Machine for Rough Cutting Precious, Semi-precious or Synthetic Stones or Imitations thereof.

摘要

103,925. Barker, R. W., (Heller & Sons, L.). May 16, 1916. Dash-pots.-A dash-pot forming part of the feeding-mechanism of a gem-cutting machine comprises a piston 25 formed with holes 31, normally closed by a valve 32, and with holes 35 leading to a channel 34. A well 30 communicates through holes 29, 29' with the cylinder 26 and the channel 34 respectively, the flow of oil being regulated by a valve 27. The piston rests on a returning-spring 33.