Ball-point for roller-type pens comprises capillaries for drawing a water-based ink and a spring for pressing the ball against the edge of the point
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Ballpoint for pen comprises a coil spring and protrusions for maintaining a uniform contact between the point and the ball
US2006115318A1
Ball-point pen with means of preventing inclination of the straight portion of the ball-pressing spring
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Ballpoint pen nib provided with a stem with communication flutes
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Ballpoint pen nib provided with a stem with communication flutes
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Ballpoint pen has capillary channel with cylindrical narrow section which on coming in contact with straight portion of spring, prevents it from being inclined with respect to longitudinal axis of pen
EP1587693A1
Ballpoint pen nib provided with a stem with communication flutes
