JP5321709B2 - Writing instrument clip - Google Patents

Description

  The present invention relates to a clip for a writing instrument in which a clip member is configured to be separable from a shaft tube and has a biasing means for biasing the clip member to the shaft tube.

  2. Description of the Related Art Conventionally, a clip that urges a front portion of a clip member toward a shaft cylinder outer wall surface and can further separate a clip member front portion from the shaft tube is well known. Japanese Patent Application Laid-Open No. 2006-130800 discloses a device in which the urging and separating means of the clip member is a coil spring. Registered Utility Model Publication No. 3046649 discloses that uses a torsion coil spring as a biasing and separating means.

JP 2006-130800 A Registered Utility Model No. 3046649

  In the prior art described above, various devices have been devised with respect to the fixing position and shape, for example, forming a recess in the end winding portion of the coil spring so as to withstand repeated use.

  However, in the prior art using a coil spring, in order to provide sufficient durability to withstand repeated use at the same time as exerting the urging force (clip clamping force) to the shaft cylinder at the front of the clip member The width of the rear part of the clip member has to be increased by means of the fixing position and the like. Furthermore, when hiding the coil spring arranged behind the clip fulcrum, the rear part of the clip member has to be large. Furthermore, it is difficult to say that the conventional technique using a torsion coil spring has sufficient durability.

  An object of the present invention is to provide a clip for a writing instrument that has sufficient clip clamping force / durability as a clip for a writing instrument and can widen the range of design.

The present invention includes a barrel, and the clip member, with its having a regulating means for regulating the spacing amount from the barrel end of the clip member, and the regulating means and the connecting means of the shaft tube and the clip member, The gist is that a joining ring is formed in front of the connecting means .

  Since the distance from the shaft tube at one end of the clip member is regulated, there is no fear of use in a range where a load is applied to the extent that the spring is damaged. Further, the restricting means is a connecting means between the shaft tube and the clip member, and the restricting portion is provided on the connecting member. For this reason, even when an excessive force is applied to the clip, the connecting member arranged so as to ride on the outer periphery of the shaft tube is restricted from moving on the outer periphery of the shaft tube, and the clip does not come off together with the connecting member. , Greater durability can be obtained. Further, the shaft tube and the connecting member, and the clip and the connecting member may be integrated or separate members.

  The present invention has a clip holding force and durability sufficient as a clip for a writing instrument by the above-described configuration, and at the same time has an effect of widening the range of design.

  Next, with reference to FIG. 1 and FIG. 2, a configuration relating to the clip of the writing instrument in the present invention will be described.

  A ball portion 2 is formed in front of the clip member 1, and a locking portion 3 is formed on the ball portion 2. A plate-like raised portion 4 that protrudes in the axial direction is formed oppositely in the middle of the clip member 1, and a through hole 5 is formed near the center of the raised portion 4. A box-shaped connecting member 7 is arranged inside the raised portions 4, and a torsion coil spring 6 is arranged inside the box-shaped connecting member 7. A through hole 8 is formed on the side surface of the connecting member 7. By inserting the fixing pin 9 into the through-hole 8, the above-described through-hole 5, and the coil portion inner hole of the torsion coil spring 6, the fixing pin 9 can be rotated so that the clip member 1 can rotate about the fixing pin 9. The through hole 8, the through hole 5, and the torsion coil spring 6 are locked. A locking groove 10 is formed in the fixing pin 9, and the inner wall of the through hole 8 is fitted into the locking groove 10.

  Further, a ring-shaped joining ring 11 extending in the axial tube direction is formed at the front end of the connecting member 7. Further, two window holes 13 and 14 are formed in the shaft cylinder 12. The window hole 13 located at the rear is a rectangle formed long in the longitudinal direction.

  Next, assembly will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part and the description is abbreviate | omitted about what was once demonstrated. In addition, the suffix is omitted when there is no particular problem in the description.

When assembling, first, the clip set 15 in which the clip member 1, the torsion coil spring 6, and the connecting member 7 are fixed by the fixing pin 9 is assembled, and then the joining ring 11 is inserted into the window hole 13. Since the diameter of the joining ring 11 is larger than the lateral width of the window hole 13, first, the clip member is inserted so as to be perpendicular to the shaft tube, and then rotated so that the clip member and the shaft tube are parallel. Installing.
A female thread 16 is formed at the rear end of the shaft cylinder, and a cylindrical rear metal 17 having a male thread 18 formed therein is screwed therein. The rear metal 17 is formed with a large diameter portion 19 at the rear end and a reduced diameter portion 20 at the front end, and the reduced diameter portion 20 is inserted into the joining ring 11. Further, the press-fitting ring 21 is inserted from the front of the shaft tube and is press-fitted into the reduced diameter portion 20, whereby the joining ring 11 is fixed to the rear metal 17. Further, an eraser receiver 22 is inserted into the rear metal 17 from the front of the press-fitting ring 21, and a writing body 23 is disposed in front of the eraser receiver 22. The writing body 23 is composed of a mechanical pencil unit, a refill eraser, or the like, and may have any configuration as long as it has a writing function as a writing instrument, an erasing function as an eraser, and the like.

  Further, the ball portion 2 enters the window hole 14. A locking member 24 is formed in the center portion of the lead tank 23, and the locking member 24 is locked to the locking portion 3 of the ball portion 2 and keeps the protruding state when the writing body protrudes. The front end of the writing body 23 is immersed by releasing the locking by pressing the rear part of the clip member.

  Here, the structure of the torsion coil spring 6 and the connecting member 7 will be described in detail with reference to FIGS.

The torsion coil spring 6 is biased toward the side away from the shaft tube by the one arm portion 25 coming into contact with the rear rear surface of the clip member 1. With this urging force, the front of the clip member is urged toward the axial tube direction. The connecting member 7 has a box shape and is formed by bending a single plate. A groove 27 and a window hole 28 are formed behind the connecting member 7. The other arm portion 26 of the torsion coil spring 6 is inserted into the window hole 28 and biases the connecting member 7 toward the shaft tube side. Further, the both arm portions pass through a fixed pin 9 through a coil portion formed in front of the both arm portions, and rotate around the fixed pin 9 as a fulcrum.
Thus, by bringing the arm part 26 out of the connecting member 7, the lower end of the arm part 26 is not caught by the shaft tube, and a more stable clip operability can be obtained. At this time, by assembling so that A-B> 0 °, the fixing pin 9 is always urged by keeping the clip member in a constantly urged state, and does not come off. Further, by assembling so that A−B = 0 °, the urging force at the time of assembling is eliminated, and the assembling can be performed more easily.
In addition, inclined portions 29 are formed at both upper ends of the connecting member 7 so that the clip member and the connecting member can move without interference when the clip member is pressed. A protrusion 30 is formed at the lower rear side of the connecting member 7, and the protrusion 30 enters the window hole 13 to prevent the connecting member 7 from moving in the circumferential direction.

It should be noted that the arm portion 26 is moved out of the connecting member 7 by bending the tip of the arm portion of the torsion coil spring, changing the length of the arm portion of the torsion coil spring, changing the shape of the connecting member 7 or the like. It can form without. As a result, the design range of the clip can be widened. The shape of the connecting member 7 and the like is not limited to a box shape, and may be any shape as long as it is a plate shape or the like and can hide all or part of the elastic member.
Moreover, since the fixing pin 9 which becomes a fulcrum passes through the coil portion of the torsion coil spring 6 by forming the connecting member 7 in a box shape, the clip portion can be hidden by the connecting member 7 necessary as a fulcrum. The appearance of can be made clean.

  Next, the operation when the clip is pressed will be described with reference to FIG.

  When the rear side of the clip member 1 is pressed, the front side of the clip member 1 is lifted with the fixing pin 9 disposed in front of the contact portion of the both arm portions 25 and 26 with the connecting member 7 as a fulcrum. At this time, if the front part of the clip member is lifted too much, it causes fatigue of the spring, so that the amount of displacement is regulated. As the restricting means, in the present invention, the upper part of the rear end of the box-shaped connecting member 7 is used as a restricting portion 31, and means for contacting the arm portion 25 of the torsion coil spring 6 with the restricting portion 31 is used. The arm portion 25 is in contact with the clip member 1. For this reason, the rear end of the clip member does not hit the shaft tube, and the shaft tube is not damaged. Further, a gap is formed in part between the restricting portion 31 and the clip member 1 by interposing the arm portion 25. For this reason, abrasion of a control part can be suppressed and durability can be increased more.

  The connecting member 7 and the restricting portion 31 described above may have any shape as long as they have similar functions.

  Next, the reason why the joining ring 11 is formed in front of the connecting member 7 will be described with reference to FIG.

When the clip is lifted with an excessive force or the rear end of the clip is pushed, a force is applied to the fulcrum of the clip member 1 in a direction away from the shaft tube. At this time, the separation force can be reduced to some extent by the rear portion of the clip member and the connecting member 7 colliding with the shaft tube. This is the case where the joining ring 11 is arranged behind the connecting member 7. However, when the clip is lifted with a larger force, a large separation force acts on the fulcrum of the clip member 1 with the rear portion of the clip member or the contact portion between the connecting member 7 and the shaft tube as a fulcrum. In other words, since there is no member that restricts the movement of the front of the connecting member 7, it is possible to lift the tip of the clip member until the connecting member 7 breaks at the joint with the joint ring 11. However, by forming the joining ring in front of the connecting member, the force applied to the connecting member 7 when the tip end of the clip member is lifted or the rear end of the clip member is pushed is based on the joint portion with the joining ring 11. Since the force is directed toward the shaft tube side, the connecting member 7 arranged so as to ride on the outer periphery of the shaft tube is regulated by the shaft tube and also by the joining ring 11, and does not move any further, and the clip Since the tip of the member is not lifted more than necessary, there is no possibility of breaking from the joint portion with the joint ring.
As described above, the above-mentioned separation preventing action can prevent the clip from being separated to some extent even if the joining ring is not in front, so it may be formed in the rear of the connecting member 7 but may be formed in the front. desirable.

  In this example shown in the drawings, A = 35 degrees, B = 21 degrees, spring wire diameter = 0.8 mm, coil part average diameter D = 3.2 mm, number of turns N = 2, and arm part length a1 = 10. Although 3 mm and a2 = 6.1 mm were used, it is not limited to this, unless it deviates from a claim.

  Next, examples and comparative examples in the present invention will be described.

First, the clip clamping force will be described with reference to Table 1. Table 1 shows the clip clamping force when the amount of displacement at the tip of the clip member is 3 mm. The experiment was performed at an interval of 5 ° from a free angle A of the torsion coil spring from 20 ° to 45 °. As evaluation criteria, those having a clip clamping force of less than 200 g were evaluated as x when the clip clamping force was insufficient, those having a clip clamping force of 200 g or more and less than 250 g were evaluated as “good”, and those having a clip clamping force of 250 g or more as “good”. That is, if the clip clamping force is 200 g or more, the object of the present invention can be achieved.
As can be seen from Table 1, in the comparative example with the free angle A = 20 °, the clip clamping force is insufficient. The comparative example with a free angle A = 45 ° can theoretically exhibit a sufficient clip clamping force, but only 170 g was exhibited in this comparative example. This is presumably because a load exceeding the durability of the torsion coil spring is applied when measuring the holding force of the spring.
As described above, it was found that when the range of A is 25 ° ≦ A ≦ 40 °, preferably 35 ° ≦ A ≦ 40 °, the clip holding force suitable as a writing instrument can be exhibited.

Next, durability will be described based on Table 2. A value of angle change rate P = (A−B) / A × 100 was used as an index that best represents the durability of the clip. Moreover, in order to vary the value of AB, the free angle A, the assembly angle B, etc. were selected suitably. In addition, as an evaluation standard, a function that becomes insufficient as a clip after a pressing operation of less than 20,000 times is regarded as being insufficient in durability. It was marked as ◎ as good.
As is clear from the results of Table 2, in the comparative example in which P = 68% and P = 75%, sufficient durability as a clip for a writing instrument could not be obtained. In the example in which P = 65%, slightly good durability was obtained. In the example in which P = 40%, good durability was obtained.
From the above, it was found that the range of P is 0 ≦ P ≦ 65%, more preferably 0 ≦ P ≦ 40%, in order to exhibit sufficient durability as a clip of a writing instrument.

The exploded perspective view of a clip set. The perspective view of a shaft cylinder. The disassembled perspective view of a shaft cylinder rear part. The exploded perspective view of FIG. The rear perspective view of a control member and a torsion coil spring. The half sectional view showing the maximum energized state. The assembly figure of a shaft cylinder rear part.

DESCRIPTION OF SYMBOLS 1 Clip member 2 Ball | bowl part 3 Locking part 4 Raised part 5 Through-hole 6 Torsion coil spring 7 Connecting member 8 Through-hole 9 Fixing pin 10 Locking groove 11 Joint ring 12 Shaft cylinder 13 Window hole 14 Window hole 15 Clip set 16 Female screw 17 Back Metal 18 Male Thread 19 Large Diameter Part 20 Reduced Diameter Part 21 Press-Fit Ring 22 Eraser Receiver 23 Writing Body 24 Locking Member 25 Arm Part 26 Arm Part 27 Groove 28 Window Hole 29 Inclined Part 30 Protruding Part 31 Regulating Part

Claims (3)

A shaft cylinder, a clip member, and a restricting means for restricting a distance from the shaft cylinder at one end of the clip member. The restricting means is a connecting means for the shaft cylinder and the clip member, and the front of the connecting means. A clip for writing instruments, characterized in that a joining ring is formed on the clip.   2. The clip of the writing instrument according to claim 1, wherein a gap is provided between the rear end of the clip member and the shaft tube in the maximum biasing action state of the clip member.   3. A clip for a writing instrument according to claim 1, wherein a gap is provided between a rear portion of the clip member and a restricting action portion of the restricting means in the maximum urging action state of the clip member.

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