JP3158040U - Mounting structure for writing instrument cap - Google Patents

Abstract

The present invention provides an attachment structure for a writing instrument cap that can be removed by a thumb pressing operation. An outer cap 5 having a fitting portion to be fitted to a shaft cylinder 2 and an inner cap 6 formed in a bottomed cylinder shape and movable in the axial direction within the outer cap are provided. . The inner cap is provided with a cap side contact portion formed so as to be able to contact the shaft tube side contact portion 2e provided in the shaft tube portion 2. In the cap mounted state, the shaft tube side contact portion and the cap side contact portion are in contact with each other by the urging means that urges the inner cap toward the pen tip portion. Furthermore, a pressing portion that can maintain the contact state between the shaft cylinder side contact portion and the cap side contact portion by a pressing operation is provided. [Selection] Figure 1

Description

  The present invention relates to a writing instrument cap mounting structure, and specifically to a writing instrument cap mounting structure that can be easily removed by one-handed operation.

  Since the attachment / detachment operation of the cap attached to the cap-type writing instrument is usually performed using both hands, there is a problem that the attachment / detachment operation can be easily performed by one-hand operation. As a solution to this problem, the technique described in Patent Document 1 has been conventionally proposed for the operation of removing the cap. Patent Document 1 proposes a cap mounting structure in which a cap can be removed with one hand by pressing a protruding portion protruding from an end surface of the cap with a thumb while grasping the shaft tube with the palm of the hand. More specifically, the cap to be attached to and detached from the writing instrument is provided to be slidable with respect to the outer cap and the outer cap, and the protruding portion protrudes from the outer cap and is urged toward the opening end of the outer cap. And an inner cap. A sliding body that is movable along the shaft tube is provided on the shaft tube side. The inner cap and the sliding body are in contact with each other. Moreover, the sliding body and the outer cap are fitted to each other, and the cap is mounted on the writing instrument. When removing the cap, the inner cap is moved toward the moving body by pressing the protruding portion of the inner cap, and the sliding body moves toward the opening end of the outer cap in conjunction with the movement of the inner cap. The fitting with the moving body is released.

JP 61-259962 A

  In the cap mounting structure described above, the inner cap that moves by pressing forms a bottomed cylindrical shape. And the pen point part of a writing instrument is inherent in the internal space of an inner cap. On the other hand, the open end of the inner cap is in contact with the front end surface of the sliding body. Therefore, when the inner cap is pressed and moved in the direction opposite to the pen tip, the pressure increases in combination with a decrease in the volume of the inner space. As a result, the compressed air flows into the pen tip portion, and writing or ink leakage due to the backflow of ink occurs. Such a problem occurs not only in the markers but also in the ballpoint pen. Regardless of the type of ink in the ballpoint pen (oil-based, gel, water-based), compressed air flows from the clearance around the ball where the ink circulates at the tip of the ballpoint pen tip, thereby causing problems of writing and backflow.

  In addition, it is not clearly disclosed whether or not the contact surface between the opening end of the inner cap and the front end surface of the sliding body is airtight (tight plug), but even if it is not airtight, the contact surface should adhere to some extent. Thus, a pressure increase can temporarily occur due to the pressing operation. Furthermore, in the case of markers, the problem of volatilization of ink occurs unless airtight.

  Furthermore, when a conventionally disclosed structure in a cap is applied to a ballpoint pen that requires a seal rubber (for example, an aqueous direct liquid type ballpoint pen that requires an ink retaining member), the bottom of the inner space of the inner cap when the cap is mounted A seal rubber is provided (position facing the pen tip), and the seal rubber and the tip of the ballpoint pen tip come into contact with each other. However, when the operation for removing the cap is performed, the inner cap moves in the direction opposite to the pen tip, so that the contact state between the seal rubber and the ballpoint pen tip changes. Therefore, even if the inner cap moves, it is necessary to take measures such as newly providing a structure that does not move the seal rubber relative to the ballpoint pen tip.

  In addition, since it is necessary to provide a moving body on the side of the shaft cylinder and to provide an urging means for urging the moving body, the structure becomes complicated.

  The present invention is provided with an outer cap having a fitting portion that is fitted to the shaft tube, and an inner cap that is formed in a bottomed tube shape and is movable in the axial direction within the outer cap. It is an attachment structure of a writing instrument cap. The inner cap is provided with a cap side contact portion formed so as to be able to contact a shaft tube side contact portion provided in the shaft tube portion. Furthermore, the axial tube side contact portion and the cap side contact portion are in contact with each other by an urging means for urging the inner cap toward the pen tip portion. In addition, a pressing portion is provided that can maintain the contact state between the axial tube side contact portion and the cap side contact portion by a pressing operation.

  According to the present invention, in the cap mounted state, by pressing the pressing portion while grasping the outer cap with the palm of the hand, the outer cap is held while maintaining the contact state between the shaft tube side contact portion and the cap side contact portion. It can be moved in a direction away from the inner cap. That is, in other words, the inner cap is relatively fixed to the shaft tube portion (pen tip portion), and the outer cap and the inner cap (that is, the shaft tube portion (pen tip portion)) are relatively They will be moved away from each other. Then, the fitting state between the outer cap and the shaft tube portion is released, and the removal of the cap is completed.

  As described above, according to the present invention, since the cap can be removed by the pressing operation of the pressing portion, the cap can be easily removed with one hand by an operation method such as pressing a push button, for example. When removing the cap, the inner cap that contains the pen tip portion is relatively immovable with respect to the shaft tube portion, so that a pressure increase in the inner cap cannot occur. There is no inflow of compressed air. Furthermore, conventionally required structures such as an air tight part and a seal rubber can be used as they are depending on the type of writing instrument. Furthermore, if the shaft tube side contact portion is formed by a stepped portion, it is not necessary to have a specially complicated configuration on the shaft tube side, which has been conventionally required.

It is the principal part longitudinal cross-sectional view of the writing instrument which shows the attachment structure of the cap for writing instruments of this invention, and a cap. (A) shows a cap mounting state, and (b) shows a state where a cap is removed.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the forward direction refers to the direction of the pen tip side.

  FIG. 1 is a vertical cross-sectional view of the main part of the distal end portion (near the pen tip portion 3) of the shaft tube portion 2 of the writing instrument 1. The writing instrument 1 is a so-called marker pen, and is configured such that ink is supplied to the pen tip portion 3 from a batting (not shown) provided inside the shaft tube portion 2.

  The shaft cylinder part 2 is formed in a cylindrical cylinder as a whole. The shaft tube portion 2 includes a shaft tube main body portion 2a provided with batting not shown, a fitting tube portion 2b connected to the shaft tube main body portion 2a and having a diameter reduced from the shaft tube main body portion 2a, and a fitting tube portion 2b. It is formed from the front-end | tip cylinder part 2c connected to this, and diameter-reduced from the fitting cylinder part 2b. A pen tip portion 3 is provided at an end portion of the distal end cylindrical portion 2c. Further, the fitting cylinder portion 2b is provided with a first protrusion 2d formed in an annular shape.

  The shaft tube portion 2 is provided with a cap 4 for protecting the pen tip portion 3 and preventing ink volatilization. The cap 4 has an outer cap 5 formed in a substantially bottomed cylindrical shape, and an inner cap 6 is provided in the outer cap 5 so as to be movable in the axial direction.

  A second protrusion 5 a is provided on the inner peripheral surface near the rear opening of the outer cap 5. A plurality of second protrusions 5a are provided radially with respect to the axis. The second protrusion 5a forms a fitting portion together with the first protrusion 2d. In the present embodiment, the second protrusion 5a is formed by a crossover fitting that gets over the first protrusion 2d and is in a fitting state (a state where the cap 4 is attached to the shaft tube portion 2).

  In addition, the fitting state of a fitting part is maintained because the opening part end surface of the outer cap 5 and the step part formed of the axial cylinder main-body part 2a and the fitting cylinder part 2b contact | abut.

  On the other hand, the inner cap 6 is formed in a bottomed cylindrical shape. The inner cap has a large-diameter portion 6a on the rear side. A space is formed inside the large diameter portion 6a. The internal space in the large diameter portion 6a is formed so that the tip tube portion 2c and the pen tip portion 3 can be included. More specifically, the inner diameter of the large diameter portion 6a is set so as to be in close contact with the outer diameter of the distal end cylindrical portion 2c. Therefore, an air tight part is formed by the inner peripheral surface of the large diameter part 6a and the outer peripheral surface of the tip tube part 2c, and the internal space in the large diameter part 6a can be sealed.

  Further, a cylindrical projection 6b is formed that protrudes in a cylindrical shape from the large diameter portion 6a to the front. The columnar protrusion 6b is formed by reducing the outer diameter of the columnar protrusion 6b as compared with the large diameter portion 6a. And between the step part formed by the large diameter part 6a and the cylindrical protrusion 6b, and the bottom part inner surface (inner surface of the bottom part 5b) of the outer cap 5, the inner cap 6 is urged | biased back (shaft cylinder part side). A coil spring 7 is provided as an urging means. The coil spring 7 is formed along the outer periphery of the columnar protrusion 6b. Therefore, the coil spring 7 is held and guided by the cylindrical protrusion 6b. Moreover, the axial cylinder formed by the cap side contact part 6c formed in the opening part end surface of the inner cap 6 (large diameter part 6a) by the urging | biasing force of the coil spring 7, the fitting cylinder part 2b, and the front-end | tip cylinder part 2c. The side contact portion 2e is contacted.

  The front end of the columnar protrusion 6 b extends outward from the outer cap 5. The end surface of the columnar protrusion 6b is a pressing portion described later. The columnar protrusion 6 b passes through a guide hole 5 c formed in the bottom 5 b of the outer cap 5. The columnar protrusion 6b is close to or in contact with the guide hole 5c. On the other hand, a sliding portion 6d is provided on the outer peripheral surface at a substantially central position in the longitudinal direction of the large-diameter portion 6a toward the outer side in the radial direction. A plurality of sliding portions 6d are provided radially with respect to the shaft core. The radially outer surface of the sliding portion 6d is close to or in contact with the inner peripheral surface of the outer cap 5. Therefore, the inner cap 6 can move in the outer cap 5 in the axial direction by sliding contact between the sliding portion 6d and the inner peripheral surface of the outer cap 5 and sliding contact between the outer peripheral surface of the columnar protrusion 6b and the guide hole 5c. Is formed.

  On the inner peripheral surface of the outer cap 5, a restriction projection 5e is provided inward in the radial direction. A plurality of regulating protrusions 5e are provided radially with respect to the axis. By the contact between the restriction projection 5e and the sliding portion 6d, the movement of the inner cap 6 biased by the coil spring 7 in the axial opening end direction is restricted. That is, the circumferential positional relationship, size, and the like are set so that the regulation protrusion 5e and the sliding portion 6d are in contact with each other. Therefore, when the cap 4 is removed from the shaft tube portion 2, the inner cap 6 does not jump out of the outer cap 5.

Next, the operation of removing the cap 4 from the shaft tube portion 2 will be described.
First, grasp the outer periphery of the outer cap 5 with a palm or the like. And the press part which is an end surface of the column-shaped protrusion 6b is pressed with a thumb etc. FIG. Then, while the cap side contact portion 6c and the shaft tube side contact portion 2e are kept in contact, the shaft tube portion 2 is pushed backward as the inner cap 6 moves rearward. In other words, the outer cap 5, the inner cap 6, and the shaft tube portion 2 move in a direction away from each other. Then, the 2nd protrusion 5a gets over the 1st protrusion 2d, and a fitting state is cancelled | released (state of FIG.1 (b)).

  Here, normally, the fitting force of the air tight portion (the close force between the inner peripheral surface of the large diameter portion 6a and the outer peripheral surface of the distal end cylindrical portion 2c) is the same as the fitting force of the fitting portion (the second protrusion 5a is applied to the first protrusion 2d). Much smaller than the fitting force when getting over). Therefore, the cap 4 can be easily detached from the shaft tube portion 2.

  In this way, the inner cap 6 does not move relative to the shaft tube portion 2 (that is, the pen tip portion 3), so the internal space in the large diameter portion 6a (the space on the outer periphery of the pen tip portion 3). ) Is not increased, and therefore troubles such as inflow of compressed air to the pen tip 3 do not occur. Furthermore, since an air tight part is also provided, there is no fear of ink volatilization even when the writing instrument 1 is stored.

  In addition, in order to attach the cap 4 to the axial cylinder part 2, the nib part 3 is inserted from the opening end of the cap 4 similarly to the normal cap for writing instruments. Then, by pushing in each other, the second protrusion 5a gets over the first protrusion 2d, the fitting portion is fitted, and the cap 4 is attached. At this time, the inner cap 6 is biased rearward by the coil spring 7, and the cap side contact portion 6 c contacts the shaft tube side contact portion 2 e, so that the inner cap 6 moves relative to the shaft tube portion 2. Fixed to impossible.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to this, It can change suitably in the range which does not change the summary of this invention. For example, the entire writing instrument 1 may be formed in a rectangular tube shape. The type of writing instrument is not limited to this, and can be applied to markers (fiber bundle chips or resin chips), ballpoint pens, fountain pens, and the like.

  For example, even when the writing instrument 1 is composed of a ballpoint pen (such as an aqueous ballpoint pen) that requires an in-cap seal rubber, it is possible to provide a seal rubber in contact with the tip of the ballpoint pen tip in the inner cap 6 as in the prior art. Further, depending on the type of the writing instrument 1, there is no need to provide an air tight portion. Further, the coil spring 7 as the urging means can be changed to, for example, an air damper or a leaf spring.

DESCRIPTION OF SYMBOLS 1 Writing implement 2 Shaft cylinder part 2a Shaft cylinder main-body part 2b Fitting cylinder part 2c Tip cylinder part 2d 1st protrusion 2e Shaft cylinder side contact part 3 Pen tip part 4 Cap 5 Outer cap 5a Second protrusion 5b Bottom part 5c Guide hole 5e Restriction protrusion 6 Inner cap 6a Large diameter part 6b Columnar protrusion 6c Cap side contact part 6d Sliding part 7 Coil spring

Claims (1)

A writing instrument having a nib portion and a shaft tube portion;
An outer cap formed in a cylindrical shape and provided with a first protrusion that constitutes a fitting portion for enabling attachment and detachment of the writing instrument to the pen tip side;
A second protrusion provided on the shaft tube portion and constituting the fitting portion together with the first protrusion;
An inner cap which is formed in a bottomed cylindrical shape and is provided so as to be movable in the axial direction in the outer cap;
A cap-side contact portion that is provided on the inner cap and formed so as to be able to contact a shaft-tube-side contact portion formed on the shaft-tube portion;
Urging means for urging the inner cap toward the shaft tube portion side, and causing the cap-side contact portion to contact the shaft tube-side contact portion;
A pressing portion that maintains the contact state between the shaft tube side contact portion and the cap side contact portion by a pressing operation;
A mounting structure for a writing instrument cap, comprising:

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