JP3052328U - Magnetic pen - Google Patents

Abstract

(57) [Problem] To provide a magnetic pen in which a magnet core material is hard to fall off. A support shaft (13) for supporting a magnet core (12) is provided at a tip of a pen body (10), and an insertion hole (25) is formed in the tip of the support shaft (13) in the axial direction. Alternatively, the magnet core 12 is inserted into the insertion hole 25 of the support shaft 13, and the distal end of the support shaft 13 is caulked so that the peripheral end 13 a of the support shaft 13 becomes the magnet core Twelve curved surfaces were engaged.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a magnetic pen, and more particularly, to a magnetic pen in which a magnet core material is unlikely to fall off a pen body.

[0002]

[Prior art]

 Conventionally, a magnetic pen has a concave portion formed at the tip of a metal support shaft, a magnet core material is fitted into the concave portion, and the tip of the support shaft is caulked to hold the magnet core material on the support shaft. However, when used for a long period of time, the caulking force is weakened and the magnet core material may fall off the support shaft. Therefore, the support shaft is made of plastic, and a fitting hole is formed at the tip of the support shaft. A proposal has been made in which a magnet core is inserted into the hole so that the magnet core does not fall off the support shaft.

[0003]

[Problems to be solved by the invention]

 However, since the support shaft and the magnet core material are made of different materials and have different temperature coefficients of expansion and contraction, the fitting may be loosened over a long period of use, and the magnet core material may fall off the support shaft. There was a risk that children could swallow the material, and there was a need for a proposal for a magnetic pen in which the magnet core material was more securely fixed to the support shaft.

An object of the present invention is to solve the above problems and to provide a magnetic pen in which a magnet core material is hard to fall off.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the magnetic pen according to the present invention is moved by bringing a magnet core material provided at the tip into contact with the surface of a magnetic panel composed of a collection of small chambers containing a viscous fluid and magnetic powder. Accordingly, the magnetic powder in the small chamber is attracted to the surface side of the magnetic panel, and the following requirements are provided for displaying pictures, characters, and the like by the attracted magnetic powder. (A) A metal support shaft for supporting the magnet core is provided at the tip of the writing instrument body, and an insertion hole is formed in the tip of the support shaft in the axial direction. (B) The magnet core is (C) When the magnet core material is inserted into the insertion hole of the support shaft and the tip of the support shaft is caulked, the peripheral end of the support shaft is fixed to the magnet. Engagement with the curved surface of the core material The magnetic core material may be formed in a prismatic shape.

It is preferable that the support shaft is made of brass so as not to be magnetized.

The rear end of the magnet core may have the same shape as the front end so that it can be easily inserted into the support shaft.

[0008]

[Embodiment of the invention]

 In FIG. 1, reference numeral 1 denotes a magnetic pen according to the present invention. As shown in FIG. 2, this magnetic pen 1 is a magnetic panel in which small chambers 4 each containing a viscous fluid 2 and a magnetic powder 3 are gathered in a plane. By moving the magnetic pen 1 with the tip of the magnetic pen 1 in contact with the surface of the magnetic panel 5, the magnetic powder 3 in the small chamber 4 is attracted to the surface of the magnetic panel 5 to display pictures and characters. The pen tip is composed of a hexagonal cylindrical pen body 10 and a tapered pen tip 11. The pen tip 11 has a magnet core 12 and a support for supporting the magnet core 12. A shaft 13, a spring 14 for urging the support shaft 13 toward the front end, and a rear end of the spring are engaged to accommodate the magnet core 12, the support shaft 13 and the spring 14 in the pen point 11. And a fixing member 15 for fixing the spring 14 in a compressed state. It is.

The pen tip 11 has a hole 16 formed at a tip thereof for projecting a tip of the support shaft 13, and a stopper 17 formed on the support shaft 13 is engaged behind the hole 16. A step 18 is formed, and the support shaft 13 urged by the spring 14 is formed so as to protrude from the tip of the pen tip 11 by a predetermined length. A hexagonal cylinder 19 is formed at the rear of the pen tip 11 so as to protrude rearward, and the cylinder 19 is formed in a size that allows the pen body 10 to be fitted.

The magnet core material 12 is formed in a cylindrical shape with a magnet made of an alloy of samarium and cobalt, and the tip a is curved as shown in FIG. 3 (a) or as shown in FIG. 3 (b). The peripheral end b is formed in a curved surface and has a length equal to or slightly protruding from an insertion hole 25 formed in the support shaft 13 described later.

The magnet core 12 may be formed in a prismatic shape as shown in a plan view of FIG. 4A and a side view of FIG. 4B. By making the magnet core material into a prismatic shape, the manufacture of the magnetic core material can be facilitated.

The support shaft 13 is formed of a non-magnetized brass and has a round shaft shape, an insertion hole 25 is formed in the longitudinal direction at the tip 13a, and a stopper 17 is provided around the rear portion in the longitudinal direction. The front end of a spring 14 is interposed in the rear portion 13b of the support shaft 13 projecting rearward from the front. The support shaft 13 urged forward by this spring 14 The support shaft 13 is formed so as to engage with the portion 18 to prevent the support shaft 13 from coming off the pen tip 11 and to protrude a predetermined length. Then, as shown in FIGS. 3A and 3B, after the magnet core 12 is inserted into the insertion hole 25, the magnet core 12 is caulked so as not to come off from the support shaft 13. The peripheral end 13a of the magnet core 12 covers a part of the curved surface portion of the magnetic core material 12, and the inner diameter L1 of the peripheral end 13a is deformed so as to be smaller than the diameter L2 of the magnet core material. It curves so as to be in close contact with the curved surface and becomes tapered.

The fixing member 15 has a columnar shaft body, an engagement projection 26 is formed at the tip, and a flange 27 is formed at the rear end. After inserting the support shaft 13 and the spring 14 into the cylindrical portion 19 of the pen tip 11, the fixing member 15 pushes the tip of the fixing member 15 into the cylindrical portion 19 until the flange 27 abuts on the edge of the cylindrical portion. The portion 27 is fixed to the rear end of the cylindrical portion 19 with an adhesive, and is formed so that it can be inserted into the pen body 10 together with the cylindrical portion 19 with the fixing member 15 fixed to the pen tip 11.

Next, the order of assembling the magnetic pen 1 will be described. First, after inserting the magnetic core material into the insertion hole 25 of the support shaft 13, the tip of the support shaft 13 is swaged. Since the magnetic core material has a curved surface at the peripheral end, the upper portion of the support shaft 13 is curved on the same curved surface as the magnetic core material 12 so as to be in close contact with the curved surface of the magnetic core material, so that the support shaft 13 is tapered. And securely hold the magnetic core.

The support shaft 13 holding the magnetic core is inserted from the rear of the pen tip 11 such that the tip protrudes from the hole of the pen tip 11. Subsequently, the spring 14 is inserted into the cylindrical portion 19 so that the front end of the spring 14 comes into contact with the rear surface of the stopper 17 of the support shaft 13, the fixing member 15 is further inserted into the cylindrical portion 19, and the engaging projection is formed at the rear of the spring 14. After the spring 14 is compressed and pressed until the flange of the fixing member 15 comes into contact with the opening of the cylinder 19, the fixing member 15 is fixed to the cylinder 19 with an adhesive. In this state, the support shaft 13 is urged forward by the spring 14, the front surface of the stopper 17 comes into contact with the step portion 18, and the front portion of the support shaft 13 projects a predetermined length (FIG. 5). (See (a)).

The pen tip 11 assembled as described above is inserted into the pen main body 10 together with the adhesive from the rear end of the cylindrical portion 19 and fixed to the pen main body 10, whereby the assembly of the magnetic pen 1 is completed. (See FIG. 5B).

The magnetic pen 1 assembled as described above is caulked after supporting the magnetic core material on the support shaft, so that the tip of the support shaft 13 is bent so as to be in close contact with the curved surface of the magnet core material 12. Since the tapered state occurs, the magnetic core material is simply inserted into the insertion hole of the support shaft, or the support shaft is caulked so as to be pressed against the side surface of the magnetic core material. The holding force becomes strong, and the magnetic core material can be reliably prevented from falling off from the support shaft.

In addition, since the support shaft is made of brass, the peripheral end is in close contact with the curved surface of the magnet core material when caulked, and the magnetic flux does not spread more than the magnetic core material because it is not magnetized by the magnet core material. Fine characters and pictures can be drawn on the magnetic panel.

Further, when the tip (magnet core material) of the magnetic pen is pressed against the magnetic panel with a predetermined force or more, the spring contracts and absorbs the pressure, so that unnecessary pressure is not applied to the magnetic panel. Troubles that damage the panel can also be avoided.

[0020]

[Effect of the invention]

 According to the invention of claim 1, since the tip of the support shaft is bent so as to be in close contact with the curved surface of the magnet core material and becomes tapered, only the magnetic core material is fitted into the insertion hole of the support shaft. Compared to a conventional product or a product with a support shaft that is crimped to the side of the magnetic core material, the force for holding the magnetic core material is stronger and the magnetic core material can be reliably prevented from falling off from the support shaft. Can be.

According to the second aspect of the present invention, since the magnet core is formed in a prismatic shape, the manufacture becomes easy.

According to the third aspect of the present invention, since the support shaft for holding the magnet core is made of non-magnetized brass, the magnetic flux does not spread more than the magnetic core, so that fine characters or fine characters can be displayed on the magnetic panel. You can draw pictures.

According to the invention of claim 4, since both ends of the magnet core are formed with the same curved surface, when the magnet core is inserted into the insertion hole of the support shaft, it is easy to insert and the magnet core is inserted. There is no need to check the direction of material insertion, and the efficiency of assembly work can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a magnetic pen according to the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a magnetic panel.

FIGS. 3A and 3B are cross-sectional views of a main part illustrating a relationship between a magnetic core material and a support shaft.

FIGS. 4A, 4B, and 4C are plan views, front views, and cross-sectional views of main parts illustrating a state where a support shaft is swaged, showing another example of a magnetic core material.

FIGS. 5A and 5B are cross-sectional views of main parts for explaining the assembly of the magnetic pen.

[Explanation of symbols]

 Reference Signs List 1 magnetic pen 2 viscous fluid 3 magnetic powder 4 small chamber 5 magnetic panel 10 pen body 11 pen tip 12 magnetic core 13 support shaft 25 insertion hole

Claims (4)

[Utility model registration claims] The magnetic powder in the small chamber is moved by bringing a magnet core material provided at the tip into contact with the surface of a magnetic panel composed of an aggregate of small chambers enclosing a viscous fluid and magnetic powder. A magnetic pen, characterized by having the following requirements for drawing on a surface side of a magnetic panel and displaying pictures, characters, and the like using the sucked magnetic powder. (A) A support shaft for supporting the magnet core material is provided at the tip of the pen body, and an insertion hole is formed in the tip of the support shaft in the axial direction. (B) The magnet core material has a tip or (C) the magnet core material is inserted into the insertion hole of the support shaft,
When the tip of the support shaft is caulked, the peripheral end of the support shaft should engage with the curved surface of the magnet core material. 2. The magnetic pen according to claim 1, wherein the magnet core is formed in a prism shape. 3. The magnetic pen according to claim 1, wherein said support shaft is made of brass. 4. The magnetic pen according to claim 1, wherein a rear end of the magnet core has the same shape as a front end.