Abstract
The paper presents the method of geometrical synthesis of two new kinematic schemes of articulated planar mechanisms used to actuate the urban bus doors. The stages of solving geometrical synthesis for the two and three relative-associated positions of the bars articulated to the body are performed. In order to optimize the geometric synthesis and to avoid the mechanism stalling, the limiting of the pressure angle is required. One of the two proposed mechanisms has kinematic chains of dyad type in its structure, and the other mechanism also includes a triad-type kinematic chain. The new solutions have a smaller swept volume regarding the control mechanism.
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