JP2009241089A - Bending structure of plate-like member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, when performing a bending work, because the vicinity of the surface on the outside of the bent part is stretched and the vicinity of the surface on the inside is compressed, the compressed potion generates and forms bulged parts in the top part of a corner part where is bent and, the amount of opening of a clip is limited by means of the formation of the bulged part, that is, when trying to open the clip by pressing the rear end of the clip with a finger or the like, because the bulged part is brought into contact with the surface of a barrel, as the result, the amount of opening of the clip is limited, the size of the bulged part is variable and various, therefore, variation is also generated on the amount of the opening in addition to the limitation of the amount of the opening of the clip. <P>SOLUTION: In the bending structure of a plate-like member, a depressed/recessed part is formed in the top part of a bent corner part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bending structure for a plate-like member, and more particularly to a connection structure comprising a plate-like member for connecting a clip of a writing instrument and a shaft tube.

  As an example, there is a clip in which the end edge portion of a metal plate member is bent inward to form a box shape. In detail, the rectangular plate-like member is formed by being bent at the periphery of the three sides with the side wall hanging down.

Japanese Utility Model Publication No. 61-166891

However, a fine bulge is formed at the top of the bent corner by bending. That is, when performing the bending process, the vicinity of the outer surface of the bent portion is stretched, but the vicinity of the inner surface is compressed, so that the compressed portion becomes a bulging portion at the top of the bent corner portion. It is generated and formed.
And since the bulging part is formed, the amount of expansion of the clip has been limited. In other words, when the rear end of the clip is pressed with a finger or the like and the clip is to be expanded, the bulging portion comes into contact with the surface of the shaft tube, and as a result, the amount of expansion of the clip is limited. It will end up.

  Further, the size of the bulging portion is not constant but varies, and therefore, the amount of expansion has also varied in addition to the limitation on the amount of expansion of the clip.

  The gist of the present invention is a folding structure of a plate-like member, in which a recessed portion is formed at the top of the bent corner.

  The present invention is a folded structure of a plate-like member, and since a concave portion is formed at the top of the bent corner, it is possible to prevent the occurrence of a bulging portion at the top of the bent corner. .

The operation will be described. By bending the plate-like member, a fine bulge is formed at the top of the bent corner, but the fine bulge is formed at the bottom of the recess.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As an example, a connection structure between a clip and a shaft cylinder 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 6 a 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 toward the axial tube 1 is formed. The ball portions 14 are slightly approaching each other in the direction of the shaft tube 1. Entry into the front window hole 10 formed in the rear shaft 3 is facilitated. 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, so that it can be easily guided to the front window hole 10.
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 circular ring portion 19 that fits into the rear shaft 3 is formed on the front surface 13a configured as a front portion, and a joint portion 20 that is formed by bending a plate-like member is formed on the rear surface 13b. ing. That is, the rear surface 13 b is divided into two by the joint portion 20. A notch 21 is formed on the lower left side and the upper right side of the rear surface 13b divided into two (see FIG. 7), and end portions of torsion coil springs, which will be described later, are positioned in the notch 21 respectively. It has become.
Further, it is formed by bending the side surface 13c and the rear surface 13b of the connecting member 13, and a V-shaped recessed portion 23 is formed at the top of the corner portion 22 in the bent portion. The recessed portion 23 may be formed at the top of the four corner portions 22 formed by bending the plate-like member, but in this example, only the portion where the bottom surface of the clip 12 contacts. Forming. FIG. 8 shows the state of the plate before the box-shaped connecting member 13 is bent, where the plate-like member is bent, and the end surface of the bent portion is directed in the thickness direction. A V-shaped recess 23 having a parallel width and a depth is formed. In the figure, the dotted line is the part to be bent.
By bending the plate-like member, a bulge is generated and formed at the bottom of the recess 23, but the bulge is fine and does not exceed the top of the recess 23. ing. Therefore, the amount of expansion of the clip 12 from the shaft cylinder 1 does not vary, and a certain amount of expansion can be obtained.

A through hole 24 is formed in a substantially central portion of the side surface 13 c of the connecting member 13, and a support shaft 25 is inserted into the through hole 24. Further, the support shaft 25 also penetrates the through hole 16 of the clip 12. Further, the support shaft 25 is also inserted with a torsion coil spring 26 having two coil portions 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 26.
A flange portion 25a is formed at both ends of the support shaft 25, and a small diameter portion 25b is formed inside the flange portion 25a. The space between the small diameter portions 25b is a large diameter portion 25c which is larger than the small diameter portion 25b but smaller than the flange portion 25a. The diameter of the large-diameter portion 25c is substantially the same as the inner diameter of the through hole 24 of the connecting member 13, but is slightly smaller. The rotation with respect to the through hole 24 is possible. A locking projection 25d is formed on the circumference in the vicinity of one end of the large-diameter portion 25c of the support shaft 25. The locking protrusion 25 d is smaller than the through hole 16 of the clip 12, but is slightly larger than the through hole 24 of the connecting member 13. That is, when the locking protrusion 25d of the support shaft 25 passes through the through hole 24 of the connecting member 13, the diameter is slightly reduced by its own elastic deformation, and is restored after passing.
When the support shaft 25 is inserted into the through hole 16 of the clip 12, the through hole 24 of the connecting member 13, and the torsion coil spring 26, the small diameter portion 25 b of the support shaft 25 is applied by the biasing force of the torsion coil spring 26. The inner peripheral edge of the through hole 16 of the clip 12 is fitted into the clip 12. This fitting prevents the support shaft 25 from falling off the clip 12 or the connecting member 13. Further, the locking protrusion 25d on the circumference formed on the large-diameter portion 25c of the support shaft 25 is inserted over the through hole 24 of the connecting member 13, so that the locking protrusion 25d is formed on the connecting member 13. It comes to be located inside the through hole 24. As a result, the clip 12 and the connecting member 13 are sandwiched by the locking projection 25d and the flange portion 25a, and the dropping of the support shaft 25 from the clip 12 and the connecting member 13 is also prevented by this sandwiching action. It is.
One end of the torsion coil spring 26 is bent in a direction parallel to the support shaft 25 to form an L-shape (L-shaped portion 27), and the L-shaped portion 27 is formed on the bottom surface of the clip 12. In contact. By increasing the contact area to the clip 12, the shift of the axis of the clip 12 with respect to the axis of the barrel 1 in the front view is prevented and the stability is improved. On the other hand, the other end of the torsion coil spring 26 is located in the notch 21 of the connecting member 13.

  The ring portion 19 of the connecting member 13 is inserted through the rear window hole 11 and is sandwiched between a press-fit ring 28 and a core 29 that are press-fitted and fixed to the inner surface of the rear shaft 3. The connecting member 13 is fixed to the press-fitting ring 28 and the core 29 by this clamping action, but is not fixed to the rear shaft 3. Reference numeral 30 denotes a tail plug disposed at the rear part of the rear shaft 3, and the tail plug 30 is connected to the core 29 by screwing. That is, by tightening the tail plug 30 with respect to the core 29, the core 29, the connecting member 13, and the like are retracted, and the ring member 19 of the connecting member 13 is moved backward by the connecting member 13. The connecting member 13 is fixed to the rear shaft 3 by contacting the reduced diameter portion of the rear window portion 11. Then, the clip 12 is also integrally fixed to the rear shaft 3 by fixing the connecting member 13 to the rear shaft 3.

A cursive unit 31 is arranged in the shaft cylinder 1 so as to be movable back and forth and to be able to protrude from the tip of the tip member 8. In this example, the cursive unit 31 is a mechanical pencil unit that feeds out a pencil lead. Details will be described below. A core tank 34 that accommodates a plurality of cores is disposed in the middle shaft 33 urged rearward by a resilient member 32 such as a coil spring so as to be movable back and forth. A chuck body 36 for holding and opening the core is fixed via 35. A chuck ring 37 that opens and closes the chuck body 36 surrounds the front of the chuck body 36. Further, a tip metal 38 is fixed to the front of the middle shaft 33 by means such as screwing, and a core detent member 39 made of a rubber-like elastic body that prevents the core from retreating is provided on the tip metal 38. It is installed internally. Reference numeral 40 denotes a guide pipe that guides the lead that has been fed out, and reference numeral 41 denotes an elastic member such as a coil spring that urges the lead tank 34, the chuck body 36, and the like backward.
On the other hand, an eraser receiving member 42 is fixed behind the lead tank 34, and an eraser 43 is detachably attached to the rear of the eraser receiving member 42. A knock member 44 is detachably press-fitted behind the eraser receiving member 42 so as to cover the eraser 43.
A large-diameter portion 33 a is formed at the rear portion of the intermediate shaft 33, and the rear end portion of the large-diameter portion 33 a is an engagement portion 45 with the ball portion 14 of the clip 12. That is, when the cursive unit 31 protrudes, the rear end portion of the large-diameter portion 33a is engaged with the ball portion 14 of the clip 12, thereby preventing the cursive unit 31 from retreating. The protruding state of the body unit 31 is maintained.
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. At this time, the engagement between the ball portion 14 and the large diameter portion 33a of the middle shaft 33 is increased. The engagement with the joint portion 45 is released, and the writing unit 31 moves rearward by the urging force of the elastic member 32. As a result, the cursive unit 31 is immersed in the shaft cylinder 1.

A second example will be described with reference to FIGS. It is a modification of the shape of the said recessed part. The recess 46 in this example is an example in which the width is widened in the direction of bending in the thickness direction of the plate-like member and the depth is parallel in the depth direction. That is, in the width direction, the recessed portion 46 is formed with a narrow portion 46a on the outside and a wide portion 46b that gradually widens from the narrow portion 46a on the inside.
A third example will be described with reference to FIGS. The recessed portion 47 of this example is an example in which the depth is deeply formed in the direction of bending in the thickness direction of the plate-like member and the width is parallel in the width direction. That is, in the depth direction, the recessed portion 47 is formed with a shallow portion 47a on the outside and a deep portion 47b that is gradually deepened from the shallow portion 47a on the inside.
These second and third examples may be combined. That is, in the thickness direction of the plate-like member, a narrow portion is formed outside the recessed portion, and a wide portion gradually widening from the narrow portion is formed inside, and a shallow portion is formed outside the recessed portion in the depth direction. The deep part gradually deepened from the shallow part may be formed inside.
In any of the examples, the recessed portion formed on the outer side is small, and as a result, the appearance appearance can be prevented from being deteriorated and the strength is also improved.
A fourth example will be described with reference to FIGS. In this example, in addition to the concave portion 23 of the first example, a concave portion 48 is also formed on the inner surface of the corner portion 22 to be bent.
By forming the recessed portion 48 also on the inner surface of the corner portion 22 to be bent as in this example, the ease of processing, that is, the bending processing is facilitated.

The side external view which shows a 1st example. The longitudinal cross-sectional view of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. BB sectional drawing of FIG. The external appearance perspective view which assembled the clip, the connection member, and the torsion coil spring. FIG. 6 is an exploded view of FIG. 5. The external appearance perspective view which shows a connection member. The principal part expanded view of FIG. The external appearance perspective view which shows the connection member of the 2nd example. The principal part expanded view of FIG. FIG. 11 is a top view of FIG. 10. The principal part expanded view of the connection member which shows the 3rd example. FIG. 13 is a top view of FIG. 12. The external appearance perspective view of the connection member which shows the 4th example. The principal part expanded view of FIG. The top view of FIG.

Explanation of symbols

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 19 Ring part 20 Joint part 21 Notch part 22 Corner part 23 Recessed part 24 Through-hole 25 Support shaft 26 Torsion coil spring 27 L-shaped part 28 Press-fit ring 29 Core 30 Tail plug 31 Curtain unit 32 Rebound member 33 Central axis 34 Core Tank 35 Joint 36 Chuck body 37 Chuck ring 38 Lead metal 39 Core detent member 40 Guide pipe 41 Repellent member 42 Eraser receiving member 43 Eraser 44 Knock member 45 Engaging portion 46 Recessed portion 47 Recessed portion 48 Recessed portion

Claims (3)

A folding structure for a plate member, wherein a concave portion is formed at the top of the bent corner. The plate-like member bending structure according to claim 1, wherein the width of the recessed portion is reduced from the inner side to the outer side where the concave portion is bent. The plate member bending structure according to claim 1 or 2, wherein a recessed portion is formed on an inner surface of the bent corner portion.

Images