Patent ID: 7353932

Claim:
A travelator, moving ramp or escalator, comprising: a power machine; a conveyor having a driven end driven by the power machine, and a non-driven end, the conveyor comprising: a first drive element and a second drive element at a distance from and parallel to the first drive element, each drive element comprising an endless loop; a plurality of transport platforms arranged one after the other and secured to the first and second drive elements; a first driving pulley disposed at the driven end and over which the first drive element is passed, the first driving pulley being arranged to be rotated by the power machine; a first diverting pulley disposed at the non-driven end and over which the first drive element is passed; a second driving pulley disposed at the driven end and over which the second drive element is passed, the second driving pulley being arranged to be rotated by the power machine; a second diverting pulley disposed at the non-driven end and over which the second drive element is passed; a first synchronizing device arranged at the driven end for mutual synchronization of the first driving pulley and the second driving pulley; a second synchronizing device arranged at the non-driven end for mutual synchronization of the first diverting pulley and the second diverting pulley; and wherein the first synchronizing device at the driven end comprises: a first synchronizing shaft connected to the power machine for rotation; a third driving pulley mounted on the first synchronizing shaft; a third diverting pulley mounted on the same shaft with the first driving pulley; a third drive element comprising an endless loop passed over the third driving pulley and the third diverting pulley; a fourth driving pulley mounted on the first synchronizing shaft at a distance from the third driving pulley; a fourth diverting pulley mounted on the same shaft with the second driving pulley; and a fourth drive element comprising an endless loop passed over the fourth driving pulley and the fourth diverting pulley.