CN2175117Y

CN2175117Y - Ruler with function for calculating angles and sides of triangle

Info

Publication number: CN2175117Y
Application number: CN 93227431
Authority: CN
Inventors: 薛庆军
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-01
Filing date: 1993-03-01
Publication date: 1994-08-24
Anticipated expiration: 2003-03-01

Abstract

The utility model discloses a calculating ruler for the angles and the sides of a triangle. The utility model is used for calculating and teaching. The utility model is characterized in that the calculating ruler is composed of a main ruler 1, a turn ruler 2, a movable turn ruler 3, a movable protractor 4, etc. Because the length of the three sides of a triangle which is composed of the main ruler 1, a turn ruler 3, and a movable turn ruler 4 can be changed freely, any triangle can be formed. Therefore, in the calculation of a triangle, the shape of the triangle can be determined according to the known sides and the angles, and the sides and the angles which are required to calculate can be read by the rulers and the protractor directly. Besides, because any triangle can be formed freely, a triangle with any angle can be drawn proportionally and accurately on the blackboard to offer the help when a teacher has a class.

Description

Ruler with function for calculating angles and sides of triangle

The utility model relates to a kind of triangle corner slide ruler of calculating and imparting knowledge to students of being used to.

Calculate three usefulness shape corners is one of the problem of common (especially in teaching), at present, addresses this problem, and mainly calculates by looking into mathematic(al) table, and like this, promptly trouble is not directly perceived again, is easy to occur mistake; In addition, during the teacher taught, when drawing triangle on blackboard, free-hand mostly figure or the fixing set square of utilization done like this, often caused figure inaccurate, thereby influences quality of instruction.

Task of the present utility model, be to provide a kind of triangle corner slide ruler, utilize it, people can carry out the triangle corner accurately, intuitively, rapidly and calculate, teacher's various triangles that also can draw in proportion accurately on blackboard help improving the quality of teaching.

The utility model be achieved in that it by main scale 1, change chi 2, move change chi 3, amount of movement hornwork 4, fixed rotating shaft 5(1), 5(2), 5(3) form.Its structure and number of assembling steps are as follows: the protractor centre bore on the main scale 1 is aligned with changeing the little circular centre hole of chi 2 bottom righthand sides, go into fixed rotating shaft 5(1 on again in two holes); The little circular centre hole and amount of movement hornwork 4 centre bores that move to change chi 3 lower-left ends are aligned, go into fixed rotating shaft 5(2 on again in two holes); Chute on the amount of movement hornwork 4 is inserted main scale 1 ruler end, and rotation changes chi 2, move and change chi 3, the two intersected, again with fixed rotating shaft 5(3) in the intersection point place chute of packing into i.e. assembling finish.During use, owing to change chi 2 and move commentaries on classics chi 3 all rotatable, and amount of movement hornwork 4 can make the mobile chi 3 that changes move on main scale 1, like this, by main scale 1, change chi 2, moving changes the triangle that chi 3 is formed, three limits can change arbitrarily, can form arbitrary triangle, therefore, in triangle calculates, just can be by known limit, the angle, determine triangular shaped, and the very fast scale that passes through on chi and the protractor, read the triangle corner numerical value of being asked, in addition, because it can form arbitrary triangle, also can be the teacher and on blackboard, draw arbitrary triangle in proportion in teaching and offer help.

The utility model is simple in structure, is skillfully constructed, and makes easily, utilize it, can carry out the triangle corner rapidly accurately and calculate, also can be as the drawing instrument of drawing arbitrary triangle, help the teacher on the blackboard or the drawing personnel on drawing, draw the triangle at any angle.

Accompanying drawing 1 is the utility model agent structure schematic diagram.

Accompanying drawing 2 is the utility model A-A face cutaway view.

Accompanying drawing 3 is the utility model B-B face cutaway view.

Below in conjunction with accompanying drawing enforcement of the present utility model is further described.

Main scale 1 of the present utility model is the graduated ruler that a left end has a diameter phi 70mm semicircular protractor, and the partly long 220mm of ruler, wide 15mm, thick 2mm, semicircular protractor and its diameter have a φ 5mm centre bore with wide, high 60mm, center; Change chi 2 long 180mm, wide 10mm, thick 2mm, have scale, centre that the open slot of one wide 3mm, long 16mm is arranged on the chi, the chi bottom righthand side is round shape, diameter phi 12mm, and the center is a diameter phi 5mm circular hole, the scale face of circular hole center and chi is point-blank; Moving changes chi 3 long 180mm, wide 10mm, thick 2mm, has scale, centre that the open slot of one wide 3mm, long 16mm is arranged on the chi, and chi lower-left end is round shape, diameter phi 12mm, and the center is a diameter phi 5mm circular hole, the scale face of circular hole center and chi is point-blank; Amount of movement hornwork 4 tops are that semicircular protractor, the bottom of a diameter phi 70mm has chute, a center that matches with main scale 1 ruler section that one φ 5mm centre bore is arranged, its wide for 70mm, be up to 60mm; Fixed rotating shaft 5(1), 5(2), 5(3) be rivet-like, 5(1), 5(2) in the middle of the minimum diameter phi 5mm of place, 5(3) in the middle of the minimum diameter phi 3mm of place; The material of above material can be plastics, lucite, aluminium alloy and stainless steel etc.

Claims

1, a kind of triangle corner slide ruler of calculating and imparting knowledge to students of being used to, it is characterized in that it is by main scale 1, change chi 2, moving changes chi 3, amount of movement hornwork 4, fixed rotating shaft 5 (1), 5 (2), 5 (3) form, chute on the amount of movement hornwork 4 is enclosed within the ruler section of main scale 1, change chi 2 bottom righthand side center holes and main scale 1 left end protractor center hole centering and be fixed together by fixed rotating shaft 5 (1), move to change chi 3 lower-left end center holes and be fixed together with the protractor center hole centering of amount of movement hornwork 4 and by fixed rotating shaft 5 (2), the intersection point that changes chi 2 and move commentaries on classics chi 3 being fixed together by fixed rotating shaft 5 (3).

2, according to claims 1 described a kind of triangle corner slide ruler, it is characterized in that: main scale 1 is that a left end top is connected with a semicircle protractor and indicates the ruler of scale.

3, according to claims 1 described a kind of triangle corner slide ruler, it is characterized in that: change chi 2 and move commentaries on classics chi 3 being the ruler shape, scale is arranged on the chi, one section open slot is arranged in the middle of the chi.

4, according to claims 1 described a kind of triangle corner slide ruler, it is characterized in that: amount of movement hornwork 4 tops are a semicircle protractor, the bottom is the rectangle that length and protractor diameter are equal to, and a chute that matches with main scale 1 ruler section is arranged in the middle of the rectangle.