FIELD: physics.
SUBSTANCE: shock-proof mechanism (1) for the adjustment clock mechanism (100) comprising a balance spring (2) with a strip (20) wound with a number of turns (3); the inner turn (4) is fastened to the sleeve (6) having a common axis with the aforementioned balance spring (2) with respect to the rotary axis (D), and the outer turn (5) is fixed to the fixing element (7). At least, one turn (3) of the balance spring (2) includes, at least, one finger (8) connected with this turn (3) and moving without any contact during nominal stretching or compressing the balance spring (2) in the movement restriction groove (10) contained in the flange (11) of the mechanism (1), and this groove (10) is designed to restrict the finger movement (8) relative to the rotary axis (D), when the sleeve rotation angle (6) exceeds the predetermined nominal value.
EFFECT: increasing the reliability.
14 cl, 14 dwg
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