JP2011051184A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which a rear end periphery of a middle shaft is deformed as if cored, making the engaging part of a connecting member unable to engage with the rear end periphery of the middle shaft when a writing body unit is projected and in which, as a result, the projected state of the writing body unit can not be maintained. <P>SOLUTION: In a retractable writing utensil, a writing body unit is arranged in a retractable manner inside a barrel, with the outer periphery of the writing body unit surrounded with the middle shaft. Also, a clip is arranged on the barrel, with a ball section installed in the front of the clip, and with the ball section locked in the middle shaft of the writing body unit. Thus, the projected state of the writing body unit from the barrel is maintained in the retractable writing utensil. In the process of releasing the maintenance of the projected state, the ball section of the clip is continuously brought into contact with the engaging part of the middle shaft, with the locking part installed inside the barrel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is arranged such that a cursive unit can be projected and retracted inside a shaft cylinder, surrounds the center shaft on the outer periphery of the cursive unit, and a clip is disposed on the shaft cylinder, at the front portion of the clip. The present invention relates to a retractable writing instrument in which a ball portion is provided and the ball portion is locked to the center shaft of the writing unit, thereby maintaining the protruding state of the writing unit from the shaft tube.

As an example, a cursive unit surrounded by a central shaft is disposed in the shaft cylinder so as to be capable of appearing and retracting, and when the cursive unit protrudes, it is fixed in the vicinity of a ball portion formed in front of the clip. A retractable writing instrument is known in which a protruding state of the writing unit is maintained by locking a front end engaging portion of a member to a rear end peripheral portion of the central shaft. When the cursive unit is immersed in the shaft tube, the engaging portion of the connecting member fixed in the vicinity of the ball portion of the clip is separated from the shaft tube, so that the engaging portion of the connecting member and the writing member are written. The engagement with the body unit is released, and the writing unit is retracted into the shaft cylinder by the urging force of the elastic member.
JP 2003-220795 A

However, in the above-described conventional technology, in the protruding state of the writing unit, the peripheral edge of the rear end of the central axis of the writing unit is always the engagement portion of the connecting member by the biasing force of the elastic member. It is in contact with the tip surface and biased. This urging force is due to the elastic force of the elastic member, and the peripheral edge of the rear end of the center axis of the cursive unit is gradually deformed by the urging force. In particular, when the cursive body is dropped in the protruding state, the impact is applied and the deformation becomes remarkable. If the central axis of the cursive unit is made of a metal material, the deformation is small, but in recent years, it is common to use a resin molded product from the viewpoint of cost reduction, and the deformation is notable. It has become.
In addition to the deforming action of the center shaft and the deforming action at the time of dropping when the cursive unit protrudes, the leading end of the connecting member (engaging portion) is applied while the energizing force is applied when the cursive unit is immersed. ) Slides around the peripheral edge of the rear end of the middle shaft. Due to this sliding action, the deformation of the peripheral edge of the rear end of the central shaft is further promoted. In the end, the rear end peripheral portion of the middle shaft is deformed as if squeezed, and when the writing unit is protruded, the engaging portion of the connecting member is not engaged with the rear end peripheral portion of the middle shaft. As a result, the protruding state of the cursive unit was not maintained.

  The present invention is arranged such that a cursive unit can be projected and retracted inside a shaft cylinder, surrounds the center shaft on the outer periphery of the cursive unit, and a clip is disposed on the shaft cylinder, at the front portion of the clip. It is a retractable writing instrument that maintains the protruding state from the shaft cylinder of the writing unit by providing the ball part and locking the ball unit to the center shaft of the writing unit, and maintaining the protruding state In the process of releasing, the ball portion of the clip is continuously brought into contact with the engaging portion of the middle shaft, and the engaging portion is provided in the shaft tube.

  The present invention is arranged such that a cursive unit can be projected and retracted inside a shaft cylinder, surrounds the center shaft on the outer periphery of the cursive unit, and a clip is disposed on the shaft cylinder, at the front portion of the clip. It is a retractable writing instrument that maintains a protruding state from the shaft cylinder of the writing unit by providing a ball unit and locking the ball unit to the center shaft of the writing unit, and maintaining the protruding state In the process of releasing, the ball part of the clip is continuously brought into contact with the engaging part of the middle shaft, and the engaging part is provided in the shaft tube, so that the protruding and protruding operation can be obtained over a long period of time. An expression writing instrument can be provided.

The longitudinal half sectional view showing the 1st example. A portion enlarged view of FIG. FIG. 3 is a sectional view taken along line BB in FIG. Enlarged external perspective view of the clip. Front view of the clip. Side view of the clip. Perspective view of FIG. C part enlarged view of FIG. Enlarged view showing the release process. The DD sectional view taken on the line of FIG. Perspective view of FIG. The external appearance perspective view which shows a center axis | shaft. The principal part enlarged view which shows a 2nd example. Enlarged view showing the release process. The principal part enlarged view which shows a 3rd example. Enlarged view showing the release process. The principal part enlarged view which shows a 4th example. The principal part enlarged view which shows a 5th example. The left direction external appearance perspective view of the clip which shows the 6th example. The right direction external appearance perspective view of FIG.

  The operation will be described. When the cursive unit is protruding, the flat part of the central axis of the cursive unit and the flat part of the ball part, or the flat part of the central axis and the corner part of the ball part, or the curved part are in contact. In the release operation process in the immersion operation of the body unit, the corner portion of the ball portion or the curved portion continuously contacts and moves on the plane portion of the central axis of the cursive unit.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As a first example, a connection structure between a clip and a shaft tube in a writing instrument will be described. The shaft cylinder 1 includes a front shaft 2 and a rear shaft 3, and the front shaft 2 and the rear shaft 3 are detachably fixed by screwing. Further, a grip member 4 made of a rubber-like elastic body is inserted on the surface of the front shaft 2, and a protrusion 5 having an elliptical cross section is formed on the surface of the grip member 4. An outer cylinder 6 made of a metal material is inserted on the surface of the grip member 4, and a plurality of through holes 7 are formed in the outer cylinder 6. The protrusion 5 of the member 4 is exposed. Further, the surface of the outer cylinder 6 is finely knurled, and an anti-slip effect is generated by the knurled portion and the protrusion 5 of the grip member 4.
Reference numeral 8 denotes a tip member that is detachably attached to the tip of the front shaft 1, and the tip of the tip member 8 is a tip opening 9 in which a later-described cursive unit appears and disappears.

A substantially rectangular front window hole 10 and a rear window hole 11 having a contracted portion at a substantially central part are formed on the side surface of the rear part of the rear shaft 3. A connecting member 13 for connecting the clip 12 made of a metal material and the rear shaft 3 is inserted into the rear window hole 11. The connecting member 13 is formed by bending a plate-like member made of a metal material.
The clip 12 has a curved shape in which a rear portion approaches the direction of the shaft tube 1, and the curved portion makes the finger feel good, and the rear portion of the clip 12 is disposed on the shaft tube. By approaching 1, the sense of unity between the clip 12 and the shaft tube 1 is improved. The surface of the curved portion of the rear portion of the clip 12 is provided with a convex pattern having a low height by rolling or the like to improve the aesthetics, and slip when operating the curved portion. It also has a stopping effect.
Further, on both sides of the front portion of the clip 12, a semicircular arc-shaped ball portion 14 that protrudes in the direction of the shaft tube 1 is formed, but the front end portion of the ball portion 14 is a cut-out planar shape. The front end surface portion 14a is in surface contact with the rear end surface of the center shaft described later. Moreover, the space part 14b is formed between those ball parts 14 by forming the ball parts 14 on both sides of a clip. By positioning a part of a core tank, which will be described later, in the space portion 14b, more ball portions 14 of the clip 12 are to be brought into contact with the central shaft. Further, since the ball portion 14 can be penetrated in the inner diameter direction of the shaft tube 1, the exposure of the clip 12 to the surface of the shaft tube 1 can be reduced. It can be buried in. Thus, it is possible to prevent the base of the finger from coming into contact with the clip 12 during use, and the writing operation can be performed without a sense of incongruity. Further, the ball portions 14 are slightly approaching each other in the direction of the shaft tube 1. That is, by making the opposing ball portions 14 into a reverse “C” shape, it is easy to enter the front window hole 10 formed in the rear shaft 3. That is, even if the axis of the clip 12 is slightly distorted with respect to the axis of the barrel 1, the ball portion 14 is tapered (reverse “C” shape), and therefore is easily guided to the front window hole 10. (See FIGS. 3 and 5).
On the other hand, ridges 15 are formed on both sides of the intermediate rear portion of the clip 12 so as to bulge in the direction of the shaft tube 1, and through holes 16 are formed in the ridges 15.
The connecting member 13 that connects the clip 12 and the shaft tube 1 is mounted between the raised portions 15 formed at the opposing positions. The connecting member 13 has a box shape and is formed by bending a plate-like member into a quadrangle.

  A through hole 17 is formed in a substantially central portion of the side surface of the connecting member 13, and a support shaft 18 is inserted into the through hole 17. Further, the support shaft 18 also penetrates the through hole 16 of the clip 12. Further, the support shaft 18 is also inserted with a torsion coil spring 19 having a coil portion mounted between the shaft cylinder 1 and the clip 12. That is, the ball portion 14 of the clip 12 is urged toward the shaft tube 1 by the torsion coil spring 19.

A cursive unit 20 is arranged in the shaft cylinder 1 so as to be able to move back and forth and to be able to protrude from the tip of the tip member 8. In this example, the cursive unit 20 is a mechanical pencil unit that extends a pencil lead. Details will be described below. A core tank 23 that accommodates a plurality of cores is disposed in the middle shaft 22 urged rearward by a resilient member 21 such as a coil spring, and can be moved back and forth. A chuck body 25 for holding and opening the core is fixed through two joints 24. A chuck ring 26 that opens and closes the chuck body 25 is surrounded in front of the chuck body 25. Further, a tip 27 is fixed to the front of the middle shaft 22 by means such as screwing, and a lead detent member 28 made of a rubber-like elastic body that prevents the lead from retreating is provided on the tip 27. It is installed internally. Reference numeral 29 denotes a guide pipe that guides the lead that has been fed out, and reference numeral 30 denotes an elastic member such as a coil spring that urges the lead tank 23 and the chuck body 25 toward the rear.
A vertical protrusion 31 is formed in the longitudinal direction of the front inner peripheral surface of the front shaft 2, and a vertical groove 32 formed on the front outer peripheral surface of the middle shaft 22 is fitted in the vertical protrusion 31. Is engaged. The vertical protrusions 31 and the vertical grooves 32 are formed at four equally spaced locations, but may be at three locations or at five locations. That is, the relative rotation between the front shaft 2 and the middle shaft 22 is prevented by the engagement between the vertical protrusions 31 and the vertical grooves 32.
The front shaft 22 is formed from a resin material such as polyacetal or polypropylene, but may be formed from a metal material such as stainless steel or brass. By using a resin material, it can be manufactured at a low cost and can be reduced in weight.

  On the other hand, an eraser receiving member 33 is fixed behind the lead tank 23, and an eraser 34 is detachably attached to the rear of the eraser receiving member 33. A knock member 35 is detachably press-fitted behind the eraser receiving member 33 so as to cover the eraser 34. The core tank 23 is formed of a metal material such as stainless steel or brass, but may be formed of an inexpensive resin material such as polyacetal or polypropylene.

A large-diameter portion 36 is formed at the rear portion of the middle shaft 22, and the rear end surface portion 36 a of the large-diameter portion 36 is an engaging portion with the ball portion 14 of the clip 12. That is, when the cursive unit 20 protrudes, the rear end surface portion 36a of the large-diameter portion 36 contacts and engages with the front end surface portion 14a of the ball portion 14 of the clip 12, so that the cursive unit 20 moves backward. As a result, the protruding state of the cursive unit 20 is maintained. In this example, the engagement is maintained by the contact between the “surface” of the rear end surface portion 36 a of the middle shaft 22 and the “surface” of the front end surface portion 14 a of the ball portion 14. That is, in almost all regions from the upper end portion 14c to the lower end portion 14d of the front end surface portion 14a of the ball portion 14, the rear end surface portion 36a of the middle shaft 22 is in contact with each other. It can be received on the “face”.
In this example, the vicinity of the lower end portion 14d of the ball portion 14 is hung on a part of the core tank 23, so that the ball portion 14 can be surely entered into the shaft tube 1, and the center shaft In addition to increasing the area of engagement with 22, the tip surface of the clip 12 can be buried from the surface of the shaft cylinder 1.
Here, when the rear portion of the clip 12 is pressed in the direction of the shaft tube 1 with a finger or the like, the front of the clip 12 is separated from the shaft tube 1 and widened, and at this time, the large diameter of the tip surface portion 14a of the ball portion 14 and the middle shaft 33 The engagement with the rear end surface portion 36 a of the portion 36 is released, and the cursive unit 20 moves rearward by the urging force of the elastic member 21. As a result, the cursive unit 20 is immersed in the barrel 1. In the disengagement process (see FIGS. 9 to 11), the lower end portion 14 d of the tip surface portion 14 a of the ball portion 14 performs an arc motion along with the rotation of the clip 12. The portion 14d slides while continuously contacting the region of the rear end surface portion 36a of the middle shaft 22.

A second example will be described with reference to FIGS. When the cursive unit 20 is protruded, that is, when the cursive unit 20 (middle shaft 22) and the clip 12 are engaged, the upper end portion 14c of the front end surface portion 14a of the ball portion 14 is connected to the outer peripheral edge of the rear end of the middle shaft 22. This is an example of contact / engagement with 36b. In this example, although it is in contact with the rear outer peripheral edge 36b of the middle shaft 22 at the time of engagement, the front end surface portion 14a of the ball portion 14 of the clip 12 is The lower end portion 14d of the ball portion 14 slides while continuously contacting the region of the rear end surface portion 36a of the center shaft 22 (see FIG. 14). To get.
In this way, in the disengagement process, the contact area is increased by bringing the front end surface portion 14a of the ball portion 14 into surface contact with substantially the entire region of the rear end surface portion 36a of the middle shaft 22, and as a result, the elastic member 21 The urging force can be dispersed, and the rear end surface portion 36a can be prevented from being damaged. Further, even when the engagement is released, the upper end portion 14c of the ball portion 14 is in point contact with the rear end outer peripheral edge portion 36b of the middle shaft 22, so that the engagement can be easily released.

When the cursive unit 20 shown in FIG. 15 and FIG. 16 is protruded, that is, when the cursive unit 20 (medium shaft 22) and the clip 12 are engaged, the tip surface portion 14a of the ball portion 14 is illustrated. This is an example in which the lower end portion 14 d of this is in contact with and engaged with the rear end inner peripheral edge portion 36 c of the middle shaft 22. In this example, at the time of the engagement, the lower end portion 14d of the front end surface portion 14a of the ball portion 14 is brought into contact / engagement with the rear end inner peripheral edge portion of the middle shaft 22 to 36c. Is configured such that the lower end portion 14d of the ball portion 14 can slide while continuously contacting the region of the rear end surface portion 36a of the middle shaft 22 (see FIG. 16).
In this way, the lower end portion 14d of the front end surface portion 14a of the ball portion 14 is brought into contact with and engaged with the rear end inner peripheral portion 36c of the middle shaft 22 so that the rear end inner peripheral portion is urged by the urging force of the elastic member 21. Even if the portion is deformed so that 36c is beaten, the engagement between the central shaft 22 and the ball portion 14 is maintained. If it is strong, the lower end part 14d of the ball | bowl part 14 will bite into the rear-end inner peripheral part 36c of the center shaft 22, and the said engagement effect | action will become firm.

  A fourth example will be described with reference to FIG. In this example, the rear end surface of the middle shaft 22 is inclined toward the outer diameter direction (rear end inclined surface 37), but may be inclined toward the inner diameter direction (fifth example, FIG. 18; rear end inclined surface 38). ). On the other hand, the ball portion 14 of the clip 12 is formed with a front end surface portion 14a that comes into surface contact during contact / engagement. In this manner, when the front end surface portion 14a of the ball portion 14 is brought into surface contact with substantially the entire region of the rear end inclined surfaces 37 and 38 of the middle shaft 22 at the time of engagement, the contact area is increased. 21 can be dispersed, and the rear end inclined surfaces 37 and 38 can be prevented from being damaged.

A sixth example will be described with reference to FIGS. In this example, the clip 12 is made of a resin material and molded by means such as injection molding, and the ball portion 39 in this example is formed over the entire area of the front lower end of the clip 12. That is, in each of the above examples, the space portion 14b is formed between the opposing ball portions 14, but in this example, the space portion does not exist and is in a solid state. By making the ball part innocuous, the rigidity of the ball part 39 is increased and the deformation of the ball part 39 is prevented.
In any of the fourth to sixth examples, as in the first to third examples, the ball unit is used during the immersion operation of the writing unit, that is, in the process of releasing the engagement. Can slide while continuously contacting the rear end surface portion of the middle shaft.

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Front axis | shaft 3 Rear axis | shaft 4 Grip member 5 Protrusion part 6 Outer cylinder 7 Through-hole 8 Tip member 9 Front-end opening part 10 Front window hole 11 Back window hole 12 Clip 13 Connection member 14 Ball | bowl part 15 Raised part 16 Through-hole DESCRIPTION OF SYMBOLS 17 Through-hole 18 Support shaft 19 Torsion coil spring 20 Cursive unit 21 Repelling member 22 Middle shaft 23 Core tank 24 Joint 25 Chuck body 26 Chuck ring 27 Tip 28 Core detent member 29 Guide pipe 30 Repelling member 31 Vertical protrusion 32 Vertical groove 33 Eraser receiving member 34 Eraser 35 Knock member 36 Large diameter portion 37 Rear end inclined surface 38 Rear end inclined surface 39 Ball portion

Claims (4)

A cursive unit is placed inside the barrel so that it can appear and retract, and the outer circumference of the cursive unit surrounds the middle shaft, and a clip is placed on the barrel, and a ball is provided at the front of the clip. In the process of releasing the maintenance of the projecting state, the pendant is a retractable writing tool that maintains the projecting state of the cursive unit from the shaft cylinder by locking the ball part to the middle shaft of the cursive unit. A retractable writing instrument in which the ball portion of the clip is continuously brought into contact with the engaging portion of the central shaft, and the engaging portion is provided in the shaft tube. The retractable writing instrument according to claim 1, wherein at least the vicinity of the lower end of the ball portion of the clip is brought into contact with the central shaft. The retractable writing instrument according to claim 1, wherein the ball portion is formed on both side portions of the clip, and a space portion is formed between the ball portions by the ball portions formed on both side portions thereof. The retractable writing instrument according to any one of claims 1 to 3, wherein when the ball portion of the clip is locked to the central shaft, the surface of the front portion of the clip is buried with respect to the surface of the shaft tube.