Writing pen with space behind nib

Claim 1

A writing pen wherein a valve element is operated to supply a writing nib in a pen holder with ink from an ink reservoir, the improvement comprising: a holder formed with a small bore in its front end and a large bore in its rear end, said bores in communication with each other and axially aligned; said writing nib formed of synthetic resin having an outer diameter of not more than 2 mm and having an axially extending ink passage bored through its interior, said small bore supporting said writing nib with the tip thereof protruding therefrom; and an ink guide stem between said writing nib and said valve element, said ink guide stem formed of porous resin-treated fiber material and adapted to receive the ink flowing from said ink reservoir and to supply said ink to said writing nib by capillary action, said large bore supporting said ink guide stem which extends rearward from said holder, said ink guide stem being formed with a recess at its front end, said recess extending in an axial direction of said ink guide stem and having an inner diameter substantially equal to an outer diameter of said writing nib to receive the rear end portion of said writing nib, said recess providing a small ink-retaining space defined between the rear end face of said writing nib and said ink guide stem for temporarily retaining therein a small amount of ink that exceeds the ink retaining capacity of said ink guide stem.