Writing implement

A writing implement comprising:

• a pen tip;
• an ink tank that directly retains ink;
• an ink retention member that includes the pen tip at a front-end portion thereof, is provided on a front side of the ink tank, and temporarily retains overflow ink accompanying an increase in pressure inside the ink tank;
• and
• an ink guiding member that is provided inside the ink retention member and supplies the ink from the ink tank to the pen tip,
• wherein the ink retention member includes:
• a plurality of plate-shaped comb teeth formed at intervals on an outer surface thereof;
• a plurality of ink retention grooves that are formed between the comb teeth and temporarily retain the ink;
• an axially extending slit-shaped ink guiding groove that communicates with the ink tank and communicates with each of the ink retention grooves;
• and
• an inner hole that is provided to extend in an axial direction and has the ink guiding member provided therein,
• the ink retention member includes a horizontal hole that opens radially outward and communicates with the inner hole,
• the horizontal hole and the ink guiding groove are formed not to communicate with each other in a transverse cross-section,
• the horizontal hole is provided to penetrate at least one comb tooth of the comb teeth in the axial direction and communicates with the ink retention grooves adjacent to the comb tooth,
• wherein the horizontal hole includes:
• an inner opening portion that opens into the inner hole;
• an outer opening portion that opens radially outward and communicates with the inner opening portion;
• and
• a step portion that is disposed between the inner opening portion and the outer opening portion and faces radially outward,
• wherein a dimension in a width direction of the outer opening portion is greater than a dimension in a width direction of the inner opening portion.

A writing implement comprising:

• a pen tip;
• an ink tank that directly retains ink;
• an ink retention member that includes the pen tip at a front-end portion thereof, is provided on a front side of the ink tank, and temporarily retains overflow ink accompanying an increase in pressure inside the ink tank;
• and
• an ink guiding member that is provided inside the ink retention member and supplies the ink from the ink tank to the pen tip,
• wherein the ink retention member includes:
• a plurality of plate-shaped comb teeth formed at intervals on an outer surface thereof,
• a plurality of ink retention grooves that are formed between the comb teeth and temporarily retain the ink;
• an axially extending slit-shaped ink guiding groove that communicates with the ink tank and communicates with each of the ink retention grooves;
• and
• an inner hole that is provided to extend in an axial direction and has the ink guiding member provided therein,
• the ink retention member includes a horizontal hole that opens radially outward and communicates with the inner hole,
• the horizontal hole and the ink guiding groove are formed not to communicate with each other in a transverse cross-section, and
• the horizontal hole includes:
• an inner opening portion that opens into the inner hole;
• an outer opening portion that opens radially outward and communicates with the inner opening portion;
• and
• a step portion that is disposed between the inner opening portion and the outer opening portion and faces radially outward,
• wherein a dimension in a width direction of the outer opening portion is greater than a dimension in a width direction of the inner opening portion.