JPS62255196A - Composite writing utensil - 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 composite writing instrument consisting of a mechanical pencil and a ballpoint pen, and more particularly to a composite writing instrument with an improved knock system of a mechanical pencil.

[Conventional technology]

Conventional composite writing instruments of this type have a rear outer cylinder rotatably connected to the rear end of the front outer cylinder, and by rotating this rear outer cylinder, a ben delivery mechanism in the rear outer cylinder is used. By alternately protruding and retracting the mechanical pencil shaft and ballpoint pen shaft inside the front external cylinder from the tip of the front external cylinder, and knocking the rear external cylinder when the mechanical pencil shaft protrudes, the lead feeding system of the mechanical pencil shaft can be adjusted. is now being carried out.

[Problem that the invention seeks to solve]

In such conventional composite writing instruments, when using a mechanical pencil, the user first rotates the rear outer barrel to project the mechanical pencil, then grasps the front outer barrel with the hand and knocks the rear outer barrel with a thumb or the like. Since the core is fed by a screw, there was a problem in that the rear outer cylinder got caught in the hand when knocking, making it difficult to knock.

This invention was made to solve the above problem, and when using a mechanical pencil, while holding the rear outer barrel, knock the knocking member extending from the rear end.
To provide a composite writing instrument in which a knocking operation for feeding a lead can be smoothly performed without the gripping hand of the outer cylinder getting in the way. Another object of the present invention is to provide a composite writing instrument with a smooth design without the knocking part extending from the rear outer cylinder when the writing instrument is not in use or when a ballpoint pen is in use.

[Means for solving problems]

The composite writing instrument according to the present invention includes a cam barrel that is slidable in the axial direction and is engaged in the axial direction υ in the rear outer barrel that is rotatably and detachably connected to the rear end of the front outer barrel. The mechanical pencil shaft and the rear end of the ballpoint pen shaft are press-fitted to the front end of the cam cylinder, and a knock member is press-fitted to the rear end of the cam cylinder, so that when the rear outer cylinder 2 rotates, the cam The mechanical pencil shaft and the knock member are moved relative to each other in the axial direction through a cylinder so that when one of them protrudes, the other one retracts.

[For production]

In the composite writing instrument of the present invention, by rotating the rear outer cylinder, the cam cylinder rotates integrally, and the mechanical pencil shaft and ballpoint pen shaft alternately protrude and retract, and the rear outer cylinder is rotated only when the mechanical pencil shaft protrudes. A knocking member simultaneously protrudes from the rear end of the outer cylinder, and core feeding is performed by knocking this knocking member.

Note that in the case of a ballpoint pen shaft, since a knock is not required, the knock member does not protrude from the rear outer cylinder.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a front outer cylinder of the composite writing instrument, and 2 is a rear outer cylinder rotatably and removably connected to the rear end of the front outer cylinder 1 via a middle cylinder 3. .

More specifically, as shown in FIGS. 2 and 3, the middle cylinder 3 has a plurality of lips 3a extending along the axial direction at regular intervals on the outer circumferential surface, and an outward annular flange 3b at the rear end. This outward annular collar portion 3b has an annular inner groove 2a on the front end side of the rear outer cylinder 2.
As a result, the middle cylinder 3 extending from the front end of the rear outer cylinder 2 connects to the front outer cylinder 1 via the lip 3a.
It is removably press-fitted into the rear inside of the. 1a is a ring.

Incidentally, the above-mentioned engagement may be any means such as pressure engagement by a concave and convex portion having elastic force of screw engagement 1.

Therefore, by extracting the middle tube 3 together with the rear outer tube 2 from the front outer tube 1, the mechanical pencil shaft 4 and the ballpoint pen shaft 5, which are detachably attached to the rear outer tube 2, are extracted, and the mechanical pencil shaft 4 is removed. The ballpoint pen barrel 5 can be replenished and the ballpoint pen barrel 5 can be replaced.

That is, since the lead guide 41 of the mechanical pencil shaft 4 is removably connected to the tip of the lead pipe 40, the lead guide 41 cannot be removed from the lead tube 40 after the rear outer cylinder 2 is removed. ), the wick can be refilled.

In this mechanical pencil shaft 4, a lead chuck, a chuck tightening ring, and a first
A core delivery mechanism 43 having an elastic body 42 and the like is disposed, and an engager 6 is connected to the rear end of the core pipe 40, and a second elastic body 44 disposed at the front of the retainer 6 The entire mechanical pencil shaft 4 is biased in the backward direction.

On the other hand, an engaging element 7 is also arranged at the rear end of the ballpoint pen shaft 5,
The ballpoint pen shaft 5 is biased in the backward direction by an elastic body 50 disposed at the front of the retainer 7.

The mechanical pencil shaft 4 and the ballpoint pen shaft 5 are connected to the pen holder 8 via their respective retainers 6.7 so as to be slidable in the axial direction. This pen holder 8 is
As shown in Figure 4, there are two sliding holes 8a and 8b for sliding the retainer 6.7, and the tip side thereof is connected to the center shaft 3 via a step 8c as shown in Figure 3. Movement is restricted. A slide guide 12, which will be described later, is fixed to the rear end shaft portion 8d of the pen holder 8, as shown in FIG. In addition, this pen holder 8 and slide guide 1
2 does not move even when knocked.

A cam cylinder 9 is arranged on the outer periphery of the pen holder 8 and is slidable with respect to the pen holder 8 and rotates together with the rear outer cylinder 2.

That is, as shown in FIG. 6, the cam cylinder 9 has an outward engaging protrusion 9a on its outer circumferential surface slidably fitted into a guide groove 2b provided in the axial direction of the inner circumferential surface of the rear outer cylinder 2. As a result, the rear outer cylinder 2 is locked to the rear outer cylinder 2 in the axial direction, and is an additional structure that is slidable in the axial direction.

Further, a stopper wall portion 9b that contacts the pen holder 8 and restricts the forward movement of the cam barrel 9 is formed inside the cam barrel 9. Further, the fitting shaft portion 8d passes through the center hole portion 9C of the cam cylinder 9.

Here, between the stopper wall portion 9b and the pen holder 8,
As shown in the first diagram, a knock A is secured so that the mechanical pencil shaft 4 can be knocked. Further, a knock A is also secured between the engaging element 6 and the stepped portion 8C of the pen holder 8. However, there is no knocking between the engagement hole 7 of the ballpoint pen shaft 5 and the stepped portion 8c since there is no need for knocking the ballpoint pen shaft 5.

The cam cylinder 9 has a front cam surface 1o and a rear cam surface 11, as shown in FIGS. 8 and 9.

The front cam surface 10 has curved inclined cam surfaces 10ae10 on both sides.
b, a flat front end locking surface 10c continuous to these front ends, and a rear end locking surface 10d continuous to the rear end of the curved inclined cam surfaces 10a, 10b.

On the other hand, the rear cam surface 11 is curved and has a front end locking portion 11a and a rear end notch locking portion 11b.

For example, when the engager 6 of the mechanical pencil shaft 4 is engaged with one curved inclined cam surface 10a of the front cam surface 10, the ballpoint pen shaft 5 is engaged with the other curved inclined cam surface 10b at a symmetrical position. The engaging elements 6 and 7 are pressed into engagement with the front cam surface 10 by the biasing force of the elastic bodies 44 and 50 so that the engaging elements 7 are engaged.

Therefore, due to the rotation of the cam cylinder 9, the p1 curved inclined cam surface 10a
, 10b, the mechanical pencil shaft 4 and ballpoint pen shaft 5 are housed and held in the front outer cylinder 1, and the mechanical pencil shaft 4 engager 6 is held in the tip locking surface. 1
0c, the mechanical pencil shaft 4 protrudes, and at the same time, the engaging element 7 of the ballpoint pen shaft 5 engages with the rear end locking surface 10d, and the ballpoint pen shaft 5 is held in the retracted storage position. Conversely, when the engager 6 engages with the rear end locking surface 10d and the engager 7 engages with the front end locking surface 10c, the mechanical pencil shaft 4 is in the retracted position and the ballpoint pen shaft 5 is in the protruding position. is maintained.

In this manner, the mechanical pencil shaft 4 and the ballpoint pen shaft 5 are alternately moved forward and backward by the rotation of the cam barrel 9, and are housed at the same time.

As shown in the first and fifth figures, the front end of a slide guide 12 is fitted inside the rear end of the cam cylinder 9 and connected to the rear shaft portion 8d of the pen holder 8.

A knock member 13 inserted into the rear end side of the rear outer cylinder 2 is slidably fitted onto the slide guide 12 .

In this embodiment, the knocking member 13 is inserted into the rear side of the rear outer cylinder 2 and is fitted into an eraser holder 13a that is slidably fitted on the slide guide 12 and covers the eraser 14. Cap 1 extending from the rear end of the
It consists of 3b.

Here, as shown in FIGS. 1, 5, and 7, the eraser holder 13a has an engaging piece 13c on its outer circumferential surface that engages with the rear cam surface 11 of the cam cylinder 9, and has an inner circumferential surface. A sliding groove 13d is provided in and is slidably fitted into and engaged with the guide protrusion 12a on the outer peripheral surface of the slide guide 12.

Due to this engagement, the engaging piece 13c of the eraser holder 13a is held on the rearward extension line of the engaging element 6 of the mechanical pencil shaft 4.

The engaging element 6 and the engaging piece portion 13 of such a mechanical pencil shaft 4
Depending on the relative position of the cam barrel 9, the mechanical pencil shaft 4 and the eraser holder 13a move in the relative direction, and when the mechanical pencil shaft 4 protrudes, the camp 13b protrudes from the rear outer cylinder 2, and the sharpening The pen shaft 4 and the ballpoint pen shaft 5 are drawn out alternately.

The eraser holder 13a has a rear elastic body 15.
The engaging piece 13c is urged in the forward direction and is pressed into engagement with the rear cam surface 11 of the cam cylinder 9.

Next, the operation of the above embodiment will be explained. When the rear outer cylinder 2 is rotated, the cam cylinder 9 is rotated together with it, and when the engager 6 of the mechanical pencil shaft 4 moves one curved inclined cam surface 10a toward the tip locking surface 10c, The engaging element 7 of the ballpoint pen shaft 5 connects the other curved inclined cam surface 10b to the rear end locking surface 10d.
By moving toward , the mechanical pencil shaft 4 moves forward and the ballpoint pen shaft 5 moves backward.

Then, simultaneously with the forward movement of the mechanical pencil shaft 4, the eraser holder 13a moves backward against the elastic body 15,
At the same time that the mechanical pencil shaft 4 protrudes from the tip of the front outer cylinder 1, the cap 13b protrudes from the rear end of the rear outer cylinder 2. In this case, the ballpoint pen shaft 5 moves backward and the front outer cylinder 1
stored inside.

In this state, when the cap 13b is knocked, the cam barrel 9 moves forward together with the knocking member 13 via the engagement piece 13c, moves the lead pipe 40 of the mechanical pencil shaft 4 forward, and the lead delivery mechanism 43 operates. Then, core feeding is performed. As the core pipe 40 moves forward, the core delivery mechanism 43
is operated to perform core feeding).

Next, when the rear outer cylinder 2 is rotated, the cam cylinder 9 rotates integrally, and the engager 6 of the mechanical pencil shaft 4 engages the front cam surface 1.
0 from the front end locking surface 10c to the rear end locking surface 10b, and the engaging element 7 of the ballpoint pen shaft 5 moves in the opposite direction, and the engaging piece 13c of the eraser holder 13a moves toward the rear cam surface 11. from the notch locking portion 11b to the front end locking portion 11
Move towards a.

As a result, the ballpoint pen shaft 5 protrudes, and at the same time, the mechanical pencil shaft 4 and the cap 13b are both retracted and stored.

Other embodiments are shown in FIGS. 10 to 12. In this embodiment, the cam rail 1 is placed along the front cam surface 10 of the cam barrel 9.
00, and fitting grooves 6a and 7a are provided in the engaging element 6 of the mechanical pencil shaft 4 and the engaging element 7 of the ballpoint pen shaft 5, respectively, and these fitting grooves 6a and 7a are slid onto the cam rail 100 at symmetrical positions. It is fitted and engaged in a movable manner.

Here, the front end 100a and the rear end 10 of the cam rail 100 are
The width H1 of the fitting groove 6a+7a is approximately equal to the groove width h1 of the fitting groove 6a+7a, and the width H1 of the cam rail 100 is
The width H2 of the fitting grooves 6a and 7a is smaller than the groove width h1 of the fitting grooves 6a and 7a.

This allows the engaging elements 6 and 7 to move on the cam rail 100 without changing their orientation.

A drive shaft 130 is also provided at the rear end of the eraser holder 13a.
This drive shaft 130 is provided with an engaging protrusion 131, and this retaining protrusion 131 is pressed into engagement with the rear cam surface 11 of the cam cylinder 9.

Therefore, when the cam cylinder 9 is rotated together with the rear outer cylinder 2, the engagers 6 and 7 move along the cam rail 100, and the same effects as in the previous embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, by rotating the rear outer cylinder, the mechanical pencil shaft and the ballpoint pen shaft can be alternately protruded and retracted by the cam cylinder that rotates together with the rear outer cylinder, and the mechanical pencil shaft At the same time as the knock member protrudes from the rear outer cylinder, by knocking this knock member,
This type of knocking operation can be performed smoothly since the core can be fed and the grip of the outer cylinder does not get in the way when knocking. Further, since the knock member does not protrude from the outer cylinder when the ballpoint pen shaft is used or carried, a composite writing instrument with an excellent design can be obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a sectional view of a composite writing instrument according to an embodiment of the present invention, FIGS. Partially enlarged sectional view showing (b), Fig. 4(a)
) is a plan view of the pen holder, and FIG. 4(b) is a plan view of the pen holder.
), FIG. 5 is an enlarged sectional view of the main part of FIG. 1, FIG. 6 is a sectional view taken along IV-mV of FIG. 5, and FIG.
8 is a plan view of the cam cylinder, FIG. 9 is a sectional view of the same, and FIG. 1O is a sectional view of another embodiment.
FIG. 1 is a partially exploded view of the cam cylinder, and FIG. 12 is a perspective view of the main part. 1... Front outer cylinder, 2... Rear outer cylinder, 4... Mechanical pencil shaft, 5... Ballpoint pen shaft, 9... Cam barrel, 1
3... Knock member.

Claims (1)

[Claims] A rear outer cylinder (2) is rotatably and removably connected to the rear end of the front outer cylinder (1), and as the rear outer cylinder (2) rotates, it is inserted into the front outer cylinder (1). In a composite writing instrument that alternately protrudes and retracts a mechanical pencil shaft (4) and a ballpoint pen shaft (5) that are slidably inserted in the axial direction, the rear outer cylinder (2
) is engaged in the axial direction and is slidably provided in the axial direction, and the front end is press-fitted and engaged with the rear ends of the mechanical pencil shaft (4) and the ballpoint pen shaft (5). (9)
and a knocking member (13) press-fitted to the rear end of the cam barrel (9), and when the rear outer barrel (2) rotates, the cam barrel (9) engages the mechanical pencil shaft (4). ) and the knock member (13) move relative to each other in the axial direction so that when one of them protrudes, the other retracts, and only when the mechanical pencil shaft protrudes, the knock member simultaneously protrudes and knocks. A composite writing instrument characterized in that lead feeding of the mechanical pencil shaft (4) is performed via the cam barrel (9).