(in a lever escapement) a pin on the lever, meeting the safety roller in such a way as to prevent the lever from overbanking.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use guard pin in a sentence
Be sure the guard pin does not interfere with the fork action in any way.
As a rule, all the guard pin needs is to be free and not touch the roller.
Several letters were delicately cut on its golden stem, and a guard pin showed how much its wearer valued it.A Garland for Girls | Louisa May Alcott
In reply we would offer the supposition that some workman had bent the guard pin forward or set a pallet stone too far out.
When drawing a fork and roller action it is safe to show the guard pin as if in actual contact with the roller.