Patent ID: 6435747
Filing Date: 2002-08-20
Classification: B43K

Abstract:
A double ended direct-feed type writing implement comprising:an ink tank; a pair of writing points as writing elements, arranged at opposite ends of the ink tank; an ink collector provided for each writing point and having an air/liquid exchanger for adjusting the internal pressure inside the ink tank by making use of capillarity; an ink feeder means, provided for each writing point, and including a center core for feeding ink to the writing point; an ink tank partitioning element, formed inside the ink tank and each center core extends to an ink storage pool created by the ink tank partitioning element, and the ink tank partitioning element defines a plurality of channels between itself and a barrel of the writing implement defining the ink tank, whereby ink can flow through these channels; and means for inhibiting air from flowing into the ink tank through the ink collector air/liquid exchanger located at one end while the pen is being used for writing at the opposite end.