Abstract: An improvement in a clasp for personal ornaments comprising a hook-shaped main body and a closing piece biased by means of a spring so as to close an opening thereof, the closing piece having one end to serve as a closing portion and the other end serving as an operating portion for the closing piece. The closing piece is provided at its base portion with an engaging portion and a locking member which engages the engaging portion at a position where the closing piece is pushed opened to maintain that position.

Abstract: A hatch locking mechanism is disclosed for a battery compartment having a mouth opening in the rear side of a wristwatch. The mechanism includes an inner cover adapted to be received within the battery compartment mouth and a central support shaft extending outwardly therefrom. An outer cover is slidably mounted around the support shaft and adapted to overlie the inner cover and battery compartment mouth. A first resilient seal member is disposed between the outer periphery of the inner cover and battery compartment mouth, and a second resilient seal member is disposed between the covers adjacent the support shaft. A lever pivotally connected to the support shaft is operable to bias the covers together and the seal members into sealing engagement when moved to a locking position to secure the hatch locking mechanism to the wristwatch and close the mouth of the battery compartment.