JPH0721350Y2 - Red holder type writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a so-called red holder type writing instrument in which a core body is grasped and released by cooperation and release of a core body grasping means and an outer shaft, In particular, the present invention relates to a core body using a core body containing ink such as a ballpoint pen refill or mechanical pencil and a writing material such as a pencil core.

[Prior Art and Its Problems] Most of the conventional red holder type writing instruments are used by accommodating a core such as a pencil core or an eraser as a core in a barrel and appropriately protruding it from the tip of the core gripping portion during use. There is still room for improvement when storing ballpoint pen refills and mechanical pencils. A core body such as a ballpoint pen refill or mechanical pencil is formed by being connected to a front portion which is a writing portion and a rear portion which stores ink and a pencil lead. The core body of the ball-point pen refill or mechanical pencil is gripped by the core body gripping portion, and the connecting portion between the front portion and the rear portion of the core body is located in front of the rear end of the core body gripping portion. ing.

However, since the connecting portion between the front portion and the rear portion of the core body is located in front of the rear end of the core body gripping portion, the joint portion receives a load due to the writing pressure, and damage, rattling, etc. There was a risk of causing problems.

Further, the protrusion amount of the core body is adjusted mainly by bringing the tip end of the core body into contact with the writing surface, so that the tip end of the core body may be damaged. In particular, when the core is a ball-point pen, the tip portion is damaged and writing becomes impossible.

[Means for Solving the Problem] The present invention has been made in view of the above-described problems, and always repels the center shaft connected to the core body gripping means accommodating the writing to the outer shaft. In the red holder type writing instrument in which the core body gripping portion serving as the tip end portion of the core body gripping means is arranged to cooperate with the tip end portion of the outer shaft, and the core body is housed inside the outer shaft, The core is configured by connecting the rear part and the front part, and the front part is a writing part that abuts the writing surface, and at the front end of the rear part, or
A locking step is provided in the front part, the locking step is brought into contact with the rear end of the core gripping part, and the length of the front part is longer than the length of the core protruding from the rear end of the core gripping part. The idea is to make it larger.

[Operation] By setting the relationship between the length l ₁ of the core protruding from the tip of the core gripping part of the core and the total length l ₂ of the front part to be l ₁ <l ₂ , the connecting part between the front part and the rear part is always required. Since it is located rearward of the rear end of the core gripping means, the load during writing can be prevented as much as possible.

[Embodiment] A more detailed description will be given below with reference to the accompanying drawings.

Inside the outer barrel 1, a core body gripping means 2 made of a material having a high abrasion resistance, such as metal or synthetic resin, and a center shaft 3 connected to the core body gripping means 2 are repelled. The core body gripping means 2a, which is a tip end portion of the core body gripping means, is always elastically arranged rearward by the member 4, and the core body 5 (ballpoint pen refill) is moved by cooperation and release with the tip end portion 1a of the outer shaft 1. It is designed to be grasped and released. The core body 5
Is the front part 5a, which is the tip part (writing part) of the ballpoint pen.
And a rear portion 5b which is an ink tank portion in which the ink L of the handwriting is stored, and the front portion 5a and the rear portion 5b are connected by an appropriate means such as press fitting. When the core body 5 is a mechanical pencil, a pencil core, which is a writing material, is housed in the rear portion, and the connection is generally made by screwing. Further, the core body 5 is provided with a locking step portion 6 for preventing fall and positioning. Further, the core body 5
When the length from the rear end of the core body gripping portion 2a to the front end of the front portion 5a is l _{2 in} the state of protruding, it is set as l ₁ and the front portion 5a of the core body 5 is
The lengths of l ₁ and l ₂ are always set so that l ₁ <l ₂ .

Next, the operation will be described based on the configuration described above.

When the core body gripping means 2 is directed downward and pressed from the rear side of the center shaft 3 against the elastic force of the elastic body 4, the core body gripping means 2 advances and the tip 1a of the outer shaft 1 and the core body gripping part. The cooperation with 2a is released, and the core body 5 falls due to its own weight, and the locking step portion 6 of the core body 5 abuts and locks the core body gripping portion 2a to finish the fall. Then, after releasing the pressing, the core body 5 is gripped by the cooperation of the core body gripping portion 2a and the tip portion 1a of the outer shaft 1. Here, in front of the connecting portion 5c of the core body 5 including the front portion 5a and the rear portion 5b, that is, the front portion 5a is the core body gripping portion.
It will be gripped by 2a. The position of the locking step 6 and the contact position of the locking step 6 in the core gripping means 2 are adjusted so that the core protruding length is set to about 2 mm to 10 mm. There is no need to adjust it and you will always get the same overhang length.

Here, as shown in FIG. 2, the locking step portion 6 is formed by forming the locking step portion 6 as a separate member between the front portion 5a and the rear portion 5b of the core body 5, or as shown in FIG. The locking step 6 may be provided at the front end of the rear portion 5b.

In order to allow the core body 5 to be discharged from the core body gripping means 2 to the outside so that it can be replaced, for example, a utility model application 61-3
As described in No. 0880, the core body gripping means 2 can be adjusted to two states, a fully expanded state and a semi-expanded state in which the core body 5 does not drop.

In the present invention, in addition to the one in which the core is housed inside the outer shaft, for example, Japanese Utility Model Publication No. 55-174385 or Japanese Patent Publication No. 49-3520.
It can also be applied to a multi-core chamber type writing instrument as disclosed in No. 8, Jitsuko Sho 51-17934 and the like.

[Advantages of the Invention] According to the present invention, the center shaft, which is connected to the core body gripping means for accommodating the writing, is always elastically arranged in the outer shaft, and serves as the tip of the core body gripping means. In a red holder type writing instrument in which the body gripping portion is made to cooperate with the tip portion of the outer shaft and the core body is housed inside the outer shaft, the core body is connected to the rear part and the front part. Then, the front part thereof is a writing part that comes into contact with the writing surface, and a locking step part is provided at the front end of the rear part or at the front part, and the locking step part is provided at the rear end of the core body gripping part. The length of the front portion is made larger than the length of the core body projecting from the rear end of the core body gripping portion, so that the connecting portion between the front portion and the rear portion of the core body is larger than the rear end of the core body gripping portion. Since it does not go to the front and is not directly subjected to the load applied during writing, it is possible to prevent damage from the joint part of the core body and play At the same time, it is possible to provide a writing instrument in which damage to the tip of the core body is prevented as much as possible.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are partial sectional views showing another embodiment. 1 ... Outer shaft, 1a ... Tip part, 2 ... Core body gripping means 2a ... Core body gripping part, 3 ... Middle shaft, 5 ... Core body 5a ... Front part (writing part), 5b ... Rear part, 5c …… Coupling part L …… Writing material

Claims (1)

[Scope of utility model registration request] 1. A center shaft connected to a core gripping means for accommodating a handwriting is always elastically arranged in an outer shaft, and a core gripping portion which is a tip end portion of the core gripping means is an outer shaft. In a red holder-type writing instrument which is configured to cooperate with the tip of the core and accommodates the core inside the outer shaft, the core is constituted by connecting the rear part and the front part, and the front part is With a writing portion that comes into contact with the writing surface, a locking step portion is provided at the front end of the rear portion or at the front portion, and the locking step portion is brought into contact with the rear end of the core body gripping portion, and A red holder type writing instrument, characterized in that the length of the front portion is made larger than the length of the core body protruding from the rear end of the core body gripping portion.