JPS6213833Y2 - - 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. This invention relates to a lead holder type writing instrument that allows for easy replacement.

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 an elastic member 4, and becomes the tip of the core gripping means 2, and the core expands with its own restoring elasticity. Body grip part 2a
grips and releases the core 5 through cooperation with and release from the tip 1a of the outer shaft 1 (preferably made of a material with high abrasion resistance and impact resistance as it cooperates with the core gripping portion 2a). It was designed to liberate people. Therefore, in order to put the core stored in the outer shaft 1 (usually inside the inner shaft 3) into the writing state shown in FIG. When the elastic member 4 is compressed by pressing, 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, and the core gripping part 2a expands outward and core body 5 falls due to its own weight.
However, a stopper 6 provided at the rear of the core body 5
(fitting a metal or resin pipe to the core,
or by bulging the core body), the core body 5 protrudes outside the outer shaft 1 until it is stopped at the rear end of the core body gripping portion 2a.
After adjusting the protruding length by supporting the tip with fingers or pressing it against a desk or the like, the pressing force of the center shaft 3 is released, and the elastic force of the elastic member 4 causes the core gripping portion 2a to was made to cooperate again with the tip portion 1a of the outer shaft 1, and the core body 5 was gripped to be in a writing state. Therefore, when replacing the core due to wear or other reasons,
Although this must be done from the rear of the shaft cylinder, such a core replacement operation is possible in a case where there are multiple core chambers for housing the cores, as in the case of Utility Model Application Publication No. 174385/1985 filed by the present applicant. Compared to writing instruments with a single core chamber, multi-chamber writing instruments have a more complex structure, so they tend to break down when replacing the core, or are more troublesome to replace. There was a problem.

Therefore, the present invention solves the above-mentioned problem when replacing the core of the lead holder type writing instrument by making improvements to the knob cap attached to the rear end of the center shaft and the outer shaft, and by improving the grip on the core when the core is released. This is attempted to be resolved by changing the outward expansion state of the .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Although the accompanying drawings show a multi-core chamber type writing instrument, the present invention can also be applied to a writing instrument having a single core chamber.

A core gripping means 2 and a core gripping means 2 are disposed within the outer shaft 1.
The center shaft 3a connected to the outer shaft 1 is always resiliently repelled backward by the resilient member 4, and the core gripping portion 2a is configured to cooperate with and release from the tip 1a of the outer shaft 1. Therefore, the basic structure of the core body 5 provided with the stopper 6 at the rear for gripping and releasing is the same as the conventional one, but the following points are different in the accompanying drawings.

A suitable number of partition walls indicated by reference numeral 7 are protruded from the inner surface of the outer shaft 1, and the partition walls 7 are used to store lead bodies 5 such as colored pencil leads, refills for ballpoint pens, sharp pencils, etc. A chamber 8 is formed (see Figure 3). Further, the center shaft 3a is provided with a longitudinal core guide hole 10 which is partially opened 9, and the core chamber 8 and the hole 1 provided in the core gripping means 2 are provided.
It is designed to communicate with 1. Reference number 12
is a lid body whose rear part is attached to the rear part of the center shaft 3a, and the opening 9 of the core guide hole 10 of the center shaft 3a can be opened and closed; the lid body 12 has a recess 13;
is formed.

Reference numeral 14 is a rotating member rotatably arranged at the rear end of the outer shaft 1, and an engaging portion indicated by reference numeral 15 is provided inside the rotating member 14. By locating the portion 15 in the core guide hole 10, the rotating member 14 and the center shaft 3a are connected to each other.
The rotations of the two are combined into one. Further, a protrusion 16 is provided on the inner surface of the rotating member 14 disposed within the outer shaft 1.

Reference numeral 17 is a knock cap attached to the rear end of the center shaft 3a.
7 is provided with a notch 18 that can engage with the protrusion 16 of the rotating member 14 (see FIG. 4).

In the embodiment described above, the rotating member 14 is used to rotate the center shaft 3a and select the desired core body 5, but other means can also be used as the means for rotating the center shaft 3a. Therefore, the rotating member 14 is not necessarily required, and in this case the protrusion 16 can be formed within the outer shaft 1.

Next, the operation of the embodiment of the present invention will be explained based on the attached drawings, but the specific structure of the multi-core chamber type writing instrument is outside the gist of the present invention, and the particularly important point in the present invention is that Since this is the point of the protrusion 16 and the notch 18 of the knock cap 17, this point will be mainly discussed.

If the core body 5 does not need to be replaced, press the knock cap 17 when moving forward.
The notch cap 17 is arranged so that the notch 18 and the protrusion 16 in the outer shaft 1 are not engaged (not on the same line)
Rotate and set. When the notch cap 17 is pushed forward in this state, the notch 18
The front end of the knock cap 17, which is not provided with a lock, comes into contact with the protrusion 16 and is prevented from moving forward. That is, since the forward distance is short, the forward distance of the core gripping part 2a of the core gripping means 2 connected to the center shaft 3a is also short, and the core gripping part 2a releases its grip on the core 5. However, the outward expansion is slight, and the stopper 6 is maintained in a state that does not allow passage of the writing instrument, so that it can be used in the same manner as a known lead holder type writing instrument (see Fig. 5).

On the other hand, if the core body 5 needs to be replaced, the knob cap 17 should be pressed so that the notch 18 of the knob cap 17 and the protrusion 16 in the outer shaft 1 are engaged (on the same line) when the knob cap 17 is pushed forward. 17
Rotate and set. When the notch cap 17 is pushed forward in this state, the notch 18
is advanced until the protrusion 16 and the protrusion 16 engage with each other. That is,
The distance moved forward by the longitudinal length of the protrusion 16 or the longitudinal length of the notch 18 from the above-mentioned non-engaged state becomes longer. Therefore, the core gripping portion 2a also moves forward by a distance equal to the advancing distance of the lock cap 17, and its outward expansion becomes large enough to allow the stopper 6 of the core 5 to pass through, allowing the core 5 to be replaced. (See Figure 6).

As mentioned above, the present invention changes the expanded state of the core gripping part 2a when the knob cap 17 is pressed depending on the rotating position of the knob cap, so it has the same function as a conventionally known lead holder type writing instrument, and This has the effect that the core body can be easily replaced.

In the present invention, in the above-mentioned embodiment, the protrusion 16 was provided in the outer shaft 1 (rotating member 14), and the notch 18 was provided in the knock cap 17, but as shown in FIG. Notch 1 in rotating member 14)
8a, or a protrusion 16a may be provided on the knock cap 17, and furthermore, the shape and number of the protrusion and cutout can be selected and set as appropriate.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of main parts showing a conventional example, Fig. 2 is a longitudinal cross-sectional view showing an embodiment of the present invention, and Fig. 3 is a longitudinal cross-sectional view of main parts showing a conventional example.
Fig. 4 is an exploded perspective view of the main parts, Fig. 5 and Fig. 6 are operation explanatory diagrams, and Fig. 7 is an exploded perspective view of the main parts showing another embodiment. . 1: outer shaft, 1a: tip, 2: core gripping means,
2a: Core body gripping portion, 3a: Center shaft, 5: Core body,
6: Stopper, 16, 16a: Projection, 17: Knot cap, 18, 18a: Notch.

Claims (1)

[Scope of utility model registration request] a core gripping means and a core gripping means connected to the core gripping means;
A center shaft having a lock cap attached to the rear end thereof is disposed inside the outer shaft so as to be always resiliently rearward, and a core gripping portion, which is a tip of the core gripping means, is arranged to cooperate with the tip of the outer shaft. None, in a lead holder type writing instrument that houses a core with a stopper at the rear inside the outer shaft, a protrusion is formed on either one of the knock cap and the inside of the outer shaft, and a notch is formed on the other, and the rotation of the knob cap is improved. Due to the movement, when the protrusion and the notch become engaged when the knock cap is pressed, the core gripping part becomes an expanded state that allows the stopper to pass through, and the protrusion and the notch become disengaged. A lead holder type writing instrument in which the core grip part is in an expanded state that does not allow the stopper to pass through.