Abstract:
A pressure-sensed ink-filled pen comprises at least a pen tube, a valve, a filler seat and a filler. An ink outlet is formed within the front portion of the pen tube. An U-shape valve made of a relatively soft material is mounted in front of the ink outlet. A filler seat embedding a filler at the front end thereof is received in a flexible relation within the front portion of the pen tube, allowing a longitudinal movement. By pressing the filler and the filler seat at one end to cause another end to open the valve, a pressure-sensed ink-filled pen with proper ink supply is formed.

Description:
BACKGROUND OF THE INVENTION 
     (a) Field of the Invention 
     The invention relates to pressure sensed ink-filled pen and more particularly to a structural improved pen with pen tube filled with ink for the filler to absorb, by which proper measure of ink is supplied to avoid waste of ink and leads to structural simplification and reduction of cost. 
     (b) Description of the Prior Art 
     One type of conventional ink-filled pen has ink filled in pen tube for the filler to absorb. The prior art usually plant the filler at the front end of pen tube to absorb ink within. However, such model makes the filler absorb ink extravagantly and easily leads to fast running out of ink, crumpled and ragged paper while exceeded ink smear over paper, and also makes ink hard to dry. 
     So another model of ink-filled pen with a mechanism to adjust the supply of ink to fix said disadvantages could be found in the market. However, such commonly seen ink-supply-controlled pen generally has lots of components installed at the inner front end of pen tube, therefore makes overall structure of pen complicated. It does not only lead to tedious fabrication procedure but also the difficulties to cut down manufacturing cost. 
     SUMMARY OF THE INVENTION 
     The purpose of the invention is to provide a pressure sensed ink-filled pen model comprising at least one pen tube, one valve, one filler seat, and one filler with one ink outlet installed inside the front end of said pen tube, and said U shaped soft material valve installed covering upon the front of said ink outlet inside the front end of said pen tube, by which said filler seat at the front of said pen tube with said filler pivoted constitute one pressure sensed ink-filled pen so that by pushing said filler seat and said filler, said valve could be pushed open to ensure proper measure supplement of ink. Accordingly waste of ink could be avoided and the manufacturing cost could be cut down. 
     The secondary purpose of the invention is to provide a pressure sensed ink-filled pen model with an end cover installed at the rear end of said pen tube by which ink within said pen tube is sealed up. 
     Another purpose of the invention is to provide a pressure sensed ink-filled pen model such that at the front end of the end cover a longer hollow inserting section is installed extending into the pen tube in the front, by which at the front end of said inserting section an inner stopper could be installed to reduce the space within said pen tube therefore the deposition of ink can be controlled. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is the exterior view illustrating the comprising parts of the invention. 
     FIG. 2 is the exterior view illustrating the status with the pen cover separated from the pen. 
     FIG. 3 is the view with all comprising parts disassembled. 
     FIG. 4 is the cutaway view of the invention. 
     FIG. 5 illustrates the filler seat being pushed forward by said valve. 
     FIG. 6 illustrates said valve of said filler seat. 
     FIG. 7 illustrates another example of the end cover of this invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As FIGS. 1,  2  and  3  illustrate, the so-called “pressure sensed ink-filled pen” design of this invention comprises at least one pen tube  1 , one valve  2 , one filler seat  3  and one filler  4 . Also, one pen cover could be adopted so that the filler could be protected. 
     Among the components, the pen tube  1  is a hollow tube with one opening at one end or two openings at both ends by which one end cover  11  is clogged up at the rear end of the tube to seal up the back end opening (see FIG.  3 ). However, the front end of the pen tube  1  is an engaging portion  12  with a slightly smaller diameter. There is a plurality of hook-and-halt granules  13  at the front part of the inner opening of the engaging portion  12 . A concave-shaped stopping piece  14  is either unitarily formed at a chosen part to the rear of the engaging portion or is installed to separate off the pen tube the stopping piece  14  has an ink outlet at the center  141 . At the front of the ink outlet there is a recess with a larger diameter  142  by which the stopping piece constitute an ink reservoir in the pen tube. Moreover, the following components of the pen tube could be installed in front of the stopping piece: 
     The valve  2  is a U shape round mask (see FIG. 5) made of soft and elastic plastic or rubber and there is an axial via hole  21  at the center. A tapered toggle is unitary formed inside the axial via hole  21  by which a valve to control the ink flow is formed. 
     A filler seat  3 , as shown in FIG. 5 or FIG. 6, is utilized for inserting the filler  4  and controlling a timely ink supply. It can be in the shape of a hollow cylinder. An aperture for planting filler  31  is formed in the center of the filler&#39;s front end, extending into the filler&#39;s interior. An ink guide hole  32  is formed on the base of the aperture for planting the filler  31 . A top post  33  is erected on the rear end of the filler seat  3 . A stepped ring  34  is formed around the root of the top post  33 . One or more radial ink inlets  35  are formed around the top post  33 , by which ink can flow into the filler seat  3  of the aperture for planting filler  31  through the radial ink inlets  35  and the ink guide hole  32 . 
     Filler  4 , as shown in FIG. 5 or FIG. 6, is for carrying out writing or drawing through absorbing ink. A pen nib  41  at its front end is formed into the shape of a wedge or a cone or others admitting a pointed tip. An ink absorption connecting filler  42 , used for guiding ink to the front end of a filler  4 , can be added at the rear end of the filler  4 . 
     A pen cover  5  is a cylinder that covers the front end of the pen tube  1  at the engaging portion  12  for protecting the filler  4 . A pen clip  51  can be installed outside the pen cover  5 . 
     By means of the structural features of the described pen tube  1 , valve  2 , filler seat  3  and filler  4 , as shown in FIG.  4  and FIG. 5, the U-shape valve  2  can be embedded in the front end of the pen tube  1  such that it covers the front end of the stopping piece  14 . And, further, the rear end of the filler  4  is embedded in the filler-embedding hole  31  on the filler seat  3  such that the ink absorption connecting filler  42  extends to the ink guide hole  32 , by which the filler seat  3  is inserted into the front end of the pen tube  1 . The action of the hook-and-halt granule  13  is used to enable an axial movement. And the top post  33  at the rear end of the filler seat  3  is inserted into the axial via hole  21  on the valve  2 . Applying the tight bond of the valve  2 , its axial via hole  21  and the tapered toggle  22  to the ink inlet  35 , the top post  33  may touch against or depart from the recess  142  and is able to push the valve  2  open, constituting the pressure-sensed ink-filled pen. 
     The present invention, improved in its structural design, can prevent the filled ink form evaporation and dry-out, with a further benefit of saving ink. When the pen is not in use, the spring of the valve  2  pushes the filler seat  3  forward, as shown in FIG. 5, making the top post  33  at the rear end of the filler seat  3  to depart from the recess  142  at the front end of the stopping piece  14  of the pen tube  1 , by which the ink outlet  141  becomes open. That is, ink is allowed to flow from ink outlet  141  to U-shape valve  2  for temporary storage. Meanwhile, the structure of the ink inlet  35  around the closed top post  33  of the valve  2  is applied to temporarily stop ink flowing into ink guide hole  32  and being absorbing by the filler  4 . Therefore, the filler  4  of the present invention does not absorb ink when it is not in use. 
     As the pen is in use for writing, the filler  4  is pressed against a paper such that the filler seat  3  contracts and its top post  33  props up against the recess  142  in front of the stopping piece  14  of the pen tube  1 , by which the ink outlet  141  of the pen tube  1  is closed and ink ceases to flow into the valve  2 . At the same time when the filler seat  3  contracts and shifts inwards, the stepped ring  34  encircling the base of the top post  33  pushes the surrounding area at the front end of axial via hole  21  of the valve  2  such that the valve  2  is slightly pressed down and accordingly the tapered toggle  22  looses the top post  33  to form a chink. In this manner, the ink temporarily stored in the valve  2  is allowed to flow through the ink inlet  35  to ink guide hole  32  such that the rear end of the filler  4  or the ink absorption connecting filler  42  can absorb ink for writing or drawing. 
     It is evident from the above description that the press-sensed ink-filled pen of the present invention allows the user to freely control the amount of ink flowing into the filler  4 ; when the user feels short of ink, he can push the filler seat  3  a few more times to acquire a proper amount of ink supply. Therefore, the present invention can effectively improve the disadvantage in wasting ink of the conventional inventions. The pressure-sensed ink-filled pen of the present invention is comprised only of the pen tube  1 , the valve  2 , the filler seat  3  and the filler  4 . It is a further object of the present invention to reduce the manufacturing cost, given its structural simplicity. Therefore, the present invention is indeed a practical improvement from the conventional inventions. 
     It is a further object of the present invention to properly control the amount of the ink stored in the pen tube  1 . The cover of the rear end of the pen tube  1  is not restricted to a particular shape. However, it has a longer hollow inserting section  111  at its front end, as shown in FIG.  7 . There is a bulged internal plug installed in the hole at the rear end of the inserting section  111 , by which the inner space of the open tube  1  can be reduced. Therefore, the ink capacity in the pen tube  1  can be set to a proper amount when the pen is being manufactured.