERPANE, we have therefore developed a foot protection system that represents the highest level of work safety and at the same time enables trouble-free transport of the glass panes.


The starting point

The One World Trade Center in New York, The Marq in Singapore and One One One Eagle Street in the heart of Brisbane, Australia, have one thing in common: Their façades are made of glazing from the INTERPANE Group. The company is a subsidiary of AGC Glass Europe, which belongs to the Japanese glass concern Asahi Glass Co. Ltd. The company employs 50,000 people worldwide.

INTERPANE’s product range includes float glass, low-iron glass, high-quality coated thermal insulation glass, soundproofing and solar control insulating glass, safety glass, glazing for architectural design, and products for solar applications.

The company supplies glass elements for regional and international large-scale construction projects as well as for the local window construction market.They also are one of the few manufacturers worldwide to produce coated glazing with remarkable sizes up to 18 meters in length, 3.21 meters in height and window pane thicknesses of up to 20 millimeters.

The challenge of protecting feet

INTERPANE attaches great importance to health and safety at work when manufacturing and refining its glass products. The company has announced a proactive, zero tolerance strategy. With this strategy, the glass manufacturer is pursuing its goal of preventing accidents at work, protecting the health of its employees in the long term and raising awareness of risks. All of the processes are planned and optimized accordingly, regular risk assessments are carried out and all accidents are analyzed in detail.


Naturally, this also applies to the transportation of the glass panes, some of which are up to 20 square meters in size. In order to ensure safe transportation during the production process, the raw glass is cut to size according to the customer's requirements and loaded onto transportation carts. Depending on the order, the panes can be up to about seven and a half meters long and around three meters high. Not to mention, their total weight can be up to 2.5 metric tons.

This presents a particular challenge in terms of operational safety. If the heavily loaded transportation carts move too quickly or get caught on obstacles or uneven surfaces, they can bump into the employees' ankles or run over their feet. In order to prevent injuries, INTERPANE has so far used two different foot protection systems, neither of which could meet the stringent safety requirements or cope with the conditions in practice: A rigid system was found to be suitable for transportation on level floors, but as soon as the carts hit unfavorable ground conditions, the foot protection soon came into contact with the ground. The result: Abrupt stopping or even tipping of the transportation carts.

The flexible protective device also posed a similar risk. This device could be drawn under the wheels and stop the casters. Both models thus posed a danger for employees and for the goods being transported.

The glass manufacturer therefore needed a foot protection system that would ensure maximum safety in accordance with the company's preventive strategy.


Our smart mobility solution.

In order to mitigate the acute danger, we reacted quickly by providing a robust metal foot guard, which also significantly improved the handling of the trolleys. At the same time, we started developing a completely new foot protection system to set new standards in safety and mobility for glass production and assembly.

Our aim was to achieve maximum flexibility for driving over uneven surfaces and other obstacles, while ensuring maximum stability, in order to prevent any contact between the foot and wheel. With this in mind, we developed a perfect combination of rigid steel elements and flexible natural rubber: In order to provide optimum protection for the employees, flexible aprons made of rubber with a Shore hardness of 80 are fitted in front of and behind the wheel of the transport trolley. The aprons are shaped in such a way that they are pressed in towards the wheel as soon as the wheel comes into contact with the foot. This prevents the castor from moving over and crushing the foot.

The second safety feature is based on rigid guard rails attached to the side of the wheel. These ensure that the foot is guided safely around the side of the wheel. Thanks to these two elements, the feet are well protected at every conceivable angle of contact. At the same time, all floor conditions can be overcome without difficulty – and the precious glass elements can be transported safely.

The solution fulfilled the company’s expectations to the fullest extent and was recommended by the INTERPANE Group’s safety coordinator for use in all of the factories.

For more than 30 years, we have been using TENTE's professional expertise.

Norbert Götz, Purchasing Manager at GEBHARDT

Perfectly adapted safety.

The new foot guard is available for wheels in four sizes, from 125 to 250 millimeters, and allows for quick and uncomplicated retrofitting.

During the development process, we also considered the thermal conditions that play a role in the production and assembly of glass elements, and indeed in almost all other areas of industrial production. 

So our mobility solution is suitable for use at minus 40 degrees Celsius and up to 80 degrees Celsius.

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TENTE Casters, Inc.

2266 Southpark Drive

Hebron KY 41048

United States

Phone: +1 859 586 5558