JPH0952492A - Mechanical pencil knock cover - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To prevent suffocation even if it is accidentally swallowed when removed from a core pipe, and to prevent falling of a replacement core in the core pipe when fitted to the core pipe. Provides a mechanical pencil knock cover. A hollow cylindrical knock cover (1) is detachably attached to an open end of a lead pipe (6) for accommodating a replacement lead (7), and the head can be pressed with a finger to feed a writing lead. A hole 3 is provided in a part of the zenith plate 2, and a partition plate 4 having the same cross-sectional shape as the hole 3 is formed at a position directly below the zenith plate 3 and below the zenith plate 2 by at least the thickness thereof. The inner hole 5 is provided so as to project, and the hole 3 and the inner space 5 whose lower end is opened are opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil knock cover.

[0002]

2. Description of the Related Art The knock cover of a general mechanical pencil is designed such that the head of the knock cover is pressed by a finger in order to extend the writing core. Further, the knock cover also serves as a lid for opening and closing the open end of the lead pipe for accommodating the extra lead, and is therefore detachable from the lead pipe. Therefore, the conventional knock cover may be accidentally swallowed when it is removed from the core pipe, and there is a risk of clogging the throat and choking. Therefore, as a safety measure, a means of providing a ventilation hole in the head of the knock cover is conceivable, but there is a problem that the replacement core in the core pipe falls out through the ventilation hole.

[0003]

Therefore, the present invention can prevent suffocation even if it is accidentally swallowed when it is removed from the core pipe, and at the same time, it is attached to the core pipe and falls off of the replacement core in the core pipe. The purpose is to provide a novel knock cover that can prevent this.

[0004]

In order to achieve the above object, the knock cover of the mechanical pencil of the present invention is detachably attached to the opening end of a lead pipe for accommodating a lead lead, and its head is used for feeding the writing lead. In a hollow cylindrical knock cover that can be pressed with a finger, a hole is provided in a part of the zenith plate of its head, and at a position directly below the hole and at a position that is more than its wall thickness below the zenith plate. In this configuration, a partition plate having the same cross-sectional shape as that of the punched hole is provided on the inner side surface so that the punched hole and the inner space with the lower end opened are opened.

In addition to the above objects, a semi-cylindrical body provided with a semi-circular zenith plate and a semi-circular partition plate are provided to enable color coding of the knock cover of the present invention and improve decorativeness. It is also possible to form the provided semi-cylindrical body by dividing it, and to assemble them by uniting and locking them.

Further, in order to enhance the effect of preventing the extra lead from coming off from the knock cover, the lower surfaces of the zenith plate and the partition plate are inclined surfaces, and the open end edge portion on the center side is connected to the outer peripheral wall. It should be lower than the edges.

In addition to the above-mentioned purpose, in order to obtain the convenience that the presence or absence of an internal refill can be confirmed while the knock cover is fitted to the lead pipe, a window hole is formed in a part of the peripheral wall. It is better to open

[0008]

In the knock cover of the present invention, when removed from the core pipe, the air entering the inner space from the lower end opening passes through the vent hole communicating with the inner space to the top plate, that is, Since air is secured between the upper and lower ends, suffocation can be prevented even if it is accidentally swallowed and gets stuck in the throat.

Next, when the mechanical pencil of the present invention is fitted to the core pipe and the mechanical pencil is turned upside down,
The replacement core is received by the middle partition plate or the zenith plate, and the upper part of the hole is shielded by the middle partition plate, so that the replacement core can be prevented from falling off.

[0010]

Embodiments of the present invention shown in the drawings will be described below. First, FIGS. 1 and 2 show a first embodiment. As shown in the figure, the knock cover 1 has a hollow cylindrical shape with an open lower end, and a substantially semicircular punched hole 3 is provided at a side end portion of the zenith plate 2, and the zenith is directly below the punched hole 3. An intermediate partition plate 4 having the same shape as the punched hole 3 and parallel to the zenith plate 2 is provided at a position separated from the plate 2 by the thickness of the zenith plate 2 or more,
The inner space 5 having an open lower end and the vent hole 3 are opened to allow ventilation between the upper and lower ends.

FIG. 3 shows the knock cover 1 with the core pipe 6
It is shown in a state in which the mechanical pencil is fitted up at the opening end and the mechanical pencil is turned upside down. The replacement core 7 housed inside the core pipe 6 is received by either the middle partition plate 4 or the zenith plate 2, and since the upper part of the hole 3 is shielded by the middle partition plate 4, the replacement core 7 is replaced. There is no risk that the core 7 will fall out of the punch hole 3. In the figure, reference numeral 8 is an outer shaft.

The knock cover 1 is made of plastic and can be injection-molded by using a mold as shown in FIG. The punched hole 3 is formed by the upper core 43, and the inner space 5 is formed by the lower core 44. In the figure, reference numeral 45 is a cavity plate.

Next, FIGS. 5 to 7 show a second embodiment. The knock cover 9 is composed of a pair of left and right semi-cylindrical bodies 10 and 11 formed by being divided,
The semi-cylindrical body 10 is provided with a semi-circular zenith plate 12 and a locking projection 13, and the other semi-cylindrical body 11 is provided with a semi-circular hole 41, a partition plate 14, and a locking hole 15. It is provided and both the semi-cylindrical bodies 10 and 11 are united integrally,
In addition, the locking projections 13 are fitted into the locking holes 15 for assembly.

Next, FIGS. 8 and 9 show a third embodiment. This knock cover 16 is a design modification of a part of the knock cover 1 of the first embodiment.
7 and the lower surfaces of the partition plates 18 are inclined surfaces 19 and 20, respectively.
However, the open end edge portions 21 and 22 on the center side of each are made lower than the connection end portion 24.25 with the outer peripheral wall 23. When the knock cover 16 is turned upside down as shown in FIG. 9 to receive the replacement core 26 by the zenith plate 17 and the partition plate 18, the inclined surfaces 19 and 20 serve to replace the replacement core 26.
Has a merit that it is difficult for the refill 26 to fall over the open edge portions 21 and 22 of the zenith plate 17 and the partition plate 18 because it slides toward the peripheral wall 23. It should be noted that such inclined surfaces 19 and 20 are provided with the knock cover 9 of the second embodiment.
It is of course possible to provide them on the lower surface sides of the zenith plate 12 and the intermediate partition plate 14 in FIG.

Next, FIGS. 10 and 11 show a fourth embodiment. This knock cover 27 is a design modification of a part of the knock cover 9 of the second embodiment, and has a window hole 29 formed in a part of the peripheral wall 28. This window hole 29
Is, for example, as shown in FIG.
It can be formed by providing the notches 32 and 33 on the edge of the peripheral wall of the above, and combining the two to combine the notches 32 and 33. The window hole 29 needs to be formed at a portion that does not overlap the core pipe by protruding from the core pipe when fitted into the core pipe. The window hole 29 has an advantage that it is possible to confirm the presence or absence of a replacement core in the core pipe without removing the knock cover 27 from the core pipe. It is of course possible to provide the window hole 29 in the peripheral wall of the knock cover 1 of the first embodiment or the knock cover 16 of the third embodiment.

Next, FIGS. 12 and 13 show a fifth embodiment. This knock cover 34 is a design modification of a part of the knock cover 9 of the second embodiment, and both semi-cylindrical bodies 35 and 36 are integrally connected by a string 37. The cord 37 has an advantage that the half-cylindrical bodies 35 and 36 can be prevented from being separated and lost. Of course, it is possible to provide such a string 37 on the knock cover 27 of the fourth embodiment.

Next, FIGS. 14 to 16 show a sixth embodiment. The knock cover 38 is obtained by modifying the design of a part of the knock cover 9 of the second embodiment, and a semicircular recess 40 having the same shape as the punched hole 42 is formed on the upper surface of the zenith plate 39.
Is provided. By providing the recess 40, there is an advantage that the planar shape of the knock cover 38 is symmetrical as shown in FIG. 16 and the appearance is improved.
It is of course possible to provide such a recess 40 on the zenith plates of the knock covers 1, 9, 16, 27, 34 of the first to fifth embodiments.

[0018]

The knock cover of the present invention having the above-mentioned structure can prevent suffocation even if it is accidentally swallowed and gets stuck in the throat when it is removed from the core pipe, and it is fitted on the core pipe. In this state, it is possible to prevent the core from falling off. Further, by adopting the configuration described in claim 2, in addition to the above effect, there is an effect that the knock cover can be color-coded to improve the decorative property. Further, if the configuration according to claim 3 is adopted, the effect of preventing the core from coming off from the knock cover can be enhanced. Further, by adopting the configuration described in claim 4, it is possible to obtain the convenience that the presence or absence of the internal refill can be confirmed from the outside. Further, the knock cover of the present invention has an advantage that it can be easily manufactured by injection molding using a mold.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a state in which the core pipe is fitted and turned upside down.

FIG. 4 is a cross-sectional view of an injection molding die.

FIG. 5 is a perspective view of a second embodiment.

FIG. 6 is an exploded perspective view.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is a sectional view of a third embodiment.

FIG. 9 is a cross-sectional view in a vertically inverted state.

FIG. 10 is a perspective view of a fourth embodiment.

FIG. 11 is an exploded perspective view.

FIG. 12 is a perspective view of a fifth embodiment.

FIG. 13 is an exploded perspective view.

FIG. 14 is a perspective view of a sixth embodiment.

FIG. 15 is an exploded perspective view.

FIG. 16 is a plan view.

[Explanation of symbols]

 1,9,16,27,34,38 Knock cover 2,12,17,39 Zenith plate 3,41,42 Vent hole 4,14,18 Middle partition plate 5 Internal space 6 Core pipe 7,26 Replacement core 8 Outside Shaft 10, 11, 30, 31, 35, 36 Semi-cylindrical body 13 Locking protrusion 15 Locking hole 19, 20 Inclined surface 21, 22 Open end edge 23, 28 Circumferential wall 24, 25 Connection end 29 Window hole 32 , 33 notch 37 string 40 recess 43 upper core 44 lower core 45 cavity plate

Claims (4)

[Claims] 1. A hollow cylindrical knock cover which is detachably attached to an opening end of a lead pipe for accommodating a replacement lead and whose head can be pressed with a finger to feed a writing lead. In addition to providing a hole in a part of the above, a partition plate with the same cross-sectional shape as the hole is projected on the inner surface at a position directly below the hole and at a position that is more than the wall thickness below the top plate.
A mechanical pencil knock cover characterized by opening the hole and the inner space with the lower end opened. 2. A semi-cylindrical body provided with a semi-circular zenith plate and a semi-cylindrical body provided with a semi-circular partition plate are formed separately, and both are united and locked. The mechanical pencil knock cover according to claim 1, wherein the knock cover is assembled. 3. The mechanical pencil according to claim 1, wherein the lower surface side of the zenith plate and the partition plate is an inclined surface, and the open end edge portion on the center side thereof is lower than the connecting end portion with the outer peripheral wall. Knock cover. 4. A window hole is formed in a part of the peripheral wall,
A mechanical pencil knock cover as described in 2 or 3.