Patent ID: 7307917
Filing Date: 2007-12-11
Classification: G04B

Abstract:
1. A mechanical device for displaying cycles of discrete values of a variable on a scale of N fields, the variable being able to take either N successive ordinary values in an ordinary cycle, or at least N+1 values, including said N ordinary values and at least one additional value, in an extraordinary cycle, said mechanical device including concentrically: an indicator wheel set, driven step by step to complete one revolution per ordinary cycle and per extraordinary cycle and provided with an indicator which is associated with said scale, the indicator wheel set having a plate carrying a toothed planetary wheel which is prevented from rotating on the plate by a restraining device, the planetary wheel further having stop elements uniformly distributed over its circumference, a drive wheel having a first toothing, arranged to be driven through 1/Nth of a revolution at the end of each cycle and a second toothing which meshes with that of the planetary wheel, and a rotating stop finger able to form a stop member for at least one of the stop elements of the planetary wheel and thus to rotate the wheel against the restraining device while the plate rotates; the device further including positioning means arranged for placing and holding the stop finger in a selected position corresponding to a field of said scale.