JPH0226697Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a sharp pencil in which a split chuck is press-fitted into a resin core case.

(Prior art) As a conventional sharpening pencil, for example, the first
As shown in the figure, there is one in which a split chuck A is press-fitted into a resin core case B and is elastically locked.

However, in such a conventional sharp pencil, in order to press fit the split chuck A into the resin core case B, an inclined guide surface A1 is formed on the outer periphery of the tip of the split chuck A. As shown in the figure, the lead C easily rides on the top A2 of the guide surface A1. Therefore, if the lead case B is charged with even a small amount of static electricity, the lead case B
There was a problem in that the lead C rested on the top A2 while in close contact with the inner peripheral surface of the chuck A, and was difficult to fall into the split chuck A.

(Purpose of the invention) The present invention was created by focusing on these problems, and it prevents the lead from touching the top of the split chuck, even when the lead case is charged with a considerable amount of static electricity. It is an object of the present invention to provide a sharp pencil whose lead is smoothly introduced into a split chuck.

(Structure of the invention) In order to achieve this purpose, in this invention,
In a sharp pencil in which a split chuck is press-fitted into a resin core case, the lead case is formed of an extruded tube with a length extending from the head of the barrel to the tip and has a constant inner diameter, and is made of metal. A lead guide member is fixed to the inner periphery of the distal end of the lead case, and one end of the lead guide member has a smaller diameter than the lead entrance of the split chuck, and the other end has a smaller diameter than the lead entrance of the split chuck, so that the lead guide member guides the lead to the lead entrance of the split chuck. The sharpening pencil is characterized in that the end thereof is formed with an inclined guide surface connected to the inner periphery of the lead case.

By simply fitting the lead guide member into a lead case made of an extruded tube that can be manufactured at low cost, the lead can be smoothly guided, and static electricity can be released to prevent the lead from becoming stagnant.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIGS. 2 and 3 show an embodiment of the present invention, in which inside the barrel 10 of the sharpening pencil 1,
A core case 2 made of resin is slidably inserted. The core case 2 is formed by an extruded tube.

A spring 1 is installed between the shaft tube 10 and the core case 2.
1 is interposed therebetween, and the shaft tube 10 and the core case 2 are connected by a bellows 12.

As shown in FIGS. 2 and 3, the core case 2
A three-piece chuck 3 as a split chuck is press-fitted into the tip of the holder, and an engaging claw 31 of the three-piece chuck 3 is locked to the core case 2. A metal lead guide bush 4 is fixed to the inner periphery 20 of the lead case 2 as a metal lead guide member for guiding the lead to the lead inlet 32 of the three-piece chuck 3. The lead guide bush 4 has one end on the three-part chuck 3 side having a smaller diameter than the lead entrance, and the other end formed with an inclined guide surface connected to the inner periphery of the lead case 2 so as to guide the lead to the lead entrance 32 of the three-part chuck 3. ing.

As shown in FIG. 2, a fastener 5 is fitted onto the chuck portion 33 of the three-piece chuck 3 to restrict opening and closing of the chuck portion 33. As shown in FIG.

A cap 6 is screwed onto a threaded portion 10A formed at the tip of the shaft tube 10.
Inside, there is a holding chuck 61 and a tip pipe 62.
are fixed to each other, and a stepped portion 6A is formed on which the tip of the fastener 5 comes into contact.

An eraser 7 is provided on the inner periphery of the rear end of the lead case 2.
An eraser stopper 70 to which is fixed is inserted, and a cleaning needle 71 is fixed to the tip of the stopper 70.

A knob cover 8 is fitted onto the outer periphery 22 of the rear end of the core case 2, and a cap 9 is fitted onto the outer periphery of the tip of the shaft tube 10.

In the sharpening pencil 1 having the above configuration, by raising the sharpening pencil 1 as shown in FIG.
and falls into the three-split chuck 3 from the core entrance 32. At this time, even if the core case is charged with a large amount of static electricity, the metal core guide bush 4
As a result, static electricity in the vicinity easily escapes, so the lead passes through the lead guide bush 4 and directly falls smoothly into the three-split chuck 3.

Then, with the lead inserted into the three-split chuck 3, the lock cover 8 is attached to the spring 11.
When pressed against the urging force of , the bellows 12 contracts, and the core case 2, fastener 5, and three-split chuck 3 are displaced to the left in FIG. During this displacement process, when the tip of the fastener 5 comes into contact with the stepped portion 6A of the cap 6, the three-split chuck 3 is further displaced to the left, leaving the fastener 5 behind, and is released from the restriction by the fastener 5, so that the chuck Section 33 opens. Then, when the knob cover 8 is released, the spring 11
The lead case 2, the three-piece chuck 3, and the fastener 5 return to the right, and the chuck portion 33 is closed again by the fastener 5.

In this way, by pressing the knock cover 8 several times, the lead is fed into the open chuck part 33, and by closing the chuck part 33, the lead is held.

In this state, each time the chuck cover 8 is pressed once, the chuck portion 33 is displaced to the left by a predetermined amount and then opens.
Release the core you were holding. In this way, the wick is advanced by a predetermined amount and projects outwardly through the holding chuck 61 and the tip pipe 62.

In the above embodiment, the core guide bush 4 is provided at a position in contact with the end of the three-piece chuck 3, but the core guide bush 4 may be provided slightly away from the end of the three-piece chuck 3.

(Effect of the invention) According to the sharp pencil according to the invention, the lead in the lead case is guided by the lead guide member so that it falls from the lead entrance into the split chuck, and the lead is guided by the lead guide member so that it falls into the split chuck. Therefore, static electricity easily escapes, so even if the lead case is charged with a considerable amount of static electricity, the lead in the lead case will directly fall smoothly into the split chuck through the lead guide member.
Since an extruded tube can be used for the lead case, the performance of the sharp pencil can be improved with almost no increase in cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part showing a conventional example, and FIGS. 2 and 3 show an embodiment of the present invention.
The figure is a plan view in which the upper half is shown in cross-section, and FIG. 3 is a cross-sectional view of the main part. 1...Sharp pencil, 2...Resin core case, 3...Three-split chuck (split chuck), 4
...metallic core guide bush (metallic core guide member), 20...inner periphery of the core case, 32...core inlet.

Claims (1)

[Scope of Claim for Utility Model Registration] A sharp pencil in which a split chuck is press-fitted into a resin core case, wherein the lead case is an extruded pencil having a length extending from the head of the barrel to the tip and having a constant inner diameter. A metal lead guide member is fixed to the inner periphery of the tip of the lead case, and the lead guide member is attached to one end on the split chuck side so as to guide the lead to the core inlet of the split chuck. A sharp pencil characterized in that the diameter is smaller than the lead inlet, and the other end is formed with an inclined guide surface connected to the inner periphery of the lead case.