Lever / Chronometer

The lever / chronometer escapement are types of escapement used in almost all mechanical watches as well as small mechanical non-pendulum clocks, alarm clocks, and kitchen timers. Gearotic offers them as a platform to help you build your ticking design.

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The lever and chronometer are a few types of escapment found in Gearotic. These include the recoil, Graham, and both the Chrono deadbeat and recoil. An escapement being a mechanical linkage that gives pushes to a wheel keeping it rotating back and forth, while each swing of the wheel allows a gear train to advance a fixed amount depending on your design.

The advantages of the lever is that it is a "detached" escapement. This allows the wheel to swing completely free of the escapement during most of its oscillation except when giving it a short impulse. Due to the "locking" and "draw" action, it is very precise and can be self-starting. The rotation of the escape wheel (deadbeat) is controlled by the pallet which is designed to work as a ratchet. This lever is mounted on a shaft and is free to rotate between two teeth of the deadbeat gear. At rest one of the deadbeat gear teeth will be locked against a pallet and when the escapment wheel rotates, the entrance tooth is locked in place against the pallet.

On chronometer styles, the impulse pin is located within the lever fork and the timing wheel near its center

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Lever / Chronometer

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position. The lever fork must receive a small impulse at first which will rotate the lever slightly off the left banking pin, thus unlocking the entrance pallet allowing the wheel to rotate. As the spring loaded escapement wheel rotates, the entrance tooth slides across the sloping impulse plane of the entrance pallet causing the pallet to rotate about its axis, which places the exit pallet into the path of the rotating escapement wheel. Once the entrance tooth leaves the impulse plane of the entrance pallet, the wheel is able to turn a small amount until the exit tooth of the escapment wheel lands on the locking face of the exit pallet. The lever moves until it rests against the pin and is held in this position by the force of the exit tooth against the exit pallet. This means that in order to unlock the wheel it must be turned backwards by a small amount which is done by the return momentum of the balance wheel via the impulse pin which repeats the cycle.

We have great respect for the pioneers behind all these mechanical devices especially if you ever attempted to build one yourself without this software! However, Geraotic puts it all into perspective so any user may quickly add one style for their own creation. Simulation can also be performed to visualize the operation. We hope you enjoy the simplified solutions Gearotic offers.

Chronometer Recoil Type

Click here to view our Lever/Chronometer 1 tutorial video on YouTube.

Click here to view our Lever/Chronometer 2 tutorial video on YouTube.