Patent ID: 6158971
Filing Date: 2000-12-12
Classification: F04B

Abstract:
A decompression pump comprising:a motor;a crank base constructed and arranged to rotate around an output shaft of said motor;a driving shaft attached to said crank base in a condition inclined relative to said output shaft;a driving body rotatably attached to said driving shaft;at least one connecting rod attached to said driving body;a piston attached to said at least one connecting rod;a housing having at least one pump chamber;a diaphragm constructed and arranged to maintain said at least one pump chamber in an airtight condition, said diaphragm being arranged between said connecting rod and said piston;a check valve;an exhaust port communicating with said at least one pump chamber by way of said check valve; andan inlet port communicating with said at least one pump chamber by way of said check valve;wherein said diaphragm has a substantially planar plate form and has a curved portion which is provided around said piston so as to be adjacent to said piston.