JP4704885B2 - Intrusive writing instrument - Google Patents

Description

  The present invention relates to a retractable writing instrument in which a writing portion such as a ballpoint pen tip or a mechanical pencil tip portion is caused to protrude from the tip of a shaft tube by an operation of moving a pusher integrated with a clip forward and backward.

Conventionally, this type of writing instrument includes a plurality of pressers (30, 42) and a plurality of writing units (21, 21) corresponding to the pressers as in the invention described in Patent Document 1, for example. There are multicolored haunting writing instruments.
According to this writing instrument, when the clip (40) integral with the pusher (42) is slid forward, the pusher (42) slid forward is sinked in the shaft centripetal direction, and the shaft cylinder peripheral wall is Locked by the locking portion (12), the protruding state of the writing portion (21) of the mechanical pencil refill (20) is maintained.
Further, when the locked state of the pusher (42) is released by the operation of another pusher (30), the pusher (42) and the clip (40) are moved by the biasing force of the biasing member (52). It slides back and the said writing part (21) will be in an immersive state.

However, according to the above prior art, as shown in FIGS. 6 (a) and 6 (b), after the writing portion of the mechanical pencil refill (20) is in a protruding state, the front end side of the clip (40) is in the axial centering direction. The rear end side of the clip (40) and the pusher (42) is lifted in the axial tube centrifugal direction with the ball part (41a) of the clip (40) as a fulcrum, and the pusher (42) is There is a case where the writing part of the mechanical pencil refill (20) is immersed due to detachment from the stop (12).
Therefore, even though the user's finger or the like touches the front end side of the clip (40) and the front end side of the clip (40) is pressed in the shaft tube direction, the user does not intend. There was a possibility that the writing part (21) would be immersive.
Japanese Patent Application Laid-Open No. 2005-1111876

  This invention is made | formed in view of the said conventional situation, The process made into the subject is providing the retractable writing instrument which can prevent the protrusion state of a writing part being cancelled | released unintentionally. is there.

  In order to solve the above-mentioned problem, the first invention is a pusher urged rearward by a urging member, and sinks in the centripetal direction of the shaft as it slides forward against the urging force. And a clip that is integrally supported by the pusher, a front side of a support point of the clip, and the clip and the circumferential surface of the cylinder. A ball portion disposed between the two, and the writing portion is maintained in a protruding state by locking the pusher to the locking portion, and the pusher is removed from the locking portion and slid backward. In the retractable writing instrument in which the writing part is immersed in, when the pusher is locked to the locking part on the front end side of the ball part in the clip, it contacts or approaches the outer peripheral surface of the shaft tube It is characterized by providing a projecting portion.

  Here, the ball part may be a protrusion that presses the object to be clamped when the object to be clamped such as paper or cloth is sandwiched between the clip and the outer peripheral surface of the shaft cylinder. Includes both the mode provided on the clip side and the mode provided on the shaft tube side.

  Moreover, in 2nd invention, the said protrusion has a part which shifted | deviated to the axial cylinder circumferential direction with respect to the virtual extension part at the time of extending the said ball | bowl part ahead.

  According to a third aspect of the present invention, the protrusion has portions located on both sides of the virtual extension portion in the axial tube circumferential direction.

  In the fourth aspect of the invention, the protrusion is formed substantially integrally from both side portions located on both sides in the axial tube circumferential direction of the virtual extension portion and a connecting portion connecting these both side portions. Features.

  The protrusion in the fourth aspect of the invention can be, for example, a substantially U-shaped cross section composed of the both side portions and the connecting portion, a substantially concave section, a substantially H-shaped section, or the like.

  Further, the fifth invention is characterized in that the protruding end surface of the protruding portion is formed in a substantially flat shape.

  In the sixth invention, when the clip is slid rearward, a gap is formed between the protrusion and the outer peripheral surface of the shaft cylinder so as to face the protrusion in the shaft cylinder. The position to perform is partially dented in the shaft tube centripetal direction.

Since the present invention is configured as described above, the following effects can be obtained.
According to the first invention, if the clip portion and the pusher are slid forward, and the pusher is locked to the locking portion of the shaft cylinder peripheral wall, the writing portion is maintained in the protruding state by the locking. The
In the protruding state of the writing part, even if the tip end side of the clip is pressed in the shaft tube centripetal direction, the protrusion on the tip end side of the clip contacts the outer peripheral surface of the shaft tube. It is possible to prevent the pusher from being released from being locked by being lifted in the direction of centrifugal movement of the shaft as a fulcrum.
Therefore, it is possible to prevent the protruding state of the writing part from being unintentionally released when the user's finger touches the tip end side of the clip.
Moreover, when the object to be clamped is sandwiched between the clip and the outer peripheral surface of the shaft cylinder, the object to be clamped is pressed at at least two locations of the ball portion and the protrusion in the axial direction of the shaft cylinder. The object to be clamped can be securely clamped so as not to easily come off.

  Moreover, according to the second invention, when the object to be sandwiched is sandwiched between the clip and the outer peripheral surface of the shaft cylinder, the object to be sandwiched is between the ball part and the protrusion in the axial direction of the shaft cylinder. Since it is pressed at at least two locations and further pressed at least two locations of the ball portion and the protrusion in the axial direction of the cylinder, the object to be clamped can be clamped more securely.

  Furthermore, according to the third invention, when the object to be clamped is sandwiched between the clip and the outer peripheral surface of the shaft tube, the object to be clamped is pressed by two portions constituting the protrusion, and Since the two portions are arranged wider than the ball portion, the object to be clamped can be clamped more securely.

  Furthermore, according to the fourth invention, when the object to be sandwiched is sandwiched between the clip and the outer peripheral surface of the shaft tube, the object to be sandwiched is also pressed by the connecting portion. Can be pinched.

  Furthermore, according to the fifth invention, since the contact area when the protruding end of the protrusion contacts the object to be clamped can be secured relatively large, the sandwiched object is easily held by the frictional resistance. It can be prevented from coming off.

Further, according to the sixth invention, when the clip is in the retracted position, a gap is formed between the protrusion at the tip of the clip and the outer peripheral surface of the shaft cylinder, and when the clip is in the advanced position, The protrusion at the tip of the clip comes into contact with or close to the outer peripheral surface of the shaft tube.
Therefore, when the clip is in the forward position, the locking state of the pusher integral with the clip can be reliably maintained, and when the clip is in the retracted position, the clip and the outer periphery of the shaft cylinder are Insertion of the object to be sandwiched between the surfaces can be facilitated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The retractable writing instrument A is accompanied by a forward slide that resists the urging force of the urging member 61 and the shaft cylinder 10 that causes the writing part 21 for ballpoint pens and the writing part 21 ′ for mechanical pencils to protrude from the tip part. A plurality of pushers 30 and 40 that sink in the centripetal direction of the shaft cylinder and are locked to the locking portion 12 of the peripheral wall of the shaft cylinder, and a clip 50 that is integrally supported by one of the pressers 40 And.
And this retractable writing instrument A maintains each writing part 21 (or 21 ') in the protrusion state by latching each presser 30 (or 40) to the said latching | locking part 12, and the same presser 30 (Or 40) is removed from the locking portion 12 and slid rearward so that the writing portion 21 (or 21 ') is immersed.

The shaft tube 10 is a well-known member having a substantially long tube shape penetrating in the axial direction and having a tip end formed in a tapered shape.
The shaft tube 10 may be formed of a single member or may be formed by connecting a plurality of members in the axial direction. Moreover, the taper-shaped part (not shown) of the front end side may be formed from a separate member as a tip part.
A plurality of guide holes 11 extending in the axial direction of the shaft cylinder are formed through the peripheral wall on the rear end side of the shaft cylinder 10 so as to expose a plurality of pushers 30 to be described later.

A plurality of locking portions 12 for locking each pusher 30 (or 40) when sliding forward are formed on the inner peripheral surface of the shaft tube 10.
According to the illustrated example, the locking portion 12 is formed so that the substantially rear half portion of the guide hole 11 is narrow at the inner side (shaft cylinder axis side) portion, thereby the front end of the narrow portion. It is the site | part formed in the substantially step shape.
And this latching | locking part 12 latches the rear-end side part of each pusher 30 at the substantially intermediate position of the length direction of each guide hole 11 at the time of sliding ahead and sinking in the shaft cylinder centripetal direction. To do.

Further, an auxiliary ball portion 13 projects from the outer peripheral surface of the shaft tube 10 so as to face the ball portion 51 of the clip 50 when retracted.
The auxiliary ball portion 13 is a single plate-like protrusion extending in the axial direction of the shaft, and is formed in a substantially mountain shape in a side view according to the preferred example shown in the figure.
The auxiliary ball portion 13 is engaged with a ball portion 51 of the clip 50 which will be described later so that the auxiliary ball portion 13 receives the ball portion 51 when a force in the circumferential direction of the axial cylinder acts on the front end side of the clip 50. The clip 50 is prevented from being damaged, and further, when the clip 50 moves forward and backward, functions as a guide member for guiding the clip 50 moving forward and backward.
Further, the auxiliary ball portion 13 has a ball portion 51 of the clip 50 and a protrusion to be described later when the object x (see FIGS. 4 and 5) is sandwiched between the clip 50 and the outer peripheral surface of the shaft tube 10. In cooperation with the part 52, the object to be clamped x is securely clamped so as not to easily come off.

  Further, when the clip 50 is in the retracted position (position shown in FIG. 1A) on the front end side of the auxiliary ball portion 13 on the outer peripheral surface of the shaft cylinder 10, the protrusion 52 and the outer periphery of the shaft cylinder 10 are located at the front end of the clip 50. The flat surface 14 is partially formed at a position facing the protrusion 52 in the shaft tube 10 so that a slight gap s is formed between the surface and the surface. It is made to dent in the shaft tube centripetal direction rather than the part.

The gap s is for facilitating insertion of the object x between the clip 50 and the outer peripheral surface of the shaft tube 10 when the clip 50 is in the retracted position (position shown in FIG. 1A). Yes, the dimensions are appropriately set in consideration of the assumed thickness of the object to be sandwiched x.
If this gap s is described in more detail, in the prior art shown in FIG. 6, for example, a sandwiched object such as paper or clothing is easily inserted between the clip (40) and the outer peripheral surface of the shaft cylinder. By disposing the ball part (41a) behind the tip part of the clip (40), a gap (s') is secured between the tip of the clip (40) and the outer peripheral surface of the shaft tube.
However, in the retractable writing instrument A of the present embodiment, the protrusion 52 at the tip of the clip 50 when in the forward position needs to be in contact with or close to the outer peripheral surface of the shaft tube 10, so that the flatness is formed on the outer periphery of the shaft tube 10. When the surface 14 is provided and the clip 50 is in the retracted position (the position of FIG. 1A), a gap s is secured between the protrusion 52 and the flat surface 14, and the clip 50 is in the advanced position (see FIG. 1 (b), the protrusion 52 is brought into substantially contact with the outer peripheral surface of the shaft tube 10.

In addition to the effect of securing the gap s as described above, the flat surface 14 has an increased contact area with the object to be sandwiched x when being sandwiched, and the object to be sandwiched x is caused by the frictional resistance. There is also an effect of preventing it from coming off easily.
A concave curved surface 15 having a substantially R-shaped cross section is formed on the front end side of the flat surface 14, and the concave curved surface 15 forms the flat surface 14 and the outer peripheral surface of the shaft cylinder 10 on the front side of the flat surface 14. And is smoothly continuous.
The lengths of the flat surface 14 and the concave curved surface 15 are such that when the clip 50 moves forward, the protrusion 52 at the front end of the clip 50 rides on the outer peripheral surface of the shaft cylinder 10 on the front side of the concave curved surface 15. It is set as appropriate.

The pusher 30 is a pusher for operating the writing unit 21 for ballpoint pens to advance and retreat.
The pusher 30 has, at its front end, a front end fitting portion 31 that fits to the rear end of the ballpoint pen refill 20, and the rear end thereof protrudes from the guide hole 11 of the shaft tube 10 to the outside. The operation protrusion 32 is provided.
Further, the pusher 30 has a locking projection 33 at the rearmost end thereof for locking with the locking portion 12 of the shaft tube 10.
When the other pusher 30 (or 40) moves forward in a locked state in which the locking protrusion 33 is locked to the locking portion 12, the portion on the axial center side of the pusher 30 moves forward. By being interfered by the pushed pusher 30 (or 40), the pusher 30 is pushed in the centrifugal direction of the shaft cylinder so that the locked state is released.

The pusher 40 is a pusher for advancing / retracting the writing part 21 ′ for a mechanical pencil or performing a knocking operation for feeding a lead core from the writing part 21.
The pusher 40 has, at its front end, a front end fitting portion 41 that fits to the rear end of the mechanical pencil refill 20 ′, and at the rear end thereof from the guide hole 11 of the shaft tube 10 to the outside. It has a connection part 42 that protrudes and connects the clip 50.
Further, the pusher 40 has a locking projection 43 at the rearmost end thereof for locking with the locking portion 12 of the shaft tube 10.
The pusher 40 is provided so as to slide further forward for lead lead feeding operation in a state where the locking projection 43 is locked to the locking portion 12.
A portion of the pusher 40 on the axial center side of the pusher 40 is moved forward when another pusher 30 moves forward in a locked state in which the locking protrusion 33 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.

And each of the pushers 30 and 40 of the said structure is urged | biased by the urging | biasing member 61 from the front side.
The urging member 61 is a coil-shaped compression spring according to the illustrated example. The front end surface of the urging member 61 abuts against the penetrating support member 62 and the pusher 30 (or 40) is urged rearward by the rear end surface. ing.
The insertion support member 62 is a member that slidably inserts the refills 20 and 20 ′, and is fitted and fixed to the inner peripheral surface of the shaft tube 10.
In addition, according to the illustrated example, each pusher 30 (or 40) is configured to be ejected rearward by the biasing member 61, but the biasing member 61 is provided on the rear side of each pusher 30 (or 40). It is also possible to adopt a structure in which each pusher 30 (or 40) is pulled by the biasing member 61.

The refill 20 is a well-known ballpoint pen refill in which a ballpoint pen tip serving as a writing unit 21 is fitted to the tip of a long ink containing tube containing ink.
The refill 20 ′ is a well-known mechanical pencil refill having a lead lead feeding mechanism and a lead lead delivery tube as a writing portion 21 ′ at the end of a long lead lead receiving tube.

A clip 50 is integrally attached to the connecting portion 42 of the pusher 40 having the above-described configuration via a leaf spring 44 having a substantially U-shaped cross section.
One end of the leaf spring 44 is fitted into the connecting portion 42 of the pusher 40, the other end is passed through the rear end of the clip 50, and the rear end of the clip 50 is connected to the locking projection 43 side. Is elastically pressed.
Then, the clip 50 is pressed in a concave-convex shape with respect to the locking projection 43 so that the rear end side is pressed toward the center of the shaft tube 10 to swing the front end side away from the shaft tube 10. It is supported together.

  The configuration of the front end side of the clip 50 will be described in detail. On the back surface of the front end side of the clip 50, a ball portion 51 is provided at a position facing the auxiliary ball portion 13 on the axial tube 10 side in the retracted position of the clip 50. Further, a protrusion 52 is provided on the back surface of the most distal end portion of the clip 50.

  The ball portion 51 is formed by arranging two angled plate-like bent portions 51a protruding toward the shaft tube 10 substantially in parallel with a predetermined interval in the shaft tube circumferential direction (see FIG. 2). The auxiliary ball portion 13 of the shaft tube 10 is inserted between the bent portions 51a and 51a.

Further, the protrusion 52 protrudes in the shaft tube centripetal direction so as to come into contact with the outer peripheral surface of the shaft tube 10 when the pusher 40 is locked to the locking portion 12.
If this protrusion 52 describes the shape in detail, with respect to virtual extension part 51a ', 51a' formed when both protrusions 51a and 51a of the ball | bowl part 51 are extended ahead, its axial cylinder periphery The two side portions 52a and 52a positioned on both sides in the direction and the connecting portions 52b that connect the both side portions 52a and 52a on the front end side thereof are substantially integrally formed. It is formed in a U shape (see FIG. 1).
Then, the projecting end surface a of the projecting portion 52 composed of the both side portions 52a and the connecting portion 52b, that is, the surface facing the outer peripheral surface of the shaft tube 10 is formed in a substantially flat shape so as to increase the contact area with the object x. Has been.

Next, the effect of the retractable writing instrument A having the above configuration will be described in detail.
When the clip 50 is slid forward against the urging force of the urging member 61, the pusher 40 integral with the clip 50 sinks in the shaft tube centripetal direction, and the locking protrusion 43 at the rear end of the pusher 40. Is locked to the locking portion 12 of the peripheral wall of the shaft tube 10, the protruding end of the protruding portion 52 at the front end of the clip 50 contacts the outer peripheral surface of the shaft tube 10, and the protruding state of the writing portion 21 ′ is maintained (FIG. 1 (b). )reference).
In this state, for example, even if a user's finger or the like touches the distal end side of the clip 50 and the distal end side of the clip 50 is pressed in the shaft tube centripetal direction, the protrusion 52 on the back surface of the clip 50 contacts the outer peripheral surface of the shaft tube 10. Because of the contact, the rear end side of the clip 50 and the pusher 40 is lifted in the shaft tube centrifugal direction with the contact point between the ball portion 51 and the outer peripheral surface of the shaft tube 10 as a fulcrum, and the locking projection 43 of the pusher 40 is It can prevent coming off from the latching | locking part 12. FIG.

  Further, when the protruding state of the writing portion 21 ′ is released, the pusher 30 other than the pusher 40 integral with the clip 50 may be slid forward. When the other pusher 30 is slid forward, the pushed pusher 30 interferes with the pusher 40 and the pusher 40 moves in the axial tube centrifugal direction, so that the locking projection 43 at the rear end of the pusher 40 is engaged. The clip 50 and the pusher 40 are urged by the urging member 61 and retracted, and the writing part 21 ′ is immersed inside the tip of the shaft tube 10.

Next, the operation and effect when the object to be clamped x is sandwiched between the clip 50 and the shaft tube 10 when the clip 50 is in the retracted position (the state shown in FIG. 1A) will be described.
When the object to be clamped x is clamped between the clip 50 and the outer peripheral surface of the shaft tube 10, the rear end side of the clip 50 is pressed in the shaft tube centripetal direction with a finger or the like, and the front end side of the clip 50 and the shaft tube 10, and the object x may be sandwiched between the two, or the object x may be held in the gap s between the protrusion 52 at the front end of the clip 50 and the outer peripheral surface of the shaft tube 10. It may be inserted between the ball portion 51 and the auxiliary ball portion 13 so as to push in the object to be sandwiched x.

  When the object to be clamped x is inserted and clamped between the clip 50 and the shaft cylinder 10, the object to be clamped x is pressed at two locations of the ball part 51 and the projecting part 52 in the shaft cylinder axis direction. (See FIG. 4).

Further, the sandwiched object x is pressed at the location of the ball portion 51 by the two bent portions 51a and 51a constituting the ball portion 51 and also by the auxiliary ball portion 13 from the opposite side. Will be.
Further, in the sandwiched object x, at the location of the projection 52, the two portions extending in the axial tube circumferential direction are pressed by the side portions 52a and 52a constituting the projection 52 (see FIG. 5). Furthermore, it is pressed also by the connection part 52b.

  In other words, the sandwiched object x is moved in the axial tube axial direction and the axial tube circumferential direction by a plurality of protrusions such as the ball portion 51, the auxiliary ball portion 13, both side portions 52 a and 52 a of the protruding portion 52, and the connecting portion 52 b. Furthermore, since it is pressed at a plurality of locations and, in addition, comes into relatively wide contact with the substantially flat protruding end surface a of the protruding portion 52, it is not easily pulled out.

  In addition, according to the said embodiment, although it was set as the preferable aspect provided with the ball part 51 by the side of the clip 50, and the auxiliary ball part 13 by the side of the axial cylinder 10 as a ball part, any one ball part is omitted. It is also possible to have a configuration.

It is sectional drawing which shows an example of the retractable writing instrument concerning this invention, (a) shows the state which made the writing part protrude, (b) shows the state which made the writing part immerse. It is the perspective view which looked at the principal part of the clip from the back side. It is the top view which looked at the principal part of the clip from the back side. It is a principal part side view which shows the state which pinched | interposed the to-be-clamped object between the clip and the axial cylinder. It is the (IV)-(IV) sectional view taken on the line in FIG. It is sectional drawing which shows an example of the conventional retractable writing instrument, (a) shows the state which made the writing part protrude, (b) shows the state which made the writing part immerse.

Explanation of symbols

10: Shaft cylinder 12: Locking part 21, 21 ': Writing part 30, 40: Pusher 50: Clip 51: Ball part 51a': Virtual extension part 52: Projection part 52a: Both side parts 52b: Connection part 61: With Force member A: Intrusive writing instrument

Claims (6)

The pusher is urged rearward by the urging member, and sinks in the centripetal direction of the shaft cylinder as it slides forward against the urging force and is locked to the locking portion of the peripheral wall of the shaft cylinder. A presser, a clip that is integrally supported by the presser, and a ball portion that is disposed on the front side of the support point of the clip and between the clip and the circumferential surface of the shaft, In the retractable writing instrument in which the writing part is maintained in a protruding state by locking the pusher to the locking part, and the writing part is immersed by sliding the pusher backward from the locking part. ,
A retractable writing instrument characterized in that a protrusion is provided on the front end side of the clip in the clip so as to contact or approach the outer peripheral surface of the shaft cylinder when the pusher is locked to the locking portion. .   2. The retractable writing instrument according to claim 1, wherein the protrusion has a portion that is shifted in a circumferential direction with respect to a virtual extension when the ball is extended forward.   The retractable writing instrument according to claim 2, wherein the protrusion has portions located on both sides of the axial extension of the virtual extension.   The said protrusion is substantially integrally formed from the both sides located in the axial cylinder circumferential direction both sides of the said virtual extension part, and the connection part which connects these both sides. A haunting writing instrument.   5. The retractable writing instrument according to any one of claims 1 to 4, wherein a protruding end surface of the protruding portion is formed in a substantially flat shape.   When the clip is slid rearward, the position of the shaft cylinder facing the protrusion is partially set so that a gap is formed between the protrusion and the outer peripheral surface of the shaft cylinder. 6. The retractable writing instrument according to any one of claims 1 to 5, wherein the writing instrument is recessed in a centripetal direction.

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