JP4922909B2 - Clip attachment structure for writing instruments - Google Patents

Description

  The present invention relates to a clip attachment structure for a writing instrument, and further relates to a clip attachment structure for a writing instrument that expands greatly when a tail end portion of the clip is pushed.

Conventionally, as a clip mounting structure of a writing instrument in which the tip end of the clip is separated from the shaft tube and expands when the tail end of the clip is pushed, for example, a pair of grooves are formed on the surface of the raised portion of the shaft tube and the clip, A tip arc-shaped protrusion formed on the clip is placed on an arc-shaped recess formed on the raised portion of the shaft tube, and this is used as a rotation fulcrum, and a spring made of a U-shaped wire is fitted into these grooves. A clip is known which is attached to a shaft cylinder so as to be rotatable about a fulcrum. (See Patent Document 1)
JP 2006-192724 A

  In the above clip mounting structure, since the clip is not pivotally supported by the shaft cylinder, the structure is simple, but rattling tends to occur, and the holding of the clip is unstable. In addition, it takes time to form grooves in the clip and the shaft cylinder, and there is also a problem that it takes time to assemble the spring made of a wire rod into these grooves.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a clip mounting structure for a writing instrument that has a simple structure and is easy to assemble and that can securely mount the clip to a shaft tube so as to be pivotable.

  In order to achieve such an object, the clip mounting structure for a writing instrument of the present invention has a locking hole formed on each of the tail ends of a pair of bent pieces obtained by bending both side edges in the axial direction of the clip body inward. In addition, an arc-shaped notch having a radius of curvature equal to or slightly larger than the radius of curvature of the locking hole is formed on the end surface of the bent piece immediately above the locking hole, and an inwardly inclined surface is formed on the inner surface including the arc-shaped notch, A clip in which first and second inward walls perpendicular to the bent piece are formed on the tail end side of the clip main body, and a pair of mounting walls erected in the axial direction on the tail end side, respectively, face outward. A spring arrangement comprising a shaft cylinder with a pivotal support projecting on the torsion coil spring and a torsion coil spring, with the inside of the clip facing upward, and defined by a pair of bent pieces, a first wall and a second wall A torsion coil spring is dropped into the space, and the pivot of the shaft cylinder The torsion coil spring is repelled so that the tail end of the clip is separated from the surface of the shaft tube, and the ball at the tip of the clip is pressed against the surface of the shaft tube. .

  In this way, since the pivot support shaft of the shaft tube is engaged with the locking hole of the clip, the clip can be securely attached to the shaft tube without being rattled. Since the rotation support shaft is provided on the attached mounting wall, when the tail end side of the clip is pushed, the tip end of the clip is greatly expanded and can be inserted into a thick paper such as a panel. Also, the torsion coil spring is dropped into the spring arrangement space defined by the pair of bent pieces, the first wall and the second wall with the inside of the clip facing upward, and the rotation support shaft of the shaft tube is cut into an arcuate shape. And it can be assembled simply by guiding and engaging with the locking hole of the clip using the inclined surface, and the assembling work is easy. Furthermore, a torsion coil spring is used as a spring member, but the torsion coil absorbs the deflection of the entire wire rod compared to a plate-shaped U-shaped spring, which is usually used for clips. Are better.

  The best mode for carrying out the invention will be described below with reference to the drawings. In FIG. 1, a well-known in / out mechanism including a rotor 41 and a pressing element 42 is built in the tail end side of the shaft tube 1, and when the pressing element 42 is knocked, a refill 43 of a ballpoint pen advances and can be written. However, a detailed description of this infestation mechanism is omitted. A cylindrical tail crown 21 is screwed to the tail end of the shaft cylinder 2. However, the shaft cylinder 2 and the tail crown 21 are not separate parts and may be integrally formed. That is, the tail cap 21 is a part of the shaft cylinder 2 in the present application. As shown in FIG. 4, a pair of attachment walls 22 in the axial direction is formed on the tail cap 21. The mounting wall 22 is provided with rotating support shafts 23 and 23 projecting outward, and one end of the rotating support shaft 23 is an inclined surface 23a. A small drop prevention wall 24 is formed outward at the tail end of the mounting wall 22. In addition, the object to which the clip of the present invention is attached is not limited to the ball-point pen barrel 2 but may be a writing instrument cap, and the shaft barrel in the present application is in a broad sense including the cap.

  The clip 1 is formed of a synthetic resin, and as shown in FIG. 2, both end portions in the axial direction of the clip body 11 are bent inward to form a pair of bent pieces 12. Locking holes 14 and 14 are formed in the tail end of the. An arc-shaped notch 12b having a radius of curvature equal to or slightly larger than the radius of curvature of the locking hole 14 is formed on the end face of the bent piece 12 immediately above the locking hole 14, and inwardly faces the inner surface including the arc-shaped notch 12b. The inclined surface 12a is formed. Here, the dimension between the outer surfaces of the pair of mounting walls 22 is approximately equal to the dimension between the inner surfaces of the pair of bent pieces 12 of the clip 1, and the inner diameter of the locking hole 14 is approximately equal to the outer diameter of the rotation support shaft 23. ing. Then, the rotation support shaft 23 engages with the locking hole 14, and the clip 1 is attached to the shaft cylinder 2 so as to be rotatable. As shown in FIG. 1, a ball portion 13 is formed at the tip of the bent piece 12 by being formed into an arc shape.

  The tail end of the clip body 11 is formed with an inward first wall 15 and a second wall 16 in a direction orthogonal to the bent piece 12, and the pair of bent pieces 12, 12, the first wall 15 and the first wall 15 A portion defined by the two walls 16 is a spring arrangement space S. Positioning members 17 having a triangular cross section are provided on both sides of the bottom of the spring arrangement space S, and the torsion coil spring 3 arranged in the spring arrangement space S is positioned in a direction perpendicular to the bent piece 12.

  As shown in FIG. 3, the torsion coil spring 3 has action portions 32 and 33 extending in a V shape from both ends of the coil portion 31, and the elastic force is reduced by reducing the angle of the action portions 32 and 33. appear. The tips 32 a and 33 a of the action parts 32 and 33 are bent in parallel with the coil part 31. As described above, the torsion coil spring 3 absorbs the deflection of the entire wire as compared with the plate-like U-shaped spring, and thus is strong in repeated operation and excellent in durability. The action portions 32 and 33 of the torsion coil spring 3 arranged in the spring arrangement space S are in pressure contact with the surfaces of the clip body 11 and the tail crown 21, and the ball portion 13 at the tip is in pressure contact with the surface of the shaft tube 2 by its elastic force. To do. And if the tail end part of the clip 1 is pushed, it can also insert in thick papers, such as a panel which the front end side of the clip 1 expands greatly.

  When assembling the clip, as shown in FIG. 4, first, the torsion coil spring 3 is placed with the inner surface of the clip body 11 facing upward, and the spring placement space S with its action portions 32 and 33 facing toward the tail end. Drop into. Then, as shown in FIG. 5, the mounting wall 22 is pushed between the bent pieces 12, 12. The curvature is equal to or slightly larger than the radius of curvature of the locking hole 14 on the end face of the bent piece immediately above the locking hole 14. An arcuate notch 12b having a radius is formed, and an inwardly inclined surface 12a is formed on the inner surface including the arcuate notch 12b. Even if it is slightly deviated from the push-in position in the axial direction of the clip or in the direction perpendicular to the axial line, it is guided to the arc-shaped notch 12b and the inclined surface 12a to become a normal position, and the rotation support shaft 23 and the locking hole 14 are easily formed. Match. Then, when the push-in is continued, as shown in FIG. 6, the rotation support shaft 23 is easily fitted into the engagement hole 14 so that the clip 1 can be rotated with respect to the shaft cylinder 2, and the assembly is very easy. The work is complete.

It is sectional drawing of this invention Example. (A) is the principal part longitudinal cross-sectional view of a clip, (B) is a cross-sectional view of a clip. (A) is a front view of a torsion coil spring, (B) is a plan view. (A) (B) is explanatory drawing of an assembly process. (A) (B) is explanatory drawing of an assembly process. (A) (B) is explanatory drawing of an assembly process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clip 11 Clip main body 12 Bending piece 12a Inclined surface 12b Arc-shaped notch 13 Ball part 14 Locking hole 15 1st wall 16 2nd wall 17 Positioning member 2 Shaft cylinder 21 Tail crown 22 Mounting wall 23 Turning support shaft 24 Fall-off prevention wall 3 Torsion coil spring 31 Coil part 32 Action part 33 Action part 41 Rotor 42 Presser 43 Refill S Spring arrangement space

Claims (1)

A locking hole is formed on the tail end side of each of the pair of bent pieces obtained by bending both side edges in the axial direction of the clip body inward, and the curvature of the locking hole is formed on the end face of the bent piece immediately above the locking hole. An arc-shaped notch having a radius of curvature equal to or slightly larger than the radius, and an inwardly inclined surface is formed on the inner surface including the arc-shaped notch, and an inner side perpendicular to the bent piece is formed on the tail end side of the clip body. A clip in which the first wall and the second wall are formed, a shaft cylinder in which a rotation support shaft protrudes outward from each of a pair of mounting walls standing in the axial direction on the tail end side, and a torsion A coil spring,
The torsion coil spring is dropped into a spring arrangement space defined by the pair of bent pieces, the first wall, and the second wall with the inside of the clip facing upward, and the rotation support shaft of the shaft tube is moved to the clip. The torsion coil spring is engaged so that the tail end of the clip is separated from the surface of the shaft tube, and the ball part at the tip of the clip is pressed against the surface of the shaft tube. Characteristic clip attachment structure for writing instruments.

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