Oil gauge for cartridge-type oil tank

An oil gauge for a cartridge-type oil tank which is arranged in said cartridge-type oil tank through an opening formed at a substantially central portion of a side wall of said cartridge-type oil tank to quantitatively indicate the amount of oil in said cartridge-type oil tank, comprising:

• a transparent cover plate arranged on said side wall of said oil tank so as to airtightly cover said opening of said cartridge-type oil tank;
• a gauge base mounted on an inside of said cover plate;
• an arm rod pivotally mounted at a proximal end thereof on said gauge base and provided at a distal end thereof with a float, so that it may be pivotally moved through said float depending on a variation in a level of oil in said cartridge-type oil tank;
• an oil indicator having a pendulum-like shape and comprising a rod pivotally mounted at a proximal end thereof on said gauge base and an indicator body of an arcuate shape mounted on a distal end of said rod and provided on an outer surface thereof with a scale for quantitatively indicating the amount of oil in said cartridge-type oil tank depending on a level of oil in said cartridge-type oil tank;
• and,
• a pair of stoppers provided on opposite sides of a portion of said arm rod adjacent to said proximal end thereof;
• said rod of said oil indicator being interposed at a portion thereof adjacent to said proximal end thereof between said stoppers such that one of said stoppers engages said rod of said oil indicator to pivotally vary a position of said oil indicator depending on a variation in the level of oil in said cartridge-type oil tank when said oil tank is in a working position and the other of said stoppers engages said rod of said oil indicator to pivotally vary the position of said oil indicator depending on a variation in the level of the oil when said oil tank is in an oil feed position which is inverted relative to said working position, such that said indication means indicates a corresponding level of oil in said oil tank irrespective of said positions of said oil tank.