JPS6130880Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a so-called lead holder type writing instrument in which the core is gripped and released by cooperation and release between the core gripping means and the outer shaft. The present invention relates to a mechanism for adjusting the protrusion length of a core in a writing instrument, which facilitates adjustment of the protrusion length of the core from a gripping means.

As shown in FIG. 1, the structure of a conventional lead holder type writing instrument includes a core gripping means 2 made of a highly wear-resistant material such as metal or synthetic resin in an outer shaft 1; A center shaft 3 connected to the means 2 is always resiliently disposed backward by a resilient member 4, and a core gripping part 2a, which is the tip of the core gripping means 2, is connected to the outer shaft. The core body 5 is gripped and released by cooperation with and release from the distal end portion 1a of the core body gripping portion 2a (preferably made of a material with high wear resistance and impact resistance as it cooperates with the core body gripping portion 2a). This is what I did. Therefore, inside the outer shaft 1 (usually inside the center shaft 3)
In order to bring the core housed in the inner shaft into the writing state shown in Figure 1, point the tip 1a of the outer shaft 1 downward and insert the inner shaft 3.
When the elastic member 4 is compressed by pressing the rear end, the core gripping means 2 moves forward at the same time as the compression, and the cooperation between the tip 1a of the outer shaft 1 and the core gripping part 2a is released. The core gripping portion 2a expands outward, and the core that has fallen under its own weight protrudes outside the outer shaft 1, so support the tip of the protruding core 5 with your fingers or the like or push it onto a desk or the like. After adjusting the protrusion length, the pressing force of the center shaft 3 is released, and the elastic force of the elastic member 4 causes the core body gripping part 2a to cooperate with the tip 1a of the outer shaft 1 again. He held the body 5 and was in a writing state. However, in such an operation of protruding the core, adjusting the protrusion length of the core is troublesome and often inconvenient.

Therefore, the present invention aims to eliminate as much as possible the trouble of adjusting the protruding length of the core of the lead holder type writing instrument described above by making improvements to the tip of the outer shaft, the core gripping means, and the core. It is. below,
The features of the present invention that are different from those shown in FIG. 1 will be explained in detail with reference to the accompanying drawings. Note that the same members as in FIG. 1 are given the same reference numerals.

FIG. 2 shows a first embodiment of the present invention, in which a protrusion 1b is provided on the inner wall of the tip portion 1a of the outer shaft 1, and the protrusion 1b is located at the core gripping portion of the core gripping means 2. A certain space S exists between the outer wall of the core gripping means 2 and the outer wall of the core gripping means 2 while the outer shaft 2a and the tip 1a of the outer shaft 1 are cooperating with each other. Further, the outer wall of the core gripping means 2 is provided with a stepped portion 2b for more clearly identifying the degree of expansion of the core gripping portion 2a. Furthermore, a stopper member 5a movable in the longitudinal direction is fixed to the outer periphery of the core body 5. Although the stopper member 5a is not shown, it makes the movement and fixation to the core body 5 more reliable. For this reason, a small protrusion can be provided inside the same. Therefore, the core gripping part 2a is directed downward (the core 5 falls into the core gripping means 2 by its own weight), and the rear of the center shaft 3 is directed forward against the elastic force of the elastic member 4. When pressed, the core gripping means 2 moves forward, the protrusion 1b comes into contact with the outer wall of the core gripping means 2, the space S disappears, and the core gripping part 2a cooperates with the tip 1a of the outer shaft 1. is released and becomes a semi-expanded state (see Figure 3). When the core gripping part 2a is in the half-expanded state, the core gripping part 2a releases the grip on the core 5, but does not allow the stopper member 5a of the core 5 to pass (from the outside of the core gripping part 2a). is held in a state in which it cannot escape. The protrusion length of the core body 5 is adjusted in the state shown in FIG. Only the core body 5 can be pulled out without changing the position of the member 5a. In addition to such adjustment of the protruding length, the rear end of the center shaft 3 is pressed further than the state shown in FIG. 3, and the core gripping portion 2a is brought into a completely expanded state (see FIG. 4). The protrusion length can also be adjusted by taking out the core body 5 and moving the stopper member 5a. In addition, the core gripping part 2
When changing a from a semi-expanded state to a fully expanded state, the stepped portion 2b of the core gripping means 2 is used to more clearly identify the division.

5 and 6 show second and third embodiments of the present invention. In FIG. 5 showing the second embodiment, the major difference from the first embodiment is that the core gripping means 2 is In FIG. 6 showing the third embodiment, in addition to the second embodiment, in order to more clearly distinguish the expanded state of the core gripping portion 2a, A recess 1c and a small protrusion 1d are provided in the tip 1a of the outer shaft 1.

Since the present invention has the above-mentioned configuration, the protruding length of the core can be adjusted by setting the core gripping part in a semi-expanded state, and at the same time, the core gripping part can be fully opened and the core can be taken out. This has the practical effect that the protrusion length can be adjusted by moving the stopper member. In addition, colored pencil leads, ballpoint pen refills, sharp pencils, etc. can be used as the core of the present invention.
In addition to the case in which the core body is housed singly within the outer shaft, for example,
174385, or Tokuko Sho 49-35208 and Jikko Sho 51
The present invention can also be applied to multi-core chamber type writing instruments such as those disclosed in Japanese Patent Application No. 17934.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part showing a conventional example, Fig. 2 is a sectional view of the main part showing an embodiment of the present invention, Figs.
The figure is an explanatory diagram of the operation, and FIGS. 5 and 6 are sectional views of main parts showing other embodiments. 1... Outer shaft, 1a... Tip, 1b, 2c...
Protrusion, 2...Core gripping means, 2a...Core gripping portion, 3...Center shaft, S...Space.

Claims (1)

[Scope of utility model registration request] A core gripping means and a center shaft connected to the core gripping means are disposed inside the outer shaft so as to always be elastically rearward, and the core gripping portion, which is the tip of the core gripping means, is attached to the outer shaft. In a writing instrument that cooperates with the tip and has a core housed in the outer shaft, a longitudinally movable stopper member is fixed to the outer periphery of the core, and the outer wall of the core gripping means or the tip of the outer shaft is fixed to the outer periphery of the core. Providing a protrusion on one of the inner walls with a space between it and the other wall,
When the cooperation between the core gripping part and the outer shaft tip is released,
A protrusion of the core in a writing instrument in which the protrusion and a wall are brought into temporary contact so that the core gripping means is in a semi-expanded state in which the stopper member does not slip out from the core gripping portion. Length adjustment mechanism.