guard pin

American  

noun

Horology.

1. (in a lever escapement) a pin on the lever, meeting the safety roller in such a way as to prevent the lever from overbanking.

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Etymology

Origin of guard pin

First recorded in 1875–80

Example Sentences

The remaining part of the safety action is the guard pin shown at N Figs.

From Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology by Anonymous

The position of the guard pin should be as close to the bottom of the slot of the fork as possible and be safe.

From Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology by Anonymous

When describing Fig. 24, we gave instructions for finding the dimensions of crescent and position of guard pin for the single roller.

From An Analysis of the Lever Escapement by Playtner, H. R.

Several letters were delicately cut on its golden stem, and a guard pin showed how much its wearer valued it.

From A Garland for Girls by Alcott, Louisa May

When drawing a fork and roller action it is safe to show the guard pin as if in actual contact with the roller.

From Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology by Anonymous