Cooling apparatus for a gas transmission system

Improved cooling apparatus for a gas transmission system, including:

• input means for receiving a medium to be cooled;
• output means for transmitting said medium after it is cooled;
• and,
• cooling means intercoupling said input means and said output means, said cooling means including radiator means having an input end and an output end, said input end of said radiator means being connected to said input means and said output end of said radiator means being connected to said output means;
• said cooling means including, in addition, fan means positioned to cooperate with said radiator means for producing a flow of cooling air across said radiator means;
• said fan means including a rotatable fan having a desired direction of rotation, a drive-motor for driving said fan in said desired direction and belt means intercoupling said drive-motor and said rotatable fan for rotation of said fan;
• said belt means including a belt having, alternatively, a taut state and a slack state, and adjustable belt-tensioning means including a frame and being mechanically coupled to said belt for tensioning said belt between said taut state and said slack state, said adjustable belt-tensioning means including a sheave in rotating contact with said belt, a shaft having first and second ends, carrying said sheave at the first end thereof, and positioned in said frame substantially parallel to the plane of said belt and spaced from said belt an adjustable distance corresponding to the condition desired for said belt between said taut state and said slack state;
• a sprag-clutch having a first race fixedly connected to said frame and a unidirectionally rotatable second race coupled to said second end of said shaft, said second race having a direction of rotation relative to said first race which corresponds to said desired direction of rotation of said fan.