JP4472964B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument that causes a writing unit to be raised and lowered by a sliding operation of a pusher provided on a shaft cylinder, and more particularly, to a retractable writing instrument that includes a clip with an opening / closing operation function.

Conventionally, this type of writing instrument has a plurality of color refills, a pusher connected to each of these refills and having a rear side protruding from the outer peripheral surface of the shaft tube, and a portion other than the presser on the peripheral surface of the shaft tube. It is equipped with a clip with attached opening / closing operation function, and the selected pusher is slid forward to be locked in the shaft cylinder so that the protruding state of the refill corresponding to the pusher is maintained. A multicolored ballpoint pen is known (for example, see Patent Document 1).
There is also known a writing instrument in which a clip is integrally provided on a specific pusher instead of the peripheral surface of the shaft cylinder (see, for example, Patent Document 2).
By the way, the above-mentioned clip with an opening / closing operation function has many advantages such as a large opening, a strong clamping force, and even a thick clamping object can be firmly clamped.

However, according to the invention disclosed in Patent Document 1, since the clip with an opening / closing operation function occupies a part of the space in the circumferential direction of the shaft tube, the pusher is added in the circumferential direction for the purpose of increasing the type of refill. It was difficult.
Further, according to the invention disclosed in Patent Document 2, when the object to be clamped is repeatedly sandwiched between the clip and the shaft tube, the engagement portion between the clip and the pusher or the relationship between the pusher and the shaft tube is obtained. A load is repeatedly applied to the joint and the like, and the engagement state is increased, and there is a possibility that the play may occur, come off, or further be destroyed.
2001-121882 gazette Japanese Utility Model Publication No. 4-17985

  The present invention has been made in view of the above-described conventional circumstances, and the problem is that the writing cylinder has a function of projecting and retracting from the shaft cylinder and a function of opening and closing the clip, and the shaft cylinder circumferential direction is provided. This space can be secured widely so that it can be used effectively, and the clip with the opening / closing operation function is prevented from being detached or damaged, and the quality of the clip with the opening / closing operation function is maintained for a long time. It is to provide a writing instrument that can.

In order to solve the above-mentioned problem, as a first invention, as one feature, a shaft tube and a pusher that is slidably engaged in the shaft tube in the axial direction and exposed from the outer peripheral surface of the shaft tube In a writing instrument that causes the writing part to protrude from the shaft tube when the pusher moves forward, and that the writing part is immersed in the shaft tube when the pusher moves backward, The clip body is integrally provided with the pusher to constitute a clip with an opening / closing operation function that can be opened / closed, and the clip with the opening / closing operation function has a front and rear portion with a fulcrum portion of the clip with the opening / closing operation function as a boundary. said to alternately approach to the barrel, while supporting the clip body relative to the push rod, as between the shaft tube and the clip body is narrowed at the front side than the fulcrum, that it is urging the clip body In addition, a mechanical pencil refill is connected to the clip with the opening / closing operation function, and the lead pencil is formed by knocking the opening / closing operation function clip at the forward position. Is engaged in the shaft cylinder, and when the pusher of the clip with the opening / closing operation function moves in the shaft cylinder centripetal direction at the advanced position, the opening / closing operation function is provided in the shaft cylinder. A locking portion for locking the clip so as not to move backward is provided, and the pusher of the clip with the opening / closing operation function is in sliding contact with the inner surface of the shaft cylinder when moving forward by the knocking operation. A restriction projection for restricting the movement of the pusher in the centrifugal direction is provided, or a guide wall for guiding the pusher of the clip with the opening / closing operation function in the axial direction of the axial cylinder is provided on the shaft cylinder. Is The guide wall protrudes from the outer peripheral surface of the shaft cylinder so as to be close to or in contact with both side surfaces of the presser in the opening / closing operation function clip, or the mechanical pencil refill is provided in the opening / closing operation function clip. And the mechanical pencil refill is engaged in the shaft cylinder so that the lead core is drawn out when the clip with the opening / closing operation function in the forward position is knocked. Is provided with a locking portion for locking the pusher of the clip with the opening / closing operation function so as not to move backward when the pusher of the clip with the opening / closing operation function moves in the shaft tube centripetal direction at the advance position. The pusher of the clip with the opening / closing operation function is provided with a regulation protrusion for regulating the movement of the pusher in the centrifugal direction by slidingly contacting the inner surface of the shaft cylinder during advancement by the knocking operation. Are each characterized by being.

  Here, the above-mentioned pusher may be singular or plural, but in particular, when the space in the axial direction of the shaft cylinder is effectively used, the above-mentioned clip with an opening / closing operation function includes a plurality of The clip main body is integrally provided in at least one of the pushers.

  In addition, specific means for supporting the clip body with respect to the pusher include an aspect in which the clip body is engaged with the pusher in an uneven shape and pivotally supported, or the clip body is pivoted with respect to the pusher And the like supported by a member.

As a preferred specific example for biasing the clip body, one end side of a substantially U-shaped pinching spring is locked to the pusher, and the other end side of the clip spring is fixed to the support portion of the clip body. An embodiment in which the gap between the front side of the clip main body and the pusher is narrowed by the urging force of the clip spring is provided.
Furthermore, as another specific example of urging the clip body, a tension spring is provided in front of the support portion between the clip body and the pusher, and the urging force of the tension spring causes the clip body to A mode in which the space between the front side and the pusher is narrower than the support part, or a compression spring is provided in front of the support part between the clip body and the pusher, and the compression spring is attached. A mode in which the space between the front side of the support portion of the clip body and the pusher is narrowed by force, the clip body and the pusher are connected by an elastic member, and the clip is made by the elastic force of the elastic member The aspect etc. which were made to narrow between the front side and the said presser rather than the said support part of a main body are mentioned.

  In the second invention, a plurality of the pressers are disposed in the circumferential direction of the shaft cylinder, and the clip with the opening / closing operation function is configured by at least one of the plurality of pressers. To do.

  Further, in the third invention, the clip with the opening / closing operation function is arranged such that the rear end portion of the pusher is rearward so as to restrict the movement in the shaft tube centripetal direction and the shaft tube centrifugal direction at the retracted position. It is characterized by engaging with the peripheral wall of the shaft tube in a concavo-convex shape.

  In the fourth invention, the shaft cylinder is provided with a guide wall that guides the pusher of the opening / closing operation function clip in the axial direction of the shaft cylinder, and the guide wall is provided in the clip with the opening / closing operation function. It protrudes from the outer peripheral surface of the shaft cylinder so as to be close to or in contact with both side surfaces of the presser.

  According to a fifth aspect of the present invention, when the clip with the opening / closing operation function moves forward from the retracted position in one or both of the clip body and the shaft tube, the clip body has a posterior portion behind the fulcrum portion. An opening restricting portion for restricting the opening operation of the clip main body is provided by bringing the side and the shaft tube into contact with each other.

  According to a sixth aspect of the present invention, when the clip with the opening / closing operation function moves forward from the retracted position in one or both of the clip body and the shaft tube, the clip body has a rearward portion than the fulcrum portion. An opening restricting portion for restricting the opening operation of the clip main body is provided by bringing the side and the shaft cylinder into contact with each other, and the opening restricting portion is constituted by a protruding end side of the guide wall.

  The seventh invention is characterized in that the front end side of the clip body and the outer peripheral surface of the shaft cylinder are engaged with each other in a concavo-convex shape so as to guide the clip body in the axial direction of the shaft cylinder.

  In the eighth invention, the clip with an opening / closing operation function is characterized in that the clip body and the presser are fitted in a concavo-convex shape in front of the fulcrum portion.

In the ninth invention, at least one of the shaft cylinder and the pusher when the pusher is locked at the advanced position, the side surface of the pusher and the shaft cylinder are provided. Is provided with a protrusion for bringing them close to or in contact with each other.
Here, “the pusher” may be the pusher constituting the clip with the opening / closing operation function, or may be the pusher not constituting the clip with the opening / closing operation function. Absent.

  The tenth invention is characterized in that the protrusion is provided on the shaft cylinder so as to be close to or in contact with a side surface of the pusher locked at the forward movement position.

  In the eleventh aspect of the invention, a mechanical pencil refill is connected to the opening / closing operation function clip, and the mechanical pencil refill is knocked by operating the opening / closing operation function clip in the forward position. The lead cylinder is engaged with the lead cylinder so that the opening / closing operation is performed when the pusher of the clip with an opening / closing operation function moves in the shaft cylinder centripetal direction at the advance position. A locking portion for locking the pusher of the function clip so as not to move backward is provided, and the pusher of the clip with the opening / closing operation function is slidably contacted with the inner surface of the shaft cylinder during advancement by the knocking operation. And the control protrusion which controls the movement to the centrifugal direction of this pusher is provided, It is characterized by the above-mentioned.

The writing instrument of the ninth invention and the writing instrument of the tenth invention may have independent structures as shown below.
That is, the writing instrument includes a shaft tube and a pusher that is slidably engaged in the shaft direction in the shaft tube and is exposed from the outer peripheral surface of the shaft tube, and is written when the pusher is advanced. In a writing instrument in which the portion is projected from the shaft tube and the writing portion is immersed in the shaft tube when the pusher is in the retracted position, either or both of the shaft tube and the presser Is characterized in that there is provided a protrusion for bringing the side surface of the pusher and the shaft tube close to or in contact with each other at least when the pusher is locked at the forward movement position.
As a more preferred writing instrument, in the writing instrument, the protrusion is provided on the shaft cylinder so as to be close to or in contact with a side surface of the pusher locked at the forward movement position. To do.

The present invention has the following effects by the above configuration.
According to the first invention, when the clip with the opening / closing operation function is set to the forward position, the writing portion protrudes from the shaft cylinder, and when the clip with the opening / closing operation function is set to the retracted position, the writing section is immersed in the shaft cylinder. .
Further, when the rear side of the fulcrum portion of the clip body is pressed toward the shaft tube against the urging by the urging member, the space between the clip body and the shaft tube is opened.
Therefore, it is possible to have both a function as a pusher for causing the writing unit to move in and out of the shaft cylinder and a function as a clip that can be opened and closed in one member.
As a result, it is possible to secure a wide space in the circumferential direction of the portion other than the clip with the opening / closing operation function in the shaft cylinder, and in this space, a pusher for making other types of refills appear or disappear is used for advertising or usage. It is also possible to provide a label for explanation.
Accordingly, the space in the circumferential direction of the shaft cylinder can be secured widely so that it can be used effectively, while having the function of moving the writing part in and out of the shaft cylinder and the function of opening and closing the clip.

  Furthermore, according to the second invention, the pusher that can be slid including the above-mentioned clip with the opening / closing operation function can be easily added in the circumferential direction of the shaft tube.

Further, according to the third invention, in the retracted position, rattling in the shaft tube centripetal direction and the shaft tube centrifugal direction in the clip with the opening / closing operation function is caused by the uneven engagement between the pusher and the shaft tube peripheral wall. Is prevented.
Therefore, even if the clip body is subjected to a load in the shaft centripetal direction or the shaft cylinder centrifugal direction due to an opening / closing operation on the clip body, it is possible to prevent the clip with the opening / closing operation function from being rattled. It is possible to prevent the clip with function from being detached or damaged, and to maintain the quality of the clip with an opening / closing function for a long period of time.

Further, according to the fourth invention, the sliding operation in the axial direction of the clip with the opening / closing operation function is maintained in a stable state by the sliding contact between the both side surfaces of the pusher and the guide wall.
Therefore, it is possible to prevent the clip with the opening / closing operation function from rattling in the circumferential direction due to the slide operation or the like with respect to the clip with the opening / closing operation function. As a result, the clip with the opening / closing operation function is detached or damaged. Can be reliably prevented, and the quality of the clip with the opening / closing operation function can be maintained for a longer period of time.

Furthermore, according to the fifth invention, when the rear end side of the clip body is pushed and moved in the axial direction when the clip with the opening / closing operation function moves forward from the retracted position, the rear side of the fulcrum portion in the clip body And the barrel come into contact with each other, so that the opening operation of the clip body is restricted.
Therefore, it is possible to prevent the clip body from being opened by the rear end side of the clip body being pushed in the axial direction while the clip with the opening / closing operation function is slid.
As a result, while the clip with the opening / closing operation function is slid, a load caused by the opening operation of the clip body is applied, and it is possible to prevent the clip with the opening / closing operation function from being detached or damaged, and with the opening / closing operation function. The quality of the clip can be maintained for a longer period.

Further, according to the sixth invention, the guide wall provided on the outer peripheral surface of the shaft tube prevents the rattling during the sliding of the opening / closing operation function clip, and the opening operation during the sliding of the opening / closing operation function clip. Therefore, it is not necessary to separately provide a configuration for bringing the moving clip main body rear end side into contact with the shaft tube.
Therefore, with a simple and highly productive structure, it is possible to more reliably prevent the clip with the opening / closing operation function from being detached or damaged, and to maintain the quality of the clip with the opening / closing operation function for a longer period of time. it can.

Furthermore, according to the seventh invention, when the clip with the opening / closing operation function slides, the front end side of the clip body is guided in the axial direction of the shaft cylinder while engaging the outer peripheral surface of the shaft cylinder in an uneven shape.
Therefore, during the sliding of the clip with the opening / closing operation function, the front end side of the clip body is prevented from rattling in a direction rotating around the fulcrum portion in a state substantially parallel to the shaft cylinder, and the clip with the opening / closing operation function The slide can be stabilized.
As a result, the clip with the opening / closing operation function can be more reliably prevented from being detached or damaged, and the quality of the clip with the opening / closing operation function can be maintained for a longer period of time.

Furthermore, according to the eighth invention, the fulcrum portion can be easily formed because the clip body and the pusher fit in a concavo-convex shape on the front side of the support part when the clip body is supported by the pusher. Positioned.
Moreover, after the assembly, the clip body and the presser fit in a concavo-convex shape on the front side of the fulcrum portion, so that the clip body can be prevented from rattling against the pusher.
Therefore, the clip with the opening / closing operation function can be more reliably prevented from being detached or damaged, and the quality of the clip with the opening / closing operation function can be maintained for a longer period of time.

Furthermore, according to the ninth aspect, when the pusher is locked at the forward movement position, the side surface of the pusher and the shaft cylinder are brought into proximity or contact by the protrusion.
Therefore, it is possible to prevent the locked state from being released due to the side of the pusher that is locked at the forward movement position being moved sideways.

Furthermore, according to the tenth invention, the side surface of the pusher comes close to or comes into contact with the protruding portion on the shaft tube side only when it is locked at the forward movement position.
Therefore, when the pusher moves rearward from the forward movement position, the pusher moves smoothly without being hindered by the sliding contact between the side surface of the pusher and the shaft tube. Can be made.

Further, according to the eleventh invention, when the clip with the opening / closing operation function is slid from the retracted position to the forward movement position, the clip with the opening / closing operation function moves in the shaft tube centripetal direction at the forward movement position, thereby The forward movement position in which the writing portion is protruded from the shaft cylinder is maintained by being locked in the shaft cylinder and in this locked state.
When the clip with the opening / closing operation function is knocked at this forward position, the lead pencil is extended by engaging the mechanical pencil refill into the shaft cylinder.
When the clip with the opening / closing operation function moves forward by this knocking operation, the pusher moves forward while releasing the engagement with the inside of the shaft tube, but by the sliding contact between the restricting projection of the pusher and the inner surface of the shaft tube. The movement of the pusher in the axial direction of the shaft cylinder is restricted. Therefore, the pusher is again locked in the shaft cylinder during the reverse operation during the knock operation, and the forward position is maintained even after the knock operation.
Therefore, during the knocking operation at the forward movement position, a force in the centrifugal direction is applied to the clip with the opening / closing operation function, and the locking state of the clip with the opening / closing operation function is released to prevent the backward movement position. As a result, usability and operability at the time of knocking can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The writing instrument A includes a shaft cylinder 10 that causes a writing part 21 for a mechanical pencil and a writing part 21 ′ for a ballpoint pen to protrude from the front end 11, and a plurality of pressers 30 disposed on the rear end side of the shaft cylinder 10. And a clip 40 with an opening / closing operation function, and the selected one pusher 30 or the clip 40 with an opening / closing operation function is moved between a forward position and a backward position by a sliding operation in the axial direction.

The advance position means that the pusher 30 or the clip 40 with an opening / closing operation function causes the writing unit 21 (or another writing unit 21 ′) to protrude from the distal end port 11 by the advance slide in the axial direction, and the shaft cylinder. 10 is locked in the inside.
The retracted position means that the pusher 30 or the clip 40 with an opening / closing operation function is brought into a stationary state with the writing part 21 (or another writing part 21 ′) immersed in the tip end 11 by the backward sliding in the axial direction. State.

The shaft cylinder 10 is formed by screwing a substantially cylindrical rear shaft 10b whose rear end is closed to a substantially cylindrical front shaft 10a having a front end opening 11 at a tapered front end portion. A plurality of guide holes 10b1 and 10b2 for guiding the pusher 30 and the opening / closing operation function clip 40 in the axial direction are formed in the rear end side peripheral wall (see FIGS. 1 to 5).
The guide hole 10b1 is a hole for engaging the clip 40 with the opening / closing operation function, and the guide hole 10b2 is a hole for engaging the pusher 30 other than the clip 40 with the opening / closing operation function. Each of the guide holes 10b1 and 10b2 is formed in a substantially long rectangular shape in plan view extending in the axial direction.

Further, on the inner peripheral surface side of the shaft cylinder 10 corresponding to each of the guide holes 10b1 and 10b2, the locking portion 12 for engaging the pusher 42 of the clip 40 with an opening / closing operation function or another pusher 30. Is formed.
When the pusher 42 or the pusher 30 sinks in the axial center of the shaft cylinder at the forward movement position, the latching part 12 has a shaft so that the rear end of the pusher 42 or the pusher 30 is latched. A stepped portion is formed on the inner peripheral surface of the tube 10.
And two this latching | locking parts 12 are arrange | positioned so that it may latch with respect to the both sides | surfaces side of the rear-end part of each pusher 42 or each pusher 30 for every pusher 42 or the pusher 30. ing.

  Further, a protrusion 15 is formed on the front side of each locking portion 12 so as to be close to or in contact with the side surface of the pusher 42 or the pusher 30 when locked to the locking portion 12. .

The protrusion 15 includes a flat surface portion 15a positioned so as to be close to or in contact with the side surface of the pusher 42 or the pusher 30 when locked to the locking portion 12, and the flat surface portion 15a from the inner surface of the rear shaft 10b. It comprises a guide surface 15b formed in an inclined shape toward the end edge (see FIG. 8).
According to this configuration, when the pusher 42 or the pusher 30 is in the forward movement position, the rear end portion is engaged with the both ends so that the pusher 42 or the pusher 30 is positioned between the protrusions 15 and 15 (see FIG. 7) on both sides. Locked to the portion 12.
More specifically, when the pusher 42 or the pusher 30 reaches the advanced position, the rear end portion thereof is guided between the guide surfaces 15b and 15b on both sides, so that the shaft 42 moves smoothly in the centripetal direction. To do. The pusher 42 or the pusher 30 has its side surfaces brought close to or in contact with the flat surface portions 15a, and the rear end portions are brought into contact with the locking portions 12 and 12 on both sides.

Further, guide walls 13 and 13 are disposed on the outer peripheral surface of the rear end side of the shaft tube 10 so as to sandwich the guide hole 10b1 (see FIG. 5).
Each guide wall 13 protrudes in the direction of the clip main body 41 from the outer peripheral surface of the shaft cylinder so as to be close to or in contact with the side surface of the pusher 42, and extends in the axial direction of the shaft cylinder along the guide hole 10b1. A substantially mountain-shaped opening restricting portion 13 a is formed on the protruding end side of the guide wall 13 on the rear side in FIG.

The opening restricting portion 13a is configured such that when the opening / closing operation function clip 40 slightly advances from the retracted position, the rear portion of the opening restricting portion 13a is brought into contact with or close to the back surface of the clip body 41 of the opening / closing operation function clip 40. The side part protrudes toward the clip body 41 side.
The opening restricting portion 13a prevents the clip main body 41 from being opened due to contact with the back surface of the clip main body 41 when the clip 40 with the opening / closing operation function advances from the retracted position. To prevent the clip body 41 from rattling.

Further, a guide convex portion 14 for guiding the clip body 41 in the axial direction of the axial cylinder is formed on the outer peripheral surface of the axial cylinder 10 in front of the pusher 42.
The guide convex portion 14 is a protrusion having a substantially mountain shape in a side view that is long in the axial direction, and engages with a later-described ball portion 41a of the clip body 41 to guide the ball portion 41a in the axial direction.

  The clip 40 with an opening / closing operation function includes a clip main body 41 that opens and closes between the shaft cylinder 10, a pusher 42 that supports the clip main body 41 at a fulcrum part a, and the clip main body 41 and the pusher 42 that are elastic. The urging member 43 is combined by force.

  The clip body 41 includes a ball portion 41a, a pivotal convex portion 41b, and a concave portion 41c on the front side of the pivotal convex portion 41b on the back surface on the front end side, and a rear end relative to the pivotal convex portion 41b. One end side of the urging member 43 is inserted through the side.

The ball portion 41a is formed by disposing two protruding portions 41a1 and 41a1 (see FIG. 6) having a substantially mountain shape when viewed from the side at a predetermined interval in the clip width direction, and between these protruding pieces 41a1 and 41a1. In addition, the guide projection 14 of the shaft tube 10 is configured to fit in and out freely.
Therefore, when the clip 40 with the opening / closing operation function slides back and forth, the movement of the clip body 41 in the axial tube axis direction is guided by the concave-convex engagement between the ball portion 41 a and the guide convex portion 14.

Further, the pivotal protrusion 41b has a semicircular cross-sectional shape extending in the clip width direction, and constitutes a fulcrum part a by fitting with a pusher 42 described later.
The pivotal support 41b can swing the clip body 41 in a seesaw-like manner. Specifically, the clip body 41 can alternately move the front and rear portions of the clip body 41 with the fulcrum a as a boundary. I have to.

  And the recessed part 41c is a site | part formed so that it might fit with the pusher 42 mentioned later, and while making assembly property of the clip 40 with an opening / closing operation function favorable, it prevents the clip main body 41 from rattling in use. is doing.

The pusher 42 has a substantially rod shape, and its front end portion is formed so that it can be fitted and connected to the mechanical pencil refill 20, and its rear end side is formed in a substantially mountain shape protruding from the shaft tube 10. Thus, a pivot recess 42a that fits with the pivot projection 41b of the clip main body 41 and a projection 42b that fits with the recess 41c are formed in the substantially mountain-shaped portion (see FIG. 2).
Of course, the concavo-convex relationship may be reversed with respect to the pivotal convex part 41b of the clip body 41 and the pivotal concave part 42a of the pusher 42, and the concave part 41c of the clip main body 41 and the convex part 42b of the pusher 42. It is.
The rear end of the pusher 42 has a protruding corner engaging / disengaging portion 42c that can be engaged with and disengaged from the engaging portion 12 in the shaft cylinder 10 and a concave portion below the engaging / disengaging portion 42c. 42e is formed.

The recess 42e is formed so as to engage with the peripheral wall of the shaft cylinder 10 when the clip 40 with the opening / closing operation function is in the retracted position, and to restrict the movement in the shaft cylinder centripetal direction and the shaft cylinder centrifugal direction. When the clip 40 with an operation function moves forward, it moves away from the peripheral wall.
Further, flanges 42f and 42f are projected from both side surfaces of the pusher 42. These flange portions 42f are engaged with the peripheral wall of the shaft tube 10 to prevent the pusher 42 from coming out of the guide hole 10b1 in the centrifugal direction while the clip 40 with the opening / closing operation function is slid.

Further, a restricting projection 42g that protrudes in the axial tube centrifugal direction is formed slightly in front of the convex portion 42b of the pusher 42.
The restricting projection 42g is formed so that the shaft tube 10 is slidably contacted with the inner peripheral surface of the shaft tube 10 when the clip 40 with the opening / closing operation function is further advanced by being knocked for lead lead out at the advanced position. The length in the axial cylinder axis direction is set to be slightly longer than the movement width in the axial cylinder axis direction of the clip 40 with the opening / closing operation function when projecting in the centrifugal direction and being knocked. Yes.

Further, the portion of the pusher 42 on the axial center side of the pusher 42 is located when the other pusher 30 moves forward in a locked state in which the engaging / disengaging portion 42c is locked to the locking portion 12. By being interfered by, the shaft is pushed in the centrifugal direction so that the locked state is released.
Similarly, the portion of the other pusher 30 on the axial center side is when the pusher 42 or the other pusher 30 moves forward while the pusher 30 is locked in the shaft tube 10. Further, the interference with the pusher 42 or the other pusher 30 is pushed in the centrifugal direction of the shaft cylinder so that the locked state is released.

The urging member 43 is formed by bending a plate-like elastic metal member into a substantially U shape or a substantially horseshoe shape, and both ends of the urging member 43 are repelled in the closing direction against a force in the opening direction.
The one end side of the urging member 43 has saw-toothed edges (not shown) so that it will not easily come out when inserted into the insertion hole 42d (see FIG. 2) of the pusher 42. Z).
Further, the other end side of the urging member 43 is formed in a bent shape having a substantially V-shaped longitudinal section so as to be hooked by the concave portion 41 d on the surface side of the clip main body 41.

Further, the mechanical pencil refill 20 includes a writing portion 21 at the front end portion thereof, and the rear end portion is fitted and connected to the front end portion of the pusher 42 in the clip 40 with an opening / closing operation function.
The mechanical pencil refill 20 slides the rear end side back and forth while the front end side is engaged with the inner edge of the front end 11 when the clip 40 with the opening / closing operation function is knocked at the forward movement position. By doing so, the lead core is drawn out from the writing unit 21.

In the figure, reference numeral 20 'denotes a plurality of ballpoint pen refills, and each ballpoint pen refill 20' includes a writing portion 21 '(ballpoint pen tip) for discharging ink by rolling the ball at its front end.
Reference numeral 51 in the drawing denotes a penetration support member that penetrates and supports the mechanical pencil refill 20 and a plurality of ballpoint pen refills 20 '.
Reference numeral 52 denotes a biasing member that is provided between the insertion support member 51 and the pusher 42 and biases the pusher 42 rearward. According to the illustrated example, a compression spring is used. It has been.
Reference numeral 53 in the figure is a biasing member that is provided between the penetration support member 51 and the pusher 30 and biases the pusher 30 rearward. A compression spring similar to the member 52 is used.
Reference numeral 54 in the drawing denotes an elastic gripping member that is attached to the front shaft 10a of the shaft tube 10 in an annular shape to improve the grip feeling of the writing instrument A.

Next, in the writing instrument A having the above configuration, a procedure for assembling the opening / closing operation function clip 40 to the shaft tube 10 will be described in detail (see FIG. 2).
First, the pusher 42 equipped with the mechanical pencil refill 20 and the urging member 52 is inserted into the rear shaft 10b in a state where the insertion support member 51 is not installed from the front side.
And the site | part which has the pivotal recessed part 42a and the convex part 42b in the pusher 42 protrudes in a centrifugal direction rather than the surrounding wall of the rear axis | shaft 10b via the guide hole 10b1, and the clip main body 41 fits in the protrusion part. It is done.
Specifically, the pivotal support 41b of the clip body 41 is fitted into the pivotal recess 42a of the pusher 42, and at the same time, the recess 41c of the clip body 41 and the convex 42b of the pusher 42 are fitted together. Therefore, the positioning of the fulcrum part “a” is easy and the backlash of the clip body 41 during the assembling work is small.

Then, the urging member 43 is attached to the clip body 41 and the pusher 42 fitted together. That is, one end side of the urging member 43 is inserted and fitted into the insertion hole 42d of the pusher 42, and the other end side of the urging member 43 is locked to the recess 41c on the surface side of the clip body 41.
At this time, since the concave portion 41c of the clip body 41 and the convex portion 42b of the pusher 42 are fitted together, the clip main body 41 is rattled or pushed by the pressing force from the rear side by the urging member 43. There is no possibility that the engagement between the pivotal convex portion 41b of the main body 41 and the pivotal concave portion 42a of the pusher 42 is disengaged, and the assemblability is good.
By attaching the urging member 43, the clip 40 with an opening / closing operation function that can be slid along the axial direction of the shaft tube 10 and that can be opened and closed is configured.

The above-described assembly procedure is a preferable example excellent in manufacturability, but the clip 40 with the opening / closing operation function can be assembled to the shaft tube 10 by the following procedure.
As another example of the assembly procedure, first, the pusher 42 is inserted into the interior of the guide shaft 10b1 of the rear shaft 10b. The dimension of the pusher 42 from the protruding end of one collar part 42f to the protruding end of the other collar part 42f is set slightly larger than the dimension in the clip width direction of the guide hole 10b1 of the rear shaft 10b. One or both of the child 42 and the guide hole 10b1 are slightly elastically deformed, so that the pusher 42 is smoothly inserted into the guide hole 10b1.
Then, the clip body 41 and the urging member 43 are assembled in the same manner as described above, and then the mechanical pencil refill 20 is attached to the front end side of the pusher 42.
Furthermore, as another example of the assembling procedure, the clip body 41, the pusher 42, and the urging member 43 are assembled outside the shaft tube 10 to form the opening / closing operation function clip 40, and the opening / closing operation function is provided. It is also possible to insert the pusher 42 of the clip 40 into the inside through the guide hole 10b1 of the rear shaft 10b in the same manner as in the above assembly procedure.

Next, the effect of the clip 40 with an opening / closing operation function is demonstrated in detail about the writing instrument A of the said embodiment.
If the rear side of the fulcrum part a of the clip body 41 is pressed toward the shaft tube 10 against the urging force of the urging member 43 at the retracted position of the clip 40 with the opening / closing operation function, the clip body 41 and the shaft The space between the tube 10 is opened.
When the clamping object x (see FIG. 6) is arranged between the clip body 41 and the shaft tube 10 in this open state and the pressing force is released, the clamping object x is biased by the biasing member 43. Is sandwiched between the ball portion 41a and the guide convex portion 14.
In this sandwiched state, the sandwiched object x is easily pulled out because the sandwiched object x is bent by being pushed by the guide protrusion 14 and slightly enters between the two projecting pieces 41a1 and 41a1 constituting the ball 41a. It is pinched so that it will not end up.
In addition, since the clip 40 with the opening / closing operation function fits the concave portion 42e of the pusher 42 to the peripheral wall of the rear shaft 10b during the opening / closing operation, rattling in the shaft cylinder centripetal direction and the shaft cylinder centrifugal direction is prevented. Furthermore, since both guide walls 13 are brought close to or in contact with both side surfaces of the pusher 42, rattling in the axial direction of the shaft cylinder is also prevented.
Moreover, since the concave portion 41c of the clip main body 41 is guided by the fitting with the convex portion 42b of the pusher 42 during the opening / closing operation of the clip main body 41, this guide effect also prevents the clip main body 41 from rattling. Is done.

Further, when the clip 40 with the opening / closing operation function is slightly advanced from the retracted position by a manual operation or the like, the rear portion of the clip body 41 with respect to the fulcrum portion a comes into contact with the opening restriction portion 13a of the guide wall 13. The opening operation of the clip main body 41 is restricted, and the rattling of the clip main body 41 due to the opening operation is prevented, and further, the restriction between the concave portion 41c of the clip main body 41 and the convex portion 42b of the pusher 42 is prevented. Since the fit is maintained, rattling of the clip body 41 is prevented by this fit.
When the clip 40 with the opening / closing operation function further advances, the clip main body 41 moves closer to or in contact with the projecting end surface (upper end surface in the drawing) of the guide wall 13 while moving forward. For this reason (see FIG. 3), rattling due to the opening operation is prevented even during the movement.
Furthermore, during the forward movement, the clip 40 with the opening / closing operation function brings the guide walls 13 close to or in contact with the fitting of the concave portion 41 c of the clip body 41 and the convex portion 42 b of the pusher 42 and both sides of the pusher 42. Therefore, backlash in the circumferential direction of the shaft cylinder is also prevented.

  When the clip 40 with the opening / closing operation function reaches the forward movement position, the pusher 42 slightly sinks in the shaft tube centripetal direction, and the engagement / disengagement part 42c of the pusher 42 becomes the locking part 12 in the rear shaft 10b. The forward movement position of the clip 40 with the opening / closing operation function is maintained by being locked to (a state shown by a solid line in FIG. 3).

At this time, since each side surface on the rear end side of the pusher 42 is in a position close to or in contact with the flat surface portion 15a of the protrusion 15, the pusher 42 does not move laterally so as to be laterally shaken.
Therefore, it is possible to prevent the locked state between the pusher 42 and the locking portion 12 from being released due to the lateral blurring of the pusher 42 due to some impact or the like.
In addition, this effect is show | played similarly about the presser 30 which does not comprise the clip 40 with an opening / closing operation function.

Furthermore, when the clip 40 with the opening / closing operation function is knocked for feeding the lead core, when the reciprocating operation is performed in the front-rear direction within the range ahead of the advance position, the restricting projection 42g of the pusher 42 is moved backward. By slidingly contacting the inner surface of the shaft 10b, the movement of the pusher 42 in the shaft tube centrifugal direction is prevented.
More specifically, when the pusher 42 moves further forward than the forward movement position, the pusher 42 separates the engaging / disengaging portion 42c from the locking portion 12 of the rear shaft 10b and moves the restricting protrusion 42g to the rear. The sliding contact is made in the shaft 10b. When the pusher 42 is retracted while returning to the forward movement position while maintaining the sliding contact state, the engaging / disengaging portion 42c is engaged with the engaging portion 12 again.
Therefore, even if the clip 40 with the opening / closing operation function receives a force in the axial cylinder centrifugal direction during the knocking operation, the locked state at the forward movement position is prevented from being released.
In order to release the locked state of the clip 40 with the opening / closing operation function at the forward position, the other pusher 30 is slid forward, and the pusher 30 is pushed by the pusher 42 of the clip 40 with the opening / closing operation function. What is necessary is just to make it interfere.

According to the above embodiment, the ball portion 41a of the clip main body 41 has a length substantially equal to the guide convex portion 14 as shown in FIGS. 1 to 5, but is similar to the clip main body 41 ′ shown in FIG. Moreover, it is good also as an aspect which formed ball part 41a 'longer than the guide convex part 14. FIG.
The clip body 41 ′ in this aspect is configured by replacing the ball part 41 a and the both projecting piece parts 41 a 1 and 41 a 1 in the clip body 41 described above with the ball part 41 a ′ and both the projecting piece parts 41 a 1 ′ and 41 a 1 ′. The length of the ball portion 41a ′ and the projecting piece portions 41a1 ′ and 41a1 ′ in the axial tube axis direction is set to be substantially equal to or longer than the slide range of the clip 40 with the opening / closing operation function. .
Therefore, according to this aspect, rattling during sliding of the clip 40 with the opening / closing operation function can be more effectively prevented in substantially the entire region of the sliding range.

Sectional drawing which abbreviate | omits and shows an example of the writing instrument concerning this invention. The principal part sectional drawing which shows the state which removed and disassembled the clip with an opening / closing operation function from the axial cylinder. The principal part sectional drawing which shows the state which made the clip with an opening / closing operation function into the advance position. The principal part sectional drawing which shows the state which has knocked the clip with an opening-and-closing operation function, in order to let out a lead core from the refill for mechanical pencils. The (V)-(V) line expanded sectional view in FIG. The principal part sectional drawing which shows the state which clamped the clamping object between the clip main body and the axial cylinder. The principal part top view which shows the rear-end side of a shaft cylinder. The principal part expansion perspective view which shows a latching | locking part and a protrusion. The perspective view which shows the state which looked at the other example of the clip main body from the back surface side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Shaft cylinder 12: Locking part 13: Guide wall 13a: Opening restriction part 14: Guide convex part 15: Protrusion part 20: Refill for mechanical pencil 21: Writing part 40: Clip with an opening / closing operation function 41: Clip main body 41a: Ball part 41a1: Projection piece part 41c: Concave part 42: Pusher 42b: Convex part 42e: Concave part 42g: Restriction protrusion a: A fulcrum part A: Writing instrument

Claims (10)

A shaft cylinder and a pusher that is slidably engaged in the axial direction in the shaft cylinder and exposed from an outer peripheral surface of the shaft cylinder, and the writing portion is moved away from the shaft cylinder when the pusher is advanced. In a writing instrument that protrudes and is adapted to immerse the writing part into the shaft tube when the pusher is retracted,
The clip body is integrally provided with the pusher, and constitutes a clip with an opening / closing function capable of opening / closing,
This clip with opening and closing function
As before and after site boundary fulcrum of the clip with the opening and closing function approaches alternately with respect to the barrel, while supporting the clip body relative to said push rod, said clip body and said barrel The clip body is biased so that the space between the fulcrum part is narrowed on the front side ,
The rear end portion of the presser integrally provided with the clip body is directed rearward so that the movement in the shaft tube centripetal direction and the shaft tube centrifugal direction is restricted when the retracted position is reached. A writing instrument characterized by being engaged in an uneven shape . A shaft cylinder and a pusher that is slidably engaged in the axial direction in the shaft cylinder and exposed from an outer peripheral surface of the shaft cylinder, and the writing portion is moved away from the shaft cylinder when the pusher is advanced. In a writing instrument that protrudes and is adapted to immerse the writing part into the shaft tube when the pusher is retracted,
The clip body is integrally provided with the pusher, and constitutes a clip with an opening / closing function capable of opening / closing,
This clip with opening and closing function
The clip body is supported with respect to the pusher so that the front and rear portions thereof alternately approach the shaft cylinder at the fulcrum portion of the clip with the opening / closing operation function, and the clip body and the shaft tube, The clip body is biased so that the space between the fulcrum part is narrowed on the front side,
The shaft cylinder is provided with a guide wall for guiding the pusher of the clip with the opening / closing operation function in the axial direction of the shaft cylinder, and the guide wall is adjacent to both side surfaces of the pusher in the clip with the opening / closing operation function. A writing instrument characterized by protruding from the outer peripheral surface of the shaft cylinder so as to come into contact . A shaft cylinder and a pusher that is slidably engaged in the axial direction in the shaft cylinder and exposed from an outer peripheral surface of the shaft cylinder, and the writing portion is moved away from the shaft cylinder when the pusher is advanced. In a writing instrument that protrudes and is adapted to immerse the writing part into the shaft tube when the pusher is retracted,
The clip body is integrally provided with the pusher, and constitutes a clip with an opening / closing function capable of opening / closing,
This clip with opening and closing function
The clip body is supported with respect to the pusher so that the front and rear portions thereof alternately approach the shaft cylinder at the fulcrum portion of the clip with the opening / closing operation function, and the clip body and the shaft tube, The clip body is biased so that the space between the fulcrum part is narrowed on the front side,
A mechanical pencil refill is connected to the clip with the opening / closing operation function,
The mechanical pencil refill is engaged in the shaft cylinder so that the lead core is drawn out by knocking the clip with the opening / closing operation function at the forward position,
In the shaft tube, when the pusher of the clip with the opening / closing operation function moves in the shaft tube centripetal direction at the advance position, the pusher of the clip with the opening / closing operation function is locked so as not to move backward. A stop is provided,
The pusher of the clip with the opening / closing operation function is provided with a regulation protrusion that regulates the movement of the pusher in the centrifugal direction by slidingly contacting the inner surface of the shaft cylinder when moving forward by the knocking operation. Writing instrument characterized by A plurality of the pressers are arranged in a circumferential direction of the shaft cylinder, and the clip with the opening / closing operation function is configured by at least one of the plurality of pressers. writing instrument according to any.   When the clip with the opening / closing operation function advances from the retracted position to one or both of the clip body and the shaft cylinder, the rear side of the clip body with respect to the fulcrum portion and the shaft cylinder are contacted. The writing instrument according to any one of claims 1 to 4, further comprising an opening restricting portion that is in contact with the clip body and restricts an opening operation of the clip body. When the clip with the opening / closing operation function is advanced from the retracted position to the shaft cylinder, the rear side of the fulcrum portion in the clip body and the shaft cylinder are brought into contact with each other to perform the opening operation of the clip body. Establish an opening restriction section to regulate,
The writing instrument according to claim 2 , wherein the opening restricting portion is configured on a protruding end side of the guide wall. A pair of ball portions are provided at the front end of the clip body, and a guide convex portion that can be engaged with the pair of ball portions is provided on the outer peripheral surface of the shaft cylinder,
By engaging the guide convex portion with the ball portion, the front end side of the clip body and the outer peripheral surface of the shaft cylinder are engaged in a concavo-convex shape so as to guide the clip body in the axial direction of the shaft cylinder. The writing instrument according to any one of claims 1 to 6.   8. The writing instrument according to claim 1, wherein the clip with the opening / closing operation function is configured such that the clip body and the presser are fitted in a concavo-convex shape in front of the fulcrum portion. 9. .   One or both of the shaft cylinder and the pusher has a protrusion that makes the side surface of the pusher and the shaft cylinder approach or come into contact with each other when at least the pusher is locked at the advanced position. The writing instrument according to claim 1, wherein the writing instrument is provided.   The writing tool according to claim 9, wherein the protrusion is provided on the shaft tube so as to be close to or in contact with a side surface of the pusher locked at the forward movement position.

Images