CN2094777U

CN2094777U - Point line plane projection demonstration teaching aid

Info

Publication number: CN2094777U
Application number: CN 91209900
Authority: CN
Inventors: 庄胜
Original assignee: SHENGLI TEACHING AID FACTORY W
Current assignee: SHENGLI TEACHING AID FACTORY W
Priority date: 1991-06-11
Filing date: 1991-06-11
Publication date: 1992-01-29

Abstract

The utility model discloses a points, lines and planes projection demonstration teaching aid, belonging to the teaching aid of the descriptive geometry. The projection demonstration teaching aid comprises a projection box composed of three projection planes W, H and V. The inner surface is provided with a sheet iron layer and simultaneous is provided with a supporting seat and small spheres for delegating points. Two ends of a rod are provided with wires formed by small spheres. Three terminal points of a T-shaped rod rack are provided with planes formed by small spheres. The supporting seat comprises a magnetic ring and a telescopic rod which are matched with points, wires and planes to be put in the projection box. The utility model can demonstrate projections of points, wires and planes in optional angles and positions. The utility model is simple in structure, low in cost, convenient in operation and visual in demonstration and is an ideal teaching aid of the descriptive geometry.

Description

Point line plane projection demonstration teaching aid

The utility model belongs to the descriptive geometry teaching aid, is a kind of point, line, surface projection demonstration tool.

Universities especially generally adopt the cage steel wire rack to the demonstration explanation that point, line, surface projection and line line are intersected, the line face intersects, the face face intersects projection in the middle school descriptive geometry course at present,, steel wire rack is set as can be shelved the point, line, surface that are projected demonstration and intersect two wires, line face, face face.System demonstrates much steel wire racks of projection relation all sidedly, and cost height, operation of teacher also quite bother, and this steel wire rack complex structure, and demonstration is got up not directly perceived, and when particularly demonstrating the projection angle variation, the student accepts than indigestibility.

The purpose of this utility model provide a kind of simple in structure, cost is low, the point, line, surface projection of easy to operate, demonstrating visual demonstration tool.

The utility model is that three projecting plane W, H at the projection case, the inside surface of V are provided with the iron sheet layer, set the little ball of bearing, representative point simultaneously, respectively establish the line of roundlet ball formation at the two ends of bar, respectively establish the face of roundlet ball formation at three end points of T shape bridge, rest base is a magnet ring, be provided with steel ball in the magnet ring, the fixedly connected telescopic lever of steel ball.But little ball is put projection in telescopic lever top presentation site; Line is put the projection that to demonstrate line on the telescopic lever top; Face is put the projection of the face of can demonstrating on the telescopic lever top.

Providing embodiment below in conjunction with accompanying drawing makes the utility model and further specifying.

Fig. 1 is the topology view of present embodiment projection case;

Fig. 2 is the assembly structure view of the utility model bearing and point, line, surface.

Present embodiment is provided with a projection case that is made of W, H, three projecting planes of V, and the inside surface of W, H, V is provided with iron sheet layer (1), and skin can adopt three-ply board to make, simultaneously on inside surface is retouched graticule so that determine the projection coordinate position.Present embodiment also sets the little ball of bearing, representative point, respectively establishes the line of roundlet ball formation at the two ends of bar, respectively establishes the face that the roundlet ball constitutes at three end points of T shape bridge, rest base is magnet ring (2), be provided with steel ball (3) in the magnet ring (2), the fixedly connected telescopic lever of steel ball (3) (4), telescopic lever (4) top is provided with endoporus, but little ball, constitute on the bar of line, constitute the bearing pin (5) that is equipped with close-fitting pull bar top endoporus on the T shape bridge of face, represent the horizon bar of the T shape bridge of face can rotate relative to vertical bar.

The bearing pin of point (little ball), line, face is assemblied in the top endoporus of telescopic lever, bearing places in the projection case, bearing holds projection case baseplane by magnet ring, pull bar can be done arbitrarily towards adjusting by the activity of steel ball in magnet ring, and horizon bar the rotating of passing through T shape bridge relative to vertical bar, can projection arbitrarily angled to point, line, surface, the optional position demonstrate, can also reach best projection demonstration effect by mobile support saddle in case of necessity.

If will demonstrate line line, line face, crossing projection and the projection of point, line, surface relative position relation of face face, can adopt a plurality of bearings to finish.

As seen this practical from above-mentioned, simple in structure, cost is low, easy to operate, demonstrating visual, is a kind of desirable descriptive geometry teaching aid.

Claims

1, a kind of point, line, surface projection demonstration tool with projection case, the projection case is made of W, H, three projecting planes of V, it is characterized in that the inside surface of W, H, V is provided with iron sheet layer (1); Set the little ball of bearing, representative point simultaneously, respectively establish the line that the roundlet ball constitutes at the two ends of bar, respectively establish the face that the roundlet ball constitutes at three end points of T shape bridge, rest base is magnet ring (2), be provided with steel ball (3), the fixedly connected telescopic lever of steel ball (3) (4) in the magnet ring (2), little ball, line, face all can be put on telescopic lever (4) top.

2, point, line, surface projection demonstration tool according to claim 1, it is characterized in that telescopic lever (4) top is provided with endoporus, but be equipped with the bearing pin (5) of close-fitting endoporus on little ball, line, the face, represent the horizon bar of the T shape bridge of face can rotate relative to vertical bar.