JPH0721394U - compass - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a flat-plate compass that does not need to make holes in the paper when drawing a circle or arc and does not use a pointing device, a protractor, or the like. [Structure] Attach a block with a writing implement insertion port to the round bar and a block to fix the round bar, attach it to a rotating disc with scale scale, and then re-fit it into the pedestal from above to attach it. As described above, the wheel lid is attached from above to form a flat plate type compass.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flat plate type compass on which a circle can be written with a mechanical pencil or a needle pen.

[0002]

[Prior art]

 The conventional compass has a bifurcated shape with a metal needle attached to one side and a pencil lead or a crow mouth attached to the other.

[0003]

[Problems to be solved by the present invention]

 Since the conventional compass uses a hole to punch the paper with a needle, if you repeatedly hit the needle at the center point, the hole will expand and hurt the paper, and you will need a pointing device and a protractor to determine the radius and angle. It had the drawback of being expensive.

In view of the above-mentioned conventional drawbacks, the present invention has an object to provide a flat plate type compass capable of determining the size and angle of a circle without using a needle and without using a pointing device or a protractor.

Other objects and novel features will be apparent from reading the following description with reference to the accompanying drawings.

[0006]

[Means for Solving the Problems]

 Insert a rotatable disc with a scale of reduced scale and double scale into a pedestal that receives it, mount it from above, cover the disc with an angled scale from above the disc, and connect it to the supporting material. A block with a writing instrument insertion port is attached to the other end, and a block for fixing the slide of this connecting support material is attached, and this block is fitted on the rotating disc.

[0007]

[Action]

 For the flat plate type compass constructed as described above, slide the block with the writing instrument insertion port fixed to the connecting support to match the scale scale, and tighten the round bar with the butterfly bolt located at the center of the disc. , You can draw a circle by pushing the disc while inserting the tip of the writing instrument into the writing instrument slot.

[0008]

[Examples of the present invention]

 Hereinafter, the present invention will be described in detail based on embodiments of the drawings.

In the embodiment shown in FIGS. 1, 2 and 3, the rotary disk 8 is placed on the receiving base 9 so as to be fitted into the stepped inner portion from above, and the rotary disk 8 is pushed from above in this state. Put on the ring lid 1. The rotary disk 8 is provided with scales, scales, etc., and the wheel cover 1 is provided with angular scales. The wheel cover 1, the rotary disk 8, and the pedestal 9 are all made of a transparent material.

A cylindrical convex portion is integrally formed with the rotary disc 8 at the center of the rotary disc 8, and a block 7 of a rotatable supporting member 4 is fitted therein, and a writing instrument is inserted. The block 5 with the mouth 10 is fitted into a rectangular hole cut out in the circumferential direction from the center of the rotating disk 8. Scale marks are attached to the edges of the rectangular holes, and round head tacks 11 are attached to the bottom surface of the central portion of the rotating disk 8.

The connecting support member 4 is fitted into the groove formed in the rotatable block 7, and the butterfly bolt 2 is attached by covering the block 3 that holds the connecting support member 4 from above. A block 5 with a writing tool insertion port 10 is attached to the tip of the connection support member 4, and a nut 6 is used for tightening and fixing. The radius of the circle is a flat plate shape that allows you to draw a circle by moving the block 5 of the writing instrument insertion port 10 according to the scale of the rotating disc 4, sliding the connecting support 4 and tightening and fixing the butterfly bolt 2. Compass.

[0012]

[Effects of the Invention] From the above description, the invention has the following effects.

A circle can be easily drawn with a writing instrument, a needle hole cannot be formed in the center of the paper, and the paper is not damaged, and the rotary disk 8 is supported by a round-head tack 11 and separated from the paper surface. It has the effect of not getting dirty.

The rotary disk 8 has a plurality of scales and scales of multiple scales, and the block 5 with the writing instrument insertion port 10 can be fitted into a rectangular hole, so that the scale can be freely and easily selected. is there.

By arranging the block 5 with the writing instrument insertion port 10 on the scale of the wheel lid 1 having the scale of the angle, the angle can be easily selected and a partial arc or curve can be drawn. .

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view of an embodiment of the present invention.

FIG. 3 is a perspective view of an embodiment of the present invention.

FIG. 4 is a three-dimensional exploded view of the present invention.

[Explanation of symbols]

 1 Wheel Cover 2 Butterfly Bolt 3 Connection Support Material Holding Block 4 Connection Support Material 5 Writing Tool Insert Block 6 Nut 7 Connection Support Material Receiving Block 8 Rotating Disc 9 Cradle 10 Writing Tool Mouth 11 Round Head Tack

Claims (1)

[Scope of utility model registration request] 1. A block in which a writing instrument insertion port and a block for fixing the linking support are mounted and attached to a connecting support, and the combined state is fitted into the central portion and a rectangular opening of a rotary disc with scale graduations. , The rotary disc with the built-in scale graduation is mounted on the cradle from above so that it can be rotated, and the wheel cover with the angle scale is covered so that it does not come off from the cradle when the rotary disc is rotated. Compass characterized by that.