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guard pin

noun, Horology.
(in a lever escapement) a pin on the lever, meeting the safety roller in such a way as to prevent the lever from overbanking.
Origin of guard pin
First recorded in 1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for guard pin
Historical Examples
  • 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.

  • When the lock, drop and draw are correct it is next necessary to see that the fork length and guard pin freedom are correct.

  • See that jewel pin reaches fork properly and that the guard pin also reaches 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
  • The remaining part of the safety action is the guard pin shown at N Figs. 61 and 62, which is placed in the lever.

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

  • As to the size of the guard pin, it is usual to make it about one-third or half the diameter of the jewel pin.

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

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

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