JP6202909B2 - Core storage for writing instruments - Google Patents

Description

  The present invention provides a core-exchangeable writing instrument in which a built-in core (batting) can be replaced by attaching and detaching a plug member, or a core with a built-in core in a bottomed cylindrical cylinder, and the opening thereof is closed by a plug member. The present invention relates to a writing instrument core storage body that removably stores a writing instrument core, such as a replacement core set.

Conventionally, in this type of invention, for example, like the one described in Patent Document 1, the barrel (1) and the cursive body (pen body 3) attached to the front end side of the barrel (1) and exposed forward. 4), a substantially cylindrical plug member (rear shaft tube 20) screwed to the rear end of the shaft tube (1), and the plug member (rear shaft tube 20) from within the shaft tube (1). And a long columnar core (batting 2) accommodated inside, and the ink impregnated in the core (batting 2) is guided to the writing body (3, 4).
According to this prior art, when the ink in the core (fill 2) in the shaft cylinder (1) has been consumed, the plug member (rear shaft cylinder 20) is removed and the core ( It is possible to remove the filling 2) and replace this filling (filling 2) with a new filling (filling 2 ') accommodated in the cartridge case (7).

However, in the above prior art, the plug member (rear shaft tube 20) is tightly screwed to the shaft tube (1), and the plug member (rear shaft tube 20) may not be easily loosened. There is. Therefore, if the tightening torque of the plug member (rear shaft cylinder 20) is weakened during assembly, the plug member (rear shaft cylinder 20) may come off during transportation or the shaft cylinder (1) and the plug member (rear) There is a possibility that a gap may be formed between the shaft cylinders 20) and cause ink leakage.
In addition, although the technical field and the solution subject differ from this invention, there exists a thing of patent document 2 as invention which prevents the loosening of a screwing part.

Japanese Patent No. 4522559 Japanese Utility Model Publication No. 53-115274

  The present invention has been made in view of the above-described conventional circumstances, and the problem is that the plug member can be sufficiently tightened and the plug member is prevented from being excessively tightened and coming off. An object of the present invention is to provide a core container for a writing instrument.

  One means for solving the above-described problems includes a substantially cylindrical center core storage member capable of storing the core, and a plug member screwed and connected to an opening on at least one end side of the center core storage member. In the core storage body for a writing instrument that is loosened and can be removed from the core storage member, a recess is provided in one of the core storage member and the plug member, and the other Provided with a projection that fits into the recess when the screw connection is made, and both the recess and the projection are contacted in the central axis direction of the core housing member when the screw connection is made. An abutting surface is provided, and at least one of the recess and the protrusion has a shape that gradually decreases the fitting depth of the recess and the protrusion in the loose rotation direction of the plug member. It is characterized by.

  Since the present invention is configured as described above, it is possible to sufficiently tighten the stopper member and to prevent the stopper member from being excessively tightened and coming off.

It is a perspective view which shows an example of the core exchange-type writing instrument which is a core storage body for writing instruments which concerns on this invention. It is sectional drawing of the same core exchange-type writing instrument. It is sectional drawing which shows an example of the axial cylinder which is a center core accommodating member. It is a rear-end side expanded perspective view of a coaxial cylinder. It is a perspective view which shows an example of a stopper member. It is a side view of the stopper member. It is the figure which looked at the stopper member from the back. It is the figure which looked at the stopper member from the front. It is the (IX)-(IX) sectional view taken on the line of FIG. It is the (X)-(X) sectional view taken on the line of FIG. It is a perspective view which shows an example of the insertion prevention part with which it mounts in a cap. In the same core exchange type writing instrument, it is the whole sectional view showing the state where the plug member and the core were removed. It is sectional drawing which shows an example of the fitting relation of a recessed part and a protrusion. It is a side view which shows an example of the core set for replacement | exchange. It is the figure which looked at the same core set for exchange from the front. It is the (XVI)-(XVI) sectional view taken on the line of FIG. It is sectional drawing which shows the other example of the fitting relationship of a recessed part and a protrusion.

The first feature of the writing instrument core storage unit according to the present embodiment is that the cylindrical core storage member capable of storing the core is screwed into the opening on at least one end side of the core storage member. In the core storage body for a writing instrument comprising the plug member that is loosened so that the plug member can be loosened and removed from the core storage member, one of the core storage member and the plug member, In addition to providing a recess, the other is provided with a protrusion that fits into the recess when the screw connection is made, and both the recess and the protrusion receive the center core when the screw connection is made. An abutting surface that abuts in the central axis direction of the member is provided, and at least one of the recess and the protrusion has a stepped depth in the direction of loosening rotation of the plug member. (See FIG. 13).
Here, the “core” includes a filling made by impregnating ink into a synthetic fiber converged into a cylindrical shape, a core containing ink in a liquid tank, a core for ballpoint pens, a core for mechanical pencils, etc. including.
The “center core storage member” includes a shaft tube of a writing instrument that stores the core, a case for storing the core in the replacement core set, and the like.
Further, the “plug member” includes a bottomed cylindrical tail plug that does not include a cursive body, a cylindrical tip that penetrates the cursive body, and the like.
The “writing instrument core storage body” includes a writing instrument in which the core is removably stored in the shaft cylinder, and a replacement core in which a replacement core (cartridge) is stored in a bottomed cylindrical case. Includes a core set.
According to the above configuration, when the stopper member is screwed and connected to the opening on the one end side of the core housing member, the contact surface on the recess side and the contact surface on the projection side are in contact with each other by tightening rotation and positioned. The plug member is prevented from being excessively tightened.
Further, when the plug member is loosened, its rotational resistance can be reduced stepwise, and the work of loosening the plug member can be facilitated as compared with the case of fitting with a single unevenness.
Therefore, it is possible to sufficiently tighten the plug member and to prevent the plug member from being excessively tightened and coming off.

As a second feature, at least one of the concave portion and the projection is formed with an inclined surface that allows the other to get over the other in the loosening rotation direction when the plug member is loosened (see FIG. 13). ).
According to the above configuration, when removing the plug member from the core housing member, if the plug member is loosened and rotated in the rotation direction, one inclined surface of the concave portion and the protrusion gets over the other. The loose rotation is smoothly performed.

As a third feature, the concave portion includes a first concave portion and a second concave portion that is continuous in the circumferential direction of the first concave portion and is shallower than the first concave portion. A first protrusion that fits into the first recess when the screw connection is made, and a second protrusion that is continuous in the circumferential direction of the first protrusion and fits into the second recess. (See FIG. 13).
According to this structure, the operation | work at the time of loosening a plug member can be performed more favorably.

As a fourth feature, the second recess and the second protrusion are arranged on the loose rotation direction side of the first recess and the first protrusion, and the loose rotation direction on the projecting end side of the second protrusion. An inclined surface extending in the circumferential direction was formed so as to get over the edge of the second recess (see FIG. 13).
According to this configuration, when the plug member is loosened, the inclined surface on the protruding end side of the second protrusion gradually gets over the edge of the second concave portion on the loose rotation direction side. Therefore, the resistance at the time of loosening the plug member can be further reduced, and the work of loosening the plug member can be performed more satisfactorily.

As a fifth feature, when the screw connection is made, the contact surfaces come into contact with each other before exceeding a predetermined screwing amount (see FIG. 13).
According to this configuration, when the plug member is screwed and connected to the core housing member, the abutting surfaces come into contact with each other before exceeding a predetermined screwing amount. Can be prevented.

Further, as a sixth feature, the center core storage member is used as a shaft tube of a writing tool, and the core core is stored in the shaft tube so as to be replaceable, thereby configuring a core-exchangeable writing tool (see FIG. 2). ).
According to this configuration, it is possible to provide a core-exchangeable writing instrument that can be easily exchanged by attaching and detaching the plug member.

It should be noted that the embodiments described later also disclose an invention that does not include a part of the above-described features and that only requires the following constituent elements.
That is, the present invention comprises a substantially cylindrical center core storage member capable of storing a core, and a plug member screwed and connected to an opening on at least one end side of the center core storage member. In the writing instrument core storage body that is loosened and can be removed from the core storage member, one of the core storage member and the plug member is provided with a recess, and the other is screwed together. Protrusions that fit into the recesses when connected are provided, and both the recesses and the protrusions abut the contact surfaces that abut in the central axis direction of the core housing member when the screw connection is made. An inclined surface is formed on at least one of the recess and the protrusion so as to get over the other in the loosening rotation direction when the plug member is loosened.
According to this configuration, when the plug member is screwed and connected to the opening on one end side of the core housing member, the contact surface on the recess side and the contact surface on the projection side are brought into contact with each other by tightening rotation and positioned. The plug member is prevented from being excessively tightened.
Also, when removing the plug member from the core housing member, if the plug member is loosened and rotated in the rotational direction, the slanted surface of one of the recesses and projections will get over the other and rotate loosely. Is done smoothly.
Therefore, it is possible to sufficiently tighten the plug member and to prevent the plug member from being excessively tightened and coming off.

Moreover, in the Example mentioned later, the core replacement | exchange mechanism as an independent invention which does not have the said characteristic is also disclosed.
That is, the present invention is a core replacement mechanism comprising a combination of a core replacement type writing instrument and a replacement core set, wherein the core replacement type writing instrument comprises a core that is detachable in the shaft tube. In addition, the plug member is screwed into the opening at one end thereof, and the replacement core set is detachable from the core storage member having an openable / closable opening and the opening of the core storage member. A plug member mounted and a replacement core housed in the core housing member, and an engaged portion is provided on an end surface in the axial direction of the plug member, and the core core On the outer surface of the storage member or the plug member, there is provided an engaging portion that engages with the engaged portion and can rotate the plug member, and of the engaged portion and the engaging portion, One is formed into a flat plate-like shape, and the other is formed into a concave groove shape that can be engaged and disengaged with the one (FIG. 1). Reference to FIG. 16).
According to this invention, the engaging portion and the engaged portion can be fitted together to loosen or tighten the plug member of the core replacement type writing instrument, or the plug member of the replacement core set, The engagement / disengagement and workability at that time are good.

Next, a preferred embodiment having the above features will be described in detail with reference to the drawings.
In the following description, the axial direction of the cylinder means the direction in which the center line of the core housing member 10 (axial cylinder) extends. Further, “front” means a direction in which the cursive body protrudes on one side in the axial direction of the shaft cylinder. Further, “rear” means a direction opposite to the one side in the axial direction of the shaft cylinder. The “axial cylinder radial direction” means a direction orthogonal to the axial cylinder axis direction. In addition, the “outward direction of the shaft tube diameter” means a direction away from the center of the shaft tube along the shaft tube diameter direction. The “inner cylinder radial direction” means a direction approaching the center of the axial cylinder along the axial cylinder radial direction. In addition, the “slack rotation direction” means a direction in which the plug member 30 is rotated to remove. Further, the “tightening rotation direction” means a direction in which the stopper member 30 is rotated to connect.

  As shown in FIG. 1 and FIG. 2, the writing instrument core storage body 1 includes a core storage member 10 (shaft tube) and a writing body 20 that is attached to the front end side of the core storage member 10 and exposed forward. A substantially bottomed tubular plug member 30 that is detachably attached to the rear end portion of the core housing member 10, and a long cylindrical medium housed from the core housing member 10 to the plug member 30. A core replacement including a core 40 and a cap 50 detachably mounted on the front end side of the core storage member 10 so as to cover the writing body 20 and guiding the ink impregnated in the core 40 to the writing body 20 It constitutes a formula writing instrument.

  The center core storage member 10 includes a front end 11 having a tapered shape and a long cylindrical cylindrical main body 12 extending rearward of the front end 11, and a center replaceable writing instrument. (Refer to FIG. 3).

  A plurality of vertical ridges 11 a are provided on the inner peripheral surface of the front end portion 11 on the front end side at intervals in the circumferential direction. These vertical protrusions 11a hold the outer peripheral surface of the writing body 20 by the protruding ends in the axial direction of the shaft cylinder (see FIG. 2). Further, the space between the longitudinal ridges 11a, 11a adjacent to each other in the circumferential direction is used as an air passage that ensures air permeability inside and outside the core housing member 10.

In addition, a plurality of receiving piece portions 11b are provided at intervals in the circumferential direction so as to receive the front end of the center core 40 on the rear side of the vertical protrusion 11a in the leading end portion 11.
These receiving piece portions 11 b are projecting piece-like members that protrude in the radially inward direction from the inner peripheral surface near the rear half of the leading end portion 11, and are close to the outer peripheral surface of the writing body 20. That is, a gap is provided between each receiving piece portion 11 b and the outer peripheral surface of the writing body 20.
The space between the receiving portions 11b, 11b adjacent in the circumferential direction is an ink storage portion 11c that temporarily stores the ink when the ink in the core 40 is suddenly ejected due to a drop impact or the like. Function.

A plurality of vertically long core fitting protrusions 12a that press and hold the core 40 in the axial direction are arranged in the circumferential direction near the front opening 11 in the cylindrical main body 12 (see FIG. 2 and FIG. 2). (See FIG. 3).
Each core fitting projection 12a is formed in a flat plate shape elongated in the axial direction, and its front end is connected to the rear end of the receiving piece 11b. A convex chamfered chamfered portion 12a1 (see FIG. 3) is formed on the rear end side of the center core fitting protrusion 12a so that the center core 40 is smoothly guided forward. In addition, as another example of the chamfered portion 12a1, it is also possible to form a flat surface that is inclined.

  Further, near the rear end in the cylindrical main body portion 12, a female screw portion 12b for screwing and connecting the plug member 30, and a plug member 30 in pressure contact with the plug member 30 on the front side of the female screw portion 12b are accommodated. An annular convex portion 12c that seals the rear end side of the member 10 and a concave portion 12d that fits into a protrusion of the plug member 30 described later on the rear side of the female screw portion 12b are provided (see FIG. 3).

  As shown in FIGS. 4 and 13, the concave portion 12d on the rear end side of the cylindrical main body portion 12 includes a first concave portion 12d1 and a second concave portion 12d2 continuous in the circumferential direction of the first concave portion 12d1. Then, the fitting depth with the protrusion 35 on the plug member 30 side is formed in a staircase shape that gradually decreases in the loose rotation direction of the plug member 30 (upward according to FIG. 13).

The first recess 12d1 is a recess that is long in the circumferential direction, and the end surface on the tightening rotation direction side of the plug member 30 is connected to the contact surface 35a1 on the plug member 30 side when the plug member 30 is screwed and connected. On the other hand, the contact surface 12d11 is a flat surface that contacts each other in the axial direction (see FIG. 13).
Further, the bottom portion 12d12 (left end surface according to FIG. 13) of the first recess 12d1 is formed in a flat surface shape substantially orthogonal to the axis of the core housing member 10, and the second portion is interposed via the inclined surface 12d13. It is connected to the bottom 12d21 of the recess 12d2.
The inclined surface 12d13 is formed in a flat surface shape extending in the slack rotation direction (in the diagonally upper right direction according to FIG. 13) inclined to the rear of the shaft cylinder so that the stopper member 30 gets over when the stopper member 30 is loosened. .

The contact surface 12d11 on the front end side in the first recess 12d1 is formed in a flat surface shape substantially parallel to the axial direction of the shaft cylinder. The contact surface 12d11 is configured so that when the plug member 30 is screwed and connected to the core housing member 10, the contact surface 12d11 contacts the contact surface 35a1 on the plug member 30 side before exceeding a predetermined screwing amount. The position is set.
Here, the predetermined screwing amount is such that there is no visible gap between the core housing member 10 and the plug member 30, the airtightness between them is maintained, and the plug member is used for replacing the core. It is appropriately set to such an extent that 30 can be loosened.

The second recess 12d2 is a recess that is shallower than the first recess 12d1 and is long in the circumferential direction. The bottom 12d21 (the left end surface according to FIG. 13) is connected to the axis of the core housing member 10. It is formed in a flat surface shape that is substantially orthogonal to the center.
In the second recess 12d2, an inclined surface 12d22 is formed at the end of the plug member 30 on the loosening direction side. The inclined surface 12d22 is formed in a flat surface shape extending in the loose rotation direction (in the diagonally upper right direction according to FIG. 13) inclined rearward of the shaft cylinder so that the stopper member 30 can get over when the stopper member 30 is loosened. The

Further, the writing body 20 may be configured so that the rear end portion thereof is press-fitted into the front end portion of the core 40 (see FIG. 2) and the ink impregnated in the core 40 is guided forward by capillary force. It is formed in a substantially shaft shape made of a quality resin or a substantially shaft shape formed by converging a large number of synthetic fibers.
In addition, according to the example shown in FIG. 2, the cursive body 20 has an exposed portion on the front end side of the cursive body 20 formed in a cannonball shape, but as another example, it may be a wedge shape that is cut obliquely. Is possible.

  The plug member 30 is a bottomed cylindrical member that is detachably attached to the rear end opening of the core housing member 10. On the front side of the outer peripheral surface of the plug member 30, a male screw part 31 that can be screwed into the female screw part 12b on the rear end side in the core housing member 10 is formed, and on the rear side of the male screw part 31, An annular flange portion 32 that is in contact with the rear end face of the core housing member 10 is formed. Around the flange portion 32, a plurality of convex portions 32a functioning as rolling prevention of the core-type writing instrument and preventing slippage when removing the plug member 30 are provided at intervals in the circumferential direction.

Further, the front end surface of the flange portion 32 is provided with a protrusion 35 that fits into the recess 12d at the rear end of the core housing member 10 when the plug member 30 is screwed to the core housing member 10.
As shown in FIG. 13, the projection 35 is continuous with the first projection 35a fitted in the first recess 12d1 on the core housing member 10 side, and in the circumferential direction of the first projection 35a, and the core housing. A second protrusion 35b that fits into the second recess 12d2 on the member 10 side, and the fitting depth with the recess 12d on the core housing member 10 side is set to the loose rotation direction of the plug member 30 (see FIG. 13). According to this, it is formed so as to become shallower stepwise in the upward direction).

The first protrusion 35 a is a convex portion that is long in the circumferential direction, and its end surface on the tightening rotation direction side is brought into contact with the contact surface 12 d 11 on the core housing member 10 side when the plug member 30 is screwed and connected. A flat contact surface 35a1 is in contact with each other. Further, the projecting end portion 35 a 2 (left end surface according to FIG. 13) of the first projection 35 a is formed in a flat surface shape that is substantially orthogonal to the axial center of the core housing member 10.
And the protrusion part 35a2 of the 1st protrusion 35a is connected to the inclined surface-shaped protrusion part 35b1 of the 2nd protrusion 35b via the inclined surface 35a3.
In addition, the inclined surface 35a3 is formed in a flat surface shape extending obliquely rearward at a steeper angle than the protruding end portion 35b1 in the loose rotation direction of the plug member 30.

  The second protrusion 35b is an inclined surface-shaped protrusion having a smaller forward protrusion dimension from the entire end face of the flange portion 32 than the first protrusion 35a. If it demonstrates in detail, the protrusion part 35b1 of the 2nd protrusion 35b is formed in the gentle inclination flat surface shape which continues diagonally back in the loose rotation direction of the plug member 30. As shown in FIG.

  A plurality of core holding protrusions 33 (see FIGS. 8 to 10) that are in contact with the outer peripheral surface of the core 40 and hold the core 40 are provided on the front side of the inner peripheral surface of the plug member 30. A plurality of receiving pieces 34 for receiving the rear end surface of the core 40 are provided on the inner side of the inner peripheral surface 30 behind the core holding protrusion 33.

  Each of the core holding projections 33 has a radially inward protruding end surface formed into a curved surface shape or a flat surface shape (in accordance with a preferred example shown in FIG. 8) that follows the outer peripheral surface of the core core 40. The contact area of the protruding end surface that contacts the core 40 is formed in a substantially V shape in plan view that increases in the direction in which the core 40 is inserted into the plug member 30 (hereinafter referred to as the center core insertion direction). (Refer to FIG. 10). This shape suppresses the outflow of ink due to the pressing of the core, and improves the workability when the core is assembled or the core is replaced.

Further, a chamfered portion 33a having a convex curved surface is provided on the front end side of the core holding projection 33 so as to smoothly guide the inserted core 40 without resistance.
A plurality of the core holding projections 33 are provided at predetermined intervals in the axial direction of the shaft cylinder, and the projecting end inner diameters a of the plurality of core holding projections 33 (in detail, as shown in FIG. The inner diameter of the portion on the rear side from 33 a is set to a diameter slightly smaller than the outer diameter of the center core 40.
If it demonstrates in detail, the said internal diameter a will be small gradually toward the back | inner side (the right side according to FIG. 9) in the stopper member 30, although it is little. That is, the height in the radial direction of each core holding projection 33 gradually increases toward the back side.

Further, according to the illustrated example, the inner diameter a is set slightly smaller than the inner diameter of the radially inward protruding ends of the plurality of center core fitting protrusions 12a on the center core storage member 10 side.
That is, the holding force for the core 40 by the core holding protrusion 33 on the plug member 30 side is larger than the holding force for the core 40 on the core housing member 10 side.

Further, the receiving piece portion 34 is provided on the back side of the core holding projection 33 so as to extend rearward from the rear end of the core holding projection 33 and to protrude radially inward from the core holding projection 33. A plurality of receiving pieces 34 are provided at predetermined intervals in the circumferential direction at the same intervals as the plurality of core holding projections 33.
And the front-end part of the some receiving piece part 34 receives the rear-end surface of the center core 40. FIG. Further, the space s between the adjacent receiving piece portions 34, 34 in the circumferential direction functions as an air passage for supplying air into the core 40 as the ink in the core 40 is consumed. When ink in the core 40 suddenly flows backward due to a drop impact or the like, it also functions as an ink reservoir that temporarily stores the ink.

  In more detail, the air passage is described in detail between the longitudinal protrusions 11a and 11a on the front end side of the center core storage member 10, between the receiving pieces 11b and 11b, between the center core fitting protrusions 12a and 12a, and the cylindrical body. The gap between the inner peripheral surface of the portion 12 and the outer peripheral surface of the core 40, the gap between the inner peripheral surface of the plug member 30 and the outer peripheral surface of the core 40, and the continuous space s between the receiving pieces 34 and 34 in the plug member 30. It is a passage to do. Further, the air passage communicates with the rear end surface of the core 40 as described above, but also communicates with the front end surface of the core 40.

  Further, the rear end face of the plug member 30 is provided with an engaged portion 36 that is used as necessary when the plug member 30 is attached and detached. The engaged portion 36 is formed in a concave groove shape that opens rearward and is long in the radial direction, and can be engaged with an engaging portion 61 of a coin or the replacement core set 2 described later.

  The inner core 40 is configured by accommodating a large number of synthetic fibers in a thin cylindrical body made of synthetic resin and impregnating the inside thereof with ink. The inner core 40 may be referred to as batting.

  Further, as shown in FIG. 2, the cap 50 has a double cylindrical cap main body 51 and a substantially conical shape that prevents insertion of the writing body 20 between the inner cap 51a and the outer cap 51b in the cap main body 51. It is comprised integrally from the shape insertion prevention part 52, and is fitted by the front-end | tip part 11 so that attachment or detachment is possible.

The cap main body 51 includes a small-diameter cylindrical inner cap 51a provided so as to cover the periphery of the writing body 20, and an outer cap 51b provided at an outer peripheral side with respect to the inner cap 51a. It is integrally formed into a double cylinder (see FIG. 2).
The inner cap 51 a is formed in a cylindrical shape that is slightly larger than the small-diameter cylindrical portion on the front end side of the front end portion 11, and the inner peripheral surface on the rear end side is in close contact with the front end side outer peripheral surface of the front end portion 11. To prevent ink leakage.

The outer cap 51b is formed in a cylindrical shape with a bottom, and a peripheral wall is provided with a deformable portion 51b1 that can be elastically bent and deformed into the cap by a pressing operation from the outside.
The outer surface of the deformable portion 51b1 is provided so as to be substantially flush with the maximum diameter portion of the outer peripheral surface of the outer cap 51b, or recessed from the maximum diameter portion. In other words, the deformable portion 51b1 is provided so as not to protrude in the radially outward direction from the maximum diameter portion on the outer peripheral surface of the outer cap 51b.

The deformable portion 51b1 is a cantilever beam formed inside the notch 51b2 by providing a substantially U-shaped notch 51b2 in plan view that penetrates the peripheral wall of the cap body 51 in the radial direction of the cap. (See FIGS. 1 and 2), and the free end portion on the opposite end side (the right end side according to FIG. 2) with respect to the base end side is directed to the rear of the shaft cylinder (right side in the figure) .
According to the illustrated example, two notches 51b2 and deformed portions 51b1 are provided so as to face each other with the axis therebetween (see FIG. 2).

Each deforming portion 51b1 presses the inclined surface 11d of the leading end portion 11 by the inner edge on the free end side (the right end side according to FIG. 2) when deforming to the inside of the cap.
In FIG. 1, reference numeral 51b11 is a non-slip protrusion located on the surface of the deformable portion 51b1 on the free end side.

  Further, when the cap 50 is fitted to the core storage member 10 (shaft cylinder) on the opening end side (right end side according to FIG. 2) of the inner peripheral surface of the cap main body 51, the core storage member 10 side is arranged. A climbing projection 51i is provided so as to climb over the annular projection 11e in the axial direction. The climbing protrusion 51i is a protrusion having a gently sloping surface and a plurality of cross-sectional protrusions 51i.

  A plurality of vertical ribs 51j extending in the cap axial direction are provided on the inner peripheral surface of the cap main body 51 at substantially equal intervals in the circumferential direction. The plurality of vertical ribs 51j disperse the contact force between the inner peripheral surface of the cap 50 and the outer peripheral surface of the core housing member 10 substantially evenly in the circumferential direction, so that the inner peripheral surface of the cap 50 and the outer periphery of the core housing member 10 are Hold the surface in stable contact.

  Further, as shown in FIG. 11, the insertion preventing portion 52 includes a connecting portion 52a connected to the inner cap 51a and a guide portion 52b extending from the connecting portion 52a.

  The connecting portion 52a is formed in a substantially cylindrical shape along the outer peripheral surface of the inner cap 51a. The inner peripheral surface is fixed so as not to move in the axial direction and the circumferential direction by pressing the inner peripheral surface against the outer peripheral portion of the inner cap 51a. (See FIGS. 2 and 11).

Moreover, the guide part 52b is formed in the substantially cone cylinder shape diameter-reduced ahead so that the writing body 20 may be guided in the inner cap 51a.
According to the illustrated example, the free end portion of the guide portion 52b is in contact with or close to the inner surface of the deformable portion 51b1 (in accordance with an example of FIG. 2). The guide portion 52b is provided with a plurality of slits 52b1 having a width incapable of inserting the writing body 20 at intervals in the circumferential direction so as to divide the guide portion 52b in the circumferential direction. These slits 52b1 facilitate the elastic deformation of the guide portion 52b in the radially inward direction accompanying the deformation of the deformable portion 51b1 in the radially inward direction.

Next, the characteristic effect of the core storage body 1 for a writing instrument having the above-described configuration (core-exchangeable writing instrument) will be described in detail.
When the plug member 30 is connected to the opening on the rear end side of the core housing member 10 for manufacturing the core housing body 1 for the writing instrument, replacing the core 40, etc., The plug member 30 is inserted into the rear end and rotated and tightened. When a predetermined screwing amount is reached during this tightening, the contact surface 12d11 (see FIG. 13) of the recess 12d on the core housing member 10 side and the contact surface 35a1 of the projection 35 on the plug member 30 side are contacted. They are positioned in contact with each other to prevent the plug member 30 from being excessively tightened and becoming difficult to come off.

Further, when removing the plug member 30 from the core housing member 10, if the plug member 30 is loosened and rotated in the rotation direction, the inclined surface of the second protrusion 35b on the plug member 30 side as shown in FIG. The projecting end 35b1 gradually climbs on the loose rotation direction side edge of the second recess 12d2 on the core housing member 10 side, and the second protrusion 35b on the plug member 30 side becomes the core housing member 10 It escapes from the second concave portion 12d2.
The inclined surface 35a3 on the plug member 30 side is in sliding contact with the inclined surface 12d13 on the core housing member 10 side, and the first protrusion 35a on the plug member 30 side is the first recess on the core housing member 10 side. Get out of 12d1. Further, the first protrusion 35a advances along the bottom surface of the second recess 12d2 on the core housing member 10 side, comes into sliding contact with the inclined surface 12d22, and exits from the recess 12d.
As described above, since the protrusion 35 on the plug member 30 side comes out stepwise from the recess 12d on the core housing member 10 side, the loose rotation of the plug member 30 proceeds, so that the rotational resistance is relatively small. The rotation is performed smoothly. And in the state which removed the plug member 30 from the core storage member 10, as shown in FIG. 12, the core 40 fitted in the plug member 30 can also be removed together.

  Therefore, it is possible to sufficiently tighten the plug member 30 so as not to cause unintended loosening and ink leakage, and it is possible to prevent the plug member 30 from being excessively tightened and coming off. The feeling of operation when loosening the plug member 30 can be improved, and the replacement work of the core 40 can be performed quickly and easily.

  The plug member 30 can be attached and detached by an operation of turning the plug member 30 by hand. If necessary, a coin or a replacement core to be described later can be attached to the engaged portion 36 at the rear end of the plug member 30. The engaging portion 61 of the set 2 can be inserted, and the plug member 30 can be attached and detached by rotating the coin or the replacement core set 2.

  Further, as another characteristic action and effect, when the cap 50 is removed from the core housing member 10, when the deforming portion 51b1 is picked and pressed by a finger, the deforming portion 51b1 bends in the radially inward direction. . At this time, along with the bending of the deforming portion 51b1, the guide portion 52b of the insertion preventing portion 52 is also bent in the radially inward direction. The guide part 52b is elastically deformed smoothly and smoothly while bringing the rear end part into sliding contact with the inner surface of the deforming part 51b1 and narrowing each slit 52b1.

  The deformed deformed portion 51b1 slides the inner core storage member 10 rearward by bringing the inner edge of the free end into sliding contact with the inclined surface 11d on the distal end side of the intermediate core storage member 10. Therefore, the over-fitting state between the over-projection protrusion 51 i (see FIG. 2) on the inner peripheral surface of the outer cap 51 b and the annular protrusion 11 e on the outer peripheral surface of the center core storage member 10 is released, and the cap 50 moves forward from the center core storage member 10. Get off.

  Therefore, according to the writing instrument core housing 1 (core-exchangeable writing instrument) configured as described above, the cap 50 can be prevented from coming off due to contact with the desk surface or the like when not in use. The cap 50 can be removed by a relatively light picking operation.

  Next, the replacement core set 2 (see FIGS. 14 to 16) that constitutes the core replacement mechanism by combining with the writing instrument core storage body 1 (core replacement type writing instrument) will be described.

  As shown in FIG. 16, the replacement core set 2 includes a core storage member 60 having an opening that can be opened and closed, a plug member 70 that is detachably attached to the opening of the core storage member 60, and And a replacement core 40 ′ housed in the core housing member 60.

  The core storage member 60 is a bottomed cylindrical member that can store one end side portion of the replacement core 40 '(see FIG. 16), and on the outer surface of the bottom wall, the core storage body 1 for a writing instrument. It has the engaging part 61 which can be fitted / removed to the to-be-engaged part 36 of (core exchange type writing instrument). In addition, a protrusion 62 is formed on the inner peripheral surface on the opening side of the core housing member 60 to fit over the plug member 70 to be attached and detached.

  The engaging portion 61 is formed in a flat plate-like shape that protrudes in the axial direction from the end surface of the core housing member 60. The engaging portion 61 has substantially the same shape as the inner surface of the recessed groove-like engaged portion 36 of the writing instrument core housing 1 and is formed to be detachable from the engaged portion 36.

The plug member 70 is a bottomed cylindrical member that can accommodate the other end side portion of the replacement core 40 ′, and is attached to the other end side of the core 40 ′. It is inserted and fitted into the opening.
On the outer peripheral surface of the plug member 70 on the opening side (left side according to FIG. 16), there is a protrusion 71 that fits over the protrusion 62 on the inner surface of the core housing member 60, or the opening side of the protrusion 71. An annular protrusion 72 or the like is provided that contacts the inner peripheral surface of the core housing member 60 and maintains the airtightness in the core housing member 60.
A plurality of protrusions 73 extending in the axial direction are provided on the inner peripheral surface of the plug member 70 at intervals in the circumferential direction. These protrusions 73 are gently pressed against the outer peripheral surface of the core 40 '.

  14 to 16, reference numerals 63 and 74 denote a plurality of recesses that prevent slipping when the plug member 70 is removed from the core housing member 60.

Therefore, according to the replacement core set 2 configured as described above, if the plug member 70 is removed from the core housing member 60, the core 40 ′ is also pulled out of the core housing member 60 while being held by the plug member 70. Can do.
Further, as described above, the engaging portion 61 of the replacement core set 2 is fitted to the engaged portion 36 at the rear end of the plug member 30 on the core housing member 10 side, and the replacement core set 2 is rotated. It is also possible to turn the plug member 30 by operation to attach or detach it. The work at this time has good workability because the replacement core set 2 can be gripped with a hand like a driver and rotated with a fingertip.

In addition, according to the said Example, although the protrusion 35 by the side of the plug member 30 was fitted in the recessed part 12d by the side of the core storage member 10 (core writing instrument), as another example, it illustrates in FIG. Thus, it is also possible to reverse the concavo-convex relationship.
In the other example shown in FIG. 17, the core storage member 10 side (left side in the drawing) has a projection 35 having the same configuration as that of the above embodiment, and the core storage member 10 side has A recess 12d having the same configuration is provided. The plug member 30 can be tightened sufficiently so that it does not come off or cause ink leakage, and the plug member 30 is tightened too much so that it does not come off. Can be prevented.

  Further, according to the above embodiment, the inclined surfaces of the inclined surfaces 12d13, 12d22, 35a3 and the protrusions of the second protrusion 35b are flat inclined surfaces. It can also be a curved inclined surface.

  Moreover, according to the said Example, although the recessed part 12d and the processus | protrusion 35 were comprised by the two-step 1st and 2nd recessed part 12d1 and 12d2, and the two-stage 1st and 2nd processus | protrusions 35a and 35b, respectively. As another example, the recess 12d and the protrusion 35 can each be configured in a stepped shape having three or more steps.

  Moreover, according to the said Example, although the recessed part 12d and the protrusion 35 were provided in one place in the circumferential direction, as another example, it is also possible to provide two or more these recessed parts 12d and the protrusions 35 at intervals in the circumferential direction. It is.

  Moreover, according to the said Example, although the center core 40 was made into the batting which consists of a some synthetic fiber, as another example of the center core 40, the aspect which accommodated the ink in the hollow liquid tank, or for ball-point pens It is also possible to adopt an aspect in which an intermediate core is configured, an aspect in which an intermediate core for a mechanical pencil is configured, and the like.

  Moreover, according to the said Example, while providing the concave to-be-engaged part 36 in the center core container 1 (core center exchange-type writing instrument) side for writing instruments, and the convex engaging part 61 in the center core set 2 side for replacement | exchange. However, as another example, the concavo-convex relationship can be reversed.

  Moreover, according to the said Example, although the engaging part 61 was provided in the bottom wall outer surface of the core storage member 60 in the replacement core set 2, as another example, the plug member 70 in the replacement core set 2 is provided. It is also possible to adopt a mode in which a similar engaging portion is provided on the outer surface of the bottom wall, a mode in which similar engaging portions are provided in both the core housing member 60 and the plug member 70, or the like.

  Moreover, according to the said Example, although the said recessed part 12d and the said protrusion 35 were comprised between the center core storage member (shaft cylinder) 10 and the plug member 30, as another example, a shaft cylinder, this shaft, In a writing instrument having a tip as a plug member that can be screwed to a cylinder, a recess and a protrusion having substantially the same configuration as the recess 12d and the protrusion 35 are provided between the shaft cylinder and the tip. It is also possible to provide (not shown).

  Moreover, according to the said Example, although the said recessed part 12d and the said protrusion 35 were provided between the flange part 32 of the plug member 30, and the center core storage member 10 rear end, as another example, it is substantially the same structure. It is also possible to provide the concave portion and the protrusion between the front side of the male screw portion 31 of the plug member 30 and the core housing member 10 or at other portions.

  Moreover, according to the said Example, although it was set as the structure which inserts the plug member 30 in the rear-end side of the center core storage member 10, as another example, the plug member 30 is cyclic | annular in the rear-end side of the center core storage member 10. In addition, the concave portion 12d and the protrusion 35 having the above-described configuration may be provided between the rear end surface of the core housing member 10 and the bottom surface in the plug member 30.

  Further, in the replacement core set 2 of the above-described embodiment, the possibility of removing the plug member 70 is less than in the case of the writing instrument core storage body 1 (core-exchangeable writing instrument). However, as another example, the replacement core set 2 is also provided with the recess 12d and the protrusion 35 having the above-described configuration between the core housing member 60 and the plug member 70. The plug member 70 can be easily attached and detached.

1: Core storage for writing utensils (core-exchangeable writing utensils)
2: Replacement core set 10: Core storage member (shaft tube)
20: Cursive body 12d: Recess 12d11, 35a1: Contact surface 12d13, 12d22, 35a3: Inclined surface 30: Plug member 35: Projection 35a: First projection 35b: Second projection 35b1: Projection end (inclined surface)
40, 40 ': Core 50: Cap

Claims (6)

A substantially cylindrical center core storage member capable of storing a center core; and a plug member screwed and connected to an opening on at least one end side of the core core storage member. In the core storage body for writing instruments that can be removed from the storage member,
While providing a recess in one of the core housing member and the plug member, the other is provided with a protrusion that fits into the recess when the screw connection is made,
Both the recess and the protrusion are provided with contact surfaces that come into contact with each other in the central axis direction of the core storage member when the screw connection is made.
At least one of the recess and the protrusion has a shape that gradually decreases the fitting depth of the recess and the protrusion in the loosening rotation direction of the plug member. body.   2. The writing instrument according to claim 1, wherein at least one of the recess and the protrusion is formed with an inclined surface that allows the other of the stopper member to get over in the loosening rotation direction when the plug member is loosened. Medium core storage body. The recess comprises a first recess and a second recess that is continuous in the circumferential direction of the first recess and shallower than the first recess.
The protrusion has a first protrusion that fits in the first recess when the screw connection is made, and a second protrusion that is continuous in the circumferential direction of the first protrusion and fits in the second recess. The core container for a writing instrument according to claim 1, further comprising a protrusion.   The second concave portion and the second protrusion are disposed on the loose rotation direction side of the first concave portion and the first protrusion, and the second concave portion and the second protrusion are arranged on the protruding end side of the second protrusion in the loose rotation direction. 4. The core storage body for a writing instrument according to claim 3, wherein an inclined surface extending in the circumferential direction is formed so as to get over the edge.   5. The writing instrument or the writing instrument according to claim 1, wherein the contact surfaces come into contact with each other before exceeding a predetermined screwing amount when the screw connection is made. Medium core storage body.   6. The center core exchangeable writing instrument is configured by using the center core storage member as a shaft cylinder of a writing instrument, and storing the core core in a replaceable manner in the shaft cylinder. The core storage body for writing instruments according to the item.

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