Patent ID: 6991395

Claim:
A pen with an improved ink control mechanism comprising: a pen body with an empty cavity internal thereof, said cavity suitable for containing supplied ink, said pen body having a wall surrounding said cavity, said wall being flexible and suitable for being pinched so as to apply pressure to said cavity; a pen point affixed to an end of said pen body, said pen point being hydraulically conductive so as to deliver ink therefrom; an ink supply passage joining an inner end of said pen point to said cavity; and a pressure-driven control valve comprising a stopper end and an elastic part, said elastic part pushing said stopper end so as to meet a narrow opening in said ink supply passage so as to prevent ink from flowing outwardly therefrom, said stopper end separate from said narrow opening when said pen body has pressure applied thereto so as to allow ink to flow downwardly from said ink supply passage to said pen point, said stopper end is a two-section step-type column, said elastic part being of a zigzag sheet shape.