CN2668409Y - Combined ruler - Google Patents

Abstract

The utility model relates to a combined ruler which belongs to the field of teaching aid for plane geometry. The utility model can conveniently demonstrate triangles and quadrangles. The utility model is mainly composed of four rulers and four screw bolts. Every ruler is provided with a long slotted hole in the position of a longitudinal axial cord. The heads and the tails of the four rulers are overlapped in turn and are connected with each other by the screw bolts passing through the long slotted holes. The utility model has the advantages of simple structure, portability and visual teaching effect, and can well develop middle-school students' associative ability. The utility model can be widely used in the teaching activities of plane geometry in junior high schools.

Description

The combined type ruler

One, technical field

The utility model relates to geometry teaching apparatus field, the especially a kind of combined type four bar chis that can demonstrate multiple planar graph.

Two, background technology

In the teaching of junior middle school's plane geometry, triangle and quadrangle are beginner's main contents.At present, in teaching, the academics and students mainly uses set square to be figure, uses set square, and the one, carry inconvenience, the 2nd, do the figure trouble, the 3rd, explain also not intuitively, influenced the quality of quality-oriented education.

Three, utility model content

At the deficiency that prior art exists, the utility model provides a kind of combined type ruler, and it can not only demonstrate multiple figure and easy to carry.

The technical scheme in the invention for solving the technical problem is: the combined type ruler mainly is made up of four rulers and four bolts, a long slot bore is all established in the longitudinal axis position of every ruler, head and the tail are overlapping successively for four rulers, pass long slot bore by bolt and connect.The nut of described bolt is the flattened cylindrical body, and the periphery of nut is vertical line shape.

Good effect of the present utility model is: because tetragonal unstability, bolt vertically moves along long slot bore, four ruler triangularities capable of being combined and quadrangle, use this combined type four bar rulers, convenient and intuitive, middle school student's associative ability can not only be developed preferably, teachers and students' mental labour intensity can also be alleviated.

Four, description of drawings

Below in conjunction with drawings and Examples utility model is described further.

Accompanying drawing is the utility model structural representation.

Ruler in the drawings, 1; 2, long slot bore; 3, bolt; 4, nut.

Five, the specific embodiment

In the accompanying drawings, four rulers 1, head and the tail are overlapping successively all to establish 2, four rulers 1 of a long slot bore at its longitudinal axis, pass long slot bore 2 by bolt 3 and connect.The nut 4 of bolt 3 is the flattened cylindrical body, and nut 4 peripheries are vertical line shape.

Claims (2)

1, a kind of combined type ruler, it comprises four rulers (1) and four bolts (3) etc., it is characterized in that: a long slot bore (2) is all established in the longitudinal axis position of every ruler (1), and four rulers (1) head and the tail successively are overlapping, passes long slot bore (2) by bolt (3) and connects.

2, a kind of combined type ruler according to claim 1 is characterized in that: the nut (4) of described bolt (3) is the flattened cylindrical body, and its periphery is vertical line shape.

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