CN2091014U

CN2091014U - Multifunctional projection demonstrator

Info

Publication number: CN2091014U
Application number: CN 90217754
Authority: CN
Inventors: 余忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-08-07
Filing date: 1990-08-07
Publication date: 1991-12-18

Abstract

The utility model relates to a multifunctional projection demonstrator, comprising a projection box composed of three movable projection faces v, h, w, projection transformation plate v 1 (h) 1, a triangular plate providing with an opened slot, a rectangular plate and a circular plate which are provided with center holes, a supporting seat composed of a base, a connecting rod, point or line and a bracket composed of a base and an inserted rod. The utility model overcomes the problems that the process of teaching the descriptive geometry of the science and engineering course schools is nonobjective in briefing, cockamamie in demonstration and intricate in property existing in the prior art. The utility model has the advantages of convenient demonstration for teachers, easy comprehension and accept for students, capable demonstration of the projection and the projection transformation of various positions of points, lines and surfaces, etc. and is a necessary teaching aid for science and engineering course schools.

Description

Multifunctional projection demonstrator

The utility model relates to a kind of multi-functional projection demonstration tool that can demonstrate point, line, surface all places and crossing projection and projective transformation, belongs to teaching aid.

At present, each science and engineering universities and colleges gives lessons " descriptive geometry " as an emphasis, in order to have taught this more abstract point, line, face all places and crossing projection and projective transformation, each state has all used a large amount of wall charts, the cost height, demonstrate but not directly perceived, operation also bothers, part universities and colleges have made the projection case according to the projection theory of first quartile, it is more directly perceived to utilize the projection case to explain projection, but also have following shortcoming: (one) can only presentation site, line, the projection of face, parallel as for line and line, intersect, intersect, vertically, line and face intersects, intersecting of face and face, parallel, projective transformations etc. can't be demonstrated; (2) explain in the time of can only being assembled into the state at first quartile angle, can not show the position of point, line, surface on the projecting plane after the expansion.

The utility model aims to provide a kind of teacher's of being convenient to demonstration, is easy to the multi-functional projection demonstration tool that the student understands acceptance, demonstrating visual.

Solution of the present utility model is: on V, the H of the projection case that is made of three movable projecting plane V, H, W, the W face even graticule is set; Be provided with V ₁(H ₁) projective transformation plate, the set square with fluting, the rectangular slab with center pit and circular slab; Be provided with the bearing that constitutes by base, connecting rod, point or line, hinged between the connecting rod, four degree of freedom in all around, space of energy guarantee point or line; Be provided with the support that is made of base, inserted link, base is provided with jack, and with the movable assembling of inserted link, inserted link is provided with locating slot.

Below in conjunction with embodiment and accompanying drawing thereof the utility model is elaborated.

Fig. 1 is projection case and projective transformation plate V ₁(H ₁) topology view;

Fig. 2 is the topology view of set square, rectangular slab, circular slab;

Fig. 3 is the topology view of bearing, support;

Fig. 4 is that the face face intersects (a), the line face intersects (b), changes three projection exemplary view of face method (c).

The utility model is based on a projection case, the projection case is made of three extensible movable projecting plane V, H, W, be provided with even graticule in V, H, three faces of W, And about the graticule, about put on 1,5,10 ... the arabic numeral of 35 grades are provided with simultaneously: V ₁(H ₁) the projective transformation plate, V ₁, H ₁Be marked on respectively on the converter plate dihedral; Isoceles triangle plate, right angle triangle with fluting (1), the rectangular slab of band center pit (2), fluting (3), the circular slab of band center pit (4), fluting (1) becomes 35 ° of angles with the base of isoceles triangle plate, and fluting (1) becomes 35 ° or 55 ° of angles with the right-angle side of right angle triangle; By the bearing that base (5), connecting rod (6), (7), (8) point (9) or line (10) constitute, hinged between the connecting rod, four degree of freedom in all around, space of energy guarantee point (9) or line (10); Support by base (11), inserted link (12) formation, base (11) is provided with jack (13), with the movable assembling of inserted link (12), inserted link (12) is provided with locating slot (14), locating slot (14) has four, be located at inserted link (12) two ends respectively, be respectively 90 °, 60 °, 45 ° and 30 ° with the angle of inserted link (12) end face, the two ends of inserted link (12) all can match with the jack (13) of base (11).

By above-mentioned member, can systematically demonstrate point, line, surface all places and crossing projection and projective transformation, rectangular slab and circular slab can be demonstrated face or the crossing projection of line face, but the projection of bearing presentation site or line, set square, projective transformation plate, support can be demonstrated projection, the conversion of face, and accompanying drawing 4 has provided face face crossing (a), line face crossing (b) and changed three projection exemplary view of face method (c).

The utility model is by a small amount of member, comparison system, demonstrate the projection and the conversion of point, line, surface intuitively, make the student can understand the projection and the projective transformation of all places of space point, line, surface more abstract, hard to understand intuitively, reduced teacher's workload, having saved education funds, is the indispensable teaching aid of science and engineering universities and colleges.

Claims

1, a kind of multi-functional projection demonstration tool with the projection case that constitutes by three movable projecting plane V, H, W, feature of the present utility model is:

A:V, H, W face are provided with even graticule;

B: be provided with V ₁(H ₁) the projective transformation plate, have the set square of fluting (1), have the rectangular slab of center pit (2), have the circular slab of center pit (4);

C: be provided with the bearing that constitutes by base (5), connecting rod (6), (7), (8), point (9) or line (10), hinged between the connecting rod, four degree of freedom in all around, space of energy guarantee point (9) or line (10);

D: be provided with the support that is made of base (11), inserted link (12), base (11) is provided with jack (13), and with the movable assembling of inserted link (12), inserted link (12) is provided with locating slot (14).

2, multi-functional projection demonstration tool according to claim 1, it is characterized in that described set square be isosceles or the right angle, fluting (1) is 35 ° with the base angle of isoceles triangle plate, and fluting (1) is 35 ° or 55 ° with the right-angle side angle of right angle triangle.

3, multi-functional projection demonstration tool according to claim 1 is characterized in that described rectangular slab is provided with fluting (3).

4, multi-functional projection demonstration tool according to claim 1 is characterized in that described inserted link (12) locating slot (14) and the angle of inserted link (12) end face are 90 ° or 60 ° or 45 ° or 30 °.