Mechanical pressure unit for attachment to wristwatch parts, comprises central cylinder containing sprung piston which operates bearing pressure point, threaded cylinder surrounds and fixing ring

摘要

The mechanical pressure unit consists of a central spring loaded piston with a metallic head (1b) bearing a pressure point made from semi-rigid material the piston being housed within a threaded cylinder (2) and surround (14A.B). The unit may be secured to the wristwatch clasp (23) by a threaded ring screwed to the cylinder end or alternatively to the watchcase or strap