Liquid supplying system including tank and liquid bottle connectable to the tank

A liquid supplying system comprising:

• a plurality of tanks;
• and
• a plurality of liquid bottles provided in one-to-one correspondence with the plurality of tanks, each of the plurality of liquid bottles being attachable to a corresponding one of the plurality of tanks,
• each of the plurality of tanks comprising:
• a casing defining therein a storage chamber for storing a liquid therein;
• an air communicating portion formed in the casing and having an air communication opening through which air is allowed to communicate between the storage chamber and an atmosphere;
• a first tubular portion having an inner end positioned inside the storage chamber and an outer end positioned outside of the storage chamber, the inner end being an open end and positioned lower than a part of the air communicating portion, the outer end being an open end to allow the storage chamber to communicate with an outside of the tank;
• a second tubular portion having an inner end positioned inside the storage chamber and an outer end positioned outside of the storage chamber, the inner end being an open end and positioned lower than the part of the air communicating portion, the outer end being an open end to allow the storage chamber to communicate with the outside of the tank;
• and
• a sleeve portion extending in a predetermined direction to define a center axis extending in the predetermined direction, the first tubular portion and the second tubular portion being positioned inside an outermost profile of the sleeve portion in a cross-section of the sleeve portion taken along a plane perpendicular to the center axis of the sleeve portion, the sleeve portion having a peripheral surface formed with a first screw portion,
• each of the plurality of liquid bottles comprising:
• an outer wall defining therein an internal space for storing liquid;
• and
• an outer sleeve connectable to corresponding one of the sleeve portions and providing communication between the internal space and an outside of the outer wall, the outer sleeve defining an axis extending in an axial direction and having a peripheral surface formed with a second screw portion threadingly engageable with the first screw portion in a process to connect the outer sleeve to the sleeve portion,
• wherein a plurality of the first screw portions provide thread pitches different from one another, and
• wherein a plurality of the second screw portions provide thread pitches different from one another.

A liquid supplying system comprising:

• a tank comprising:
• a casing defining therein a storage chamber for storing a liquid therein;
• and
• an air communicating portion formed in the casing and having an air communication opening through which air is allowed to communicate between the storage chamber and an atmosphere;
• a first tubular portion having an inner end positioned inside the storage chamber and an outer end positioned outside of the storage chamber, the inner end being an open end and positioned lower than a part of the air communicating portion, the outer end being an open end to allow the storage chamber to communicate with an outside of the tank;
• a second tubular portion having an inner end positioned inside the storage chamber and an outer end positioned outside of the storage chamber, the inner end being an open end and positioned lower than the part of the air communicating portion, the outer end being an open end to allow the storage chamber to communicate with the outside of the tank;
• a sleeve portion provided at the tank and extending in a predetermined direction to define a center axis extending in the predetermined direction, the first tubular portion and the second tubular portion being positioned inside an outermost profile of the sleeve portion in a cross-section of the sleeve portion taken along a plane perpendicular to the center axis of the sleeve portion, the sleeve portion having a peripheral surface formed with a screw portion and a first engagement portion, the first engagement portion being a concave portion;
• and
• a liquid bottle comprising;
• an outer wall defining therein an internal space for storing the liquid;
• and
• an outer sleeve connectable to the sleeve portion and providing communication between the internal space and an outside of the outer wall, the outer sleeve defining an axis extending in an axial direction and having a peripheral surface formed with a second engagement portion engageable with the first engagement portion and the screw portion, the second engagement portion being a convex portion, the second engagement portion being guided by the first engagement portion to move in a direction parallel to the center axis of the sleeve portion in a process to connect the outer sleeve to the sleeve portion,
• wherein the first engagement portion is formed in one of turns constituting a thread of the screw portion, the one of the turns being positioned closest to a tip end of the sleeve portion, and
• wherein the second engagement portion has a length not more than a pitch of a thread of the screw portion in the direction parallel to the center axis of the sleeve portion.