JP3729497B2 - Drawing compass - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drawing compass, and more particularly to a means for removing the risk of paper damage and finger puncture by the central needle.
[0002]
[Prior art]
The conventional drawing compass uses a center needle as a fulcrum for drawing a circle, so a hole is opened in the paper by that needle, and if the fulcrum is replaced many times, the number of holes increases or the hole expands, causing severe damage to the paper . Also, the fulcrum often shifts. There was also the risk of pointing the finger with the needle while handling the compass. In order to solve such disadvantages, in the conventional drawing compass, a cylindrical portion is provided on the needle leg of the compass and a holding rod holding the central needle is slidably stored in the cylindrical portion (for example, Patent Documents). 1).
[0003]
In addition, a flat plate compass is formed by fitting a connecting support member with a writing instrument insertion block and a connecting support fixing block to the center of a rotary disk with scales, and further fitting it into a cradle. There is. (For example, see Utility Model Document 1.)
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-31496
[Utility model document 1]
Japanese Utility Model Publication No. 7-21394 [0006]
[Problems to be solved by the invention]
The invention of Japanese Patent Laid-Open No. 11-314496 is effective to store the central needle in the needle leg when the compass is not used and prevent finger puncture by the needle, but still uses the needle as a fulcrum, so that the needle is stuck on the paper. Will remain and needle displacement will also occur.
[0007]
The disk-shaped flat type compass of Japanese Utility Model Publication No. 7-21394 does not have a central needle, so there is no problem due to the needle. However, the compass itself is bulky and lacks portability, so it is difficult to store and carry with a writing instrument.
[0008]
Therefore, the present invention aims to improve these points and to provide a compass with excellent portability.
[0009]
[Means for Solving the Problems]
The compass according to claim 1 is composed of a support leg, a writing leg, and a pivot part for connecting the leg so as to be openable and closable. The support base attached to the tip of the support leg is a dome made of a transparent material having a diameter smaller than the diameter of the flat plate in the center of a disk-shaped flat plate made of a transparent material with a slip stopper on the back and depicting a center point. And the upper part is covered with a dome-shaped lid that is open in a circular shape. Next, a circular movable part having a diameter larger than the diameter of the circular opening of the lid of the support base and bent so as to follow the rim of the dome is integrally formed at the tip of the support base, and this is formed on the support base. The dome is slidably fitted into the gap between the dome and the lid.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An optimum embodiment of a drawing compass according to claim 1 will be described with reference to the drawings.
[0013]
FIG. 1 is a front view showing a state in which a compass 1 according to the present invention is opened.
[0014]
The compass 1 includes a support leg 2, a writing leg 3, and a pivot part 4 that connects the leg 2 so as to be opened and closed. A writing instrument holding rod 5 that holds the writing instrument 7 is attached to the tip of the writing leg 3, and the writing instrument holding rod fastening member 6 is fastened or released so that the writing instrument 7 can be removed.
[0015]
FIG. 2 is an enlarged sectional view of the tip end of the support base 8 which is a feature of the present invention. FIG. 3 is a back view of the same.
[0016]
The support base 8 is slightly smaller than the diameter of the disk 8 at the center of a disk-shaped flat plate 14 made of a transparent material (plastic, synthetic resin, etc.) with a rubber or cloth non-slip 11 attached to the peripheral edge of the back surface. A dome 9 made of a transparent material having a diameter is formed, and the upper portion 10a is covered with a dome-type lid 10 opened in a circular shape.
[0017]
Next, the transparent circular movable part formed at the tip of the support leg 2 has a slightly larger diameter than the diameter of the circular opening 10 a of the lid 10, and is bent so as to follow the periphery of the dome 9.
[0018]
After the circular movable portion 13 is put on the transparent dome 9 of the support leg support base 8, the lid 10 is put on, and the tip portion 2a of the support leg 2 is fitted into the concave portion 13a at the center of the circular movable portion. The support leg 2 and the circular movable portion 13 can be integrally formed.
[0019]
The circular movable portion 13 slides between the lid 10 and the dome 9 without detaching from the support base 8, and the support 2 is tilted in all directions together with the circular movable portion 13.
[0020]
A center point 12 serving as a guide for positioning is drawn on the disk-shaped flat plate 14.
[0021]
Next, another embodiment of the compass described in claim 1 will be described. FIG. 4 is a front view showing a state where the compass 14 that can be easily carried is folded, and FIG. 5 is a front view showing the folded state.
[0022]
The compass 14 includes a support leg 15, a writing leg 16, and a pivot part 17 that connects the leg so as to be openable and closable. The support leg 15 and the writing leg 16 are formed in a U-shape that is open toward the center in the cross section so that the respective folding parts can be stored therein.
[0023]
A folding support leg 18 is rotatably connected to the tip of the support leg 15 by a connecting member 20, and a folding writing part 19 is rotatably connected to the tip of the writing leg 16 by a connecting member 21. A supporting leg support 22 is formed at the tip of the folding supporting leg 18.
[0024]
The support base 22 is a disc-shaped flat plate made of a transparent material with a rubber or cloth non-slip attached to the peripheral edge of the back surface, and a center made of a transparent material having a diameter slightly smaller than the diameter of the disc. -Form a mud. Furthermore, this is covered with a dome-shaped lid whose upper part is opened circularly.
[0025]
The transparent circular movable part formed at the tip of the folding support leg 18 has a diameter slightly larger than the diameter of the circular opening of the lid, and is bent so as to follow the periphery of the dome.
[0026]
A transparent dome formed at the center of the disk-shaped flat plate is covered with a circular movable portion, and then a cover is placed thereon, and the front end portion of the folding support leg 18 is fitted into a concave portion at the center of the circular movable portion.
[0027]
The circular movable part slides in the gap between the lid and the dome without detaching from the support base, and the folding support legs 18 and the support legs 15 tilt in all directions together with the circular movable part.
[0028]
A convex part 18a is formed at one upper end of the folding support leg 18, and the folding support leg 18 is taken out. When in use, the convex part 18a abuts and locks against the back of the support leg 15 to limit the rotation of the folding support leg 18. . Similarly, a convex part 19a is formed at the upper end of the folding writing part 19, and the writing part 19 is taken out. When in use, the convex part 19a abuts against the back of the writing leg 16 to be locked, and the folding writing part 19 rotates. Is limited.
[0029]
When the upper part of the support leg 15 and the writing leg 16 is cut away and the folding support leg 18 is folded, the support leg support 22 is stored.
[0030]
【The invention's effect】
Since the needle is not used to determine the fulcrum of drawing, the paper is not damaged without making a hole in the paper, and the finger is not punctured by this needle. Further, since the back surface is provided with a non-slip, the fulcrum does not shift.
[Brief description of the drawings]
FIG. 1 is a front view showing a state in which a compass according to claim 1 is opened.
FIG. 2 is an enlarged cross-sectional view of a compass support base.
FIG. 3 is a back view of the same.
FIG. 4 is a front view showing a state in which the compass according to claim 1 formed to be foldable is opened.
FIG. 5 is a front view showing the folded state.
[Explanation of symbols]
1, 14, drawing compass 2, 15, support leg 3, 16, writing leg 4, 17, pivoting part 8, 22, support leg support 14, disk-shaped flat plate 9, transparent dome 10, lid 10a, lid Open rear part 13, support leg rotating part 11, anti-slip 18, folding support leg 19, folding writing part 20, 21, connecting member

Claims (1)

A compass support base that is composed of a support leg, a writing leg, and a pivot that connects the leg to the opening and closing position.
A dome made of a transparent material having a diameter smaller than the diameter of the flat plate is formed in the center of a disk-shaped flat plate made of transparent material with a non-slip on the back and a center point drawn, and the upper part is opened circularly Covered with a dome-shaped lid,
A circular movable part having a diameter larger than the diameter of the circular opening of the lid of the support leg support and bent so as to follow the periphery of the dome is formed integrally with the tip of the support leg, and this is formed on the support leg support base. A drawing compass characterized by being slidably fitted into the gap between the lid and the lid;

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