====== Oscillating pinion ======
{{wst>image_l|Schwingtrieb|Design drawing for applying the\\ **oscillating pinion** (see "T")|260px}}
The **oscillating pinion** was invented by [[Heuer, Edouard|Edouard Heuer]], the founder of the watch company [[Heuer]] (today [[TAG Heuer]]).

The oscillating pinion is an effective module used in [[chronograph]]s. It consists of a movable [[shaft]] mounted with two sprockets. The one [[pinion]] is in constant engagement with the [[second wheel]] of the [[watch movement]], while the opposite after pressing the start [[pusher]] after a short swing grips into the [[chronograph]] center wheel. By this the connection is established, and the [[chronograph]] is running. By pressing another button the oscillating pinion is again moved away from the center wheel, and the [[Chronograph]] stops.

For this development, the authority of the Paris 'Bureau for Industrial Property' issued a patent on May 3, [[1887]]. This principle finds application till the present day, for example, in the known and most widely used [[self-winding]] [[chronograph]] movement [[Valjoux 7750]].


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