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

See Examples For:

guard pin

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

Among these causes that of Poor Motion covers a number of troubles such as roller jewel rubbing in fork, guard pin rubbing roller, strong lock on the escapement, or no lock on some teeth.

From Rules and Practice for Adjusting Watches by Kleinlein, Walter J.

In reply we would offer the supposition that some workman had bent the guard pin forward or set a pallet stone too far out.

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 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