JPS6154995A - 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 (Field of Industrial Application) The present invention relates to a mechanical pencil whose lead is drawn out by finger operation, and in particular, the invention relates to a mechanical pencil in which the lead is drawn out by finger operation, and in particular, the lead is drawn out by utilizing the natural force of the fingers that grip the shaft when writing. This invention relates to a mechanical pencil that can be used to hold and even feed out the lead.

(Prior Art) Various lead feeding methods have been developed for conventional mechanical pencils. The main ones are the rotary type that rotates the shaft to feed out the lead, the knock rod that protrudes from the rear end of the shaft, or the cap that is placed on the rear part of the main body to knock the lead case. - Knock type that feeds out, side knock type that has a single knock plate on the grip part of the shaft and presses it to feed out the lead, and folding type that feeds out the lead by bending the shaft itself into a dogleg shape. There is a 9-type tip knock type in which the tip is fed out while pressing the writing tip against the paper or other surface, 9 types in which the tip of the shank is swung downwards, and a rotating tip type in which the tip is rotated with the tip of a finger. There was also a tip-knock type where you pressed the tip with your fingertips.

However, each of the above methods had the following drawbacks. For example, rotary types require both hands to operate and the lead length is not constant, while knock type types have a constant lead length and can be knocked with one hand, but the shaft must be re-held when knocking. First, with the side knock type, the finger supporting the shaft and one finger pressing the knock plate must be moved separately in an unnatural manner, and even with the folding type, an unnatural force is required. Furthermore, the tip knock type requires a hard object against which the core or slider (tip pipe) is pressed, and has the disadvantage that the object pressed against it may be scratched or stained.

Therefore, each of the above-mentioned conventional methods requires special operations such as requiring both hands to draw out the lead, changing the grip of the fingers, and pressing the tip of the shaft against the paper surface. In order to correct the drawbacks such as the need for a sharp lead, a so-called mechanical pencil with an automatic lead feed was developed (see Japanese Patent Application Laid-Open No. 5R-2OTT No. 6). In other words, the chuck ring system should be adjusted so that the grip of the chuck that clamps the lead is as weak as possible.In other words, the chuck ring system should be provided with a function that allows the lead to move forward easily with extremely weak force, but prevents its retreat. At the same time, provide a slider with a lead holder that can hold the lead and allow it to slide forward and backward, and keep pushing the slider in the forward direction with a spring at all times, so that when the writing pressure applied to the tip of the slider becomes small, It is designed to pull the lead out of the chuck along with the slider.

By the way, in a chuck ring system that allows the lead to move forward but prevents it from retreating, when pen pressure is applied to the lead, the clamping force of the chuck to grip the lead becomes sufficiently large, but the reverse is true. When no pen pressure is applied to the lead, the force with which the chuck holds the lead is not zero, but rather a certain amount of gripping force is always applied (this gripping state is called a half-chuck state). In this half-chuck state, the force of the spring that urges the slider in the forward direction, which holds the lead and moves forward to pull the lead out of the chuck, is:
It has to be more than anti-contrary to some extent. The tip of such a slider is in contact with the paper surface while writing with the force of its spring, and the tip of the slider is rubbing against the paper surface with a fairly strong force, so naturally the writing taste is bad, and the slider will not be able to retreat while it is able to retreat. This reduces the value of the conventional slide mechanical pencil which has a continuous writing effect.

Also, if the slider touches the paper at an angle, the scratches will be so bad that the writing will be blurred, so the writing must be done with the slider upright on the paper, which also affects the writing quality. was making things worse.

Therefore, the applicant has developed a mechanical pencil that uses a mechanism that allows the lead to move forward and prevents it from retracting, so it is not an automatic mechanical pencil that requires a slider. In order to provide mechanical pencils that do not taste bad, we
In order to do this, by using the action of forcing the shaft down against the pressure of the pen and using that action force, you can always grip the lead by gripping the shaft, and furthermore, the lead edge 9 extension function can be used. Developed a mechanical pencil that could add
No. 1733, Kimiaki Sane! l-lAr1j No. 4, *P Shoj Yoichi 62 Hiroi No., Jitsukai Shojt-sisrt No.).

These mechanical pencils have a holding member with a restoring force in the shaft main body of the gripping part of the mechanical pencil, which allows the chuck or fastener to be displaced in the axial direction by the radial gripping force of the fingers. The lever is a member bent into an arched shape, a member with a cam surface, an elastic body with one end fixed, a plate shape, a rod shape, etc., and by using the movement of these holding members,
The chuck and the fastener are configured to cause relative movement in the axial direction so that the core is clamped when the grip is grasped, and the core is released when the grip 9 is loosened.

(Problems to be Solved by the Invention) It has been found that all of the above-mentioned mechanical pencils developed by the present applicant have problems that must be solved in terms of production and use.

In other words, hold down the presser member by grasping it with your fingers, and conversely release the force of your fingers to let the presser member float and return to its original state. ), the operation of the mechanism that converts it to Since you have to increase the grip force to hold it down and activate the chuck ring mechanism, the grip force becomes quite large.
There is a major practical drawback in that the presser member must be continued to be pinched with strong force while writing.

The present invention solves the above problems and
There is a conversion mechanism that allows the force to be reduced and increases the ratio of the axial displacement of the chuck or fastener to the radial displacement iK caused by the weak pinching force.

(Means for Solving the Problem) The present invention utilizes a shaft that transmits force in the axial direction in order to move the chuck or fastener forward or backward, in order to compensate for the radial displacement of the grip member that appears and retracts in response to the radial force. The mechanism for converting the displacement into a directional displacement includes a moving member with low frictional resistance, such as one or more rollers that are in contact with the inside of the grip member and are displaced mainly inwardly in the radial direction, and a chuck or fastener. On the outside of the connected member that moves in the axial direction, two or more moving members such as rollers that are displaced in the axial direction are connected so that the inclination angle can be changed by link members that are positioned so as to be inclined in a zigzag shape with respect to each other. The present invention is characterized in that the plurality of moving members displaceable in the axial direction are connected to a chuck or a fastener.

(Function) Since the present invention is configured as described above, by pinching the knob member with fingers, a movable member such as a roller disposed in contact with the inner surface of the knob member is displaced in the axial direction. do. This axial displacement moves the radial moving end of the moving member to extend in the axial direction via the link member.

This moving end is connected to the chuck or fastener, so that the chuck or fastener is axially displaced by the axial displacement of the moving member against the axially biased spring force, and tightened. They are respectively engaged with tools or chucks to clamp the core. At this time, as the number of both moving members and links increases, the ratio of the amount of displacement in the axial direction to the amount of displacement in the radial direction can be increased. Further, the energized spring force acts on the holding member as a component force, and the influence on the pinching force can be reduced.

In addition, by loosening the gripping force of the knob, the movable member that had been extending in the axial direction is restored to its original position via the link member, as it is biased in the direction of contraction by the spring. Accordingly, the chuck or fastener also returns to its original position to release the core.

Note that when the axially moving member is configured to be connected to a chuck, the chuck moves forward at the same time as the moving member is energized in the direction of contracting and releases the engagement with the fastener. If the fastener is made movable by a certain distance, it is possible to feed out a lead of a length corresponding to that distance from the writing tip, regardless of the presence or absence of the slider.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

Figures 1 and 1 show the first part of the mechanical pencil of the present invention.
FIG. 1 is a longitudinal sectional view showing an embodiment, in which FIG. 1 shows a state in which the shaft is not pinched, and FIG. 2 shows a state in which the shaft is pinched.

In the figure, a base 2 is connected to the front part of the shaft by press-fitting, and a core pipe (sliding pipe) 3 protruding from the base λ and a core holding member made of an elastic body are provided at the front of the interior of the base λ. A slider with ingredients≠! is movably stored, and a stepped portion 2a is formed on the rear inner surface of the cap λ, with which the fastener 6 abuts toward the front. The tool holding member 7 is press-fitted and attached to the inside of the shaft l, and a chuck cylinder part a having a chuck 2 formed at the tip thereof is passed through the inner diameter side of the cylinder part 7a, and the cylinder part 7a A cylindrical body 10, which is integrally attached to the chuck cylindrical portion a via a connecting member ioa, is slidably fitted onto the outer diameter side of the chuck cylindrical portion a.

On the other hand, near the front of the shaft l, there are a plurality of knob members 13 which are swingably (tiltably) attached to the metal fittings / and pins / and 2 as shown in the enlarged view of FIG. Three knob members 13 are arranged along the circumferential surface of the shaft (Fig. 7).
A plurality of rollers /j' are axially arranged inside the shaft, bearing at right angles to the shaft, and each of these rollers /j' is supported on its shaft pin as shown in FIG. Through each link /la, /is located on both sides,
It is connected to a plurality of rollers 17 disposed on the circumferential surface of the cylinder 10 in parallel with the roller /J and radially inward, and in the connected state, each link /4 /6 /・
・Has a zigzag shape.

A plurality of rollers 17 connected to each other by links are connected to one end (the leftmost one in the figure)/
The left end position of roller 7a is limited by a stopper provided in contact with the vertical rear wall 7b of the fastener holding member 7, and the roller/7b at the other free end (the right end in the figure) is connected to the rod. 11 to the stopper l fixed on the outside of the cylindrical body 10, and the stopper l?
is always biased in the direction of contracting the axially moving member by a spring 21 interposed between the spring bearing 2Q attached to the inner surface of the shaft l. In addition, in the figure, t
is a spring that urges the fastener 6 forward, and when the grip member /J is released and the chuckter moves forward, the fastener t is held together with the chuckator as shown in Fig. λ3 is for assisting in forcibly feeding out the core by advancing the chuck cylinder portion 2a by
-2≠ is an eraser packed into the end opening of the lead case 21, λ! shows a cap for knocking the chuck through the lead case 23 and the chuck cylinder portion a while covering the eraser 2≠.

Figure 6 shows the above roller/! , /7 is an enlarged partial cross-sectional plan view showing a connection structure of links directly connected to each other.

Figure 7 is a cross-sectional view taken along the line ■-■ in Figure 1, showing dust.

Three knob members 13 are arranged in the circumferential direction.

Each knob member /3 is a metal fitting /a (not shown in Fig. 7)
The knob member /3 is rotatably supported by a pin /2 (also not shown in the figure), and each knob member /3 has two % /2 plates facing radially inward as shown in the figure. j a
, / J a, and the ronilla is, i'y and the link member 16 shown in FIG. 6 are attached inside thereof.

Next, the operating state of the mechanical pencil configured as described above will be explained. FIG. 1 shows a state in which writing is interrupted by loosening the knob, and the Ronia 17 is axially contracted toward the left in the figure by the force of the spring 21, and the knob member is accordingly compressed in the axial direction. 13 has been restored to its original position, and at the same time, the chuckor is also pressed in the same direction (to the left in the figure), and the engagement with the fastener 6, which is being pushed forward by the spring t, is released. The chuck is completely open, and as shown in the enlarged figure ≠, the lead is completely released from the chuck, so the lead roller is still held in the lead holder and the slider is under its own weight. The core pipe is allowed to protrude from the base λ, and the core held in the lead holder by the distance traveled by the protrusion is pulled out from the chuck. (FIG. 1 shows this state.) Next, when writing, as shown in FIG. 2, when you pinch the grip member 13 with your fingers and press it radially inward, the grip member 13 becomes pinned. /A roller that swings around λ and touches the inside/! It is suppressed inward in the radial direction of the plane. Then, as shown in the operation explanatory diagram of FIG. 1, the roller 17 resists the forward biased spring U/ through the link 16, and moves to the free end as shown by the broken line. Move axially to the right in the diagram. At this time, the component force f exerted by the axial drag force F by the spring 21 on the leakage member is f=-2
F tan θ (θ is the inclination angle of the link member with respect to the horizontal plane). As the θ angle becomes smaller, the drag force applied to the knob member becomes smaller. As described above, the rod l/, stopper/P, and cylinder i attached to the free end roller 17b are
Since the chuckator is pushed axially rearward through the o1 connecting member io, the chuckator retreats together with the fastener 6 via the ball l≠, and the fastener 6 is pushed back by the spring ♂
is pressed against the vertical rear wall 7b of the fastener holding member 7 against the
It fits with the chuck and clamps the core 2B. Therefore, even if you continue writing in this state, the lead will not slip.

While writing, the lead pipe 3 retreats as the lead wears out, so writing continues until the lead pipe 3 retreats to near the tip of the mouthpiece 2.

When you want to draw out the lead to continue writing, or when you want to rest your fingers from time to time in the middle of writing, you can immediately return to the state shown in Figure 1 by relaxing your strained fingers. At that time, the core Jj can be reeled out by the distance L (Fig. 3) that the chuck and the fastener t move forward together, as shown in Fig. 3, for example.

Incidentally, in order to feed out the lead in the lead case 23 to the state shown in FIG. 1, do as follows. When the cap 2 is turned downward without pinching the presser member 13, only one core in the lead case 23 falls, passes through the chuck cylinder part a, passes through the completely open chuck holder, and is removed. It stops when it hits the opening at the rear end of the elastic core holding member, which has an inner diameter slightly smaller than the diameter of . In this state, if you repeat the operation of pinching and releasing the presser member several times, the core will be drawn out each time as described above (Figure 1).
, further protrudes from the tip of the core pipe 3. or,
As mentioned above, with the lead in contact with the opening of the lead holding member≠ and stopped, pinch the presser member and hold the lead,
When the lead pipe 3 of the slider is pressed onto a piece of paper while holding the lead, the lead moves forward relative to the lead holding member, and then when the holding member is released, the slider falls and moves the distance. The lead will be pulled out of the chuck by that much, so if you repeat this operation, you can quickly get to the state shown in Figure 1.

Fig. 7.2 is a cross-sectional view of main parts showing different embodiments of the present invention, and among the reference numerals shown in this figure, Fig. 1 and 2 are
The same reference numerals as shown in figures and reference figures indicate the same or similar parts. In this embodiment, the rod /l attached to the free end row 9/7b and the cylinder 10
A third spring 31, which faces the spring support 30 and the spring-1, is interposed between the spring stopper ty attached to the spring-1.

According to this embodiment, when the grip member is pressed and the chuckor is pulled rearward (to the right in the figure) to clamp the core, the roller 17b on the free end side is always moved by the λth spring J/. Since you are pulling the chuckter backwards, even if the force of your fingers pressing the grip member becomes slightly weaker during writing, the fastener will not collide with the vertical rear wall 7b of the fastener holder via the chucka. Therefore, the state in which the core is completely clamped is reliably maintained. (Without this second spring, if the gripping fingers loosen slightly, the chuck will move forward even slightly, creating the possibility of the core slipping.) Note that the second spring 31
The force applied to the finger does not increase with the addition of .

In the above-mentioned embodiment, an example was described in which the radial displacement of the grip member is changed to an axial displacement and the axial displacement is used to move the chuck. (I) In this type of mechanical pencil, Since the relative axial displacement between the chuck and the fastener is the basis for clamping the lead and feeding out the lead, as shown in FIG. Of course, it is also possible to use it for moving a fastener instead of a chuck. Note that this type of change is applicable to the above-mentioned Japanese Patent Application Publication No. 2003-120002 (for moving the fastener) and the Japanese Patent Application Publication No. 2003-111001 filed by the present applicant. t-2/j It is also described in No. 6 (something that moves the chuck). When moving this fastener, in FIG. 13, when the knob member 13 is not pressed, the fastener 6 is moved by the spring
1a to the rear, and releases the chuck and clasp. (It is prevented from retreating by the stopper ξ 〇.) When pinched, the fastener 6 is pressed forward (toward the mouthpiece) against the spring 2/a and engages with the chucktor to clamp the core. It is configured as follows.

(11) As a means for converting radial displacement into axial displacement, an example has been described in which a link mechanism hinged to a roller is used, but when the knob member is pressed, both rotors and 17 are aligned. In order to prevent loss of restorability if they are lined up on a line, a raised bottom lOb is provided on the cylindrical body io, as shown in FIG. However, by changing the diameter of both ends -2, such as making the diameter of roller /j larger than the diameter of roller 17, it is possible to prevent the rings from being aligned in a straight line when pressing, so the raised bottom 10b can be eliminated. I can do it.

QiD In addition, a hinge made by bending a wire rod and integrating the link 3j or 36 and the moving member without using a roller (Figs. 1 a and 6), or two ring plates J j', J A/ joined with a hinge (
(Fig. 10), or each zigzag-shaped link rod 6 is connected by a flexible member capable of bending and stretching movement, and a curved surface B is provided on the upper or lower surface of each connecting part to reduce sliding resistance. It is also possible to change it to something similar (Fig. 11).

QXj In addition, although the description has been made regarding the knob member having a hinged rear end, it is also possible to construct the knob member from a flexible material or the like so that the entire knob member is retracted. Of course, the number of members is not limited to three.

(S/) Also, although we have described an example in which a ball is interposed between the chuck and the fastener, the ball may not be provided, and an example in which a slider is provided has been described, but it is also possible to provide an example in which a slider is not provided. Of course, it is also possible to apply the invention.

(Effects of the Invention) As explained above, according to the present invention, by providing a plurality of gripping members, and by providing a plurality of moving members and link members, the shaft of the mechanical pencil can be easily moved with a small amount of finger force. By pinching, the radial displacement is efficiently converted into a large axial displacement, so the core can be pinched smoothly and reliably.

The core can be fed out, and by loosening or releasing the knob on the shaft, the grip on the lead can be quickly and reliably released and the lead can be fed out further.
What's more, you only need to use a gentle amount of pressure to grip the shaft while writing, so your hands won't get tired.

[Brief explanation of the drawing]

1 and 4 show the first mechanical pencil of the present invention.
FIG. 3 is an explanatory view of the main part, FIG. 3 is an enlarged sectional view of the main part of FIG. 1, FIG. Fig. 6 is a partially sectional plan view showing the connection structure of the roller and link member, Fig. 7 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 6 is an explanatory diagram showing the operating state of Fig. 6. Figures a, Fb, Figure 10, and Figure 1/Figure are explanatory diagrams showing different embodiments of changing radial displacement into axial displacement;
FIG. 12 is a sectional view of a main part showing a different embodiment of a spring that urges the axially moving member in a direction to contract, and FIG. 1J is a longitudinal sectional view showing a second embodiment of the present invention. l... shaft, λ... cap,! ...Slider, 6...
・Fastener, 2...Chuck, lQ...Cylinder, //...
・・Body shaft, /J・Knob member, /J, /7・
...Moving member, roller, 16...Link member, 21,
2/a...Spring. Seventh cause procedural amendment (voluntary) October 18, 1982

Claims (1)

[Claims] 1. Converting the radial displacement of the grip member that moves in and out in response to a radial force into an axial displacement that transmits force in the axial direction to move the chuck or fastener forward or backward; In a mechanical pencil in which a lead is held and released by engaging and disengaging a chuck and a fastener, one or more pieces are in contact with the inside of the grip member and are displaced inwardly in the radial direction. A movable member and two or more movable members that are elastically biased in the direction of contraction and are displaceable in the axial direction on the outside of the member that is coupled to a chuck or a fastener and are movable in the axial direction are tilted to each other in a zigzag shape. 1. A mechanical pencil, characterized in that the movable member, which is displaceable in the axial direction, is connected to a chuck or a fastener, and the moving member is connected to a chuck or a fastener by a link member located at a position such that the inclination angle can be changed. 2. The sharpener according to claim 1, wherein the moving member displacing in the radial direction and the movable member displacing in the axial direction are both constituted by rollers, and are connected to each link member by a pin. pencil. 3. The axially displaceable moving member is connected to a cylindrical member connected to a chuck, and the chuck is engaged with a fastener that is biased by a spring and attached to be able to move a certain distance. Claim 1 structured as follows:
Mechanical pencil as described in section. 4. A mechanical pencil according to claim 1, wherein a well-known slider is attached to the mouthpiece, which can move forward and backward at will and has a lead holder made of an elastic body inside.