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.

---

Etymology

Origin of guard pin

First recorded in 1875–80

Example Sentences

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.

Be sure the guard pin does not interfere with the fork action in any way.

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 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

In this action the guard pin i also acts as the impulse pin.

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

The function performed by the outer face of the prong of a fork is to prevent the engaged pallet from unlocking while the guard pin is opposite to the passing hollow.

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