JPH088875Y2 - Mechanical pencil with eraser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) A mechanical pencil with an eraser having a retracting mechanism for the core and the eraser so that the core protrudes from the tip and the eraser protrudes from the rear end.

(Prior Art) A mechanical pencil with an eraser has been known for a long time. A rod-shaped eraser which doubles as a lid of the core chamber is attached to the rear end of the core chamber in a protruding state as necessary.

On the other hand, in recent years, the quality of the eraser has improved, so that not only the timely use but also the eraser can be protruded as desired so that the use as the eraser can be more sufficiently performed. What has been done is attracting attention.

The protrusion of the eraser utilizes a mechanism generally referred to as a rotary feeding type in which the eraser protrudes when the front shaft and the rear shaft are mutually rotated.

(Problems to be solved by the invention) The rotary feed-out type mechanism has been used for the protrusion of the core in the rotary mechanical pencil, but it is troublesome for the user who is accustomed to knocking operation in terms of the operation. Is left.

Therefore, an object of the present invention is to provide a mechanical pencil with an eraser in which the protrusion of the eraser can be performed by a knocking operation.

(Means for Solving the Problems) The present invention is a mechanical pencil with an eraser having a retracting mechanism for the core and the eraser so that the core protrudes from the front end and the eraser protrudes from the rear end. The chuck body that moves in conjunction with the chamber is biased rearward and placed in the front shaft, and the chuck body that moves in conjunction with the eraser chamber that is integrated with the core chamber is biased forward and moved in the rear shaft. The outline is a mechanical pencil with an eraser that is slidably connected to the front shaft and the rear shaft.

(Example) An example is shown in the attached FIG. In the following description, the left side of the drawing will be referred to as the front and the right side of the drawing will be referred to as the rear.

Reference numeral 1 is a front shaft, 2 is a lead protection tube, 3 is a core detent elastic body, 4 is a lead, 5 is a chuck body, 6 is a chuck ring, and 7 is an elastic member for urging the chuck body 5 backward. is there.
Since the mechanism for retracting the core 4 by these members is well known, its explanation is omitted.

A core chamber 8 is connected to the chuck body 5, and the core chamber 8 projects from the rear end of the front shaft 1 to form a large diameter portion 9. At the end of the large diameter portion 9, a chuck body 10 is provided. is there. In this chuck body 10, the elastic member 11 urges a rear shaft, which will be described later, rearward, and the rearward urging of the rear shaft also urges a chuck ring, which will be described later, rearward. In this specification, this is used to mean that the chuck body is biased forward, and the eraser 12 is held. In this example, the urging force of the elastic member 11 is sufficiently smaller than the urging force of the elastic member 7. Further, reference numeral 13 is a chuck ring for applying a tightening force to the chuck body 10, and a member that locks the chuck ring 13 is a rear shaft 14. The rear shaft 14 is slidable with respect to the front shaft 1, and the rear end hole thereof receives resistance due to the elasticity of the eraser 12. That is, the eraser 12 itself temporarily holds itself like the core detent elastic body 3.

In using this example, the following is done.

First of all, to make the core protrude, erase the front shaft 1 with an eraser.
Press 12. Since the eraser 12 is gripped by the chuck body 10, the pressing force applied to the eraser causes the large diameter portion 9,
It is transmitted to the core chamber 8, and the chuck body 5 is advanced against the backward bias of the elastic member 7. The protrusion of the lead 4 by this is the same as that in a general mechanical pencil.

Further, in order to cause the eraser 12 to project, the front shaft 1 is pressed against the rear shaft 14. As described above, since the rearward biasing force of the elastic member 7 is sufficiently stronger than the forward biasing force of the elastic member 11, the core 4
The chuck body 5 presses the core chamber 8 and the large-diameter portion 9 toward the rear while holding the
The chuck body 10 is moved backwards against the forward bias. This causes the eraser 12 to project from the rear shaft 14.

In the above example, when the rearward biasing force of the elastic member 7 is not sufficiently stronger than the forward biasing force of the elastic member 11, the core 4 also protrudes when the eraser 13 protrudes.
That is, it is possible to project them at the same time.

Next, another example is shown in FIG. In this example, the core chamber 8 and the large-diameter portion 9 are separate bodies. The chuck body 5 and the core chamber 8 are similar, but the members may be appropriately integrated or made into multiple parts. Large diameter part 9 of this example
This forms the eraser chamber 15. Further, the front end of the eraser chamber 15 has a recessed portion 16.

Further, the front shaft 1 and the rear shaft 14 in this example are similar to those in the above-described example in that they can slide, but they can be attached and detached as desired. An example in which the front shaft and the rear shaft are appropriately connected so that they can slide with respect to each other is shown.However, in the present embodiment, the rear shaft 14 and the rear shaft are The shaft 14 is set to serve as a cap for the front end of the front shaft 1. A projection 17 is formed on the outer wall of the front part of the front shaft 1 for fitting when used as a cap. Also,
The recessed portion 16 at the front end of the eraser chamber 15 serves as a housing portion for the lead protection tube 2. It is of course easy to allow the eraser 12 to project even in this cap state. It is only necessary to secure the slidability between the front shaft 1 and the rear shaft 14 in the capped state. Further, if the rear end of the core chamber 8 is projected from the front shaft 1 as shown in the figure, the core 4 can be easily projected in the separated state.

Although the two examples have been described above, the present invention can be appropriately modified without departing from the gist of the present invention. For example, although the chuck body 10 directly grips the eraser 12, it is also possible to attach a support having a rod-shaped portion to the rear portion of the eraser 12 and grip the rod-shaped portion of the support.
It is also possible to make the diameter of the rod-shaped body equal to the diameter of the core 4 so that the chuck body 5 and the chuck body 10 are made into a common component. Also,
It is also possible to use a ball chuck mechanism. In FIG. 2, it is also possible to provide a removable plug body for accommodating the core 4 at the rear end of the core chamber 8.

(Effect of the invention) The mechanical pencil with eraser of the present invention projects the core from the front end and the eraser from the rear end.
A mechanical pencil with an eraser that has a retractable mechanism for the core and the eraser. The chuck body that moves in conjunction with the core chamber is biased rearward and placed in the front shaft to be integrated with the core chamber. Since the chuck body that moves in conjunction with the eraser chamber is biased forward and placed in the rear shaft, and the front shaft and the rear shaft are slidably connected, not only the protrusion of the core but also the eraser The protrusion can also be performed by a knock operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing another embodiment. DESCRIPTION OF SYMBOLS 1 ... Front shaft, 2 ... Core protection tube, 3 ... Core detent elastic body, 4
... core, 5 ... chuck body, 6 ... chuck ring, 7 ... resilient member, 8 ... core chamber, 9 ... large diameter part, 10 ... chuck body, 11 ... resilient member, 12 ... eraser, 13 ... chuck ring, 14 ... rear shaft, 15 ... eraser chamber, 16 ... recessed portion, 17 ... protrusion.

Claims (1)

[Scope of utility model registration request] 1. A mechanical pencil with an eraser having a retracting mechanism for the core and the eraser so that the core protrudes from the front end and the eraser protrudes from the rear end, and the chuck moves in conjunction with the core chamber. The body is biased backwards and placed in the front shaft, and the chuck body that moves in conjunction with the eraser chamber integrated with the core chamber is biased forward and placed in the rear shaft. Mechanical pencil with eraser that is slidably connected to the shaft.