Liquid dispensing device with two different application heads at both ends respectively

A liquid dispensing device comprising:

• a container comprising a first space for containing a quantity of first liquid and having a projecting opening at one end, and a second space for containing a quantity of second liquid and having a projecting opening at one end wherein the first space and the second space do not communicate with each other;
• a first transmission assembly disposed in the opening of the first space and comprising a stepped diameter first sleeve, a first rotation ring fastened in the first sleeve, a first externally threaded pipe, and a first internally threaded plunger wherein one bare end of the first externally threaded pipe is partially retained in the first rotation ring, the first internally threaded plunger is engagement secured to the first externally threaded pipe, both the first sleeve and the first rotation ring are capable of co-rotating to turn the first externally threaded pipe, the first internally threaded plunger is sealingly engaged with an inner surface of the first space, and the first internally threaded plunger is capable of axially moving in the first space in a first predetermined range;
• a first dispensing assembly comprising a hollow, cylindrical mounting member, an elongated hollow first carrier, a first application head disposed at one end of the first carrier, and a first cap fittable to both the first sleeve and the first carrier wherein the mounting member comprises an inlet opening at one end and is disposed in both the first sleeve and the first carrier, and the first carrier is capable of axially moving in the mounting member in the first predetermined range;
• a second transmission assembly disposed in the opening of the second space and comprising a stepped diameter second sleeve, a second rotation ring fastened in the second sleeve, a second externally threaded pipe, and a second internally threaded plunger wherein one bare end of the second externally threaded pipe is partially retained in the second rotation ring, the second internally threaded plunger is engagement secured to the second externally threaded pipe, both the second sleeve and the second rotation ring are capable of co-rotating to turn the second externally threaded pipe, the second internally threaded plunger is sealingly engaged with an inner surface of the second space, and the second internally threaded plunger is capable of axially moving in the second space in a second predetermined range;
• and a second dispensing assembly comprising a hollow, stepped diameter second carrier, a tubular member, a second application head, an exterior case, and a second cap fittable to the second sleeve wherein the second carrier is disposed in the second sleeve, the tubular member is fastened in both the second carrier and the second application head, the second application head is engaged with the second carrier, the exterior case is lockingly put on the second application head and clamped between the second carrier and the second sleeve so that the second application head, the second carrier, the exterior case, and the second sleeve are fastened together.