JPS5852956Y2 - Knotsuku style pencil - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a knock-type mechanical pencil in which the length of the guide pipe that protrudes from the tip of the tip can be freely adjusted.

Conventional knock-type mechanical pencils are commercially available, including those in which a guide pipe is fixed to the base so that the protruding length of the guide pipe is always constant, and those in which the guide pipe slides within the base.

If the guide pipe is fixed to the mouthpiece, if the protruding length is long, the knock-type mechanical pencil will be easily damaged if it is dropped, and if the protruding length is short, the ruler will be damaged when it is applied to a ruler to draw a line. Due to its thickness, it had drawbacks such as the core being easy to break and making it difficult to draw lines accurately.

On the other hand, with sliding guide pipes, when writing, the guide pipe gets caught on the paper surface, making it difficult to write, or when you apply a ruler to draw a line, the ruler slides and goes out, causing the lead to protrude for a long time. Or, as the core wore out, it often did not move and scratched the surface of the paper, making it completely impossible to use it for drawing purposes.

Therefore, the protruding length of the guide pipe that can protrude from the tip of the tip can be adjusted, as in Utility Model Publication No. 51-27850, by adjusting the screw engagement between the tip and the guide pipe to increase or decrease the protruding length. Or, as in Utility Model Application Publication No. 50-76933, by attaching and detaching the screw of the tip, the tightening member holds or releases the guide pipe, and the protrusion length from the tip of the guide pipe is increased. Adjusted version, Jikosho 5127
There is a model such as No. 855 in which resistance is provided between the tip and the guide pipe and the protrusion length is adjusted by pressing the guide pipe, but there are also models such as Utility Model Publication No. 51-27850 and Utility Model Application Publication No. 50-7.
In the case of threaded fittings such as No. 6933, when the threading loosens during writing, the protruding length of the guide pipe changes and looseness occurs between the guide pipe and the tip, making it unusable for practical use. However, those with resistance as in Utility Model Publication No. 51-27855 have large variations in resistance, and the guide pipe moves easily, and if the guide pipe is moved frequently, the resistance weakens. Both of them have had many practical problems.

This invention adjusts the protruding length of the guide pipe by rotating a tip screwed onto the connector.

To explain the structure of this invention, in FIG. 1, a tightening ring 3 is externally fitted onto a tapered portion 2A of a chuck 2 fixed to a core tank 1, and the tightening ring 3 is loosely fitted into a concave portion 4A of a connector 4. has been done.

Then, due to the elastic force of the chuck spring 5 provided between the core tank 1 and the connector 4, the taper portion 2A of the chuck 2 is
is pressed against the tightening ring 3 and closed inward to hold the core 6, thereby forming a mechanism body.

This mechanism body is configured such that it cannot rotate but can slide due to the hexagonal flange 4B of the connector 4 and the hexagonal hole 7A of the shaft 7, which are part of the mechanism body, and the hexagonal flange 4B The return spring 8, which has a stronger resiliency force than the chuck spring 5, is stretched between the shaft 7B and the shaft 7B of the shaft 7, and is pushed rearward.

The cap 9, which has a guide pipe 10 fixed to its tip 9A and has a core holder 11 built therein, is screwed into the small-diameter screw portion 4C of the connector 4.

Further, the cap 9 and the slidable tip 12 strongly abut against the shaft 7 due to the elastic force of the return spring 8 screwed into the large diameter screw portion 4D of the connector 4.

Next, to explain the case of increasing the protruding length of the guide pipe 10, first, the core tank 1 is knocked against the elastic force of the chuck spring 5, and after the core tank 1 and the connector 4 are brought into contact with each other, By knocking the core tank 1 against the elastic force of the return spring 8 and moving the coupling tool 4 forward, the tip 12 and the shaft 7 are separated.

In this state, by rotating the tip 12 clockwise and screwing it deeply into the large diameter threaded part 4D of the coupling 4, the relative position with the cap 9 screwed into the small diameter threaded part 4C of the coupling 4 is shifted and the guide is removed. The protruding length of the pipe 10 becomes longer.

Then, when the hook is released, the tip 12 is brought into strong contact with the shaft 7 due to the elastic force of the return spring 8, resulting in the state shown in FIG. 2.

On the other hand, if the protruding length of the guide pipe 10 is to be shortened, the tip 12 may be rotated counterclockwise after knocking the core tank 1 in the same manner as described above.

As explained above, in order to change the protruding length of the guide pipe 10, the tip 12 is rotated left and right to deepen or shallow the threaded engagement with the large diameter threaded portion 4C of the connector 4. In this case, the initial deposit is 1 due to the elastic force of the return spring 8.
Since the rear end 12A of 2 is always strongly abutted against the front end 7C of the shaft 7, the tip 12 will not loosen during writing.

FIG. 3 shows another embodiment for attaching a tip, in which a protrusion 112B is provided at the rear end of the tip 112 and a recess 107D is provided at the front end of the shaft 107.
It is a combination of D.

FIG. 4 shows another embodiment of attaching the tip, in which the rear end 212A of the tip 212 is configured to have an uneven shape, and a rubber O-ring 13 is fixed to the front part of the shaft 207. The rear end 212A of the gold 212 is bitten into the rubber O-ring 13.

By configuring as shown in Figures 3 and 4 above, the tip can be securely attached to the shaft, and normally the threaded connection between the tip and the connector does not rotate at all, but can be easily rotated if necessary. It was made so that it could be done.

As explained above, this invention is very convenient because by rotating the tip, the protruding length of the guide pipe can be easily adjusted according to the purpose, such as making it longer for drafting or shorter for carrying. Moreover, it has a great practical effect in that the lead does not loosen when carrying or writing.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main parts of the knock-type mechanical pencil of this invention, Fig. 2 is a longitudinal sectional view of the main parts of the knock-type mechanical pencil of Fig. 1 with the guide pipe protruding, and Fig. 3 is a longitudinal sectional view of the main parts of the knock-type mechanical pencil of this invention. FIG. 4 is a plan view of the main part showing another embodiment of the knock-type mechanical pencil of this invention, and FIG. 4 is a partial sectional view of the main part showing another embodiment of the knock-type mechanical pencil of this invention. 1... Core tank, 2... Chuck, 2
A... Part of the taper of chuck 2, 3...
・Tightening ring, 4...Connection tool, 4A...
Recessed portion of connector 4, 4B...Hexagonal collar portion of connector 4, 4C...Large diameter screw portion of connector 4, 4D...
...Small diameter screw part of coupling tool 4, 5...Chuck spring, 6...Core, 7,107,207.
...Shaft, 7A...Hexagonal hole of shaft 7, 7B.
...Axis installation of shaft 7, 7C...Front end of shaft 7,
107D... Concavity of shaft 107, 8...
Return spring, 9...Base, 9A...
... Tip of base 9, 10 ... Guide pipe,
11... Core holder, 12, 112, 212.
... Advance payment, 12A, 212A ... Advance payment 1
2, rear end of 212, 112B... convex portion of tip 112, 13... rubber O-ring.

Claims (1)

[Scope of utility model registration request] In a knock-type mechanical pencil that gradually draws out the lead by knocking, the cap to which the guide pipe is fixed is screwed into the small-diameter screw part of the connector, and the large-diameter screw part of the connector has a tip that is movable relative to the cap. A return spring, which is screwed together so that it can be moved an appropriate distance and has a stronger repulsive force than the chuck spring that repulses the chuck backwards, is stretched between the shaft installation and the connector, so that the tip is strongly attached to the shaft. A knock-type mechanical pencil characterized by having a guide pipe that abuts against the tip and protrudes from the tip.