Pendulum clock mechanism
This clock is operated by weights that, under gravity, drive the hands of the clock in their rotational movement by means of a gear train.
drumCylinder around which the weights’ cord or chain winds when the clock is rewound.
weightHeavy body that hangs from the main wheel; its descent provides the necessary energy for the clock’s mechanism.
ratchet wheelToothed wheel having only one direction of rotation; it is kept in place by the click.
main wheelFirst wheel in the gear train that transmits the driving force of the weights to the other wheels to turn them.
pendulum bobWeight attached to the end of the pendulum rod.
clickSmall lever that is engaged between the ratchet-wheel teeth and prevents it from rotating counter to its normal direction.
pendulum rodRigid bar to which the pendulum bob is attached.
center wheelWheel that is connected to the hands and causes them to rotate on the dial.
forkPart that is operated by the escape wheel to cause the pendulum’s movement.
pinionSmall wheel with teeth that is mounted on a shaft and transmits the rotational movement of one wheel to another.
suspension springSmall rigid plate from which the pendulum hangs.
palletAnchor-shaped part that frees and constrains the escape wheel’s teeth to maintain the pendulum’s back-and-forth movement.
winding mechanismDevice that raises the weights to start anew the cycle of the clock’s mechanism.
hour handMetal needle that points at the 24 hours of a day on the dial.
minute handMetal needle that points at the 60 minutes of an hour on the dial.
third wheelWheel that receives energy from the center wheel and drives the escape wheel.
spindleCylindrical part that transfers the rotational movement of one part to another.
escape wheelLast wheel of the gear train with special teeth that causes the clock to operate regularly and continuously and controls the movement of the other wheels.
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Pendulum Clock Mechanism Close-Up