JPS6234795Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention particularly relates to an improvement of an extrusion type sharpening pencil using a metered core feeding method.

In extrusion type sharp pencils, which have been widely known for a long time, the amount of core feeding by one extrusion operation is constant, so the length of the writing core that protrudes from the tip of the barrel is constant, and it can be adjusted to suit the user's individuality. It was impossible to write with a protrusion length that was suitable and easy to use.
Therefore, for example, for users who write with strong pen pressure, a writing lead with a long protruding length is inconvenient as it frequently causes the lead to break. If the writing lead is short, the writing lead will be consumed quickly and the extrusion operation will need to be repeated frequently, which is inconvenient. In addition, for users who write with weak pressure, a writing lead with a long protruding length is
There is a disadvantage that the writing lead may break when the writing pressure is increased, and if the protruding length of the writing lead is short,
This is inconvenient as it requires frequent extrusion operations.

The present invention was developed by focusing on extrusion type sharp pencils that use the well-known fixed amount feeding method. When adjusting the protruding length of the writing lead, rotate the rotary cylinder provided on the shaft cylinder to move it in the axial direction, thereby adjusting the axial movement distance of the tightening ring. A convenient sharp pencil in which the writing lead protrudes by the adjusted length suitable for the user's writing by adjusting the amount of core feed by the chuck and tightening ring determined by the above, and performing a writing extrusion operation after the adjustment. The purpose is to provide.

To explain the embodiment with reference to the drawings, a movable core case 2 is accommodated in the shaft cylinder 1 so as to be movable in the axial direction,
A hollow operator 10 for pushing out the writing lead is detachably attached to the end of the lead case, and the operator is made to protrude from the end of the shaft tube 1. A hollow tube joint 11 is attached to the tip of the movable core case 2, and a connector pipe 12 is connected via this joint, and a chuck 3 is attached to the tip of the pipe.
Concatenate. Thus, the chuck 3 is connected to the tip of the movable core case 2 via the tube joint 11, the connector pipe 12, etc., and the chuck is configured to be movable in the axial direction together with the movable core case 2. . The tip of the chuck 3 is configured to be able to expand and contract in the centripetal direction and centrifugal direction, and is covered with a tightening ring 4. When the chuck 3 is fitted into this ring, it contracts in the centripetal direction and grips the writing lead, and when it comes out, it moves in the centrifugal direction. Expand it to release the writing lead. Between the shaft tube 1 and the movable lead case 2, there is a retraction spring 5 for pushing out the writing lead.
This spring is connected to the movable core case 2.
The movable core case 2, chuck 3, tightening ring 4, etc. are placed between the tube joint 11 attached to the tip of the shaft cylinder 1 and the chuck sleeve 13 formed inside the shaft cylinder 1, and the movable core case 2, chuck 3, tightening ring 4, etc. (Upward in FIGS. 1 to 4) so that the chuck 3 is always fitted into the tightening ring 4. Therefore, the outer diameter of the tip of the shaft cylinder 1 is made slightly larger, and a stepped portion 14 is formed on the outer surface, and a screw 15 is carved on the outer periphery of the larger diameter portion. The rotary tube 6 is screwed onto the screw 15 of the shaft tube 1 so as to be movable in the axial direction, but the inner diameter of the tip of the rotary tube 6 is made slightly larger to form the engagement surface 16. At the same time, a screw 17 is carved on the large diameter inner surface, and this screw is screwed into the screw 15 of the shaft cylinder 1. The rotating tube 6 is screwed onto the shaft tube 1, the engagement surface 16 is opposed to the stepped portion 14 of the shaft tube 1, and a variable distance ₁ is provided between the step portion 14 and the engagement surface 16.
The distal end portion of the rotary tube 6 is made to protrude from the distal end portion of the shaft tube 1, and a tip 7 is configured to be screwed into the tip portion of the rotary tube 6. The tip 7 that is screwed into the tip of the rotating tube 6 has an inner hole 8 and a step 9, and by screwing into the rotating tube 6, the inner hole 8
A chuck 3 and a tightening ring 4 are fitted inside the chuck 3 so as to be movable in the axial direction, and when the chuck 3 and tightening ring 4 move in the axial direction, the ring is stopped by the stepped portion 9, and the chuck 3 is stopped. It is configured to escape from the tightening ring 4, expand in the centrifugal direction, and release the gripped writing lead. The tip end 7 is screwed into the rotary tube 6 until its end abuts the tip of the shaft tube 1, and is inserted between the chuck 3 and the tips of the tightening ring 4 and the stepped portion 9 in the axial direction of the tightening ring 4. A moving distance of ₂ is provided. this distance
₂ moves the rotary tube 6 in the axial direction by a variable distance ₁ , and when the engagement surface 16 of the rotary tube 6 engages with the stepped portion 14 of the shaft tube 1, the tip 7 moves by the variable distance ₁ . The directional movement results in a new axial movement distance ₃ of the tightening ring 4, with a related change by a variable distance of ₁ minute. This moving distance ₃ is a variable distance
₁ and the axial movement distance ₂ of the tightening ring 4, and the axial movement distance of the tightening ring 4 becomes longer.
Therefore, the moving distance of the chuck 3, which is fitted into the tightening ring 4 and gripping the writing lead, until the writing lead is released is also increased by the variable distance of ₁ minute, and the amount of lead feeding by the chuck 3 increases, and the tip The length of the writing lead that can protrude from 7 also becomes longer. (Fig. 3, 4 → 5
6 and 7) Next, to explain how to use it, the axial movement distance of the tightening ring 4 is ₂ in the unused state shown in FIG.
However, at this moving distance ₂ , the operator 1
When the chuck 3 and the tightening ring 4 are pushed and operated, the tightening ring 4 moves by the above-mentioned moving distance ₂ and stops by stopping at the stepped portion 9, as shown in FIG. continues to move and escape from the tightening ring 4, expanding in the centrifugal direction and releasing the writing lead that was being gripped. The released writing lead protrudes from the nib 7, and the protrusion length is the distance from when the chuck 3 starts moving together with the clamping ring 4 until it escapes from the chuck 4, that is, in the axial direction of the clamping ring 4. Travel distance ₂
The dimensions are equivalent to .

If the case of adjusting the protruding length of the writing lead is explained with reference to FIGS. 5 to 7, these figures
This figure shows an example of adjusting the short protrusion length in the figure to a long protrusion length.

In FIG. 3, the rotary cylinder ₆ is rotated, and as shown in FIG. 7 is moved by a variable distance of ₁ minute to separate from the shaft cylinder 1. Even if the rotary tube 6 and the tip 7 move in the axial direction, the chuck 3 and the tightening ring 4 do not move in conjunction with each other and stay at the original position shown in FIG. Step 9 inside mouth 7
The axial movement distance ₂ of the tightening ring 4 between
changes to a new axial movement distance ₃ , which is the variable distance ₁ added to this movement distance. Since this movement distance ₃ is the sum of the variable distance ₁ and the movement distance ₂ , it is longer than this movement distance ₂ by the variable distance ₁ , and therefore, the axial movement distance of the chuck 3 and the tightening ring 4. is also lengthened by variable distance ₁ , the amount of core feeding increases by this distance, and the protruding length of the writing lead also increases by this distance, so that it protrudes by a dimension corresponding to a new axial movement distance ₃ .

As is clear from the above explanation, by adjusting the variable distance ₁ , the protruding length of the writing lead can be adjusted. That is, if the rotating barrel 6 is rotated so that the engagement surface 16 of the rotating barrel 6 does not engage with the stepped portion 14 of the shaft barrel 1 and is slightly moved in the axial direction, the variable distance ₁ can be changed. Since the writing lead can be moved over a short distance, the protruding length of the writing lead can be slightly increased, allowing fine adjustment.

Therefore, the protruding length of the writing lead can be freely adjusted within the movement limit of the variable distance ₁ .

Further, the variable distance ₁ can be set by adjusting the degree of screwing of the tip 7 into the rotary tube 6 to be shallow or deep.

Next, another embodiment shown in FIGS. 8 and 9 will be described. This embodiment differs from the embodiment shown in FIGS. 3 to 7 in that the chuck sleeve 13 is The method of use is the same as that of the embodiment shown in FIGS. 3 to 7, except that they are constructed as one body at the front end.

In the two embodiments shown in FIGS. 3 to 9,
A spring 18 provided in the tip 7 is brought into elastic contact with the tip of the barrel 1 or the end face of the chuck sleeve 13, but this spring is used to slow the rotation of the rotating barrel 6 with respect to the barrel 1. This prevents the rotary cylinder 6 from naturally rotating and moving in the axial direction during writing. This is also to prevent the tip 7 from loosening with respect to the rotary tube 6. but,
This spring 18 does not necessarily need to be provided. Incorporate it as necessary.

Still another embodiment is shown in FIGS. 10 and 11, and this embodiment shows a configuration in which the arrangement position of the spring 18 explained in the previous two embodiments is changed. The spring 18 in this embodiment is
It is disposed on the inner surface of the rotating cylinder 6 between the end of the screw 17 and the locking surface 16, and one end is brought into elastic contact with one end of the large diameter portion of the shaft cylinder 1. In this way, the rotation of the rotating barrel 6 with respect to the shaft barrel 1 is slowed down, and the rotating barrel 6 is prevented from rotating and moving in the axial direction during writing.
However, this spring 18 does not necessarily need to be provided, and may be incorporated as necessary.

Since the present invention is configured as described above, by rotating the rotary tube provided on the shaft tube to move it in the axial direction, the tip can be moved at the same time. Therefore,
It becomes possible to adjust the axial movement distance of the tightening ring within the tip, and the amount of centering by the chuck and tightening ring, which is determined by this movement distance, can be adjusted.

Therefore, if the user rotates the rotating cylinder,
The projecting length of the writing lead can be adjusted, and the writing lead can be written at a projecting length suitable for oneself, and the risk of lead breakage can be greatly reduced, and frequent extrusion operations can be eliminated.
We can provide convenient products.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the inventive mechanical pencil in an unused state, Fig. 2 is a front view showing it in a used state,
Fig. 3 is an enlarged longitudinal sectional front view of the main part showing the non-use state, Fig. 4 is the same front view of the main part showing the writing lead extrusion operation, and Fig. 5 is the main part showing the writing lead protrusion length adjustment operation. FIG. 6 is a front view of the main part showing the writing core extrusion operation after adjusting the protrusion length of the writing core;
Fig. 7 is a front view of the main part showing a usage state in which the protrusion length of the writing lead is adjusted; Fig. 8 is a front view of the main part showing another embodiment; Fig. 9 is a front view of the main part showing the protrusion of the writing lead. FIG. 10 is a longitudinal sectional front view of the main part showing another embodiment, and FIG. 11 is a front view of the main part showing the length adjustment operation of the writing lead. It is a diagram. In the figure, 1 is a shaft cylinder, 2 is a movable core case, 3 is a chuck, 4 is a tightening ring, 5 is a retraction spring, 6 is a rotating cylinder, 7 is a tip, 8 is an inner hole, 9 is a stepped part, ₁ is the variable distance, and ₂ is the axial movement distance of the tightening ring.

Claims (1)

[Scope of utility model registration request] A chuck 3 is connected to the tip of the movable lead case 2 housed in the barrel 1, a tightening ring 4 is placed on the tip of the chuck, and a writing lead extrusion operation is provided between the barrel 1 and the movable core case 2. A retraction spring 5 is interposed, and a rotary tube 6 is screwed onto the outer periphery of the shaft tube 1 so as to be movable in the axial direction. A variable distance ₁ is provided, the base of the tip 7 is screwed into the tip of the rotary tube 6, and an inner hole 8 is formed in the tip so that the chuck 3 and the tightening ring 4 are fitted so as to be movable in the axial direction. , constitutes a step 9 in which the tightening ring 4 is locked in the inner hole 8, and the variable distance ₁ is provided between this step and the tip of the chuck 3 and the tip of the tightening ring 4.
The axial movement distance of the tightening ring 4 changes in conjunction with
An extrusion type mechanical pencil characterized by having ₂ parts.