JP3221845B2 - Composite 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 composite writing instrument for selectively projecting a ballpoint pen core and a mechanical pencil core.

[0002]

2. Description of the Related Art A composite writing instrument in which a ballpoint pen and a mechanical pencil are stored in a body is not always a core, and a number of these cores are stored and a selected one is pointed. It is designed to be pushed out from the tip of the shape and written.

[0003]

However, when these cores are slightly inserted from the tip, that is, at a position where the core can be pulled out with a small pushing amount by knocking operation, the core to be pushed out can be obtained. There is a risk that the stored core may interfere with the core, and a sufficient distance is provided between the tip and the stored position of the core. As a result, the push-in distance for leading the lead becomes long, and the knock slider protrudes greatly rearward and becomes long as a whole.

An object of the present invention is to provide a composite writing instrument having a short outer length by shortening the pushing distance of the knock slider without changing the pushing distance of the core.

[0005]

Means for Solving the Problems In order to achieve this object, according to claim 1 invention, the desired the core of the ball-point pen core normally in built into the fuselage and pencil core
In a composite writing instrument that is selected at the position of the rod pendulum to swing and protrudes from the tip by a knocking motion, the composite writing instrument moves forward and backward along the central axis of the body, and the rear end is normally urged out of the body in a normal state. A knocking slider formed with a slider cam surface inclined with respect to the center axis at a front end cylindrical portion, and a first guide projection provided outside the cylindrical portion; and Make the cylindrical part slidable,
A guide cylinder fixed to the body, wherein a straight first cam groove along the center axis and a straight second cam groove inclined with respect to the center axis to guide and slide the first guide projection are formed; Is housed inside the cylindrical portion of the knock slider, moves forward and backward along the central axis, abuts and slides on the slider cam surface, and projects and slides into the first cam groove. A second guide projection is provided, and
A composite writing instrument comprising a slider provided with a pendulum .

According to a second aspect of the present invention, in the first aspect, a centering knock engaging portion for a mechanical pencil is formed on the cam surface for the slider, and the centering for the mechanical pencil is formed in the second cam groove. A composite writing implement is characterized in that a knock groove portion is formed along the center axis corresponding to the knock engagement portion.

[0007]

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing embodiments.

FIGS. 1 to 11 show an embodiment of the present invention.

In FIG. 2, reference numeral 1 denotes a composite writing instrument, and a ball-point pen core which moves forward and backward so as to protrude and retract from a front end opening 3 in a cylindrical body 2 (2a, 2b) divided into front and rear parts with a pointed tip. A plurality of bodies 4 and mechanical pencil cores 5 are stored around the central axis CL of the body 2 with the rear end positions thereof being regulated in a predetermined arrangement relationship. Behind these cores 4 and 5,
The knock slider 20, the guide cylinder 30, the slider 40, and the rod pendulum 6 are incorporated. The rod-shaped pendulum 6 is attached to the slider 40 so as to freely swing in a pendulum shape. The slider 40 is provided in the knock slider 20, and the knock slider 20 is provided in the guide cylinder 30 so as to make a predetermined movement. And a spring 7 wound in a conical shape
The spring 7 is urged so that the spring 7 is pressed smoothly against the knock slider 20 without buckling, and the knock slider 20 also becomes a normal state when not in use with the rear end protruding to the maximum.

When the knock slider 20 is knocked, a pin 25 described later protrudes and engages to maintain a use state, and an opening 8 having a size capable of centering and knocking the mechanical pencil core 5 is provided. , Is provided on the body 2b.

The knock slider 20 is shown in FIGS.
(C), which is shown in FIGS. 5 to 7, wherein the knockout portion 21 of a solid round bar in this example projects substantially entirely from the body 2 ,
It is constituted by a cylindrical portion 22 which is slightly larger than this diameter and is opened rearward where a step can be formed at a boundary. A slider cam surface 23 is formed on the cylindrical portion 22. The slider cam surface 23 has a cam surface portion 23a inclined with respect to the center axis CL and a mechanical pencil as shown in a developed view in FIG. And a centering knock locking portion 23b for the vehicle. That is, the cam surface 23 for the slider enters parallel to the central axis line CL from the cylindrical end surface, and a cam surface portion 23a inclined from that position is formed.
3b is formed, and the central axis CL
And are formed in parallel.

Although the cylindrical portion 22 is used, the knock portion 2
1 perpendicular to the center axis CL is the solid portion of the boundary between this central axis hole 24 that passes through the CL is formed, the pin 25 is mounted to be protruded biased by a spring (not shown) in the hole 24 . Further, a through hole 26 is formed in the cylindrical portion 22 at a position on the same circumference as a position deepest from the end face of the cam surface portion 23a. A first guide projection 27 into which a metal pin or the like is press-fitted and protrudes only outward is formed in the through hole 26 (see FIGS. 1 to 3).

The guide cylinder 30 is shown in FIGS. 8 to 11 and is inclined with respect to the central axis CL and a linear first cam groove 31 parallel to (along) the central axis CL on the cylindrical wall surface.
Linear second cam groove 3 for guiding and sliding first guide projection 27
Two. The second cam groove 32 has a knock groove 33 formed at the front end thereof along the center axis CL corresponding to the centering knock locking portion 23b for the mechanical pencil. On the other hand, the first cam groove 31 is formed so as to include a groove having a length corresponding to the knock groove 33 on the front side.

As shown in FIG. 3, the slider 40 has a partition wall 41 formed at an intermediate portion of a cylindrical shape, is housed inside the cylindrical portion 22 of the knock slider 20, and moves forward and backward along the center axis CL. Has become. In addition, the slider 40 is provided with a second guide projection 42 that slides in contact with the slider cam surface 23 and protrudes into the first cam groove 31 to be slid and guided. One end of the bar-shaped pendulum 6 is constrained in the recess on the front side of the slider 40, and has a degree of freedom such that the other end swings around.

Next, a method of using the composite writing instrument 1 will be described.

As shown in FIG. 2, when the composite writing instrument 1 is in a normal state, the bar-shaped pendulum 6 is shown in a posture along the central axis CL in the figure, but is actually a free end according to the action of gravity. The tip side faces downward in the direction of gravity, that is, the inner wall surface of the body 2.

Either the ball-point pen core 4 or the mechanical pencil core 5 is gripped so that the core to be used comes to the lower side when the composite writing instrument 1 is inclined or horizontal, and the rod pendulum 6
Is located just behind the desired core.

From the normal state before knocking as shown in FIG.
When a knocking operation (operating distance P) of pushing the knock slider 20 against the force of the spring 7 is performed, FIG.
As shown in (c), while the first guide projection 27 of the knock slider 20 moves in the second cam groove 32 of the guide cylinder 30 fixed to the body 2, the knock slider 20 moves forward while rotating clockwise (operation). Distance S). Knock slider 2
The rotation of 0 causes the inclined cam surface portion 23a to also rotate clockwise, so that the second guide protrusion 42 of the slider 40, which is in contact with the cam surface portion 23a, also receives a diagonally forward right force.

However, the second guide protrusion 42 is regulated by the first cam groove 31 of the fixed guide cylinder 30 and is advanced (movement distance t) along the center axis, and the slider 40 is knocked. The vehicle moves forward by a distance q larger than the knock operation distance P of 20. That is, the pushing distance of the knock slider is smaller than the required center pushing distance, and the knock slider 2 from the rear end is required.
The protrusion length of 0 also becomes shorter.

When the first guide projection 27 enters the knock groove 33 of the second guide groove 32, the second guide projection 42 is locked by the centering knock locking portion 23b.
Of the rod pendulum 6 attached to the slider 40 and pushes a desired core body into a use state.

At the end of use, or when it is desired to use another core, the pin 25 is pushed in by means (not shown) to open the opening 8.
Is disengaged from the body 2, the knock slider 20 becomes the normal state before knocking, in which the knock slider 20 protrudes to the maximum from the body 2 by the force of the spring 7.

In particular, when the mechanical pencil core 5 is used, not only the mechanical pencil core 5 must be protruded from the front end opening 3 of the body 2 but also the core itself must be extended by a centering knocking operation. Accordingly, in the state of FIG. 1 (c) Move by operating distance r in centering knocking operation 1
As shown in FIG. 1D, when the hand is released, it returns to the position shown in FIG. By repeating this knock, it is possible to adjust the wear of the lead and the appearance of the lead.

[0024]

As described above, according to the first aspect of the present invention, the projecting distance of the knock slider from the body can be shortened, and the length of the writing instrument can be shortened.

According to the invention of claim 2, in addition to the effect of claim 1, a mechanical pencil core can be used.

[0026]

[Brief description of the drawings]

1A and 1B are views showing a main part assembly including a knock slider of a composite writing instrument according to the present invention, wherein FIG. 1A is a normal state before a core is pushed out, FIG. (C) shows a state where the centering knock is locked, and (d) shows a state where the centering knock is knocked.

FIG. 2 is a vertical center sectional view of the composite writing instrument according to the present invention.

FIG. 3 is a sectional view of an essential part of the composite writing instrument shown in FIG. 2;
(A) in FIG. 1 (a), (b) in FIG. 1 (c),
(C) corresponds to (d) in FIG.

4 (a) is a plan view, FIG. 4 (b) is a front sectional view, and FIG. 4 (c) is a front view.

FIG. 5 is a sectional view taken along line AA of FIG. 4 (b).

FIG. 6 is a sectional view taken along line BB of FIG. 4 (b).

FIG. 7 is a development view of a tubular portion of the knock slider.

FIG. 8 shows a guide cylinder, (a) is a plan view,
(B) is a front view, and (C) is a bottom view.

FIG. 9 is a sectional view taken along the line CC of FIG. 8 (b).

FIG. 10 is a sectional view taken along line DD of FIG. 8 (b).

FIG. 11 is a development view of a cam cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Composite writing instrument 2 ... Body 3 ... Tip opening 4 ... Ball-point pen core 5 ... Mechanical pencil core 6 ... Rod pendulum 7 ... Spring 8 ... Opening 20 ... Knock slider 21 ... Knock part 22 ... Cylindrical part 23a ... Cam surface part 23b ... Centering knock locking part 27 ... First guide projection 30 ... Guide cylinder 31 ... First cam groove 32 ... Second cam groove 33 ... Knock groove part 40 ... Slider 42 ... Second guide projection

Claims (2)

(57) [Claims] 1. A ball-point pen core body and a desired mechanical body of a mechanical pencil body which are normally incorporated in a body are rod-shaped.
In the composite writing instrument, which is selected at the position where the child touches and protrudes from the front end by the knocking operation to be used, the rear end moves forward and backward along the center axis of the body, and the rear end is normally urged to protrude out of the body. A cam surface for a slider that is inclined with respect to the central axis is formed in the cylindrical portion at the front end,
A knock slider having a first guide projection provided on the outside of the cylindrical portion; and a linear first cam groove along the center axis and the center, the slide portion of the knock slider being slidable. A linear second cam groove which is inclined with respect to an axis and guides and slides the first guide projection is formed, a guide cylinder fixed to the body, and housed inside the cylindrical portion of the knock slider, A second guide projection is provided which moves forward and backward along the central axis, abuts and slides on the slider cam surface, and is slid and guided in the first cam groove. A composite writing instrument comprising a slider provided. 2. The center axis line corresponding to the centering knock engaging portion for the mechanical pencil, wherein a centering knock engaging portion for a mechanical pencil is formed on the slider cam surface. A composite writing implement characterized in that a knock groove is formed along the groove.