JP2007130961A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil, not only the color of ink of which can be recognized visually but also which is full of color sense as the whole writing utensil. <P>SOLUTION: In the retractable writing utensil with a double push-button type retracting and extending mechanism utilizing a rotor, a barrel and the ink cartridge of a refill are made of a transparent or semi-transparent synthetic resin and the rotor of the retracting and extending mechanism, a push-button member and a push-button cover are made of a synthetic resin having the same color as the color of ink filled in the ink cartridge. By fastening the rotor to the tail end part of the ink cartridge, the retracting and extending mechanism and the refill are integrated. In addition, by making the push-button cover detachable from the push-button member, the push-button cover removed from the push-button member is utilized as the cap of a replacement refill by fittingly attaching to a pen body part at the tip of the refill. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

    The present invention relates to a knock-type writing instrument in which a pen body portion appears and disappears by a double-knock type appearance mechanism that uses a rotor.

  A double-knock type in / out mechanism using a rotor is frequently used as a ball pen refill in / out mechanism of a knock type writing instrument, for example, a knock type ball pen. This protruding / retracting mechanism has an advantage that both the protruding operation and the immersing operation of the pen body portion from the opening of the shaft barrel at the tip of the refill can be performed by the same knocking operation of pressing the knock cover protruding from the tail end of the shaft tube.

In such a mechanism, the rear end of the refill that is springed toward the tail end by the spring is in contact with the rotor, and the knock cover is fitted when a knock operation is performed to press the knock cover protruding from the tail end of the shaft cylinder. The cam tooth at the front end of the knock member that is attached meshes with the cam tooth formed on the rotor to apply a rotational force to the rotor, and the rotor is inserted into the vertical groove of the cam cylinder formed on the inner surface of the shaft cylinder. Advance along. When the rotor comes out of the cam cylinder, the pen body at the tip of the refill protrudes from the opening at the tip of the shaft cylinder, and the rotor enters a free state so that it rotates slightly in the rotation direction. When it is locked to the locking portion, writing becomes possible. When the knock operation is performed again from this state, the locking of the tip of the protruding portion of the cam cylinder and the locking portion of the rotor is released, and the rotor moves backward along the vertical groove of the cam cylinder, so the pen body portion Immerses in the barrel.
Japanese Utility Model Publication No. 38-18622

  By the way, recently, as the number of colors of ink has increased, many writing instruments with rich color sensations have been made, in which the shaft cylinder and refill ink cylinder are molded with a transparent or translucent synthetic resin so that the color of the ink can be visually confirmed. It has been put into practical use. However, the parts of the mechanism such as the rotor and knock member are molded of black synthetic resin, for example. It was a writing instrument.

  Accordingly, an object of the present invention is to provide a writing instrument that can not only visually check the color of the ink but also has a rich color sensation as the entire writing instrument.

In order to achieve this object, claim 1 is fitted to a rotor that advances along a cam cylinder formed on the inner surface of a shaft cylinder, a knock member that advances the rotor while applying a rotational force, and a knock member In a knock-type writing instrument in which the pen body part at the tip of the refill mounted in the shaft cylinder is projected and retracted from the opening at the tip of the shaft cylinder by a double knock type projecting mechanism including a knock cover, the shaft cylinder and the refill ink cylinder are transparent or Molded with a translucent synthetic resin, the rotor, knock member, and knock cover of the intrusion mechanism were molded with the same color synthetic resin as the ink filled in the ink cylinder, and the rotor was fixed to the tail end of the ink cylinder Integrate the haunting mechanism with the refill.
According to a second aspect of the present invention, in the knock type writing instrument according to the first aspect, the knock cover can be attached to and detached from the knock member, and the replacement refill has the knock cover removed from the knock member attached to the pen body portion at the tip of the refill. Fit and use as a cap.

  Because the rotor, knock member, and knock cover of the in / out mechanism are molded from the same color resin as the ink filled in the ink cylinder, the rotor is fixed to the tail end of the ink cylinder and the in / out mechanism is integrated with the refill. In addition to visually confirming the color of the ink, the writing instrument is rich in color sensation as a whole writing instrument. And even if it replaces with a refill with a different ink color, the color of the parts of the appearance mechanism is the same color as the color of the ink, so that the writing instrument is always rich in color sense as the whole writing instrument.

  If the knock cover is detachably attached to the knock member as in claim 2, the replacement refill is used as a cap by removing the knock cover from the knock member and fitting it to the pen body at the tip of the refill. Since this is possible, the pen body portion of the replacement refill can be protected and ink evaporation can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In FIG. 1, a plurality of vertical ribs 14 are formed on the inner peripheral surface of a shaft cylinder 10 formed into a cylindrical shape integrally with a clip 16 with a transparent synthetic resin, and the vertical ribs 14 and the vertical ribs 14 are formed. A cam cylinder is constituted by the longitudinal groove between the two. An annular protrusion on the tail end side of the vertical rib 14 is a retaining step portion 15 of the refill 20. A tip port 11 having a center hole 12 is detachably screwed into the tip opening of the shaft tube 10. A locking step 13 in which one end of the coil spring 30 is locked is formed in the tip 11. The coil spring 30 is held by the tip 11 in a state where one end thereof is press-fitted into the peripheral wall of the locking step 13.

  The ink cylinder 21 of the refill 20 is formed into a cylindrical shape from a transparent synthetic resin, and is filled with ink (not shown). Therefore, the color of the ink can be visually observed through the transparent ink cylinder 21 and the shaft cylinder 10. A joint 22 is fitted to the tip of the ink cylinder 21, and a pen body portion 23 is fitted to the center hole of the joint 22. The pen body portion 23 is formed of stainless steel into a bullet shape, and is a ballpoint pen in which a ball made of a cemented carbide with a diameter of 0.5 mmφ is rotatably held in a ball house at the tip. The joint 22 is formed with a collar portion 24 that is a positioning member when fitted to the ink cylinder 21, and the front surface of the collar portion 24 is a forward stepped portion 25 that receives the other end of the coil spring 30. That is, the refill 20 is repelled toward the tail end by the coil spring 30 interposed between the locking step 13 of the front opening 11 and the forward stepped portion 25 of the refill 20.

  As is well known, the double knock type intrusion mechanism is composed of a rotor 40, a knock member 50, and a knock cover 60, and these parts are synthetic resins having the same color as the ink filled in the ink cylinder 21, for example, an ink cylinder. When 21 is filled with blue ink, it is molded with a blue synthetic resin. Cam teeth 41 are formed on the rotor 40, and guide protrusions 42 that protrude in the radial direction are formed. Cam teeth 51 are also formed at the tip of the knock member 50, and a retaining protrusion 52 is formed on the outer periphery. A tapered locking collar 43 is formed at the tail end of the rotor 40. When the tail end of the rotor 40 is inserted into the knock member 50, the locking collar 43 knocks in the process. When the tail end portion of the member 50 is elastically deformed and expands, and the locking collar 43 penetrates the tail end portion of the knock member 50, the tail end portion is restored and the knock member 50 and the rotor 40 cannot be separated. . A plurality of vertical ribs 61 are formed in the inner bottom portion of the knock cover 60, and the diameter of the virtual inscribed circle of the vertical rib 61 is equal to the outer diameter of the pen body portion 23. The knock cover 60 is detachably fitted to the knock member 50.

  The cylindrical end portion 44 of the rotor 40 is press-fitted into the tail end opening of the ink cylinder 21, and a retracting mechanism including the rotor 40, knock member 50, and knock cover 60 is integrated with the refill 20. As described above, since the rotor 40, the knock member 50, and the knock cover 60 are formed of the same color synthetic resin as the ink filled in the ink cylinder 21, the refill 20 is rich in color sense. The guide protrusions 42 of the rotor 40 are fitted in the vertical grooves between the vertical ribs 14 of the cam cylinder. When the knock cover 60 is pressed, the cam teeth 41 of the rotor 40 and the cam teeth 51 of the knock member 50 are teeth. The rotor 40 moves forward in a state where a rotational force is applied. When the guide protrusion 42 comes out of the cam cylinder, the pen body portion 23 at the tip of the refill 20 protrudes from the center hole 12 of the tip 11 and the rotor 40 is in a free state, so that the guide protrusion 42 rotates slightly in the rotation direction. When it is locked to the tip of the vertical rib 14 of the cam cylinder, writing becomes possible. Then, when the knocking operation is performed again from this state, the engagement between the tip of the vertical rib 14 of the cam cylinder and the guide projection 42 is released, and the rotor 40 moves backward along the vertical groove of the cam cylinder, and the pen body portion 23. Is immersed in the front entrance 11.

    FIG. 2 shows the replacement refill 20. The rotor 40, the knock member 50, and the knock cover 60 are also made of synthetic resin having the same color as the ink filled in the ink cylinder 21, for example, the ink cylinder 21 is filled with red ink. It is molded with a red synthetic resin. The vertical rib 61 of the knock cover 60 is fitted to the pen body portion 23, and the knock cover 60 is used as a cap for the replacement refill 20. Therefore, the pen body portion 23 is protected and the ink is prevented from evaporating, and the ink is not inadvertently attached to clothes or the like.

  When replacing the refill 20, when the knock cover 60 is pulled out from the knock member 50 and removed from the state shown in FIG. 1 and the tip 11 is removed from the shaft tube 10, the refill 20 can be pulled out from the front end opening of the shaft tube 10. it can. In order to mount the replacement refill 20 on the shaft tube 10, the knock cover 60 is removed from the pen body portion 23, and is pointed from the front end opening of the shaft tube 10, and the tip 11 is screwed onto the shaft tube 10. In both cases, the knock cover 60 may be fitted to the knock member 50 and can be replaced very easily. Accordingly, if a plurality of replacement refills having different ink colors are prepared, it can be used as a multicolor writing instrument, and there is an advantage that only one shaft tube 10 or the like is required.

It is sectional drawing of this invention Example. It is sectional drawing of the refill for exchange.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shaft cylinder 11 Front port 20 Refill 21 Ink cylinder 22 Joint 23 Pen body part 30 Coil spring 40 Rotor 50 Knock member 60 Knock cover

Claims (2)

A double knock type retracting mechanism comprising a rotor that advances along a cam cylinder formed on the inner surface of the shaft cylinder, a knock member that advances the rotor while applying a rotational force, and a knock cover that is fitted to the knock member. In the knock type writing instrument that causes the pen body part at the tip of the refill mounted in the shaft tube to protrude from the tip opening of the shaft tube,
The shaft cylinder and the refill ink cylinder are molded from a transparent or translucent synthetic resin, and the rotor, knock member, and knock cover of the intruding mechanism are molded from a synthetic resin of the same color as the ink filled in the ink cylinder, The knocking writing instrument, wherein the rotor is fixed to the tail end portion of the ink cylinder, and the projecting mechanism is integrated with the refill.   The knock cover can be attached to and detached from a knock member, and the replacement refill is used as a cap when the knock cover removed from the knock member is fitted to a pen body portion at the tip of the refill. Item 10. A knocking type writing instrument according to item 1.

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