Coating implements with material supply – Material flows through porous tool – Wick feed from within reservoir to tool
Patent
1990-03-26
1992-02-11
Bratlie, Steven A.
Coating implements with material supply
Material flows through porous tool
Wick feed from within reservoir to tool
401227, 401229, B43K 804, B43K 708, B43K 518
Patent
active
050871447
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a temporary ink storage member for temporarily storing ink so as to suppress excess discharge and prevent insufficient discharge of ink due to changes in temperature and pressure when ink inside an ink tank is supplied to a pen tip. The invention further relates to a writing instrument having this temporary ink storage member inside a shaft body between a pen tip and an ink tank.
2. Description of the Prior Art
Writing instruments storing therein ink can be classified broadly into two kinds, depending on the mode of storage of ink. One kind utilizes an ink absorption member which functions to retain ink by utilizing the capillary force of, for example, a fiber aggregate, and the other kind merely stores ink in a container-like ink tank without relying in particular on the capillary force, as typified by an ordinary fountain pen.
As is well known, the latter generally uses a member for storing temporarily ink in order to prevent the occurrence of excess of insufficient ink supply from the ink tank to the pen tip due to changes in temperature and pressure.
Various contrivances have been made in the past in order to have the temporary ink storage member fully perform its functions.
Japanese Utility Model Publication No. 32790/1986, for example, discloses a device wherein the capillary force of each member forming the temporary ink storage member is different from other members forming the temporary ink storage member, wherein the members are arranged in a predetermined order so as to improve reliability of the ink storage function.
Besides the prior art reference described above various shapes and structures of temporary ink storage members are known, but most of them are made of a synthetic resin by injection molding. A large member of high quality writing instruments have been proposed, and put into practical application as products, due to various contrivances for the temporary ink storage member. However, they are not yet entirely satisfactory.
The greatest problem lies in that a temporary ink storage member capable of storing a large quantity of ink has not yet been invented. The capacity of the ink tanks of fountain pens that are now available on the market, for example, is about 1 cc and at most about 2 cc. However, a temporary ink storage member of a writing instrument capable of storing a large quantity of ink must itself be capable of storing a large quantity of ink.
The conditions that must be satisfied in order to let the temporary ink storage member fully perform its functions are listed below. ink corresponding to an expansion quantity of air when air inside the ink tank expands, in order to prevent ink from flowing out. the ink tank when the volume of air inside the ink tank shrinks. If air enters the ink tank while ink temporarily remains in the ink storage member, the quantity of ink that is left inside the temporary ink storage member increases gradually over repeated cycles of volume changes of the air in the ink tank, until it reaches a point where the temporary ink storage member will no longer function. the pen tip during writing, the temporary ink storage member must be able to preferentially supply this stored ink to the pen tip rather than the ink inside the ink tank, or must be able to preferentially return this stored ink to the ink tank rather than air, in order to prevent the drop of the pressure of the ink tank due to consumption of ink from the ink tank by the pen tip. This is due to the same reason as the condition (2) described above. portion. Since an ink tank opening other than the pen tip is formed, ink will flow more than necessary and result in leakage of ink, unless the capillary force is sufficiently high. If it is higher than that on the pen tip side, the movement of ink due to the change of the internal pressure of the ink tank will occur on the pen tip side. In addition, when ink is consumed by the pen tip during writing, ink staying in the temporary ink storage member then returns to th
REFERENCES:
patent: 2681041 (1954-06-01), Zodtner et al.
Asano Katsuo
Kono Tadashi
Suzuki Kazunori
Wada Yoshihiro
Bratlie Steven A.
Pentel Kabushiki Kaisha
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