CN101837705A - Multifunctional angulometer - Google Patents

Abstract

The invention relates to a multifunctional angulometer which belongs to the technical field of school supplies. The multifunctional angulometer is provided with a hollow right-angle sector main scale, a rotary vernier, a shift vernier, a pen cap and a clip, wherein the inner side and the outer side of each of the two right-angle side plates are respectively provided with length scales; the circular arc side is provided with an arc guide groove; the outer edge of the circular arc side is provided with angle scales; one end of the rotary vernier is hinged at the right angle in the main scale, and the other end of the rotary vernier is provided with a pointer; the tip of the pointer is provided with a button pin which is inserted into the arc guide groove; the middle part of the rotary vernier is provided with a linear guide groove with length scales; both the hinge and the pointer are on the central line of the linear guide groove; the shift vernier is provided with length scales; one end of the shift vernier and the pen cap are articulated with the tip of the pointer of the rotary vernier through the button pin; and the clip is clamped on one right-angle side plate of the main scale. The invention has the advantages of simple structure, easy production and manufacture, low cost, multiple functions, and convenient and flexible operation.

Description

multi-purpose protractor

technical field

The invention relates to a protractor for learning and work, in particular to the structure of a multi-purpose protractor with the functions of a protractor, a triangle ruler, a ruler and trigonometric function calculation functions.

Background technique

Protractors, triangular rulers and rulers are necessary tools for large, middle and primary school students and engineering technicians to draw pictures. These existing tools are generally independent single pieces, with many pieces and many sharp corners, so it is inconvenient to carry and store. At the same time, the cost is high, the tools are scattered and inconvenient to use. Trigonometric functions and the Pythagorean theorem are also knowledge that students must learn, but the calculation and memory of the trigonometric functions and the Pythagorean theorem are cumbersome, and usually can only be solved by looking up tables and complex calculations. If there is a drawing tool on the market that uses less drawing tools to achieve conventional drawing, it does not need to look up tables or calculators, and can easily solve the calculation problems of complex trigonometric functions and Pythagorean theorem through drawing tools. The solution will effectively improve work and study efficiency.

Contents of the invention

The purpose of the present invention is to provide a multi-purpose protractor with simple structure, easy manufacture, low cost, multiple functions, convenient use and flexibility in order to meet the needs of the market.

The purpose of the present invention is achieved in this way, multi-purpose protractor, it is characterized in that being provided with a hollow right-angle fan-shaped main ruler and rotating auxiliary ruler, shifting auxiliary ruler, pen cap, ruler card, the inside and outside of two right-angle side plates of main ruler There are length unit engraved lines respectively, an arc-shaped guide groove is provided on the arc edge, and an angle engraved line is provided on the outer edge of the arc edge. One end is provided with a pointer, the end of the pointer is provided with a button pin, and the middle part of the rotating sub-ruler is provided with a linear guide groove with a length unit engraved line. The center line of the linear guide groove is on the same center line as the hinge and the pointer. The auxiliary ruler is provided with a length unit engraved line, and one end of the shifting auxiliary ruler and the pen cover are connected with the pointer end pin of the rotating auxiliary ruler through a button pin, and the ruler clip is clamped on a right-angle side plate of the main ruler.

The center of the button pin connecting the transfer subscale is on a straight line with the edge line provided with the length unit scale on the transfer subscale.

The widths of the two right-angled side plates are equal.

The other end of the transfer sub-ruler is sheathed in the ruler card on the right-angle side plate.

The invention has the advantages of simple structure, easy manufacture, low cost, multiple functions, convenient and flexible use. The main ruler can be used as a normal protractor, triangle ruler and ruler. The transfer sub-scale can move up and down and left and right along with the rotation of the rotary sub-scale. The scale card can be used as required. When necessary, the other end of the transfer sub-ruler is inserted into the ruler card on the right-angle side plate, which can control the transfer sub-ruler to always maintain a vertical state. The button pin has a locking function. When the rotary sub-foot rotates to a specific position, press the button pin so that the lock platform of the button pin is inserted into the arc-shaped guide groove to lock, and the pointer points out the size of its angle (the position shown in Figure 1 is 40°), a straight line corresponding to the angle passing through the center of the circle can be drawn in its linear guide groove, and the scale on the shifting sub-scale shows its sine value, the reading at the position shown in Figure 1 is 64.3mm, Then sin40°=0.643 (=64.3/100), the corresponding reading on the inner edge of the main scale is 76.5mm, that is, cos40°=0.765 (=76.5/100). Slide the transfer sub-ruler to the lower left along the guide groove of the rotating sub-ruler. When its side coincides with the reading 5 (cm) of the inner edge of the main ruler, its reading is 42mm, then its tangent value tg40°=0.84 (= 42/50), similarly, it is convenient to obtain the remaining tangent value.

The pen cover and the button pin are fixed together, and the distance between the centers of the circles is 20mm. After the pen cover coincides with the linear guide groove, insert the brush, move the button pin to the desired position and lock it, that is, you can draw a circle with the hinge as the center and the corresponding radius.

Because the right-angled sides of the rotating sub-ruler, the shifting sub-ruler with the ruler clip and the main ruler form a right-angled triangle, it can solve the problem of square sum root of any Pythagorean theorem.

If the scale card on the transfer sub-ruler is cancelled, so that the transfer sub-ruler can be rotated and moved arbitrarily, the transfer sub-ruler, the rotation sub-ruler and the main ruler can form a triangle with any angle, which can solve the problem that must be solved by using the cosine theorem. The side length and angle problems can only be solved by the trigonometric function calculation.

The rotation of the sub-ruler and the transfer of the sub-ruler can also make parallel lines in any direction.

The multi-purpose protractor can be used as a compass while being used as a common protractor, a triangle ruler and a ruler, and can solve problems related to trigonometric functions and the Pythagorean theorem, realizing the multi-purpose function and purpose of one thing.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of a button pin of the present invention;

In the figure: 1 main ruler, 2 rotating auxiliary ruler, 3 shifting auxiliary ruler, 4 arc guide groove, 5 button pin, 6 button pin, 7 pen holder, 8 linear guide groove, 9 foot clip, 10 hinge, 11 lock Taiwan, 12 pins, 13 buttons.

Detailed ways

As shown in Figure 1, the multi-purpose protractor is composed of a hollow right-angle fan-shaped main scale 1, a rotating sub-scale 2, a shifting sub-scale 3, a pen cover 7, and a ruler clip 9. The inner and outer sides of the two right-angled side plates of the main chi 1 are respectively provided with length unit engraved lines, the arc-shaped edge is provided with an arc-shaped guide groove 4, and the arc-shaped edge outer edge is provided with an angle engraved line. One end of the rotating auxiliary ruler 2 is hinged at a right angle in the main ruler 1 through a hinge 10, and the other end of the rotating auxiliary ruler 2 is provided with a pointer, and the end of the pointer is provided with a button pin 5. When the rotary sub-foot is rotated to a specific position, the button pin is pressed to insert the lock table of the button pin into the arc guide groove for locking. The middle part of rotating sub-chi 2 is provided with a linear guide groove 8 with a length unit engraved line, and the center line of the linear guide groove 8 is on the same center line as the hinge 10 and the pointer. The transfer sub-ruler 3 is provided with a length unit engraved line, one end of the transfer sub-ruler 3 and the pen cover 7 are connected with the pointer end pin of the rotating sub-ruler through the button pin 6, and the ruler clip 9 is clamped at a right angle of the main ruler 1 edge board. The center of the button pin 6 is on a straight line with the edge line that is provided with the length unit engraved line on the transfer sub-scale 3 . The widths of the two right-angle side plates of the main ruler 1 are equal. When needed, the other end of the shifting sub-ruler is slipped through the ruler card on the right-angle side plate, so that the sub-ruler 2 can be controlled to maintain a vertical state all the time. A hinge 10 and a button pin 5 are arranged at both ends of the rotating sub-ruler 2 respectively. The rotating sub-ruler 2 rotates with the hinge 10 as the center of a circle, and the button pin 5 moves along the arc-shaped guide groove 4 to ensure that the rotating sub-ruler 2 rotates smoothly. The button pin 5 locks the rotary sub-scale 2, and the rotary sub-scale 2 and the transfer sub-scale 3 can be locked by pressing the button pin 6, so as to improve work and study efficiency and quality.

Claims (4)

1. A multi-purpose protractor, which is characterized in that a hollow right-angle fan-shaped main ruler and a rotating auxiliary ruler, a shifting auxiliary ruler, a pen cover, and a ruler card are provided, and the inner and outer sides of the two right-angle side plates of the main ruler are respectively provided with length units. Engraved line, arc-shaped guide groove is set on the arc edge, angle engraved line is set on the outer edge of the arc edge, one end of the rotating auxiliary ruler is connected to the right angle inside the main ruler through a hinge, and the other end of the rotating auxiliary ruler is provided with a pointer. The end of the pointer is provided with a button pin, and the middle part of the rotating sub-ruler is provided with a linear guide groove with a length unit engraved line. The center line of the linear guide groove is on the same center line as the hinge and the pointer. The length unit is engraved, and one end of the shifting sub-scale and the pen cover are connected with the pointer end pin of the rotating sub-scale through a button pin, and the chi clip is clamped on a right-angle side plate of the main chi. 2. The multi-purpose protractor according to claim 1, characterized in that the center of the button pin connecting the transfer subscale is on a straight line with the edge line provided with the length unit scale on the transfer subscale. 3. The multi-purpose protractor according to claim 1, characterized in that the widths of the two right-angled side plates are equal. 4. The multi-purpose protractor according to claim 1, characterized in that the other end of the transfer sub-ruler is sheathed in the ruler clip on the right-angle side plate.

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