JPS5831318B2 - rotary writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary writing instrument whose lead is sent out by rotating the main body.

Recently, most mechanical pencils use a knock type, but the knock type has the following drawbacks.

That is, in the knock type, the lead is held by a chuck, but in order to ensure this gripping, the chuck part is designed to bite into the lead to some extent, which makes the lead easy to break.

Furthermore, the amount pushed out with each knock is fixed and cannot be adjusted, and since the lead does not rotate, it tends to wear out unevenly during writing, making it necessary to hold the main body again and rotate it.

Also, rotary writing instruments have been proposed, but in conventional ones, the leads were inserted one by one into the lead holding pipe from the tip, so if the lead became shorter, a new lead was inserted from the tip each time. It is necessary and very inconvenient to use.
It also had drawbacks such as a complicated structure.

In view of these circumstances, the present invention has a simple structure, is less likely to cause core breakage, allows the amount of feed of the core to be adjusted arbitrarily, and does not need to be replaced even when the core wears out.
To provide a writing instrument that has a rich lead protection effect and can smoothly and reliably feed out the lead.

Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings.

In FIGS. 1 and 2, 1 is a front main body, and 2 is a rear main body which also serves as a rotation operation section.

Inside the main bodies 1 and 2, a core storage tube 3 is slidably equipped at the rear, a core guide tube 4 is provided in front of the core storage tube 3, and a core protection tube 5 is provided in front of the guide tube 4. They are arranged continuously along the axial direction of the center of the main body.

The core guide tube 4 has its rear end screwed onto the core storage tube 3, and
The core protection tube 5 is rotatable and slidable, and has its tip facing forward from the tip opening of the front body 1 so as to be able to move in and out.
The rear end is inserted into the core guide tube 4.

The diameters of the core guiding tube 4 and the core protecting tube 5 are such that only one core can pass through them.

Around the core guide tube 4 in the front main body 1, a rotating mechanism is provided that holds an appropriate number of rotary bodies such as columnar rollers 6, etc. in a freely removable manner.

In the illustrated example, this rotation mechanism includes three rollers 6 arranged in parallel at equal intervals, each in contact with the inner circumferential surface of the front body 1, and held in a roller holder 7 so as to be freely removable. ing.

Each of the rollers 6 is provided with a core feeding linear body 8 having appropriate flexibility such as a piano wire.
They are arranged in a row and protrude forward from the center of the front end surface.

The roller holder 7 has an insertion hole 71 for the core guide tube 4 in the center, a notch 72 for rotatably holding each roller 6 at a predetermined location in the front, and a rear cylindrical shape. By fitting the portion 73 into the rear main body 2 in a fixed or non-rotating state and inserting it into the front main body 1 via the retaining ring 9, it can rotate integrally with the rear main body 2 with respect to the front main body 1. It is installed on.

In addition, each of the linear bodies 8 passes through a cut groove 74 provided at the tip of the roller holder 7, is bent inward as appropriate, and connects a portion near the tip to the core protection tube 5. By engaging with the inclined hole 51 provided in the peripheral wall of the core protection tube 5.
It is made to contact the inner core at a constant angle of inclination.

By fixing the tips of each of the linear bodies 8 to the tip piece 11 provided in the front main body 1, the engagement between the linear bodies 8 and the inclined holes 51 is established. The state is maintained.

The tip piece 11 is press-fitted into an internal capsule 12 housed in the front main body 1 through a rotation prevention protrusion 11a and a corresponding engagement hole 12a, and the core protection tube 5 is inserted through the center. There is.

The internal capsule 12 is rotatable by reducing frictional resistance with respect to the front main body 1, and the rear end portion is provided with a roller holder 7.
By fitting into the roller holder 7 and the tip piece 11, the roller holder 7 and the tip piece 11 are integrally connected in a rotatable state.

Further, in the illustrated embodiment, only the sending out of the core protection tube 5 at the beginning of use is performed by a knocking operation.

That is, the cap-cum-knocking operation part 13 is fitted to the rear end of the lead storage tube 3 so as to protrude to the rear of the rear main body 2,
A return spring 14 is interposed between the front end of the core storage tube 3 and the step inside the roller holder 7, and a brim-shaped edge 4a is connected to the tip of the core guide tube 4 connected to the core storage tube 3. It is placed in front of the roller holder.

Further, on the outer periphery of a predetermined rear portion of the core protection tube 5, a pressed stopper 53 facing the brim-shaped edge 4a is provided.

In addition, 15 is a resistance part such as rubber attached to the inner surface of the tip of the lead protection tube 5, which provides a moderate frictional resistance to the core inside the lead protection tube 5, and when the lead is fed out near the end. It acts to prevent natural falling.

Further, 16 is an eraser fitted to the rear end of the lead storage cylinder 3.

Next, the function of this writing instrument will be explained.

A suitable number of leads 20 are stored in advance in the lead storage tube 3, and one of them is inserted into the lead protection tube 5 through the lead guide tube 4 due to its own weight.

The core protection tube 5 is advanced in advance so that its tip protrudes from the front body 1 by a knocking operation to be described later.

In this state, when the rear main body 2 is rotated relative to the front main body 1, the roller holder 7 rotates in conjunction with this, and each roller 6... revolves along the inner peripheral surface of the front main body 1. Rotate while doing so.

Along with this, the linear bodies 8..., the core protection tube 5, the tip piece 11, and the internal capsule 12 rotate in response to the revolution of the rollers 6..., and the linear bodies 8... 5 and rotates in response to the rotation of the rollers 6 while maintaining contact with the core 20 in the core protection tube 5.

As shown in FIGS. 4 and 5, the linear body 8...
By rotating while contacting the core 20 at a constant angle of inclination, the core 20 is sent forward while being rotated.

In this way, the core 20 is rotated in proportion to the amount of rotation of the rear main body 2.
advances, and at the start of use or when the lead is exhausted, the desired amount of lead 20 is fed out steplessly by rotating the rear body 2 relative to the front main body 1.

Further, the operation of sending the core protection tube 5 to the forward position at the time of starting use, etc., is performed in a knocking manner as shown in FIG. 6.

That is, by pressing the knock operation part 13 at the rear end from the state where the lead protection tube 5 is buried in the front main body 1 as shown in FIG. 6a, the lead is stored as shown in FIG. Tube 3
The core guide tube 4 moves forward, and the core protection tube 5 is pushed and moved forward to a predetermined position.

When the pressing force is released, only the lead storage tube 3 and the lead guide tube 4 are moved back to their original positions by the spring 14, leaving the lead protection tube 5 in the forward position, allowing it to move back by the stroke of the knock operation. is maintained.

In this case, if necessary, the brim-shaped edge 4a at the tip of the core guide tube 4
By making the diameter larger than the stopper 5a of the core protection tube 5, and by making the outer circumference of the flanged edge protrude appropriately forward, the flanged edge of the core protection tube 5 is made into a linear body when a knock operation is performed. 8...
It may be arranged so that it comes into contact with and expands outward.

In this way, during the knocking operation, as the linear body 8 is expanded, it becomes free or floats up from the inclined hole 51 of the core protection tube 5 and does not come into contact with the core 20, so that the tip end By knocking downward, the core 2
0 reaches near the tip of the core protection tube due to its own weight, and when the knocking operation is subsequently released, the linear bodies 8 return to their original state and come into contact with the core 20.

Thus, at the beginning of use, the lead-out of the core 20 and the linear body 8.
... will become more convenient and reliable.

During writing, the linear body 8 presses and holds the lead from the outer periphery, thereby fixing the lead.Meanwhile, the lead protection tube 5
As the lead wears out, it recedes due to stress from the writing surface, adapting to continuous writing work.

In this case, the core protection tube 5 can rotate and move even when engaged with the linear bodies 8 .

When the lead wears out to a certain extent, the lead is sent out by rotating the rear main body 2 as described above, and after the end of the lead reaches the position corresponding to the linear body 8..., the next lead to follow is sent out. By receiving the feeding action and pushing the lead at the tip,
The core will be used without waste.

In such writing work and lead feeding work, the lead protection tube 5 and the lead guide tube 4 continuously protect the lead without separation, and the linear bodies 8... By holding and feeding the lead at a position as close as possible to the tip that receives writing pressure without damaging the lead, the effect of preventing lead breakage is enhanced.

In addition, in the writing instrument of the present invention, the roller 6 and the linear body 8
The number of rollers does not need to be three, and it is possible to feed and hold the core with one roller and linear body.

Furthermore, the mechanism for making the roller 6 revolve and rotate with respect to the front main body 1 is not limited to the illustrated embodiment; for example, the rear end of the roller holder 7 in the rotating mechanism may be extended to be exposed at the rear of the main body. It is also possible to arbitrarily change the design such that the lead storage cylinder 3 is rotated by using an operating section or by interlocking a rotation mechanism with the lead storage cylinder 3.

In the illustrated example, a cylindrical roller 6 is used as the rotating body, but instead of this, a truncated conical roller 6 may be used, for example, which contacts the inner circumferential surface of the front body in a movable manner when the holder is installed in an inclined manner. A roller, an abacus-shaped roller, a roller of an appropriate shape, or a sphere may also be used.

Furthermore, the core feeding linear body may be engaged with the inclined hole of the core protection tube while projecting linearly diagonally forward with respect to the rotating body.

The rotating body can be made of any material such as steel, plastic, or rubber, and the linear body is not limited to piano wire, but can also be made of hard rubber or other suitable materials, but it should be one that has high frictional resistance against the core. It is desirable to use

In addition, the specific structure of each part may be arbitrarily changed in design without departing from the gist of the present invention.

As described above, in the writing instrument of the present invention, when the front body is rotated from behind, the rotating body that is in contact with the inner circumferential surface of the front body around the lead guide tube rotates around its axis while revolving around it. Accordingly, the core feeding linear body connected to the rotary body rotates in the front part of the front main body while contacting the core in the core protection tube at a certain angle of inclination, and rotates the core while rotating the core. Because the structure is simple, the desired amount of lead can be freely fed out steplessly according to the amount of rotational operation, and the lead can be fed out in a follow-up manner sequentially. It can also absorb uneven wear due to

Moreover, by connecting a core feeding linear body with appropriate flexibility to a rotating body that can revolve and rotate along the inner peripheral surface of the front main body, the core can be moved smoothly and reliably. In addition to being able to feed out the lead, it does not damage the lead unlike the conventional chuck type, and since the lead can be held as close as possible to the tip where pressure is applied, the lead is less likely to break. Since the core guide tube is arranged continuously, the core is more reliably protected, and has many advantages.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the entire writing instrument, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is an exploded perspective view, and Fig. 4 is a core. FIG. 5 is an enlarged perspective view of the main part showing the relationship between the feeding linear body and the core, FIG. 5 is a partially cutaway front view of the main part showing the core feeding operation, and FIGS. It is a front view showing operation.

Claims (1)

[Claims] 1. The front main body and the rear rotation operating section are relatively rotatable, and along the central axis direction of the main body, a rotatable core protection tube is provided in the front, and a core guide tube is provided behind the core protection tube. A rotary mechanism is continuously arranged around the core guide tube in the front body, and is held in a movable manner with one or several rotating bodies in contact with the inner circumferential surface of the front body. The rotating body is mounted so as to be rotatable in conjunction with the moving operation part, and a core feeding linear body is connected to the front from the center of rotation of the rotating body, and the linear body is connected to the core protection tube. By engaging with the inclined hole provided in the peripheral wall and bringing it into contact with the core in the core protection tube at a constant angle of inclination, and rotating the rotation mechanism from the rear, the rotating body moves along the inner circumferential surface of the front main body. 1. A rotary writing instrument characterized in that the linear body is configured to send out the lead while rotating as it rolls.