JPH10287088A - Duplex writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To let out a lead without changing holding part of a barrel each time by telescopically providing a side button at one side of a front barrel in a radial inward direction of the barrel, forwarding a writing element via a cam of a sliding dwell by pushing the button so that the lead is let out. SOLUTION: When an actuator 9 is rotated at substantially 180 degrees to a rear barrel 1, protrusions 15a, 15b of sliding dwells 14a, 14b are longitudinally moved along a cam groove 6 by rotation of a cam groove 6 upon rotation of a rotary shaft 4, and one sliding dwell is advanced while the other dwell is retracted so that an end of a mechanical pencil writing element of a front side is projected from an end port of a front barrel 18. When a side button provided at one side of the barrel 18 is pushed in this state, the end is brought into contact with a cam 17a to advance the dwell 14a to forward the element 21a of the pencil, and the lead is fed. When the shaft 4 is rotated, the dwell 14a is retracted so that the end of the element 21a is retracted in the barrel 18, and the dwell 14a is advanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises two types of mechanical pencils, and allows each of the writing tips to be alternately protruded and retracted from the tip end of the barrel so that the mechanical pencil protrudes. The present invention relates to a double-type writing instrument capable of pushing out a core by pressing a side button provided on a side surface of a barrel.

[0002]

2. Description of the Related Art In general, there is known a double-type writing instrument having a plurality of writing objects such as a mechanical pencil and a ball-point pen mounted thereon so that a writing tip can be selectively protruded and retracted from an axis. In addition, as the mechanism of the writing tip of the double-type writing instrument,
Various types are known, such as a knock type, a slider type that alternately slides a slider that protrudes from the side surface of a writing barrel, and a cam type that rotates a cam cylinder having an inclined surface.

Further, a window is formed near the gripping fingertip of the barrel, a side button is pivotally supported in the window, and a slider having an inclined surface is provided behind the chuck. 2. Description of the Related Art A side-knock type mechanical pencil is known in which a leading end thereof abuts against an inclined surface of a slider to advance the slider and advance a chuck to draw out a lead.

[0004]

A double-type writing instrument having two types of mechanical pencils is convenient as a portable writing instrument. The side-knock mechanical pencil is convenient in that the core can be extended without having to change the barrel. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to provide an extremely easy-to-use dual writing instrument having both conveniences.

[0005]

The present invention has the following arrangement to achieve the above object. The dual writing implement according to the first aspect of the present invention is a dual writing implement equipped with two types of mechanical pencils, and each of which has a writing tip that can be alternately protruded and retracted from a tip end of a barrel. A pair of sliding pieces that are alternately positioned at the front and rear retreat positions in the shaft cylinder are provided, and the leading ends of the sliding pieces are provided integrally or as separate members in front of each sliding piece, and are provided there. Each of the writing bodies is connected, and a concave portion is provided on a side surface of the distal end portion on the side of the shaft axis, and a cam portion having an inclined surface on the rear side is formed on the front surface of the concave portion, and the sliding portion is formed. A window is formed in the barrel just above the same position as the concave side surface of the sliding piece at the top advance position, and a side is pivotally supported by the rear end of the window and the tip is movable toward the axis of the barrel. The button is mounted, the side button is inserted into the recess by pressing the upper surface of the side button, and the tip is Collides with the inclined surface of the cam portion of the dynamic frame, by advancing the sliding piece therewith interlocked to advance the mechanical pencil writing body to allow feeding the core by.

According to a second aspect of the present invention, there is provided the double-sided writing implement according to the first aspect, wherein the shaft cylinder includes a front shaft and a rear shaft, and a rear shaft is formed in an inner hole of the rear shaft. About 1
A rotary shaft rotatably disposed within a range of 80 degrees and having a cam groove formed on a shaft peripheral surface, an operating body fixed to a rear end of the rotary shaft protruding at a rear end of the rear shaft, The operating body and the rotating shaft are rotatable with respect to the shaft, and the shaft is held so as to be able to shift with the mechanical pencil protruding, and projections engaging with the cam grooves of the rotating shaft are formed on the inside facing each other. The pair of sliding pieces are guided by the inner hole of the rear shaft so as to be able to move only forward and backward, and each of the sliding pieces is alternately moved forward and backward by the rotation of the rotating shaft accompanying the rotation of the operating body, so that each writing body is moved. Can be protruded and retracted from the front end of the front shaft.

[0007]

1 to 3 show an embodiment of the present invention. In FIG. 1, two kinds of mechanical pencils 21a and 21b are provided. Further, in the compound writing instrument of the present invention, it is also possible to use one type as a mechanical pencil and another as a ballpoint pen.

The double-type writing instrument shown in FIG. 1 comprises a front shaft 18 and a rear shaft 1 for accommodating a portion of a writing instrument mechanism located at a front portion, and an operating body 9 disposed at a rear end of the rear shaft. A female screw 19 is formed on the inner periphery of the rear portion of the front shaft 18. A male screw 3 is formed at a front portion of the rear shaft 1 and is screwed with the female screw 19 of the front shaft 18, and is removed as necessary to replace a writing body. A rib 1a for preventing rotation is provided on the inner periphery of the rear end of the inner hole of the rear shaft 1 for restricting a rotation range of a rotating shaft 4 described later.
(See FIG. 3) and has a step 1b.
A guide rib 2 formed in an axial direction is formed at a required location on the front inner peripheral portion of the rear shaft 1.

The rotary shaft 4 has a small-diameter portion 5 in front of a large-diameter portion 7, and a spiral cam groove 6 is formed on the peripheral surface of the small-diameter portion 5. A locking portion 8 having a reduced diameter shaft portion 7b behind the large diameter portion 7 and a shaft portion 8a and a split groove 8b formed in a rear end flange portion 8c is provided behind the shaft portion 7b. Have been. A groove or rib for stopping rotation of the operating body 9 is provided on the peripheral surface of the shaft portion 8a. Further, the rib 1a of the rear shaft 1 is engaged with the peripheral surface of the large diameter portion 7, and approximately 18
A groove 7a for regulating the rotation of the rotating shaft 4 in a range of 0 degrees is provided.

The operating body 9 is formed of a tubular portion 10 provided at the rear end of the rear shaft 1 and a clip 12 extending forward from one side surface of the outer peripheral portion of the tubular portion 10. A ball portion is provided inside the clip 12 and a hole at the rear end 10a of the cylindrical portion 10 is engaged with a groove or a rib provided on the peripheral surface of the shaft portion 8a of the rotary shaft 4. Or a groove (not shown) is provided,
The flange 8c of the rotating shaft 4 projects through the rear end of the rear end 10a, and the rotating shaft 4 and the operating body 9 are fixed.

The cylindrical portion 16 in front of the sliding pieces 14a, 14b
Insertion holes are respectively provided in a and 16b, and the rear ends of the mechanical pencils 21a and 21b are detachably fastened to the respective insertion holes. Also, the sliding pieces 14a, 14
b On the rear inner surface side, projections 15a, which allow each sliding piece to move back and forth by pressing the cam groove 6 due to the rotation of the rotation shaft 4,
15b are formed. Also, sliding pieces 14a, 14b
On the outer periphery of are provided grooves 27a and 27b which are engaged with the guide ribs 2 of the rear shaft 1 in a detent manner. Therefore,
Grooves 27a, 27 provided on side surfaces of sliding pieces 14a, 14b
The sliding pieces 14a and 14b are smoothly moved back and forth by the engagement of the guide ribs 2 with the guide ribs 2, respectively. The cross-sectional shape of the sliding pieces 14a and 14b is substantially D-shaped.
Therefore, there is an advantage that a complicated structure for mounting a guide cylinder having two opposing guide grooves, which is often shown in the conventional example, is not required. The sliding pieces 14a and 14b are in contact with each other on their flat sides.
b is provided with a guide groove (not shown) into which the guide protrusion is inserted.

The rotary shaft 4 is inserted into the inner hole of the rear shaft 1 with the projections 15a, 15b provided on the sliding pieces 14a, 14b engaged with the cam groove 6, and The rear end is in contact with the step 1b of the rear shaft, and a spring 13 is provided between the rear end of the rear shaft 1 and the front end of the rear end 10a of the operating body 9.
The operating body 9 is fixed to the rear end shaft portion 8a of the rotating shaft 4 in a state in which is biased. At this time, the locking portion 8 of the rotating shaft engages with the hole of the rear end portion 10a of the operating body, and the rotating shaft 4 and the operating body 9 are integrally fixed, and the operating body 9 rotates with respect to the rear shaft 1. As a result, the rotating shaft 4 rotates, with which one sliding piece moves forward and the other sliding piece moves backward. A crown 11 is fixed to the rear end of the operation body 9. With the above, crown 1
By knocking 1, the rotating shaft 4 changes its axis, and the sliding pieces 14a, 14b change its axis in conjunction with it.

By the way, a recess 25 is formed in the side surface on the axial center side of the rear shaft 1, which is opposed to the front of the sliding pieces 14a, 14b.
a and 25b are provided, and cam portions 17a and 17b having inclined surfaces on the rear side are formed on the front surfaces of the concave portions, respectively. A window 24 is formed in the rear shaft 1 and the window 2
4 is mounted on a side button 26 which is pivotally supported at the rear end (shaft support 24a) and whose tip 26b is movable toward the axis of the rear shaft. or,
Protruding locking portions 26a are appropriately formed on both side surfaces of the side button 26 on the rear shaft insertion side, and the locking portions 26a are attached to the rear shaft 1 of the window portion 24.
The side button 26 is prevented from coming out of the window 24 by engaging with the inner hole wall.

Rear ends (via core pipes 23a, 23b) of mechanical pencils 21a, 21b are fixed to insertion holes of the sliding pieces 14a, 14b, respectively. 18 is fixed. As described above, by pressing the upper surface of the side button 26, the side button 26 is inserted into the recess 25a and
b abuts against the inclined surface of the cam portion 17a of the sliding piece 14a,
The sliding piece 14a is advanced, and the mechanical pencil 21a is advanced in conjunction with the sliding piece 14a so that the lead can be extended. Further, the mechanical pencils 21a and 21b are used for ordinary double-type writing implements, and are capable of feeding out sharp cores of different colors or core diameters. Further, according to the embodiment, when the rear end of the crown 11 is knocked, the sliding piece 14a is knocked.
It is also possible for the core pipe 23a to shift the axis and to draw out the core in conjunction with the above.

[0015]

When the operating body 9 is rotated approximately 180 degrees with respect to the rear shaft 1, the projections 15a, 15b of the sliding pieces 14a, 14b are brought into the cam groove 6 by the rotation of the cam groove 6 accompanying the rotation of the rotary shaft 4. By moving back and forth along one of the sliding pieces, one of the sliding pieces moves forward and the other retreats, so that the leading end of the mechanical pencil on the forward side can be projected from the leading end of the front shaft 18.

FIG. 1 shows a state in which the mechanical pencil 21a is protruded. At this time, the rib 1a of the rear shaft 1 comes into contact with the contact portion 7c of the groove 7a of the large-diameter portion 7 of the rotary shaft. The rotation is regulated. In this state, when the side button 26 is pressed and pushed into the rear shaft, the tip 26a comes into contact with the cam 17a, and the sliding piece 1 is pressed.
4a is advanced, and the mechanical pencil 21a is advanced. When the pressure is released, it returns to the original state. Therefore, when the side button 26 is pressed. The core is paid out by repeating the release.

Next, when the rotating shaft 4 is rotated, the sliding piece 14 is rotated.
As a retreats, the tip of the mechanical pencil 21a penetrates into the front shaft 18, and the sliding piece 14b moves forward. At this time, the writing tip is in a portable state accommodated in the front shaft 18. When the rotating shaft 4 is further rotated, the sliding piece 14a
Is further retracted, the sliding piece 14b further advances, and the tip of the mechanical pencil 21b projects from the tip end of the front shaft 18. At this time, the contact portion 7d of the groove 7a of the large-diameter portion 7 of the rotary shaft shown in FIG. 3 abuts on the rib 1a of the rear shaft to regulate the other rotation. In this state, the side button 26 is pressed.
By repeating the release, the core is extended in the same manner as described above.

In the case where one of them is a writing body such as a ball-point pen, a rib or the like is provided on the peripheral surface of the shaft portion 7b behind the large-diameter portion 7 of the rotary shaft so as to substantially contact the rear end of the rear shaft 1. It is also possible to prevent knocking when the ballpoint pen cursive is protruded or when the cursive is stored. However, when the mechanical pencil is protruding, the rib must be fitted from the rear end of the rear shaft to prevent knocking.

[0019]

The construction and operation of the double-type writing instrument of the present invention are as described above. A simple structure that does not require a return spring for urging the writing element backward is used to provide two types of mechanical pencil writing elements. Since the core can be pulled out without having to change the barrel each time, a convenient and convenient portable writing instrument can be provided.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing the entirety of a double-type writing instrument according to an embodiment of the present invention, which is partially shown in a non-cross-sectional view.

FIG. 2 is a perspective view of the mechanical pencil viewed from the side of BB in FIG. 1;

FIG. 3 is a sectional view taken along the line AA in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 rear shaft 1a rib 1b stepped portion 2 guide rib 3 male screw 4 rotating shaft 5 small diameter portion 6 cam groove 7 large diameter portion 7a groove 7b shaft portion 7c contact portion 7d contact portion 8 locking portion 8a shaft portion 8b Split groove 8c Flange 9 Operating body 10 Cylindrical part 10a Rear end part 11 Crown 12 Clip 13 Spring 14a Sliding piece 14b Sliding piece 15a Projecting part 15b Projecting part 16a Cylindrical part 16b Cylindrical part 17a Cam part 17b Cam part 18 Point Shaft 19 Female screw 20 Inner step 21a Mechanical pencil writing body 21b Mechanical pencil writing body 22a Step 22b Step 23a Core pipe 23b Core pipe 24 Window 24a Shaft support 25a Recess 25b Recess 26 Side button 26a Lock tip 26b 27a groove 27b groove

Claims (2)

[Claims] 1. A dual-purpose writing instrument equipped with two types of mechanical pencils, and each of which has a writing tip which can be selectively turned up and down alternately from a tip end of a barrel. A pair of sliding pieces positioned at the front and rear retreat positions are provided, and a tip portion is provided integrally or separately at the tip of each sliding piece, and each writing body is connected thereto,
A concave portion is provided on the side surface of the distal end portion on the side of the shaft cylinder axis, and a cam portion having an inclined surface on the rear side is formed on the front surface of the concave portion. A window portion is formed in the barrel directly above the same position as the side surface of the concave portion, and a side button that is supported by the rear end of the window portion and has a tip end movable toward the axis of the barrel is mounted. By pressing the upper surface of the slide button, the side button is inserted into the concave portion, and the tip end abuts against the inclined surface of the cam portion of the sliding piece, and the sliding piece is advanced, and the mechanical pencil is advanced in conjunction with the sliding piece. A double-type writing instrument that allows the core to be extended. 2. A shaft cylinder comprising a front shaft and a rear shaft, which is disposed in an inner hole of the rear shaft so as to be rotatable within a range of approximately 180 degrees with respect to the rear shaft, and a cam groove is formed on a shaft peripheral surface. A formed rotation axis,
An operating body fixed to the rear end of the rotating shaft protruding from the rear end of the rear shaft, the operating body and the rotating shaft being rotatable with respect to the rear shaft, and
A pair of sliding pieces formed on the inner side of the rotating shaft, which are held in a protruding state with the mechanical pencil protruding, and which engage with the cam grooves of the rotary shaft, respectively, are opposed to the inner hole of the rear shaft. Only the movement is guided, and each sliding piece moves back and forth alternately by the rotation of the rotating shaft accompanying the rotation of the operating body, so that the writing tip of each writing body can be protruded and retracted from the front shaft tip opening. The dual writing implement according to claim 1, wherein the writing implement is configured as follows.