Patent ID: 6247907
Filing Date: 2001-06-19
Classification: F04C,F16F

Abstract:
A compressor comprising:a compressor pump unit mounted at one end;a motor for driving said compressor pump unit, said motor driving a shaft, said shaft being mounted to drive at least a portion of said compressor pump unit; anda counterweight mounted on said shaft, said counterweight being positioned between an upper edge of said motor and a lower edge of said compressor pump unit, said counterweight being relatively thin, and said counterweight having a neck portion mounted on said shaft, and an upper portion extending upwardly from said neck portion toward said compressor pump unit, said upper portion extending for less than 360.degree. of circumference about a rotational axis of said shaft, and said upper portion extending axially from said neck portion for a length that is more than two times the thickness of said upper portion.