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Nowadays escalator has become a regular part of our lives. This time we introduce our research giving attention to the hand rail of escalator. A hand rail is usually made of three main parts which are 'Cover made of urethane to shape forms', 'Tensile carrier made of steel to provide tensile strength' and 'Sliding layer made of cloth to decrease friction between a hand rail guide and a hand rail. The purpose of this research is to develop an analytical model of the hand rail which is able to reproduce buckling when the hand rail is bended in under side direction. At first we tried bending tests making simple test pieces, because the hand rail has a complicated structure. Based on the test results, we developed an analytical model which includes suitable material parameters and elements. Next, we tried buckling tests and found that the initial form of the hand rail influences buckling dramatically making a comparison between tests and simulations. So we improved our analytical model considered the initial form. Finally we could confirm consistency between the experiments and the simulations reproducing buckling.

This paper describes about the method for detecting chain elongation.,the chain system is widely used for power transmission device. Commonly,It is known that if the chain enlongates ,the position of the chain-rollers in the sprocket tooth move to tooth tip. And the most papers show that if the chain have a uniformity enlongation over the whole length, all chain-roller in the sprocket tooth move the same amount. On this time , we look into the structural feature of the chain , and we verify the videograph of the camera fixed at position of specific tooth on the sprocket, so we can elucidate the next two characteristics. (1)if the chain enlongetes, the link enlongates on every other link. (2) if the chain enlongetes,on the sproket the tooth that chain-roller is on the pitch circle exists certainly. With these as assumption, we verify the engagement condition of chain-roller and sprocket tooth in the geometrical techniques with CAD. As a result, we confirm that if the chain enlongetes, the different of engagement hight between the neighboring chain-rollers and this different correlates with the elongation amount. We develope the enlongation amount measuring method, and verified the effect of this method with the experiment.

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