JP2023032508A - writing instrument - Google Patents

Abstract

To provide a writing instrument with excellent design property and without operability impaired.SOLUTION: A writing instrument 1 of the present invention is a knock type writing instrument comprising a barrel 10 encasing a writing body 20. The writing instrument 1 comprises: a tip operation mechanism 100 which causes a tip of the writing body 20 to project and retract, or at least to project with respect to a tip of the barrel 10; and an operation body 30 which activates the tip operation mechanism 100. The operation body 30 has: an operation part 33 arranged on a rear side in an axis A direction of the barrel 10, and separated from the rear end of the barrel 10 at least in a non-writing mode when knocking is not performed; and a pressing part 31 which is arranged inside the barrel 10, and presses the tip operation mechanism 100 in cooperation with the operation part 33 when the operation part 33 is knocked.SELECTED DRAWING: Figure 1

Description

The present invention relates to writing instruments.

Conventionally, there is a writing instrument comprising a barrel, a writing body housed inside the barrel, a tip manipulation mechanism for causing the tip of the writing body to protrude and retract with respect to the tip of the barrel, and an operating portion for actuating the tip manipulation mechanism. Proposed. In such a writing instrument, the operating portion is inserted and held at the rear end of the barrel, and knocking the operating portion presses and operates the distal end operating mechanism (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2020-142500

In the writing instrument proposed in Patent Literature 1, from the viewpoint of operability and component strength, the design is limited to that the operation portion and the tip operation mechanism are connected within the barrel.

SUMMARY OF THE INVENTION An object of the present invention is to provide a writing instrument which is superior in design and does not impair operability.

In order to solve the above-mentioned problems, the present invention is a knock-type writing instrument having a barrel in which a writing body is accommodated, wherein the tip of the writing body protrudes from and retracts into the tip of the barrel. and an operation body for actuating the tip operation mechanism, the operation body being arranged on the rear side of the barrel in the axial direction and at least in a non-writing state when not knocking. has an operation part spaced apart from the rear end of the barrel, and is arranged inside the barrel, and is interlocked with the operation part to press the tip operation mechanism when the operation part is knocked. To provide a writing instrument having a pressing portion for pressing.

The operating portion may be arranged at a position passing through the axis.

A portion of the operating portion may enter the interior of the barrel from the rear end of the barrel when knocked.

The operating body may have a connecting portion that connects the pressing portion and the operating portion.

The operating body may have a clip portion extending forward from the connecting portion and extending forward from the outer side of the barrel.

The operating body may be rotatable about a clip rotating shaft extending in a direction perpendicular to the axis so that the front side of the clip portion is separated from the shaft cylinder.

The connecting portion may be U-shaped.

ADVANTAGE OF THE INVENTION According to this invention, the writing instrument which is excellent in design and does not impair operability can be provided.

It is a sectional view of ball-point pen 1 of a 1st embodiment. 1 is an exploded perspective view of a ballpoint pen 1; FIG. 4 is an enlarged exploded view of the operation body 30 and the distal end operation mechanism 100; FIG. 4 is an enlarged assembly diagram of the operation body 30 and the distal end operation mechanism 100. FIG. FIG. 4 is a cross-sectional view of the rear end portion of the ballpoint pen 1 in a non-writing state when knocking is not performed; 3 is a cross-sectional view of the rear end portion of the ballpoint pen 1 showing a state in which the front side of the clip portion 36 of the operating body 30 is lifted from the barrel 10. FIG. 4A and 4B are diagrams showing the operation of the distal end operating mechanism 100. FIG. 4A and 4B are diagrams showing the operation of the distal end operating mechanism 100. FIG. In the figure showing the inside of the rear end portion of the ballpoint pen 1 when fully knocked, the barrel 10 is indicated by a dotted line. In the figure showing the inside of the rear end portion of the ballpoint pen 1 in the non-knocking writing state, the barrel 10 is indicated by a dotted line. FIG. 11 is a cross-sectional view of a mechanical pencil 200 of a second embodiment; FIG. 12 is an enlarged view of the front side of FIG. 11;

(First embodiment)
A writing instrument according to a first embodiment of the present invention will be described below. In the first embodiment, a ballpoint pen 1 will be described as an example of a writing tool.

FIG. 1 is a sectional view of a ballpoint pen 1 of the first embodiment, and FIG. 2 is an exploded perspective view of the ballpoint pen 1. As shown in FIG. The ballpoint pen 1 includes a barrel 10, a writing body 20 housed inside the barrel 10, a tip manipulation mechanism 100 for moving the tip of the writing body 20 with respect to the tip of the barrel 10, and and an operating body 30 that operates the distal end operating mechanism 100 by moving back and forth with a predetermined stroke length. Hereinafter, the tip side of the writing body 20 in the ball-point pen 1 will be described as the front side, and the opposite side thereof as the rear side. The ballpoint pen 1 further includes a clip spring 110 that biases the operation body 30 and a tail plug 120 that is arranged at the rear end of the tip operation mechanism 100 .

Note that, in this specification, the term "at the time of knocking" indicates a state in which a knocking operation is performed on the operation body 30 (an operation unit 33, which will be described later). Further, the full knock indicates a state in which the operating portion 33 is pushed all the way to the back (front side) in the knocking operation. Further, the term "non-knocking" indicates a state in which the operation unit 33 is not being knocked. Specifically, at the time of non-knocking, a non-writing state (see FIG. 7A) in which the tip of the writing body 20 is retracted into the tip of the barrel 10, and a knocking operation to the operating portion 33 from the non-writing state. and a writing state in which the tip of the writing body 20 protrudes from the tip of the barrel 10 (see FIG. 10).

(Axle tube 10)
The barrel 10 includes a front barrel 11 extending along the barrel axis A<b>1 and a rear barrel 12 connected to the rear end of the front barrel 11 . The rear barrel 12 is fitted and integrated with an inner barrel 50, which will be described later, and the inner barrel 50 and the front barrel 11 are connected by screwing. In the first embodiment, the barrel axis A1 coincides with the axis A of the ballpoint pen 1. As shown in FIG. The barrel 10 is made of a metal material such as aluminum. The barrel 10 may be made of a resin such as polycarbonate as well as a metal material.

(Front barrel 11)
The front cylinder 11 has a tapered cylindrical shape, and an opening 11a through which the tip of the writing body 20 appears and disappears passes through the front end in the direction of the axis A. As shown in FIG. A female screw portion 11b is formed on the inner surface of the front barrel 11 on the rear end side.

(Rear barrel 12)
The rear barrel 12 has a cylindrical shape, and on the rear side there are a slide groove 13 in which a protrusion 37 of the operation body 30 (to be described later) slides when knocking, and a slit in which a first arm 32 of the operation body 30 moves. 14 are formed extending in the front-rear direction. The length of the slide groove portion 13 and the slit 14 in the front-rear direction corresponds to the stroke length of the operating body 30 when knocking.
In the first embodiment, the projection 37 of the clip portion 36 of the operating body 30 is slightly above the bottom surface of the slide groove portion 13 of the rear barrel 12 , and the apex of the projection 37 is located on the rear barrel 12 . Located inside the cylindrical outer surface. By providing the slide groove portion 13 , even a thin object to be clipped can be clamped between the slide groove portion 13 and the projecting portion 37 .

(Cursive 20)
The writing body 20 is housed inside the barrel 10 and extends along the writing body axis A2. The cursive axis A2 coincides with the axis A in the first embodiment. The writing body 20 is a ball-point pen refill in the first embodiment, and includes a ball-point pen tip 21, a joint 22 provided on the rear side of the writing body axis A2 of the ball-point pen tip 21, and an ink storage tube 23 connected to the joint 22. , provided. The joint 22 has a flange portion on the ink containing tube 23 side, and the front surface of the flange portion serves as a spring receiving surface 24 .

FIG. 3 is an enlarged exploded view of the operating body 30 and the distal end operating mechanism 100. FIG. FIG. 4 is an enlarged assembly diagram of the operating body 30 and the distal end operating mechanism 100. As shown in FIG. FIG. 5 is a cross-sectional view of the rear end portion of the ballpoint pen 1 in a non-writing state when knocking is not performed. FIG. 6 is a cross-sectional view of the rear end portion of the ballpoint pen 1 showing a state in which the front side of the clip portion 36 of the operating body 30 is lifted away from the barrel 10. As shown in FIG. 7 and 8 are diagrams showing the operation of the distal end operating mechanism 100. FIG.

(Operating body 30)
The operating body 30 is made of a metal material such as aluminum die casting such as ADC 12 or zinc die casting such as ZDC 2, or resin such as polycarbonate or ABS, and operates the distal end operating mechanism 100 . If the operating body 30 is made of a metal material, it is preferable because it provides rigidity.

The operation body 30 includes a pressing portion 31 arranged inside the barrel 10, a first arm portion 32 extending from the pressing portion 31 to the outside of the outer surface of the barrel 10, and a rear side of the barrel 10 in the direction of the axis A. A second arm portion 34 extending radially outward of the axis A from the operating portion 33, a second arm portion 34, and a first A connecting portion 35 connecting the arm portion 32 and the second arm portion 34, a clip portion 36 extending forward from the connecting portion 35, a protrusion 37 provided inside the clip portion 36, and a clip rotating shaft 38. , and a clip movement restricting portion 39 . The first arm portion 32 , the second arm portion 34 , and the connection portion 35 together form a connection portion that connects the pressing portion 31 and the operation portion 33 . In the first embodiment, the operating body 30 is configured as a single component, but the connecting section and the operating section 33 may be configured as separate components, for example.

Here, "the operation portion 33" is "arranged on the rear side of the shaft tube 10 in the direction of the axis A" means that the operation portion 33 is located on the inner diameter side of the shaft tube 10 when viewed from one side of the axis A. Means to be located within an area. Further, in the first embodiment, the axis of the operating portion 33 and the axis of the barrel 10 overlap.

The pressing portion 31 has a substantially rectangular plate shape extending in a direction substantially perpendicular to the axis A. As shown in FIG. The front surface of the pressing portion 31 is a substantially flat surface that is substantially perpendicular to the axis A. As shown in FIG. On the other hand, a front wall 91b of a pressing portion storage chamber 91 of a later-described knock body 90 in which the pressing portion 31 is stored is also substantially perpendicular to the axis A. As shown in FIG. Therefore, the front surface of the pressing portion 31 is in surface contact with the front wall 91b of the pressing portion storage chamber 91 and can press the front wall 91b. Therefore, the pressing force of the pressing portion 31 is efficiently transmitted to the knock body 90 .

As shown in FIGS. 5 and 6, a clip rotation shaft 38, which is a columnar protrusion protruding from both side surfaces, is provided at the end of the pressing portion 31 opposite to the clip portion 36 with respect to the axis A. It is A rotation axis B (shown in FIG. 3) passing through two clip rotation shafts 38 provided on both sides is perpendicular to the axis A. As shown in FIG. The operation body 30 is rotatable around the rotation axis B. As shown in FIG.
The pressing portion 31 has a substantially rectangular plate shape extending in a direction substantially orthogonal to the axis A, and has a thickness substantially equal to the outer diameter of the clip rotating shaft 38 . The clip rotating shaft 38 is provided at the end opposite to the clip portion 36 with the axis A of the pressing portion 31 interposed therebetween and at a position on the front end side of the pressing portion 31 . With such a configuration, when the operating body 30 rotates about the clip rotation shaft 38 (rotation axis B) so that the front side of the clip portion 36 is separated from the barrel 10, the pressing portion 31 is The knock body 90 is not pushed forward. Also, a compact clip rotation structure can be achieved.

The first arm portion 32 extends from the pressing portion 31 toward the connecting portion 35 on the radially outer side of the axis A and protrudes from the outer surface of the barrel 10 . The end surface of the first arm portion 32 on the side of the pressing portion 31 serves as a spring pressing surface 32a.

Clip movement restricting portions 39, which are columnar projections, are provided on both side surfaces of the connecting portion between the first arm portion 32 and the pressing portion 31. As shown in FIG. The clip movement restricting portion 39 restricts movement in the rotating direction when the operating body 30 rotates about the clip rotating shaft 38 .

In the first embodiment, the operating portion 33 has a substantially truncated cone shape and is arranged on the rear side of the barrel 10 in the direction of the axis A, and the bottom surface of the truncated cone faces the front side, that is, the barrel 10 side. The operating portion 33 is spaced from the rear end of the barrel 10 when not knocked as shown in FIG. That is, the operating portion 33 has a gap between it and the rear end of the barrel 10 when knocking is not performed. The outer diameter of the operating portion 33 is slightly smaller than the inner diameter of the rear end of the barrel 10 . When knocking, part of the operating portion 33 enters the rear end of the barrel 10 .

Further, the operating portion 33 passes through the axis A when the operating body 30 shown in FIG. 5 is not rotated. In the first embodiment, the operation portion 33 is arranged with the axis A as the center.

The second arm portion 34 extends radially outward of the axis A from the operation portion 33 . The second arm portion 34 and the first arm portion 32 are substantially parallel in side view. The width of the second arm portion 34 in the radial direction of the axis A is substantially the same as the width of the first arm portion 32 and is a width that allows the slit 14 to be entered.

The connecting portion 35 connects the first arm portion 32 and the second arm portion 34 . A connecting portion including the first arm portion 32 , the connecting portion 35 , and the second arm portion 34 connects the pressing portion 31 and the operating portion 33 in a U-shape when the barrel 10 is viewed from the side. It is preferable to configure the connecting portion as an integrated one-piece component, because the rigidity increases.

The clip portion 36 is integrally continuous from the connection portion 35 and extends forward along the outer surface of the barrel 10 . A semi-circular projection 37 is provided on the front surface of the clip portion 36 facing the barrel 10 .

As described above, when knocking, the projection 37 slides in the slide groove 13 provided in the barrel 10 and the first arm 32 moves in the slit 14 . Also, the second arm portion 34 enters the slit 14 from the rear end of the slit 14 . (See Fig. 9)

(Tip Manipulation Mechanism 100)
The tip operation mechanism 100 is a mechanism that allows the tip of the writing body 20 to protrude from and retract into the tip of the barrel 10 . In the first embodiment, the tip operation mechanism 100 is arranged between the front spring 40, the inner cylinder 50 that accommodates the writing body 20, the pusher 70, the knock body 90, and the pusher 70 and the knock body 90. A rotor 80 and a rear spring 60 are provided.
However, the tip operation mechanism is not limited to this configuration as long as it is a mechanism that causes the tip of the writing body to protrude from and retract into, or at least protrude from, the tip of the barrel.

(front spring 40)
The front spring 40 shown in FIGS. 1 and 2 is, for example, a compression coil spring made of stainless steel. The front spring 40 is inserted into the outer periphery of the joint 22 on the front side of the writing body 20 , the front end abuts against a stepped portion provided on the inner surface of the front barrel 11 , and the rear end is a flange portion provided on the joint 22 . It abuts against the spring receiving surface 24 and urges the writing body 20 rearward, and pushes the pusher 70 rearward via the writing body 20 .

(Inner cylinder 50)
The inner cylinder 50 is a cylindrical member and includes an inner cylinder front portion 50F, an inner cylinder middle portion 50M, and an inner cylinder rear portion 50B. The inner cylinder 50 is fixed with respect to the shaft cylinder 10 . On the outer surface of the inner cylinder middle portion 50M, a protrusion 50a is provided on the entire circumference of the front side, and four ribs 50b are provided in the direction of the axis A on the rear side. The outer surface of the inner cylinder middle portion 50M is fitted to the inner surface of the rear barrel 12, and the inner cylinder 50 and the rear barrel 12 move in the longitudinal direction with the inner barrel front portion 50F protruding from the front end of the rear barrel 12. It is non-rotatable and non-rotatable.

A male threaded portion 51 that can be screwed into the female threaded portion 11b of the front barrel 11 is formed on the outer surface of the front portion 50F of the inner barrel. Fixed. By removing the front barrel 11, the stored writing body 20 can be taken out. The inner cylinder rear portion 50B has a smaller diameter than the inner cylinder middle portion 50M, and a stepped portion 52 is provided in a portion continuing from the inner cylinder middle portion 50M to the inner cylinder rear portion 50B. A rear spring 60 is externally inserted in the inner cylinder rear portion 50</b>B, and the front end of the rear spring 60 is pressed by the step portion 52 .

The inner cylinder rear portion 50B is provided with two notches 54 extending forward from the rear end. A portion of the inner cylinder rear portion 50B other than the notch 54 is an extension portion 55 extending rearward.
As shown in FIG. 3, the rear end of the extending portion 55 is provided with a rear end projecting portion 56 projecting toward the inner diameter side. An inner circumferential projection 58 is provided on the inner surface of the extending portion 55 on the front side of the rear end projecting portion 56 . A rotor large-diameter portion 81 of a rotor 80, which will be described later, is held between the rear end projecting portion 56 and the inner circumferential projection 58, and movement of the rotor 80 in the direction of the axis A is restricted.

An outer circumferential projection 57 is provided on the outer surface of the rear end of the extending portion 55 . The rear surface of the outer circumferential projection 57 abuts on the rear barrel stepped portion 15 of the inner surface of the rear barrel 12 (not shown). As a result, the position of the inner cylinder 50 rearward in the direction of the axis A with respect to the rear barrel 12 is regulated, and the inner cylinder 50 is prevented from coming off rearward. The front surface of the outer surface circumferential projection 57 receives the rear end of the rear spring 60 together with the front surface of the knock flange portion 96 of the knock body 90 (to be described later) when not knocking.

(Pusher 70)
The pusher 70 rotatably holds the rotor 80 and is movable in the direction of the axis A with respect to the inner cylinder 50 . The pusher 70 has a pusher pressing surface portion 71 provided on the front side. The pusher pressing surface portion 71 is arranged on the front side of the inner circumferential projection 58 of the inner cylinder 50 in the direction of the axis A. As shown in FIG.
Two sliding portions 72 are provided on the outer periphery of the presser pressing surface portion 71 . The slide portion 72 is inserted into two cutouts 54 of the inner cylinder 50 , so that the presser 70 slides back and forth along the cutouts 54 . The outer diameter of the slide portion 72 of the pusher 70 is smaller than the inner diameter of the rear spring 60 .
The pusher 70 further includes a cylindrical portion 73 extending rearward from the pusher pressing surface portion 71 . Three cam-forming thick portions 74 extending in the direction of the axis A are provided on the outer peripheral portion excluding the rear end side of the cylindrical portion 73 , and the rear end surfaces of the cam-forming thick portions 74 serve as pusher cams 75 . . A step surface 77 extending parallel to the axis A is provided between the cam surfaces of the pusher cam 75 .
The cam-forming thick portion 74 does not cover the entire circumferential direction of the outer circumference of the front side of the cylindrical portion 73, and between the three cam-forming thick portions 74, there are three presser grooves 76 extending parallel to the axis A. is provided.

(Knock body 90)
The knocking body 90 has a pressing part storage chamber 91 for storing the pressing part 31 of the operation body 30 and the clip spring 110 at its rear end, two knock slide parts 95 extending forward from the pressing part storage room 91 and facing each other, and a pressing part. and a knock cam 94 provided on the front surface of the front wall 91 b of the storage chamber 91 .

The pressing portion storage chamber 91 has two side walls 91a facing each other and a front wall 91b, and an engaging protrusion 91c is provided on the outer surface of the side wall 91a. The tail plug 120 is attached to the knock body 90 by inserting an engagement hole 124 of the tail plug 120, which will be described later, into the engagement protrusion 91c.
On the inner surface of the side wall 91a, a shaft holding recess 91d in which the clip rotating shaft 38 is rotatably held, and a clip movement restricting portion 39 are formed in the circumferential direction around the clip rotating shaft 38 held in the shaft holding recess 91d. A moving recess 91e is provided.

The knock slide portion 95 extends forward from the pressing portion storage chamber 91 . The knock slide portion 95 is slidable in the notch 54 of the inner cylinder 50 in the direction of the axis A. As shown in FIG. A knock flange portion 96 is formed on the outer periphery of the front end of the knock slide portion 95 . The outer diameter of the knock flange portion 96 is larger than the outer diameter of the slide portion 72 of the pusher 70 . The front surface of the knock flange portion 96 receives the rear end side of the rear spring 60 , and the knock body 90 is urged rearward by the rear spring 60 .
The rear surface of the knocking flange portion 96 of the knocking body 90 abuts against the rear barrel stepped portion 15 of the rear barrel 12 , thereby restricting the rearward movement of the knocking body 90 along the axis A of the barrel 10 .

The knock cam 94 is provided facing forward on the front surface of the front wall 91b of the pressing portion storage chamber 91, and a stepped surface 97 extending parallel to the axis A is provided between the cam surfaces of the knock cam 94. .

(Rotor 80)
The rotor 80 has a cylindrical shape, has a rotor large-diameter portion 81 and a rotor small-diameter portion 82 , and is inserted into the cylindrical portion 73 of the pusher 70 . The rotor large-diameter portion 81 is arranged between the inner surface circumferential projection 58 of the inner cylinder 50 and the rear end projecting portion 56 . In the non-writing state during non-knocking, the presser 70 is positioned between the rear end surface of the ink containing tube 23 of the writing body 20 and the front wall 91b (the front end of the cylindrical portion of the front wall 91b) of the pressing portion storage chamber 91 of the knocking body 90. sandwiched between Also, at this time, the rotor 80 is sandwiched between the pusher pressing surface portion 71 and the rear end projecting portion 56 .

Since the inner cylinder 50 does not move in the direction of the axis A of the ballpoint pen 1, the movement of the rotor 80 held between the inner surface circumferential projection 58 of the inner cylinder 50 and the rear end projecting portion 56 is also restricted from moving in the direction of the axis A. However, the rotor 80 is rotatable about the axis A between the inner circumferential projection 58 and the rear end projecting portion 56 . Thus, in order to allow the rotor 80 to rotate about the axis A between the inner circumferential projection 58 and the rear end projection 56, the inner circumferential projection 58 and the rear end projection 56 are The distance between them in the direction of the axis A is a distance having a slight clearance with respect to the width in the direction of the axis A of the rotor large-diameter portion 81 of the rotor 80 .

However, in the non-writing state at the time of non-knocking, the front surface of the rotor small diameter portion 82 is in contact with the rear surface of the pusher pressing surface portion 71 . Since the pusher 70 is urged rearward by the front spring 40 via the writing body 20, the front surface of the rotor small diameter portion 82 of the rotor 80 is also urged rearward by the rear surface of the pusher pressing surface portion 71. It is Therefore, the rotor 80 is held without a gap between the pusher pressing surface portion 71 and the rear end projecting portion 56 of the inner cylinder 50 . Further, in the non-knocking writing state, a pusher contact surface 84 that is the front surface of a cam member 83 (described later) of the rotor 80 is in contact with the pusher cam 75 of the pusher 70 . Since the pusher 70 is urged rearward by the front spring 40 through the writing body 20, the pusher cam 75 also pushes the pusher contact surface 84, which is the front surface of the cam member 83 of the rotor 80, to the rear side. is energized by Therefore, the rotor 80 is held between the pusher cam 75 and the rear end projecting portion 56 of the inner cylinder 50 without a gap. Therefore, rattling of the rotor 80 in the direction of the axis A is prevented during non-knocking (writing state and non-writing state), in other words, except during knocking.

Three cam members 83 are formed at equal intervals on the inner surface of the rotor 80 . 7 and 8 show only the cam member 83 of the rotor 80 for convenience of explanation. The front surface of the cam member 83 is a pusher contact cam 84 that contacts the pusher cam 75 of the pusher 70 , the rear surface of the cam member 83 is a knock contact cam 85 that contacts the knock cam 94 of the knock body 90 , and the side surface of the cam member 83 . serves as a slide surface 86 that slides within the pusher groove 76 .

(rear spring 60)
The rear spring 60 is, for example, a compression coil spring made of stainless steel, and is sandwiched between the stepped portion 52 of the inner cylinder 50 and the knock flange portion 96 of the knock body 90 while being compressed from its natural length. The knock body 90 is always urged rearward by the rear spring 60, and the pressing portion 31 of the operation body 30 is urged rearward via the knock body 90, so that the entire operation body 30 is urged rearward. ing. Therefore, even in the writing state, the operating portion 33 of the operating body 30 is held on the rear side of the barrel 10 in a state separated from the barrel 10 .

(clip spring 110)
The clip spring 110 is, for example, a compression spring made of stainless steel, and is arranged in the pressing portion storage chamber 91 . The clip spring 110 is arranged so that the central axis of the spring is perpendicular to the axis A and perpendicular to the rotation axis B. As shown in FIG. One end of the clip spring 110 is placed on a pedestal 123 of the tail plug 120, which will be described later, and the other end of the clip spring 110 is pressed by the spring pressing surface 32a of the first arm 32 of the operating body 30. ing. In other words, the clip spring 110 is sandwiched between the pedestal 123 of the tail plug 120 and the spring pressing surface 32a of the first arm portion 32 in a state of being compressed from its natural length and biased.

In a state in which no pressing force is applied to press the rear side of the operating body 30 (connecting portion 35) in a direction substantially perpendicular to the axis A, the front surface of the pressing portion 31 of the operating body 30 is a knocking body. The forward movement of the clip portion 36 is restricted by contacting the rear surface of the front wall 91b of the clip portion 90 .

The projection 37 on the front side of the clip portion 36 of the operating body 30 does not abut on the barrel 10 and is slightly lifted from the bottom surface of the slide groove portion 13, and is sufficiently spaced between the clip portion 36 and the barrel 10. It is possible to generate a clamping force. By adopting such a structure, it is possible to prevent the protrusion 37 of the clip portion 36 and the shaft tube 10 from being damaged due to rubbing when knocking.

As indicated by an arrow in FIG. 6, a pressing force is applied to press the rear side of the operation body 30 (connecting portion 35) in a direction substantially perpendicular to the axis A, and the front side of the clip portion 36 of the operation body 30 is pushed into the barrel. When lifted away from 10, clip spring 110 is further compressed. When the pressing force is released, the restoring force of the clip spring 110 returns the clip portion 36 from the lifted state to the original state.

(tail plug 120)
The tail plug 120 includes a rear wall 121 closing the rear end of the pressing portion storage chamber 91 of the knock body 90, a base 123 extending forward from the rear wall 121, and two engaging walls 122 facing each other. An engagement hole 124 is provided in the engagement wall 122 . The tail plug 120 is attached to the knock body 90 by engaging the engagement protrusion 91 c of the knock body 90 with the engagement hole 124 . The rear wall 121 of the breech plug 120 covers the opening at the rear end of the barrel 10 when not knocked. When the operating portion 33 is knocked, the rear wall 121 of the breech plug 120 moves forward from the rear end of the barrel 10 in conjunction with the forward movement of the operating portion 33 , and the operating portion 33 moves forward from the rear end of the barrel 10 . It becomes possible to enter the interior of
In the first embodiment, the outer diameter of the operating portion 33 is slightly smaller than the inner diameter of the rear end of the barrel 10, and a part of the front side of the operating portion 33 enters the inside of the rear end of the barrel 10 when knocking. As a result, movement of the operating portion 33 in directions other than the direction of the axis A is restricted.

(Features of operation body 30)
Next, features of the operating body 30 of the first embodiment will be described. FIG. 9 is a diagram showing the inside of the rear end of the ballpoint pen 1 when fully knocked, and the barrel 10 is indicated by a dotted line. FIG. 10 is a view showing the inside of the rear end of the ballpoint pen 1 in the writing state within the non-knocking state, and the barrel 10 is indicated by a dotted line.
As shown in FIG. 9, the operating portion 33 of the operating body 30 moves forward when fully knocked and is partially inserted into the rear end of the barrel 10. ) or in the non-knocking, writing state shown in FIG.

In this manner, the operating portion 33 is separated from the rear end of the barrel 10 when not knocked, and a gap is provided between the operating portion 33 and the barrel 10, so that the operating portion 33 appears to be floating in the air. , has excellent design features.
That is, in both the non-writing state shown in FIG. 7A and the writing state shown in FIG. It has excellent design.

When the operating portion 33 is knocked forward in the direction of the axis A, a portion of the operating portion 33 enters the inside of the rear end of the barrel 10 as shown in FIG. At this time, the pressing force of the operation part 33 is applied to the pressing part 31 via the second arm part 34, the connection part 35 and the first arm part 32 of the operation body 30, which are the connecting parts connected in a U-shape. is transmitted, and the pressing portion 31 presses the knock body 90 .
Here, since the operating portion 33 is arranged at a position passing through the axis A of the barrel 10 , the pressing force of the operating portion 33 is efficiently transmitted to the pressing portion 31 .
In addition, since the operating portion 33 and the pressing portion 31 are connected by a U-shaped connecting portion, the pressing force of the operating portion 33 is efficiently transmitted to the pressing portion 31 in this respect as well.
Furthermore, the operation body 30 is manufactured from aluminum die-casting such as ADC12, zinc die-casting such as ZDC2, or resin such as polycarbonate or ABS. In particular, when the U-shaped connecting portion is integrally manufactured from a high-strength hard metal material, the force that presses the operating portion 33 is sufficient for the pressing portion 31 without deforming the connecting portion. Since it is transmitted to , the operability is good. Furthermore, by making the connecting portion thinner than the outer diameters of the operating portion 33 and the shaft tube 10 as in the first embodiment, the operating portion 33 can be more effectively designed as if it is floating in the air. be able to.

(Action when clipping)
Next, the operation of the operation unit 33 during clipping will be described.
As indicated by the arrow in FIG. 6, the rear side of the operating body 30 (connecting portion 35) is pressed in a direction substantially orthogonal to the axis A. As shown in FIG. Then, the operating body 30 rotates about the clip rotating shaft 38 held in the shaft holding recess 91d. The clip movement restricting portion 39 moves about the clip rotating shaft 38 within a movable concave portion 91 e provided in the side wall 91 a of the pressing portion storage chamber 91 of the knock body 90 . In other words, the movement of the clip movement restricting portion 39 is restricted by contacting the clip movement restricting portion 39 with the rear end of the movable concave portion 91e. The clip spring 110 is pressed and compressed by the spring pressing surface 32 a of the first arm portion 32 .

Then, the front side of the clip portion 36 is lifted in the direction away from the barrel 10, and the protrusion 37 is separated from the slide groove portion 13 of the barrel 10, so that the object to be clipped can be clamped. When the pressing force is released from this state, it becomes possible to attach the ball-point pen 1 to a pocket or the like by clamping an object to be clipped, such as cloth of a pocket, between the clip portion 36 and the outer surface of the barrel 10 .

(Operation of tip operation mechanism 100)
Next, the operation of the distal end operating mechanism 100 will be described.
7 and 8 are diagrams showing the operation of the distal end operating mechanism 100, but the inner cylinder 50, the front spring 40 and the rear spring 60 are not shown, and the rotor 80 has only the cam member 83 provided on the inner surface. show. A dashed line in the drawing indicates the center of the cam member 83 of the rotor 80 in the direction of the axis A. As shown in FIG. Since the rotor 80 is fixed in the direction of the axis A with respect to the ball-point pen 1 , the dashed line indicates the position in which the ball-point pen 1 is fixed in the direction of the axis A. FIG.

FIG. 7(a) shows the non-writing state of the ball-point pen 1. FIG. The non-writing state is a state in which the operating portion 33 of the operating body 30 is not knocked and the tip of the writing body 20 does not protrude from the tip of the barrel 10 (retracted state). At this time, the knocking body 90, the presser 70 and the writing body 20 are positioned on the rearmost side of the movable range with respect to the rotor 80, and the cam member 83 of the rotor 80 is positioned in the presser groove of the presser 70. It is located on the front side within 76 .

FIG. 7(b) shows a state in which the operation to change from the non-writing state to the writing state has started. When switching from the non-writing state to the writing state, the operator knocks the operating part 33 of the operating body 30 . Then, the operating body 30 is moved forward by pressing the operating portion 33 .
Since the pressing portion 31 of the operating body 30 presses the knocking body 90 forward, the knocking body 90, the pusher 70 and the writing body 20 move forward as indicated by arrows in the drawing. Since the rotor 80 is fixed in the direction of the axis A with respect to the ball-point pen 1, when the pusher 70 moves forward, the cam member 83 (rotor 80), which is a flat surface extending in the direction of the axis A, moves toward the axis A. It moves relatively rearward along the side surface of the pusher groove 76 of the pusher 70 which is a plane extending in the direction.

FIG. 7(c) shows a state in which the operator further knocks the operating portion 33 of the operating body 30 forward from the state shown in FIG. 7(b). The cam member 83 (rotor 80 ) comes out of the pusher groove 76 of the pusher 70 , and the knock contact cam 85 , which is the slope on the rear side of the cam member 83 (rotor 80 ), contacts the slope on the front side of the knock body 90 . A state in which a certain knock cam 94 is in contact is shown.
At this time, the knock cam 94 of the knock body 90 presses the knock contact cam 85 of the cam member 83 (rotor 80) forward, so that the knock contact cam 85 of the cam member 83 (rotor 80) moves toward the knock body. It slides along the knock cam 94 of 90. This causes the rotor 80 to start rotating in the direction of the arrow.

FIG. 7D shows the full knock state of the operating portion 33 of the operating body 30 . FIG. 9 is a diagram showing the inside of the rear end of the ballpoint pen 1 when fully knocked.
When the rotor 80 rotates and the slide surface 86 of the cam member 83 (rotor 80), which is a plane extending in the direction of the axis A, contacts the stepped surface 97 of the knock body 90, which is a plane extending in the direction of the axis A, Rotation of the rotor 80 stops.
Here, the position of the rotor 80 is fixed in the direction of the axis A, and the knock cam 94 of the knock body 90 is in contact with the knock contact cam 85 of the cam member 83 (rotor 80). You cannot move forward any further. Therefore, the operation portion 33 of the operation body 30 also does not move forward any more. Therefore, the operator feels that the knock body 90 has reached the maximum pushing depth.

FIG. 7(e) shows the state immediately after the operator releases the pressing force on the operating portion 33 of the operating body 30 after reaching the maximum pressing depth.
When the operator releases pressure on the operation portion 33 of the operating body 30, the rear spring 60 urges the knock flange portion 96 of the knock body 90 rearward, so that the knock body 90 moves rearward.
Since the writing body 20 is also biased rearward by the front spring 40, it moves slightly rearward, and is pressed by the writing body 20 and the pusher 70 also moves slightly rearward.
When the pusher 70 moves rearward, the pusher cam 75 which is an inclined surface provided on the rear side of the pusher 70 changes to the pusher contact cam 84 which is an inclined surface provided on the front side of the cam member 83 of the rotor 80 . abut. In this state, the pusher cam 75 of the pusher 70 pushes the pusher contact cam 84 of the cam member 83 (rotor 80) rearward, so that the cam member 83 (rotor 80) contacts the pusher. Cam 84 slides along pusher cam 75 of pusher 70 and rotor 80 rotates in the direction of the arrow.

FIG. 8(a) shows a state following FIG. 7(e), in which the rotor 80 rotates, and the portion on the front side of the slide surface 86 of the cam member 83 (rotor 80), which is a flat surface extending in the direction of the axis A, is This shows a state where the rotor 80 comes into contact with the stepped surface 77 of the pusher 70, which is a flat surface extending in the direction of the axis A, and the rotation of the rotor 80 is stopped.
In this state, the pusher cam 75 of the pusher 70 is in contact with the pusher contact cam 84 of the cam member 83 (rotor 80), so the pusher 70 does not move further rearward.
At this time, the tip of the writing body 20 protrudes from the tip of the barrel 10 , and the rear end of the writing body 20 is in contact with the pusher pressing surface portion 71 of the pusher 70 . Since the pusher 70 does not move further to the rear side, the writing body 20 does not move to the rear side any more. That is, even if writing pressure is applied to the tip of the writing element 20, the tip does not retract into the barrel, so that writing is possible. This state is the writing state.

FIG. 10 shows the writing state as in FIG. 8(a). Since the knock flange portion 96 of the knock body 90 is biased rearward by the rear spring 60 , the knock body 90 is pushed by the rear spring 60 so that the rear surface of the knock flange portion 96 moves toward the rear shaft of the rear barrel 12 . It moves backward to the position of the cylindrical stepped portion 15 .
Then, the pressing portion 31 of the operating body 30 is also pushed rearward by being pushed by the knocking body 90, and the operating portion 33 of the operating body 30 is separated from the barrel 10 on the rear side of the barrel 10 even in the writing state. maintained in a state. Therefore, the ball-point pen 1 can maintain an excellent design in which the operation part 33 seems to be floating in the air even in the writing state.

FIG. 8(b) shows the start state of the operation from the writing state to the non-writing state. In other words, this is the starting state when the tip of writing body 20 is retracted from the tip of barrel 10 . When changing from the writing state to the non-writing state, the operator knocks the operating part 33 of the operating body 30 .
Then, the operating body 30 is moved forward by pressing the operating portion 33 . Since the pressing portion 31 of the operating body 30 presses the knock body 90 forward, the knock body 90, the pusher 70 and the writing body 20 move forward. At this time, the amount of movement of the knock body 90, the pusher 70 and the writing body 20 is smaller than when the non-writing state is changed to the writing state.

As shown in FIG. 8(b), the pusher cam 75 of the pusher 70, which is the slope on the rear side of the pusher 70, is separated from the pusher contact cam 84, which is the slope on the front side of the rotor 80, and the pusher A stepped surface 77 of the pusher 70, which is a plane extending in the direction of the axis A of 70, is separated from a sliding surface 86 of the cam member 83 (rotor 80), which is a plane extending in the direction of the axis A.
The knock cam 94 of the knock body 90, which is a slope provided on the front side of the knock body 90, and the knock contact cam 85 of the cam member 83 (rotor 80), which is a slope provided on the rear side of the rotor 80. abut.
Since the knock cam 94 of the knock body 90 presses the knock contact cam 85 of the cam member 83 (rotor 80 ) forward, the knock contact cam 85 slides along the knock cam 94 of the knock body 90 . This causes the rotor 80 to rotate in the direction of the arrow.

FIG. 8(c) shows a state in which the operator further knocks the operating portion 33 of the operating body 30 forward from the state shown in FIG. 8(b). As shown in FIG. 8(c), when the rotor 80 rotates, the slide surface 86 of the cam member 83 (rotor 80), which is a flat surface extending in the direction of the axis A, moves to the knock body 90, which is a flat surface extending in the direction of the axis A. As shown in FIG. abuts on the stepped surface 97 of the . Thereby, the rotation of the rotor 80 is stopped.
Here, the position of the rotor 80 is fixed in the direction of the axis A, and the knock cam 94 of the knock body 90 is in contact with the knock contact cam 85 of the cam member 83 (rotor 80). You cannot move forward any further. Therefore, the operation portion 33 of the operation body 30 also does not move forward any more.
Therefore, the operator feels that the knock body 90 has reached the maximum pushing depth. At this time as well, it is in the state of full knock.

FIG. 8(d) shows the state immediately after the operator releases the pressure on the operating portion 33 of the operating body 30 after reaching the maximum pressing depth. When the operator releases pressure on the operation portion 33 of the operating body 30, the rear spring 60 urges the knock flange portion 96 of the knock body 90 rearward, so that the knock body 90 moves rearward.
Since the writing body 20 is also biased rearward by the front spring 40, the writing body 20 moves rearward, and is pressed by the writing body 20 to move the pusher 70 rearward.
When the pusher 70 moves rearward, the pusher cam 75 which is an inclined surface provided on the rear side of the pusher 70 changes to the pusher contact cam 84 which is an inclined surface provided on the front side of the cam member 83 of the rotor 80 . abut.
In this state, the pusher cam 75 of the pusher 70 pushes the pusher contact cam 84 of the cam member 83 (rotor 80) rearward, so that the cam member 83 (rotor 80) contacts the pusher. Cam 84 slides along pusher cam 75 of pusher 70, and rotor 80 rotates in the direction of the arrow.

FIG. 8(e) shows a plunger 70 in which the rotor 80 rotates and the slide surface 86 of the cam member 83 (rotor 80), which is a plane extending in the direction of the axis A, is a plane extending in the direction of the axis A. The rotor 80 abuts against the side surface of the groove 76 and stops rotating.
In this state, the writing body 20 is further moved rearward by the front spring 40, so that the cam member 83 (rotor 80) moves relatively forward in the pusher groove 76 of the pusher 70 in the direction of the axis A. , the state shown in FIG. At this time, the tip of the writing body 20 is in a state of being retracted from the tip of the barrel.

As described above, the rotor 80 is in a non-biased state in the rotational direction, and the pusher contact cam 84 contacts the pusher cam 75 to move the pusher cam 75 from the front side to the rear side in the direction of the axis A. Only when pressed and when the knock contact cam 85 contacts the knock cam 94 and is pressed from the rear side to the front side in the direction of the axis A by the knock body 90 , it rotates due to cam engagement.
For example, unlike the first embodiment, if the rotor 80 is always urged in the rotational direction, the knocking noise when the rotor 80 comes into contact with another member will increase.
However, in the embodiment, the rotor 80 is not urged in the rotational direction and is rotated only by the engagement of the cam, so the impact when coming into contact with other members is small and the knocking noise is reduced.
Further, since the rotor 80 is in a non-biased state in the rotational direction, the resistance when the slide surface 86 of the rotor 80 moves in the pusher groove 76 when knocking is always urged in the rotational direction of the rotor 80. less compared to the current state. Therefore, knocking can be performed smoothly.

(Effect of Position of Clip Rotating Axis 38)
When knocking the operating body 30, a pressing force F is applied to press the operating portion 33 in the direction of the axis A as shown in FIG.
Here, as a comparative example, it is assumed that the clip rotating shaft of the operating body 30 is positioned at the center of the clip movement restricting portion 39 of the first embodiment. At this time, the pressing force F can be decomposed into a force in a direction toward the clip movement restricting portion 39 and a force in a radial direction around the clip movement restricting portion 39 indicated by Y1 in FIG. In the comparative example, the force Y1 in the radial direction is a force in the direction of lifting and opening the clip portion 36 from the barrel 10 . Therefore, in the comparative example, the clip portion 36 is lifted from the barrel 10 and opened when performing a click operation. If so, the operability is poor, the operation becomes unstable, and the operational feeling (knocking feeling) is impaired.

However, in the first embodiment, the clip rotating shaft 38 is provided at the end opposite to the clip portion 36 with the axis A interposed therebetween.
According to the first embodiment, when the operating body 30 is clicked, the pressing force F that presses the operating portion 33 in the direction of the axis A is the force in the direction toward the clip rotating shaft 38, and the force in the direction toward the clip rotating shaft 38. It can be decomposed into a radial force about axis 38 and a radial force. In the embodiment, the radial force Y2 is a force in a direction that brings the clip portion 36 closer to the barrel 10 .
Therefore, in the first embodiment, the clip portion 36 is not lifted from the barrel 10 and opened when the click operation is performed. Therefore, the operability is good, the operation is stable, and the operational feeling (knocking feeling) is not impaired.

Furthermore, since the operating portion 33 extends up to the axis A, the pressing force is sufficiently transmitted when the operating portion 33 is pressed.

Further, according to the operation body 30 of the first embodiment, the knocking operation can be performed not only by knocking the operation portion 33 at the rear end, but also by moving the clip portion 36 forward.

Although the first embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible. For example, although the connecting portion 35 and the clip portion 36 of the operating body 30 of the first embodiment extend linearly parallel to the outer surface of the barrel 10, they are not limited to this and may be curved. Moreover, although the shape of the operation part 33 is a truncated cone shape, it may be another shape such as a cylindrical shape.

Further, the front barrel 11 and the rear barrel 12 may be integrally constructed.
Further, the rear spring 60 is not provided, and the operation portion 33 is not separated from the rear end of the barrel 10 in the writing state when knocking is not knocked, and the operation portion 33 is moved behind the barrel 10 in the non-writing state when knocking is not performed. It may be designed such that the operation part 33 is floating in the air away from the end.

(Second embodiment)
A writing instrument according to a second embodiment of the present invention will be described below. In the second embodiment, a mechanical pencil 200 will be described as an example of a writing instrument. 11 is a cross-sectional view of the mechanical pencil 200, and FIG. 12 is an enlarged view of the front portion of FIG.

The mechanical pencil 200 includes a barrel 210, an inner barrel 50 accommodated inside the barrel 210, a lead tank 250 arranged inside the inner barrel 50, and a writing body accommodated inside the lead tank 250. A writing lead 220 is provided.
Further, the mechanical pencil 200 includes a tip operation mechanism 300 that projects the tip of the writing lead 220 from the tip of the barrel 210, and a tip operation mechanism 300 that moves back and forth with respect to the barrel 210 by a predetermined stroke length. , a clip spring 110 that biases the operating body 30 , and a tail plug 120 arranged at the rear end of the distal end operating mechanism 300 .

In the second embodiment, the operation body 30, inner cylinder 50, rear spring 60, clip spring 110, and tail plug 120 are the same as in the first embodiment. Hereinafter, the same reference numerals are assigned to the same parts as in the first embodiment, and the description thereof is omitted.

(Knock body 290)
The knock body 290 of the second embodiment does not have the knock cam 94 on the front surface of the front wall 91b, and the knock tube 294 extends. Like the knock body 90 of the first embodiment, the knock body 290 is urged rearward by the rear spring 60 and its rearward movement is restricted by the rear barrel stepped portion 15 inside the rear barrel 12 .

(Axle tube 210)
A barrel 210 of the second embodiment includes a front barrel 211 , a rear barrel 12 , and a base 280 arranged inside the front barrel 211 .
In addition to the first female screw portion 11b being provided on the inner circumference of the front barrel 211, a second female screw portion 11b is provided in a portion having a smaller inner diameter on the front side than the portion where the first female screw portion 11b is provided. A female screw portion 211c is provided.

(Clasp 280)
The mouthpiece 280 is a tubular member having a substantially truncated cone shape with a through hole 281 having an inner diameter that decreases toward the distal end side, and an outer circumference that also decreases toward the distal end side. The tip of the writing lead 220, which is a cursive body, protrudes from the tip of the through hole 281 by the knocking operation.
A screw portion 282 is provided on the inner surface of the rear end of the through hole 281 of the base 280 . The threaded portion 282 is screwed into a first male threaded portion 271a of a small outer diameter portion 271 of the connector 270, which will be described later.

(Tip operation mechanism 300)
In the second embodiment, the tip operation mechanism 300 is a mechanism for projecting the tip of the writing core 220, which is a cursive body, with respect to the tip of the base 280 of the barrel 210. As shown in FIG.
The tip operation mechanism 300 includes a lead tank 250 that accommodates a writing lead 220 therein, and an eraser holder 251 arranged behind the lead tank 250. The eraser holder 251 holds an eraser 252.

(wick tank 250)
The wick tank 250 is arranged inside the inner cylinder 50 . The lead tank 250 is cylindrical and can accommodate a plurality of writing leads 220 inside.

(Eraser holder 251)
The eraser holder 251 has a small outer diameter portion 251a on the front side and a large outer diameter portion 251b on the rear side. The small outer diameter portion 251 a is inserted into the rear end of the lead tank 250 . An eraser 252 is inserted inside the large outer diameter portion 251b. When knocking, the rear end surface of the large outer diameter portion 251b is abutted and pressed by the knock cylinder 294. As shown in FIG.

The tip operation mechanism 300 also includes a joint 260 press-fitted inside the tip of the core tank 250 , a connector 270 arranged on the outer periphery of the joint 260 , and a front spring 240 fitted to the joint 260 .

(Joint 260)
The joint 260 has a small outer diameter portion 261, a flange portion 262 and a large outer diameter portion 263 from the front side. The front side inside the joint 260 holds the rear end of the chuck 230 which will be described later.

(Connector 270)
The connector 270 has a small outer diameter portion 271, a middle outer diameter portion 272 and a large outer diameter portion 273 from the front side. A first male screw portion 271 a is formed on the outer circumference of the small outer diameter portion 271 , and a second male screw portion 272 a is formed on the outer circumference of the medium outer diameter portion 272 . The second male screw portion 272 a is screwed with the second female screw portion 211 c of the front barrel 211 , and the connector 270 is fixed to the front barrel 211 . The first female screw portion 11b of the front barrel 211 is detachably screwed with the male screw portion 51 of the inner barrel 50 integrated with the rear barrel 12 . By removing the front barrel 211, a portion including the wick tank 250 housed inside the barrel 210 can be taken out.
Inside the connector 270, a first inner diameter portion 274, a second inner diameter portion 275, a third inner diameter portion 276, a fourth inner diameter portion 277, and a fifth inner diameter portion 278 are provided from the front side. The first inner diameter portion 274 has a larger diameter than the second inner diameter portion 275 . Further, the diameters of the second inner diameter portion 275, the third inner diameter portion 276, the fourth inner diameter portion 277, and the fifth inner diameter portion 278 increase in this order. In the second embodiment, the diameter of the first inner diameter portion 274 is larger than the diameter of the third inner diameter portion 276 and smaller than the diameter of the fourth inner diameter portion 277 .

(front spring 240)
The front spring 240 is mounted on the small outer diameter portion 261 of the joint 260, and extends between the front surface of the flange portion 262 of the joint 260 and the wall portion of the connector 270 between the fifth inner diameter portion 278 and the fourth inner diameter portion 277. held in between.
The front spring 240 presses the chuck 230, the chuck ring 235, the joint 260, the lead tank 250, and the eraser holder 251 rearward by urging the front surface of the flange portion 262 of the joint 260 rearward. Joint 260 is integrated with chuck 230 , lead tank 250 and eraser holder 251 .

The tip manipulation mechanism 300 further includes a breaker 285 , a chuck ring 235 and a chuck 230 .

(Chuck 230)
The chuck 230 is a cylindrical member that is held inside the connector 270 and whose rear end is inserted into the front side of the lead tank 250 and held. A large-diameter portion 231 having a gradually increasing outer diameter is provided on the tip side of the chuck 230. The large-diameter portion 231 is formed with notches (not shown) extending parallel to the axis A, and a plurality of slits are formed in the circumferential direction. It is divided (divided into three in the first embodiment).

(Chuck ring 235)
The chuck ring 235 is a cylindrical member whose inner diameter gradually increases on the distal end side. The chuck ring 235 is a member for opening and closing the chuck 230 . Except when knocking, the chuck ring 235 covers the outer periphery of the large-diameter portion 231 of the chuck 230 protruding from the tip of the connector 270 and is positioned at the first inner diameter portion 274 of the connector 270 so that the chuck 230 is positioned relative to the connector 270. You are restricted from moving backwards.
The outer surface on the rear side of the chuck 230 is fitted with the inner surface on the front side of the joint 260 . The joint 260 is urged backward against the connector 270 by the front spring 240 , and the large diameter portion 231 of the chuck 230 is held by the chuck ring 235 .
When the outer circumference of the large diameter portion 231 is held by the chuck ring 235, the inner diameter of the large diameter portion 231 of the chuck 230 is reduced and closed. As a result, the chuck 230 becomes capable of holding the writing lead 220 inside.
When the large-diameter portion 231 moves forward of the chuck ring 235, the chuck ring 235 is released and the large-diameter portion 231 is separated from each other, so that the inner diameter of the large-diameter portion 231 is expanded and the large-diameter portion 231 is opened. This allows the writing lead 220 to move back and forth.

(breaker 285)
The breaker 285 is held inside the base 280, has a through hole, and is made of an elastic material such as rubber.

(when not knocking)
As in the first embodiment, also in the second embodiment, the front spring 240 and the rear spring 60 urge the knock body 290 and the operation body 30 rearward when not knocking, and the entire operation part 33 is pivoted. It is spaced apart from the rear end of the tube 210 .
In this manner, the operation portion 33 is separated from the rear end of the barrel 210 when not knocked, and a gap is provided between the operation portion 33 and the barrel 210, so that the operation portion 33 appears to be floating in the air. , has excellent design features.
At this time, the joint 260 is urged rearward by the front spring 240, and the outer circumference of the large diameter portion 231 of the chuck 230 is held by the chuck ring 235, so that the inner diameter of the large diameter portion 231 of the chuck 230 is reduced. It is in a closed state. Thereby, the chuck 230 can hold the writing lead 220 inside.

(when knocking)
As in the first embodiment, also in the second embodiment, when knocking, the operating portion 33 of the operating body 30 moves forward and partially enters the rear end of the barrel 210 .
At this time, the pressing portion 31 presses the knock body 290 forward. Then, the lead tank 250 is pressed to the tip side via the eraser holder 251 . The flange portion 262 of the joint 260 is also pressed toward the distal end. At this time, the front spring 240 is compressed together with the rear spring 60 . As a result, the chuck 230 held on the tip side of the joint 260 moves to the tip side while holding the writing lead 220, the writing lead 220 moves to the tip side through the inside of the breaker 285, and the writing lead 220 moves to the tip side through the breaker 285. held by
The chuck ring 235 moves forward together with the chuck 230, but since it has a larger diameter than the chuck 230, it abuts on the inner surface of the mouthpiece 280 in the middle, and further forward movement is restricted. Therefore, only the chuck 230 moves further forward.
When the large-diameter portion 231 of the chuck 230 moves forward from the chuck ring 235, the plurality of divided portions are separated from each other, so that the inner diameter is increased and the chuck is opened.

(at the end of knocking)
When the knocking action is completed and the pressing of the pressing portion 31 on the knocking body 290 is released, the front spring 240 and the rear spring 60 again urge the knocking body 290 and the operation body 30 rearward, and the operation portion is closed. The entire 33 is separated from the rear end of the shaft cylinder 210, and a gap is formed between the operation part 33 and the shaft cylinder 210, so that the operation part 33 is floating in the air. .
At this time, the pressure on the leading end side of the lead tank 250 and the pressure on the leading end side of the flange portion 262 of the joint 260 are released. Then, the spring force of the front spring 240 presses the flange portion 262 of the joint 260 to move the joint 260 rearward.
The chuck 230 that has released the writing lead 220 moves rearward together with the joint 260, but the writing lead 220 held by the breaker 285 does not move rearward.
While the chuck 230 is moving rearward, the outer circumference of the large diameter portion 231 of the chuck 230 is again held by the chuck ring 235 . Therefore, the inner diameter of the large-diameter portion 231 of the chuck 230 is reduced and closed. As a result, the writing lead 220 is held inside the chuck 230 . Therefore, since the writing lead 220 does not retreat, writing is possible when the writing lead 220 protrudes from the tip of the base 280 by a predetermined length.

Although preferred embodiments of the writing instrument of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.
For example, in the first embodiment, the distal end operating mechanism 100 includes the front spring 40 , the inner cylinder 50 , the pusher 70 , the knock body 90 , and the rotating mechanism disposed between the pusher 70 and the knock body 90 . Although the pressing portion 31 that includes the child 80 and the rear spring 60 and constitutes the operation body 30 presses the knocking body 90, the present invention is not limited to this. That is, the knocking body and the pressing portion may be integrally configured (that is, the knocking body may be configured as a part of the operation body). In this case, the knock body that constitutes the operating body serves as a pressing portion that presses the distal end operating mechanism (presser 70).

Also in the second embodiment, the tip operation mechanism 300 is configured to include the knock body 290, the eraser holder 251, and the lead tank 250, and the pressing part 31 constituting the operation body 30 presses the knock body 290. It is not limited to this. That is, the knocking body and the pressing portion may be integrally configured (that is, the knocking body may be configured as a part of the operation body). In this case, the knock body that constitutes the operating body serves as a pressing portion that presses the tip operating mechanism (eraser holder 251).

A: axis, B: rotation axis 1: ballpoint pen 10: barrel 20: writing body 24: spring receiving surface 30: operating body 31: pressing portion 32: first arm (connecting portion) 32a: spring Pressing surface, 33: operation part, 34: second arm (connecting part), 35: connecting part (connecting part), 36: clip part, 37: protrusion, 38: clip rotation shaft, 39: clip movement regulation Portion 40: Front spring 50: Inner cylinder 52: Stepped portion 54: Notch 55: Extended portion 56: Rear end projecting portion 57: Outer circumferential projection 58: Inner circumferential projection 60: Rear spring 70: Pusher, 71: Pusher pressing surface portion, 72: Slide portion, 73: Cylindrical portion, 74: Cam forming thick portion, 75: Pusher cam, 76: Pusher groove, 77: Step surface 80: Rotor , 81: rotor large-diameter portion, 82: rotor small-diameter portion, 83: cam member, 84: presser contact cam, 85: knock contact cam, 86: slide surface 90: knock body, 91: pressing portion housing Chamber 91a: Side wall 91b: Front wall 91c: Engagement protrusion 91d: Shaft holding recess 91e: Movable recess 94: Knock cam 95: Knock slide portion 96: Knock flange portion 97: Step surface : tip operation mechanism 110: clip spring 120: tail plug 121: rear wall 122: engagement wall 123: base 124: engagement hole 200: mechanical pencil 210: barrel 211: front barrel 220 : writing lead (cursive), 230: chuck, 235: chuck ring, 240: front spring, 250: lead tank, 251: rubber holder, 252: eraser, 260: joint, 262: flange, 270: connector, 280: Base, 285: Breaker, 290: Knock body, 300: Tip operation mechanism

Claims (7)

A knock-type writing instrument comprising a barrel housing a cursive body therein,
a tip manipulation mechanism that causes the tip of the writing body to protrude from and retract into, or at least protrude from, the tip of the barrel;
and an operation body that operates the tip operation mechanism,
The operating body is
an operating portion disposed on the rear side of the barrel in the axial direction and spaced apart from the rear end of the barrel at least in a non-writing state when knocking is not performed;
disposed inside the barrel and interlocked with the operating portion when the operating portion is knocked;
a pressing portion that presses the distal end operating mechanism;
A writing instrument with The operation unit is arranged at a position passing through the axis,
The writing instrument according to claim 1. A part of the operation part enters the interior of the barrel from the rear end of the barrel when knocked.
The writing instrument according to claim 1 or 2. The operating body is
Having a connecting portion that connects the pressing portion and the operating portion,
The writing implement according to any one of claims 1 to 3. The operating body is
a clip portion extending forward on the outer side of the shaft tube continuously from the connecting portion;
The writing instrument according to claim 4. The operating body is
The front side of the clip portion is rotatable about a clip rotating shaft extending in a direction perpendicular to the axis so that the front side of the clip portion is separated from the shaft cylinder,
The writing instrument according to claim 5. The connecting part is U-shaped,
The writing implement according to any one of claims 4 to 6.

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