Shock absorbing device with angular locking

A shock absorbing device for an arbor of a wheel set of a micromechanical device, said shock absorbing device comprising:

• a pivot module,
• a support provided with a housing accommodating the pivot module, the support being surmounted by a peripheral shoulder extending from a rim of the housing towards the center of the support, said peripheral shoulder comprising a plurality of recesses opening onto the housing with at least one of said recesses forming a locking recess,
• a spring ring configured to adopt respectively a mounting position and an attachment position with respect to the support, said spring ring being arranged between the peripheral shoulder and the pivot module in order to exert an elastic force on said pivot module when the spring ring is in the attachment position, said spring ring being provided on an outer periphery thereof with a plurality of tabs with at least one of said tabs forming a locking tab, the plurality of tabs extending radially away from the center of the support and giving the spring ring an outer diameter which exceeds an inner diameter of the peripheral shoulder, the plurality of tabs cooperating with the peripheral shoulder during a mounting and bayonet attachment of the spring ring to the support, the recesses of the support having dimensions at least equal to dimensions of the tabs to allow engagement of the tabs in corresponding recesses during the mounting, wherein
• a number of recesses is greater than a number of tabs with at least one extra recess forming the locking recess, and
• in the attachment position, one part of the tabs is positioned under the peripheral shoulder and another part comprising at least said locking tab is positioned in said locking recess, said locking recess being surrounded on each side by a tab positioned under the peripheral shoulder, each tab positioned under the peripheral shoulder being subjected to a force applied by said peripheral shoulder, said force causing a curved deformation of a section of the peripheral shoulder extending between the tabs positioned under the peripheral shoulder, the deformation of the locking tab disposed on said section allowing the spring ring to be locked in the attached position thereof.