JP5951220B2 - Intrusive writing instrument - Google Patents

Description

  The present invention relates to a retractable writing instrument having a retracting mechanism that includes a cam groove, a rotating cam, a push rod, and a knock body that protrudes and retracts a writing tip portion of a writing body from a tip opening portion of a shaft cylinder.

  Conventionally, in a retractable writing instrument having a retractable mechanism composed of a knock body, a push rod, a rotating cam, and a cam groove, the writing tip portion of the writing body accommodated in the shaft tube is projected from the tip opening portion of the shaft tube. In order to prevent rattling of the knock body, a coil spring is provided between the rotating cam and the knock body as disclosed in Japanese Utility Model Publication No. 7-2235 “Knock-type writing instrument”. The knocker was urging backwards.

  However, in such a structure, a process for disposing the coil spring is required, and there is a problem that the assembling property and the manufacturing cost are increased. In view of such a problem, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 2003-305990 “Knock-type writing instrument” of the refill accommodated in the shaft tube from the tip opening portion of the shaft tube without providing a coil spring. With the writing tip protruding, it can be determined from the knocked body state (length) whether the writing tip of the writing body is exposed from the tip opening of the shaft tube, and rattling of the knocking body is minimized. A suppressed knock-type writing instrument is disclosed.

  By the way, with respect to the retracting mechanism using the rotating cam, a knocking writing instrument that allows the leading end portion 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, it is necessary to form a sliding groove in the shaft cylinder so that the leg portion of the clip is positioned in this sliding groove.

JP 2008-30410 A JP 2003-305990 A JP 2007-253487 A

  However, in Patent Document 2, since the knock body and the push rod (fixed cam) are fixed, it is necessary to engage the push rod with the cam groove and to arrange the clip at a time. There was a problem that was difficult.

  The present invention has been made in view of these prior arts, and it is an object of the present invention to provide a retractable writing instrument with a simple structure that is easy to assemble and is less likely to cause rattling of the clip when the writing part protrudes.

  In order to solve the above-mentioned problem, the present invention is arranged such that a writing body is repelled rearwardly by a resilient member in the shaft tube and is slidable along a cam groove provided in the rear end portion of the shaft tube. A push rod and a rotating cam are provided, a sliding groove extending in the longitudinal direction is provided at the rear end of the shaft tube, and a leg portion of the clip is slidably provided in the sliding groove. An intrusion mechanism that slides the push rod and the rotating cam by sliding the clip along the moving groove, and causes the writing tip of the writing body to protrude from the tip opening of the shaft tube as the rotating cam rotates. In the retractable writing instrument, a sliding member interlocking with the back and forth movement of the clip is disposed in the shaft tube, and the push rod is moved forward through the sliding member by sliding the clip forward. The rotating cam and the sliding member, and the rotating cam is a sliding portion. The sliding member can be rotated and moved back and forth, and the sliding member is engaged by restricting the forward and backward movement of the rotating cam, and the push rod and the sliding member are connected to each other. And the sliding member is configured to engage with the push rod while restricting the forward and backward movement of the push rod.

  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 are formed corresponding to the sliding grooves.

Furthermore, the leg portion of the clip is pivotally engaged with the sliding member, protrudes to the sliding member on the rear end side of the shaft tube, and is eccentric from the shaft center of the shaft tube. insert the coil spring into a rod projection provided on said mounting a coil spring between the legs of the clip and the sliding member, issued bullet tip portion of the clip on the outer surface of the barrel, the rear end portion of the clip When pressed downward, the tip of the clip opens upward with the connecting portion between the sliding member and the leg of the clip as a fulcrum, and the elastic force of the coil spring is greater than the elastic force of the elastic member. It is small.

  According to the first configuration of the present invention, in the retractable writing instrument, the sliding member that is interlocked with the back-and-forth movement of the clip is disposed in the shaft cylinder, and the sliding is performed by sliding the clip forward. The push rod is slid forward through the member, and the rotating cam and the sliding member can be rotated and moved back and forth with respect to the sliding member, and the sliding member is in front of the rotating cam. The push rod and the sliding member are engaged with the push rod and the sliding member, and the push rod is rotatable with respect to the sliding member, and the sliding member is forward and backward of the push rod. Since the movement is controlled so that the clip does not return to the original position when the writing tip protrudes, it is possible to produce an effect that the clip does not easily rattle.

In addition, since the rotating cam, the push rod, and the sliding member are individually rotatable, it is easy to place the rotating cam and the push rod in the cam groove, and the push rod in the sliding groove. Can be improved.

  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 a plurality of leg portions of the clip are formed corresponding to the sliding grooves. Therefore, it is easy to shorten the distance between the connecting portion and the wall portion, and the connecting portion can be provided on the axial center side of the shaft cylinder of the cylindrical body.

  According to the third configuration of the present invention, the leg portion of the clip is rotatably engaged with the sliding member, protrudes toward the rear end side of the shaft cylinder on the sliding member, and the shaft cylinder. Since the coil spring is inserted into the rod-shaped protrusion provided at a position eccentric to the shaft center of the shaft, even if the rear end of the clip is pressed downward, this pressing force pushes the sliding member toward the tip of the shaft tube It is difficult to convert to a pressing force, and it is possible to suppress accidental protrusion of the writing tip. Moreover, since the elastic force of the coil spring is smaller than the elastic force of the elastic member, the conversion to the pressing force described above can be synergistically suppressed.

  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 having a simple structure that has good assemblability and has a clip in which the connecting portion between the clip and the cylinder is difficult to come off.

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 AA sectional drawing in FIG. It is an external view which shows the sliding member in FIG. It is a top view which abbreviate | omitted the clip in FIG.

  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 6 is configured by screwing the front shaft 2 and the rear shaft 3 to form a shaft body, and the inner wall surface of the rear shaft 3 extends 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. Connection holes 9D that face 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 a convex portion (not shown) provided in the crown 8 is provided in the rear shaft 3. It is inserted through the recess 3C. 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 rod 6, the leg 9C of the clip 9 does not restrict the backward movement by the crown 8 and the rear shaft 3. The backlash of the clip 9 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 7C 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 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 via a chip holder 12. A water-based gel ink having an ink thinning viscosity and an ink follower (not shown) are directly accommodated.

  In the present invention, the rotating cam and the sliding member are configured such that the rotating cam can rotate and move back and forth with respect to the sliding member, and the sliding member regulates the forward and backward movement amount of the rotating cam. Although engaged, the engagement method is not particularly limited. Similarly, if the push rod and the sliding member are engaged with each other if the push rod is rotatable with respect to the sliding member and the sliding member engages by restricting the forward and rearward movement of the push rod. Is not particularly limited. It should be noted that the movement control of the forward / backward movement of the rotating cam is important so that the rotating cam does not interfere with the retracting mechanism. On the other hand, the push rod may be restricted in a state where it does not move back and forth. Although not shown, an attachment portion such as an eraser or a friction member can be integrally or detachably provided on the crown.

The shaft tube of the writing instrument of the present invention is not limited to a ballpoint pen , but can be used for a shaft tube of various writing tools such as a knock-type 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 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 (2)

In the shaft cylinder, a writing body is repelled rearward by a resilient member, and a push rod and a rotating cam that are slidable along a cam groove provided in the rear end portion of the shaft cylinder are disposed. A sliding groove extending in the longitudinal direction is provided at the rear end of the cylinder, the leg of the clip is slidably disposed in the sliding groove, and the clip is slid along the sliding groove. In the retractable writing instrument having a retracting mechanism that slides the push rod and the rotating cam and retracts the writing tip of the writing body from the tip opening of the shaft as the rotating cam rotates. In addition, a sliding member that interlocks with the back and forth movement of the clip is disposed, and by sliding the clip forward, the push rod is slid forward through the sliding member and slides with the rotating cam. The rotating cam is capable of rotating and moving back and forth with respect to the sliding member; and A moving member regulates and engages the forward and backward movement of the rotating cam, and the push rod and the sliding member are configured such that the push rod is rotatable with respect to the sliding member, and the sliding member is is engaged to restrict movement of the front and rear of the push rod, the legs of the clip, Yes engages rotatably the sliding member, the sliding member, the barrel rear end A coil spring is inserted into a rod-shaped protrusion that is protruded to the side and provided at a position eccentric from the axis of the shaft cylinder, and the coil spring is attached between a leg portion of the clip and a sliding member, and the tip of the clip When the rear end of the clip is pressed downward, the tip of the clip opens upward with the connecting portion between the sliding member and the clip leg as a fulcrum. The spring force of the coil spring is smaller than the spring force of the spring member Retractable writing instrument, characterized in that the decoction. 2. A plurality of the sliding grooves are formed at different positions in the circumferential direction, and a plurality of leg portions of the clip are formed corresponding to the sliding grooves. The intrusive writing instrument described in 1.

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