Multifunctional angulometer
A technology of protractors and right angles, applied in the field of protractors, can solve the problems of many sharp corners, high cost, large number of pieces, etc., and achieve the effects of easy manufacturing, simple structure, and convenient use
Inactive Publication Date: 2011-08-17
YANGZHOU UNIV
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Problems solved by technology
[0002] 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 sharp corners, so it is inconvenient to carry and store. At the same time, the cost is high, the tools are scattered, and it is 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 generally can only be solved by looking up tables and complex calculations
Method used
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[0017] Such as figure 1 As shown, the multi-protractor is composed of a hollow right-angle fan-shaped main ruler 1 and a rotating sub ruler 2, a transfer sub ruler 3, a pen sleeve 7, and a ruler 9 connected to each other. The inner and outer sides of the two right-angle side plates of the main ruler 1 are respectively provided with length unit engraving lines, arc guide grooves 4 are provided on the arc side, and angle engraving lines are provided on the outer edge of the arc side. One end of the rotating secondary ruler 2 is hinged at a right angle inside the main ruler 1 through a hinge 10, the other end of the rotating secondary ruler 2 is provided with a pointer, and a button pin 5 is provided at the end of the pointer. When the rotating sub-ruler rotates to a specific position, press the button pin to insert the lock table of the button pin into the arc-shaped guide groove and lock it. A linear guide groove 8 with a length unit engraved line is arranged in the middle of th...
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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
Technical field [0001] The invention relates to a protractor for learning work, in particular to the structure of a multi-protractor with the functions of a protractor, a triangle ruler, a ruler and a trigonometric function calculation function. Background technique [0002] Protractors, triangles and rulers are essential tools for students in primary, middle, and elementary schools as well as engineering and technical personnel to draw pictures. The existing tools are generally independent, with many pieces and sharp corners, which are inconvenient to carry and store. At the same time, the cost is high, the tools are scattered, and it is inconvenient to use. Trigonometric functions and the Pythagorean theorem are also knowledge that students must learn, but the calculation and memory of trigonometric functions and the Pythagorean theorem are both troublesome. Generally, it can be solved by looking up tables and complicated calculations. If there is a kind of drawing tool on the...
Claims
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IPC IPC(8): G01B3/56B43L7/10B43L13/00
Inventor 于习法易素君
Owner YANGZHOU UNIV