JP5731556B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument having a shaft cylinder provided with a knock mechanism that can be attached / detached to any one of fluid pencils such as a mechanical pencil, a ballpoint pen, a marker pen, and a correction pen as a refill.

  Ballpoint pens and mechanical pencils are widely used as writing instruments in which the writing tip moves out and out by a knock mechanism. These may be provided as writing instruments having independent single functions, or may be provided as multifunctional writing instruments in which they are housed in a single shaft. Recently, not only the ballpoint pen but also the mechanical mechanism of the mechanical pencil has been refilled, and the shaft tube is used as a common member, and the user can wear a ballpoint refill of the favorite color in it, or alternatively, a sharp There are also writing instruments that can be customized with a pencil refill. As one such writing instrument, an invention described in Patent Document 1 below is disclosed.

JP 2007-50610 A

In the customizable knock-type writing instrument as in the prior art, it is necessary to provide a knock mechanism on the refill side in both the case of the ballpoint pen refill and the case of the mechanical pencil refill. In particular, in the case of a ballpoint pen, the refill is a consumable member that is exchanged when the ink is consumed. Therefore, if a knock mechanism must be provided there, the refill structure becomes complicated and disadvantageous in terms of cost. However, since it is necessary to standardize the refill, it is also necessary to share some structure between the ballpoint pen refill and the mechanical pencil refill.
Therefore, the present invention provides a refill structure as much as possible in a knock-type writing instrument that can be customized to a mechanical pencil, a ballpoint pen, or other writing instrument or applicator, such as a marker pen or a correction pen, depending on the user's preference or selection. It is an object to simplify and make it possible to exchange refills at a lower cost and easily.

In view of the above problems, the present invention provides a shaft cylinder 20 having openings 22, 24 at the front end and the rear end, and
A writing member 70 having a writing tip 82 housed in the shaft cylinder 20 and retractable from the opening 22 at the tip;
The writing instrument 10 having a knock mechanism 30 provided with a knock member 40 at the rear of the shaft cylinder 20,
The knock mechanism 30 is
The knock member 40;
A rotating member 50 that is positioned on the distal end side of the knock member 40 and is rotatable in a predetermined circumferential direction in accordance with the forward pressing of the knock member 40;
A cam mechanism 60 provided on an inner peripheral surface near the rear end of the shaft cylinder 20,
A return spring 26 for always urging the rotating member 50 backward;
With
The knock member 40 has a sliding protrusion 41 provided so as to protrude on the outer surface thereof,
The rotating member 50 has a sliding ridge 51 that protrudes on the outer surface and extends in the axial direction and has a rear end edge that is inclined in the distal direction toward the opposite direction of the rotating direction,
The cam mechanism 60 is
A locking protrusion 61 provided on the inner peripheral surface near the rear end of the shaft tube 20 and extending in the axial direction and provided in a plurality of sets and the like.
Cam grooves 64 formed as grooves between the locking protrusions 61;
Have
In the cam groove 64, the sliding protrusion 41 and the sliding protrusion 51 can slide back and forth in the axial direction,
Of the leading edge of the locking ridge 61, the portion of the cam groove 64 positioned on the rotational direction side is inclined toward the rear end toward the rotational direction, so that the rear of the sliding ridge 51 Formed as a locking edge 62 whose end edge is lockable,
Of the leading edge of the locking protrusion 61, the portion of the cam groove 64 located on the opposite side to the rotational direction side is located closer to the distal end than the locking edge 62 and faces in the rotational direction. Is formed as a guide edge 63 that guides the sliding protrusion 51 to the cam groove 64 by inclining in the rear end direction,
As the writing member 70, a mechanical pencil refill 80 provided with a chuck mechanism 86 for feeding out a core 88 as the writing tip 82 is accommodated in the shaft cylinder 20,
Along with the forward pressing of the knock member 40, the sliding protrusion 51 is pushed forward by the sliding protrusion 41 in the cam groove 64, so that the rotating member 50 also moves forward,
The rear end edge of the sliding protrusion 51 climbs over the engaging edge 62 of the engaging protrusion 61,
The sliding ridge 51 moves along the inclination of the locking edge 62,
By completely engaging the sliding protrusion 51 and the locking edge 62, the writing tip 82 of the mechanical pencil refill 80 protrudes from the opening 22 at the tip,
Further, even if the knock member 40 is pressed forward, the sliding protrusion 51 cannot get over the step between the locking edge 62 and the guide edge 63.
Further, in addition to the above-described features, the present invention provides, as the writing member 70, a fluid containing tube 91 that contains a fluid 92 instead of the mechanical pencil refill 80, and the application by which the fluid 92 is applied. A coating refill 90 having a tip 93 can be accommodated in the shaft cylinder 20, and
When the coating refill 90 is accommodated in the shaft cylinder 20,
Along with the forward pressing of the knock member 40, the sliding protrusion 51 is pushed forward by the sliding protrusion 41 in the cam groove 64, so that the rotating member 50 also moves forward,
The rear end edge of the sliding protrusion 51 climbs over the engaging edge 62 of the engaging protrusion 61,
The sliding protrusion 51 moves along the inclination of the locking edge 62,
The application tip 93 of the application refill 90 protrudes from the opening 22 at the tip by completely engaging the sliding ridge 51 and the locking edge 62,
Further, when the knock member 40 is pressed forward, the step over the step edge between the locking edge 62 and the guide edge 63 is overcome, reaches the guide edge 63, reaches the cam groove 64 along the inclination of the guide edge 63, and the coating. The tip 93 is completely retracted into the shaft cylinder 20.
Further, according to the present invention, in addition to the above features, a spring support member 25 is provided inside the shaft tube, and the return spring 26 is interposed between the spring support member 25 and the rotation member 50. It is characterized by.

In the “writing instrument 10” of the present invention, either the “mechanical pencil refill 80” or the “application refill 90” is accommodated in the “shaft cylinder 20” as the “writing member 70”, and the “writing tip 82” or “ The application tip 93 "can be operated by the" knock mechanism 30 "provided on the shaft cylinder 20 side. The “tip” in the present invention is the side where the writing tip 82 of the writing instrument 10 is located, and “front” means a direction toward this “tip”, and “rear end” and “rear” are respectively The opposite is the case.
Here, the “coating refill 90” can be various depending on the type of the “fluid 92”. For example, when ballpoint pen ink is accommodated as the fluid 92, the application refill 90 becomes a ballpoint pen refill 90a having a ballpoint pen tip 93a holding a writing ball 93b as the application tip 93. When marker pen ink is accommodated as the fluid 92, the coating refill 90 is a marker pen refill in which a coating tip 93 is formed of, for example, a fiber bundle. Further, when a correction liquid used for correction of typographical errors and typographical errors is stored as the fluid 92, the application refill 90 is, for example, a correction pen refill having an application tip 93 provided with a ballpoint pen tip-like writing ball as an application body. It becomes. In the present invention, “application” is used as a concept including “writing”.

The “shaft cylinder 20” is a member constituting the outside of the writing instrument 10, and any one of the writing members 70 is formed so as to be arbitrarily attached. For example, it is desirable that the two members of the front end side and the rear end side are screwed together and configured so that the writing member 70 can be mounted or replaced by disassembling them. Openings 22 and 24 are provided at both ends of the shaft cylinder 20, respectively, and a “writing tip 82” or “application tip 93” described later can be withdrawn / retracted from the opening 22 on the tip side. Further, a part of a “knock mechanism 30” to be described later can be withdrawn from the opening 24 on the rear end side.
The “knock mechanism 30” is a mechanism for operating the writing tip 82 of the writing member 70. Specifically, when the writing member 70 is a ballpoint pen refill 90a, the ballpoint pen tip 93a is withdrawn / retreated by operating the knock mechanism 30. Further, when the writing member 70 is the mechanical pencil refill 80, the lead 88 is fed out by the operation of the knock mechanism 30.

The knock mechanism 30 includes a “cam mechanism 60” as a structure provided on the shaft cylinder 20 side, and a “knock member 40”, a “rotating member 50”, and a “return spring 26” that are separate members from the shaft cylinder 20. Is a mechanism that includes Here, even if the cam mechanism 60 is integrally formed on the inner peripheral surface of the shaft cylinder 20, it is formed as a separate member and is inserted into the corresponding position on the inner peripheral surface of the shaft cylinder 20. It may be either fixed or fixed.
The “cam mechanism 60” exists by forming a “locking ridge 61” as a ridge protruding inward on the inner peripheral surface in the vicinity of the rear end of the shaft cylinder 20 and the locking ridge 61. And a “cam groove 64” as a groove. The leading edge of the “locking protrusion 61” is inclined in a certain direction with respect to the circumference of the shaft cylinder 20, and a portion on the positive direction side with respect to the “constant direction” is It is located on the tip side from the part on the opposite direction side. That is, when the tip edge of the locking ridge 61 is viewed along the “certain direction”, a portion (“locking edge 62”) positioned more rearward next to the cam groove 64 comes first, Then, a portion (“guide edge 63”) located on the front side comes next, and the next cam groove 64 comes again.

The “knock member 40” is usually moved out of the opening 24 at the rear end of the barrel 20 when the user presses a structure called a “knock button 42” or the like that constitutes the rearmost end of the “knock member 40”. The writing tip 82 and the coating tip 93 are operated to be withdrawn and retreated through this operation. A “sliding protrusion 41” that slides along the cam groove 64 is provided on the outer peripheral surface of the knock member 40. This function will be described later.
The “rotating member 50” is a member that rotates in the “constant direction” in the description of the cam groove 64 when pressed by the knock member 40. The rotating member 50 is provided with a “sliding protrusion 51” that slides along the cam groove 64 and can be detached from the cam groove 64 and locked with the locking edge 62. Further, it is desirable that the writing member 70 is attached to the tip portion of the rotating member 50. Here, as a mounting method, for example, a “refill mounting hole 52” may be provided in the axial center portion of the rotating member 50, and the rear end of the writing member 70 may be press-fitted and mounted. A projecting structure may be provided on the shaft center of 50, and this may be press fitted into an opening or hole provided at the rear end of the writing member 70. In the case where the “refill mounting hole 52” is provided, since the effective length of the refill can be increased, the amount of fluid such as ink that can be accommodated can be increased. Further, even if the writing member 70 is not directly attached to the rotating member 50, the writing member 70 may be attached indirectly, for example, through some member therebetween.

That is, according to the present invention, the structure of the writing member 70 can be simplified by not providing the replaceable writing member 70 with any structure related to the knock mechanism 30.
Here, when the writing member 70 is the application refill 90, a tip step 95 having a diameter larger than the outer diameter as the application tip 93 and larger than the opening 22 at the tip of the shaft cylinder 20 is provided near the tip. Is formed. Therefore, when the coating refill 90 moves in the tip direction, if the tip step portion 95 comes into contact with the opening 22 at the tip of the shaft tube 20, it cannot move further in the tip direction. At this time, in a state where the application tip 93 is exposed from the opening 22 at the tip of the shaft tube 20, the distance between the tip step portion 95 and the opening 22 at the tip of the shaft tube 20 is defined as " A". . For example, when the application refill 90 is the ballpoint pen tip 93a, the ballpoint pen tip 93a as the application tip 93 is press-fitted and fixed to the tip of the fluid accommodation tube 91, or via the fluid accommodation tube 91 and the ballpoint pen tip 93a. It will be press-fitted and fixed to the tip of the joint 94, but the tip of the fluid housing pipe 91, the tip of the joint 94 is larger in diameter than the outer diameter of the ballpoint pen tip 93a, and this part is from the tip. A stage will be constructed. This step becomes the tip step portion 95.

Now, in the cam mechanism 60, the rear end of the locking edge 62 of the locking ridge 61 (that is, the point located at the rearmost end of the locking edge 62) and the tip of the guiding edge 63 (that is, the guidance) The distance from the edge 63) is defined as “L”. In other words, this “L” is the distance that the “sliding protrusion 51”, which will be described later, must get over in the cam mechanism 60 when the writing tip 82 or the coating tip 93 protrudes to the retracted state. Means.
In the case of the mechanical pencil refill 80 as the writing member 70, the knock stroke, that is, the distance to move forward in one knock required to feed out the core 88 is defined as “X”. This distance X can also be defined by a movable distance of the “chuck mechanism 86” that is a feeding mechanism of the core 88, for example. Further, a stationary part 81 that contacts the opening at the tip of the refill, a movable part 84 that can be moved in the front-rear direction by knocking, and interposed between the stationary part 81 and the movable part 84, the movable part 84 is always rearward. When the knock spring 85 is biased to the configuration, the knock stroke of the knock spring 85 defined as the difference between the maximum length when the knock is not made and the shortest length when the knock is pushed and pressed is this It is good also as it being the distance X.

In the present invention, between the distances A, L and X,
X <L <A
The relational expression is established. The significance of this relational expression will be described below when the mechanical pencil refill 80 is used as the writing member 70 and when the ball pen refill 90a is used as a representative of the coating refill 90.
(1) Mechanical pencil refill 80 When mechanical pencil refill 80 is mounted on the shaft cylinder 20, depending on the positional relationship at the time of mounting, the sliding protrusion 51 of the rotating member 50 is positioned in the cam groove 64. And the state where the locking edge 62 of the locking ridge 61 is locked.

First, when the sliding protrusion 51 of the rotating member 50 is positioned in the cam groove 64, the writing tip 82 is not exposed from the tip of the shaft cylinder 20 immediately after mounting. When the knock member 40 is pressed in this state, the sliding protrusion 41 positioned in the cam groove 64 presses the sliding protrusion 51 positioned immediately before in the cam groove 64 forward. As a result, the rotating member 50 is also pressed forward.
When the sliding protrusion 51 is pressed beyond the front end of the locking protrusion 61, the sliding protrusion 41 and the locking edge 62 are aligned with the inclination of the locking edge 62 of the locking protrusion 61. Will be locked. Accordingly, the rotating member 50 is rotated by the length of the arc that the locking edge 62 occupies in the circumference of the inner periphery of the shaft cylinder 20. In this state, the writing tip 82 of the mechanical pencil refill 80 takes a position protruding from the opening edge of the tip of the barrel 20.

  Next, when the mechanical pencil refill 80 is mounted on the shaft cylinder 20, the sliding ridge 51 of the rotating member 50 is engaged with the engaging edge 62, or the sliding ridge 51 is engaged by a knocking operation. When the knock member 40 is pressed in the state of being engaged with the stop edge 62, the rotating member 50 is also pressed forward again. At this time, in order for the sliding protrusion 51 to get over the guide edge 63, it needs to be pressed over a distance L corresponding to the step between the locking edge 62 and the guide edge 63, but before that, the knock stroke Is the distance X, and the distance L is larger than the distance X from the above relational expression, so that the knock member 40 cannot be pressed beyond the distance X. However, on the other hand, since the knocking operation of this distance X can be secured, the lead 88 can be fully extended. That is, when the sliding pencil 51 of the rotating member 50 is locked to the locking edge 62 at the time when the mechanical pencil refill 80 is first attached to the shaft cylinder 20, or the sliding protrusion 51 is formed by a knocking operation. When the locking edge 62 is locked, the sliding protrusion 51 located on the locking edge 62 does not reach the cam groove 64 again beyond the guide edge 63. The tip 82 is kept in a state protruding from the opening 22 at the tip of the shaft cylinder 20.

(2) In the case of the ballpoint pen refill 90a When the ballpoint pen refill 90a is attached to the shaft cylinder 20, depending on the positional relationship at the time of attachment, the sliding protrusion 51 of the rotating member 50 is located in the cam groove 64, One of the states in which the locking ridge 61 is locked by the locking edge 62 is taken.
First, when the sliding protrusion 51 of the rotating member 50 is positioned in the cam groove 64, the ball-point pen tip 93a as the application tip 93 is not exposed from the tip of the shaft cylinder 20 immediately after mounting. When the knock member 40 is pressed in this state, the sliding protrusion 41 positioned in the cam groove 64 presses the sliding protrusion 51 positioned immediately before in the cam groove 64 forward. As a result, the rotating member 50 is also pressed forward.

When the sliding protrusion 51 is pressed beyond the front end of the locking protrusion 61, the sliding protrusion 41 and the locking edge 62 are aligned with the inclination of the locking edge 62 of the locking protrusion 61. Will be locked. Accordingly, the rotating member 50 is rotated by the length of the arc that the locking edge 62 occupies in the circumference of the inner periphery of the shaft cylinder 20. In this state, the application tip 93 of the ballpoint pen refill 90a takes a position protruding from the opening edge of the tip of the shaft cylinder 20.
Next, when the sliding ridge 51 of the rotating member 50 is locked to the locking edge 62 when the ballpoint pen refill 90a is mounted on the shaft cylinder 20, or the sliding ridge 51 is locked by a knocking operation. When the knock member 40 is pressed in the state of being engaged with the edge 62, the rotating member 50 is also pressed forward again. At this time, in order for the sliding protrusion 51 to get over the guide edge 63, it needs to be pressed beyond the distance L. However, in a state where the application tip 93 protrudes from the opening 22 at the tip of the shaft cylinder 20, the ball-point pen refill 90a can move until the tip step portion 95 contacts the opening 22 at the tip of the shaft cylinder 20. This movable distance is the distance A.

Since the distance A is larger than the distance L corresponding to the step between the locking edge 62 and the guide edge 63, the sliding protrusion 51 is moved to the distance L before the knock member 40 is pressed by the distance A. It will move beyond. Then, the sliding protrusion 51 reaches the guide edge 63 and moves to the next cam groove 64 along its inclination. At this time, the rotating member 50 is rotated by the length of the arc that the guide edge 63 and the cam groove 64 adjacent to the guiding edge 63 occupy the circumference of the inner periphery of the shaft cylinder 20, and the knock member 40 is urged by the urging force of the return spring 26. Is pushed rearward, and the sliding protrusion 51 is thus positioned in the cam groove 64.
The operation when the application member other than the ballpoint pen refill 90a is mounted, for example, a marker pen refill or a correction pen refill is the same as that of the ballpoint pen refill 90a.

  Since the present invention is configured as described above, for example, when a mechanical pencil refill is mounted as a writing member, the rotating member slides even if the knock member is pressed by the distance X that is the knock stroke. Since the protrusion cannot exceed the distance L corresponding to the step between the locking edge and the guide edge, the writing tip can be kept protruding. On the other hand, when a coating refill such as a ballpoint pen refill is attached as a writing member, the knocking member is equivalent to the distance A between the tip step portion and the opening at the tip of the shaft tube when the coating refill is in a protruding state. Since the sliding ridge of the rotating member exceeds the distance L corresponding to the step between the locking edge and the guide edge before pressing, the application tip can be retracted into the shaft tube.

  In this way, the structure of the refill can be made as much as possible in a knock-type writing instrument that can be customized to a mechanical pencil or ballpoint pen, or other writing instrument or applicator, such as a marker pen or a correction pen, depending on the user's preference or selection. It is possible to simplify and replace the refill more inexpensively and easily.

The axial cylinder in the writing instrument which concerns on 1 embodiment of this invention is shown with the front view (A) and front sectional drawing (B). In the writing instrument which concerns on 1 embodiment of this invention, the case where a mechanical pencil refill is mounted | worn with a shaft cylinder as a writing member is shown with the front view (A) and front sectional drawing (B). In the writing instrument which concerns on 1 embodiment of this invention, the case where a ball-point pen refill is mounted | worn with a shaft cylinder as a writing member is shown with the front view (A) and front sectional drawing (B). It is front sectional drawing (A) of the axial cylinder rear-end part in the writing instrument which concerns on 1 embodiment of this invention, and the principal part enlarged view (B) of a cam mechanism. The writing instrument which concerns on 1 embodiment of this invention WHEREIN: The mechanical pencil refill with which a shaft cylinder is mounted | worn as a writing member is shown with the front view (A) and front sectional drawing (B). It is front sectional drawing which expanded and showed the writing front-end | tip part in the state with which the mechanical pencil refill was mounted | worn with the axial cylinder. The writing instrument which concerns on 1 embodiment of this invention WHEREIN: The ball-point pen tip with which a shaft cylinder is mounted | worn as a writing member is shown with the front view (A) and front sectional drawing (B). It is front sectional drawing which expanded and showed the writing tip part in the state with which the ball-point pen refill was mounted | worn with the axial cylinder. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view. The operation | movement of a knock mechanism is shown with the partial perspective view.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view (A) and a front cross-sectional view (B) of a shaft cylinder 20 provided with a knock member 40 and a rotating member 50. The shaft cylinder 20 is formed by screwing a front shaft 21 to a rear shaft 23. From the opening 24 at the rear end of the shaft cylinder 20, a knock member 40 with a knock button 42 inserted is projected, and the rotating member 50 is located inside the front cylinder 20. A refill mounting hole 52 is provided in the axial center of the rotating member 50. From the vicinity of the tip of the knock member 40, three sliding protrusions 41 are equally arranged and protrude outward. On the outer side of the rear end side of the rotating member 50, three sliding protrusions 51 projecting outward with the direction along the axial center as the longitudinal direction are also arranged and projecting. Details of the positional relationship and operation between the sliding protrusion 41 and the sliding protrusion 51 will be described later.

On the other hand, in the rear shaft 23, a spring support member 25 is inserted from the front end side at a position just behind the front shaft 21. A return spring 26 is interposed between the spring support member 25 and the rotation member 50 to urge them in the direction of separating them. Note that a cam mechanism 60 is provided on the inner side surface near the rear end of the shaft cylinder 20, the details of which will be described later.
FIG. 2 is a front view (A) and a front sectional view (B) showing a case where a mechanical pencil refill 80 is mounted on the shaft cylinder 20 as the writing member 70 in the writing instrument 10 according to the present invention.
As the knock mechanism 30, a knock member 40, a rotating member 50, a cam mechanism 60, and a return spring 26 are provided.

A mechanical pencil refill 80 with a built-in core 88 and a writing tip 82 is mounted inside the shaft cylinder 20. The writing tip 82 protrudes from the opening 22 at the tip of the shaft cylinder 20. The rear end of the mechanical pencil refill 80 is press-fitted and fixed in the refill mounting hole 52 of the rotating member 50.
FIG. 3 is a front view (A) and a front sectional view (B) showing a case where a ballpoint pen refill 90a is mounted on the shaft cylinder 20 as the application refill 90 as the writing member 70 in the writing instrument 10 according to the present invention. It is a thing.
Inside the shaft cylinder 20, an ink 92a as a fluid 92 and an ink follower 92b located behind the fluid 92 are incorporated in an ink containing tube 91a as a fluid containing tube 91, and a ball-point pen tip 93a as an application tip 93 is provided. A ballpoint pen refill 90a equipped with is mounted. A ballpoint pen tip 93a holding a writing ball 93b at its tip protrudes from the opening 22 at the tip of the shaft tube 20. The rear end of the ballpoint pen refill 90a is press-fitted into the refill mounting hole 52 of the rotating member 50 and fixed.

4 is a front sectional view (A) of the rear end portion of the shaft cylinder 20 and an enlarged view (B) of a main part of the cam mechanism 60. FIG. The locking ridges 61 formed so as to protrude inward from the inner surface of the shaft cylinder 20 are a tip end surface that is inclined along the rotation direction and is on the opposite side of the rotation direction. It has a locking edge 62 near the rear end and a guide edge 63 from the front end on the positive direction side. A groove-like space between the locking protrusions 61 is a cam groove 64. That is, three cam grooves 64 are equally arranged. 4B, the distance L between the rearmost end of the locking edge 62 and the leading edge of the guide edge 63 is a distance L.
FIG. 5 is a front view (A) and a front sectional view (B) of a mechanical pencil refill 80 mounted on the shaft cylinder 20 as a writing member 70. A knock spring 85 is interposed between a non-moving portion 81 that constitutes a portion that does not move due to the knocking motion and a movable portion 84 that moves back and forth by the knocking motion. A core housing tube 87 is inserted from the rear end of the movable portion 84. Further, a tail plug 89 is press-fitted into the rear end of the core housing tube 87, and this portion is press-fitted and fixed in the refill mounting hole 52 of the rotating member 50 (see FIG. 2). The movable portion 84 also includes a chuck mechanism 86 that directly grips the lead 88 and feeds the lead 88 forward in accordance with the knocking operation.

  FIG. 6 is an enlarged front cross-sectional view of the writing tip 82 portion in a state where the mechanical pencil refill 80 is mounted on the shaft cylinder 20. On the inner surface of the stationary part 81, a reduced diameter step part 81a that reduces the inner diameter is formed in front of the chuck mechanism 86. During the knocking operation, the tip of the chuck mechanism 86 comes into contact with the reduced diameter step portion 81a, and as a result, it cannot move further forward. FIG. 6 shows a state where the knocking operation is not performed. In this state, the distance between the tip of the chuck mechanism 86 and the reduced diameter step portion 81a is a knock stroke (distance X). This distance X is smaller than the distance L. Further, in the writing tip 82, the portion protruding from the opening 22 at the tip of the shaft cylinder 20, the portion immediately after the opening 22 forms a tip step 83 having a larger diameter than the opening 22. The rear of this part is immovable forward of the opening 22.

  FIG. 7 is a front view (A) and a front sectional view (B) of a ballpoint pen refill 90a mounted on the shaft cylinder 20 as a writing member 70. FIG. 8 shows the ballpoint pen refill 90a. 20 is an enlarged front cross-sectional view of a coating tip 93 portion in a state of being attached to 20. FIG. A ball-point pen tip 93a is attached to the tip of the ink storage tube 91a (the state where the ink 92a and the ink follower 92b are not filled) via a joint 94. A writing ball 93b is held at the tip of the ballpoint pen tip 93a. The writing ball 93b is always urged toward the tip by a direct current prevention spring 93c housed in the ballpoint pen tip 93a. Further, the tip portion of the joint 94 is larger in diameter than the outer diameter of the ballpoint pen tip 93a, and a tip step portion 95 is formed at the boundary portion. Here, FIG. 8 shows a state where the knocking operation is not performed. In this state, the distance between the opening 22 at the distal end of the shaft tube 20 and the stepped portion 95 is as far as possible in the knocking operation. The distance A is movable. This distance A is larger than the distance L.

Next, the operation of the knock mechanism 30 will be described with reference to the partial perspective views of FIGS. 9a to 9i. In these drawings, the shaft cylinder 20 is expressed by omitting portions other than the thickness-corresponding portion of the locking protrusion 61. In addition, the “rotation direction” referred to in the following description is expressed from the viewpoint of seeing the rear end side from the front end side in the figure.
FIG. 9 a shows a state where the application tip 93 does not protrude from the opening 22 at the tip of the shaft cylinder 20 when the ballpoint pen tip 93 a is mounted as the writing member 70. On the other hand, when the mechanical pencil refill 80 is attached as the writing member 70, the writing tip 82 is accidentally taken out of the opening 22 at the tip of the shaft tube 20 when attached. In any case, in the cam groove 64 between the locking ridges 61, the sliding projection 41 of the knock member 40 is positioned on the rear side, and the sliding ridge 51 of the rotating member 50 is positioned on the front side. doing.

When the knock member 40 is pressed from the state of FIG. 9a, the sliding protrusion 51 is pushed forward by the sliding protrusion 41 in the cam groove 64 as shown in FIG. Move forward. At this time, the tip step portion 95 in the case of ball-point pen refill 90a is also a tip-stage differential 83 in the case of the mechanical pencil refill 80 is also not yet reached the barrel 20 front end of the opening 22.
When the knock member 40 is further pressed from the state of FIG. 9b, the rear end edge of the sliding protrusion 51 gets over the engaging edge 62 of the engaging protrusion 61 (FIG. 9c), and the inclination of the engaging edge 62 is increased. Then, the sliding protrusion 51 moves counterclockwise (FIG. 9d), and the sliding protrusion 51 and the locking edge 62 are completely engaged (FIG. 9e). As the sliding protrusion 51 rotates, the rotating member 50 similarly rotates by a pitch corresponding to this circumferential length of the locking edge 62. Here, both the tip step 95 in the case of the ballpoint pen refill 90a and the tip step 83 in the case of the mechanical pencil refill 80 are brought into contact with the opening 22 at the tip of the shaft tube 20 in FIG. 9e. As shown, a locking state between the sliding protrusion 51 and the locking edge 62 appears, and at this time, the application tip 93 and the writing tip 82 both take positions that protrude from the opening 22 at the tip of the shaft cylinder 20. (See FIGS. 8 and 6).

When the knock member 40 is pressed from the state shown in FIG. 9e, the rotating member 50 is also pressed forward. Then, the state in which the sliding protrusion 51 moves toward the front guide edge 63 and the engagement with the locking edge 62 is being released is the state shown in FIG. 9f.
Here, when the mechanical pencil refill 80 is attached as the writing member 70, the knock member 40 can be pressed only by the knock stroke of the distance X shown in FIG. It is impossible to get over the step (see FIG. 4) between the locking edge 62 and the guide edge 63 having a longer distance L. Therefore, in this case, the state shown in FIG. 9f is returned to the state shown in FIG. 9e again, and the state shown in FIGS. 9a and 9b is repeated by pressing the knocking member 40, and the state shown in FIG. 9a is not returned.

  On the other hand, when the ballpoint pen refill 90a is mounted as the writing member 70, the sliding ridge 51 has a length of a distance L shorter than the distance A while pressing the distance A shown in FIG. And over the step (see FIG. 4) between the guide edge 63 (FIG. 9g) and reach the guide edge 63 (FIG. 9h). Then, it reaches the cam groove 64 again along the inclination of the guide edge 63 (FIG. 9i), and at this stage, it is pushed back by the urging force of the return spring 26 (see FIGS. 2 and 3), and the state shown in FIG. 9a Thus, the ballpoint pen tip 93a is completely retracted into the shaft cylinder 20.

  The present invention relates to a writing instrument having a barrel having a knock mechanism, to which any one of a fluid ink such as a ballpoint pen, a marker pen and a correction pen is applied as a refill, and a mechanical pencil is removable. Is available.

10 Writing instruments
20 Shaft cylinder 21 Lead shaft 22 Opening at tip
23 Rear shaft 24 Rear end opening 25 Spring support member
26 Return spring
30 Knock mechanism
40 Knocking member 41 Sliding protrusion 42 Knock button
50 Rotating member 51 Sliding protrusion 52 Refill mounting hole
60 Cam mechanism 61 Locking ridge 62 Locking edge
63 Guide edge 64 Cam groove
70 Writing materials
80 Mechanical pencil refill
81 Non-moving part 81a Reduced diameter step part 82 Writing tip
83 Tip level difference 84 Movable part 85 Knock spring
86 Chuck mechanism 87 core receiving tube 88 core
89 Tail plug
90 Application refill 90a Ballpoint pen refill 91 Fluid tube
91a Ink receiving tube 92 Fluid 92a Ink
92b Ink follower 93 Application tip 93a Ballpoint pen tip
93b Writing ball 93c DC prevention spring 94 Fitting
95 Tip step

Claims (3)

A shaft cylinder having an opening at each of a front end and a rear end;
A writing member having a writing tip that is housed inside the shaft tube and can be withdrawn from the opening of the tip;
A writing instrument having a knock mechanism provided with a knock member at the rear of the shaft cylinder,
The knock mechanism is
The knock member;
A rotating member that is positioned on the distal end side of the knock member and is rotatable in a predetermined circumferential direction in accordance with the forward pressing of the knock member;
A cam mechanism provided on an inner peripheral surface near the rear end of the shaft cylinder;
A return spring that always urges the rotating member backward;
With
The knock member has a sliding protrusion provided to protrude on the outer surface thereof,
The rotating member has a sliding ridge that protrudes on the outer surface thereof and extends in the axial direction and has a rear end edge that is inclined in the distal direction toward the opposite direction of the rotating direction,
The cam mechanism is
A locking protrusion that protrudes inwardly on the inner peripheral surface near the rear end of the shaft tube and extends in the axial direction so as to be arranged in plural sets, and
Cam grooves formed as grooves between the respective locking protrusions;
Have
In the cam groove, the sliding protrusion and the sliding protrusion are slidable back and forth in the axial direction,
Of the leading edge of the locking ridge, the portion of the cam groove located on the rotational direction side is inclined toward the rear end toward the rotational direction, so that the rear edge of the sliding ridge is Formed as a locking edge that can be locked,
Of the leading edge of the locking ridge, the portion of the cam groove located on the opposite side to the rotational direction side is located closer to the distal end than the locking edge and is the rear end in the rotational direction. It is formed as a guide edge that guides the sliding protrusion to the cam groove by inclining in the direction,
As the writing member, a mechanical pencil refill provided with a chuck mechanism for feeding out the core as the writing tip is housed in the shaft cylinder,
As the knocking member is pushed forward, the sliding protrusion is pushed forward by the sliding protrusion in the cam groove, so that the rotating member also moves forward,
A rear end edge of the sliding protrusion climbs over a locking edge of the locking protrusion;
The sliding ridge moves along the inclination of the locking edge,
The writing tip of the mechanical pencil refill protrudes from the opening of the tip by completely engaging the sliding protrusion and the locking edge,
Furthermore, even if the knock member is pressed forward, the sliding protrusion cannot get over the step between the locking edge and the guide edge. As the writing member, in place of the mechanical pencil refill, a fluid containing tube for containing a fluid and a coating refill provided with the coating tip to be coated with the fluid can be accommodated in the shaft cylinder. ,
When the coating refill is accommodated in the shaft tube,
As the knocking member is pushed forward, the sliding protrusion is pushed forward by the sliding protrusion in the cam groove, so that the rotating member also moves forward,
A rear end edge of the sliding protrusion climbs over a locking edge of the locking protrusion;
The sliding ridge moves along the inclination of the locking edge,
The application tip of the application refill protrudes from the opening of the tip by completely engaging the sliding protrusion and the locking edge,
Further, when the knock member is pushed forward, the step between the locking edge and the guide edge is overcome, reaches the guide edge, reaches the cam groove along the slope of the guide edge, and the coating tip enters the shaft cylinder. The writing instrument according to claim 1, wherein the writing instrument is completely retracted.   The writing instrument according to claim 1 or 2, wherein a spring support member is provided inside the shaft tube, and the return spring is interposed between the spring support member and the rotating member.