JPS5852147Y2 - Notsuku style writing instrument - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a knock-type writing instrument.

Various structures are known for conventional knock-type writing instruments, but the knock part is usually formed to have an outer diameter smaller than the inner diameter of the barrel so that it can move freely back and forth within the barrel from the end of the barrel of the main body. The knock rod is protruding, or the knock part has a large diameter, but since a stroke is required to activate the feeding mechanism when knocked, the part that protrudes from the end of the barrel has a small outer diameter smaller than the inner diameter of the barrel. A section is formed.

These writing instruments have drawbacks such as a limited design and lack of smartness, and those with thin knock rods feel painful on the tip of the finger and are difficult to knock.

The present invention provides a knock type writing instrument having a knock cap with a novel structure.

FIG. 1 shows an embodiment in which the knock-type writing instrument is a mechanical pencil.

A is the main body of the writing instrument, which consists of a barrel tube 1 and an end tube 2.

Reference numeral 3 denotes a known feeding mechanism mounted inside the shaft cylinder 1, which includes a chuck 4, a chuck ring 5, a spring 6, and a knock rod 7 which also serves as a core storage cylinder.

B is a knock cap attached to the end of the main body A.

The cap B is formed by integral molding of synthetic resin such as polyethylene, rubber, etc., and is formed to close the bellows-shaped telescopic tube portion 8 with an open tip and the end portion 8' of the telescopic tube portion 8. It consists of a flat knock part 9.

In the cap B, the end part 7' of the knock rod 7 protruding from the end part 1' of the shaft cylinder is in contact with the inner part 9' of the knock part 9, and the end part 7' of the shaft cylinder 1 is in contact with the tip end 10 of the cap B. 1′
is attached to the distal end of the main body A.

In use, when the knock part 9 is knocked with the tip of a finger, the end part 7' of the knock rod 7 is in contact with the inner part 9', so the rack rod 7 is pressed down and the feeding mechanism 3 is activated.
The writing tip 11 advances toward the tip and protrudes from the tip 2' of the main body A.

At this time, the tip end 10 of the cap B is in contact with the end portion 1' of the barrel, so that as the rack rod 7 is pressed down, the telescopic barrel 8 contracts.

Next, when the hook is released, the rack rod 7 is moved by the action of the spring 6.
is raised and returned to its old position, and at the same time as the chuck 4 holds the lead 11, the expandable cylinder portion 8 of the cap B is expanded and restored to its old shape.

In order to prevent the cap B from easily falling off from the main body A during use, the cap B is attached to the inner part 9' of the knock part 9 as shown in FIG.
An engaging part 12 such as a fitting recess may be formed on the dowel rod 7 to engage the distal end 7' of the knock rod 7, or a fitting protrusion 13 may be formed on the tip 10 as shown in FIG. It may also be fitted into the distal end 1' of the barrel 1.

Also, the tip end 10 of the cap B is at the end 1' when the cap is not knapped.
Fig. 4 shows a so-called cap knock, in which the bellows-like telescopic cylinder part and the knock part are formed separately. This is an example of a type of writing instrument.

The cap B is integrally formed by connecting the end of an extensible cylindrical part 108 to the tip of a knock part 109 which is formed into a cylindrical shape with a closed end made of synthetic resin or the like by means of a tight fit or adhesive.

Further, the intermediate portion 107' of the knock rod 107 is held at the tip of the inner portion 109' of the knock portion 109 by means such as tight fitting.

The distal end 110 of the cap B is fitted and attached to the distal end 101' of the barrel 101.

When the knock part 109 is knocked, the telescopic tube 108 is contracted and the knock rod 7 is pressed down, causing the writing tip to protrude from the main body tip 101''.

In this case, unlike conventional cap knocks, the tip of the cap is not slidably fitted onto the end of the barrel, so there is no disadvantage that the tip of the cap gets stuck in the hand holding the barrel, making it difficult to knock, and it is easy to knock. There are advantages.

In addition, the intermediate part 107' of the knock rod 107 may not be held at the tip of the inner part 109' of the knock part 109, but may be loosely fitted.

In this case, if you knock the knock part 109, the telescopic cylinder 108
is contracted, and the end surface of the inner part 109' of the knock part 109 comes into contact with the end of the knock rod 107, and the knock rod 107
is pressed.

FIG. 5 shows still another embodiment.

The cap B consists of a telescopic cylindrical portion 208 that is open at both ends and a knock portion 209 that has a T-shaped cross section.

The knock part 209 has a small-diameter rod-shaped inner part 209' suspended from the axis of a large-diameter cylindrical part located at the distal end, and a tip locking part 212 is screwed into the distal end 207' of the knock rod 207. There is.

The extensible cylinder part 208 has a tip end 210 connected to the shaft cylinder 201.
', and the distal end 211 is abutted against the tip of the large diameter portion of the knock part 209 and is mounted.

When the knock part 209 is knocked, the telescopic cylinder part 208 contracts as in the previous embodiment, and the knock rod is pressed down, causing the writing tip to protrude from the main body tip 101'', and when the knock is released, it expands and restores its original shape. .

The present invention is constructed as described above, and the knock cap has a simple structure and can be integrally molded with synthetic resin, rubber, etc., and can be mass-produced, resulting in low cost.

In addition, since the telescopic cylindrical portion is formed in a bellows shape, when the knock portion is knocked, the cylindrical portion expands and contracts straight in the axial direction.

Therefore, knocking can be performed stably and easily, and there is no fear of feeling pain in the tip of the finger.

Furthermore, since the knock cap can be attached integrally with the main body, an unprecedented design is possible, and since the bellows-like telescopic tube part expands and contracts when the knock is clicked, it has the effect of stimulating the consumer's desire to purchase the product.

Furthermore, when the writing instrument is dropped, the knock cap has the effect of absorbing the impact and protecting the writing instrument.

Note that the present invention is not limited to the embodiments, and can be used in various knock-type writing instruments such as ballpoint pens, in which the writing tip is locked in a protruding state from the tip of the main body by a knock, and is recessed into the main body when the knock is released. Of course it is possible.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, and FIGS. 2 to 5 are longitudinal cross-sectional views of other embodiments of the present invention, parts of which can be omitted. A... Main body, 1,101.201...
Axial tube, 1', 101'. 201'...Terminal part, 7,107,207...
...Knock rod, 7'. 207'... End part, 107'... Middle part, B... Knock cap, 8,108,2
08...Extendable cylinder part, 9,109,209...
...Knock part, 9', 109', 209'...
-Inner part, 10, 110, 210...Tip part.

Claims (3)

[Scope of utility model registration request] (1) In a knock-type writing instrument, in which the writing tip protrudes from the tip of the main body by knocking a knock rod that is attached to the main body so that it can move forward and backward, a bellows-like extension with an open tip is provided at the end of the main body. A knock cap consisting of a cylindrical portion and a knock portion formed at the distal end of the cylindrical portion is arranged such that the knock rod is in contact with the inner side of the knock portion of the knock cap, and the distal end of the main shaft is attached to the tip of the knock cap. A knock-type writing instrument characterized by being attached so that the two are in contact with each other. (2) The knock-type writing instrument according to claim 1, wherein a locking portion is formed on the inner side of the knock portion, and the distal end of the knock rod is engaged with the locking portion. (3) The knock-type writing instrument according to claim 1, wherein the tip of the knock cap is fitted into the end of the main barrel.