JP5933960B2 - Knock-type writing instrument - Google Patents

Description

  The present invention relates to a knock type writing instrument that can be suitably used for, for example, a mechanical pencil capable of feeding out a writing core (replacement core) from the tip end side of a shaft cylinder by a knocking operation.

The mechanical pencil described above is operated by knocking the knock operation portion protruding to the rear end side of the shaft cylinder, and this knock operation is transmitted to the writing core feeding mechanism including the chuck through the core case, for example. It acts so that the writing core is sequentially drawn out from the tip side of the.
Therefore, according to this type of knock-type mechanical pencil, when the drawn-out lead is worn to some extent by the writing operation, the knocking operation is performed again and the lead-out operation is performed.

When the writing core is extended by this knocking operation, it is necessary to pick up the shaft cylinder from the written state and knock the knocking operation part protruding from the rear end of the shaft cylinder with the thumb or the like. However, the user may feel troublesome in the knocking operation.
Therefore, a side knock type mechanical pencil that can be arranged so that a knock operation portion protrudes from the side surface of the shaft cylinder and knocks the knock operation portion on this side surface to draw out the writing core is disclosed in Patent Document 1. And 2 are proposed.

According to the side knock type mechanical pencil, the knock operation portion can be knocked without greatly changing the gripping posture of the shaft cylinder in the writing state.
However, according to the side knock type mechanical pencil, it is necessary to separately provide a cam mechanism or the like for converting a knock operation performed in a direction orthogonal to the longitudinal direction into an operation in which the lead case moves forward. There will be an increase in assembly man-hours, and there will be a problem that the outer diameter of the shaft cylinder must be increased to some extent in order to provide a cam mechanism and the like.

Japanese Patent Laid-Open No. 9-207491 JP 11-254881 A

  The present invention can solve the above-mentioned problems that the side knock type mechanical pencil has, and, for example, when performing a knocking operation for feeding out the writing core, the gripping posture of the shaft tube in the writing state can be changed. An object of the present invention is to provide a knock type writing instrument capable of performing a knock operation without greatly changing.

The knock type writing instrument according to the present invention, which has been made to solve the above-mentioned problems, protrudes from the rear end portion of the shaft cylinder, knocks the writing body from the front end side of the shaft cylinder by knock operation, and the knock operation And a protrusion that protrudes from the side surface of the shaft cylinder and is movable in the axial direction together with the knock operation portion. The protrusion is more axial than the rear end portion of the knock operation portion. The protrusion is formed integrally with the knock operation part via a connection neck so that the protrusion is positioned on the front end side, and the protrusion has a thickness increased on both sides with the connection neck as the center. A substantially uniform gap is formed between the cylindrical cylinder .

In this case, in a preferred form, the width of the coupling neck between the knocking operation part and the protrusion is small rather is set than the width of the knocking operation part and projections, from the rear end of the barrel It arrange | positions so that the said connection neck part can move in the notch groove | channel formed linearly toward the front.

In addition, the connection neck portion located in the notch groove provided in the shaft cylinder protrudes toward the inner surface opposite to the notch groove at positions on both sides of the notch groove. It is preferable that a protrusion is formed, and that only the protrusion formed on the connection neck portion is in contact with each inner surface of the notch groove.
In this case, more preferably, each protrusion formed on the connection neck portion is configured to protrude longer in the axial direction.

And as said knock operation part which protrudes in the rear-end part of a shaft cylinder, it can comprise with the knock cover attached to the knock bar which transmits knock operation so that attachment or detachment is possible in an axial direction.
In addition, preferably, a decorative member that is a separate part from the protrusion is attached to the protrusion in a recess formed in the center of the outward surface. Furthermore, in one preferable form, the said projection part is formed in disk shape by planar view.

  According to the above-described knock type writing instrument according to the present invention, the knock operation part protruding from the rear end part of the shaft cylinder and the protrusion part protruding from the side surface of the shaft cylinder and movable in the axial direction together with the knock operation part are one part. Since the projection is configured to be positioned closer to the front end side in the axial direction than the rear end portion of the knock operation portion, when this is employed for a mechanical pencil, for example, in the writing state The protruding portion can be knocked with a thumb or the like without greatly changing the gripping posture of the shaft cylinder, whereby the core as a writing body can be extended.

Further, in the notch groove formed linearly from the rear end portion of the shaft tube forward, the connecting neck portion that connects the knock operation portion and the projection portion is arranged to be movable, By configuring the protruding inner surface formed in the connecting neck portion to contact the inner surface of the notch groove, a part of the protruding portion is brought into contact with the shaft cylinder by a knocking operation. It can be effectively prevented.
Thereby, it can prevent damaging the surface covering by the coating, transcription | transfer, etc. which were given to the said axial cylinder and the projection part, and can contribute to protecting the external appearance of a writing instrument.

It is a perspective view which shows the example employ | adopted as the mechanical pencil about the knock type writing instrument which concerns on this invention. It is sectional drawing which showed the first half part of the mechanical pencil shown in FIG. It is sectional drawing which showed the latter half part similarly. It is the perspective view which showed the external appearance structure of the knock cover provided with the projection part. It is the perspective view which cut off the projection part and showed the wearing state of the knock cover. It is the expansion perspective view shown in the state where a part of connecting neck which connects a knock cover and a projection part was fractured.

As for an example of the knock type writing instrument according to the present invention, an embodiment in which this is adopted as a mechanical pencil will be described first, and a detailed configuration of a knock cover provided in the mechanical pencil will be described later.
In the following drawings, the same parts are denoted by the same reference numerals. However, in some drawings, representative parts are denoted by reference numerals for convenience of the paper, and the detailed configuration is attached to the other drawings. In some cases, the reference numerals are quoted for explanation.

  First, FIGS. 1 to 3 illustrate the overall configuration of the mechanical pencil. A base 2 is screwed to the tip of the front shaft 1 constituting the shaft cylinder, so that the front shaft 1 can be screwed. Removably attached. A cylindrical core case 3 is accommodated along the front shaft 1 and the axis of the rear shaft described later, and a short-axis core case joint 4 is attached to the tip of the core case 3. A brass chuck 5 is connected through a core case joint 4.

A writing hole (not shown) is formed in the chuck 5 along its axis, and the tip is divided into a plurality of pieces, and the divided tip is formed into a ring shape by brass. It is loosely fitted in the tool 6. Further, the ring-shaped fastener 6 is attached to the inner surface of the distal end portion of the relay pipe 7 disposed so as to cover the periphery of the chuck 5.
The rear end portion of the relay pipe 7 is connected to a rotation drive mechanism (described later) that rotates the writing core (replacement core) using the writing pressure.

A cylindrical slider 8 that is accommodated in the base 2 and protrudes from the base 2 is fitted to the relay pipe 7 at the front end of the relay pipe 7 so that the relay pipe 7 is detachable. Further, a tip pipe 9 for guiding the writing core is attached to the front end portion of the slider 8 via a pipe holder 10.
Further, immediately after the pipe holder 10 on the inner peripheral surface of the slider 8, a rubber holding chuck 12 having a through hole formed in the shaft core portion is accommodated.

  With the above-described configuration, a linear core insertion hole reaching the tip pipe 9 through a through hole formed in the chuck 5 following the core case 3 and a through hole formed in the shaft core of the holding chuck 12 is provided. A writing core (not shown) is inserted into the linear core insertion hole. A coiled chuck spring 13 is disposed between the relay pipe 7 and the core case joint 4.

  That is, the front end portion of the chuck spring 13 abuts on an annular step formed on the inner peripheral surface of the relay pipe 7, and the rear end portion of the chuck spring 13 abuts on the front end surface of the core case joint 4. It is housed in the state. Therefore, due to the action of the chuck spring 13, the chuck 5 is urged in the direction in which the relay pipe 7 is retracted and the tip end is accommodated in the ring-shaped fastener 6, that is, in the direction in which the writing core is gripped. Has been.

A grip member 14 made of an elastic material such as rubber is mounted on the above-described front shaft 2 constituting the shaft cylinder so as to surround the front shaft 2. When the grip member 14 is mounted on the front shaft 2, a transparent ring 15 formed of a transparent resin material that functions as a decorative ring is mounted from the front end side of the front shaft 2.
The transparent ring 15 is positioned by an annular flange 1a formed integrally with the front shaft, and then the grip member 14 is mounted so as to surround the front shaft 2 from the same direction. Thereafter, the base 2 is screwed into the front end portion of the front shaft 1 so that the transparent ring 15 and the grip member 14 are attached to the front shaft 1 without coming off in the axial direction.

The transparent ring 15 functioning as the decorative ring described above is configured so as to cover the decorative seal 16 that is pasted so as to be wound around the front shaft 1 in advance so that the peripheral surface of the seal 16 can be visually recognized. Yes.
The decorative seal 16 is printed with a glossy color such as gold or silver, and a transparent portion that is not printed is formed at an appropriate position. And it is comprised so that a part of internal relay pipe 7 can be visually recognized through the said front axis | shaft 1 shape | molded by this transparent part and the transparent resin raw material.
Thereby, it is possible to confirm through the transparent ring 15 how the relay pipe 7 is rotationally driven by a rotational drive mechanism described later.

An inner surface of a front end portion of a rear shaft 18 constituting a shaft cylinder is fitted and attached to the rear end portion of the front shaft 1 described above, and the front half portion of the rear shaft 18 is shown in FIG. Thus, the unitized rotation drive mechanism 21 is accommodated.
As described above, the rear end portion of the relay pipe 7 is connected to the rotation drive mechanism 21, and the relay pipe 7 performs the retraction and forward movement (cushion movement) of the writing core based on the writing movement via the chuck 5. In response to this, it is transmitted to the rotational drive mechanism 21 and acts to transmit the rotational movement caused by the cushion operation by the rotational drive mechanism 21 to the chuck 5 via the relay pipe 7.
As a result, a writing core (not shown) gripped by the chuck 5 is subjected to a rotational motion by the rotational drive mechanism 21 in accordance with the writing operation.

The rotary drive mechanism 21 is urged rearward by a shaft spring 22 interposed between the front shaft 1 and the front shaft 1. The rear end portion of the rotary drive mechanism 21 is in contact with the step portion 18 a formed by the reduced diameter in the rear shaft 18 by the biasing force of the shaft spring 22.
That is, in this embodiment, the rotation drive mechanism 21 that is unitized is restricted from rotating by friction due to contact with the step portion 18a in the rear shaft 18, and the rotation drive mechanism generated by the cushion operation described above. It acts to transmit the rotational motion by 21 to the chuck 5 side.

  The rotary drive mechanism 21 includes a rotor 24 formed in a cylindrical shape, and the relay pipe 7 is fitted to the inner peripheral surface of the rotor 24 at the front end portion of the rotary drive mechanism 21. Are combined.

  The rotor 24 has a large-diameter portion with a slightly larger diameter near the front end, and a first cam surface 24a is formed on one end surface (rear end surface) of the large-diameter portion. A second cam surface 24b is formed on the other end surface (front end surface). On the other hand, a cylindrical upper cam forming member 25 is disposed so as to cover the rear end side of the rotor 24 so as to rotatably support the rotor 24, and the upper cam forming member 25. A cylindrical lower cam forming member 26 is fitted and attached to the upper cam forming member 25 on the outer periphery of the front end portion.

  A first fixed cam surface 25a is formed on the front end surface of the upper cam forming member 25 facing the first cam surface 24a of the rotor 24. Further, a second fixed cam surface 26a is formed on the inner surface of the front end portion of the lower cam forming member 26 facing the second cam surface 24b of the rotor 24.

A cylinder member 27 is fitted to the upper cam forming member 25 on the rear end side of the upper cam forming member 25. The cylinder member 27 is formed in a cylindrical shape and is movable in the axial direction. A torque canceller 28 is disposed, and a coiled cushion spring 29 is mounted between the front end portion of the inner peripheral surface of the torque canceller 28 and the rear end portion of the inner peripheral surface of the cylinder member 27.
The cushion spring 29 acts to urge the torque canceller 28 forward, and is pushed by the torque canceller 28 that has received this urging force so that the rotor 24 acts forward.

  As described above, the rotation drive mechanism 21 is separated from the core case 3 by the central portion of the rotation drive mechanism 21 passing through the core case 3, and the rotation drive mechanism 21 is indicated by the reference numerals 25 to 29 described above. It is unitized by members.

A knock bar 31 is slidably mounted in the axial direction on the rear half of the rear shaft 18, that is, on the rear side of the rotary drive mechanism 21. A front end portion of the knock bar 31 is formed as an annular wedge-shaped protrusion 31a, and the wedge-shaped protrusion 31a is mounted so as to ride over an annular protrusion 18b formed in the rear shaft 18.
A coiled knock bar spring 32 is disposed between the annular protrusion 18b and the knock bar 31, and the spring 32 urges the knock bar 31 toward the rear end of the rear shaft 18. It is configured.

  Further, an abutting portion 31b having a writing core replenishing hole 31c is formed slightly closer to the rear end than the center of the knock rod 31, and an eraser 33 is provided at the rear end of the knock rod 31. Is attached in a detachable manner, and a knock cover 34 functioning as a knock operation portion so as to cover the eraser 33 is detachably attached to the peripheral surface of the rear end portion of the knock bar 31.

  The contact portion 31b of the knock bar 31 and the rear end portion of the core case 3 are opposed to each other with a predetermined interval. According to this structure, even if the chuck 5 and the lead case 3 are slightly retracted by the cushioning operation described above, the rear end portion of the lead case 3 does not collide with the contact portion 31b of the knock bar 31. It is possible to prevent the rotation operation by the rotation drive mechanism 21 from being obstructed.

The knock cover 34 detachably attached to the knock bar 31 is integrally formed with a disk-shaped protrusion 34 a on the side wall surface of the knock cover 34. The disk surface of the disk-shaped projection 34a is circular and has a central portion that is slightly convex, and a resin fill seal 35 that is different from the knock cover 34 is mounted.
A notch groove 18c is formed in a part of the rear end portion of the rear shaft 18 in the circumferential direction, and a connecting neck portion for connecting the knock cover 34 and the disc-shaped protrusion 34a is formed in the cut portion 18c. By moving along the notch groove 18c, the knock cover 34 can be knocked.

The disc-shaped protrusion 34a formed integrally with the knock cover 34 functions as a decoration by the resin pile seal 35, and also functions as a rolling stop for the mechanical pencil.
A detailed configuration including the knock cover 34 and the disk-shaped protrusion 34a will be described later with reference to FIGS.

  According to the rotary drive mechanism 21 in the mechanical pencil configured as described above, the rotor 24 is centered on the shaft core together with the chuck 5 via the relay pipe 7 in a state where the chuck 5 holds the writing core. It is made rotatable. When the mechanical pencil is in a state other than the writing state, the rotor 24 is biased forward via the torque canceller 28 by the action of the cushion spring 29 arranged in the rotation drive mechanism 21.

  On the other hand, when a mechanical pencil is used, that is, when a writing pressure is applied to the writing core protruding from the tip pipe 9, the chuck 5 moves backward against the urging force of the cushion spring 29. Thus, the rotor 24 is also slightly retracted in the axial direction. Therefore, the first cam surface 24a formed on the rotor 24 is brought into mesh with the first fixed cam surface 25a.

The first cam surface 24a is continuously serrated along the circumferential direction, and the first fixed cam surface 25a is also continuously serrated along the circumferential direction. Are formed to be identical to each other.
The opposed first cam surface 24a and fixed cam surface 25a are set so as to have a half-phase (half-pitch) offset in the axial direction with respect to one tooth of the cam, as described above. The first cam surface 24a is joined to the first fixed cam surface 25a so as to mesh with each other, so that the rotor 24 is driven to rotate corresponding to a half phase (half pitch) of one tooth of the first cam surface 24a. Receive.

On the other hand, the second cam surface 24b is also continuously serrated along the circumferential direction, and the second fixed cam surface 26a is also continuously serrated along the circumferential direction, The pitches are formed to be the same.
As described above, in the state where the first cam surface 24a is joined to the first fixed cam surface 25a so as to be engaged with each other, the second cam surface 24b and the second fixed cam surface 26a facing each other. Is set so as to have a half-phase (half-pitch) offset with respect to one tooth of the cam in the axial direction.

  Accordingly, when the writing of one stroke is completed and the writing pressure on the writing core is released, the rotor 24 advances slightly in the axial direction by the action of the cushion spring 29 described above, and the second formed on the rotor 24. The cam surface 24b meshes with the second fixed cam surface 26a. As a result, the rotor 24 again receives the rotational drive in the same direction corresponding to the half phase (half pitch) of one tooth of the second cam surface 24b.

As described above, according to the above-described mechanical pencil, the rotor 24 has one tooth (the first cam surface 24a and one second cam surface 24b) along with the reciprocating motion of the rotor 24 in the axial direction by receiving the writing pressure. The writing core gripped by the above-described relay pipe 7 and chuck 5 is also rotationally driven in one direction in the same manner.
Therefore, the tip of the writing core is always conical due to the rotational movement received by itself and the wear caused by writing. Therefore, it is possible to prevent the writing core from being unevenly worn as the writing progresses, and writing with a stable line width is possible.

  In the rotary drive mechanism 21 described above, a torque canceller 28 is interposed between the rotor 24 and the cushion spring 29. The torque canceller 28 acts to prevent the rotational motion of the rotor 26 from being transmitted to the cushion spring 29 side by generating a slip between the rear end portion of the rotor 24. As a result, the problem that the rotating operation of the rotor 24 is obstructed by the twisted return (spring torque) of the spring 29 can be solved.

  Further, in the mechanical pencil having this configuration, when the knock cover 34 is knocked, the knock bar abutting portion 31b pushes the lead case 3 forward, and a part of the slider 8 attached to the relay pipe 7 is a base. 2 is abutted and the forward movement is blocked. For this reason, the front-end | tip part of chuck | zipper 5 protrudes relatively from the fastener 6, and the holding state of the writing core by the chuck | zipper 5 is cancelled | released. When the knocking operation is released, the lead case 3 and the chuck 5 are retracted in the shaft cylinder by the action of the chuck spring 13.

  At this time, the writing core is held by friction in a through hole formed in the holding chuck 12, and in this state, the chuck 5 is retracted and its tip is accommodated in the fastener 6. The core is again held. That is, the chuck 5 is moved back and forth by repeating the knocking operation of the knock cover 34, whereby the writing core is released and gripped, and the writing core acts so as to be sequentially advanced forward from the chuck 5.

4 to 6 are enlarged views showing a configuration including the knock cover 34 functioning as the knock operation portion described above and a disk-shaped protrusion 34 a formed integrally with the knock cover 34.
As already described with reference to FIG. 3, the knock cover 34 that functions as a knock operation unit covers the rear end of the knock bar 31 and is detachably attached to the knock bar 31 in the axial direction. The shaft 18) protrudes from the rear end.

As shown in FIG. 4, the disk-shaped protrusion 34 a is integrally molded with a resin through a connection neck 34 b having a width smaller than the width of the knock cover 34 and the protrusion 34 a, The protrusion 34 a is configured to be positioned closer to the front end side in the axial direction than the rear end (top end) of the knock cover 34.
In addition, the outward surface of the protrusion 34a is configured to be substantially parallel to the axial direction, and a circular recess is formed in the central portion leaving the outer peripheral edge 34c of the surface. A resin pile seal 35 (see FIGS. 1 and 3), which is a separate part with a slightly convex portion, is fitted and mounted.

Further, the surface of the protrusion 34a facing the knock cover 34 is formed so that the both sides of the connecting neck 34b are slightly thicker along the shaft center with the connecting neck 34b as the center. When mounted on the main body, a substantially uniform gap is formed between the cylindrical shaft cylinder (rear shaft 18).
In addition, the code | symbol 34e shown in FIG. 4 has shown the ventilation hole formed in the top end part of the knock cover 34. FIG.

As shown in FIG. 5 with the protruding portion 34a cut away, the connecting neck portion 34b for connecting the protruding portion 34a to the knock cover 34 is composed of a columnar body having a slightly longer shape in the axial direction. When operated, the rear shaft 18 is configured to move in the axial direction along a notch groove 18c formed linearly from the rear end portion of the rear shaft 18 toward the front.
In addition, projecting bodies 34d that are long and projecting in the axial direction are integrally formed at positions on both sides of the connecting neck portion 34b facing the notch groove 18c.

That is, the connecting neck portion 34b located in the notch groove 18c has an inner surface opposite to the notch groove (indicated by the same reference numeral 18c as the notch groove) on both sides of the notch groove 18c. ) Projecting bodies 34d projecting toward each other.
With this configuration, only the projecting body 34d formed on the connection neck portion 34b comes into contact with each inner side surface 18c of the notch groove.

  As described above, according to the above-described embodiment, the knock cover 34 that functions as the knock operation portion is integrally formed with the protrusion 34a so as to be positioned in front of the rear end portion of the knock cover. The protrusion 34a can be knocked with the thumb or the like without greatly changing the gripping posture of the shaft tube in the writing state, and the lead feeding operation due to the wear of the writing core can be performed without reducing the writing efficiency. It can be done smoothly.

Further, according to the above-described embodiment, the connecting neck portion for connecting the knock cover 34 and the protruding portion 34a in the notch groove 18c formed linearly forward from the rear end portion of the shaft tube. 34b is configured to be movable, and only the projecting body 34d formed on the connecting neck portion 34b is in contact with the opposing inner surface of the notch groove 34b.
According to this configuration, even if a knocking operation is performed to rotate the protrusion 34a in the axial direction, for example, a part of the protrusion 34a excluding the protrusion 34d becomes a part of the shaft tube by the action of the protrusion 34d. Contact can be prevented. Therefore, it is possible to prevent damage to the cover by painting or transfer applied to the shaft cylinder 18 or the protrusion 34a, and it can contribute to permanently protecting the appearance of the writing instrument.

In the embodiment described above, an example is shown in which the protrusion 34a is formed integrally with the knock cover 34 that is detachably attached to the knock bar 31, but the knock cover 34 and the knock bar 31 are also shown. May be configured as a knock operation section by one component, and the present invention can be similarly applied to such a knock operation section, and the same operational effects can be obtained.
Moreover, although embodiment described above has shown the example which applied this invention to the mechanical pencil which can pay out a writing core one by one by knock operation, the knock type writing instrument concerning this invention is other than the above-mentioned mechanical pencil In addition, it can be applied to other writing instruments in which a writing body is drawn out from the front end side of the shaft cylinder by a knocking operation, and similar effects can be obtained.

1 Lead shaft (shaft tube)
2 Cap 3 Core Case 5 Chuck 6 Fastener 7 Relay Pipe 8 Slider 13 Chuck Spring 14 Grip Member 17 Relay Pipe 18 Rear Shaft (Shaft Tube)
18c Notch groove 21 Rotation drive mechanism 31 Knock stick 32 Knock stick spring 34 Knock cover (knock operation part)
34a Protruding part 34b Connection neck part 34c Outer peripheral edge 34d Protruding body 34e Vent hole 35 Resin pile seal

Claims (7)

The knock operation part that protrudes from the rear end portion of the shaft cylinder and feeds out the writing body from the front end side of the shaft cylinder by a knock operation, and the knock operation section is formed as a single component, and protrudes from the side surface of the shaft cylinder to protrude from the side surface And a protrusion that is movable in the axial direction,
The protrusion is formed integrally with the knock operation part via a connecting neck so that the protrusion is positioned closer to the front end part in the axial direction than the rear end part of the knock operation part, and the protrusion The knocking type writing instrument is characterized in that the portion is thickened on both sides with the connecting neck portion at the center and a substantially uniform gap is formed between the cylindrical shaft tube . Width in the connecting neck between the projecting portion and the knocking operation part, the knocking operation part and is set rather smaller than the width of the protrusion, formed from the rear end of the barrel in a straight line toward the front The knock type writing instrument according to claim 1, wherein the connecting neck portion is arranged to be movable in the cut-out groove.   The connecting neck portion located in the notch groove formed on the shaft cylinder has protrusions that project toward the inner surfaces opposed to the notch groove at positions on both sides of the notch groove. 3. The knock type writing instrument according to claim 2, wherein each of the inner surfaces of the notch grooves is formed so that only a protrusion formed on the connection neck portion is in contact with the inner side surface of the notch groove.   4. The knock type writing instrument according to claim 3, wherein each of the protrusions formed on the connection neck part is formed to protrude in the axial direction. 5.   5. The knock cover that protrudes from a rear end portion of the shaft tube is a knock cover that is detachably attached to a knock bar that transmits a knock operation in an axial direction. The knock type writing instrument described in any one of the above. 6. The decorative member according to claim 1, wherein a decorative member separate from the protruding portion is attached to a concave portion formed in a center portion of the outward surface of the protruding portion. Knock-type writing instrument described in item 1. The knock-type writing instrument according to any one of claims 1 to 6, wherein the protrusion is formed in a disc shape in plan view.

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