Patent ID: 6202559
Filing Date: 2001-03-20
Classification: F42C

Abstract:
A mechanical device for generating actuating movement, comprising:a housing defining a first bore and a second bore contiguous and coaxial with said first bore, said second bore having a smaller diameter than said first bore, said housing further defining at least one radial port allowing an environment about said housing to communicate with said first bore;a first piston slidably mounted in said first bore;a second piston slidably mounted in said second bore and positioned flush with said first bore; anda spring coupled to said first piston and capable of an at-rest state in which said first piston is positioned in said first bore to seal off said at least one radial port while being spaced apart from said second piston, said spring further capable of a compressed state in which said first piston is positioned such that said at least one radial port communicates with said first bore between said first piston and said second piston wherein, when said housing is submerged in an incompressible fluid and said spring is in said compressed state, said at least one radial port admits said fluid into said first bore so that when said spring is released from said compressed state and allowed to transition to said at-rest state, said first piston moves in said first bore to seal off said at least one radial port and subsequently pressurize said fluid in said first bore between said first piston and said second piston to drive said second piston along said second bore as said actuating movement.