JPH0529908Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a double-knot writing instrument, in particular, the outer barrel can be used for multiple types of writing instruments, and
The present invention relates to a writing instrument that always allows writing with the first rear end notch.

Recently, when not in use, the entire writing part such as the tip is stored inside the outer cylinder, and when in use, the tip 6 is protruded from the outer cylinder by the first knob operation, and the lead is fed by the second knob operation. A double-knot writing instrument has been proposed.

However, as conventional writing implements of this type, for example, Utility Model Publication No. 46-23367, Special Publication No. 49-25848, Special Publication No. 25846-1970, Japanese Utility Model Publication No. 51-3438,
The problems disclosed in publications such as No. 34329 and Japanese Patent Publication No. 54-14524 are that existing ones are used as outer cylinders and the internal mechanisms are not compatible.

In addition, with conventional double-knot writing instruments, when the writing part is stored inside the outer cylinder, the lead delivery mechanism remains attached to the lead, which can cause the lead to protrude from the tip of the outer cylinder and cause damage to clothes or other items. There was a problem with putting it away.

This idea was made to solve the above problems, and the outer tube can be used as a different type of writing instrument, making it economical and reducing manufacturing costs, as well as leaving the lead free when the writing part is stored. The purpose is to provide writing instruments.

An embodiment of this invention will be described below based on the drawings.

In FIGS. 1 and 2 showing an embodiment of this invention, 1 is an outer cylinder, 1A is an outer tip that is removably screwed into the tip of the outer cylinder 1, and 2 is an outer tip. A pipe-shaped center shaft is inserted into the cylinder 1 removably and slidably in the axial direction. Reference numeral 3 is a core pipe slidably inserted into the center shaft 2. This core pipe 3 and the center shaft 2 A rotary cam 4 is assembled and set near the rear end of the rotary cam 4, and this rotary cam 4 integrally has a cam bar 7 extending rearward.

An inner tip 6 is removably attached to the tip of the center shaft 2 by screwing or the like, and a core delivery mechanism 8 is provided at the tip of the core pipe 3.

This lead feeding mechanism 8 includes a lead chuck 10 for core feeding that is fitted to the tip of the core pipe 3 via a connecting tube 9, and a chuck fastener that is externally fitted onto the head of the lead chuck 10 so as to be slidable in the axial direction. Attachment ring 1
1, a sleeve 12 that restricts the axial movement of the chuck tightening ring 11, a second elastic body 13 for a cushion that is elastically attached between the rear end of the sleeve 12 and the center shaft 2, and The third elastic body for the notch is fitted between the connecting tube 9 and the sleeve 12.

The rotary cam 4 is slidably housed in a cam housing 15 that is fitted into the outer periphery of the rear end of the center shaft 2 and fitted to the inner wall surface of the outer cylinder 1, and has a tip end. The rotor 16 is made up of a rotor 16 that comes into contact with the rear end of the center shaft 2, and the cam bar 7 that slides the rotor 16. Here, the core pipe 3 comes into contact with a stopper 7a at the rear end of the cam bar 7, and is lightly fitted into the inner surface of the cam bar 7.

As shown in FIG.
Rotation applying section 17 that gives a predetermined rotational periodic motion to 6
is formed.

This rotation imparting portion 17 is connected to the first and second inclined surfaces 1
7a, 17b, a rear part 17c, and a long groove 17d to form a tooth-shaped cam surface.

That is, the rotor 16 is connected to the cam storage body 15.
The rotation imparting portion 17 (first and second inclined surfaces 17a,
17b), and its meshing position is on the rear end side of the first and second inclined surfaces 17a and 17b when the center shaft 2 and the core pipe 3 are in the backward biased position, and in this state When the rotary cam 4 moves forward together with the center shaft 2 and the core pipe 3, the rotary cam 4 moves along the first and second inclined surfaces 17a,
It rotates while being guided by 17b.

A switching protrusion 16a extending in the axial direction is provided on the outer circumferential surface of the rotor 16, and rotates in mesh with the rotation imparting part 17 to cause the center shaft 2 and the core pipe 3 to protrude and retract as described later. It's starting to take action.

Further, the cam bar 7 engages with the rotor 16, and a part of the cam bar 7 is slidably inserted into the cam storage body 15, and on the other hand, a rear end knock member for performing a knock operation is provided at the rear end. Eraser holder 18
are fitted.

In the above, the center shaft 2 and the core delivery mechanism 8 at the tip
The core pipe 3, the rotary cam 4, and the eraser holder 18 constitute a unitized internal writing mechanism, and this internal writing mechanism is removably pushed into the outer cylinder 1, and when inserted, An elastic body 5 is fixedly set between the outer cylinder 1 and the center shaft 2 to urge the center shaft 2 in the backward direction and release the core feeding force of the lead feeding mechanism 8.

Next, the operation will be explained.

In the storage state of the writing section shown in Fig. 1, the center shaft 2
is urged backward by the return spring 5,
The rear end of the center shaft 2 is abutted and engaged with the rotor 16 (in this state, the rotor 16 is restricted from moving in the backward direction by the cam bar 7).

Therefore, the lead delivery mechanism 8 is in the locked state, and the lead chuck 10 is in the locked state as shown in the figure.
The core 19 is in a free state.

Therefore, in this state, eraser holder 1
When the first rear end knock is performed by pushing 8, the core pipe 3 and cam bar 7 move forward while contracting the return spring 5, and the cam bar 7 pushes the rotor 16 forward. .

As a result, the switching protrusion 16a of the rotor 16
As shown in the third figure, the long groove 1 of the cam storage body 15
7d, moves along the inclined surface 17a while rotating as shown by the dashed line, and moves to the rear section 17.
It is locked at c.

Thereby, the center shaft 2 is held in a state protruding from the outer cylinder 1 as shown in the second figure. In this series of operations, the cam bar 7 and the rotor 16 are in contact with each other and there is no knocking allowance, so the lead delivery mechanism 8 does not perform the lead delivery operation.

In the state shown in the second figure, the core pipe 3 moves rearward due to the urging force of the third elastic body 14 for the knock, and a knocking distance a is created between the rotor 16 and the cam bar 7.

Therefore, when a small knock operation is performed, only the core pipe 3 moves and normal core feeding is performed.

Next, after completing the writing, if you make a second large notch (the amount of notches that exceeds the notch amount a), first,
When a predetermined core feed is performed and the notch distance a is exceeded, the rotor 16 is moved backward by the cam bar 7. To explain this operation in detail, when the notch distance a is exceeded, the cam bar 7 presses the switching protrusion 16a of the rotor 16 that is locked to the stepped portion 17c, as shown by the dashed line in FIG. Release the engagement.

This causes the rotor 16 to rotate, and then
The internal writing mechanism is retracted inside the long groove 17d, and is housed in the outer cylinder 1 as shown in the first diagram.

Therefore, when the writing part is stored by the second knock operation, the lead feed operation is always performed, so that when the writing part is stored in the outer cylinder 1, the lead 1 is moved as shown in the fourth figure.
9 always stands out as the optimum amount for writing. Therefore, if you perform the above-mentioned first notch the next time you write, you will always be in a writable state. In FIG. 4, if the core 19 is protruding, pressing the core 19 against the paper surface will cause the core 19 to retract to the optimum amount of protrusion.

Moreover, in this invention, the central shaft 2 housed in the outer cylinder 1 and the core pipe 3 having the core delivery mechanism 8
and the tip 6 constitute the internal writing mechanism of one sharp pencil as described above, and furthermore, the protruding and retracting operations of this internal writing mechanism are performed by the rotary cam 4, and its The writing instrument can be easily assembled by simply pushing and inserting one internal writing mechanism into the outer cylinder 1, so if the internal writing mechanism is replaced with another writing instrument such as a ballpoint pen, the outer cylinder 1, rotating cam 4, etc. can be used as is for different types of writing instruments.

FIG. 5 shows another embodiment of this invention, in which the tip 6
The slider 20 is housed inside, and the return spring 5 is landed between the inner wall step 1a of the outer cylinder 1 and the protrusion 2a of the center shaft 2, and its action and effect are similar to those of the previous embodiment. In addition, writing becomes possible with the first large click operation.

The slider 20 includes a cylindrical core guide 21 through which the core 19 passes, and a friction member 22 fitted to the rear end of the core guide 21. Appropriate frictional resistance is provided to the relative movement of the pipe 3 and the inner wall of the tip 6, and writing can be performed for a long period of time with one knock.

Therefore, the internal writing mechanism protrudes from the outer cylinder 1 by the first large notch as shown in FIG.
exists, so if you make a small notch, normal core feeding will occur.

Next, after writing is finished, when a second large notch (the amount of notches that exceeds the notch distance a) is performed, a predetermined lead feeding operation is performed, and when the notch distance a is exceeded, the tip of the lead chuck 10 moves the slider 2.
0 is pushed forward, the rotor 16 is further switched, and the internal writing mechanism is housed in the outer cylinder 1.

Therefore, when the internal writing mechanism is retracted by the second knock operation, a predetermined lead feed and advance movement of the slider 20 are always performed, so that the lead 19 can always be used for writing while stored in the outer cylinder 1. Outstanding condition.

Therefore, if you perform the above-mentioned first knock the next time you write, you will always be in a writable state. In addition, if the core 19 protrudes excessively, the core 19 may be pressed against the paper surface or the like as shown in the fourth figure.

As described above, according to this invention, the lead feeding force of the lead delivery mechanism is released and the lead can be held in a free state when the writing part is stored, so if the lead protrudes from the outer cylinder when the writing part is stored, In order to retract the protruding lead into the outer cylinder, it is very easy to simply press it lightly against the paper surface, etc., without having to take the trouble of releasing the lead feeding force of the lead feeding mechanism 8 by operating the knobs one by one. The protruding core can be easily retracted into the outer cylinder with a one-touch operation, resulting in excellent usability. Therefore, damage to clothes etc. due to the core protruding outside the outer cylinder can be prevented. Furthermore, by simply using the outer cylinder and replacing the internal writing mechanism such as the core pipe 3, the writing instrument can be converted to a different type of writing instrument, which is extremely economical. Furthermore, when applied to a sharp pencil, it is always in a writable state and has extremely excellent effects such as efficient writing.

[Brief explanation of drawings]

Fig. 1 is a half-cut sectional view of a writing instrument according to an embodiment of this invention, Fig. 2 is a sectional view showing the state of writing in Fig. 1, Fig. 3 is a schematic plan view of the rotating cam, and Fig. 4. is a schematic cross-sectional view of the tip when the writing unit is stored,
FIG. 5 is a sectional view of another embodiment. 1... Outer tube, 2... Center shaft, 3... Core pipe, 4
... Rotating cam, 5 ... Elastic body, 8 ... Lead delivery mechanism, 18 ... Rear end notch member.

Claims (1)

[Claims for Utility Model Registration] (1) A pipe-shaped center shaft 2 that can be inserted into and removed from the outer cylinder 1;
A core pipe 3 having a core delivery mechanism 8 at its tip and slidably inserted into the center shaft 2, and the core pipe 3 and the rear end of the center shaft 2 are assembled and set to link these two together. a rotary cam 4 that causes the lead sending mechanism 8 to operate to send out the lead when the rear end is notched;
and a rear-end knocking member 18 that allows the core pipe 3 to be clicked via the rotary cam 4, forming an internal writing mechanism that can be inserted into and removed from the outer cylinder 1. The elastic body 5 is configured to be inserted between the outer cylinder 1 and the inner shaft 2, and to press the inner shaft 2 backward to release the core-feeding force of the core feeding mechanism 8 at the time of insertion. A writing instrument characterized by (2) A slider 20 is provided, which is slidably disposed within the tip 6 fitted to the tip of the center shaft 2 and applies relative friction to the core 19 and the inner wall of the tip 6. A writing instrument according to claim 1 of the utility model registration claim.