Ansonia Iron Case Mantel Clock with Small Round Movement

September 27, 2009 | By | Reply More

I recently repaired this Ansonia mantel clock. The case is cast iron with black finish and enamel dial. It is 9 5/8 inches tall, and 11 inches wide at the feet.

The round 8 day movement is 3 1/4 inches in diameter with open mainsprings. It has rack and snail strike on the hour and half-hour. It has a strip recoil escapement.

I did not do a complete repair job on this movement, per customer request.  I cleaned it and replaced the strike click, which had failed. I also replaced the time mainspring, as the existing one was providing at least twice the necessary torque (it was not original). It was 7/16 x 0.018 by 60 inches, and I replaced it with 3/8 x 0.014 by 60″. A longer and thinner spring would have been even better, but not readily available.

The original strike spring is only 0.0125″ thick and is 7/16 inch wide, and 8 feet long. The original time mainspring was probably similar.

Here are movies of the rack and snail strike mechanism and the escapement.

Here is a slideshow.

Repair job 4990.


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Category: American Clock Mainsprings, American Clock Repair

Last updated: November 20, 2009

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