JPS5941116Y2 - ballpoint pen - Google Patents

Description

[Detailed description of the invention] The present invention relates to a ballpoint pen, and more specifically, the pen tip is directed downward so that the tip of the lead protrudes from within the ballpoint pen body for writing, and the pen tip is directed upward. The present invention relates to a ballpoint pen in which the tip of the lead can be housed within a ballpoint pen body.

Conventionally, as a type of ballpoint pen, when the tip of a lead stored in a ballpoint pen body is made to protrude from the main body, the end of the lead is engaged with an engaging stepped part provided in the main body,
It is known that this prevents the lead from penetrating into the main body so that writing can be performed.

In such a ballpoint pen, when the tip of the lead protrudes from the main body, the distal end of the lead is surely engaged with the retaining step inside the main body to prevent the lead from being recessed into the main body. There is a need.

However, with conventional ballpoint pens, when the inclination of the ballpoint pen body changes when writing, there is a risk that the end of the lead may become disengaged from the engagement step inside the main body, causing the lead to sink into the main body. It had drawbacks.

The present invention was devised in view of the above drawbacks, and by fitting a weight to the core so as to be able to freely slide and deviating the center of gravity of the weight from the axis of the core, it is possible to move the weight inside the main body when writing. The core is tilted to ensure a firm engagement between the distal end of the core and the engagement step.

The present invention will be described below with reference to the illustrated embodiment. In FIG. 1, a ballpoint pen main body 1 is composed of three members, a tip portion 2, an intermediate portion 3, and a distal portion 4, and a core 5 is housed therein.

A through hole 6 is bored at the tip of the tip 2 to receive the tip 5a of the core 5, and the inner surface of the portion of the tip 2 near the through hole 6 is used to hold the core 5 housed in the main body 1. It is formed into a smooth tapered surface so that the tip can smoothly fit into the through hole 6 along its inner surface and protrude outside.

Note that the cylindrical body portion 5b of the core 5 that stores ink has a through hole 6.
The ballpoint pen body 1 has a larger outer diameter than the inner diameter, and a stepped portion 5c between the cylindrical body portion 5b and the tip portion 5a
The core 5 is prevented from coming out of the main body 1 by coming into contact with the inner surface of the core 5.

A distal end portion 4 constituting the ballpoint pen body 1 is screwed into the intermediate portion 3, and its lower end surface is configured as a retaining step portion 7.

On the other hand, at the distal end of the core 5, as clearly shown in FIG.
A screw body 8 whose upper surface is flat is screwed into the head part 8a which can be engaged with the locking step part 1 with a larger diameter than the cylindrical body part 5b of the core 5, and the entire length of the screw body 8 is screwed together. The length between the upper surface of step portion 8a and the lower surface of step portion 5c can be adjusted.

As shown in the figure, in order to reliably maintain the engagement state between the head 8a of the screw body 8 and the engaging stepped portion 7 during writing, and to store the lead in the main body 1 in one movement when storing the lead. , core 5
A weight 9 is slidably provided on the.

This weight 9 is formed into a cylindrical shape, and has a center hole 9a formed in its shaft portion through which the core 5 can slide freely, and
It is configured to be able to slide between the head 8a and a ring-shaped stopper 10 provided at a predetermined position on the cylindrical main body 5b of the core 5.

A notch 9b is formed in a part of the weight 9 to shift the center of gravity of the weight 9 from the center hole 9a, that is, from above the lead 5, so that even if the ballpoint pen body 1 is positioned in a vertical position, Also, by tilting the core 5 with the weight 9, the engaging step portion 7
The head 8a can be reliably engaged with the head 8a, and this state can be maintained.

In order to shift the center of gravity of the weight 9 from above the core 5, a bulge is formed in a part instead of the notch 9b, or the center hole 9a is shifted from the axis of the weight 9, or a plurality of holes with different specific gravities are formed. Appropriate means can be taken, such as constructing the weight 9 from a member.

Further, the outer diameter of the weight 9 is set smaller than the inner diameter of the main body 1 in order to allow the core 50 to tilt within the main body 1.

Therefore, on the inner surface of the intermediate part 3, when the tip of the main body 1 is directed upward, a weight 9 is guided to the center of the main body 1, and thereby the end of the core 5 is moved to the center of the main body 1, and the above-mentioned engagement is carried out. For the purpose of disengaging the joint part 7 and the head 8a, the weight 9 is moved to the main body 1.
A bulge 11 is formed to guide the shaft.

Of course, the distal end side of the bulge 11 has a smooth tapered surface so that the weight 9 can be smoothly guided into the bulge 11.

The amount of bulge may be any amount that can reliably disengage the head 8a and the engagement step 7;
It is necessary to take care not to impede the engagement between the engagement step portion 7 and the engagement step portion 7.

Furthermore, it is needless to say that this bulging portion 11 does not need to be provided on the entire circumferential inner surface of the main body 1, and may be in the shape of a lip.

Furthermore, in this embodiment, as shown in FIGS. 1 and 2, the clip 12 provided on the tip side of the ballpoint pen body 1 has a plate-like body portion 12a curved along the outer peripheral surface of the body 1.
A pin-shaped locking part 12b attached to the end of the main body part 12a is slidably or swingably inserted into a hole 19 formed in the main body 1, and is prevented from being removed by a stopper 14.

In addition, a magnet 15 is provided in the hole 13, and the magnet 15 allows the main body part 12a to be brought into close contact with the main body 1 so that the clip 12 does not get in the way when writing. This prevents the clip 12 from getting caught in a handkerchief or dusty paper in a handbag.

Note that the magnet 15 may be provided at the position shown by the dotted line in FIG.

With the above configuration, if the tip of the ballpoint pen body 1 is directed downward from a state where the lead 5 is completely housed in the ballpoint pen body 1, the lead 5 will move relative to the body 1 due to the weight of the weight 9 and its own weight. The head portion 8 of the screw body 8 moves downward, and at the same time, the tip portion 5a protrudes from the through hole 6 to the outside.
a and the engaging stepped portion 7 are engaged to become ready for writing.

At this time, even if the ballpoint pen body 1 is vertical, the center of gravity of the weight 9 is shifted from the top of the lead 5, so the lead 5 can be reliably tilted and engaged with the engagement step 7. becomes.

Further, since the head 8a has a larger diameter than the cylindrical main body 5b, it can be engaged with the locking step 7 with a slight inclination, and interference between the bulge 11 and the core 5 can be avoided. It becomes easier.

Furthermore, after the head 8a and the engagement step 7 are engaged, as long as the tip of the ballpoint pen body 1 is directed downward, the engaged state will not come off even if the inclination of the body 1 is changed.

And further 1. The screw body 8 is screwed into the core 5 by a standard amount during manufacturing, but due to manufacturing errors in the main body 1 or the core 5, the engagement between the head 8a and the engagement stepped portion 7 may be impossible or insufficient. In such a case, by rotating the screw body 8 and adjusting the overall length, a complete engagement state can be easily obtained.

Next, to store the lead 5 in the main body 1, point the pen tip upward, and the weight 9 will fall along the lead 5 and fit into the bulge 11, as shown in FIG. Since the head 8a of the core 5 is forcibly moved to a position where it cannot engage with the engagement stepped portion 7,
The engagement between the two is reliably released, and the core 5 is lifted up by the body 1 due to its own weight.
stored inside.

Note that the head 8a of the screw body 8 does not necessarily have to be larger than the outer diameter of the cylindrical main body 5b, and in that case, the weight 9 can be freely removed from the core 5, so that the core 5 can be replaced easily. It becomes easier.

Further, when the dimensional accuracy of the core 5 is good and the length adjustment is not required, the screw body 8 is omitted and is directly connected to the retaining stepped portion 7 at the end of the cylindrical body portion 5b of the core 5. They may be made to match.

Further, in the above embodiment, when the tip of the main body 1 is directed upward, the weight 9 is guided to the axial center of the main body 1 to release the engagement between the engagement stepped portion 7 and the head 8a. , a bulge 11 is formed on the inner surface of the intermediate portion 3 of the main body 1;
1, by appropriately selecting the gap between the inner diameter of the main body 1 and the outer diameter of the weight 9, and the gap between the outer diameter of the head 8a and the inner diameter of the concave portion of the end portion 4 into which it falls, the main body can be formed. It is clear that the engagement step 1 and the head 8a can be disengaged by using the inner diameter of the weight 9 itself as a guide for the weight 9.

Furthermore, the present invention can of course be applied to known ballpoint pens that use magnets in the engaging portion between the core and the main body.

As described above, according to the present invention, by slidably fitting the weight to the core and deviating the center of gravity of the weight from the axis of the core, the tilt of the main body during writing can be reduced. Nevertheless, it has the effect of always stabilizing the core in the inclined position within the main body and ensuring the engagement between the distal end of the core and the retaining step.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, and Fig. 2 is a cross-sectional view showing an embodiment of the present invention.
FIG. 3 is a sectional view showing a state different from that shown in the drawings, and FIG. 3 is an enlarged sectional view showing the main parts of FIGS. 1 and 2.

Claims (1)

[Scope of utility model registration request] When the distal end of the lead stored in the ballpoint pen body is projected from the main body, the distal end of the lead is engaged with a retaining step provided in the main body to prevent the lead from retracting. A ballpoint pen, characterized in that a weight is slidably fitted to the core, and the center of gravity of the weight is offset from the axis of the core.