JP2003175694A - Intermediate barrel suppressing unit for ballpoint pen or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide an intermediate barrel unit for a ballpoint pen or the like in which the distal end of an intermediate barrel can be projected or retracted and suppressed merely by operating to invert a sheath, and which has a wide utilizing range in the ballpoint pen in which the distal end of the intermediate barrel is projected or retracted from the distal end of the sheath and retracting is suppressed and the protruding state is held. <P>SOLUTION: The ballpoint pen comprises the sheath 1 having a barrel hole 2 and communicating recesses 3 and 4, a slip shaft 4 disposed in the barrel hole, a ball 6 disposed in the recess, and a writing tip 7. Since the slip shaft 4 in which the rear part 7a of a refill is inserted and integrated, is brought at its conical surface 5a into pressure contact with a tapered curved surface 3a via the ball 6 in the state in which the tip 7 is directed downward, the tip 7 can write without retracting in the sheath. On the contrary, the ball 6 moves to the recess 4 by its own weight in the state in which the tip 7 is directed upward, the shaft 5 integrated with the refill also moves downward, and hence the tip 7 is retracted in and contained in the sheath. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a device capable of protruding and retracting a distal end of a central portion of a writing unit or the like from a distal end of a sheath body to prevent a protruding writing unit or the like from entering and keeping a protruding state. 2. Description of the Related Art Conventional ballpoint pens and the like require an operation such as knocking a writing part in and out or protruding a writing part so as to suppress or hold the writing part or to turn a part of a barrel. And had These operations were cumbersome because they existed separately from the original purpose of writing. In addition, the writing unit could be immersed in conjunction with the clip operation, but the structure was complicated. In addition, the utility model publicity has a central shaft deterrent device such as a ballpoint pen in Utility Model Application Advertisement Advertisement Application No. 60-33023, which required operations such as shaking and hitting the sheath to prevent the central shaft from protruding or retracting. . [0003] The present invention will be described by taking a ballpoint pen as an example. When writing with a ballpoint pen or the like, attention is paid to the standard behavioral characteristic that the writing portion is directed downward, and writing is performed. By simply pointing the part downward, the writing part protrudes from the sheath and suppresses immersion, the projected state is maintained and writing is possible, and the writing part is immersed in the sheath just by turning the writing part and turning it upwards It is an object of the present invention to provide an inexpensive center shaft restraining device that can be easily handled and has a wide range of use, a small number of parts, and a small number of components. Means for solving the problem will be described with reference to the drawings using a practical example of a ballpoint pen. (1) A sheath body 1 having an appropriate outer diameter and length is attached to a refill rear portion 7a. The sliding shaft 5 is connected with the shaft hole 2 which can be movably accommodated in the longitudinal direction, and the opening 2a which allows only the writing portion 7 to protrude and retract from the distal end portion to be locked. (2) The sliding shaft 5 is provided with a recess on one side into which the rear portion 7a of the refill can be inserted, and is integrally joined with the refill,
A conical surface 5 a is formed at the rear end of the other end and is disposed in the shaft hole 2. In this case, the total length from the tip of the writing portion to the rear end of the slide shaft is equal to the conical surface 5 when the writing portion 7 protrudes from the sheath.
a is prepared so as to protrude into the recess 3. (3) A cylindrical concave portion 3 having an enlarged diameter is provided at a rear portion of the shaft hole 2, and a tapered curved surface 3 a whose diameter is reduced substantially in parallel with the conical curved surface 5 a of the slide shaft is provided therefrom to form a spherical body 6. And a concave portion 4 having a depth and a width sufficient to allow the writing portion 7 to be immersed in the sheath. (4) A spherical body 6 having a small diameter and a movable diameter having a small play between the sliding conical surface 5a and the tapered curved surface 3a is disposed in the concave portion. (1) As shown in FIG. 1, if the writing portion 7 is now turned downward, the writing portion 7 protrudes from the sheath by the weight of the refill and the slide shaft 5 and has a spherical shape. 6 also moves to the concave portion 3 and contacts the conical surface 5a of the slide shaft. In this case, when a writing pressure is applied to the writing portion 7, the slide shaft 5 is slightly pushed up and the tapered curved surface 3 a is interposed with the sphere 8.
, The slide shaft 5 cannot move further upward. Therefore, the writing section 7 is prevented from immersing into the sheath, and the writing section 7 can be written while maintaining the protruding state. (2) When the writing instrument is used in a horizontal direction toward a wall or the like, once the writing unit 7 is protruded downward, writing can be performed horizontally as it is. (3) As shown in FIG. 2, if the writing portion 7 is now turned upward, the sphere 6 moves to the concave portion 4 by its own weight, and the sliding shaft 5 integrated with the refill also moves downward. Immerses in the sheath. In this case, as shown in FIG. 3, by providing the clip 9 so that the writing portion 7 faces upward when stored in the pocket, the writing portion 7 can be stored in the pocket as it is. Nor. (4) When the writing implement is stored in a pencil case or the like, the writing part 7 is once immersed in the sheath body with the writing part 7 directed upward, and then stored.
There is no problem if you leave the writing section. (5) As shown in FIG. 3, the same effect can be obtained by forming the rear portion 7a of the refill or the conical surface 5a of the slide shaft as a hemispherical curved surface 8. (6) The above is an explanation in the case of using a ballpoint pen or the like as an example. However, the present invention is not limited to this example, but a stick-shaped object or a tapered object that can be used as a center axis such as a stationery compass or a chisel. Etc., and the range of use is wide and practical. [0006] (1) It is not necessary to perform a cumbersome operation for knocking, turning, shaking, or the like, to protrude and suppress the center shaft, and the handling can be performed extremely simply by inverting the sheath up and down. (2) In the case of a ballpoint pen or the like as shown in FIG. 3, by providing the clip 9 so that the writing unit 7 faces upward when stored in the pocket, the writing unit can be stored in the pocket with the writing unit facing upward, Therefore, it is not stored in the pocket with the writing section protruding, and the clothes are not stained. (3) The central shaft protruding / retracting device is entirely formed inside the sheath, and the outer shape of the sheath can be freely formed since a knock bar or the like related to the outer shape of the sheath is not required. (4) Since the structure is simple and the number of parts is small, the manufacturing cost can be reduced, the size can be reduced, and the cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment in which the present invention is applied to a ballpoint pen. FIG. 1 is a cross-sectional view when the writing unit is protruded. FIG. 2 is a cross-sectional view when the writing unit is stored. FIG. 3 is a cross-sectional view of a practical case. 4 is recess 3
a is a tapered curved surface 5 is a sliding axis 5a is a conical surface of a sliding axis 6 is a sphere 7
Is the writing part 7a is the rear part of the refill 8 is the hemispherical curved surface of the sliding axis 9 is the clip

Claims (1)

Claims: (1) A sheath having an appropriate outer diameter and length,
A shaft hole capable of accommodating the center shaft movably in the longitudinal direction, and an opening capable of protruding and retracting a center shaft front end portion of a predetermined length to be locked are provided in a sheath body front end portion, and a rear portion of the shaft hole. The diameter of the cylindrical recess is increased, and the diameter and width of the recess are gradually reduced from the rear end of the recess to a tapered shape. Drill the cavities that have. (2) The center shaft has a rear portion formed in a conical shape, or has a center shaft insertion portion on one side and is integrally joined to a slide shaft formed on the other side in a conical shape, and the shaft hole of (1) above. To place. In this case, the total length from the front end of the center shaft to the apex of the rear end cone is such that the conical portion protrudes into the cylindrical recess in a state where a predetermined length from the front end of the center shaft protrudes from the opening of the sheath body front end portion. Is prepared. (3) a movable diameter having a small clearance between the central conical surface and the concavely tapered curved surface in the concave portion of (1);
A sphere with the proper weight is placed. The center axis suppressing device such as a ball-point pen configured as described above.