Brush flatter and drawing instrument equipped with brush flatter

A drawing instrument comprising:

• a shaft having a tip portion;
• a brush member mounted on the tip portion of the shaft and having fibers extending in an axial direction of the shaft from the tip portion of the shaft;
• and
• a brush flatter made of an elastic material and including:
• a casing having a space to allow the brush member of the drawing instrument to pass in the axial direction of the shaft;
• a shaft fitting portion formed at a proximal end portion of the casing, the shaft fitting portion having such a configuration as to fittingly seat on the tip portion of the shaft of the drawing instrument, and the shaft fitting portion of the brush flatter includes an inner surface having a projection configured for engaging an outer circumferential surface of the tip portion of the shaft when the shaft fitting portion fits on the tip portion of the shaft;
• and
• a brush pressing portion formed at a distal end portion of the casing, the brush pressing portion defining a slit-like opening through which a tip portion of the brush member pressedly passes so that an exposed tip portion of the brush member shapes into a flat form when the shaft fitting portion of the casing fittingly seats on the tip portion of the shaft of the drawing instrument, the brush pressing portion having a side wall extending in parallel with the axial direction of the shaft to align the fibers of the brush member.

A drawing instrument comprising:

• a shaft having a main body with a diameter and a radius and a tip portion having a radius smaller than the radius of the main body;
• a brush member mounted on the tip portion of the shaft and extending in an axial direction of the shaft from the tip portion of the shaft;
• and
• a brush flatter to be detachably coupled with the shaft, the brush flatter including:
• a casing having a space to allow the brush member of the drawing instrument to pass in an axial direction of the shaft;
• a shaft fitting portion formed at a proximal end portion of the casing, the shaft fitting portion having a diameter that is substantially equal to the diameter of the main body of the shaft and the shaft fitting portion having a thickness that is substantially equal to a difference of the radiuses of the main body and the tip portion of the shaft;
• and
• a brush pressing portion formed at a distal end portion of the casing, the brush pressing portion defining a slit-like opening through which a tip portion of the brush member pressedly passes so that an exposed tip portion of the brush member shapes into a flat form when the shaft fitting portion of the casing fittingly seats on the tip portion of the shaft of the drawing instrument.