Back to results
US 3,940,888 AGranted
Faceting device for gemstones
OwnerHarry C. Waininventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerHarry C. Waininventor
Estimating the term…
A gemstone faceting machine for properly orienting a gemstone for forming facets thereon in a plurality of coaxial rows with equal spacing of the facets in the rows. A dop stick is provided on the end of a faceting shaft secured in a quill sleeve rotatably mounted in a faceting head (which can be angularly adjusted for different facet rows to be formed). A spring-biased detent trigger is pivoted on the bracket to engage between the teeth of an indexing gear secured on a collar on the quill sleeve near the other end of the shaft. A positioning pin is secured to the collar and projects through the gear. A guide disc having evenly spaced peripheral notches is engaged around and can be rotated on a flanged bushing threadably engaged on the quill sleeve adjacent the gear, and a coil spring is provided on the bushing, urging the disc toward the gear. The disc has respective holes spaced to receive the pin to establish the angular relationship between the successive rows of evenly spaced facets. The notches on the disc guide the detent trigger into engagement between the gear teeth for assuring uniform angular rotational steps of the shaft in forming the facets of a particular row.
A gemstone faceting holder comprising a support, an angularly adjustable bracket member on said support provided with angle-indicating means, a sleeve member rotatably mounted in said bracket member, dop stick means secured in said sleeve member, a peripherally toothed indexing gear secured on said sleeve member, a spring-biased trigger lever pivoted on said bracket member and being engageable with the toothed periphery of the gear to fix the position of said dop stick means, an indexing wheel rotatably mounted on the sleeve member and having evenly spaced peripheral guide notches for the trigger lever, interengaging locking means on the wheel and gear to interlock the wheel and gear in a plurality of different angular relations to each other, said interengageable locking means including a projection on the gear and angularly spaced receiving socket means on the wheel for receiving said projection at said different angular relations between the wheel and gear, and spring means urging the wheel into interlocking relation with the gear, the wheel being disengageable from the gear by lifting movement axially of the sleeve member against the bias of said spring means to vary the angular relation of the wheel and gear.
Dependencies are inferred from the claim text.