JP5412319B2 - Multi-core writing instrument - Google Patents

Description

  The present invention relates to a multi-core writing instrument. More specifically, a plurality of writing cores to which the knock member is connected are provided, the pen tip protrudes when one knock member is pressed, and the one knock member is released when the other knock member is pressed. About writing instruments.

  Conventionally, in a multi-core writing instrument having a plurality of writing cores to which a knock member is connected, a multi-core writing instrument is disclosed in which a user selects a writing core with a favorite knock member and arbitrarily configures the multi-core writing instrument. . In this case, the writing core is prepared with a plurality of ink colors and types of writing instruments (such as ballpoint pens and mechanical pencils), and the user selects two or more writing cores from among them to constitute a multi-core writing instrument.

  In the multi-core writing instrument disclosed in Patent Document 1, a window portion (window hole 41) from which a pressing operation portion (operation portion 71) of a knock member (operation body 7) protrudes outward is provided as a shaft cylinder (rear shaft 4). There is disclosed a configuration in which a lid portion (5) that opens to the rear end (opening portion 42) and closes the opened rear end is formed to be openable and closable by a hinge portion (52). The user arbitrarily selects the writing core (writing body 6) to which the knock member (operating body 7) is connected, and opens the lid (5) to select the selected writing core (writing body 6). It is inserted from the opening (42) at the rear end of the (rear shaft 4). After the insertion, the lid (5) is closed to configure the multi-core writing instrument.

  The knock member (operation body 7) is urged rearward, and the rear end of the knock member (operation body 7) is formed so as to be able to come into contact with the lid portion (5).

JP2007-38635A

  In the above-mentioned multi-core writing instrument, the lid needs to be opened and closed for insertion and removal of the writing core, so if you forget to close the lid or perform an incomplete closing operation, When moving backward due to the urging force of the coil spring, problems such as jumping out of the shaft tube occur. Further, when the multi-core writing instrument is carried, there is a risk that the lid portion is unexpectedly disengaged, the lid portion opens, and the writing core pops out from the rear end of the shaft cylinder. Further, since the rear end of the knock member is brought into contact with the lid portion, the rear end of the knock member collides with the lid portion by the biasing force of the coil spring every time the writing core is released. In order to prevent the lid from opening due to repeated collision of the knock member with the lid, it is conceivable to increase the engagement when the lid is closed. It is difficult to open the lid, which is very inconvenient. On the other hand, in order to solve this problem, the urging force of the coil spring can be weakened. In this case, the knock member does not completely return to the rear end. In recent years, in a multi-core writing instrument having a writing core to which a knock member is connected, the knock member is not directly brought into contact with the rear end wall of the shaft cylinder, and is provided in the shaft cylinder (for example, on the guide of the knock member), The rear end of the shaft tube is prevented from being damaged (see Japanese Patent Application Laid-Open No. 2009-826).

  The present invention provides a shaft tube, a plurality of writing cores accommodated in the shaft tube, and a rear end of the writing core, and is provided slidably along the axis of the shaft tube, A knock member that is urged rearward by a resilient member provided in the cylinder and configured to be able to switch between a writable state and a released state by a pressing operation, and is formed on the shaft cylinder and presses the knock member And a window portion from which the operation piece projects, and a flexible material, formed so as to be able to contact the rear end of the knock member in the released state of the writing core, and the shaft center of the shaft cylinder A multi-core writing instrument comprising a wall portion having a slit formed in a direction.

  In the present invention, a wall portion formed of a flexible material (for example, an elastomer which is an elastic material) and having a slit formed in the axial direction of the shaft cylinder is provided in the window portion of the multi-core writing instrument. Here, the writing core to which the knock member is connected is inserted from the rear end of the shaft tube toward the window portion. Then, the knock member (specifically, the vicinity of the base of the operation piece protruding from the knock member) and the wall portion come into contact with each other. Therefore, when the knock member is further pushed forward, the slit of the wall portion is pushed and widened. When the knock member completely passes through the slit in the wall, the slit is closed by the elastic force of the material forming the wall.

  When replacing the writing core, the slit of the wall is widened by pushing (pulling) the knock member backward, and the writing core can be taken out from the rear end of the shaft cylinder.

  That is, according to the present invention, in a multi-core writing instrument that allows a user to select and configure a favorite writing core, the writing core can be inserted without having to open and close the lid provided at the rear end of the shaft cylinder. Can do. And since a slit is closed by the elastic force of a wall part, a writing core does not protrude unexpectedly at the time of carrying. Furthermore, the rearward biasing force of the knock member (writing core) can also be set so as to operate properly, so that no malfunctions occur. Furthermore, when the written state is released, the rear end of the knock member collides with the wall portion formed of the elastic material. Therefore, the impact due to the collision is absorbed, the impact sound is reduced, and product defects such as defects such as non-writing due to the impact (so-called back shock) can be prevented.

It is a longitudinal cross-sectional view of the multi-core writing instrument which concerns on 1st Embodiment of this invention. Indicates the release state. It is II sectional drawing of FIG. It is a longitudinal cross-sectional view of the multi-core writing instrument which concerns on 1st Embodiment which shows a writable state. It is the side view which looked at the multi-core writing instrument of FIG. 1 from the A direction. It is IV-IV sectional drawing of FIG. It is another example of the knock member in 1st Embodiment. (A) is a whole side view, (b) is a figure showing the (b)-(b) cross section of (a). FIG. 6 is a perspective view of the knock member shown in FIG. 5. It is a principal part enlarged side view which shows the other example of the wall part in 1st Embodiment (corresponding to FIG. 3). Furthermore, it is a principal part expanded side view which shows the other example of the wall part in 1st Embodiment (corresponding to FIG. 3). Furthermore, it is a principal part expanded side view which shows the other example of the wall part in 1st Embodiment (corresponding to FIG. 3).

  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.

  A first embodiment of the present invention is shown in FIGS. The multi-core writing instrument 1 has a substantially cylindrical shaft 2 and has a plurality of writing cores 3 incorporated therein. In this embodiment, two types of writing cores, a ballpoint pen 3a and a mechanical pencil 3b, are incorporated. Knock members 4 (4a, 4b) are connected to the rear end of the writing core 3, respectively. In the present embodiment, a fitting portion (not shown) at the tip of the knock member 4 is press-fitted and fixed in a hole at the rear end of the writing core 3 formed in a cylindrical shape.

  The knock member 4 is formed with an operation piece 42 that protrudes from the main body portion 41 in the longitudinal sectional view toward the radially outer rear side. On the other hand, a window portion 21 is formed on the rear side of the shaft tube 2 so as to correspond to the writing core 3, and an operation piece 42 projects outside the shaft tube 2 through the window portion 21.

  Further, sliding pieces 43 protrude from both side surfaces of the knock member 4. On the other hand, at the rear of the shaft tube 2, a knock guide portion 22 is formed in a concave shape in a cross section corresponding to the sliding piece 43 and continuously from the rear end of the shaft tube 2 in the axial direction of the shaft tube 2. ing. That is, the sliding piece 43 is guided by the knock guide portion 22 in a direction along the axis of the shaft tube 2 (in other words, the front-rear direction). Therefore, the knock member 4 is guided in a direction along the axis of the shaft cylinder 2.

  Further, a locking protrusion 44 (see FIGS. 5A, 5B, and 6) for locking a coil spring 5 (5a, 5b), which will be described later, is formed on the front side of the knock member 4 so as to protrude from the side surface. .

  A divider 6 is fixedly provided in the axial direction of the inside of the shaft cylinder 2 near the center rearward. The divider 6 is provided with guide holes 61 (61 a and 61 b) for guiding the writing core 3 corresponding to the writing core 3. And, between the guide holes 61 (in other words, the center position of the divider 6), a cylindrical coil guide 62 is erected rearward. One end side of the coil spring 5 is locked to the locking protrusion 44 of the knock member 4 described above. The other end of the coil spring 5 is press-fitted and held in a coil spring holding hole 611 (611a, 611b) formed behind the guide hole 61.

  The coil spring 5 is provided between the locking projection 44 and the coil spring holding hole 611 so that the writing core 3 is loosely fitted in the center and is in a resilient state. Therefore, the knock member 4 (and the writing core 3 provided continuously) is urged rearward.

  On the other hand, on the surface of the knock member 4 facing the operation piece 42, a release projection 45 is formed to project forward. Similarly, a released protrusion 46 is formed behind the releasing protrusion 45 so as to protrude. Further, a locking portion 221 that locks the rear end surface 47 of the knock member 4 in a writable state is formed at the front end of the knock guide portion 22 of the shaft cylinder 2 (see FIG. 2).

  The shaft cylinder 2 is formed with a tapered front end, and an opening 23 in which the pen tip 31 (31a, 31b) can protrude and retract is opened.

  A wall portion 7 is formed at the rear end of the shaft cylinder 2 in an annular shape when viewed from the rear. The wall 7 is made of an elastic material such as an elastomer. The joint with the shaft cylinder 2 can be formed by two-color molding, insert molding, adhesion, press fitting, or the like.

  The knocking operation (switching between the writable state and the released state) of the multi-core writing instrument 1 is based on a known prior art, but will be described briefly. In a state where the writing core 3 is immersed in the shaft cylinder 2 (the state of FIG. 1, that is, the released state), the rear end surface 47 of the knock member 4 is in contact with the front surface of the wall portion 7. Then, the slide piece 43 slides on the knock guide portion 22 by pressing the operation piece 42 forward. When the front end of the knock guide portion 22 is reached, the engagement between the knock guide portion 22 and the sliding piece 43 is released. Therefore, the knock member 4 falls inward in the radial direction of the shaft tube 2. At this time, the rear end surface 47 of the knock member 4 is locked to the locking portion 221 provided on the distal end side of the knock guide portion 22, and the pen tip 31 protrudes from the opening portion 23 so that writing is possible (the state shown in FIG. 2). )

  To release the writable state, the knock member 4 in the released state is pressed. Then, the release protrusion 45 of the knock member 4 that has been pressed comes into contact with the released protrusion 46 of the knock member 4 in the writable state, and pushes the knock member 4 in the writable state outward. Then, the sliding piece 43 again engages with the knock guide portion 22, and the knock member 4 (writing core 3) moves to the rear end (wall portion 7) by the urging force of the coil spring 5.

  In addition, although the protrusion etc. for preventing the excessive depression to the radial inside of the axial cylinder 2 of the knock member 4 in a writable state are not shown in figure, you may form separately.

  In the wall portion 7 formed at the rear end of the multi-core writing instrument 1 according to the present invention, a slit 71 is formed in the axial direction of the axial tube 2 corresponding to the window portion 21. Here, the rear end surface of the shaft tube 2 has a region where there is a flat surface and is in close contact with the wall portion 7 (hereinafter referred to as a close contact region T), and a radial region of the window portion 21 (hereinafter referred to as an open region S). And) exist. The wall 7 is adhered and fixed in the adhesion region T by the above-described two-color molding or adhesion. The aforementioned slit 71 is formed in the opening region S. That is, the slit 71 is formed continuously with the window portion 21. Further, in the opening region S (see FIG. 3), the wall portion 7 is formed of an elastic material, and thus has flexibility. Therefore, when the slit 71 is opened as described later, the slit 71 and the window portion 21 communicate with the outside.

  Next, a procedure for replacing the writing core 3 will be described. In order to remove the built-in writing core 3 in the state of FIG. 1, the knock member 4 (operation piece 42) is pushed backward with a thumb or the like. At this time, the rear end surface 47 of the knock member 4 presses the wall portion 7. Then, the wall part 7 of the opening area | region S divided | segmented by the slit 71 bend | folds outwardly (back side) in the shape of a double door. When the rear portion of the knock member 4 protrudes to the outside (rear side) to some extent, the writing core 3 (knock member 4) can be pulled out by picking it with a finger or the like. At this time, the other end side of the coil spring 5 is held in the coil spring holding hole 611, so that it remains in the shaft tube 2.

  Next, the user's favorite writing core 3 (for example, appropriately selected according to the ink color, the ballpoint pen line width, etc.) is selected. The writing core 3 (pen tip 31) is inserted toward the guide hole 61 of the divider 6 provided in the shaft cylinder 2. Then, the ridge line portion 48 that connects the operation piece 42 of the knock member 4 and the main body portion 41 in contact with the outer surface of the wall portion 7 in a longitudinal sectional view. When the knock member 4 is further pushed forward, the wall portion 7 in the opening region S in which the ridge line portion 48 is divided by the slit 71 is pushed forward in a double-spread shape. As the knock member 4 advances forward, the sliding piece 43 is eventually inserted into the knock guide portion 22 and the knock member 4 starts to be guided. When the rear end face 47 of the knock member 4 is completely pulled out of the slit 71, the deformation of the wall portion 7 having elastic force is naturally restored, and the slit 71 is closed.

  As described above, the user can appropriately select and replace / use the writing core 3 of his / her preference. Therefore, the replacement work of the writing core 3 can be performed more easily than a conventional multi-core writing instrument which opens and closes the rear end and performs the replacement operation. Can be done. In addition, since there is no problem such as the opening / closing part opening unexpectedly, the safety in carrying can be improved. Furthermore, since the knock member 4 is in contact (collision) with the wall portion 7 made of an elastic material at the time of the release operation, the impact is absorbed and the occurrence of problems such as a back shock can be prevented.

  Here, the wall portion 7 is formed in an annular shape when viewed from the rear of the multi-core writing instrument 1, but is formed in a disk shape to prevent mixing of dust and the like. It is also possible to form slits as appropriate so that the release protrusions 45 and the release protrusions 46 pass easily.

  Another example (knock member 4 ′) of the knock member 4 in the first embodiment is shown in FIGS. 5 and 6. In addition, the same code | symbol is attached | subjected about the same member and the site | part as 1st Example, and the same name is used.

  In the present embodiment, the cross-sectional shape of the ridge line portion 48 ′ from the operation piece 42 ′ to the main body portion 41 ′ is a convex curved surface shape. Thereby, in the contact of the ridge line part 48 ′ with the wall part 7 in the insertion operation of the writing core 3, the surface pressure of the pressing surface to the contact part of the ridge line part 48 ′ can be increased. Therefore, since the slit 71 can be expanded with a lower pressing force than in the first embodiment, the insertion operation is facilitated.

  On the other hand, by having the rear end surface 47 similar to that of the first embodiment, a larger pressing force (equivalent to the first embodiment) than the insertion operation is required when the writing core 3 is taken out from the multi-core writing instrument 1. . In the present embodiment having such a feature, the writing core 3 (knock member 4 ') that is easy to insert but difficult to take out can be configured. Therefore, a favorite writing core is selected for the first time, and is almost exchanged later. It is possible to provide a multi-core writing instrument suitable for users who do not need it.

  As a modification of the present embodiment, a convex curved surface shape of the ridge line portion 48 ′ is also provided on the rear end surface 47 ′ (not shown), and the knock member 4 ″ that can be operated with a low pressing force by both insertion and removal operations. (Not shown). Furthermore, it is also possible to provide a convex curved surface shape only on the rear end surface. Furthermore, although the convex curved surface shape is provided before and after the ridgeline portion 48 ′, a difference in the pressing force for insertion / extraction can be provided by making the curvatures different.

  7 and 8 show another example (wall portion 7 ') of the wall portion 7 in the first embodiment. Compared to the first embodiment, the shape of the wall 7 'around the slit 71' (opening region S) is variously changed. The material of the wall 7 ′ and the required thickness (particularly the thickness of the wall 7 ′ for adjusting the pressing force of the rear end face 47 of the knock member 4 due to the elastic force of the coil spring 5 and the ease of replacing the writing core 3) The setting can be changed as appropriate. For example, in FIG. 7, the wall portion 7 ′ is formed so that the thickness of the wall portion 7 ′ decreases linearly from both ends in the radial direction of the window portion 21 (both ends of the opening region S) toward the slit 71 ′. Similarly, in FIG. 8, only the outer surface of the wall 7 ′ is thin while being formed into a curved surface. In FIG. 7, the pressing force (the force for opening the slit 71 ′) at the time of replacing the writing core 3 is reduced for both insertion and removal. In FIG. 8, the pressing force can be reduced when the writing core 3 is inserted.

  In addition to these examples, the shape of the wall portion in the opening region S can be changed as necessary.

  FIG. 9 shows another example of the wall portion 7 (wall portion 7 ″) in the first embodiment. In the present embodiment, the wall portion 7 ″ is provided at a position moved in the forward direction from the rear end (in other words, in the middle of the window portion 21). The fixing method of the wall portion 7 ″ can be configured by various methods such as two-color molding, adhesion, and fitting as in the first embodiment. Also in this embodiment, the shape of the wall portion in the opening region S can be variously changed.

  In this embodiment, since a space area can be provided behind the wall portion 7 ″, another device such as an eraser, a correction tape, or a USB memory can be provided, or a protective cap can be provided. Further, the knock guide portion 22 can be provided between the wall portion 7 ″ and the rear end of the shaft tube 2. Therefore, since the knock member 4 is reliably guided, the writing core 3 can be reliably inserted and removed.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to this, In the range which does not change the summary of this invention, it can change suitably.

  For example, in the embodiment, the shaft cylinder 2 is integrally formed, but the upper cylinder and the lower axis may be divided into two or more. Moreover, about the writing core 3, although the multi-core writing instrument 1 which incorporated two (2 types) in the Example was taken as an example, you may comprise by three (3 types) or more writing cores. Furthermore, although the knock member 4 is directly connected to the writing core 3, it may be connected via another connecting member (member for performing centering, etc.).

DESCRIPTION OF SYMBOLS 1 Multi-core writing instrument 2 Shaft cylinder 21 Window part 22 Knock guide part 221 Locking part 23 Opening part 3 Writing core 31 Pen tip 3a Ball-point pen 3b Mechanical pencil 4 Knock member 41 Main body part 42 Operation piece 43 Sliding piece 44 Locking protrusion 45 Release projection 46 Release projection 47 Rear end surface 48 Edge line portion 5 Coil spring 6 Divider 61 Guide hole 611 Coil spring holding hole 62 Coil guide 7 Wall portion 71 Slit S Open region T Adhesive region

Claims (3)

A barrel,
A plurality of writing cores housed in the shaft cylinder;
Connected to the rear end of the writing core, provided slidably along the axial center of the shaft cylinder, urged rearward by a resilient member provided in the shaft cylinder, and capable of writing by pressing operation And a knock member configured to be switchable between a released state and
A window part formed on the shaft cylinder, from which an operation piece for pressing the knock member protrudes;
A wall portion formed of a flexible material, formed so as to be able to contact the rear end of the knock member in the released state of the writing core, and having a slit formed in the axial direction of the shaft cylinder,
A multi-core writing instrument comprising: The multi-core writing instrument according to claim 1, wherein the wall portion is formed at a rear end of the window portion. The multi-core according to claim 1 or 2, wherein a cross-sectional shape end portion is formed in a curved shape in both a front portion, a rear portion, and a front and rear portion of a ridge line portion extending from the main body portion of the knock member to the operation piece. Writing instrument.

Images