CN2357928Y

CN2357928Y - Multifunctional teaching triangle

Info

Publication number: CN2357928Y
Application number: CN 98249933
Authority: CN
Inventors: 袁治海; 王菊花
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-18
Filing date: 1998-12-18
Publication date: 2000-01-12
Anticipated expiration: 2008-12-18

Abstract

The utility model relates to a multifunctional teaching set square. Both ends of a main ruler (1) are hinged with concave slide rulers (2) and (8) by connecting angle iron (7), dovetail grooves are arranged on the concave slide rulers, a rotating shaft (5) is hinged with convex slide rulers (3) and (6), dovetail slide blocks are arranged on the convex slide rulers, and the dovetail slide blocks and the dovetail grooves are mutually matched to compose a set square. Linear scales are arranged on the main ruler (1), angle marking lines are arranged on the convex slide rulers and the concave slide rulers, compass heads (13) and (16) are arranged in a groove of the main ruler (1), and the compass head are matched with the convex slide rulers (3) and (6) after taken out to compose a pair of compasses. The utility model has the advantages of quick angle measurement, drawing time saving, drawing accuracy reinforcement and convenient carryover. The utility model is in the shape of bar ruler after folded and is suitable for classroom teaching.

Description

The multifunction teaching set square

The utility model relates to set square, particularly a kind of multifunction teaching set square that can change angle.

The teaching aid of teaching usefulness is single in the prior art, and number of packages is many, and teacher carries inconvenience on class, when primary school uses semicircular protractor to teach students the picture angle and during tolerance, unusual trouble, existing teaching set square can not angle changing, can not give the multiple geometric figure of student's ocular demonstration.

The purpose of this utility model is: it is the combination teaching instrument of one that a kind of ruler, set square, protractor, compasses of collecting is provided, and has picture angle, tolerance angle, the triangle of drawing different shape and leg-of-mutton constitutional diagram, draws multiple function such as circle.

Formation of the present utility model: form by main scale, protruding slide rule, recessed slide rule and compasses head, main scale (1) two ends are by connecting angle bar (7) hinged recessed slide rules (2) (8), the hinged protruding slide rule of rotating shaft (5) (3) (6), dovetail slide block (4) on the protruding slide rule (3) is inserted in the dovetail groove (11) of recessed slide rule (2), dovetail slide block (10) on the protruding slide rule (6) inserts in the dovetail groove (9) on the recessed slide rule (8), form set square, in the back groove of main scale (1), place two compasses heads (13) (16), and link together by connecting rod (15); Protruding slide rule (3) (6) after recessed slide rule (2) (8) taking-up, is loaded onto compasses head (13) (16) respectively, form compasses.Main scale (1) has the ruler graduation mark on the front, and is fluted on the back side, and one of groove has the nail hole, and there is the projection that inserts in the compasses head clamp port (18) other end.Dovetail groove (14) is arranged on the compasses head (13) (16), and the head of compasses head (16) has circular arc clamp port (18).Corresponding angle line is arranged on protruding slide rule and recessed slide rule.

Compared with the prior art, the utility model tolerance angle is rapid, saves the mapping time, strengthens the mapping accuracy, can make compasses and use after assembling, is the bar rule shape after the gathering, and is easy to carry.

Accompanying drawing 1 is the utility model front view;

Accompanying drawing 2 is rearviews of accompanying drawing 1;

Accompanying drawing 3 is compasses constitutional diagrams.

Embodiment of the present utility model: as accompanying drawing 1, shown in the accompanying drawing 2, at the two ends of main scale (1) by connecting angle bar (7) hinged recessed slide rules (2) (8), protruding slide rule (3) (6) is hinged by rotating shaft (5), dovetail groove (11) is arranged on recessed slide rule (2), dovetail groove (9) is arranged on recessed slide rule (8), dovetail slide block (4) is arranged on protruding slide rule (3), dovetail slide block (10) is arranged on protruding slide rule (6), dovetail slide block (4) on the protruding slide rule (3) is inserted in the dovetail groove (11) of recessed slide rule (2), dovetail slide block (10) on the protruding slide rule (6) is inserted in the dovetail groove (9) of recessed slide rule (8), form set square.In the groove of main scale (1) back, place compasses head (13) (16), dovetail groove (14) is arranged on compasses head (13) (16), in the dovetail groove of compasses head (13), put connecting rod (15), during placement earlier in the top patchhole with compasses head (13), clamp port (18) with compasses head (16) is stuck on the boss of main scale (1) again, again connecting rod (15) is shifted onto between two compasses heads, be fixed.

On main scale (1), the ruler scale is arranged, on protruding slide rule (3) (6) and recessed slide rule (2) (8), the angle groove is arranged.

As shown in Figure 3: compasses head (13) (16) is inserted in protruding slide rule (3) (6) respectively goes up the composition compasses.

During the tolerance angle, only need main scale (1) and protruding slide rule (6) are opened, the number of degrees of institute's angle have tangible scale to represent on protruding slide rule (3).

Mapping is convenient, as draws two congruent triangles, with the triangle of the utility model furnishing required form, draws a Δ ABC with inner elder generation, moves a position, draws Δ A ' B ' C ' again and gets final product.

Utilize the utility model mapping accurately, equal 15 ° as the base angle of isosceles triangle, waist is 2a, asks the height on the waist.It is 15 ° triangle that the utility model is transferred an angle, at this moment can draw more exactly and satisfy the triangle of the meaning of the question.

The utility model can be made compasses and use, and the time spent can not be assembled in two compasses heads in the main scale, leg-of-mutton both sides is drawn in be the bar rule shape, portably uses conveniently.

Claims

1, a kind of multifunction teaching set square, form by main scale, protruding slide rule, recessed slide rule and compasses head, it is characterized in that: main scale (1) two ends are by connecting angle bar (7) hinged recessed slide rules (2) (8), the hinged protruding slide rule of rotating shaft (5) (3) (6), dovetail slide block (4) on the protruding slide rule (3) is inserted in the dovetail groove (11) of recessed slide rule (2), dovetail slide block (10) on the protruding slide rule (6) inserts in the dovetail groove (9) on the recessed slide rule (8), form set square, in the back groove of main scale (1), place two compasses heads (13) (16), and link together by connecting rod (15); Protruding slide rule (3) (6) after recessed slide rule (2) (8) taking-up, is loaded onto compasses head (13) (16) respectively, form compasses.

2, multifunction teaching set square according to claim 1 is characterized in that: main scale (1) has the ruler graduation mark on the front, and is fluted on the back side, and one of groove has the nail hole, and there is the projection that inserts in the compasses head clamp port (18) other end.

3, multifunction teaching set square according to claim 1 is characterized in that: dovetail groove (14) is arranged on the compasses head (13) (16), and the head of compasses head (16) has circular arc clamp port (18).

4, multifunction teaching set square according to claim 1 is characterized in that: corresponding angle line is arranged on protruding slide rule and recessed slide rule.