JPH0237588Y2 - - Google Patents

Description

[Detailed explanation of the invention] Conventionally, angle rulers (protractors) have been made of semicircular or circular transparent plates. The angle was measured, a measurement point was placed there, and then a diagonal line was drawn connecting this point to the standard using a straight ruler. In order to draw a diagonal line in this way, two separate operations are required: measuring the angle and drawing the diagonal line, and in order to measure the angle, with a conventional angle ruler, the diameter of the ruler is approximately the same as that of the ruler. It would be nice to have one, but one that is extremely shorter than the diameter of the ruler,
It was impossible or extremely difficult to measure objects longer than a ruler.

SUMMARY OF THE INVENTION An object of the present invention is to provide an angle ruler that can draw diagonal lines at the same time as measuring angles, and that can easily measure angles regardless of the length of the object to be measured.

The structure of the present invention consists of a fixed scale, an angle arm swingably provided on the fixed scale, and a scale plate swingably provided at the tip of the angle arm. The center of swing between the fixed plate and the angle arm is a reference point located on one long side of the fixed plate, and the center of swing between the angle arm and scale plate is a specific point on the long side of the angle arm. There is also an angle scale displayed on the scale plate to indicate the degree of obliqueness of the angle arm.

Therefore, according to the present invention, when drawing a desired diagonal line or measuring a certain angle, the scale plate and the fixed scale are crossed at right angles.

Embodiments of the present invention will be described based on the drawings. A shaft support plate 1b is integrally formed to protrude from one long side 1a of the fixed scale 1, and a shaft hole is bored in this shaft support plate at a place where it intersects with the long side. A shaft support plate 2b integrally protrudes from one long side 2a of the shaft support plate 2, and a shaft hole is bored in this shaft support plate where it intersects with this long side. The fixed scale and the angle arm are swingably connected by inserting a pin 3 into the shaft hole. Therefore, the center of swing between the fixed length 1 and the angle arm 2 is the center A of this pin, which serves as the reference point for the fixed length, and angles are formed on both sides of the long side 1a around this reference point. A scale 1c is displayed.

Furthermore, the long side 2a of one side of the transparent angle arm 2
A shaft support plate 2c is also integrally formed to project from the distal end of the shaft support plate, and a shaft support hole is bored at a location where the shaft support plate intersects with the long side. On the other hand, a shaft support hole is also bored at the tip of the transparent scale plate 4, and by aligning this shaft support hole with the shaft support hole of the angle arm 2 and inserting a pin 5, the scale plate can be opened. is swingable with respect to the angle arm, and the center of this pin is a specific point B. On the scale plate 4, a scale 4a indicating the inclination angle of the long side 2a of the angle arm 2 is displayed. The angle of inclination of the angle arm can be accurately determined. In particular, if a reference line 4b is drawn from the specific point B on the scale plate 4 and this line is aligned with the angle scale 1c of the fixed scale 1, more accurate measurements can be made.

Now when drawing a 30 degree diagonal line, mark 4a on scale plate 4.
``30'' should be aligned with the long side 1a of the fixed length 1. At this time, the reference line 4b of the scale plate 4 is set to the scale 1 of the fixed scale 1.
When it matches "30" of c, this scale plate intersects the fixed scale at an accurate right angle, allowing accurate measurement of an angle of 30 degrees. Therefore, a diagonal line may be drawn along the long side 2a of the angle arm 2.
Of course, to initially install the fixed length 1 at a predetermined position, the center A may be used as a reference point, and the long side 1a of the fixed length may be used as a reference line. Further, if a dimension scale 2d is displayed on the angle arm 2, a diagonal line can be drawn at a desired length.

Since the present invention has the above-mentioned configuration, it is possible to immediately draw a diagonal line based on the inclination angle of the angle arm just by aligning the scale on the scale plate, and the angle can be easily measured regardless of the length of the diameter of the object to be measured. When not in use, it folds into a straight line, making it compact and convenient to carry.

[Brief explanation of drawings]

The drawing is a plan view showing an embodiment of the present invention. A...Reference point, B...Specific point, 1...Fixed length,
1a...long side, 1c...angle scale, 2...angle arm, 2a...long side, 3...pin, 4...scale plate, 4a...scale.

Claims (1)

[Scope of utility model registration request] A fixed scale that displays an angle scale from a reference point located on one long side is connected to the fixed scale so that it can swing freely around the reference point located on one long side of the fixed scale.
An angle arm with a dimensional scale displayed from the reference point, and a reference line drawn from this specific point and an angle arm that is swingable around a specific point on the tip of the long side of the angle arm. and a transparent scale plate displaying an angle scale for displaying the angle of inclination of the fixed scale and the angle scale, and the fixed scale and the angle scale are intersected to intersect the two angle scales to measure the angle and at the same time measure the angle line. Angle ruler to draw.