JPH0111511Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on the gap between the nib that protrudes from the nib and the nib during writing in a writing instrument such as a ballpoint pen that has a pen nib that can be retracted from the nib. This invention relates to a wobbling prevention device for writing instruments whose purpose is to prevent wobbling.

Conventional writing instruments of this kind, regardless of whether they are double or single type, have a pen tip such as a ballpoint pen that protrudes from the tip shaft, and those that do not have a locking step after the pen tip protrudes from the tip shaft have a hole at the tip of the tip shaft. The gap between the pen and the nib shaft causes wobbling, which causes dissatisfaction with the writing quality. In addition, this wobbling causes damage to the pen tip and shortens the life of the writing instrument.

This invention was made with the intention of solving the above problem, and a refill that does not have a step after the nib that protrudes from the nib is inserted into an anti-sway pipe that has a slit at its tip. At the same time, by applying an elastic force to the rear end of the anti-sway pipe, the tip of the anti-sway pipe comes into contact with the inner diameter end side of the nib shaft, thereby preventing the pen tip from wobbling when writing. An object of the present invention is to provide a device for preventing rattling of a writing instrument, which is characterized by:

Examples of this invention will be described below based on the drawings.

Figures 1 and 2 show a double-action writing instrument with a rattling prevention device of this invention.Inside the tip barrel 2 which has an opening 1 at the tapered tip, there are a lock-type sharp pencil 3 and a ballpoint pen 4. are housed so that they can be moved back and forth alternately between a writing position and a storage position, and sliding pieces 3' and 4' attached to the rear end sides of the sharp pencil 3 and ballpoint pen 4 rotate together with the cap 5, respectively. The sharpening pencil 3 or the ballpoint pen 4 is formed to be in contact with the inclined cam surface 6' of the cylindrical cam 6, and to selectively protrude from the tip shaft 2 by rotating the cap 5. In this case, the ballpoint pen 4 has one end fitted into the tip of the sliding piece 4' of the ballpoint pen 4, and the other end fitted into the tip of the receiving pipe 7 which projects toward the opening side of the tip shaft 2. Joint pipe 8 to be installed
Anti-sway pipe 9 detachably connected via
The ballpoint pen refill 4a is inserted into the anti-sway pipe 9 and the receiving pipe 7 from the tip of the anti-sway pipe 9. At this time, the nib 4b of the ball-point pen 4 is inserted in a state slightly protruding from the tip of the anti-sway pipe 9. , a warming spring 10 is disposed between the rear end of the ballpoint pen refill 4a and the sliding piece 4', and the receiving pipe 7
Spring receiver 11 fixed to the outer periphery of the intermediate part of
A contact adjustment spring 13 is interposed between the contact adjustment spring 13 and a stopper 12 fixed to the inner circumferential surface of the rear end of the joining pipe 8 and capable of sliding on the receiving pipe 7. It is designed to be transmitted to the anti-sway pipe 9 which is removably inserted into the distal end side of the joining pipe 8. The tip of the receiving pipe 7 is slightly expanded into a tapered shape to facilitate insertion of the ballpoint pen refill 4a, and a stopper 14 for restricting movement of the stopper 12 toward the tip side is attached to the receiving pipe 7. It is fixed to the outer periphery of the tip. Further, the anti-sway pipe 9 has a slit portion 9a at its tip, and its rear end is removably inserted into an insertion tube 8a fixed to the inner peripheral surface on the tip side of the joining pipe 8. It is designed so that it can be inserted into the joining pipe 8.

Due to the elastic force of the spring 13, the anti-sway pipe 9 and the insertion tube 8a are fixed to a degree that prevents them from moving back and forth, and are fixed to such a degree that they can be attached and detached when replacing the reel. has been done. That is, by setting the fitting dimension between the outer diameter of the anti-sway pipe 9 and the inner diameter of the insertion tube 8a, they are removably fixed.

On the other hand, on the inner diameter tip side of the tip shaft 2, that is, inward of the opening 1, a tapered stepped portion 1a is formed which becomes smaller in diameter toward the tip, and has the cap 5 as shown in FIG. When the ballpoint pen 4 is switched to the writing position, the tip of the anti-sway pipe 9 can come into contact with it. This contact state urges the elastic force of the contact adjustment spring 13, and together with the elastic deformation of the slit portion 9a of the anti-sway pipe 9, the anti-sway pipe 9
By pressing the distal end of the reel 4a in the centripetal direction, the ballpoint refill 4a is clamped, thereby preventing rattling phenomena such as horizontal shaking or movement in the axial direction.

In addition, although the above embodiment shows the case where the stepped portion 1a is provided on the inner diameter tip side of the tip shaft 2, it is not necessarily necessary to provide the step portion. A similar effect can be obtained by forming a tapered portion. Also,
At the tip of the anti-swaying pipe 9, for example, a
By providing a chamfered portion 9b as shown in FIG. 3 or a chuck portion 9c as shown in FIG. 3b, the ballpoint pen 4 can be further prevented from wobbling when writing.

Note that the ballpoint pen refill 4a can be detachably inserted into the anti-sway pipe 9 and the receiving pipe 7; It is preferable to attach and detach it to the insertion tube 8a because it is easier to replace.

Figure 4 shows a second embodiment of this invention.
By forming the contact adjustment spring 13 relatively long, compressing the contact adjustment spring 13 and sliding the anti-sway pipe 9 formed relatively short rearward when replacing the ballpoint pen re-reel 4a, the re-reel 4a can be replaced. It is designed to make it easy to perform.

FIG. 5 shows a third embodiment of this invention, in which a single ballpoint pen is equipped with the device of this invention. In this case, a tapered stepped portion 15a is provided on the inner diameter tip side of the mouthpiece 15 attached to the tip of the tip shaft 2, and the elasticity of the contact adjustment spring 13 is provided on this tapered stepped portion 15a. Although the anti-swaying pipe 9 that applies the force is brought into contact with the pipe 9, it goes without saying that other embodiments may be adopted as in the above-mentioned embodiments.

As described above, the present invention provides a writing instrument, such as a ballpoint pen, in which the nib is formed to be retractable from the nib, and a re-feel that does not have a step after the nib that protrudes from the nib is attached to the tip of the writing instrument. The tip of the anti-sway pipe that is inserted into the anti-sway pipe 9 having a slit 9a and applies the elastic force of the elastic means to the rear end thereof is attached to the inner diameter end side of the tip shaft 2 with a small diameter The tapered step portions 1a and 15a are provided so that they can come into contact with each other.

Therefore, when writing, the centripetal deformation of the anti-sway pipe that comes into contact with the inner diameter tip of the nib shaft prevents the re-feel from swaying laterally or moving in the axial direction, eliminating the discomfort caused by rattling when writing. can do.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of a writing instrument equipped with the rattling prevention device of this invention, Fig. 2 is a cross-sectional view showing the main part of the writing instrument in the writing state, and Figs. 3 a and b are anti-shaking devices of this invention. FIGS. 4 and 5 are cross-sectional views of main parts showing other embodiments of this invention, respectively. DESCRIPTION OF SYMBOLS 1...Opening part, 1a...Taper step part, 2...Tip shaft, 4...Ballpoint pen, 4'...Sliding piece, 4a
...Ballpoint refill, 4b...Nib, 7
... Reception pipe, 8 ... Connection pipe, 9 ... Anti-sway pipe, 9a ... Slit part, 9b ... Chamfered part, 9c ... Chack part, 10 ... Buffer spring, 11 ... Spring receiver, 12 ... Stopper, 13 ... Contact adjustment spring, 14 ... Stopper, 15 ... Mouthpiece, 15a ... Taper step.

Claims (1)

[Scope of utility model registration request] In a writing instrument, such as a ballpoint pen, in which the nib is formed to be retractable from the nib, a re-feel having no step after the nib that protrudes from the nib is fitted into an anti-swaying pipe having a slit at its tip. The tip of the anti-sway pipe that applies the elastic force of the elastic means to the rear end of the tip shaft is provided with a tapered step portion that becomes smaller in diameter toward the tip, and can come into contact with the tip of the anti-sway pipe that applies the elastic force of the elastic means. A writing instrument rattling prevention device formed as follows.