JP2514903Y2 - mechanical pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mechanical pencil having a lead holder for holding a lead in a barrel.

(Prior Art) A description will be given with reference to FIGS.

A tip metal 3 having a core detent 2 arranged therein is screwed to the tip of the barrel 1. A chuck body 11 holding a core L ₂ is urged rearward by a spring 12 and movably arranged in the barrel 1. Further, when the chuck body 11 is retracted, the chuck body 11 is closed, and when the chuck body 11 is advanced, the fitting is disengaged, and the chuck ring 13 for expanding the chuck body 11 is used.
The core holding portion 11a is arranged so as to be movable.

 The operation will be described.

FIG. 5 is a view showing a normal writing operation, that is, the chuck body.
11 In front of the lead L _{1 that has} come off the lead holding part 11a (hereinafter, the remaining lead L ₁
) Is located, and the lead L ₂ (hereinafter referred to as the succeeding lead L ₂ ) that follows is held in the lead holding portion 11a. Here performs clicking operation when the chuck body 11 is advanced while maintaining the subsequent core L _2, also advance the residual core L ₁ against the frictional resistance of the core detent 2 along with its advanced. When the chuck body 11 advances to a certain extent, the fitting of the chuck ring 13 is released, and the chuck body 11
Expands and releases the holding of the trailing core L ₂ (see FIG. 6).
Next, when the knock operation is released, the chuck body 11 retracts. In the course of this backward movement, it abuts the rear end of the core holding portion 11a to the subsequent core L ₂ (see FIG. 7) is retracted slightly trailing core L ₂ (see FIG. 8). At this time, the residual core L ₁ is not moved by the holding force (friction force) of the core detent 2.

(Problems to be Solved by the Invention) As described above, when the residual core L ₁ and the subsequent core L ₂ are knocked, a gap X is formed between the residual core L ₁ and the subsequent core L ₂ .
When writing in this state, since the general writing pressure is equal to or greater than the frictional force of the core detent 2, the remnant core L ₁ retreats by the length of the gap X and there was a very strange feeling.

(Means for Solving the Problem) In the present invention, a movable body having at least one pair of side walls movable in the longitudinal direction of the barrel is urged backward by the first elastic member inside the barrel. A core holding member, which is slidable in the radial direction inside the moving body and is biased in the central direction by the second elastic member, and a pressing member for sliding the core holding member. The gist is that the pressing member is disposed in the cylinder and the pressing member is biased rearward by the third elastic member.

(Embodiment) An explanation will be given based on the operation explanatory views shown in FIG. 1 to FIG.

A tip metal 3 having a core detent 2 arranged therein is screwed to the tip of the barrel 1. A movable body 4 having side walls 4a and 4b at both ends is slidably arranged in the tip metal 3, and the movable body 4 is biased rearward by a first elastic member 5. A step portion 3a that regulates sliding in the longitudinal direction is formed in the tip metal 3. Furthermore, in the moving body 4, inclined surfaces 6 are provided on both sides.
A core holding member 6 on which a and 6b are formed and a second elastic member 7 for urging the core holding member 6 in the radial direction are arranged. In addition, a pressing member 9 biased rearward by a third elastic member and having a core tank (not shown) is slidably arranged in the shaft cylinder 1 rearward. The tip 9a of the pressing member 9 is in contact with the inclined surfaces 6a and 6b, and the core holding member 6 moves in the radial direction in conjunction with the movement of the pressing member 9 in the longitudinal direction.

The elastic force of the second elastic member 7 is set to be stronger than the core holding force of the core detent 2 and the elastic force of the first elastic member 5.

 Next, the operation will be described.

When a knock operation is performed in a state where the lead detent 2 holds the residual lead L ₁ and the lead holding member 6 holds the subsequent lead L ₂ (see FIG. 1), the tilt formed on the lead holding member 6 Faces 6a, 6b
Is pressed by the pressing member 9 to move the lead holding member 6 forward and the trailing lead L ₂ and the residual lead L ₁ to move forward, and the moving body 4 is moved to the first position.
The elastic repellent member 5 is moved forward while being compressed. At this time, as described above, the elastic force of the second elastic member 7 is set to be stronger than the core holding force of the core detent 2 and the elastic force of the first elastic member 5, so that the core is retained. The member 6 does not move in the radial direction (expanding direction). When the knocking operation is further continued, the front end of the moving body 4 comes into contact with the step portion 3a formed in the tip metal 3. When the core holding member 6 is further pressed after the end of contact, the inclined surfaces 6a, 6
b is expanded by the movement of the tip 9a of the pressing member 9
It spreads out against the elastic member 7 (see FIG. 2). Since the first elastic member 5 is urged rearward at the same time when it is expanded, the moving body 4 and the core holding member 6 retreat and return to their original positions (see FIG. 3). Then, when the knocking operation is released, the pressing member 9 is retracted, and the lead holding member 6 is reduced in diameter by the second elastic member 7 to hold the succeeding lead L ₂ again.

(Operation) During or after knocking, the lead holding member expands before the writing by the pressing member, returns in the expanded state, and then the knocking operation is released to hold the lead.

(Advantages of the Invention) In the present invention, a movable body having at least one pair of side walls movable in the longitudinal direction of the barrel is disposed inside the front of the barrel while being biased rearward by the first resilient member. A core holding member which is slidable in the radial direction in the movable body and is urged toward the center by a second elastic member, and a pressing member for sliding the core holding member is arranged in the barrel. Since the pressing member is biased rearward by the third resilient member, no gap is created between the residual core and the subsequent core, and good writing can be performed even when writing the residual core. .

[Brief description of drawings]

1 to 3 are half sectional views of essential parts showing an embodiment of the present invention, and FIG. 4 is a perspective view showing a positional relationship between a moving body, a lead holding member and a pressing member. 5 to 8 are half-sectional views showing a conventional technique. 1 ... Shaft cylinder, 2 ... Core detent, 4 ... Moving body, 5 ...
1st elastic-repellent member, 6 ... core holding member, 7 ... 2nd elastic-repellent member, 8 ... 3rd elastic-repellent member, 9 ... pressing member

Claims (1)

(57) [Scope of utility model registration request] 1. A movable body having at least one pair of side walls movable in the longitudinal direction of the barrel is disposed inside the barrel in a forwardly biased manner by a first resilient member, and the movable body is also provided. A core holding member that is slidable in the radial direction and that is urged in the center direction by the second elastic member, and a pressing member that slides the core holding member is arranged in the barrel. A mechanical pencil characterized in that the member is biased rearward by a third elastic member.