JPH065195Y2 - Knock type writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a knock-type writing instrument having a knock rotation mechanism.

[Prior art and its problems]

A knock-type writing instrument having a knock rotation mechanism has a vertical groove formed between a plurality of vertical ridges protruding from the inner surface of the barrel and a vertical protrusion formed on the outer peripheral surface of the barrel along the vertical groove of the barrel. A knock rotation mechanism is composed of a rotor that moves back and forth and a knock member that advances the rotor while a pressing element formed at the tip end applies a rotational force. FIG. 9 is a schematic development view showing the operation of the conventional knock rotation mechanism. First, as shown in (A), a deep vertical groove 55 is formed on the inner surface of the barrel 1.
And shallow vertical grooves 56 are alternately formed. When the pen of the refill is immersed in the barrel, the four vertical projections 31 of the rotor have deep vertical grooves 55 as shown in (B).
The eight pushers 41 of the knock member are fitted in the deep vertical groove 55 and the shallow vertical groove 56.
When a knocking operation is performed in this state, the pusher 41 pushes the vertical protrusion 31 and advances it in a state in which a rotational force is applied. Then, when the vertical protrusion 31 exits the deep vertical groove 55, the rotor slightly rotates, and as shown in (C), the vertical protrusion 31 forms a shallow vertical groove 56 in a state of covering the outlet of the shallow vertical groove 56. Engage with the leading edge of section 6. At this time, the refill pen body whose rear end is received by the rotor projects from the front end opening of the barrel, and the vertical projection 31 engages with the front end edge of the raised portion 6 to receive the writing pressure. become. When the knocking operation is performed again, the pusher 4 fitted in the shallow vertical groove 56 is pressed.
1 moves the vertical projection 31 forward a little, the rotor rotates a little, the vertical projection 31 retracts along the deep vertical groove 55, returns to the state shown in (B), and the pen body of the refill sinks into the barrel. To do.

As described above, the conventional knock rotation mechanism utilizes the deep vertical groove and the shallow vertical groove formed in the barrel to allow the rotor to move back and forth and the vertical projection to engage. Therefore, it is necessary to increase the height of the raised portion forming the vertical groove. That is,
Although the wall thickness of the shaft cylinder increases and the effective inner diameter of the shaft cylinder decreases, this may be an obstacle when using a large-capacity refill with a large outer diameter. It was necessary to increase the outer diameter of the barrel.

[Purpose of device]

In view of this, the present invention provides a large-capacity refill with a large outer diameter without increasing the outer diameter of the shaft cylinder by making the wall thickness of the shaft cylinder in the portion where the vertical groove in which the vertical projection of the rotor is fitted formed too large. An object of the present invention is to provide a knock-type writing instrument that can be used.

[Constitution of the device and its action]

According to the configuration of the present invention, a vertical groove is formed between a plurality of vertical protrusions provided on the inner surface of the shaft cylinder, and the vertical projection on the outer peripheral surface of the rotor is advanced along the vertical groove by knocking operation. When the vertical protrusion exits the vertical groove, it rotates a little and engages with the tip edge of the raised portion, and the pen tip of the refill whose rear end is received by the rotor protrudes from the tip opening of the barrel to enable writing. In the writing instrument, the vertical grooves are formed by alternately forming wide grooves and narrow grooves having the same depth and different lateral widths, and the width of the vertical protrusion of the rotor is set wider than that of the narrow groove. It is characterized in that it moves back and forth along the groove, and when it leaves the wide groove, it rotates a little and engages with the tip edge of the ridge while covering the outlet of the narrow groove.

That is, the vertical groove on the inner surface of the shaft cylinder is formed by alternately forming wide grooves and narrow grooves having the same depth and different lateral widths, and the width of the vertical protrusion of the rotor is set to be wider than that of the narrow groove. The vertical projection of the child moves back and forth along the wide groove, and can engage with the leading edge of the ridge while covering the outlet of the narrow groove. Therefore, the deep vertical groove is not required, the wall thickness of the barrel does not become so large, and it is possible to use a large-capacity refill having a large effective inner diameter and a large outer diameter.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows a capless water-based ballpoint pen. The barrel 1 is formed by joining a rear shaft 11, a front shaft 12, and a front opening 13, and an opening 16 is formed at the tip of the front opening 13.
As shown in FIGS. 2 and 3, on the inner surface of the rear shaft 11, ridges 6 having a large lateral width and ridges 62 having a small lateral width are alternately formed with a predetermined length in the longitudinal direction as the ridges 6. ing. A wide groove 51 and a narrow groove 52 are formed between the raised portion 61 having a large lateral width and the raised portion 62 having a small lateral width. This wide groove 5
1 and the narrow groove 52 have different widths but the same depth. Therefore, the heights of the raised portion 61 and the raised portion 62 are the same, and unlike the conventional case, the deep vertical groove 55 is unnecessary and it is not necessary to form the high raised portion 6, and the effective inner diameter of the rear groove 11 is increased. The refill 2 accommodated in the barrel 1 so as to be movable back and forth is a large-capacity refill having a large outer diameter and containing a large amount of ink, and the gap between the refill 2 and the inner wall of the barrel is small. The refill 2 is elastically bulged rearward by a spring 14 and its rear end face is in contact with the rotor 3.

As shown in FIGS. 6 and 7, the rotor 3 has four vertical protrusions 31 formed on the outer periphery of the lower end portion. This vertical protrusion 3
The lateral width of 1 is larger than the narrow groove 52 and smaller than the wide groove 51, and is fitted into the wide groove 51 to move back and forth. Further, the upper edge of the vertical protrusion 31 is inclined. The knock member 4 has a rear end covered with a knock cover 42, and is urged rearward by a knock spring 15. As shown in FIG. 4 and FIG. 5, at the tip of the knock member 4, eight pushers 41 protruding in the radial direction are formed. The pusher 41 is fitted into the wide groove 51 and the narrow groove 52 and moves back and forth, and its tip abuts against the upper end edge of the vertical protrusion 31 of the rotor 3, but the upper end edge of the vertical protrusion 31. Is inclined,
When the knocking operation is performed, the pressing element 41 advances the rotor 3 in a state where the rotational force is applied in a certain direction. The rotor 3 and the knock member 4 and the wide groove 51 and the narrow groove 52 constitute a knock rotation mechanism. As described below, the refill 2 is moved back and forth to move the pen body 21 out of the opening 16 of the tip 13. Let

Then, if the knock cover 42 of the knock member 4 is pressed with the fingertip from the state where the pen body 21 shown in FIG. The pusher 41 of the knock member 4 advances the rotor 3 with the rotational force applied. In this process, as shown in FIG. 8 (B), the vertical protrusion 31 of the rotor 3 is formed into the wide groove 51.
When it goes forward along with and goes out of the wide groove 51, FIG. 8 (C)
As shown in FIG. 5, the rotor 3 slightly rotates, and the vertical protrusion 31 engages with the tip edge of the raised portion 6 in a state of covering the outlet of the narrow groove 52. At this time, the pen body 21 projects from the opening 16 of the front opening 13, and the vertical projection 31 engages with the tip edge of the raised portion 6 to receive the writing pressure, so that writing is possible.

Next, in order to immerse the pen body 21 in the front opening 13,
The knock operation may be performed again. By this knock operation,
When the pusher 41 fitted in the narrow groove 52 advances the vertical projection 31 slightly and the engagement with the tip edge of the raised portion 6 is released, the rotor 3 rotates slightly and the vertical projection 31 becomes the wide groove 51. It retreats along it, and becomes the state shown in FIG. 8 (B). (However, the vertical protrusion 31 retracts along the wide groove 51 adjacent to the wide groove 51 fitted before the knocking operation.)
Returning to the state shown in FIG. 1, the pen body 21 is immersed in the front opening 13.

[Effect of device]

As described above, in the knock-type writing instrument of the present invention, the refill moves back and forth in the barrel by the knock rotation mechanism, and the pen body projects from the tip opening of the barrel. The flutes formed on the inner surface were replaced with conventional deep flutes and shallow flutes, and wide grooves and narrow grooves with the same depth and different lateral widths were used, so the wall thickness of the barrel does not become too large, It is possible to provide a knock-type writing instrument in which a large-capacity refill having a large effective inner diameter and a large outer diameter can be used.

[Brief description of drawings]

1 is a sectional view of a knock-type writing instrument, FIG. 2 is a sectional view of a rear shaft, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG.
The figure is a partial cross-sectional view of the knock member, and FIG. 5 is VV of FIG.
6 is a front view of the rotor, FIG. 7 is a sectional view taken along line VII-VII of FIG. 6, FIG. 8 is an operation explanatory view, and FIG. 9 is an operation explanatory view of a conventional example. is there. 1 ... Shaft cylinder, 11 ... Rear shaft, 12 ... Front shaft 13 ... Front port, 2 ... Refill, 21 ... Pen body 3 ... Rotor, 31 ... Vertical projection, 4 ... Knock member 41 ... Presser, 51 ... Wide groove , 52 ... narrow groove 6 ... ridge

Claims (1)

[Scope of utility model registration request] 1. A vertical groove is formed between a plurality of vertical protrusions provided on an inner surface of a shaft cylinder, and a vertical projection on an outer peripheral surface of a rotor is advanced along the vertical groove by a knocking operation. When the vertical protrusion exits the vertical groove, it slightly rotates and engages with the tip edge of the raised portion, and the pen tip of the refill whose rear end is received by the rotor projects from the tip opening of the barrel to enable writing. In the knock-type writing instrument, the vertical groove has wide grooves and narrow grooves having the same depth and different lateral widths alternately formed, and the width of the vertical protrusion of the rotor is set wider than the narrow groove. A knock-type writing instrument characterized in that the pen moves forward and backward along the wide groove, and when it exits the wide groove, it slightly rotates and engages with the tip edge of the raised portion while covering the outlet of the narrow groove.