Surveying and mapping ruler

Abstract

The utility model discloses a surveying and mapping ruler, and belongs to the technical field of measuring tools. The circle drawing ruler comprises a ruler body and a circle drawing plate which is installed in a sliding groove formed in the ruler body in the length direction and connected with the sliding groove in a sliding mode. The top end of the circle drawing plate is provided with a pressing cap used for enabling the circle drawing plate to be fixedly connected with any position of the ruler body, and the circle drawing plate is provided with at least one circle drawing through hole through which a pen point can pass. A cone part is formed at the lower part of the aim point, and a core hole for mounting the aim point and enabling the cone part to protrude out of the surface of the ruler body to be in contact with the paper surface is formed in the end part, located in the sliding groove, of the ruler body; the depth of the auxiliary core hole is larger than that of the core hole, and the auxiliary core hole is used for installing the aim point and enabling the cone part to be far away from the paper surface. According to the surveying and mapping ruler, the aim point and the circle drawing plate are accurately and reliably positioned, a circle or an arc can be accurately drawn under the condition that compasses are not carried, the use function of the surveying and mapping ruler is expanded, the structure is simple, and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, in particular to a surveying ruler. Background Art

[0002] Surveying and mapping refers to the measurement, collection and mapping of the shape, size, spatial location and attributes of natural geographical features or artificial facilities on the surface;

[0003] With the development of science and technology, commonly used surveying and mapping instruments include 3D laser scanners, levels, theodolites, total stations, GPS receivers, GPS handhelds, super stations, gyroscopes, planimeter, steel rulers, stopwatches, etc. Although surveying and mapping are assisted by many of the above equipment, drawing drawings on drawings still requires tools such as straight lines, rulers for measuring, compasses for drawing circles or arcs, and pens. Pens, rulers, and compasses each perform their duties and have single functions. Moreover, they are small in size and easy to forget, lose, or miss.

[0004] In the prior art, there is also a corresponding multifunctional ruler, which has several through holes along the edge of the scale line on the ruler body. When in use, one end of the ruler body is pressed and the pen tip passes through any through hole to draw a circle or arc. Although the structure is simple, it takes into account the functions of drawing and arcing, and is easy to use, but there are still disadvantages when using it. The center end of the circle is unstable when drawing a circle, resulting in drawing failure. In addition, there is a distance between the through holes for drawing a circle, so it is impossible to draw a circle or arc with any diameter. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a surveying ruler for solving the problems in the prior art that the ruler with both arc drawing and arc function cannot draw circles with arbitrary diameters and has low accuracy when drawing.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] The utility model discloses a surveying ruler, comprising:

[0008] A ruler body, and a drawing circular plate installed in a slide groove provided along the length of the ruler body and slidably connected to the slide groove;

[0009] The top of the circular drawing plate is provided with a pressure cap for fixedly connecting it to any position of the ruler body, and the circular drawing plate is provided with at least one circular drawing hole through which a pen tip can pass; and

[0010] A centering pin for locating the center of a circle, with a tapered portion formed at its lower portion, and a core hole for mounting the centering pin at the end of the slide groove so as to allow the tapered portion to protrude from the surface of the ruler body and contact the paper surface; and

[0011] A secondary core hole with a depth greater than that of the core hole is provided on the ruler body and is used for installing the alignment center and keeping the cone away from the paper surface.

[0012] Furthermore, a flange is formed on the edge of the drawing circular plate for sliding connection with the sliding groove of the T-shaped structure, and a connecting column is fixedly connected to the upper surface of the drawing circular plate. The connecting column is threadedly connected to the pressure cap, and the connecting column is located at the lower part of the pressure cap and is fitted with a pressure plate.

[0013] Furthermore, the circular drawing plate is provided with a plurality of circular drawing through holes of different diameters at intervals, and centering lines are provided on both sides of the circular drawing through holes on the circular drawing plate.

[0014] Furthermore, the circular through holes are symmetrically provided on both sides of the circular drawing plate.

[0015] Furthermore, the alignment center includes a circular core column with magnetic structure for cooperating with the core hole, the top end of the core column is fixedly connected to a handle portion larger than its diameter, and the bottom end of the core column is formed with the cone portion.

[0016] Furthermore, a functional area is arranged on the upper surface of the ruler.

[0017] Furthermore, the functional area includes a first straight line area, a second straight line area, a protractor area, a circle drawing area, and a polygon drawing area;

[0018] The first straight area, the second straight area, the protractor area, the circle drawing area, and the polygon drawing area are arranged around the periphery of the sliding groove.

[0019] In the above technical solution, the utility model provides a surveying ruler with the following beneficial effects:

[0020] The surveying ruler designed by the present invention is compared with the prior art. The drawing circular plate slidably connected to the ruler body is provided with a circular through hole. The pen tip can contact the paper surface at the lower part of the ruler body through the circular through hole to draw lines. The core hole and the auxiliary core hole provided on the ruler body are installed with a crosshair. The ruler body is provided with a core hole at the end of the slide groove. The crosshair can be selectively installed in the core hole or the auxiliary core hole. A cone is formed at the lower part of the crosshair. When the crosshair is matched with the core hole, the crosshair is pressed, and the cone directly contacts and positions the paper surface, pushing the ruler body. The ruler body can rotate around the crosshair to accurately draw a circle or an arc. When the crosshair is matched with the auxiliary core hole, the cone is away from the paper surface to avoid damaging the crosshair and at the same time avoid the crosshair cone from affecting the normal use of the ruler body. The crosshair and the drawing circular plate of the surveying ruler are accurately and reliably positioned, so that circles or arcs can be accurately drawn without carrying a compass, thereby expanding the use function of the surveying ruler. The structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 This is a main view of a surveying ruler disclosed in the utility model;

[0023] Figure 2 This is a rear view of a surveying ruler disclosed in the utility model;

[0024] Figure 3 It is a partial enlarged view of a surveying ruler disclosed in the utility model;

[0025] Figure 4 This utility model discloses an axonometric drawing of a circular plate for surveying and mapping;

[0026] Figure 5 This is an exploded view of a surveying and mapping circular plate disclosed in the utility model;

[0027] Figure 6 This utility model discloses an axonometric drawing of a surveying ruler center;

[0028] Figure 7 This is a main view of a surveying ruler collimator disclosed in the utility model;

[0029] Figure 8 This is a front view of another embodiment of a surveying and mapping circular plate disclosed in the utility model.

[0030] Description of reference numerals:

[0031] 1. Ruler; 2. Circular drawing board; 3. Crosshair; 4. First straight line area; 5. Second straight line area; 6. Protractor area; 7. Circular drawing area; 8. Polygon drawing area;

[0032] 11. Slide groove; 12. Core hole; 13. Auxiliary core hole;

[0033] 21. Connecting column; 22. Draw round through hole; 23. Pressing plate; 24. Pressing cap;

[0034] 31. Cone; 32. Handle. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 、 2 As shown;

[0037] The utility model discloses a surveying ruler, comprising:

[0038] The ruler body 1 is a steel plate ruler. One side of the ruler body 1 is formed with a straight line segment. Of course, it can also have straight line segments on both sides. This embodiment only uses the ruler body 1 as an example of a special-shaped structure. A sliding groove 11 is opened in the middle of the ruler body 1 along the length direction. The drawing circular plate 2 is slidably connected in the sliding groove 11.

[0039] A pressure cap 24 is installed at the top of the drawing circular plate 2. When in use, the pressure cap 24 squeezes the ruler body 1 and the drawing circular plate 2, thereby achieving a fixed connection between the drawing circular plate 2 and the ruler body 1 at any position in the chute 11, thereby positioning the drawing circular plate 2. At least one drawing circular hole 22 is opened on one side of the drawing circular plate 2 for the pen tip to pass through. The pen tip can contact the paper surface below the ruler body 1 through the drawing circular hole 22 to draw a line. The ruler body 1 is provided with scale lines on the side of the chute 11. The radius of the circle is determined by the correspondence between the scale lines and the drawing circular hole 22.

[0040] The center 3 is used to locate the center of a circle. A cone 31 is formed at the lower part of the center 3. The ruler body 1 is provided with a core hole 12 at the end of the slide groove 11. The core hole 12 is transitionally matched with the center 3. The center 3 is installed in the core hole 12. The cone 31 of the center 3 protrudes from the lower surface of the ruler body 1 and contacts the paper surface. When in use, the center 3 is pressed, and the cone 31 of the center 3 directly contacts and positions the paper surface, pushing the ruler body 1, and the ruler body 1 can rotate around the center 3. When the circular drawing plate 2 is positioned by the pressure cap 24, the pen tip passes through the circular drawing hole 22 to draw a circle or arc construction line. The center 3 and the circular drawing plate 2 are accurately and reliably positioned, and thus, without carrying a compass, the surveying ruler can accurately draw a circle or arc, thereby expanding the use function of the surveying ruler.

[0041] In order to avoid damaging the center 3 and the cone 31 of the center 3 and affecting the normal use of the ruler body 1, a secondary core hole 13 is opened on the ruler body 1. The depth of the secondary core hole 13 is greater than the depth of the core hole 12 and is used to install the center 3 and keep the cone 31 of the center 3 away from the paper.

[0042] See also Figure 3-5 As shown, a flange is formed on the edge of the drawing circular plate 2, which is slidably connected to the slide groove 11 of the T-shaped structure through the flange. A connecting column 21 is fixedly connected to the upper surface of the drawing circular plate 2. The connecting column 21 is formed with an external thread for threaded connection with the pressure cap 24, and the connecting column 21 is located at the lower part of the pressure cap 24 and is fitted with a pressure plate 23. The pressure cap 24 contacts the ruler body 1 through the pressure plate 23, thereby clamping the ruler body 1 through the pressure plate 23 and the flange, so that the drawing circular plate 2 can be fixedly connected to the ruler body 1 at any position.

[0043] See also Figure 3As shown, in order to ensure that the circular drawing holes 22 are compatible with pen tips of different diameters, the circular drawing plate 2 is provided with a plurality of circular drawing holes 22 of different diameters at intervals, and a centering line is provided on both sides of the circular drawing holes 22 on the circular drawing plate 2, which corresponds to the scale lines on the ruler body 1;

[0044] See also Figure 8 As shown, in a preferred embodiment, circular through holes 22 are symmetrically provided on both sides of the circular plate 2. In this structure, by symmetrically providing the circular through holes 22 on both sides of the circular plate 2, it can be effectively ensured that the circular through holes 22 are closer to the center of the circle.

[0045] See also Figure 6 、 7 As shown, the center 3 includes a core column, which is circular and magnetic. The core column cooperates with the core hole 12 and is fixedly connected to the ruler body 1 by magnetic force. The top of the core column is fixedly connected to a handle 32 larger than its diameter, and a cone 31 is formed at the bottom of the core column. When in use, the center 3 is adsorbed on the core hole 12 by magnetic force. In order to ensure that the center of the circle is visible when drawing a circle, the center 3 can be made of transparent material, and magnetic blocks can be added locally to ensure that the center 3 can be fixedly connected to the ruler body 1 while ensuring that the center of the circle is visible.

[0046] See also Figure 1 As shown, preferably, a functional area is arranged on the upper surface of the ruler body 1.

[0047] The functional area includes a first straight line area 4, a second straight line area, a protractor area 6, a circle drawing area 7, and a polygon drawing area 8;

[0048] The straight section on the side of the ruler body 1 forms a first straight area 4, and the ruler body 1 forms a second straight area 5 on both sides of the slide 11. The first straight area 4 and the second straight area 5 are both provided with scale lines, and the second straight area 5 can be provided with imperial scale lines and metric scale lines for easy use.

[0049] A protractor area 6 is provided at one end of the ruler body 1, and a calibration hole is provided on the scale line of the protractor area 6. When in use, the ruler body 1 is prevented from blocking too large an area and blocking the lines. The calibration hole effectively solves the problem of the ruler body 1 blocking the lines.

[0050] The ruler body 1 is located on the side of the slide groove 11 and is sequentially formed with a circular drawing area 7 and a polygonal drawing area 8. A plurality of small circles of different diameters are arranged in the circular drawing area 7, and the small circles can be used to directly complete the circle drawing. In the polygonal drawing area 8, a plurality of hexagons of different sizes, as well as polygons such as 45° right-angled triangles and 60° and 30° right-angled triangles are arranged.

[0051] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A surveying ruler, characterized in that: include: A ruler body (1), a drawing circular plate (2) installed in a slide groove (11) provided along the length direction of the ruler body (1) and slidably connected to the slide groove (11); The top of the drawing circular plate (2) is provided with a pressure cap (24) for fixedly connecting it to any position of the ruler body (1), and the drawing circular plate (2) is provided with at least one drawing circular through hole (22) through which a pen tip can pass; and A centering center (3) for locating the center of a circle is provided with a cone (31) at its lower portion, and a core hole (12) is provided at the end of the ruler body (1) located at the slide groove (11) for installing the centering center (3) and for making the cone (31) protrude from the surface of the ruler body (1) and contact the paper surface; and A secondary core hole (13) with a depth greater than that of the core hole (12) is provided on the ruler body (1) and is used for installing the alignment center (3) and keeping the cone (31) away from the paper surface.

2. A surveying ruler according to claim 1, characterized in that: The edge of the drawing circular plate (2) is formed with a flange for sliding connection with the sliding groove (11) of the T-shaped structure, and a connecting column (21) is fixedly connected to the upper surface of the drawing circular plate (2), and the connecting column (21) is threadedly connected to the pressure cap (24), and the connecting column (21) is located at the lower part of the pressure cap (24) and is covered with a pressure plate (23).

3. A surveying ruler according to claim 2, characterized in that: The circular drawing plate (2) is provided with a plurality of circular drawing through holes (22) of different diameters at intervals, and centering lines are provided on both sides of the circular drawing through holes (22) on the circular drawing plate (2).

4. A surveying ruler according to claim 3, characterized in that: The circular drawing through holes (22) are symmetrically provided on both sides of the circular drawing plate (2).

5. A surveying ruler according to claim 1, characterized in that: The alignment center (3) comprises a circular core column with magnetic structure for cooperating with the core hole (12); the top end of the core column is fixedly connected to a handle (32) larger than its diameter; the bottom end of the core column is formed with the cone (31).

6. A surveying ruler according to any one of claims 1 to 5, characterized in that ； The upper surface of the ruler body (1) is provided with a functional area.

7. A surveying ruler according to claim 6, characterized in that ； The functional area includes a first straight line area (4), a second straight line area, a protractor area (6), a circle drawing area (7), and a polygon drawing area (8); The first straight area (4), the second straight area, the protractor area (6), the circular drawing area (7), and the polygonal drawing area (8) are arranged around the periphery of the slide groove (11).

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