JP5951221B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument having a feeding mechanism that allows a writing tip portion of a writing body to protrude from a tip opening portion of a shaft tube by sliding a clip disposed on the shaft tube.

  Conventionally, a writing instrument having a crown attached to the rear end of the shaft tube is well known. In such a writing instrument, as disclosed in Japanese Utility Model Laid-Open No. 56-160888, "Clip device for writing instrument", it is common to press-fit the tail plug into the rear end portion of the shaft cylinder.

  Further, a writing instrument having a feeding mechanism that allows a writing tip portion of a writing body to protrude from a tip opening portion of the shaft tube by sliding a clip disposed on the shaft tube is well known. No. "Knock type writing instrument" and the like.

Japanese Utility Model Publication No. 56-160888 Japanese Utility Model Publication No. 4-79688

  However, in Patent Document 2, as in Patent Document 1, if the head crown is press-fitted to the rear end portion of the shaft tube, the inner diameter of the rear end portion of the shaft tube may increase, which may hinder the retracting mechanism. It was. In view of these problems, if the amount of lap to be press-fitted is reduced, there is a problem that the crown is likely to come off.

  Further, in the structure in which the leg portion of the clip is slidably disposed in the sliding groove as in Patent Document 2, the groove width of the sliding groove may change over time, and the groove width is particularly narrow. And there was a problem affecting the infestation operation.

  The present invention has been made in view of these conventional techniques, and provides a writing instrument having a simple structure with a crown attached to the rear end portion of the shaft cylinder, which has good assemblability and can be stably operated. There is to do.

  In order to solve the above-described problem, the present invention provides a writing instrument having a retracting mechanism that allows a writing tip portion of a writing body to protrude from a tip opening portion of a shaft tube by sliding a clip disposed on the shaft tube. A plurality of sliding grooves extending in the longitudinal direction and opening the rear end at different positions in the circumferential direction at the rear end portion of the shaft tube, and the leg portions of the clips corresponding to the sliding grooves, The sliding groove is slidably disposed, and the engaging portion provided on the crown is engaged with the engaged portion provided on the sliding groove at the rear end portion of the shaft tube. It is characterized by that.

  Further, a plurality of the sliding grooves are formed at different positions in the circumferential direction, and a plurality of leg portions of the clip and engaging portions of the crown are formed corresponding to the sliding grooves. It is characterized by being.

  According to the first configuration of the present invention, in the writing instrument having a retracting mechanism that allows the writing tip portion of the writing body to protrude from the tip opening portion of the shaft tube by sliding the clip disposed on the shaft tube, A plurality of sliding grooves extending in the longitudinal direction and opening the rear end are formed at different positions in the circumferential direction at the rear end portion of the shaft tube, and the leg portions of the clips corresponding to the sliding grooves are The sliding groove is slidably disposed, and the engaging portion provided on the crown is engaged with the engaged portion provided on the sliding groove at the rear end portion of the shaft tube. Therefore, it is possible to suppress a decrease in the groove width of the sliding groove with time, and to obtain a stable intrusion operation by the leg portion of the clip.

  According to the second configuration of the present invention, a plurality of the sliding grooves are formed at different positions in the circumferential direction, and the leg portion of the clip and the engaging portion of the head crown are formed in the sliding groove. Correspondingly, a plurality of clips are formed, so that the slide of the clip can be stabilized and rotation of the crown can be effectively suppressed to prevent the crown from coming off.

  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 writing instrument with a simple structure, which has a good assemblability and can provide a stable intrusion operation, with a crown attached to the rear end of the shaft cylinder.

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 a principal part expanded sectional view in which a part was omitted in FIG. It is a top view which abbreviate | omitted the clip in FIG. It is AA sectional drawing in FIG.

  Next, examples of the shaft cylinder of the 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 writing instrument 1 according to the first embodiment shown in FIGS. 1 to 5 is configured by screwing the front shaft 2 and the rear shaft 3 to form a shaft cylinder body, and extends along the axial direction on the inner wall surface of the rear shaft 2. A cam groove (not shown) is formed by alternately forming a cam groove (not shown) having a large depth and a shallow cam groove (not shown). 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. Connection holes 9D facing each other are formed in both side wall portions of the leg portion 9C.

  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 leg portions of the clip 9 are inserted into the cylindrical raised portions 7C formed on the two pieces of the sliding member 7. The connecting hole 9D formed in 9C is fitted, and the raised portion 7C is connected to the connecting hole 9D so as to be rotatable. 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 with the raised portion 7C of the sliding member 7 as an axis, and the ball portion 9A of the clip 9 is Pressed against the surface and closed.

  Further, the sliding groove 3A extends with the rear end of the rear shaft 3 opened, and a protrusion 8A provided in parallel with the head crown 8 is inserted from the opening at the rear end of the rear shaft 3 to thereby slide the sliding groove 3A. A projection 3Aa for reducing the window width provided on the vehicle is mounted by fitting over it. Further, the wall surface in the rear shaft 3 is provided with a concave portion 3C that is open at the rear end of the rear shaft 3 and extends in the longitudinal direction, and the convex portion 8B provided on the crown 8 is inserted into the concave portion 3C in the rear shaft 3. It is. The sliding groove 3A and the crown 8 are engaged so as to be substantially flush with each other.

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 clip from the state where the writing tip 13 of the writing body 11 is inserted into the opening 4 </ b> A of the tip member 4. By sliding 9 to the front shaft 2 side, the sliding member 7 is interlocked with the clip 9, and the push bar 6 is guided to the protrusion 6A engaged with the cam groove in conjunction with the sliding member 7. To move in the direction of the front axis 2. The rotating cam 5 connected to the push rod 6 is also guided by the cam protrusion 5A engaged with the deep cam groove and moves forward. When the cam projection 5A reaches the tip of the deep cam groove and is detached from the cam groove, the spring receiving member 10 fixed in the top of the uneven portion of the push rod 6 and the rear shaft 3 causes the elastic member 14 made of a coil spring to move backward. The rotating cam 5 urged toward the side rotates and retracts into the shallow cam groove. Accordingly, the rotating cam 5 and the writing body 11 cannot be further retracted, and the writing tip portion 13 of the writing body 11 can be maintained in a state of protruding from the tip opening portion 4A of the tip member 4, and again. When the clip 9 is pressed in the direction of the front shaft 2, the writing tip 11 of the writing body 11 can be sunk into the tip opening 4A of the tip member 4, which is a conventionally known retracting mechanism using 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 has a tip-side protrusion 7Aa having a larger outer diameter and a tip-side protrusion 7Aa. The rear end protrusion 7Bb having a large outer diameter is provided apart 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 6B provided on the push rod 6 is engaged between the rear end side projection 7Ab rear of the rod-like projection 7A of the sliding member 7 and the wall surface 7D of the sliding member 7, and the push rod 6 is engaged with the sliding member. 7, the rear end protrusion 7Ab of the rod-shaped protrusion 7A of the sliding member 7 restricts the forward movement of the push rod 6, and the wall surface 7D of the sliding member 7 is behind the push rod 6. The movement to 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 protrusion 7Aa of the rod-like protrusion 7Aa of the rod-like protrusion 7A of the sliding member 7 slides with the annular protrusion 5B of the rotating cam 5. Since the movement of the moving member 7 to the rear is restricted, rattling of the clip 9 can be suppressed.

  When 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 inward protrusion 3B provided in the rear shaft 3. Since the rearward movement of the sliding member 7 is restricted by the annular protrusion 6B of the push bar 6, the leg portion 9C of the clip 9 is not in contact with the crown 8 and the rear shaft 3. Can be suppressed, and the crown 8 can be prevented from coming 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 protruding portion B of the sliding member 7 is used as an axis. The ball portion 9A at the tip of the clip 9 opens upward and the coil spring 15 is compressed on the lower side of the leg portion 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 ballpoint pen refill, and a writing tip portion 13 in which a ball is rotatably held at the tip portion of the ink storage cylinder is mounted via a chip holder 12, and inside the ink storage cylinder, A water-based gel ink having black shear thinning and an ink follower (not shown) are directly accommodated.

  In this embodiment, the intrusion mechanism by the rotating cam is illustrated, but the intrusion mechanism is not particularly limited as long as it can slide the clip and project the writing tip of the writing body. . Although not shown, an attachment portion such as an eraser or a friction member can be integrally or detachably provided on the crown.

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

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Front shaft 3 Rear shaft 3A Sliding groove 3Aa Protruding part 3B Inner step part 4 Portion member 4A Tip opening part 5 Rotating cam 5A Cam protrusion 5B Annular protrusion 6 Push rod 6A Protrusion 6B Annular protrusion 7 Sliding member 7Aa Front projection 7Ab Rear projection 7B Raised portion 7C Engagement portion 7D Wall surface 8 Head crown 8A Projection 9 Clip 9A Ball portion 9B Rear end portion 9C Leg portion 9D Connection hole 11 Writing body 13 Writing tip portion 14 Elastic member 15 Coil spring

Claims (1)

In a writing instrument having a retracting mechanism that allows the writing tip of the writing body to protrude from the tip opening of the shaft tube by sliding a clip disposed on the shaft tube, a longitudinal direction is provided at the rear end of the shaft tube. A sliding groove having an opening at the rear end is formed, a leg portion of a clip is slidably disposed in the sliding groove, and the rear end portion of the shaft cylinder is The engaged portion provided in the sliding groove is engaged with the engaging portion provided in the crown, and the crown is attached , and a plurality of the sliding grooves are formed at different positions in the circumferential direction. A writing instrument in which a plurality of leg portions of the clip and engaging portions of the crown are formed corresponding to the sliding grooves .

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