JPH09156286A - Knock type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knock type writing utensil enabling simplification of the shape of components and having a simple structure. SOLUTION: A triangular engagement member 3 having a first corner part 31, a second corner part 32 and a third corner part 33 and a ball 4 are held, together with a refill 2 sprung toward the tail end side, in a holder tube 1 having an engaging step 13 formed inside. The second corner part 32 engages with the engagement step 13, while the third corner part 33 comes into contact with the inner peripheral surface of the holder tube 1, and a writing pressure is thereby received. When a knocking member 5 is pressed, the ball 4 makes the engagement member 3 rotate, the engagement of the second corner part 32 with the engaging step 13 is thereby canceled, the engagement member 3 moves back therewith and a writing part 21 withdraws into the holder tube 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock-type writing instrument in which a writing portion at the tip of a refill protrudes from a tip opening of a barrel when a knock member is pressed.

[0002]

2. Description of the Related Art When a knock member protruding from the tail end opening of a shaft cylinder is pressed, the writing portion at the tip of the refill protrudes from the tip opening of the shaft cylinder to enable writing, and when the knock member is pressed again, the writing portion at the tip of the refill is pressed. As a knock-type writing instrument that is immersed in the barrel, a rotary knock-type writing instrument has been widely put into practical use.

In a rotary knock type writing instrument, a predetermined number of vertical ribs are formed on the inner peripheral surface of a shaft cylinder to form grooves between the vertical ribs, and side projections of the rotor which abut the tail end of the refill. The rotor is moved forward in a state where the rotor is fitted in this groove and a knocking operation applies a rotational force to the rotor by a knocking operation. As a result, the refill advances and the writing part at the tip projects from the tip opening of the shaft cylinder. At this time, the side projection of the rotor comes out of the groove, and the rotor rotates, for example, 120 ° to the tip edge of the vertical rib. Lock and receive writing pressure. Then, when the knocking operation is performed again, the rotor is rotated again by 120 ° and the side projections of the rotor are fitted into the grooves formed by the vertical ribs and retracted, and the writing portion at the tip of the refill is retracted into the barrel. To do.

[0004]

As described above, in the rotary knock type writing instrument, since it is necessary to apply a rotational force to the rotor by the knock member, the shapes of the rotor and the knock member are complicated, and However, since it is necessary to form a predetermined number of vertical ribs in the barrel, there is a problem that the entire structure becomes complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a knock type writing instrument which can simplify the shape of parts and has a simple structure.

[0006]

In order to achieve the above object, the present invention provides a shaft cylinder having a locking step formed on the inner surface thereof.
A knock member that accommodates a triangular locking member having a first corner portion, a second corner portion, and a third corner portion and a ball together with a refill that is elastically ejected to the tail end side, and that protrudes from the tail end opening of the barrel. When is pressed, the locking member whose first corner is in contact with the tail end surface of the refill advances the refill, the writing portion at the tip of the refill projects from the tip opening of the barrel, and the second corner of the locking member moves toward the shaft. When engaging the locking step of the cylinder, the third corner of the locking member abuts the inner peripheral surface of the shaft cylinder to receive the writing pressure, and when the knock member is pressed again, the ball moves to the third corner of the locking member. The locking member is rotated by pressing the portion to release the engagement between the second corner of the locking member and the locking step of the shaft cylinder, the locking member retracts, and the writing portion at the tip of the refill is the shaft. Be immersed in the cylinder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. The drawing shows an example in which the present invention is applied to a ball-point pen. In FIG. 1, a shaft cylinder 1 formed of a synthetic resin is a cylindrical body having a tip opening 11 and a tail end opening 12 and has a medium wall thickness. A locking step 13 is formed on the inner surface of the portion. Further, a refill guide portion 14 having a small inner diameter is formed on the front side of the locking step 13, and a ball guide portion 15 formed of an inclined surface is formed on the tail end side of the locking step 13.

A ball-point pen refill 2 having a writing portion 21 at its tip is housed in the barrel 1 in a state of being elastically bulged to the tail end side by a spring 6, and to the tail end side from the refill 2. The locking member 3 and the ball 4 are housed. The locking member 3 has a first corner portion 31 whose tip has an arc shape,
It is a plate-shaped body having an equilateral triangle having a second corner portion 32 and a third corner portion 33. And the length of one side of the locking member 3 is
It is larger than the inner diameter of the barrel 1 in which the locking member 3 is housed. Further, the bottomed tubular knock member 5 projects from the tail end opening 12 of the shaft cylinder 1 in a state where the knock member 7 is elastically ejected toward the tail end side by the knock flap 7.

As shown in FIG. 1, when the writing portion 21 at the tip of the refill 2 projects from the tip opening 11 of the barrel 1, the first corner portion 31 of the locking member 3 is the spring 6 and the tail end side. The second corner portion 32 is locked to the locking step 13 of the shaft cylinder 1 by abutting on the tail end surface of the refill 2 which is elastically ejected. Therefore,
A clockwise moment is applied to the locking member 3 having a triangular shape whose one side is longer than the inner diameter of the shaft cylinder 1, with the locking step 13 serving as a fulcrum, and in that state, the third corner 33 causes the shaft to move. Since it abuts on the inner surface of the cylinder 1, the locking member 3 cannot be rotated anymore and is locked. Therefore, the locked locking member 3 receives the writing pressure and writing becomes possible.

The operation of retracting the writing part 21 of the refill 2 into the barrel 1 will be described with reference to FIG. 2. When the locking part 3 is locked, the upper side of the locking member 3 is the third corner part. The ball 4 is in contact with the vicinity of the third corner portion 33 of the locking member 3 because the ball 4 is inclined with 33 on the lower side. When the knock member 5 is pressed in this state, the tip of the knock member 5 pushes down the vicinity of the third corner 33 of the locking member 3 via the ball 4. Therefore, as shown by the phantom line in FIG. 2A, the locking member 3 slightly rotates counterclockwise, and the engagement between the second corner 32 and the locking step 13 is released.

When the knocking member 5 is released from the pressure, the knocking member 5 elastically bulged to the tail end side by the knocking spring 7 moves to the tail end side, but as shown in FIG. The disengaged locking member 3 moves to the tail end side, and the refill 2 also moves to the tail end side. Then, the ball 4 enters the knock member 5 along the ball guide portion 15, and as shown in FIG. 3, the second corner 32 of the locking member 3 is knocked by the knock member 5.
The writing portion 21 of the refill 2 is retracted into the barrel 1 by coming into contact with the tip of the and stopping.

Next, an operation of projecting the writing portion 21 of the refill 2 from the tip end opening 11 of the barrel 1 from the state shown in FIG. 3 will be described with reference to FIG. 4, and when the knock member 5 is pressed, FIG. ), The tip end of the knock member 5 advances the locking member 3 in a state in which a clockwise moment is applied. That is, the second corner 32 of the locking member 2 advances along the inner surface of the barrel 1, and when it further advances, the second corner 32 engages with the locking step 13 as shown in FIG. 4 (B). Together with
The writing portion 21 of the refill 2 projects from the tip end opening 11 of the barrel 1. Then, when the pressing of the knock member 5 is released,
The knock member 5 moves to the tail end side, returns to the state shown in FIG. 1, and writing becomes possible.

[0013]

As described above, the knock type writing instrument of the present invention uses the triangular locking member and the ball, and disengages the corner portion of the locking member from the locking step of the barrel. Since the writing portion of the refill is projected and retracted from the opening of the tip of the barrel, the shape of the parts can be simplified, and a knock-type writing instrument having a simple structure can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where a writing portion of a refill projects from a tip opening of a barrel.

FIG. 2 is an operation explanatory diagram of immersing the writing portion of the refill in the barrel.

FIG. 3 is a cross-sectional view showing a state where a writing portion of a refill is immersed in a barrel.

FIG. 4 is an operation explanatory diagram of causing the writing portion of the refill to project from the tip end opening of the barrel.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 11 Tip opening of a shaft cylinder 12 Tail end opening of a shaft cylinder 13 Locking step 2 Refill 21 Writing part 3 Locking member 31 1st corner 32 Second corner 33 3rd corner 4 Ball 5 Knocking member

Claims (1)

[Claims] 1. A first corner portion and a second corner, together with a refill elastically ejected toward the tail end, in a barrel having a locking step formed on its inner surface.
A triangular locking member having a corner and a third corner and a ball are housed, and when the knock member protruding from the tail end opening of the shaft cylinder is pressed,
The locking member whose first corner is in contact with the tail end surface of the refill advances the refill, the writing portion at the tip of the refill projects from the tip opening of the barrel, and the second corner of the locking member locks the barrel. When engaging the step and the third corner of the locking member abuts the inner peripheral surface of the barrel to receive the writing pressure and presses the knock member again, the ball presses the third corner of the locking member. To rotate the locking member,
A knock-type writing instrument characterized in that the engagement between the corner portion and the locking step of the shaft cylinder is released, the locking member retracts, and the writing part at the tip of the refill is retracted into the shaft cylinder.