Henry A. Frost of Worcester, Massachusetts was granted letters patent for his apple parer on August 6, 1861 (Frost, 1861). Frost is listed as assignor to Henry Sargent Whittemore and David Henshaw Whittemore. Frost's design was sold as Whittemore Brothers Return Table Apple Parer.
Frost's return table design consists of a face cam. The paring knife assembly is secured to the top of the cam at a pivot point and includes a groove within which a constrained follower moves. The groove ensures that their is no need for a return spring. Some examples of this parer are marked on the frame while others like the one pictured below are marked along the inner drive gear (Thornton, 1997).
The teeth on the drive and fork spur gear of the apple parer used for this video do not stay fully enganged through its operation, not suprising for a kitchen tool over 155 years old. Great care must be taken to avoid breaking gear teeth in this kind of situation. I do not use this parer for regular demonstrations.
Frost, H. A., inventor, Apple-Parer, 1861 Aug. 6. US33016.
Thornton, D. 1997. Apple Parers. Sunnyvale, California: Off Beat Books, p. 173.