JP2012051234A - Knock-type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knock-type mechanical pencil capable of easily visually recognizing a lead 8 within a lead tank through a transparent part 9D of a shaft cylinder 9 and a transparent part of the lead tank.SOLUTION: The knock-type mechanical pencil delivers the lead 8 by moving a chuck 4 forward, and the transparent part is formed in the lead tank connected to the chuck 4. An inner diameter of the transparent part is set larger than an inner diameter of a lead storage chamber of the lead tank. The transparent part 9D is formed in the shaft cylinder 9, so as to enable visual recognition of the transparent part of the lead tank through the transparent part 9D of the shaft cylinder 9.

Description

  The present invention relates to a knock type mechanical pencil capable of visually checking a lead housed in a lead tank from a transparent portion formed in the lead tank.

  2. Description of the Related Art Conventionally, a mechanical pencil lead storage tube is known in which two annular ridges are provided on the inner surface of an intermediate part of a lead storage tube. (See Patent Document 1)

  However, the mechanical pencil lead housing cylinder has the advantage that the lead is not hindered from adhering to the inner surface of the lead housing cylinder so that the feeding of the lead is not disturbed. The inner powder contacts with the inner surface of the housing cylinder, and the core powder adheres to the inner surface of the core housing cylinder, thereby contaminating the inner surface of the core housing cylinder.

Japanese Utility Model Publication No. 54-179252

  The problem to be solved is that even if the lead tank is made transparent, if the core powder adheres to the inner face of the lead tank, the lead in the lead tank becomes difficult to see.

  The present invention is a knock-type mechanical pencil that feeds a lead by advancing a chuck, wherein a transparent part is formed in a lead tank connected to the chuck, and an inner diameter of the transparent part is larger than an inner diameter of a lead storage chamber of the lead tank. It has a large diameter, and a transparent portion is formed in the shaft tube, and the transparent portion of the core tank is configured to be visible through the transparent portion of the shaft tube.

  The present invention provides an advantage that the core in the core tank can be easily confirmed when the transparent portion of the core tank is visually observed from the transparent portion of the shaft tube.

FIG. 1 is a cross-sectional view illustrating a knock mechanical pencil according to a first embodiment of the present invention. Example 1 FIG. 2 is a cross-sectional view showing a knock mechanical pencil according to a second embodiment of the present invention. (Example 2) FIG. 3 is a cross-sectional view illustrating a knock mechanical pencil according to a third embodiment of the present invention. (Example 3) FIG. 4 is a cross-sectional view showing a knock mechanical pencil according to a fourth embodiment of the present invention. Example 4 FIG. 5 is an enlarged cross-sectional view showing a transparent portion of a shaft cylinder of a knock type mechanical pencil according to a fifth embodiment of the present invention. (Example 5) FIG. 6 is an enlarged cross-sectional view illustrating a transparent portion of a shaft cylinder of a knock type mechanical pencil according to a sixth embodiment of the present invention. (Example 6)

  A knock-type mechanical pencil that can easily check the core in the core tank without the core powder sticking to the transparent part of the core tank has been realized.

  Hereinafter, based on FIG. 1, the knock type mechanical pencil of Example 1 in this invention is demonstrated. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, the front part of the transparent cylinder 2 made of a transparent synthetic resin pipe is press-fitted and fixed to the outside of the rear part of the front cylinder 1 made of a synthetic resin pipe, and the front of the rear cylinder 3 made of a synthetic resin pipe is placed inside the rear part of the transparent cylinder 2 A core tank is formed by press-fitting and fixing the part. The front cylinder 1 and the rear cylinder 3 use pipe materials having the same diameter, and the outer diameters of the front cylinder 1 and the rear cylinder 3 and the inner diameter of the transparent cylinder 2 are substantially the same diameter. The front cylinder 1 and the rear cylinder 3 constitute a core storage chamber, and the inner diameter of the front cylinder 1 and the rear cylinder 3 is smaller than the inner diameter of the transparent cylinder 2.

  Next, the front part of the metal chuck 4 such as brass is divided into three parts, and a metal fastener 5 such as brass is externally fitted to the head 4A of the chuck 4 divided into three parts. Further, a disk-shaped connecting tool 6 for receiving the fastener 5 is placed on the chuck 4, and the rear part of the chuck 4 is press-fitted and fixed to the front cylinder 1. Further, a spring 7 is provided between the connecting tool 6 and the front end of the front cylinder 1, and usually a fastener 5 pressed against the head 4 </ b> A of the chuck 4 is brought into contact with the connecting tool 6 to constitute a mechanism part. . The distance L1 from the rear end of the chuck 4 to the front end of the rear cylinder 3 and the distance L2 from the rear end of the front cylinder 1 to the rear end of the rear cylinder 3 are based on the total length of the core 8 stored in the core tank. Make it short.

  Further, a rubber grip 10 is provided on the front narrow diameter portion 9A of the shaft tube 9 made of a transparent synthetic resin, and a crown 12 integrally formed with a clip 11 is attached to the rear portion of the shaft tube 9. It is done. That is, the projection 12A of the crown 12 is engaged with the locking hole 9B of the shaft tube 9, the key 12B of the crown 12 is engaged with the key groove 9C of the shaft tube 9, and the crown 12 is connected to the shaft tube. 9 is attached to the rear.

  The mechanism portion is inserted from the front of the shaft tube 9, and an eraser support 13 is press-fitted and connected to the outside of the rear portion of the rear tube 3 of the core tank. An eraser 14 is attached to the rear inner side of the eraser support 13, and a knob 15 covering the eraser 14 is detachably fitted to the rear outer side of the eraser support 13. A plurality of spare cores 8 are stored in the core tank.

  Further, a tip member 17 incorporating a rubber core holder 16 is detachably screwed to the front portion of the shaft tube 9, and the connecting tool 6 is held between the inner stage 17 </ b> A of the tip member 17 and the front end of the shaft tube 9. A knock type mechanical pencil.

  In this knock type mechanical pencil, since the shaft tube 9 is configured to be transparent, the core 8 in the core tank can be visually observed through the transparent portion 9D of the shaft tube 9 and the transparent tube 2 of the core tank. In addition, the lead 8 in the lead tank is guided by the front tube 1 and the rear tube 3, and the transparent tube 2 and the lead 8 are not in contact with each other, so there is no fear that the powder of the lead 8 adheres to the transparent tube 2. Therefore, the transparent cylinder 2 is configured to be able to easily confirm the core 8 in the core tank while always maintaining transparency.

  Hereinafter, based on FIG. 2, the knock type mechanical pencil of Example 2 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. Fixing portions 102A and 102B having inner diameters substantially the same as the outer diameters of the front cylinder 1 and the rear cylinder 3 are formed at the front and rear portions of the transparent cylinder 102 in the core tank, and the inner diameter of the intermediate section 102C is set to the front cylinder 1 and The rear cylinder 3 is formed with a diameter smaller than the outer diameter and larger than the inner diameter. The rear part of the front cylinder 1 is press-fitted and fixed to the fixing part 102A at the front part of the transparent cylinder 102, and the front part of the rear cylinder 3 is press-fitted and fixed to the fixing part 102B at the rear part of the transparent cylinder 102. The front cylinder 1 and the rear cylinder 3 constitute a core storage chamber. The distance L1 from the rear end of the chuck 4 press-fitted to the front cylinder 1 to the front end of the rear cylinder 3 and the distance L2 from the rear end of the front cylinder 1 to the rear end of the rear cylinder 3 are It is configured to be shorter than the total length of the core 8 to be stored.

  Hereinafter, based on FIG. 3, the knock type mechanical pencil of Example 3 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, the rear cylinder 103 having the transparent portion 103A is made of a transparent synthetic resin, and a fixing portion 103B having an inner diameter substantially the same as the outer diameter of the front cylinder 1 is formed in the front portion of the rear cylinder 103. The inner diameter of the transparent part 103A of the rear cylinder 103 is formed to be larger than the inner diameter of the front cylinder 1 and the inner surface 103C of the intermediate part of the rear cylinder 103, and the fixing part 103B of the rear cylinder 103 is press-fitted and fixed to the rear part of the front cylinder 1. Construct a wick tank. In addition, a core storage chamber is configured by the intermediate portion inner surface 103 </ b> C of the front cylinder 1 and the rear cylinder 103. Further, an eraser 14 is attached to the rear inner side of the rear cylinder 103, and a knob 15 covering the eraser 14 is detachably fitted to the rear outer side of the rear cylinder 103. A plurality of spare cores 8 are stored in the core tank. A distance L1 from the rear end of the chuck 4 press-fitted and fixed to the front cylinder 1 to the front inner stage 103D of the rear cylinder 103, and a distance L2 from the rear end of the front cylinder 1 to the rear inner stage 103E of the rear cylinder 103 Is configured to be shorter than the total length of the lead 8 stored in the lead tank.

  Hereinafter, based on FIG. 4, the knock type mechanical pencil of Example 4 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, the front cylinder 101 having the transparent portion 101A is made of a transparent synthetic resin, and the inner diameter of the transparent portion 101A is formed to be larger than the inner diameter of the front portion 101B of the front cylinder 101. The inner diameter of the front portion 203F of the rear cylinder 203 is formed to be smaller than the inner diameter of the transparent portion 101A, and the outer diameter of the fixing portion 203B of the rear cylinder 203 is formed to be substantially the same as the inner diameter of the transparent portion 101A. A fixing tank 203B of the rear cylinder 203 is press-fitted and fixed to the transparent part 101A of the front cylinder 101 to constitute a core tank. Further, the front storage portion 203F of the front tube 101 and the front portion 203F of the rear tube 203 constitute a core storage chamber. Further, an eraser 14 is attached to the rear inner side of the core tank, and a knob 15 covering the eraser 14 is detachably fitted to the rear outer side of the core tank. A plurality of spare cores 8 are stored in the core tank. The distance L1 from the rear end of the chuck 4 press-fitted and fixed to the front cylinder 101 to the front end of the rear cylinder 203, and the distance L2 from the inner stage 101C of the front cylinder 101 to the rear inner stage 203E of the rear cylinder 203 are: The length of the lead 8 stored in the lead tank is shorter than that of the lead tank.

  Hereinafter, based on FIG. 5, the knock type mechanical pencil of Example 5 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, the inner shape of the transparent portion 109D of the shaft tube 109 positioned outside the transparent tube 2 is formed in a polygonal cross section, and the outer shape of the transparent portion 109D of the shaft tube 109 is formed in a substantially circular cross section, and is made of a transparent resin. The transparent portion 109D of the shaft tube 109 has a lens effect.

  Therefore, the core 8 housed in the core tank can be enlarged and visually observed.

  Hereinafter, based on FIG. 6, the knock type mechanical pencil of Example 6 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, a flat ground portion 209E is formed opposite to the inner surface of the transparent portion 209D of the shaft tube 209 positioned outside the transparent tube 2, and the outer shape of the transparent portion 209D of the shaft tube 209 is formed in a substantially circular cross section, The transparent portion 209D of the shaft barrel 209 thus configured is provided with a lens effect.

  Therefore, the core 8 housed in the core tank can be enlarged and visually observed.

  Note that the present invention is not limited to the above-described embodiments, and one member such as a shaft cylinder, a chuck, a front cylinder, a transparent cylinder, a rear cylinder, an eraser support, a head crown, and a knob is provided for simplicity of explanation. However, they may be integrated by screwing and fitting two or more parts. As the synthetic resin forming the transparent portion of the core tank, acrylic, polycarbonate, AS resin, and ABS resin are conceivable, and an antistatic agent is added or an antistatic treatment is performed as necessary.

  The core accommodated in the lead tank can be applied to a knock type mechanical pencil that can be easily seen through the transparent part of the lead tank and the transparent part of the shaft cylinder.

4 Chuck 8 core 9 Shaft cylinder 9D Transparent portion of shaft barrel 9 109 Shaft barrel 109D Transparent portion of shaft barrel 109 209 Shaft barrel 209D Transparent portion of axle barrel 209

Claims (1)

  A knock-type mechanical pencil that feeds the lead by advancing the chuck, and a transparent part is formed in the lead tank connected to the chuck, and the inner diameter of the transparent part is larger than the inner diameter of the lead storage chamber of the lead tank. In addition, the knock type mechanical pencil is characterized in that a transparent portion is formed on the shaft cylinder, and the transparent portion of the core tank is made visible through the transparent portion of the shaft cylinder.

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