Depth gauge for diver

Claim 1

A depth gauge for use by a diver comprising: a hollow rubber case open at one end and having a rubber strap integrally molded to opposite sides of the rubber case adjacent the base of said case; said strap being resilient and stretchable and adapted to snugly fit upon a diver''s wrist; said base having a cavity with an opening communicating with the interior of the case; a flexible diaphragm overlying and sealing the cavity opening; a support plate positioned above said diaphragm and cooperating with said case and said diagraphm to define a first oil filled chamber; a block member positioned upon said base plate and having a passageway; a Bourdon tube having an inlet opening communicating with one end of the passageway in said block member; said support plate having an opening communicating with the opposite end of said passageway to admit oil into or withdraw oil from said tube as said diaphragm alters its contour and hence alters the volume of said first chamber due to changes in the ambient pressure surrounding the case; pivotally mounted pointer means and means coupled between said pointer means and said tube for pivoting said pointer means as the free end of said tube moves responsive to oil entering or leaving said tube; a transparent pressure glass covering the open end of said case and means for securing and water-tightly sealing said glass to said case; said pointer means being positioned beneath said glass and including a graduated dial face cooperating with a pointer; the exterior of said base engaging the wrist of the diver and having substantially radially aligned grooves extending between said cavity and the perimeter of said case to provide conduits to facilitate communication of the fluid medium external to said case with said diaphragm; said diaphragm being displaced inwardLy from the exterior surface of said base to prevent the diaphragm from engaging the diver''s wrist.