JP2575776Y2 - Double writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-type writing instrument in which writing portions of two writing bodies, a mechanical pencil and a ball-point pen, can be selectively protruded and retracted at a shaft tip opening.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of a double writing instrument, as shown in Japanese Utility Model Laid-Open Publication No. 57-39787, a sliding groove for guiding two writing bodies is provided, and The front end has a cam slope which is in contact with a sliding piece attached to a guide cylinder to be fixed and two writing bodies fitted to the guide cylinder, and the rear end forms a knocking part and is axially oriented with respect to the cap. A cylindrical cam mounted so as to be freely movable and circumferentially integral with each other is provided, and two writing bodies can be selectively protruded and retracted at the shaft tip opening by rotating the cap with respect to the front shaft. There are multiple writing instruments.

[0003]

In the above conventional example, a knocking portion for leading out a mechanical pencil is projected from the rear end of the shaft, and the knocking portion is rotated when an impact pressure due to a drop or the like is applied to the knocking portion. First mechanism where internal mechanisms such as mechanisms are easily damaged
The problem exists. Further, there is a second problem that the appearance is deteriorated due to the presence of the knock portion. In addition, this kind of writing instrument tends to have a large shaft diameter, but there is a demand for making it as thin as possible in a high-end appearance.

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, the dual writing instrument of the present invention has the following configuration. First, with respect to the rear wall of the circumferential groove where the writing portion of the mechanical pencil protrudes from the shaft tip opening, the circumferential groove where the brim where the writing portion of the ballpoint pen projects from the shaft tip opening is located. Set the position of the rear wall of the other end ahead of the required distance, and set the stopper
And attach the front edge of this stopper ring to the
Fix the joining cylinder to the front shaft while abutting the rear edge of
Set the gap between the front edge of the cap and the rear edge of the stopper ring when the writing part of the mechanical pencil protrudes from the front end of the shaft approximately equal to the axial displacement of the rear wall at both ends of the circumferential groove. Writing part of mechanical pencil
When protruding, the front edge of the cap is behind the stopper ring
Knocking operation between gaps abutting the edge allows the core to be extended
The front edge of the cap abuts the rear edge of the stopper ring when the cursive writing is stored and when the ballpoint pen projects.
Therefore, the gap becomes substantially zero. Therefore, there is no need for a protruding knock portion, and there is no need for a structure for shifting the shaft while the cap is fitted to the front shaft. In addition, each of the mechanical parts can be designed to be thin by making the rotating mechanism part a die-cast molded product, and the stroke for writing and retracting the writing body is set large by making the cam slope of the cylindrical cam appropriately steep. In addition, by sliding the tip of the sliding piece to the rear end of the holding pipe that joins the writing body such as a ballpoint pen to the rear end of the core pipe that joins the pencil pencil writing body, the sliding of the writing body becomes smooth. also it is possible to improve the appearance and thin shaft destination and shaft diameter as much as possible, the interior of such rotating mechanism
There is no damage to the mechanism, and the body can be improved.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First, as shown in FIG.
The main components are a tip shaft 40, a cylindrical cam 17, a cap 33, a pair of sliding pieces 8, 8 #, a pencil pencil writing body 27, and a writing body 29 such as a ballpoint pen. As shown in FIG. 2, the guide cylinder 1 is a die-cast molded product, and has a pair of axially long guide grooves 2a and 2b which are respectively opened on both side surfaces substantially opposite from a front end to a rear end position. The guide groove 2 is formed so as to be elastically displaceable in a direction substantially perpendicular to the groove, and has a rear end in front of each guide groove 2.
a, 2b, a front end having an open shaft portion 2, a rear end side surface portion having a circumferential circumferential groove 4, the circumferential groove 4 having a wide groove 5 and a narrow groove 6; Are connected by a slope 7.

[0006] Next, as shown in Fig. 1, the front shaft 40 is a cylindrical metal body integrally or integrally connected to a base or the like, with a tapered front end and opened front and rear ends. A joining cylinder 21 having a rib-shaped bulging engagement portion 22 on the front outer periphery is fixed to the shaft portion 2 of the above-described guide cylinder 1, and further attached to the outer periphery of the joining cylinder 21 behind the engagement portion 22. The stopper ring 23 is fixed. The guide tube 1 is inserted into the joint tube 21 through the rear end opening of the front shaft 40 and the engagement portion 22 is moved forward with the front edge of the stopper ring 23 in contact with the rear end of the front shaft 40. It is detachably fixed to the inner surface of the shaft 40.

As shown in FIG. 3, the cylindrical cam 17 has a cam slope 18 which is circumferentially displaced back and forth at the front end edge of the inner hole, and has a notch 19a at the foremost end of the cam slope 18. ,
At the rear, there is a quarter-circumferential brim 19. A shaft portion 20a having a hole 20 is provided at the rear end. or,
The flange 19 of the cylindrical cam 17 is formed in the circumferential groove 4 at the rear end of the guide cylinder 1.
The guide cylinder 1 is fitted to the guide cylinder 1 by elastic displacement, and is fitted to the guide cylinder 1 so as to be freely rotatable and axially movable, and is prevented from falling off.

The cap 33 is a cylindrical metal body, a clip is fixed to one side of the outer periphery, an eraser holder 34 is fixed to the rear end hole, and an eraser is fixed to the rear end hole of the eraser holder 34. Eraser 3 held by stopper 36
The cover 35 is detachably attached to the outer periphery of the eraser holder 34 with the cover 7 fitted. The cylindrical cam 17
Are positioned in the inner hole of the cap 33 and are integrally fixed.

As shown in FIGS. 4 and 7, the sliding pieces 8 and 8 # have projections on the outer surface, and the rear end faces of the projections have projections 12 and 12 # at the center and project on both sides. Cam slopes 11, 11 having substantially the same slope as the cam slope 18 of the cylindrical cam 17 described above.
突起 is provided, and screw portions 10, 10 に は are provided behind the protrusions.
Are provided. The mechanical pencil 27 is a general chuck mechanism (not shown).
The core pipe 24 is joined to the rear end of the core pipe 24 via a shaft joint 32 connected to a chuck mechanism. Part 1
6 is a round hole-shaped groove 13 formed in the side surface of the sliding piece 8
, The sliding piece 8 and the joint 14 are flexibly joined. Also, the writing body 29 such as a ballpoint pen
A holding tube 25 is joined to a rear end of the holding tube 25, and a shaft portion 15a of a joint 14 # having a round hole-shaped groove 13 # is fixed to a rear end of the holding tube 25. It comes into contact with the end. At this time, a round shaft-shaped support portion 16 # projecting in front of the sliding piece 8 # is fitted in the groove 13 #, and the sliding piece 8 # and the joint 14 # are flexibly joined.

[0010] In addition, in the writing body 27 such as a mechanical pencil 27 and a writing pen 29 such as a ball-point pen, respective sliding pieces 8, 8 # are movably fitted in the respective guide grooves 2a, 2b of the guide cylinder 1 described above. Tension springs 38, 38 # are laid between the shafts 9, 9 # of the moving pieces 8, 8 # and the end 3 at the rear end of the guide cylinder 1 and are constantly urged rearward. In addition, the tension spring 38,
The tip of 38 ° is fastened with a coil wound around grooves or screw portions 10, 10 ｀ appropriately formed in the shafts 9, 9 ｀ of the sliding pieces 8, 8 ｀. , 38 ° are formed on the end portion 3 of the guide tube 1 and fixed to the end portion 3 of the guide cylinder 1 to form slightly larger diameter end winding portions 39, 39 °.

The front half of the cylindrical cam 17 is arranged so as to cover the outer periphery of the rear end of the guide cylinder 1, and the sliding pieces 8, 8 # of each writing body are urged rearward by tension springs 38, 38 #. The cam slopes 11 and 11 of the projections
｀ is kept in contact with the cam slope 18 of the cylindrical cam 17. In addition, the flange 19 of the cylindrical cam 17 is connected to the circumferential groove 4 of the guide cylinder 1.
Is inserted into. The circumferential groove 4 is provided over a range of about 180 ° in the circumferential direction. As shown in FIG. 2, the rear wall 5 ｀ at one end is located a required distance behind the rear wall 6 ｀ at the other end and The walls 5 # and 6 # are connected by a slope 7, and the distance between the rear wall 5 # and the front wall 7 # is set to be slightly longer than the knock stroke for extending the lead of the mechanical pencil 27. The axial distance between the rear walls 5 ° and 6 ° of both ends is the joint cylinder 21 fixed to the front end of the cap 33 and the front shaft 40.
Of the stopper ring 23 and the knock stroke.

When the notch 19a at the foremost end of the cam slope 18 engages with the rear end projection 12 of the slide piece 8 of the mechanical pencil writing body 27, the flange 19 of the cylindrical cam 17 is rotated.
And the cam slope 18
8a of the writing body 29 such as a notch 19a and a ballpoint pen
Is adjusted so as to correspond to the rear wall 6 # of the other end of the circumferential groove 4 when the rear end projection 12 # is engaged. or,
Mechanical pencil 27 such as mechanical pencil and pencil 29 such as ballpoint pen
The length of each of the sliding pieces 8, 8 ｀ is appropriately adjusted such that the front end writing portions 28, 30 protrude from the front shaft tip opening 41 in a state where the sliding pieces 8, 8 ｀ are engaged with the notch 19 a at the foremost end of the cam slope 18. Is set.

[0013]

FIG. 1 shows that the front notch 19a of the cam slope 18 of the cylindrical cam 17 engages with the sliding piece 8 of one mechanical pencil writing body 27 to protrude the writing portion 28 from the front end 41 of the front shaft. At this time, the flange 19 of the inner hole of the cylindrical cam 17 is located at the position of the wide groove 5 of the circumferential groove 4 of the guide cylinder 1 shown in FIG. When the cover 35 fixed to the rear end of the cap 33 is knocked in this state, the knocking force is transmitted to the core pipe 24 through the notch 19a of the cam slope 18 and the sliding piece 8, and the axial transition of the core pipe 24 is performed. With this, the core is extended and can be written. When the writing implement is dropped in this state and an impact is applied to the rear end thereof, the impact is absorbed by the cap 33 to prevent the internal rotation mechanism and the like from being damaged.

Next, the cap 33 is rotated with respect to the front shaft 40 to release the engagement between the notch 19a at the foremost end of the cam slope 18 and the sliding piece 8 of the mechanical pencil 27. The sliding piece 8 of the mechanical pencil 27 is retracted by the slope 18, and the sliding piece 8 の of the writing body 29 such as a ball-point pen is moved forward, and the flange 19 passes through the slope 7 of the circumferential groove 4. 6, when the writing portion 28 of the mechanical pencil 27 is immersed in the front shaft 40, and further rotated, the mechanical pencil 27 is rotated.
The notch 19a of the cam slope 18 and the sliding piece 8 # of the writing body 29 such as a ball-point pen engage with each other in a state where the writing body 29 such as a ball-point pen is rotated by approximately 180 degrees.
0 is projected, and the flange 19 is fitted into the narrow groove 6 of the circumferential groove 4 deeply. At this time, the collar 19 advances by a distance in the axial direction of the slope 7 of the circumferential groove 4, so that the front edge of the cap 33 is substantially in contact with the rear edge of the stopper ring 23.
(Not shown) When the writing body is in the immersed state, the brim 19 is suspended in the narrow groove 6 and thus is in a substantially contact state.

[0015]

[Effect of the Invention] As described above, the present invention displaces the rear walls of both ends of the circumferential groove of the guide cylinder in the axial direction, and can also displace the gap corresponding to the knock stroke between the front edge of the cap and the stopper ring. The cap shifts only when the mechanical pencil is used, so it is not knocked when carrying it, and if a shock is applied to the rear end due to dropping etc., the shock pressure is absorbed by the cap This has the effect of preventing damage to the internal rotation mechanism and the like. In addition, since there is no knocking part that changes the axis at the rear end of the shaft, it is possible to make appearance suitable for high-grade products, make the rotating mechanism part a thin die-cast molded product, and make the core pipe and holding pipe and sliding piece By flexibly joining, the writing body slides smoothly when the writing section comes out of the front end of the front shaft, and the appearance of the shaft, such as the shaft diameter and the front end of the front shaft, can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view showing an embodiment of the present invention, showing a use state of a mechanical pencil.

FIG. 2 is a half sectional view of a guide cylinder used in the present invention.

FIG. 3 is a sectional view of the cylindrical cam used in the present invention.

FIG. 4 is a front view, partially in section, showing the state of the joint between the sliding piece on the mechanical pencil side and the core pipe used in the present invention.

FIG. 5 is a front view of the joint in FIG. 4;

FIG. 6 is a front view of the sliding piece in FIG. 4;

FIG. 7 is a front view, partially in section, showing the state of the joint between the sliding piece on the ballpoint pen side and the holding tube used in the present invention.

FIG. 8 is a front view of the joint in FIG. 7;

FIG. 9 is a top view of the sliding piece in FIG. 7;

FIG. 10 is a front view of the sliding piece in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide cylinder 2 Shaft part 2a Guide groove 2b Guide groove 3 End part 4 Peripheral groove 5 Wide groove 5 ｀ Rear wall 6 Narrow groove 6 ｀ Rear wall 7 Slope 7 ｀ Front wall 8 Sliding piece 8 ｀ Sliding piece 9 Shaft 9 ｀ Shaft 10 Screw 10 部 Screw 11 Cam slope 11 ｀ Cam slope 12 Projection 12 ｀ Projection 13 Groove 13 ｀ Groove 14 Joint 14 ｀ Joint 15 Shaft 15a Shaft 15b Flange 16 Support 16支持 Supporting part 17 Cylindrical cam 18 Cam slope 19 Flange 19a Notch 20 hole 20a Shaft part 20b Rear end part 21 Joining cylinder 22 Engaging part 23 Stopper ring 24 Core pipe 25 Holding pipe 26 Stopper 27 Sharp pencil writing body 28 Writing part 29 Ball pen Cursive body etc. 30 Writing section 31 Knock spring 32 Shaft coupling 33 Cap 34 Eraser holder 35 Cover 36 Eraser stopper 37 Eraser Rubber 38 Tension spring 38 ° Tension spring 39 End turn 39 ° End turn 40 Front shaft 41 Front shaft front end

Claims (1)

(57) [Scope of request for utility model registration] 1. A guide cylinder having a pair of guide grooves is disposed in a cap, and sliding pieces are attached to rear ends of a core pipe and a holding pipe for joining two writing bodies of a mechanical pencil and a ballpoint pen, respectively. These writing bodies are fitted in the guide grooves of the guide cylinder so as to be freely movable in the axial direction, and a cylindrical cam having a cam slope that is displaced in the axial direction is fixed to the cap, and can be rotated and shifted with respect to the guide cylinder. And the cam slope is brought into contact with the sliding piece of each writing body, and the flange provided on the cylindrical cam is fitted into the circumferential groove provided on the rear end of the guide cylinder, and the front shaft fixed to the front of the guide cylinder is In a double-type writing instrument in which the writing body can be selectively moved in and out from the tip of the shaft by rotating the cap, the guide cylinder, cylindrical cam, and sliding piece are formed by die-casting, and the sliding piece and A tension spring between the ends Along with energizing, the front end of the sliding piece is jointed to the rear end of the core pipe and the holding pipe in a flexible state ,
Fix the stopper ring and fix the stopper ring
With the front edge in contact with the rear edge of the front shaft,
When the writing portion of the ballpoint pen projects from the shaft tip opening against the rear wall of the circumferential groove where the collar is located when the writing portion of the mechanical pencil projects from the shaft tip opening, Set the position of the rear wall of the peripheral groove located forward of the required distance, and in the state where the writing part of the mechanical pencil protrudes from the front end of the shaft, remove the gap between the front edge of the cap and the rear edge of the stopper ring. A double writing implement characterized in that the axial displacement of the rear wall at both ends of the circumferential groove is set to be substantially the same.