JPS629040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sharp pencil whose lead is drawn out using the natural force that grips the shaft when writing.

Although various lead feeding systems have been developed for conventional sharp pencils, each of them has various drawbacks. For example, a system in which the lead is fed out by rotating around a shaft has the disadvantage that both hands are required for operation and the length of the lead that is fed out is not constant. In addition, since the refill is inserted from the tip, the lead breaks easily and is not suitable for thin leads, so it is rarely used except for those made by some manufacturers.

The method of tapping the lead case using a knocking rod protruding from the rear end of the shaft and feeding out the lead has the advantage that the length of the lead to be drawn out is constant and it can be knocked with one hand, but it requires changing hands when knocking. It also has the disadvantage of not having to be used. Also, the knob stick protrudes from the rear end of the shaft, which is not a good design. Even in the method where a single knot plate is provided on the gripping part of the shaft and the core is fed out by holding it down (the so-called side-knock method), the plate must be pressed with one finger while supporting it with the other finger of the same hand. It is very difficult to knot because you have to use each finger in an unnatural way. Also,
While writing, you may press the notch board with your fingers, and at that time the lead becomes loose. Even in the method of feeding out the core while bending the shaft itself into a dogleg shape,
It is extremely difficult to use as it requires the application of unnatural force.

Furthermore, even in the method of drawing out the lead while pressing the tip of the writing instrument against the paper surface or other surface (the so-called tip knocking method), it is necessary to have a partner to press the lead or tip pipe against, and if the partner is soft, it will not work properly. Further, there is a drawback that the object pressed against it gets dirty or the object pressed against it gets scratched.

This invention eliminates the above-mentioned drawbacks of conventional sharp pencils with various lead feeding methods.
The purpose is to provide a sharpening pencil with a completely new lead feeding method. That is, the sharp pencil according to the present invention is designed to allow the lead to be drawn out using the natural force that grips the shaft during writing.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of the present invention, and FIGS. 2, 3, and 4 are a cross-sectional view, a cross-sectional view, and a cross-sectional view of FIG. 1, respectively. Reference numeral 1 denotes a front shaft cylinder, and a stepped portion 2 is provided on the front outer periphery of the front shaft cylinder 1, and a small diameter portion 3 with a smaller diameter is provided behind the stepped portion 2. Three axial slits 4 are formed at equal intervals behind the small diameter portion 3.

A sliding tube 5 is slidably housed in the front of the front barrel 1, and the tip pipe of the sliding tube 5 can go in and out from the front opening of the front barrel 1. A core holder 6 is installed inside the sliding tube 5, and the core holder 6 is made of an elastic material such as rubber or synthetic resin, and is designed to lightly hold the core inside at all times. There is.

A chuck 7 is inserted from the rear of the front shaft cylinder 1, and a fastener 8 is fitted on the outer periphery of the chuck 7. On the rear outer circumference of the fastener 8, there are three protrusions 9 at equal intervals.
9, 9 are formed, and the projections 9, 9, 9 fit into the slits 4, 4, 4 of the front shaft cylinder 1, respectively. Each head of the projections 9, 9, 9 slightly protrudes to the outside of the small diameter portion 3 of the front barrel 1. A ring 10 is fitted onto the outer periphery of the small diameter portion 3 from behind, and is positioned behind the projections 9, 9, 9. Front shaft cylinder 1
A cylindrical holding member 11 is fitted on the outer periphery of the holding member 11 , the front end of the holding member 11 is fixed to the front outer periphery of the front shaft cylinder 1 , and the rear end is fixed to the outer periphery of the ring 10 . Then, the presser member 11 is removed, excluding the front and rear fixed portions.
A large number of axial slits 12, 12, . . . are provided at equal intervals. The holding member 11 is made of metal, plastic, etc., and the central portion provided with the slits 12, 12, etc. is dented when pressed, but returns to its original position when the pressure is released.

By fitting the small diameter part 14 formed at the front end of the rear shaft cylinder 13 into the small diameter part 3 of the front shaft cylinder 1 from the rear and integrating it so that the overall length is constant,
A rear shaft cylinder 13 is connected to the rear of the front shaft cylinder 1. The front barrel 1 and the rear barrel 13 constitute the main body of the sharp pencil.

A core case 15 is housed in the rear barrel 13, and the rear end of the chuck 7 is screwed into the front end of the core case 15 to connect the chuck 7 and the core case 15. A stepped portion 16 is provided on the outer periphery of the core case 15.
A spring _S1 is inserted between the stepped portion 16 and the stepped portion inside the front of the rear shaft cylinder 13, and the core case 15 is
is constantly urged backward, but the core case 15
The rear end is a lid body 17 fitted to the rear end of the rear shaft cylinder 13.
Supported by An axial through hole 18 is formed in the core case 15, and an axial through hole 19 is also formed in the small diameter portion 14 of the rear shaft cylinder 13.
A long rod 20 is threaded inside. The front end of the rod 20 is placed against the rear end of the fastener 8, and the rear end is placed against the front end of a knock rod 21 inserted into a hole drilled in the lid 17. The knock rod 21 is made to protrude to the rear of the lid body 17. The through holes 18, 19, the rod 20, and the knock bar 21 are not necessarily necessary.

Next, the operating condition of the sharpening pencil shown above will be explained. When nothing is being done, the chuck 7 is pushed back by the spring S ₁ via the core case 15, but since the rear end is supported by the lid 17, it is not engaged with the fastener 8 and this Therefore, the chuck 7 is open and does not hold the lead. If, in this state, you put a cap with a clip over the tip of this sharp pencil and insert it into your pocket, the tip will be on top, so the sliding tube 5 will drop under its own weight and automatically slide into the main body. They will be detained.

When writing, the tip of the sharp pencil is downward, and at this time, the sliding tube 5 moves forward together with the lead under its own weight, resulting in the state shown in FIG. 1. When a finger presses the presser member 11 in the state shown in FIG. 1, the presser member 11 contracts inward. When the ring 10 is contracted inward, the distance between both ends is shortened, and the ring 10 is moved forward a little. ring 10
When the fastener 8 moves forward, the fastener 8 is moved forward by pushing the protrusions 9, 9, 9 of the fastener 8. Since the chuck 7 is retracted by the spring _S1 , the fastener 8
When it moves forward, it engages with the chuck 7 and clamps the core, resulting in the state shown in FIG. If writing continues in this state, the sliding tube 5 will move backward as the number of leads decreases. It is also possible to continue writing until the sliding tube 5 is completely retracted. However, when writing, people sometimes stop writing and relax their fingers for reasons such as resting their fingers, but the moment the fingers relax, the presser member 11 expands by its own restoring force and returns to its original position. As it returns, the force to press the fastener 8 is lost, and the fastener 8 is moved backward by the spreading force of the chuck head, and the fastener 8 is disengaged from the chuck 7, and the grip on the core is also released. At the moment the lead is released, the sliding tube 5, which had been retreating, takes the lead along with it via the lead holder 6 and moves forward under its own weight, returning to the state shown in FIG.

When writing, the user continues writing while holding down the presser member 11, but the lead is automatically fed out each time the grip is loosened between writing.

Note that this sharp pencil can also be used to extend the lead from the tip of the sliding tube 5 as much as desired. To make the core protrude, put more pressure on your fingers in the state shown in Figure 5, and the state shown in Figure 6 will be achieved.
The holding member 11 is further depressed, the ring 10 is moved forward a little more, and the fastener 8 is pushed, so the spring _S1 is compressed while holding the core, and the chuck 7 is also moved forward a little, and the core protrudes from the tip of the sliding tube 5. . In addition,
Each time the movement from Figure 1 to Figure 6 is repeated, the core protrudes more and more.

The mechanical pencil according to this embodiment can be operated in the same way as an ordinary mechanical pencil, but the mechanical pencil operation will be explained with reference to FIG.
Knocking the knock rod 21 allows the fastener 8 to be advanced via the rod 20. The subsequent operations are the same as those described with reference to FIGS. 1, 5, and 6. However, in this case, Rod 20
Since the ring 10 directly pushes the fastener 8, the ring 10 does not move forward, and therefore the presser member 11 does not deform. Note that in order to advance a new lead in the lead case 15 to the tip of the sliding tube 5 for the first time, you may repeat the conditions shown in Figs. 1 to 6 with the tip facing down, but normally This is done by knocking the knock rod 21. This is because the notch of the notch rod 21 allows the lead to advance a long distance with one notch.

FIG. 8 shows a second embodiment of the invention.
In the second embodiment, fasteners are provided at the front and rear of the chuck 7, respectively. That is, in addition to the fastener 8 of the first embodiment, another fastener 22 is arranged in front of the chuck 7. The fastener 22 has a cylindrical shape with a tapered tip and a collar 23 formed at the rear end. A spring S ₂ is fitted between the collar 23 and a step 24 formed inside the front barrel 1 to bias the fastener 22 in the backward direction. A stopper 25 is formed in the small diameter portion 3 to support the rear of the fastener 22. In the second embodiment, the rod 20 is not used, and when the knocking rod 21 is knocked, the chuck 7 is knocked through the lead case 15. Other configurations are the same as in the first embodiment.

In the case of the second embodiment, when the presser member 11 is pressed,
Since the fastener 8 moves forward and tightens the chuck 7 with the front fastener 22, the core can be firmly clamped even with a weak force. Knot stick 21
When the user knocks the button, the chuck 7 is pushed through the lead case 15, and the chuck 7 is tightened by the front fastener 22 to clamp the lead. At this time, the rear fastener 8 does not work. Therefore, the rear end of the presser member 11 is directly connected to the protrusions 9, 9, 9 of the fastener 8.
The ring 10 can also be omitted. Second
In the case of this embodiment as well, it is possible to make the core protrude from the tip of the sliding tube 5 by the same operation as in the first embodiment.

FIG. 9 shows a third embodiment of the invention.
In the third embodiment, the front fastener 22 is integrally formed on the inner surface of the front shaft cylinder 1. The rear shaft cylinder 13 also serves as the core case, and by inserting the rear part of the chuck 7 into an axial hole 26 provided at the front end of the rear shaft cylinder 13, the chuck 7 can be moved back and forth. When the pressing member 11 is pressed, the rear fastener 8 moves forward and tightens the chuck 7 with the front fastener 22. In the case of this third embodiment, even if the fastener 8 is moved forward, the core cannot be made to protrude from the tip of the sliding tube 5. Also, the lead cannot be drawn out due to the notch. Rear shaft cylinder 13
To carry the inserted core to the tip of the sliding tube 5, turn the tip downward without pressing the presser member 11, and the core will fall under its own weight until it hits the core holder 6. Then, hold down the holding member 11 and press the sliding tube 5.
When the tip of the slide tube 5 is pushed in, the sliding tube 5 moves back, but since the core is held by the chuck 7 and the fastener 8, it does not move, and therefore it bites into the core holder 6. Next, when the presser foot is released, the sliding tube 5 moves forward together with the core. Further, the pressing member 11 is pressed and the sliding tube 5 is pushed in. By repeating this operation, the core reaches the tip of the sliding tube.

FIG. 10 shows a fourth embodiment of the invention. The fourth embodiment is almost the same as the third embodiment, except that when the presser member 11 is pressed, it is the pusher 2 that moves forward instead of the fastener 8.
The difference is that it is 7. The pusher 27 only pushes the chuck 7; it is the front fastener 22 that tightens the chuck 7.

Note that in this fourth embodiment, the rear end of the presser member 11 and the chuck 7 are connected by some transmission means without using the pusher 27, and the presser member 11 is
It is also possible to move the chuck 7 forward through its transmission means when pressed. When the lead case 15 is connected to the rear of the chuck 7, the transmission means is provided between the rear end of the holding member 11 and the lead case 15, and when the holding member 11 is pressed, the transmission means and the lead case 15 are connected. It is also possible to move the chuck 7 forward through the shaft.

FIG. 11 shows a fifth embodiment of the invention. In the seventh embodiment, when the presser member 11 is pressed, the fastener 22 disposed in front of the chuck 7 moves back to tighten the chuck 7. That is, the rear end of the small diameter portion 3 of the front barrel 1 is fitted inside the front end of the rear barrel 13 to connect the two. Legs 3 integrally formed in the outer circumferential direction of the rear end of the fastener 22
0, 30, .

12 to 14 show a sixth embodiment of the present invention. FIG. 13 is a cross-sectional view of FIG. 12, and FIG. 14 is a cross-sectional view of FIG. In the sixth embodiment, the presser member 11 is modified. That is, a hinge is formed at a portion connecting the ring at the front end and the center presser portion, and at a portion connecting the ring at the rear end and the center presser portion, and a hinge is also formed at the center of the presser portion.
The ring at the rear end is fixed to the front end of the rear shaft cylinder 13. The small diameter part 3 of the front shaft cylinder 1 is connected to the rear shaft cylinder 1.
It is fitted onto the outer periphery of the small diameter portion 14 of No. 3, and the two are integrally connected. Three holes 31 near the front end of the small diameter portion 3,
31, 31 are spaced at equal intervals. Three recesses 32, 32, 32 are also provided at equal intervals on the front outer periphery of the fastener 8 located at the rear of the chuck 7, and the small diameter portion 3
Balls 33, 33, 33 are inserted into the respective recesses 32, 32, 32 through the holes 31, 31, 31. The outer circumferences of the balls 33, 33, 33 are located in a recess 34 formed on the entire circumference of the inner surface of the front end of the presser member 11.

A ring 35 is fitted to the rear end of the chuck 7, and a spring _S5 is fitted between the ring 35 and the step inside the front of the small diameter portion 14 of the rear shaft cylinder 13, thereby biasing the chuck 7 rearward. ing. A core case 15 is housed in the rear shaft cylinder 13, and the core case 1
5 is biased rearward by a spring _S6 .
An axial through hole 3 is provided in the small diameter portion 14 of the rear shaft cylinder 13.
6 is drilled and a rod 37 is inserted into the through hole 36. The front end of the rod 37 is in contact with the rear end of the fastener 8, and the rear end is in contact with the front end of the lead case 15.

When the presser member 11 is pressed down, the entire body expands by bending at the three hinges, so the fastener 8 is advanced via the balls 33, 33, 33,
The fastener 8 tightens the chuck 7 and can then be moved forward a little while compressing the spring _S5 . When the knock rod 21 is knocked, the fastener 8 is advanced through the lead case 15 and the rod 37, and the chuck 7 is operated in the same way.

In addition, in the examples up to the fifth embodiment, in order to accommodate the sliding tube 5 in the main body, the tip side must be facing upward, but in the sixth embodiment, a core holder is used to maintain the accommodated state. I try to keep it. That is, a ring-shaped core holder 38 is attached to the inner surface of the front shaft cylinder 1. The inner diameter of the holding member 38 is slightly smaller than the outer diameter of the rear portion of the sliding tube 5. The holding member 38 is normally made of an elastic member such as rubber or synthetic resin. Then, when the sliding tube 5 is pushed in, the holding member 38 ends up holding the sliding tube 5. In order to release the holding by the holding member 38 and move the sliding tube 5 forward, it is sufficient to simply press the holding member 11 or knock the knocking rod 21. The chuck 7 moves forward and its tip pushes out the sliding tube 5.

The six embodiments shown above include various lead feeding methods, but if we focus on the lead feeding methods and divide these examples into three, they are as follows: becomes. First, in the third, fourth, and fifth embodiments, the chuck 7 merely clamps the core when the presser member 11 is pressed. Next, when the holding member 11 is pressed down, the chuck 7 will clamp the core, and if you press it a little further in that state, the chuck 7 will move forward a little more while holding the core, causing the core to protrude from the tip of the sliding tube 5. The following examples are the first example, the second example, and the sixth example. In addition, the knob 2
The first, second, and sixth embodiments are designed so that when the button 1 is clicked, the chuck 7 can hold the lead and the lead can be protruded from the sliding tube 5 after being held.

Although various embodiments of this invention have been shown above, the embodiments of this invention are not limited to the above. For example, it is also possible to appropriately combine the techniques shown in each of the above embodiments. In any case, by pressing the holding member provided on the gripping part of the shaft main body whose overall length is constant, neither shortening nor elongating, the fastener provided inside the main body with one end in contact with the chuck head or the chuck can be tightened. It is sufficient if the chuck can be tightened by moving the pusher that presses the chuck. Any pressing member may be used as long as the space between both ends expands or contracts when pressed. Note that it is convenient to use a holding member that utilizes the principle of a lever so that the fastener, pusher, or chuck can be moved with a light force. It is also possible to provide a knurling on the surface of the presser member for a finger rest. Furthermore, it is also possible to cover the outer periphery of the presser member 11 with a thin rubber cylinder to make it easier to grip.

In order to ensure that the sliding tube quickly and reliably returns to the forward position when the holding member releases the clamping of the core, the sliding tube may be pushed by a spring. Instead of a spring, the attractive force or repulsive force of a magnet may be used.

In addition, in the embodiment shown above, the presser member itself has a restoring force, and when the presser is released, it returns to its original position due to its own restoring force, but the presser member is made to have no restoring force. It is also possible to use other forces such as springs to restore the original state.

The sliding tube may be held in the accommodated state by the holding member in any manner other than that shown in the sixth embodiment. Attach the holding member to the sliding pipe,
The sliding tube can also be maintained in the accommodated state by the engagement between the holding member and the inner surface of the main body. The material of the holding member,
The shape etc. are arbitrary. The material, shape, etc. of the portion of the sliding tube or the main body that is designed to engage with the holding member are also arbitrary.

The structure of the present invention is as described above, and the present invention has the following excellent effects.

In the sharp pencil according to this invention,
When you point the tip down to write, the sliding tube automatically or by simply pushing the chuck disengages from the holding member, and the sliding tube moves forward along with the lead under its own weight, allowing you to write. Come to a position where it is possible. Then, when the presser member is pressed, a fastener 8 provided inside the main body and having one end in contact with the head of the chuck 7 or a pusher 2 that presses the chuck 7 against the fastener 22
7 moves and engages the fastener (8 or 22) with the chuck to hold the lead, so that writing can be continued. The sliding tube retreats as the lead wears, but when the presser member is released to rest the finger during writing, the presser member returns to its original state and the fastener and chuck are disengaged. At this moment, the sliding tube moves forward automatically together with the core, and the core is fed out. While writing, the above-mentioned actions are constantly repeated. During such repeated operations, the holding member expands and contracts, but the overall length of the shaft remains constant.For example, since the front shaft cylinder and rear shaft cylinder are integral, the front shaft cylinder and When the rear barrel and the rear barrel move relative to each other, the centers of movement of both barrels do not align, so there is no core breakage, and the entire body is one piece, making it structurally stable. It is excellent in both the function of holding and drawing out the lead, and the writing function of holding the shaft firmly without wobbling, and it is also durable.

The lead will be automatically drawn out using the natural writing motion of tightening the shaft and loosening the grip while writing. In other words, the same effect as automatic lead feeding can be obtained. Therefore, the operation is extremely simple compared to other lead feeding methods, and there is no need to change hands, apply unnatural force, or touch the tip to the paper surface.

In addition, while writing, the sliding tube surrounds the outer periphery of the lead and protects it, and as the lead wears out, the sliding tube retreats and continues to protect the lead. It does not break and allows you to continue writing over long distances.

When not in use or when carrying, the lead is not clamped, so even if the sharp pencil body is subjected to shock by accidently dropping it or placing it forcefully on a desk, the impact will not be transmitted directly to the lead, so the lead will not hold. never breaks.

As in the first embodiment, the second embodiment, and the sixth embodiment, when the lead can be made to protrude from the tip of the sliding tube even after the lead is clamped, the shaft cannot be moved during writing. Since the lead is protruded little by little from the tip of the sliding tube each time the nigitsu or nigiri is loosened, an effect equivalent to the one where the lead is automatically drawn out from the tip of a lead pipe while writing is obtained. In this case, the tip of the sliding tube does not touch the paper surface, so the writing quality is good.

When the holding member is used to hold the sliding tube in the accommodated state, there is no need to use a separate cap, which is advantageous in terms of cost reduction and freedom of design selection.

In addition, in the presser members shown in the first to fifth embodiments, when operating a short stroke, it is possible to clamp the core with a strong force by simply applying a slight force to the presser member, and moreover, the presser member can hold the core with a strong force. An advantage is that the chuck can be activated by pressing only one part of the member. In addition, in the holding member shown in the sixth embodiment, since it is possible to keep holding the lead once it has been held with a small amount of force, the holding of the lead by the chuck is maintained even if the gripping force during writing is weak. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of the present invention, and FIGS. 2, 3, and 4 are a cross-sectional view, a cross-sectional view, and a cross-sectional view, respectively, of FIG. 1. FIG. 5, FIG. 6, and FIG. 7 are a longitudinal cross-sectional view of a main part, a longitudinal cross-sectional view of a main part, and a longitudinal cross-sectional view of a main part showing the operating condition of the first embodiment, respectively. FIGS. 8, 9 and 12 show the second and third embodiments of this invention, respectively.
It is a longitudinal cross-sectional view showing an example and a sixth example. FIGS. 10 and 11 are longitudinal sectional views of main parts showing a fourth embodiment and a fifth embodiment of the present invention, respectively.
13 and 14 are a sectional view and a sectional view, respectively, of FIG. 12. 1... Front shaft cylinder, 5... Sliding tube, 6... Core holder, 7
...chuck, 8, 22... fastener, 11... presser member, 13... rear shaft cylinder, 27... pusher.

Claims (1)

[Claims] 1 Sharp pencil body with constant overall length,
A presser member is arranged at the part that is gripped when writing, and when the presser member is pressed, the space between both ends expands or contracts, and one end is fixed so that it does not move toward the main body, and the other end is fixed so that it does not move toward the main body. moves forward or backward when pressed, and the other end moves a fastener provided inside the main body with one end in contact with the chuck head, or a pusher that presses the chuck against the fastener. Furthermore, the chuck, which is normally open, is tightened by moving the tightening tool or push tool, and there is also a sliding chuck fitted with a lead holder near the tip of the main body to lightly hold the lead at all times. A sharpening pencil characterized by a slidably housed tube.