A drawing ruler for geography
A drawing ruler and subject technology, applied in the field of geography, can solve the problems that the ruler cannot meet the requirements and the drawing ruler is inconvenient to carry
Active Publication Date: 2020-07-07
河北省科学院地理科学研究所
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Problems solved by technology
[0003] The subject of geography is mainly to teach knowledge about geography, and when teaching geography, it is usually necessary to use a drawing ruler to draw, so as to explain the knowledge of geography more vividly, and when drawing, it is necessary to draw Straight lines and circles, and sometimes the straight lines or circles to be drawn are large, ordinary rulers cannot meet the requirements, and too long drawing rulers are inconvenient to carry
Method used
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[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only some embodiments of the present invention; rather than all embodiments. Based on the embodiments of the present invention; all other embodiments obtained by persons of ordinary skill in the art without creative work; all belong to the protection scope of the present invention.
[0030] see Figure 1-7 , a kind of drawing ruler for geography, comprising a first structure and a second structure 1, the first structure comprises an upper structure 2, a lower structure 3 and a fixed block 4, a side of the fixed block 4 and the upper structure 2 and a part of the lower structure 3 Side sliding connection;
[0031] The upper surface of the second structure 1 is provided with an upper slideway 5, and the lower surface is provided...
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The invention discloses a drawing ruler for a geographic subject. The drawing ruler for the geographic subject comprises a first structure and a second structure. The first structure comprises an upper structure, a lower structure and a fixing block, wherein the lateral side of the fixing block is in sliding connection with one side of the upper structure and one side of the lower structure. The second structure is pulled out from the upper structure and the lower structure so as to be capable of being extended. After the second structure is extended, a driven piston is driven by a driving piston to move, so that an air bag ball is inserted into a ball cavity of the upper structure and a ball cavity of the lower structure for fixing. When a circle needs to be drawn, a threaded column and a threaded hole are fixed by rotating a clamping device, and meanwhile, an elliptical disc pushes fixing rods in fixing devices on the upper side and lower side to be inserted into a limiting hole, so that the distance between the clamping device and a rotating device is fixed; and then circle drawing can be performed by taking the rotating device as a circle.
Description
technical field [0001] The invention relates to the field of geography, in particular to a drawing ruler for geography. Background technique [0002] Geography is a subject about the relationship between people living on the earth and their geographical environment. Generally speaking, the scope of geography includes various environments in which human beings live, that is, the natural environment and the human environment. The natural environment includes Atmosphere, hydrosphere, lithosphere, biosphere, pedosphere and other spheres, from which there are various branches of geography, such as climate phenomena, hydrological phenomena and water environment, natural resources on the earth, landforms, distribution of organisms and ecology Phenomena, soil distribution and types, and many other phenomena. In addition to these, physical geographical phenomena also focus on surface system phenomena due to the interaction of patterns, hydrology, plants, and soils, as well as various...
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IPC IPC(8): B43L13/00B43L9/00
CPCB43L9/00B43L13/00
Inventor 张丽云乔良徐宁邸明慧张伟
Owner 河北省科学院地理科学研究所