Liquid ink writing instrument with a shape memory valve

Details Liquid ink writing instrument with a shape memory valve Liquid ink writing instrument with a shape memory valve

B - Operations, Transporting

43

K

B43K 5/18 (2006.01)

Patent

CA 2435881

The liquid ink writing instrument of the invention has a body containing, from its rear end towards its front end, a reservoir for the ink and a front chamber containing a capillary element for transferring ink coming from the reservoir to a writing head, which head is fed with ink by the capillary element and projects from the front portion of the body. The reservoir (3) is separated from the front chamber (6) by a flexible wall having shape memory and provided with slots (16), acting as a valve (13) suitable for opening when the ratio (A) of the pressure (P1) inside the reservoir (3) over the pressure (P2) inside the volume of the front chamber,(6) facing said valve (13) exceeds a first value (A1), and of reclosing instantly as soon as said ratio (A) becomes less than or equal to a second value (A2), the valve releasing the ink in the form of a jet directed towards the rear face (7a) of the capillary element (7). The instrument includes means for pressurizing the reservoir. The front chamber communicates with ambient air. The first value (A1) of the ratio (A) of the pressures (P1/P2) is preferably about 1.07, and the second value (A2) of said ratio (A) is preferably about 1.05.

L'article d'écriture à encre liquide de l'invention a un corps qui comporte intérieurement, de l'arrière vers l'avant, un réservoir pour l'encre, une chambre antérieure dans laquelle se trouvent un élément capillaire pour le transfert de l'encre provenant du réservoir et une tête d'écriture, alimentée en encre par l'élément capillaire et débouchant hors de la partie avant du corps. Le réservoir (3) est séparé de la chambre antérieure (6) par une paroi flexible, à mémoire de forme, munie de fentes (16), faisant office de valve (13), apte à s'ouvrir dès que le rapport (A) de la pression (P1) à l'intérieur du réservoir (3) sur la pression (P2) à l'intérieur du volume de la chambre antérieure (6) en regard de ladite valve (13) est supérieur à une première valeur (A1) et à se refermer instantanément dès que ledit rapport (A) est inférieur ou égal à une seconde valeur (A2), libérant l'encre sous la forme d'un jet dirigé sur la face arrière (7a) de l'élément capillaire (7). L'article comporte des moyens de mise en pression du réservoir. La chambre antérieure communique avec l'air ambiant. De préférence, la première valeur (A1) du rapport (A) des pressions (P1/P2) est de l'ordre de 1,07 et la seconde valeur (A2) dudit rapport (A) est de l'ordre de 1,05.

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