JPS61235193A - Propelling pencil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a mechanical pencil whose lead is fed out by a finger pinching (pressing) operation, and in particular, by using it in conjunction with a conventional knocking operation. To provide a mechanical pencil which enables centering during initial practice and storage of the lead, lead pipe, etc. in the mouthpiece during carrying.

(Prior Art) For conventional mechanical pencils, various lead edge extension methods have been developed over the past nine years. Among them, the knock types such as rear end knock, side knock, and tip knock are superior in that they have a constant lead extension amount, can be operated with one hand, and can easily feed the next lead. It had a function.

However, this knock 2 also had a problem. For fII, in order to perform the operation of knocking and drawing out the lead little by little,
It is inconvenient to practice as they have to readjust their grip frequently, and the position of their fingers becomes fixed every time they readjust their grip, which is why younger students often use mechanical pencils to practice writing. It was frequently criticized as being inappropriate.

A so-called mechanical pencil with an automatic lead-feeding type has been developed that allows the lead to be drawn out without having to knock while writing (see Publication No. 6 of 2016-2016).
. With this one, unless the pen pressure is too high, the lead grip of the chuck that holds the lead is as weak as possible Kv! In other words, the chuck ring system is equipped with a function to easily allow the lead to move forward with extremely weak force, but to prevent it from retreating, and a lead holder that can hold the IC and the lead. Provide a slider that can move forward and backward by lightly sliding it, and keep pushing the slider in the forward direction with a spring, so that when the pen pressure applied to the tip of the slider decreases, the lead along with the slider will be pulled out of the chuck. This is a book written by

By the way, in a mechanical pencil that allows the lead to move forward but prevents the lead from moving backwards, when kneading pressure is applied to the lead, the clamping force of the chuck to grip the lead becomes sufficiently large, but on the other hand, the writing pressure When it does not touch the core, a weak but significant clamping force is always applied. In order to pull the lead out from the chuck in this state, the force of the spring that urges the slider holding the lead in the forward direction must be greater than the clamping force in the above state.) Therefore, during writing.

The drawback is that the tip of the slider presses against the paper surface due to the springing force, making writing taste poor.

In order to eliminate the above-mentioned drawbacks, the applicant has developed a mechanical pencil in which the lead is drawn out from the shaft only by the action of grasping the shaft with the fingers against writing pressure, that is, by the pinching action. (Refer to Japanese Unexamined Patent Publication No. Sho!!-/IIJ7JJ). The movement of this presser member is used to cause the chuck and fastener to move relative to each other in the axial direction. The core can be extended by conscious or unconscious movements of loosening, and
The structure is such that when the knob is loosened, the lead is released, thereby allowing the sliding tube to move forward while holding the lead under its own weight and to pull out the lead from the chuck.

On the other hand, a new lead is brought to the tip of the lead pipe by a knock, and a lead clamping mechanism is used to allow the lead to move forward and prevent it from retreating.During writing, a radial pinching force with fingers is used as a means of tabbing out the lead. , the cap part which forms a part of the shaft and has a built-in lead holder is displaced in the axial direction, and when the cap part moves back, the core is relatively drawn out from the cap, making sure that the cap part moves forward. At that time, mechanical pencils were also developed in which the lead was drawn out while the lead was held in the middle. (Refer to Japanese Unexamined Patent Publication No. 421/1999) (Problems to be Solved by the Invention) In the seventh mechanical pencil developed by the nine applicants mentioned above, the lead is held by the radial pinching force of the fingers during writing. It is designed to be held continuously, and the gripping force of the fingers is not constant while writing, so if the gripping force weakens while writing, there is a risk of the core becoming stuck. There is a fear that this may occur in the early stages of using a device due to inexperience. Also, with devices that use a sliding tube, the sliding tube may protrude out of the clasp and become a trap when carried. They often have the disadvantage that they tend to get in the way and therefore require a cap.

In addition, the No. 1 mechanical pencil developed by the applicant is
By adopting a lead clamping mechanism that allows the lead to move forward and prevents it from retreating, the above-mentioned problem during writing that occurs due to inexperience, such as the first one mentioned above, can be avoided. Since the cap is configured to be displaced in the axial direction by the radial pinching force of the fingers, there is a tendency for the cap and the shaft body to be misaligned. Therefore, there is a drawback that the lead whose tip end is held by the lead holder of the movable cap part is easily broken by the pinching operation.

The present invention eliminates the above-mentioned drawbacks of the conventional mechanical pencil, and even when the force of the fingers becomes weak during writing, the lead does not suddenly retreat and become impossible to write. The center core does not protrude too much, making it possible to easily store the pipe in the mouthpiece.Furthermore, when drawing out the core by pinching with your fingers, the center of both the mouthpiece and the shaft body can be easily stored. The technical challenge is to eliminate the fear that the core is easily broken by matching the core.

(Means for Solving the Problems) The present invention solves the drawbacks of the mechanical pencils and the above-mentioned technical problems. The other end is connected to the fastener housed inside through an engaging protrusion penetrating a slit provided with the shaft of the two bodies, and is biased to press the fastener from moving forward or backward by the pressing member. Spring 10t
- A chuck is interposed between the fastener and the main body side, and inside the fastener is provided with a chuck that is pressed backward against the fastener by a weak chuck spring /I, and the chuck is
The core case and the knock rod can be pushed forward through the friction sliding body, and the friction sliding body t-
, it is biased backward by a spring co-O and frictionally engages with the fastener, so that the fastener can also be pushed forward with a knock rod, and the mouthpiece is further equipped with a core holder. K is characterized by having an internal cap that slides firmly within the cap via an O-ring or the like and is equipped with a lead holder.

(Function) By configuring the present invention as described above, when not in use or when being carried, the sliding body and the core tab can be stored in the base by a knock.

When attempting to write, if the lead has not yet come out, the user first knocks and moves the fastener and chuck forward through the knock rod and lead case by the frictional action of the friction slide. When the fastener is prevented from advancing and the chuck moves forward relative to the fastener, when the chuck is released, the lead in the lead case falls due to gravity and hits the lead holder.

Next, when the knock is released, the friction sliding body moves to spring 2.
0, the tightening odor is due to the frictional force from the friction sliding body, and the chuck is due to the action of the spring/1, these champions are returned together, and after the fastener is prevented from retreating, the friction sliding body and the chuck are returned together. The chuck is returned and the core is held in place again. If you knock 7 more times and then stop knocking, even if the chuck is not released, when the champion returns as one, the core will be pushed out relatively forward 6. This is because the core retains its odor. This is because the chuck holds the lead with a frictional force that is smaller than the frictional force that the chuck has against the lead, so when the chuck returns to its original position, the lead continues to move forward and is placed in the 9th position. By repeating this operation several times (thus, the lead protrudes from the tip (core pipe) of the cap or internal cap, and the pen is ready for writing.

During transcribing, when the lead wears out and approaches the tip of the lead pipe, the holding member is pushed radially inward by pinching the holding member with fingers that remain in the chaining position. Then, the fastener is displaced against the spring O through the protrusion engaged with the free end of the holding member, and the chuck is also displaced while holding the core. When the presser member is released, the fastener and chuck retreat to their original positions by the force of the spring IO, but at this time,
As described above, the core remains in the advanced position (state). This is how I am writing.

The core can be freely drawn out with just a pinch of the finger.

When not in use or when being carried around, you can use a knock to advance the fasteners and chamfers, and with the core released, press the core pipe against a hard object such as a paper surface to weaken the knocking force, and the core pipe will be removed. The internal cap can also be stored within the cap.

(Implementation row) Next, embodiments of the present invention will be explained with reference to the drawings.

FIG. 1 is a side view showing a cross section of the upper half of a mechanical pencil showing a first embodiment of the present invention.

It shows the state at the time of writing. In the figure, on the main body axis l,
A plurality of slits 3 are provided around the step part 3, and a protrusion 3 extending radially inward is inserted through each slit 3 so as to be movable in the axial direction within the slit. The outer end of the ring JK is fixed to the main body shaft so as to be slidable in the axial direction, and the rear end of the ring J (right end in the figure)
is adapted to come into contact with the free end (left end in the figure) of the presser member B. The above-mentioned presser member t connects two link rods (deformable members) Am, Am in a hinged manner with a pin 6b,
The outside of the link rod is covered with a rubber ring 4c, and one end of one link rod (the right end in the figure) is locked to the stepped portion.
The other end of the other link rod (the left end in the figure) is in contact with the ring J as a free end. Therefore, by pinching the holding member +''2 radially inward with fingers, the ring J is fed forward together with the protrusion.

On the other hand, a unit cylinder 7 is installed inside the main body shaft, and a fastener t is slidably installed inside the unit cylinder 7. The unit cylinder 7 has a stopper/a provided on the main body shaft/inner surface.
and a joint 21 screwed into the inside of the base 2. Between the front end stopper 7m and the joint a, there is a spring io that urges the unit cylinder 7 rearward. is provided, and the protrusion μ is coupled to the front portion of the unit cylinder. Further, the fastener t is fitted so as to be able to slide between the front end stopper 7a of the knit tube 7 and the intermediate stopper 7b.

A chuck l is installed inside the fastener l, and a ball lj is provided between the head 13 of the chuck/- and the tapered surface llI on the inside of the fastener r.

A chuck spring /I with a weak force is interposed between the step /A of the fastener r and the rear end /7 of the chuck l, and is lightly attached to the head /3t of the chuck 12 in the constant closing direction. It is strong. This configuration serves the function of allowing the core to move forward but preventing it from retreating.

On the other hand, on the outer peripheral surface of the rear part of the fastener t, there is a core guide / a
The friction sliding body/ri is integrally equipped with a slidable exterior,
The front part of the friction sliding body 1 is divided into two or three parts so that it can be softly fitted into the unit cylinder 7.
It can slide between the intermediate stopper 7b and the rear end stopper 7c, and is biased rearward by a spring ○ provided at the core. Then, the core case 2/ is press-fitted into the friction sliding body l at the core guide/ri a portion,
The lead inside the lead case is guided along the guide surface and guided into the chuck saw. Further, a knock bar 3 is removably fitted into the rear end of the lead case 21, and an eraser 2≠ closes the entrance of the lead case inside the knock bar 3.

The base 2, which is screwed into the joint a, is firmly fitted into the interior of the base 2 so that it cannot be moved without force. (It is considered to be fixed with respect to the operation of the chuck, fastener, and unit cylinder described below.) Furthermore, a core holder 2r is press-fitted into the rear end. The holding force of the lead holder R to hold the lead kota is greater than the frictional force when pulling the lead kota forward from the chuck saw, and the fixing force of the second jaw J to the sliding roller is The core holding force of the cot is set to be sufficiently larger than the core holding force of the cot. In addition, %3 in the figure
0 indicates a protrusion for facilitating the restoration of the link rods 6m and 6m.

Next, the operating state will be explained. Fig. 1 shows the state when writing is interrupted by loosening the presser member, and the core pipe 26m integrated with the sliding roller protrudes from the base 2.
Further, a core piece protrudes from the core pipe 26m. Also, the presser member t.

The unit cylinder 7. due to the repulsive force of the spring IO. Protrusion.

ring! The reeds are restored to the state through the tightening odor,
Friction sliding body l urged backward by spring
The chuck saw is moved rearward by the frictional force of the unit cylinder 7 and comes into contact with the intermediate stopper 7bVc of the unit cylinder 7, and the chuck saw is suppressed by the chuck spring /l via the pawl /j against the fastener rK.

In this state, the lead holder is held by the lead holder ko r and the chuck/-, and the lead is in a pinched state in which it can move forward but cannot move back. Therefore, in this state, it is possible to withstand writing pressure and continue writing.

Next, in order to write, as shown in FIG. 7A, when the first presser member 6 is pinched with fingers and pressed inward in the radial direction, the presser member t is also displaced and extended in the axial direction, releasing the free member of the left link 6 member. Links that touch the ends! , the unit cylinder 7 via the protrusion
is advanced by a distance t1 against the spring 1oVC until it abuts on the joint 3, and the fastener r in contact with the intermediate stopper 7bK is advanced by the same distance, and at the same time, the chuck saw is also clamping the core via the ball 13. to move forward. At this time, the friction sliding body /P is also moved forward by the rear end stopper 7cVc of the unit cylinder. Therefore.

The distance t1 from the core pipe 26m at the tip of the internal cap-6
Only the core of the body was brought out.

Then, as I continued writing in this state, the lead wore out and the lead pipe 2
When the tip of 4m approaches the surface of the paper, loosen the pressure on the fingers that are pinching the presser member t. Then, the unit cylinder 7 is returned to the stopper /a by the repulsive force of the spring 10, and at the same time,
The holding member 6 is restored to its original shape via the protrusion and the ring J. Further, as the unit cylinder 7 retreats, the friction sliding body 7 is moved back by the spring to the position of the rear end stopper 7c that has retreated, and the frictional force causes the fastener t
is moved back, and the chuck saw is also moved back at the same time by the chuck spring /r, returning to the state shown in FIG. On this occasion,
The lead kota is held by the lead holder 2r and does not move back.

Then, when the holding member 6 is pinched again with the fingers, the core is drawn out in the same manner as described above.

Next, after writing, when retracting the internal cap roller integrated with the lead Kota and the Lead Pai Goo TM from the cap 2 and storing it inside, press the knock bar 23 and push it through the lead case 2/. The friction slide body 18 is moved forward. When the repulsive force of the spring 20 accompanying the forward movement of the friction slider is ten times greater than the force of the spring io, the unit cylinder 7 moves forward together with the fastener l and the chuck l, and the unit cylinder moves forward with the joint. 2
After abutting against the stopper 7a of the unit cylinder 7, the fastener t advances together with the chuck 12 to a position where it abuts against the stopper 7a of the unit cylinder 7. When the knocking is continued further, only the chuck 12 separates from the fastener r and is pushed forward by the lead guide/rear a, releasing the grip on the lead.

1 with this core released! , Core 2? and core pipe 2
When the tip of the 6 m is pressed against a hard surface such as a paper surface and the knocking force is weakened so that the knock rod 3 can retreat, the internal cap 2t retreats and the core is housed in the cap together with the core pipe. The state at this time is shown in FIG. 1O. Until the fastener is prevented from retreating, the core is not clamped and the core is completely stored. Note that when the spring io is stronger than the spring Q, the unit cylinder 7 is directly pressed by the fastener r and moves forward.

In addition, if you want to make the lead pipe protrude from the cap before writing, and if you want to make the lead protrude beyond the core pipe, press the knock rod 23 deeply as described above in FIG. 1B.
When the chuck saw is pushed out and further knocked to move the chuck saw forward and detached from the fastener T to release the grip on the lead, the first lead in the lead case falls by gravity to the entrance of the lead holder at. Next, when the knock rod is moved back once, the friction slider 1 is pushed back by the spring 0, the fastener 1 is also pushed back by the friction, and the chuck saw is also pushed back by the chuck spring /r, that is, the friction slider The champion of /P, fastener T, and chuck L is pushed back as one. When the fastener r hits the stopper 7, the unit cylinder 7 is moved back by the spring 10, and the lead is not returned to the chuck until it is blocked by the stopper/a. . When the knocking force is reduced to zero, the wick is clamped. In the same way as above, repeat the knocking motion several times again. After each knock, tighten the fastener T and chuck
The lead is fed out by the distance that the two move forward together, and finally the lead is fed out from the tip of the lead pipe 26. In addition, how to feed out the lead.

Of course, this can be done by pinching the presser member B, but the amount of lead that is fed out by one pinching operation of the presser member 6 is determined by the difference between the first joint a and the front surface of the unit cylinder 7, as described above. The distance t1 is the distance t1, whereas the amount of the lead drawn out by one knocking operation is the distance t1 above. , the distance t between the front end collar 7a of the unit inner cylinder and the front surface of the fastener r! Therefore, when you want to increase the amount of lead advance, such as during initial centering, you only need to perform a knocking operation. In addition, you only need to operate the knob to dispense a small amount while writing.

In addition, if the strength of the spring io is made strong, the lead will not be drawn out by the normal pinching force during memorization, so the lead will be drawn out every time you rest your finger while writing, and the lead will not be drawn out. It is possible to eliminate the negative effects of excessive exposure. Also, the spring I
The same effect as described above can also be achieved by setting the strength of Q to the minimum weak strength that is sufficient to restore the presser member section. This is because when the spring 10 is weakened in this way, even if the force is weakened to rest the finger during writing, the spring 10 is not restored and remains pressed. When a hinge-type holding member is used, even if the force of the spring 10 is strong, the pinching force required to maintain the pressed state is almost zero.

FIG. 2 is a side view similar to FIG. 1 showing the second embodiment of the present invention, and among the reference numerals shown in the drawing, the same ones as those shown in FIG. 1 are the same or similar. shall indicate the part.

In this implementation row, the ring that comes into contact with the free end of the presser member A! A protrusion integral with the spring I is attached directly to the tightening member R, and therefore a spring I for restoring the presser member 6.
O is interposed between the joint Pa of the cap and the front surface of the fastener r, and the fastener r is prevented from retreating by a stopper l fixed to the main body shaft, and the core guide/ Pa
The friction sliding body 1 is pushed backward by a spring 20 whose one end is fixed to the stopper 1, and a large diameter deformed part 20 is formed on the sliding surface with the fastener t. This embodiment differs from the first embodiment (FIG. 1) in that it forms a portion b, but is the same in other respects.

According to this implementation sequence, the amount of lead feeding by pinching the presser member t is determined by the width of the slit 3 and the maximum displacement in the axial direction of the presser member B. Knock bar jj′f: knock The amount of lead υ caused by this is the distance t between the joint 5'a and the front surface of the fastener.

Although it is different from the first embodiment, the structure is simplified because it does not include a unit cylinder.

In addition, in the above implementation row, the presser member 6 is connected to the link rod 6.
We have explained a row formed by connecting a to a chevron shape with a pin jb, but this is just a - row, which converts radial displacement into axial displacement and is given restorability. It is also possible to construct it from a flexible material. Furthermore, although the presser members described above are shown in rows extending forward, they may also be arranged to extend rearward. The holding member t shown in FIG. 3 is provided with several plate-like members 6d so as to fit around the main body/1:, the rear end is fixed to the stepped part, and the front end is fixed to the ring 3. . If you squeeze it with your fingers, the length in the axial direction will shrink and the ring J will retreat. Even in this case, the wick can be pulled out with a pinching motion.

(Effects of the Invention) As explained above, according to the present invention, the lead can be drawn out not only by pressing inward in the radial direction with the pinch of the finger during writing, but also by a knocking operation. This allows the core, core pipe, etc. that protrude from the cap to be stored in the cap during the centering operation performed before starting practice, and when carrying the device, eliminating anything that gets in the way when carrying the device. Also, even if the grip loosens due to finger fatigue while writing, unnecessary lead-out can be eliminated, so the lead will not come out too much. Also, the cap is integrated with the main body shaft. Therefore, there is no risk of the core breaking when the core is fed out by the knob operation.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a cross section of the upper half of a mechanical pencil showing the first embodiment of the present invention, Figs. FIG. 3 is a side view similar to FIG. 1 showing the second implementation row, and FIG. 3 is a sectional view of a main part showing another implementation row of the lead feeding mechanism using a knock. l...Body shaft, 3...Slit, l...Protrusion,!
... Ring, 6 ... Pressing member, 7 ... Unit cylinder, T ... Fastener, Ri ... Cap, Tato ... Joint, 10
,20...spring, /ko...chuck, /l.
・・Chuck spring, ・・Friction sliding body, /P
a... Core guide, Coto... Core case, C3... Dowel rod, Co j... Cap, roller... Internal cap, roller a.
... Core pipe, Kot... Core holder. 31...Unit cylinder.

Claims (1)

[Scope of Claims] 1. A mechanical pencil in which the radial displacement of a presser member that deforms in response to a radial pinching force is converted into an axial displacement that transmits force in the axial direction to feed out the lead, The other end of the presser member (6), which has one end locked to the main body shaft (1), is attached to the fastener (8) stored inside through a member that passes through a slit (3) provided in the main body shaft. A weak chuck spring ( 18 ) is provided, and the chuck (12) is pressed rearward against the fastener by a friction slide (19), and the chuck (12) is connected to the core case (21) and the knock rod (23) via the friction slide (19).
), and connect the friction sliding body (19) to the spring (
20) and is frictionally engaged with the fastener (8), and furthermore, a cap part is provided integrally with the main body, and this cap part has a built-in lead holder (28). Characteristic mechanical pencil. 2. The presser member (6) is attached to two link rods (6a, 6
The mechanical pencil according to claim 1, wherein the mechanical pencil (a) is formed by being hingedly connected to form a chevron shape, and a rubber ring is placed on the outside of the mechanical pencil. 3. The member passing through the slit is constituted by a protrusion (4), and the protrusion (4) is fitted inside the main body shaft (1) and extends a certain distance in the axial direction to the outside of the fastener (8). a spring coupled to a unit tube (31) displaceably fitted to the unit tube (31), engaged with the fastener (8) via the unit tube (31), and biased so as to suppress the forward movement of the fastener; A mechanical pencil according to claim 1, wherein: is provided between the unit cylinder and the mouthpiece. 4. Tighten the protrusion (4) that passes through the slit using a fastener (8).
2. The mechanical pencil according to claim 1, further comprising: a spring directly connected to the clamp and urged to suppress the forward movement of the clamp, and provided between the clamp and the mouthpiece. 5. The friction sliding body (19) is integrally provided with a core guide (19a) and has a large diameter portion (19a) formed in a part of the sliding surface with the outer peripheral surface of the fastener. Mechanical pencil as described. 6. The mechanical pencil according to any one of claims 1, 3, and 5, wherein the holding member is formed to contract in the axial direction in response to a radial force.