Passive variable friction pen
AssigneeSociete BIC
InventorsDavid Duffy, Bernadette Elliott-Bowman
Life of this patent
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Abstract
A writing instrument configured to apply a writing material or liquid to a surface, comprising a socket, and a ball arranged in the socket, characterized by at least one first component which is arranged to come into contact with the ball, wherein the at least one first component comprises a first material having surface properties such that the friction coefficient between the ball and the at least one first component decreases when the force acting from the ball on the at least one first component increases at least within a certain range of forces.
Claims20
A writing instrument configured to apply a writing material or liquid to a surface, comprising a socket, and a ball arranged in the socket,
- characterized by at least one first component which is arranged to come into contact with the ball, wherein the at least one first component comprises a first material having surface properties such that the friction coefficient between the ball and the at least one first component decreases when the force acting from the ball on the at least one first component increases at least within a certain range of forces.
A writing instrument configured to apply a writing material or liquid to a surface, comprising a socket, and a ball arranged in the socket,
- characterized by at least one first component in contact with the ball, wherein within at least one certain range of forces, the dynamic force acting between the ball and the at least one first component decreases when the force acting from the ball on the at least one component increases, while having a relative movement from the ball surface with respect to the at least one first component.
Dependencies are inferred from the claim text.