Ink Tube Structure

Abstract

An improved ink tube structure is disclosed. The improved ink tube structure of the present invention comprises a hollow ink tube and a writing tip. A first bent portion is disposed near the writing tip on the hollow ink tube so that a bent angle is formed at the first bent portion and a distance between the curvature center of the first bent portion and the end point of the writing tip is formed. In this way, an ergonomic design may be provided. A second bent portion may be disposed behind the first bent portion on the hollow ink tube. To keep the first bent portion from deforming, a retaining device is disposed at the first bent portion. A groove is provided on the retaining device so as to hold the first bent portion and keep the first bent portion from deforming.

1 . An improved ink tube structure, comprising:
 a hollow ink tube, which may hold ink; and   a writing tip,   characterized in that a first bent portion is disposed near the writing tip on the hollow ink tube and that the distance between the curvature center of the first bent portion and the end point of the writing tip (along the axial direction of the writing tip) is in the range from 1 cm to 3 cm.   
   
   
       2 . The improved ink tube structure as in  claim 1 , wherein a bent angle is formed at the first bent portion and the bent angle is between 100 degree and 165 degree. 
   
   
       3 . The improved ink tube structure as in  claim 1 , wherein the hollow ink tube may be consisted of two parts (a shorter front portion and a longer rear portion) and the rear portion has a larger inner diameter. 
   
   
       4 . The improved ink tube structure as in  claim 1 , wherein a retaining device is disposed at the first bent portion so that the first bent portion may be placed in the retaining device to keep the first bent portion from deforming. 
   
   
       5 . The improved ink tube structure as in  claim 4 , wherein the retaining device may be a metallic tube and, in manufacturing, the metallic tube is first placed over the first bent portion and then is bent. 
   
   
       6 . The improved ink tube structure as in  claim 5 , wherein a stabilizing seat is disposed under the retaining device and is able to keep the retaining device from deforming. 
   
   
       7 . The improved ink tube structure as in  claim 4 , wherein the stabilizing seat is integrally formed with the retaining device and the appearance of the stabilizing seat may be aesthetically appealing. 
   
   
       8 . The improved ink tube structure as in  claim 7 , wherein the retaining device may be a thin-layered unit and the thin-layered unit has a groove, and wherein a stabilizing piece is provided on either side of the groove and has a geometric shape so that the thin-layered unit, with its two stabilizing pieces, can keep the hollow ink tube from deforming. 
   
   
       9 . The improved ink tube structure as in  claim 1 , wherein a second bent portion may be disposed behind the first bent portion and a bent angle, between 100 degree and 165 degree, is formed at the second bent portion. 
   
   
       10 . The improved ink tube structure as in  claim 9 , wherein an angle, between 10 degree and 40 degree, is formed between the axis of the straight portion in front of the first bent portion and the axis of the straight portion behind the second bent portion. 
   
   
       11 . The improved ink tube structure as in  claim 9 , wherein a retaining device is provided at the first bent portion and a groove is provided on the retaining device and is configured to match the curves of the first bent portion and the second bent portion so as to hold the first bent portion and the second bent portion and keep them from deforming. 
   
   
       12 . The improved ink tube structure as in  claim 11 , wherein the retaining device may be a metallic tube and, in manufacturing, the metallic tube is first placed over the first bent portion and the second bent portion and then is bent. 
   
   
       13 . The improved ink tube structure as in  claim 11 , wherein a stabilizing seat is disposed under the retaining device so as to keep the retaining device from deforming. 
   
   
       14 . The improved ink tube structure as in  claim 13 , wherein the stabilizing seat is integrally formed with the retaining device and the appearance of the stabilizing seat may be aesthetically appealing. 
   
   
       15 . The improved ink tube structure as in  claim 11 , wherein the retaining device may be a thin-layered unit and the thin-layered unit has a groove, and wherein a stabilizing piece is provided on either side of the groove and either stabilizing piece has a geometric shape so as to keep the hollow ink tube from deforming. 
   
   
       16 . The improved ink tube structure as in  claim 1 , wherein a protective unit may be provided at the writing tip and the protective unit is connected with the lower end of the retaining device, and wherein a groove is provided on the retaining device and, in manufacturing, the writing tip is first inserted into the upper opening of the protective unit and then a portion of the protective unit is bent to form a connective portion and then the hollow ink tube is placed inside the groove so that both the writing tip and the first bent portion may be fixed and protected. 
   
   
       17 . The improved ink tube structure as in  claim 16 , wherein a stabilizing seat is disposed under the retaining device so as to keep the retaining device from deforming. 
   
   
       18 . The improved ink tube structure as in  claim 17 , wherein the stabilizing seat is integrally formed with the retaining device and the appearance of the stabilizing seat may be aesthetically appealing.