JPH0126476Y2 - - Google Patents

Description

[Detailed explanation of the invention] In this invention, the lead lead chuck part housed in the outer cylinder of the sharp pencil body through the elastic member moves back and forth in the axial direction to feed out the lead lead out of the outer cylinder. The present invention relates to an improvement of a writing body emitting device for a multi-lead writing instrument in which a sharp pencil body and other writing bodies are accommodated in one barrel.

Conventionally, in multi-lead writing instruments that house this type of sharp pencil body and other writing bodies in one barrel, the lead core of the sharp pencil body has a mechanism for moving these writing bodies out of the barrel. It is also necessary to consider the feeding mechanism, and various ideas have been made to realize this. However, in this type of multi-lead writing instrument, when the lead of the sharp pencil body is drawn out, the sharp pencil body is temporarily locked with its writing end exposed outside the barrel, and then the lead lead is drawn out. It is something that can be done,
It is necessary to provide a mechanism for locking the sharp pencil body with its writing end exposed outside the barrel, and a mechanism for drawing out the lead from this locked state. In addition, it goes without saying that smooth operation is desired in the feeding operation of the lead core, but as will be described in detail later, the sharp pencil body, which is the technical premise of this proposal, has a lead chuck part that is a resilient member. The lead core is held in the outer cylinder by the elastic force of the pencil and moves back and forth in the axial direction to feed the lead out of the outer cylinder. The elastic force of this elastic member is different from that of a sharp pencil because the lead chuck must not move each time it is activated, and the pressure of the writing force during writing must also be taken into consideration. The elastic force is much greater than the elastic force of the elastic member for engaging the body with the inclined surface of the rotating cam. By the way, if we look at the general tension relationship between the two, the tension inside the sharp pencil body is approximately 700 to 800 gr, whereas that of the elastic member that engages the sharp pencil body with the inclined surface of the rotating cam. The tension is generally 120-200gr. Therefore, special consideration is required to realize smooth feeding of the lead core of the sharp pencil body under such circumstances.

In this case, these writing fonts are engaged with a known rotary cam having approximately equal slopes on both the left and right sides with the top as a border, and the sharp pencil body is locked on the slope surface with which the sharp pencil body engages. A locking part;
A second inclined surface is formed on which the sharp pencil body can further slide within the range of movement that allows the lead lead to be drawn out of the outer cylinder from this locking portion toward the top, and this second inclined surface is sharpened. The sliding member of the pencil body is formed to have a gentle slope from the first slope up to the locking part, and by rotating the rotary cam to either the left or right, one of the writing bodies can be moved from the barrel opening. It is intended that the lead core of the sharpening pencil body can be moved out and retracted more smoothly by the rotational movement of the rotary cam.

Hereinafter, embodiments of the present invention will be described based on the drawings. The shaft cylinder 1 consists of a front shaft cylinder 1a and a rear shaft cylinder 1b, and the front shaft cylinder 1a is attached to a sliding case 3 which is rotatably located inside the rotary cam 2 via an inner pipe 4. The shaft cylinder 1b is attached to a connecting pipe 5 to which the aforementioned rotary cam 2 is fixed. Double shaft cylinder 1a, 1
b are press-fitted into the inner pipe 4 and the connecting pipe 5, respectively, so that they can be attached and detached as necessary. It goes without saying that the rotating cam 2 and the sliding case 3 are connected by appropriate means so that they do not separate during this attachment and detachment. As described above, both shaft cylinders 1a and 1b are relatively rotatable, and the rotating cam 2 is rotated by the rotation of both shaft cylinders 1a and 1b.
The sliding case 3 will also rotate relative to each other. The rotary cam 2 has arc-shaped sloped surfaces 7 and 8 of approximately equal length on both sides of the top 6,
A sharp pencil body 9 housed in the sliding case 3 and other writing materials such as
The ballpoint pen body 10 is engaged. The engagement structure between the inclined surfaces 7 and 8 of the rotary cam 2 and the sharp pencil body 9 and ballpoint pen body 10 housed in the sliding case 3 is as shown in FIGS. , 10 attached to the end of the sliding member 9
a, 10a are always held by the elastic force of the elastic member S,
It is urged toward the rear shaft cylinder 1b and engaged. The elastic force of this elastic member S is determined by the elastic member 2 that holds the lead chuck portion of the sharp pencil body, which will be described in detail later.
This is much smaller than the repulsive force of 0. In addition, it is preferable that the engaging surface t of the sliding member 9a of the sharp pencil body has the same angle of inclination as the inclined surfaces 7 and 8 of the rotary cam 2 as much as possible from the viewpoint of achieving smooth sliding properties. As mentioned above, the rotary cam 2 has arc-shaped sloped surfaces 7 and 8 of approximately equal length on the left and right sides of the top 6, but the sloped surface 7 with which the sharp pencil body 9 engages has the sloped surfaces 7 and 8. A locking portion 11 is formed in the middle to lock the sharp pencil body 9 once, and from this locking portion 11 toward the top 6, the lead core L of the sharpening pencil body 9 is inserted into its outer cylinder 16. A second inclined surface 7b is formed on which the sharp pencil body 9 can slide within a range of a moving distance that allows it to be drawn out (see FIG. 4).

Although the second inclined surface 7b is formed to have a relatively gentle slope, its inclination angle is formed in accordance with the inclination angle of the first inclined surface 7a. In other words, the inclination angle of the first inclined surface 7a depends on how the maximum diameter (outer diameter) of the barrel 1, the total length of the writing bodies 9, 10, the amount of movement of the writing bodies 9, 10 in the axial direction, etc. are determined. However, if we were to maintain the overall length of the cursive letters 9 and 10 and their amount of movement to a certain extent, and keep the outer diameter of the barrel 1 relatively slender, Then, the angle of inclination of the inclined surfaces 7a and 8 must be relatively steep, and in standard products, the angle of inclination is generally about 58 degrees. First inclined surface 7
If the inclination angle of a is specified as such a value,
The angle of inclination of the second inclined surface 7b is preferably about 53 degrees, but if necessary, the angle of inclination of the second inclined surface 7b should be gentler than the angle of inclination of the first inclined surface 7a. , it is sufficient that the inclination angle that allows the lead core L to be drawn out is maintained.

As mentioned above, it is preferable that the engaging surface t of the sliding member 9a of the sharp pencil body has the same inclination angle as the inclined surfaces 7a and 7b of the rotary cam 2 with which it comes into contact. FIG. 10 explains the engagement relationship between the inclined surfaces 7a and 7b of the rotary cam 2 and the engagement surface t of the sliding member 9a of the sharp pencil body. has a first inclined surface 7a and a second inclined surface 7b.
and contact portions with inclination angles that almost match each other.
t ¹ and t ² are formed. Various structures are conceivable for the contact portions t ¹ and t ² , but it is also possible to form the engagement surfaces t on different side surfaces as shown in FIG. 9, as shown in FIG. 10. One surface has a first contact portion t1 in contact with the first inclined surface ^7a of the rotary cam 2, and a second contact portion t1 in contact with the second inclined surface 7b.
A contact portion ^t2 may be formed. However, in the latter case, the second contact portion t ² is located in a place where it does not interfere with the sliding of the first contact portion t ¹ on the first inclined surface 7a. As shown in FIG. 9, it is necessary that the second contact portion ^t2 of the sliding member 9a be located in the shelf-like relief portion E formed on the first inclined surface 7a of the rotary cam. There is. In this example, since the two contact portions t ¹ and t ² are formed on one side of the engagement surface t, the sliding member 9a itself becomes compact, and the contact portions t 1 and t 2 are formed on one side of the engagement surface t. There is an advantage that vertical movement in the axial direction is relatively easily maintained upon transition to the inclined surface 7b. The reason why the sharp pencil body 9 that has reached the locking part 11 further slides on the second inclined surface 7b is because it is necessary to perform an operation for feeding out the lead core L of the sharp pencil body, but this is not a problem in the present invention. A detailed explanation will be given later along with a structural explanation of the sharpening pencil body 9 in .

The distance that the sharp pencil body 9 slides on the second inclined surface 7b is related to the amount of delivery of the lead lead L, and its stroke is determined in advance. Therefore, the amount of sliding of the sharp pencil body 9 may be controlled by an appropriate means, for example, as shown in FIGS. 5 and 6, a projection formed on the outer peripheral surface of the sliding case 3 may End surface 13a of portion 13
This may be achieved by abutting the end face 12a of the protrusion 12 formed on the inner circumferential surface of the rotary cam 2. In the figure, reference numeral 14 denotes a notch provided in the rotary cam 2, which slides on the inclined surface 8 to form the writing end 1.
It acts as a locking part for the ballpoint pen 10 when the ballpoint pen 10 is fed out from the barrel opening 15.

When the ballpoint pen body 10 engages with this notch 14, the writing state of the ballpoint pen body 10 is obtained, but in order to restrict further movement in the same direction from this state, the above-mentioned rotating cam 2 and sliding motion case 3
Each end surface 12 of the projections 12 and 13 provided in
This is due to the contact action between b and 13b.

Next, the structure of the sharp pencil body according to the present invention will be explained with reference to FIG. 8. The lead chuck portion 17 housed in the outer cylinder 16 is movable back and forth in its axial direction. Lead core chuck part 17
The tip of the cutout 17 has a tapered outer peripheral surface.
a, and is detachably connected to a lead core housing tube 18 protruding from the outer cylinder 16 at its rear end.

Reference numeral 19 denotes a tightening ring that engages with the tapered cut portion 17a of the lead-core chuck portion 17 and moves within a predetermined range, and 20 indicates a step portion 16b of the outer cylinder 16 and a step portion 17b of the lead-core chuck portion 17. By the elastic force of this elastic member 20, the lead core chuck portion 17 is urged toward the lead core storage tube 18 and accommodated in the outer cylinder 16. Ru. Note that the elastic force of this elastic member 20 is the same as that of the sharp pencil body 9.
As described above, the elastic force is much greater than the elastic force of the elastic member S for engaging itself with the inclined surfaces 7a, 7b of the rotating cam 2. 16a is a step formed on the outer peripheral surface of the tip of the outer cylinder 16,
It comes into contact with the stepped portion 15a of the shaft cylinder opening 15. C is a cap of the lead core housing tube 18, and a sliding member 9a is attached to the tip thereof.

Now, in order to obtain the writing state of the sharp pencil body 9, rotate the rear barrel 1b to the right in FIG. It is only necessary to engage the locking portion 11 (see FIGS. 2 and 7). If it is necessary to feed out the lead L in this writing state, the rear shaft cylinder 1b is further rotated in the same direction, and the sharp pencil body 9 is moved toward the top 6 so that the lead L is moved out of the outer cylinder 16. The second inclined surface 7b is slid by the amount of movement that can be extended, that is, until the end surface 12a of the projection 12 of the rotary cam 2 comes into contact with the end surface 13a of the projection 13 of the sliding case 3.
During this process, the sharpening pencil body 9 is removed from its outer cylinder 16.
The movement of the outer cylinder 16 is stopped by bringing the stepped part 16a into contact with the stepped part 15a of the shaft cylinder opening 15, but at this time,
The sliding member 9a of the sharp pencil body still moves toward the distal end of the outer cylinder 16 against the elastic force of the elastic member 20, and the lead chuck portion 17 moves integrally with the lead housing tube 18. moves forward. When the lead chuck portion 17 moves forward, the tightening ring 19 that has been engaged with the tapered cut portion 17a is disengaged, and the lead chuck portion 17 is in a state in which the lead core L is fed out to the front of the outer cylinder 16. It becomes open. At this stage, when the rear shaft cylinder 1b is rotated in the opposite direction, the elastic force of the elastic member 20 also acts on the lead core housing tube 18 that interlocks with the sliding member 9a, that is, the lead core chuck portion 17. Then, it returns to its original state, and the cut portion 17a engages with the tightening ring 19 to clamp the lead lead L that has been drawn out.

This sharp pencil body 9 forms the second inclined surface 7b.
The process of reciprocating once is regarded as one cycle, and by repeating this process multiple times, the desired length of the lead L is drawn out and the writing state thereof is realized. Note that the amount by which the sharp pencil body 9 slides on the second inclined surface 7b toward the top 6 is determined by the end surface 12 of each protrusion provided on the rotary cam 2 and the sliding case 3, as described above.
This is regulated by the contact action of a and 13a. As described above, in the process of drawing out the lead lead, the second inclined surface 7b of the rotary cam that contacts the sliding member 9a of the sharp pencil body is formed to have a gentle slope, so that the sliding member The sliding movement of 9a requires relatively little force, and the lead core feeding operation can be performed more smoothly.

Next, to explain the case of obtaining the writing state of the ballpoint pen body 10, in FIG.
b to the left to release the sharp pencil body 9 from the locking portion 11 of the rotating cam 2, and at the same time, rotate the rear barrel 1b in the same direction to rotate the sliding member 10a of the ballpoint pen body 10. What is necessary is to engage the notch 14 provided in the cam 2. At this time, the sharpening pencil body 9 is located at the flat bottom of the rotating cam 2 (see FIG. 7, 1).

As described above, the present invention is a sharp pencil body in which a lead chuck part inside an outer cylinder housed through an elastic member moves back and forth in its axial direction to feed out a lead lead, and other writing instruments. In a multi-lead writing instrument housed in one barrel, these writing bodies are moved in and out by the relative rotational movement of the front and rear barrels, and the lead of the sharp pencil body is also fed out by this rotational movement. Compared to conventional knock-type mechanisms or those that include a cap-slide type mechanism, there is no need for a knob operating member, and there is no difference in diameter between the cap and the barrel. In addition to providing a simple appearance, a considerable amount of space is also available in place of the knob actuating member, making it easy to create a composite writing instrument that uses this space to attach items with other functions. I started to be able to do it. Further, according to the present invention, the second inclined surface of the rotary cam that contacts the sliding member of the sharp pencil body is formed to have a gentle slope, so that it is held by the elastic force of the strong elastic member. The lead core chuck can now be moved back and forth in the axial direction more smoothly, and the lead core can now be fed out with relative ease.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted sectional view illustrating the writing instrument according to the present invention, Fig. 2 is a partially omitted sectional view showing the writing state of a sharp pencil body, and Fig. 3 is a partially omitted sectional view illustrating the writing state of a ballpoint pen body. 4 is a conceptual diagram illustrating the rotating cam, FIG. 5 is an explanatory diagram of the rotating cam and the rotation regulating means of the sliding case, FIG. 6 is a sectional view taken along line 5-A, and FIG. The figure is a developed view illustrating the appearance and retraction of the cursive font and the extended state of the lead lead of the sharp pencil body. Figure 8 is a sectional view illustrating the structure of the sharp pencil body of the present invention. Figures 9 and 10 are the sharp pencil body. a sliding member of the pencil body;
FIG. 6 is an explanatory diagram of the contact relationship between the rotary cam and the inclined surface. 2... Rotating cam, 3... Sliding case, 6... Top, 7, 8... Inclined surface, 7a... First inclined surface,
7b...Second inclined surface, 9...Sharp pencil body, 10...Ballpoint pen body, 9a, 10a...Sliding member, 11...Locking portion, 12, 13...Protrusion, 14...Ballpoint pen Body locking part, 16...outer cylinder, 17...lead core chuck part, 18...lead core storage tube.

Claims (1)

[Scope of utility model registration request] A sharp pencil body in which the lead chuck housed in the outer cylinder moves back and forth in its axial direction via a resilient member to feed out the lead outside the outer cylinder, and other writing instruments are compared relative to each other. These writing letters are housed in a rotatable barrel consisting of a front barrel and a rear barrel, and are fixed to the rear barrel and have inclined surfaces on both left and right sides with the top as a boundary. In a multi-lead writing instrument, one of the writing bodies is engaged by the elastic force of an elastic member, and one of the writing bodies emerges and retracts from the barrel opening when the rotary cam rotates to the left or right. A locking part of the sharp pencil body is formed in the middle of the inclined surface of the rotary cam that is engaged with, and the sharp pencil body that reaches this locking part is further moved within the range of movement distance that allows the lead lead to be drawn out toward the top. The present invention is characterized in that a second sloped surface on which the sliding member of the sharp pencil body can slide is formed, and the second sloped surface is formed to have a gentler slope than the first sloped surface on which the sliding member of the sharp pencil body reaches the locking portion. A cursive writing device for multi-lead writing instruments including sharp pencil fonts.