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Shock protection

Shock protection
of a wristwatch movement

The shock protection (or shock absorber) is an important part of any modern mechanical watch movement. The most common shock protection today is Incabloc, another well-known is Kif Flector.

The task

Elastically mounted jewel bearings of the balance staff ensure that their pivots don't break at hard pushes, e.g. when the watch falls down.

Explanation of the operation

The capstone a is under pressure of the spring b. For a vertical impact this jewel can lift as far as the stop c abuts a fixed part. To damp lateral shocks the jewel is mounted in a chuck that is provided with an inclined surface d, which allows a slight shift; this is limited by the shaft stopper e, which abuts against a fixed part of the frame.