JP2013132837A - Retractable writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retractable writing utensil with a simple structure such that assembling property is excellent and when the writing tip of a writing element is projected or retracted, a clip never falls.SOLUTION: There is provided the retractable writing utensil having a projection mechanism that projects the writing tip of the writing element from the tip opening part of a shaft cylinder as the clip is slid. A slide member operating linked with the forward/backward movement of the clip is arranged in the shaft cylinder and the slide member is provided with an engagement piece part facing the leg part of the clip, side by side, and while an engagement recessed part or engagement projection part provided to leg parts of two clips and an engagement projection part or engagement recessed part provided to the engagement piece part of the slide member are engaged with each other, and at the rear end part of the shaft cylinder, a heat crown is mounted which has an intermediate projection positioned between the leg part of the clip and the engagement piece part of the slide member and on the same circumference of the recess/projection engagement part between the engagement piece part of the slide member and the leg part of the clip.

Description

  The present invention relates to a retractable writing instrument having a feeding mechanism that projects a writing tip portion of a writing body from a tip opening portion of a shaft cylinder by sliding a clip.

  Conventionally, by means of a resilient member disposed between the outer wall surface of the cylinder and the bottom wall surface of the clip, the tip of the clip is always pressed against the outer wall surface of the cylinder, and the rear end of the clip is pressed, A writing instrument having a clip in which the connecting portion between the clip and the cylinder is a fulcrum and the tip of the clip is disposed so as to be separated from the outer wall surface of the shaft cylinder is well known. In a writing instrument having such a clip, Japanese Patent Application Laid-Open No. 9-99690 “Knock-type writing instrument”, Japanese Patent Application Laid-Open No. 2009-6643 “Clip mounting structure”, Japanese Patent Application Laid-Open No. 2005-231148 “Mechanical pencil”, etc. A writing instrument in which a clip is ejected by a resilient member such as a leaf spring is disclosed.

  By the way, with respect to the retracting mechanism using the rotating cam, a knocking writing instrument that allows the writing tip part of the writing body to appear and retract by sliding a clip, such as “writing instrument with seal” in Japanese Patent Application Laid-Open No. 2007-253487, is disclosed. ing. In such a clip slide type retractable writing instrument, a sliding groove is formed in the shaft cylinder, and a leg portion of the clip is positioned in the sliding groove.

JP-A-9-99690 JP 2009-6643 A JP-A-2005-231148 JP 2007-253487 A

  However, in Patent Document 4, etc., if the clip can slide and the writing tip portion of the writing body can be moved in and out, there is a risk that the engaging portion between the clip and the sliding member may be disengaged due to the impact due to the retracting operation, particularly the impact during the immersion. was there. In view of these problems, it is conceivable to integrally form the sliding member and the clip, but new problems such as shape restrictions and assemblability arise.

  The present invention has been made in view of these prior arts, and provides a retractable writing instrument with a simple structure that has good assemblability and does not come off the clip when the writing tip of the writing body protrudes and retracts. It is in.

  In order to solve the above-mentioned problem, the present invention is arranged such that a cursive body is repelled rearwardly by a resilient member in the shaft tube, and a sliding groove extending in the longitudinal direction is provided at the rear end portion of the shaft tube. The two leg portions of the clip provided at different positions in the radial direction and facing the sliding groove are slidably disposed in the sliding groove, and along the sliding groove. A retractable writing instrument having a feeding mechanism that slides the clip to project the writing tip portion of the writing body from the tip opening of the shaft tube, and is linked to the longitudinal movement of the clip in the shaft tube. A sliding member is provided, and an engaging piece portion is provided on the sliding member so as to face the leg portion of the clip, and an engaging concave portion or an engaging convex portion provided on the leg portions of the two clips. And an engaging projection or an engaging recess provided on the engaging piece of the sliding member, At the end, the writing tip is immersed in the tip of the shaft tube, and between the leg of the clip and the engaging piece of the sliding member, and the engaging piece of the sliding member and the leg of the clip And a crown having an intermediate protrusion located on the same circumference of the concave-convex engaging portion.

  Further, the leg portion of the clip is rotatably engaged with the sliding member, and the tip end portion of the clip is attached to the shaft tube by a resilient member disposed between the sliding member and the clip member. It is characterized in that when the rear end of the clip is bounced on the outer surface and the rear end of the clip is pressed downward, the leading end of the clip opens upward with the connecting portion between the sliding member and the leg of the clip as a fulcrum.

  According to the first configuration of the present invention, there is a retractable writing instrument having a feeding mechanism that slides a clip to project the writing tip of the writing body from the tip opening of the shaft, In addition, a sliding member interlocking with the longitudinal movement of the clip is disposed, and an engaging piece portion is provided on the sliding member so as to face the leg portion of the clip, and provided on the leg portions of the two clips. Engaging engagement recesses or engagement protrusions with engagement protrusions or engagement recesses provided on the engagement piece of the sliding member, and at the rear end of the shaft tube, With the writing tip part immersed in the tip part of the shaft tube, the engagement between the leg part of the clip and the engaging piece part of the sliding member and the engaging part of the sliding member and the leg part of the clip Since the head crown with an intermediate protrusion located on the same circumference of the head is attached, Tsu to restrict the movement of the further inner member located inside the flop or sliding member to an effect of suppressing out-of concavo-convex engaging.

  Although the shape of the intermediate protrusion of the head crown is not particularly limited, the clip leg and the engaging piece of the sliding member bend inward, and the clip and the sliding member can be easily engaged with each other. It is preferable to wear the crown after engaging the clip and the sliding member.

  According to the second configuration of the present invention, the clip is resiliently disposed on the outer surface of the shaft cylinder by the resilient member disposed between the sliding member and the clip member, and after the clip. When the end is pressed downward, the clip tip opens upward with the connecting part between the sliding member and the clip leg as a fulcrum, so that a strong clamping force can be obtained and the clip tip opens upward. The distance can be increased.

  In addition, the clip of the present invention is made of a material generally known as a clip for a writing instrument, such as a metal material such as stainless steel, copper alloy, or aluminum, or a resin material such as PC resin, PP resin, or AS resin. What is necessary is just to select suitably.

  The present invention can provide a retractable writing instrument with a simple structure that has good assemblability and does not come off the clip when the writing tip of the writing object protrudes and retracts.

1 is a longitudinal sectional view showing a retractable writing instrument of Example 1. FIG. It is a longitudinal cross-sectional view which shows the state which protruded the writing front-end | tip part in FIG. It is AA sectional drawing which abbreviate | omitted one part in FIG. It is an external view which shows the positional relationship of the sliding member and head crown seen from the clip side.

  Next, examples of the retractable writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

Example 1
The retractable writing instrument 1 according to the first embodiment shown in FIGS. 1 to 4 is configured by screwing a front shaft 2 and a rear shaft 3 to form a shaft body, and the inner wall surface of the rear shaft 3 is along the axial direction. A cam groove (not shown) in which cam grooves (not shown) and shallow cam grooves (not shown) are formed alternately is formed. When the clip 9 is slid to the front shaft 2 side, the rotating cam 5, the push rod 6, and the sliding member 7 are moved to the front shaft 2 side in conjunction with the clip 9, and the retracting mechanism by the rotating cam 5 is operated. The protrusion from the tip opening 4A of the tip member 4 in which the writing tip 13 of the writing body 11 is screwed to the front shaft 2 can be maintained. An outer cylinder 16 is fitted on the front shaft 2.

  Specifically, sliding grooves 3A extending in the longitudinal direction are formed in parallel at different positions in the circumferential direction in the rear portion of the side wall of the rear shaft 3. Further, the clip 9 has a ball portion 9A protruding below the front end portion and a leg portion 9C formed in parallel below the rear end portion. A hole-like engaging recess 9D is formed on both side walls of the leg 9C so as to face each other and pass therethrough.

  The leg portions 9C of the two clips 9 are inserted into the sliding groove 3A from the rear end opening of the rear shaft 3, and the cylindrical protruding engaging projections formed on the two engaging piece portions 7C of the sliding member 7 The engaging recess 9D formed on the leg portion 9C of the clip 9 is fitted into the portion 7D, and the uneven engaging portion R is configured such that the clip 9 is rotatably attached to the sliding member 7. Further, a coil spring 15 is inserted into the rod-like protrusion 7B of the sliding member 7, and this coil spring 15 is attached between the leg portion 9C of the clip 9 and the sliding member 7 with an attachment load (elastic force) of 850 g. By urging the lower side of the leg portion 9C of the clip 9 backward, the tip end portion of the clip 9 is pushed downward around the engaging convex portion 7D of the sliding member 7, and the ball portion 9A of the clip 9 is moved to the rear shaft. 3 is pressed against the surface of 3 and closed.

  Further, the crown 8 is press-fitted and attached to the rear end portion of the rear shaft 3, and the projection of the crown 8 is engaged with the fitting hole provided in the rear shaft 3. Further, the wall surface in the rear shaft 3 is provided with a recess 3C that is open at the rear end of the rear shaft 3 and extends in the longitudinal direction, and a protrusion (not shown) provided on the crown 8 is provided in the rear shaft 3. It is inserted through the recess 3C. Further, the head crown 8 has an intermediate protrusion located between the leg portion 9C of the clip 9 and the engaging piece portion 7C of the sliding member 7 and on the same circumference of the concave and convex engaging portion R of the sliding member 7 and the clip 9. A part 8A is provided.

  Next, the operation of the retracting mechanism will be described in detail. The writing body 11 is press-fitted and held in the rotary cam 5, and the writing tip 13 of the writing body 11 is immersed in the opening 4A of the tip member 4 (FIG. 1. Slide the clip 9 to the front shaft 2 side from FIG. 4-1) (in the direction of arrow F), the sliding member 7 is interlocked with the clip 9 and pushed in conjunction with the sliding member 7. The rod 6 is guided by the protrusion engaged with the cam groove and moves in the direction of the front shaft 2. The rotating cam 5 connected to the push rod 6 is also guided by the cam protrusion engaged with the deep cam groove and moves forward. When the cam projection reaches the tip of the deep cam groove and is detached from the cam groove, the spring receiving member 10 fixed to the top of the concavo-convex portion of the push rod 6 and the rear shaft 3 moves backward by the resilient member 14 made of a coil spring. The urging rotary cam 9 rotates and retracts into the shallow cam groove. Accordingly, the rotary cam 9 and the writing body 11 cannot be further retracted, and the writing tip 13 of the writing body 11 is maintained in a state of protruding from the tip opening 4A of the tip member 4 (FIGS. 2 and 2). 4-2), and when the clip 9 is pressed again in the direction of the front shaft 2, the writing tip portion 13 of the writing body 11 can be immersed in the tip opening portion 4 </ b> A of the tip member 4. It is a haunting mechanism with a rotating cam. The mounting load (elastic force) of the elastic member 14 was 250 g.

  A rod-like protrusion 7A that protrudes forward is provided at the tip of the sliding member 7. The rod-like protrusion 7A includes a tip-side protrusion 7Aa having a larger outer diameter, and an outer side than the tip-side protrusion. The rear end side protrusion 7Ab having a large diameter is provided to be separated in the longitudinal direction.

  Further, an annular protrusion 5B provided on the rotating cam 5 is engaged between the front end side protruding portion 7Aa and the rear end side protruding portion 7Ab of the rod-shaped protrusion 7A of the sliding member 7, and the rotating cam 5 is in contact with the sliding member 7. The rod-shaped protrusion 7Aa of the rod-shaped protrusion 7A of the sliding member 7 is engaged so as to be able to rotate and move back and forth, and the movement of the rotating cam 5 to the front side is restricted, and the rod-shaped protrusion 7A of the sliding member 7 is restricted. The rear end side projection 7Ab regulates the movement of the rotary cam 5 to the rear side. Further, an annular projection provided on the push rod 6 is engaged between the rear end of the rear projection on the rod-like projection 7 A of the sliding member 7 and the wall surface 7 E of the sliding member 7, and the push rod 6 is engaged with the sliding member 7. The rear end protrusion of the rod-shaped protrusion 7A of the sliding member 7 restricts the forward movement of the push rod 6, and the wall surface 7E of the sliding member 7 moves the push rod 6 rearward. Is regulated.

  Therefore, when the writing tip 13 of the writing body 11 protrudes from the tip opening 4A of the tip member 4, the sliding member 7 is formed by the annular protrusion of the rotating cam 5 and the rod-like protrusion 7A tip side protrusion of the sliding member 7. Since the rearward movement of the clip 9 is restricted, rattling of the clip 9 can be suppressed.

  In addition, in a state where the writing tip 13 of the writing body 11 is immersed in the tip opening 4A of the tip member 4, the push rod 6 is restricted from moving backward by the inner step provided in the rear shaft 3. The rearward movement of the sliding member 7 is restricted by the annular protrusion of the rod 6. Therefore, the leg portion 9 </ b> C of the clip 9 can be disposed without restricting the backward movement by the head crown 8, and the backlash of the clip 9 can be suppressed and the head crown 8 can be made difficult to come off.

  Next, the opening / closing operation of the clip 9 will be described. When the rear end portion 9B of the clip 9 is pressed downward from the state in which the ball portion 9A at the front end portion of the clip 9 is closed, the engaging convex portion 7D of the sliding member 7 is pivoted. Thus, the ball 9A at the tip of the clip 9 opens upward and the coil spring 15 is compressed on the lower side of the leg 9C of the clip 9. If the pressing of the rear end portion 9B of the clip 9 is stopped, the ball portion 9A at the tip end portion of the clip 9 is closed by the coil spring 15 and returns to the original state.

  The writing body 11 is a ball-point pen refill, and a writing tip portion 13 holding a ball rotatably is attached to the tip portion of the ink containing cylinder 12 via a chip holder. A water-based gel ink having an ink thinning viscosity and an ink follower (not shown) are directly accommodated.

  In this embodiment, for the sake of convenience, a feeding mechanism using a rotating cam is illustrated, but a feeding mechanism for projecting the writing tip of the writing body from the tip opening of the shaft cylinder by sliding the clip may be provided. For example, it is not limited to a rotating cam. Although not shown, an attachment member such as an eraser or a friction member may be provided integrally or separately on the crown.

  The retractable writing instrument of the present invention is not limited to a ballpoint pen, and can be used for various writing instruments such as a mechanical pencil.

DESCRIPTION OF SYMBOLS 1 Retractable writing instrument 2 Front shaft 3 Rear shaft 3A Sliding groove 3B Inner step 4 Port end member 4A Tip opening 5 Rotating cam 5A Cam projection 5B Annular projection 6 Push rod 6A Projection 6B Annular projection 7 Sliding member 7A Rod-shaped projection 7Aa Front projection 7Ab Rear projection 7B Raised portion 7C Engagement piece portion 7D Engagement projection portion 7E Wall surface 8 Head crown 8A Intermediate projection 9 Clip 9A Ball portion 9B Rear end portion 9C Leg portion 9D Engagement recess portion 11 Writing body 13 Writing tip portion 14 Elastic member 15 Coil spring

Claims (2)

In the shaft cylinder, the cursive body is repelled rearwardly by a resilient member, and two sliding grooves extending in the longitudinal direction are provided in the rear end portion of the shaft cylinder at different positions in the radial direction, The cursive body is formed by slidably disposing leg portions of two clips provided facing the sliding groove in the sliding groove and sliding the clip along the sliding groove. A retractable writing instrument having a feeding mechanism for projecting the writing tip portion from the tip opening portion of the shaft tube, wherein a sliding member interlocking with the longitudinal movement of the clip is disposed in the shaft tube, and the sliding An engaging piece portion is provided on the member so as to face the leg portion of the clip, an engaging concave portion or an engaging convex portion provided on the leg portion of the two clips, and an engaging piece portion of the sliding member The engaging projection or the engaging recess provided on the concave and convex portions is engaged with the concave and convex portions, and the writing tip portion is located in the rear end portion of the shaft tube. In the inserted state, it is located between the leg part of the clip and the engaging piece part of the sliding member and on the same circumference of the concave and convex engaging part of the engaging piece part of the sliding member and the leg part of the clip. A retractable writing instrument characterized by wearing a crown having an intermediate protrusion. A leg portion of the clip is rotatably engaged with the sliding member, and the tip end portion of the clip is disposed on the outer surface of the shaft cylinder by a resilient member disposed between the sliding member and the clip member. When the rear end portion of the clip is pressed downward, the tip end portion of the clip opens upward with the connecting portion between the sliding member and the leg portion of the clip as a fulcrum. A haunting writing instrument.

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