JP2010214916A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a writing utensil in which an operation body allotted to the rear end of a shaft cylinder is operated to make a writing tip of a writing body advance and project to be maintained from the tip opening of the shaft cylinder, and the writing tip of the writing body is absorbed in the tip opening of the shaft cylinder through a shock to the shaft cylinder at time of placing the writing utensil on a desktop or the like. <P>SOLUTION: A body to be pinched holding chamber 16 which is composed of a front side wall member 11 and a rear side wall member 14 is formed into a shaft cylinder 2 to hold a body to be pinched 17. A recessed part 26 for the body to be pinched to which the body to be pinched 17 can be engaged is formed at the part of a hole 25 for a pinching rod in which a pinching rod 24 is inserted which is prepared in the backward end face 11b of the front side wall member 11. A writing tip 21b of a writing body 21 is projected from the tip opening 28 of the shaft cylinder 2 by operating an operation body 5, the body to be pinched 17 is engaged with the recessed part 26 for the body to be pinched, the body to be pinched 17 is pinched by the pinching rod 24 and the rear side wall member 14, and thereby the projection condition of the writing tip 21b is maintained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention advances the operation body arranged at the rear end portion of the shaft tube, so that the writing tip portion of the writing body protrudes from the tip opening portion of the shaft tube, and the writing tool is placed on the desk. The present invention relates to a writing instrument provided with an automatic return mechanism for immersing a writing tip of a writing body into a tip opening of a shaft cylinder by impact or the like.

  Conventionally, the writing body connected to the knock operation part provided on the shaft cylinder is automatically knocked when the writing tip part of the writing body protrudes from the tip opening part of the shaft cylinder by the knocking operation, and the writing instrument is placed sideways. Japanese Patent Application Laid-Open No. 2007-15239 proposes a writing instrument provided with an automatic return mechanism in which a part is immersed in the tip opening of the shaft cylinder.

  In the “ballpoint pen” described in the above publication, (a) the automatic return mechanism includes a working shaft 10 having an engaging portion 12 that engages and disengages with the knocker 4 and a bendable portion provided at the rear end of the working shaft 10. A joint member 6 and a weight member 8 connected to the joint member 6; (b) when the knocker 4 is pushed down to cause the tip of the writing body 2 to protrude from the tip of the writing instrument main body 1, the knocker 4 10 is engaged with the engaging portion 12 and pushes down the operating shaft 10, and the upper surface of the locking projection 15 formed on the knocker 4 comes into contact with the bottom surface of the guide tube 9, and (c) tilts the writing instrument body 1. When the weight member 8 is tilted, the operating shaft 10 is lifted, and the engaging portion 12 of the operating shaft 10 releases the contact of the upper surface of the locking projection 15 with the bottom surface of the guide tube 9. It is.

  The projecting and retracting mechanism for projecting and retracting the writing tip of the writing body from the opening of the tip end of the shaft by the knocking operation of the above technique attaches a slide piece (knocker 4) having a protruding part to the rear end of each writing object. Projecting outward from the sliding groove formed at the rear end of the shaft cylinder, and the curling unit is advanced by advancing the protruding portion toward the tip of the shaft cylinder, and the latch formed on the slide piece (knocker 4) This is called a “sliding type” in which the front end portion of the writing body is projected from the front end opening of the shaft cylinder by locking the portion to the locked portion formed at the rear end portion of the shaft cylinder. Therefore, an automatic return mechanism is attached to the rear end of the shaft cylinder. In the retracting mechanism that protrudes the writing tip of the writing body from the tip opening of the shaft cylinder by pushing or rotating the operation body partly protruding outward from the rear end opening of the shaft cylinder to advance, It is difficult to adopt.

  Further, as described above, when the writing instrument body 1 is tilted, the weight member 8 is tilted to lift the operating shaft 10, and the engaging portion 12 of the operating shaft 10 and the upper surface of the locking convex portion 15 are the guide cylinder. In the structure that releases the contact with the bottom surface of 9, it is very normal to write by tilting the writing instrument body at the time of writing, and to lift the operating shaft 10 when tilted from the time of writing. When the weight member 8 is further tilted, the operating shaft 10 needs to be lifted, and the accommodating portion 7 for accommodating the weight member 8 requires a large volume, which causes a problem that the design is restricted.

JP 2007-15239 A

  The present invention operates the operating body arranged at the rear end portion of the shaft tube to advance, and the writing tip portion of the writing body protrudes from the tip opening portion of the shaft tube to maintain the protruding state, and the writing instrument is moved to a desk or the like. Obtain a writing instrument with an automatic return mechanism that can adopt a design comparable to existing writing instruments that immerse the writing tip of the writing body into the tip opening of the cylinder by impact on the cylinder when placed For the purpose.

The present invention
“1. An operating body is arranged at the rear end of the shaft cylinder so as to be movable back and forth, and a front side wall portion and a rear side provided in the shaft cylinder in front of the operating body so as not to move in the shaft cylinder. A sandwiched body accommodating chamber partitioned by the side wall portion is formed to accommodate the sandwiched body, and the cursive body is accommodated in the shaft cylinder in front of the front side wall portion by being urged backward by a spring so as to be movable back and forth. And, at the rear end portion of the cursive body, a holder member having a sandwiching bar portion that penetrates the front side wall portion and protrudes into the sandwiched body accommodation chamber and is movable back and forth with respect to the front side wall portion,
Connected to the operating body is a holder push rod body that can move back and forth in conjunction with the movement of the operating body, and that passes through the front and rear side wall portions and whose front end abuts or is connected to the rear end surface of the holder member. Alternatively, the front end opening portion of the shaft tube is provided at a portion of the hole for the holding rod portion formed in the front side wall portion through which the holding rod portion on the rear end surface facing the holding body accommodating chamber of the front side wall portion is provided. The holder push bar is moved forward in the shaft cylinder by providing a recessed portion for the clamped body that can be engaged with the clamped body when the shaft cylinder is gripped toward the side, and operating the operating body to advance the operating body. The holder member is pressed to cause the writing tip of the writing body to protrude from the tip opening of the shaft tube, and the holding member is held between the holding rod portion and the rear side wall portion of the holder member, thereby Writing instrument that maintains the protruding state of.
2. In the movement of the sandwiched body that extends in the axial radial direction toward the sandwiched body recess, on the rear end surface facing the sandwiched body accommodation chamber of the front side wall portion, the sandwiched body is moved to the sandwiched body recess. 2. The writing instrument according to 1 above, wherein a guide groove is provided for guiding.
3. The holding rod portion is provided at a position biased in the vicinity of the inner wall surface side of the shaft tube on the rear end surface of the holder member, and at least a rear end surface facing the sandwiched body accommodation chamber on the front side wall portion is provided at the front end opening of the shaft tube. Provided with an inclination in the axial direction of the shaft cylinder so that the clamped body moves to the position where the clamping rod section is disposed in the clamped body accommodating chamber when the shaft cylinder is gripped with the portion facing downward 3. The writing instrument as described in 1 or 2 above, wherein "
It is.

  In the writing instrument according to the present invention, when the operating body is operated and advanced, the holder push rod moves forward in the shaft cylinder to press the holder member, and the writing tip of the writing body projects from the tip opening of the shaft cylinder. In addition, the tip of the holding rod portion formed on the holder member is immersed in the front side wall portion from the sandwiched body accommodation chamber, and the sandwiched body is moved to a position facing the tip of the sandwiching rod portion in the sandwiched body accommodation chamber. Thus, the protruding tip portion is maintained in a protruding state by being sandwiched between the sandwiching rod portion and the rear side wall portion constituting the sandwiched body accommodation chamber. In order for the sandwiching bar portion to sandwich the object to be sandwiched, it is necessary to move the sandwiching rod portion forward and then retract, and the holder member must move backward. To do this, the holder push rod must be retracted. To retract the holder push rod, the operating tool must be retracted, but when the operation of the operating tool is stopped, the operating tool automatically moves backward. If a simple structure is used, the operability will be good. Note that the operation body includes a knock body that moves back and forth by a pressing operation, and a structure that moves back and forth by a turning operation.

  In order to automatically move the operating body backward when the operation to the operating body is stopped, a spring is arranged on the operating body and the operating body is urged directly backward, or the writing body is moved backward. There is a method of indirectly biasing the operating body backward using a biasing force to bias. In order to move the operating body back and forth by a turning operation, a spiral groove is formed at the rear end portion of the shaft tube, an engaging projection that engages with the spiral groove is provided on the operating body, and the engaging projection is The operating body may be arranged by engaging with the spiral groove. However, in order to automatically retract the operating body backward when the pressing or rotating operation on the operating body is stopped, the spiral in the spiral groove is used. A spiral groove with a long pitch is required.

  The sandwiched body in the present invention is not limited in shape, size, material, etc., and may be a sphere, a cube, a rectangular parallelepiped, a cylindrical body, or a deformed body as long as it is movable in the sandwiched body accommodation chamber. . However, it is important to make the shape and size so that the sandwiched body is sandwiched between the sandwiching rod portion and the rear side wall portion, and the writing tip portion projects from the tip opening portion of the shaft tube. It is. A preferable shape is a polyhedron having a circular sphere or a substantially spherical shape. However, with regard to the weight, there is a relationship with the clamping force when the clamped body is clamped between the clamp rod portion and the rear side wall portion, but at least the clamped body is held by its own weight with the clamping rod portion and the rear sidewall portion. It is important to set the weight so that it does not come off the pinch.

  In the present invention, the holding rod portion may be formed integrally with the holder member, or may be formed as a separate member and fixed to the holder member. There are no particular restrictions on the shape and size of the sandwiching rod portion, and the cross section may be a polygonal or circular rod-shaped body or a pipe shape. The important thing is that the sandwiching rod portion is sandwiched by the sandwiched rod portion. By pressing the body against the rear side wall portion, it is necessary to securely hold the body between the holding rod portion and the rear side wall portion, and it is necessary to provide the to-be-held body so that it can be detached from the above-mentioned holding by impact on the shaft tube.

  The holder push rod body in the present invention is not particularly limited in shape and size, but is disposed at a position that does not hinder the movement of the sandwiched body accommodated in the sandwiched body accommodation chamber in the axial diameter direction. It is important to have a size.

  In the present invention, the length of the front side wall portion in the axial center direction is such that when the operating body advances by the operation of the operating body and the writing tip of the writing body protrudes from the tip opening of the shaft tube, the holder member is also written. Since the head moves forward in conjunction with the body and the sandwiching rod portion also moves in conjunction with the body, a length is required so that the rear end of the sandwiching rod portion does not come out of the front side wall portion.

  The shape and size of the sandwiched body recessed portion with which the sandwiched body is engaged in the present invention is such that the sandwiched body engages without shaking when the writing tool is gripped with the writing tip facing downward. It sets suitably according to the shape of a to-be-clamped body.

  The guide groove in the present invention is not particularly limited in terms of shape and size, and may be provided so that the sandwiched body is surely moved to a position opposed to the pin for the sandwiching rod formed in the front side wall. . When the sandwiched body is a rectangular parallelepiped or a deformed body, if the sandwiched body is freely movable in the sandwiched body receiving chamber, the sandwiched body may not always contact the guide groove in the same direction and the same state. Therefore, the separation distance between the front side wall and the rear side wall may be set so that the sandwiched body is not separated from the guide groove.

  Since the present invention has a structure as described above, an operation body arranged at the rear end portion of the shaft cylinder is operated, so that the object to be sandwiched is composed of the sandwiching bar part of the holder member and the rear side wall part constituting the sandwiched body accommodation chamber. By holding, the writing tip of the writing body is maintained in a protruding state protruding from the tip opening of the shaft cylinder, and the object to be clamped is released from the clamping by the impact on the shaft cylinder when the writing instrument is placed on a desk or the like. As a result, it was possible to obtain a writing instrument having an automatic return mechanism for immersing the writing tip of the writing body into the tip opening of the shaft tube, and having a silhouette equivalent to that of an existing writing instrument without impairing the design.

  In the present invention, when the writing tip portion of the writing body is projected from the tip opening portion of the shaft tube, the sandwiched body needs to be sandwiched between the sandwiching rod portion and the rear side wall portion. Since it engages with the body recess without rattling and faces the sandwiching rod portion, the sandwiched body can be securely sandwiched between the sandwiching rod portion and the rear side wall portion, and operability is good.

  Further, in the writing instrument of the present invention, the pressing force to the sandwiched body of the sandwiching rod portion for sandwiching and holding with the rear side wall portion, that is, the urging force of the spring biasing the writing body backward and When the writing instrument is tilted horizontally by adjusting the weight of the sandwiching body, the weight of the sandwiched body surpasses the pressing force of the sandwiching rod part, and the sandwiched body is released from the sandwiching between the sandwiching rod part and the rear side wall part. It is also possible to automatically release the protruding state of the writing tip portion from the tip opening portion of the shaft tube and to make the writing tool capable of immersing the writing tip portion into the tip opening portion of the shaft tube.

  With the invention according to claim 2, since the sandwiched body is guided by the guide groove and can be smoothly engaged with the recessed portion for the sandwiched body, the operability can be further improved.

  With the invention according to claim 3, with the front end opening of the shaft cylinder facing downward, the operating body is operated to hold the sandwiched body between the sandwiching rod and the rear side wall in the sandwiched body receiving chamber. In this case, the sandwiched body automatically moves by gravity to the position where the sandwiching bar portion is disposed in the sandwiched body accommodation chamber, so that the sandwiched body can be easily sandwiched between the sandwiching rod portion and the rear side wall portion, and operability is improved. Can be further improved.

It is a longitudinal cross-sectional view of the writing instrument which shows the 1st Example of the writing instrument which concerns on this invention. The front side wall member in FIG. 1 is shown, (a) is an enlarged side view of a front side wall member, (b) is an enlarged view which shows the back end surface of a front side wall member. It is an expansion perspective view which shows the front side wall member in FIG. The rear side wall member in FIG. 1 is shown, (a) is an enlarged view which shows the front end surface of a rear side wall member, (b) is an enlarged side view of a rear side wall member. In the writing instrument of the first embodiment, the operating body is pressed to advance, the writing tip of the writing body protrudes from the tip opening of the shaft tube, and the holding rod also advances to immerse the tip into the front side wall member. It is a longitudinal cross-sectional view of a writing instrument which shows the state which was made. FIG. 5 is a longitudinal sectional view of the writing instrument showing a state in which the sandwiched body is moved to a position where the sandwiching rod portion is disposed in the sandwiched body accommodation chamber and engaged with the sandwiched body recess formed in the front side wall member. is there. In the state of FIG. 6, the operation body is slightly retracted by slightly reducing the pressing force to the operation body, and shows a state in which the sandwiched body is sandwiched between the sandwiching bar portion and the rear side wall portion constituting the sandwiched body accommodation chamber. It is a longitudinal cross-sectional view of a writing instrument. It is a longitudinal cross-sectional view of a writing instrument which shows the state which maintained the writing front-end | tip part of the writing body protruding from the front-end | tip opening part of a shaft cylinder in the writing instrument of 1st Example. It is a longitudinal cross-sectional view of the writing instrument which shows the 2nd Example of the writing instrument of this invention. FIG. 10 is an enlarged perspective view of the front side wall member in FIG. 9. FIG. 10 is an enlarged perspective view of a rear side wall member in FIG. 9. In the writing instrument of 2nd Example, it is a longitudinal cross-sectional view of a writing instrument which shows the initial state which the operation body was pushed and rotated and advanced, and the front-end | tip of a holder push rod contact | abutted the rear-end surface of the holder member. In FIG. 12, the operating body is further pushed and rotated to advance, the writing tip of the writing body protrudes from the tip opening of the shaft tube, and the holding rod also advances to immerse the tip into the front side wall member. It is a longitudinal cross-sectional view of the writing instrument which cut | disconnected the part of the principal part which shows. In FIG. 13, the to-be-clamped body is moved to the position where the clamping rod portion of the to-be-clamped body accommodation chamber is arranged, and is a longitudinal sectional view of the writing instrument showing a state in which the to-be-clamped body is engaged It is. In the state of FIG. 14, the operation body is slightly retracted by slightly reducing the pressing force on the operation body, and the sandwiched body is sandwiched between the sandwiching bar portion and the rear side wall portion constituting the sandwiched body accommodation chamber. It is a longitudinal cross-sectional view of the writing instrument which cut the part of the principal part. It is a longitudinal cross-sectional view of the writing instrument which shows the state which maintained the writing tip part of the writing body in the writing instrument of 2nd Example which protruded from the front-end | tip opening part of the axial cylinder.

  The writing instrument of the present invention has a sandwiched body interposed between the operation body and the writing body, thereby advancing the writing body by the length in the axial direction of the portion where the sandwiched body is sandwiched. The writing tip is projected from the tip opening of the shaft tube and maintained in this state, and the sandwiched body is separated from between the operating body and the writing body by impact to the shaft tube, etc. Is structured to be immersed in the opening at the tip of the shaft cylinder.

  Embodiments of the writing instrument of the present invention will be described with reference to the drawings. Although the clip is not illustrated in the present embodiment, it is omitted for the sake of convenience, and the present invention is not limited to a writing instrument having a structure without a clip.

  In the writing instrument 1 of the first embodiment shown in FIGS. 1 to 4, the shaft cylinder 2 is constituted by a cylindrical shaft portion 3 and a tapered tip portion 4. On the rear end 3a (right side in FIG. 1) of the shaft part 3, an operating body constituted by a front part 5a having a small outer diameter and a rear part 5b having an outer diameter larger than the outer diameter of the front part 5a. 5 is arranged such that a part of the rear part 5 b protrudes outward from the rear end opening part 3 b of the shaft part 3.

  On the inner wall surface of the rear end portion 3 a of the shaft portion 3, a ring-shaped inward projecting portion 6 projecting inwardly so that the front portion 5 a of the operation body 5 can be loosely fitted is provided. The tip of 5a is loosely fitted. At the front end (left side in FIG. 1) of the operation body 5, a holder push rod body 7 composed of a cylindrical fixing portion 7a and a push rod portion 7b projecting forward (left side in FIG. 1) is projected inwardly. The female screw portion 9 formed on the fixing portion 7a is screwed into the male screw portion 8 formed at the front end of the front portion 5a of the operating body 5 and fixed with an adhesive. The operation body 5 is connected. The holder push rod body 7 can be moved back and forth in conjunction with the operation body 5. The operation body 5 is configured so that the fixing portion 7 a of the holder push rod body 7 does not come out of the rear end opening portion 3 b of the shaft portion 3 by coming into contact with the inward protruding portion 6. In this embodiment, a spring 10 is stretched between the inward projecting portion 6 of the shaft portion 3 and the rear portion 5b of the operating body 5 to bias the operating body 5 backward.

  A cylindrical front side wall member 11 as shown in FIG. 2 is moved inside the shaft portion 3 inside the shaft portion 3 in front of the fixing portion 7a of the holder push rod body 7 (leftward in FIG. 1). The pin 12 driven into the shaft portion 3 is fixed to the shaft portion 3 by being inserted into the through hole 13 provided in the side portion 11a of the front side wall member 11 so as not to be present. Further, a cylindrical rear side wall member as shown in FIG. 3 is provided inside the shaft portion 3 at a position behind the front side wall member 11 (rightward in FIG. 1) and in front of the fixing portion 7a of the holder push rod body 7. As in the case of the front side wall member 11, the pin 12 driven into the shaft part 3 is inserted into the through hole 15 provided in the side part 14 a of the rear side wall member 14 so as not to move in the shaft part 3. By being inserted, it is fixed to the shaft portion 3.

  A sandwiched body accommodating chamber 16 partitioned by the front side wall member 11 and the rear side wall member 14 accommodates a spherical sandwiched body 17 and is behind the front side wall member 11 constituting the sandwiched body accommodating chamber 16. The end surface 11b and the front end surface 14b of the rear side wall member 14 are provided so as to be inclined so that the upper side in FIG.

  Further, lower end portions 11c and 14c of the front side wall member 11 and the rear side wall member 14 that are close to the operating body 5 side where the rear end surface 11b and the front end surface 14b are inclined (in FIG. 1, the inner wall side below the shaft portion 3). 2 or 3 is provided with concave grooves 18 and 19, and the push rod portion 7 b of the holder push rod body 7 connected to the operation body 5 is loosely fitted.

  In the shaft cylinder 2 in front of the front side wall member 11, a writing body 21 is accommodated so as to be movable back and forth and urged rearward by a spring 20, and a holder 21 is mounted on the rear end portion 21a of the writing body 21. The member 22 is inserted into the fitting groove 23 provided in the holder member 22 by fitting the rear end portion 21 a of the writing body 21.

  On the rear end surface 22a of the holder member 22, a clamping rod portion 24 protruding rearward (rightward in FIG. 1) is positioned at the upper end portion (on the opposite side of the concave groove 18 formed in the front side wall member 11). 1 in the vicinity of the upper wall surface end). As shown in FIG. 3, the front side wall member 11 has an upper end portion (upper end portion in FIG. 2) opposite to the lower end portion 11 c where the concave groove 18 is formed at a position facing the holding rod portion 24. A penetrating pin portion hole 25 penetrating therethrough is formed, and the pinching rod portion 24 projects through the pinching rod portion hole 25 into the clamped body accommodation chamber 16.

  As shown in FIG. 2 and FIG. 3, a pin 25 is provided in the rear end surface 11 b of the front side wall member at a position of the pin 25 for the pin to insert the pin 24. In addition, a sandwiched body recess 26 is provided in which the sandwiched body 17 can be engaged without rattling. Further, when the writing instrument 1 is gripped with the tip opening 28 of the shaft tube 2 extending downward in the axial diameter direction communicating with the recessed portion 26 for the sandwiched body, A guide groove 27 having a substantially semicircular cross section is provided to guide the movement of the sandwiched body 17.

  Next, the operation will be described with reference to FIGS. 5 to 8. First, when the operating body 5 is pressed and advanced, as shown in FIG. 5, as shown in FIG. 5, the holder push rod body 7 connected to the operating body 5. Forward, the tip of the push bar portion 7b of the holder push bar 7 abuts against the rear end surface 22a of the holder member 22 to press the holder member 22, and the holder member 22 also moves forward. As a result, the tip of the holding rod portion 24 of the holder member 22 is immersed in the pin 25 for the holding rod portion provided in the front side wall member 11, and the writing tip portion 21 b of the writing body 21 is from the tip opening portion 28 of the shaft tube 2. Protruding.

  At this time, when the shaft cylinder 2 is stood so that the tip opening 28 of the shaft cylinder 2 faces downward, as shown in FIG. 6 (for convenience, the shaft cylinder 2 is drawn in a horizontal state), the front side wall is shown. Since the rear end surface 11b of the member 11 and the front end surface 14b of the rear side wall member 14 are inclined, the sandwiched body 17 is provided with the sandwiching rod portion 24 in the sandwiched body accommodating chamber 16 along the guide groove 27. It moves to the position side and engages with the sandwiched body recess 26 without rattling, and the sandwiched body 17 faces the sandwiching bar portion 24.

  In this state, when the pressing force to the operating body 5 is slightly relaxed, the operating body 5 is slightly retracted by the urging force of the spring 10, and the writing body 21 and the holder member 22 are also retracted as shown in FIG. The tip of the portion 24 protrudes into the sandwiched body accommodating chamber 16, and the sandwiched body 17 is pressed against the front end surface 14 b of the rear side wall member 14 by the sandwiching rod portion 24, so that the sandwiched body 17 is moved to the sandwiched body recess 26. And is sandwiched between the sandwiching bar portion 24 and the rear side wall member 14.

  When the pressing to the operating body 5 is stopped, as shown in FIG. 8, the operating body 5 returns to the original position by the biasing force of the spring 10, but the clamping rod portion 24 is a spring that biases the writing body 21 backward. 20, the holder member 22 is pressed rearward through the writing body 21, so that the sandwiched body 17 continues to be sandwiched between the sandwiching rod portion 24 and the rear side wall member 14, and the shaft of the writing leading end portion 21 b of the writing body 21. The protruding state from the tip opening 28 of the cylinder 2 is maintained.

  The pressing force of the clamping bar 24 to the clamped body 17 by the spring 20 that biases the writing body 21 backward is 12 gf, and the portion where the tip of the clamping bar 24 abuts on the clamped body 17 is the portion of the clamped body 17. Since it is slightly shifted from the center (position shifted by about 0.05 mm in the front-rear direction), the sandwiched body 17 is held by the sandwiching rod portion 24 by a slight impact when the writing instrument 1 of this embodiment is placed on a desk or the like. The writing tip 21 b of the writing body 21 is immersed in the tip opening 28 of the shaft cylinder 2.

  The writing instrument 51 of the second embodiment of the invention according to claim 1 shown in FIGS. 9 to 11 does not show a clip in this embodiment, as with the writing instrument 1 of the first embodiment, but is omitted for convenience. It is a thing. In addition, when showing the same member and the same location as the writing instrument 1 of 1st Example, the same code | symbol is attached | subjected.

  In the writing instrument 51 of the second embodiment, the shaft cylinder 2 is composed of a cylindrical shaft portion 3 and a tapered tip portion 4 as in the writing instrument 1 of the first embodiment. A spiral groove 52 is formed on the inner wall surface behind the shaft 3 (rightward in FIG. 9). Inside the shaft portion 3 in front of the spiral groove 52, a ring-shaped inward protruding portion 6 that protrudes inward is provided in the same manner as the writing instrument 1 of the first embodiment. The rear shaft portion 3 includes an outer diameter front portion 53a that is slightly smaller than the inner diameter of the inward projecting portion 6 and a rear portion 53b that is larger than the outer diameter of the front portion 53a. An operating body 53 having an engagement protrusion 54 that engages with the spiral groove 52 at the rear portion 53b can be moved back and forth while the engagement protrusion 54 is engaged with the spiral groove 52 and rotated along the spiral groove 52. A part of the rear portion 53b is arranged to protrude outward from the rear end opening 3b of the shaft portion 3.

  The inwardly projecting portion 6 is loosely fitted with a front end portion (left side in FIG. 9) of the front portion 53a of the operation body 53, and the front end of the operation body 53 is connected to the writing instrument 1 of the first embodiment. A holder push rod body 7 constituted by a similar cylindrical fixing portion 7a and a push rod portion 7b projecting forward (to the left in FIG. 9) is disposed in front of the inward projection 6 (left in FIG. 9). The internal thread portion 9 formed on the fixing portion 7a is screwed to the external thread portion 55 formed at the front end of the front portion 53a of the operation body 53, and is fixed by an adhesive, and is connected to the operation body 53. . The holder push rod body 7 can be moved back and forth in conjunction with the operation body 53. The operation body 53 is configured not to come out of the rear end opening 3 a of the shaft portion 3 by the fixing portion 7 a of the holder push rod body 7 coming into contact with the inward protruding portion 6. In this embodiment, the spring 10 is stretched between the inward projecting portion 6 of the shaft portion 3 and the rear portion 53 b of the operating body 53 to urge the operating body 53 rearward. The mating protrusion 54 moves rearward along the spiral groove 52, and the spiral pitch of the spiral groove 53 is increased so that the operation body 53 is always located behind the spiral groove 53 when the operation body 53 is not operated. It is formed in a spiral.

  A front side wall member 56 is moved in the shaft portion 3 in the shaft portion 3 in front of the fixing portion 7a of the holder push rod body 7 (left side in FIG. 9) in the same manner as the writing instrument 1 of the first embodiment. To prevent this, the pin 12 driven into the shaft portion 3 is fixed to the shaft portion 3 by being inserted into a through hole 57 (see FIG. 10) provided in the side portion 56a of the front side wall member 56. is there. As shown in FIG. 10, the front side wall member 56 is provided with a notch part 58 in which the shaft diameter of the front side wall member 56 becomes a small diameter in the approximately half circumferential part of the lower peripheral surface, and the push bar part 7 b is provided in the notch part 58. It is loosely fitted and can be rotated and moved back and forth. Further, inside the shaft portion 3 at a position behind the front side wall member 56 (rightward direction in FIG. 9) and in front of the fixing portion 7a of the holder push rod body 7, similarly to the writing instrument 1 of the first embodiment, The pin 12 driven into the shaft portion 3 is inserted into a through hole 60 (see FIG. 11) provided in the side portion 59a of the rear wall member 59 so that the rear wall member 59 does not move in the shaft portion 3. By being inserted, it is fixed to the shaft portion 3. As in the case of the front wall member 56, the rear wall member 59 is provided with a notch 61 in which the shaft diameter of the rear wall member 59 becomes a small diameter at about a half circumferential portion of the lower peripheral surface, as shown in FIG. The push bar portion 7b is loosely fitted to the portion 61 so that it can be rotated and moved back and forth.

  Similar to the writing instrument 1 of the first embodiment, the sandwiched body accommodation chamber 16 partitioned by the front side wall member 56 and the rear side wall member 59 has a spherical sandwiched shape made of brass and having a diameter of 6.4 mm. 9, the rear end surface 56 b of the front side wall member 56 and the front end surface 59 b of the rear side wall member 59 constituting the sandwiched body accommodation chamber 17 are arranged so that the upper side is on the tip portion 4 side of the shaft tube 2 in FIG. 9. It is provided with an inclination in a state of approaching about 5 degrees.

  Like the writing instrument 1 of the first embodiment, a writing body 21 and a holder member 22 are arranged in the shaft cylinder 2 in front of the front side wall member 56, and the rear end surface 22 a of the holder member 22 is A sandwiching rod portion 24 is provided, and projects into the sandwiched body accommodation chamber 16 through a sandwiching rod portion hole 62 formed in the front side wall member 56.

    As shown in FIG. 10, in the rear end face 56b of the front side wall member 56, the holding rod portion hole 62 is located at the position of the holding rod portion hole 62 through which the same holding rod portion 24 as in the first embodiment is inserted. So that the sandwiched body 17 can be engaged without rattling. Further, when the writing instrument 1 is gripped with the tip opening 28 of the shaft tube 2 extending downward in the axial diameter direction communicating with the recessed portion 63 for the sandwiched body, A guide groove 64 having a substantially semicircular cross section is provided to guide the movement of the sandwiched body 17.

  Next, the operation of the writing instrument 51 according to the second embodiment will be described with reference to FIGS. 12 to 16. First, when the operating body 53 is pressed, the engaging protrusion 54 is formed on the shaft portion 3 as shown in FIG. Since it advances along the formed spiral groove 52, the operation body 53 advances while rotating, and the push bar portion 7b of the holder push bar 7 connected to the operation body 53 also advances while rotating. The front end of the push rod portion 7 b abuts on the rear end surface 22 a of the holder member 22 to press the holder member 22. The writing body 21 moves forward in conjunction with the holder member 22, and the writing tip 21 b starts to protrude from the tip opening 28 of the shaft tube 2.

  When the operation body 53 is further pressed, the operation body 53 further advances while rotating, and the holder member 22 is further pressed by the push bar portion 7b of the holder push bar body 7 and moves forward. As a result, as shown in FIG. 13, the tip end of the sandwiching rod portion 24 is immersed in the sandwiching rod portion hole 62 provided in the front side wall member 56, and the writing tip portion 21 b of the writing body 21 is opened at the tip end of the shaft tube 2. It protrudes further from the portion 28.

  At this time, when the shaft cylinder 2 is stood so that the tip opening 28 of the shaft cylinder 2 faces downward, as shown in FIG. 14 (for convenience, the shaft cylinder 2 is drawn in a horizontal state), the front side wall is shown. Since the rear end face 56b of the member 56 and the front end face 59b of the rear side wall member 59 are inclined, the sandwiched body 17 is provided with the sandwiching bar portion 24 in the sandwiched body accommodating chamber 16 along the guide groove 64. It moves to the position side and engages with the sandwiched body recess 63 without rattling, and the sandwiched body 17 faces the sandwiching bar portion 24.

  In this state, when the operating body 53 is slightly relieved by slightly reducing the pressing force applied to the operating body 53, the writing body 21 and the holder member 22 are also retracted, as shown in FIG. By projecting into the sandwiching body receiving chamber 16 and pressing the sandwiched body 17 against the front end surface 59b of the rear side wall member 59 with the sandwiching bar portion 24, the sandwiched body 17 comes out of engagement with the sandwiched body recess 63. It is clamped by the clamping bar portion 24 and the rear side wall member 59.

  When the pressing to the operating body 53 is stopped, as shown in FIG. 16, the operating body 53 moves backward by the urging force of the spring 10 and returns to the original position. Since the spring 20 that biases the rear side is pressed rearward by the pinching rod portion 24 of the holder member 22 via the writing body 21, the pinched body 17 is pinched by the pinching rod portion 24 and the rear side wall member 59. Subsequently, the protruding state of the writing tip 21b of the writing body 21 from the tip opening 28 of the shaft cylinder 2 is maintained.

  In the writing instrument 51 of the second embodiment, the pressing force of the clamping rod portion 24 against the sandwiched body 17 by the spring 20 that biases the writing body 21 rearward and the tip of the sandwiching rod portion 24 abut against the sandwiched body 17. Since the contacting portion is the same as that of the writing instrument 1 of the first embodiment, the sandwiched body 17 is held between the sandwiching bar portion 24 and the rear side wall member 59 by a slight impact when the writing instrument 51 is placed on a desk or the like. The writing tip 21 b of the writing body 21 is immersed in the tip opening 28 of the shaft cylinder 2 after being released from the clamping.

  The present invention has an automatic return mechanism in which the writing tip of the writing body protruding from the tip opening of the shaft tube is inserted into the tip opening of the shaft tube without operating the operating body. Applies to writing instruments.

DESCRIPTION OF SYMBOLS 1,51 Writing implement 2 Shaft cylinder 5,53 Operation body 7 Holder push rod body 10 Spring 11, 56 Front side wall member 14, 59 Rear side wall member 16 Nipped object accommodation chamber 17 Nipped object 20 Spring 21 Writing object 22 Holder member 24 Nipping Rod part 26, 63 Concave part concave part 27, 64 Guide groove 28 Tip opening part

Claims (3)

  An operating body is arranged at the rear end of the shaft cylinder so as to be movable back and forth, and a front side wall and a rear side wall provided in the shaft cylinder in front of the operating body so as not to move in the shaft cylinder, Forming a sandwiched body accommodating chamber partitioned by the above, accommodating the sandwiched body, encasing the writing body by urging backward by a spring movably back and forth in the front cylinder of the front side wall portion, At the rear end of the cursive body, a holder member having a holding rod portion that penetrates the front side wall portion and protrudes into the holding body accommodating chamber and is movable back and forth with respect to the front side wall portion is connected to the operation body. A holder push rod body that is movable back and forth in conjunction with the movement of the body and that passes through the front side wall portion and the rear side wall portion and whose tip abuts or is connected to the rear end surface of the holder member is connected or integrally provided, At least for the holding bar part formed on the front side wall part through which the holding bar part on the rear end face facing the holding body accommodating chamber of the front side wall part is inserted This part is provided with a recessed portion for a clamped body that can be engaged with the clamped body when the shaft cylinder is gripped with the tip opening of the shaft cylinder facing downward, and the operating body is moved forward by operating the operating body. As a result, the holder push rod moves forward in the shaft cylinder and presses the holder member, so that the writing tip of the writing body protrudes from the tip opening of the shaft tube, and the object to be clamped is moved backward from the holding rod portion of the holder member. The writing instrument which maintains the protrusion state of a writing front-end | tip part by pinching with a side wall part.   In the movement of the sandwiched body that extends in the axial radial direction toward the sandwiched body recess, on the rear end surface facing the sandwiched body accommodation chamber of the front side wall portion, the sandwiched body is moved to the sandwiched body recess. The writing instrument according to claim 1, wherein a guide groove is provided for guiding the guide.   The holding rod portion is provided at a position biased in the vicinity of the inner wall surface side of the shaft cylinder on the rear end surface of the holder member, and at least a rear end surface facing the sandwiched body accommodation chamber on the front wall portion is provided at the front end opening of the shaft cylinder. Provided with an inclination in the axial diameter direction of the shaft cylinder so that the clamped body moves to the position where the clamping rod portion is disposed in the clamped body housing chamber when the shaft cylinder is gripped with the portion facing downward The writing instrument according to claim 1 or 2, characterized in that.

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