JPH0723588U - mechanical pencil - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to provide a mechanical pencil having a dual function that can be used either in a fixed state or in a sliding state of a tip pipe at the time of use. [Structure] An outer cylinder 1 having a tip 2 at its tip, an inner cylinder 3 movably provided in the outer cylinder 1, and chuck means 4, 5 provided at the front end of the inner cylinder 3. , A chuck ring 6 loosely fitted in the chuck portion 5a of the chuck means 4, 5.
And an inner shaft 8 provided between the inner cylinder 3 and the outer cylinder 1,
Connector means 10, 11 provided at the tip of the center shaft 8
And the connector means 10, 11 and the check means 4, 5
And a second elastic body 9 provided between the tip 2 and the center shaft 8 and the front portions of the connector means 10 and 11 and The slider 12 that is slidable, the tip pipe 13 that is integrally provided with the slider, the rotation operation member 18 that is rotatably provided on the inner cylinder 3, and the rotational movement of the rotation operation member 18 are described above. Converting means 8 for converting and transmitting to the inner cylinder 3 a linear motion in the axial direction
b, 15, 18b, 17 and the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sharp pencil, and more particularly to a mechanical pencil having a combined function that allows a tip pipe to be fixed or slid as required.

[0002]

[Prior art]

 Mechanical pencils usually have a tip pipe that projects from the opening of the tip of the tip to guide and protect the lead. Conventionally, this tip pipe is roughly classified into a fixed type that projects and is fixed from the tip during use, and a slide type that gradually retracts according to wear of the core due to use (for example, Japanese Utility Model Publication No. 50-10829). No.). Even in the fixed type, in some cases, the tip pipe and the tip tool were integrated in the outer cylinder from the viewpoint of protecting the tip pipe when not in use. By the way, the former fixed tip pipe was suitable for use with a ruler such as a drawing. However, the core protruding from the tip pipe was worn by one knock, and the core had to be knocked out and sent out. On the other hand, the latter slide type front end pipe gradually recedes as the core wears out, so it is not necessary to feed the core more frequently than the fixed type. However, since the tip pipe recedes as the core is consumed, the ruler touches the tip pipe during drawing and the tip pipe is pushed up and pushed up, and the core breaks, which is not suitable for drafting.

[0003]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a mechanical pencil in which the tip pipe can be fixed or slidable as necessary by utilizing the respective advantages of the fixed type tip and the slide type tip pipe.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, an outer cylinder provided with a tip tool at a tip, an inner cylinder movably provided in the outer cylinder, and a front portion of the inner cylinder are provided. Chuck means, a chuck ring loosely fitted to the chuck part of the chuck means, a center shaft provided between the inner cylinder and the outer cylinder, and a connector means provided at the tip of the center shaft, A first elastic body provided between the connector means and the chuck means, a second elastic body provided between the tip tool and the center shaft, and abutting on the front portion of the connector means and A slider that is slidable, a tip pipe integrally provided with the slider, a rotation operation member that is rotatably provided on the inner cylinder, and a rotational movement of the rotation operation member to the inner cylinder. Sharp composed of conversion means for converting and transmitting to linear motion in the axial direction Nshiru is obtained.

[0006]

[Action]

 By rotating the rotation operation member provided at the rear end portion of the outer cylinder, the tip pipe projects and is fixed. Since the inner cylinder advances and contacts the rear end of the slider, the backward movement of the slider is prevented. On the other hand, when the inner cylinder moves backward due to the reverse rotation of the rotary operation member, the slider becomes retractable, and the tip pipe slides backward as the core wears.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of the present invention, in which a female screw portion 1a is formed on the inner peripheral portion of the tip opening of an outer cylinder 1 for holding a mechanical pencil. A tip 2 having a small hole 2a at the tip and a male screw portion 2b on the outer periphery of the rear portion is screwed to the j portion 1a. An inner cylinder 3 is inserted into the outer cylinder 1 so as to be movable in the axial direction. The inner cylinder 3 has an opening at the rear end so that the core can be filled, and the core is stored and supplied. It functions as a so-called lead tank.

A chuck support member 4 is provided at the tip of the inner cylinder 3, and a rear portion of the chuck 5 is attached to a front portion of the chuck support member 4. A chuck ring 6 is loosely fitted in the chuck portion 5a at the tip of the chuck 5. The chuck support member 5 is provided with a center shaft 8 via a return spring 7. Further, the center shaft 8 is biased rearward with respect to the outer cylinder by a spring 9 wound between the center shaft 8 and the rear end of the tip. A connector 10 is provided at the tip of the center shaft 8, and a connector ring 11 is attached to the tip of the connector 10. The connector ring 11 is provided so as to come into contact with the rear end of the slider 12.

The slider 12 includes a slider body 12a, a tip pipe 13 that penetrates and is fixed at the center of the front portion of the slider body 12a, and a rubber packing 14 that is fitted and fixed to the rear portion of the slider body 12a. The through hole is formed so that the core can be inserted through the inner center of the through hole. The main body 12a of the slider 12 is formed in a shape similar to that shown in FIG. 3 with both sides cut, that is, an elliptical shape, and the inner wall of the tip 2 into which the slider 12 is fitted is inserted. Since it is formed in a circular shape, a gap 15 is formed between the two. This gap 15 plays a role of bleeding air from the mechanical pencil.

A thick portion 8a is formed at the rear portion of the center shaft 8, and a guide groove 8b is formed in the thick portion 8a in the axial direction. In this guide groove 8b, a guide pin 16 is provided so as to penetrate through a small hole 1b formed in the outer cylinder 1, and a tip portion of the guide pin 16 is engaged with the guide groove 8b. 8 is slidable in the axial direction but locked in the rotational direction. Further, a pin hole 8c is formed behind the thick portion 8a of the center shaft 8, and a guide pin 17 is planted in the pin hole 8c to form a protrusion. A rotation operating member 18 is fitted to the rear end of the center shaft 8 via a guide pin 17.

More specifically, the rotary operation member 18 is composed of a tubular body 18a having openings at both ends, and an inclined guide hole 18b is provided in a front portion of the cylindrical rest 18a. A head of a guide pin 17 planted on the center shaft 8 is movably engaged with 18b, and the lower end portion of the inclined guide hole 18b is such that the guide pin 17 extends toward the upper end portion of the inclined guide hole 18b. It has a locking portion 18c for preventing the return. Furthermore, a receiving member 19 to which an eraser is attached is press-fitted and fixed to the rear end of the inner cylinder 3. Reference numeral 20 is an eraser cap.

The mechanical pencil having such a structure is assembled as follows. First, the inner cylinder 3 incorporating the chuck 5 and the like is inserted into the center shaft 8, and then the spring 9 is wound around the outside of the center shaft 8. Then, the rotation operating member 18 is fitted from the rear end of the center shaft 8 and the guide pin 17 is planted in the pin hole 8c of the inner cylinder 3 to assemble the center shaft 8 and the rotation operating member 18. These are inserted into the outer cylinder 1, and then the guide pin 16 is penetrated from the small hole 1b of the outer cylinder 1 so as to be projected so as to fit in the inclined guide hole 18b formed in the thick portion 8a of the center shaft 8. Next, the tip tool 2 with the slider 12 is screwed into the outer cylinder 1.

The operation of the mechanical pencil according to the above embodiment will be described below with reference to FIG. FIG. 4 is a diagram showing an operating state of the center shaft 8 and the rotation operating member 18, and particularly showing a mutual positional relationship between the inclined guide groove 18b formed in the center shaft 8 and the guide groove 8b planted in the center shaft 8. . First, in the case of ordinary writing, that is, except for using a ruler or the like as in drawing, the operation when the tip pipe 13 is slid and the tip pipe 13 is gradually retracted according to the wear of the core will be described. In this case, the relationship between the center shaft 8 and the rotary operation member 18 is in the state shown in FIG. 4 (A). In this way, when the guide pin 17 of the center shaft 8 is located at the uppermost position of the rotary operation member 18, since the center shaft 8 is located at the uppermost position, when the rear end of the mechanical pencil is knocked for writing, the chuck ring 6 becomes The chuck ring 6 abuts against the chuck ring 6 and the chuck portion 6a is released. During this time, the slider 12 having the tip pipe 13 is pushed and moved forward, and the tip pipe 13 is projected from the opening of the tip tool 2. Then, when the knock is stopped, the chuck 6 is retracted by the return spring 7 leaving the slider 12 with the core held in the state where the core is released.

By the above operation, when writing is performed with the tip pipe 13 and the core protruding from the tip of the tip 2, the slider 12 causes the tip pipe 13 to retreat as the core is consumed. With this, a considerable amount of writing is possible. The details of the operation of the slider 12 are also described in Japanese Utility Model Publication No. 50-10839.

Next, when a ruler is used for drawing, etc., unless the tip pipe 13 is projected and fixed to be used, the tip pipe 13 may be turned up to cause core breakage. Now, a case where the tip pipe 13 is fixed and used will be described with reference to FIGS. 4 (B) and 4 (C). In this case, when the rotation operation member 18 is rotated, the state shown in FIG. 4 (B) is changed to the state shown in FIG. 4 (C). That is, the guide pin 17 of the center shaft 8 is moved to the locking portion 18c located at the lowermost portion of the inclined guide hole 18b of the rotary operation member 18.

By the way, there is a guide groove 8b in the axial direction in the thick portion 8a of the center shaft 8, and the guide pin 6 is engaged with the guide groove 8b through the outer cylinder 1 and locked in the rotational direction. . Therefore, the rotation of the rotation operating member 18 is transmitted to the center shaft 8 as an axial motion only and is advanced by this mechanism. As a result, the chuck 5 and the like connected to the center shaft 8 move forward to move the slider 12 forward so that the tip pipe 13 is projected from the tip of the tip tool 2 and fixed. In this state, the lead end of the mechanical pencil can be knocked out to properly use the lead. In this case, since the guide pin 17 of the center shaft 8 is engaged with the locking portion 18c at the lock position of the tilt guide hole 18b of the rotary operation member 18, the center shaft 8 and the like can be easily handled even if excessive writing pressure is applied. Does not retreat, and the chuck 6 at the front end contacts the rear end of the slider 12, so the slider 12 remains fixed.

In order to retract the tip pipe 13 again, the rotation operation member 18 is rotated in the opposite direction to the state shown in FIG. 4 (C) through the state shown in FIG. 4 (B) and then to the state shown in FIG. 4 (A). ) It is enough to return to the state of), and for normal writing, knock the rear end of the mechanical pencil in this state.

Next, FIG. 5 is a view showing a modified example of the rotation preventing function of the outer cylinder 1 and the center shaft 8 in the above-mentioned embodiment. In this example, the guide in the thick portion 8a of the center shaft 8 is shown. If a protrusion 8c in the axial direction is formed instead of the groove 8b and is engaged with a long groove 1c formed in the inner wall of the outer cylinder 1 in the axial direction, it is slidable in the axial direction but not in the rotational direction. Locked.

Further, FIG. 6 shows another modification of the above-mentioned rotation preventing function, in which the outer circumference of the thick portion 8a of the center shaft 8 is formed into a hexagon and the inner circumference of the outer cylinder 1 is formed into a hexagon. To do. Therefore, by inserting the center shaft 8 into the outer cylinder 1 having such a configuration, it is possible to similarly achieve the function of the rotation stop.

FIG. 7 is a partial cross-sectional view showing a modified example of the center shaft 8. In FIGS. 1 and 2, the guide pin 17 planted in the center shaft 8 is provided in the inclined guide hole 18 b of the rotation operating member 18. In this example, a protrusion 8e as shown in the figure is formed integrally with the center shaft 8 so as to engage with the inclined guide hole 18b of the rotation operating member 18. That is, the protrusion 8e is provided with the inclined surface portion 8f so as to be easily press-fitted into the inclined guide hole 18b of the rotation operation member 18, and the opposite side of the inclined surface portion 8f is upright so that the engagement cannot be released after the engagement. It is formed on the surface 8g.

FIG. 8 shows another modified example of the center shaft 8. In the case of the projection 8h having such a shape without the inclined surface portion 8f as shown in FIG. 7, it is press-fitted into the inclined guide hole 18b of the rotary operation member 18. Since it is difficult to do so, it is sufficient to form a notch 18d that widens outward in the inclined guide hole 18b as shown in FIG. Further, considering the strength of the inclined guide hole 18b, the press-fitting can be facilitated by forming the split groove 18e in a portion separated from the inclined proposal inner hole 18b as shown in FIG.

FIG. 11 is a partial sectional view showing the relationship between the slider 12 and the connector ring 11 of the mechanical pencil according to another embodiment. According to this embodiment, the front end of the connector ring 11 positioned at the front end of the connector 10 extends to extend between the outer edge of the rubber packing 14 provided at the rear part of the slider 12 and the inner wall of the front tool 2. It is fitted. As a result, even when the tip pipe 13 does not hold the core, the slider 12 can be reliably retracted by the rotation of the rotation operation member 18 in the opposite direction via the connector ring 11.

[0023]

[Effect of device]

 As described above, according to the present invention, the tip core pipe projects and is fixed by rotating the operating portion provided at the rear end of the outer cylinder. Since the inner cylinder moves forward and contacts the rear end of the slider, the backward movement of the slider is prevented. On the other hand, when the inner cylinder moves backward due to the reverse rotation of the operating portion, the slider can be retracted and the tip guide pipe slides. Therefore, it becomes possible to fix the core pipe as needed and to provide a slidable mechanical pencil by making use of the respective advantages of the fixed type and the slide type core pipes.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a mechanical pencil according to an embodiment of the present invention.

FIG. 2 is a sectional view of a mechanical pencil according to an embodiment of the present invention.

FIG. 3 is a plan view showing the relationship between a mechanical pencil tip and a slider according to an embodiment of the present invention.

FIG. 4 is a view showing an operating state of a center shaft of a mechanical pencil and a rotary operation member according to an embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a modification of the rotation stopping means of the sheave pencil according to the embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a modification of the rotation stopping means of the mechanical pencil according to the embodiment of the present invention.

FIG. 7 is a partial cross-sectional view showing a modified example of the center shaft of the mechanical pencil according to the embodiment of the present invention.

FIG. 8 is a partial cross-sectional view showing another modification of the center shaft of the mechanical pencil according to the embodiment of the present invention.

FIG. 9 is a partial cross-sectional view showing another modification of the rotary operation part of the mechanical pencil according to the embodiment of the present invention.

FIG. 10 is a partial cross-sectional view showing still another modified example of the rotary operation part of the mechanical pencil according to the embodiment of the present invention.

FIG. 11 is a partial cross-sectional view showing the relationship between the slider and the slider operating member of the shear pencil according to another embodiment of the present invention.

[Explanation of symbols]

 1 Outer Cylinder 2 Tip Tool 3 Inner Cylinder 4 Chuck Support Member (Chuck Means) 5 Chuck (Chuck Means) 5a Chuck Part (Chuck Means) 6 Chuck Ring 7 Spring (First Elastic Body) 8 Middle Axis 8b Guide Groove (Conversion Means) ) 9 spring (second elastic body) 10 connector (connector means) 11 connector ring (connector means) 12 slider 13 tip pipe 16 guide pin (converting means) 17 guide pin (converting means) 18 rotation operating member 18b inclined guide hole (Conversion means)

Claims (11)

[Scope of utility model registration request] 1. An outer cylinder having a tip at its tip, an inner cylinder movably provided in the outer cylinder, a chuck means provided at the tip of the inner cylinder, and a chuck of the chuck means. A chuck ring loosely fitted to the portion, a center shaft provided between the inner cylinder and the outer cylinder, connector means provided at the tip of the center shaft, and a connector means provided between the connector means and the chuck means. A first elastic body, a second elastic body provided between the tip and the center shaft, a slider that is in contact with the front portion of the connector means and is slidable, and the slider. A tip pipe provided integrally, a rotary operation member rotatably provided on the inner cylinder, and a conversion means for converting the rotational motion of the rotary operation member into a linear motion in the axial direction and transmitting the linear motion to the inner cylinder. A mechanical pencil characterized by being composed of. 2. The mechanical pencil according to claim 1, wherein the slider is formed with an air bleeding space in the mechanical pencil between the slider and an inner wall of the tip. 3. The conversion means includes detent means for preventing rotation of the center shaft, the detent means penetrating a slide groove formed in the center shaft and an outer cylinder so as to engage with the slide groove. The mechanical pencil according to claim 1, wherein the mechanical pencil comprises a pin that is implanted. 4. The mechanical pencil according to claim 1, wherein the detent means comprises a protrusion formed on the center shaft and a slide groove formed on the inner wall of the outer cylinder. 5. The rotation preventing means according to claim 1, wherein the cross section of the center shaft is composed of a polygonal portion and a polygonal portion formed on an inner circumference of the outer cylinder. Mechanical pencil. 6. The conversion means includes tilt guide means,
The tilt guide means is composed of a tilt guide groove having a locking portion formed on the rotary operation member, and a protrusion provided on the center shaft for engaging with the tilt guide groove. The mechanical pencil according to claim 1. 7. The slider further comprises an elastic member at a rear portion thereof, and a tip of the connector extends so as to be press-contacted between an inner peripheral portion of the tip and an outer peripheral portion of the connector. The mechanical pencil according to claim 1, wherein the mechanical pencil is formed. 8. The protrusion of the center shaft is formed by a pin implanted in a hole formed in the center shaft.
Mechanical pencil described in. 9. A notch formed by integrally molding the center shaft with the center shaft and gradually widening toward the outside for inserting the protrusion into the inclined guide groove of the rotary operation member. The mechanical pencil according to claim 7, wherein the mechanical pencil is formed by forming a portion. 10. The sharpening device according to claim 7, wherein the projection of the center shaft is formed integrally with the center shaft, and a split groove is formed in the axial direction from the front end of the rotary operation member. Pencil. 11. The method according to claim 7, wherein the protrusion of the center shaft is formed integrally with the center shaft, and the protrusion has an inclined surface at the rear portion and an upright surface at the front portion. The described mechanical pencil.