CN210851807U - Portable simple compasses capable of determining radius - Google Patents

Portable simple compasses capable of determining radius Download PDF

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Publication number
CN210851807U
CN210851807U CN201921664775.3U CN201921664775U CN210851807U CN 210851807 U CN210851807 U CN 210851807U CN 201921664775 U CN201921664775 U CN 201921664775U CN 210851807 U CN210851807 U CN 210851807U
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China
Prior art keywords
arm
line
scale
compasses
point
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Expired - Fee Related
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CN201921664775.3U
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Chinese (zh)
Inventor
赵微
高扬
白旭亚
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Daqing Normal University
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Daqing Normal University
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Abstract

The utility model discloses a can confirm radial portable simple and easy compasses relates to the mathematical tool field, include: the compasses comprise a compasses main body, wherein the compasses main body is provided with a first fulcrum arm (1) and a second line drawing arm (2); the lower side of the first fulcrum arm (1) is provided with a steel needle, the outer side of the first fulcrum arm (1) is provided with a 0-point indication line (3), the lower side of the second line drawing arm (2) is provided with a line drawing pen, and the outer side of the second line drawing arm (2) is provided with a scale indication line (4); the first fulcrum arm (1) is fixedly connected with a flexible rule belt (5), and a zero point of the flexible rule belt (5) is aligned with the 0-point indicating line (3); the scale from the flexible rule belt (5) to the scale indication line (4) is an actual radius value. The compasses can solve the problems that the compasses which are not provided with a scale cannot draw a circle with a set radius and the compasses with the determined radius at present have complex structures and are difficult to operate.

Description

Portable simple compasses capable of determining radius
Technical Field
The utility model relates to a mathematics instrument field, but specifically says so a can confirm radial portable simple and easy compasses.
Background
Compasses are used for drawing circles or strings in mathematics and drawing, and are commonly used for drawing rulers and compasses. The application method of the compasses comprises the steps of measuring the distance between two feet of the compasses by using a ruler as a radius; fixing one end with a needle at one place as a circle center; the end with the pencil is rotated for a circle.
If the graduated scale is not carried with the user, a circle with a set radius cannot be drawn; the number CN205416884U discloses a compass, which can also draw a circle with a set radius, when the compass is used, a positioning screw rod is rotated downwards anticlockwise, then a radius scale is rotated around a fixing cap until an adjusting groove on the radius scale corresponds to a hole position of the positioning screw rod, the positioning screw rod is rotated upwards, then according to the determined radius, the relative position relation between an adjusting support rod and a rotating rod of the radius scale is contrasted, and when the radius is adjusted to the required radius, the positioning screw rod is fixed for drawing; however, in the process of drawing a circle with a fixed radius, the drawing operation is complicated, and the original structure of the compasses is changed.
Disclosure of Invention
In view of this, the utility model provides a but radial portable simple and easy compasses to solve and not taking the scale with oneself and then can't draw the radial circle of settlement, and the difficult problem of operation of the compasses structure complicacy of present definite radius.
The utility model provides a can confirm radial portable simple and easy compasses, include: the compasses comprise a compasses main body, a first support arm and a second drawing arm, wherein the compasses main body is provided with the first support arm and the second drawing arm;
the lower side of the first fulcrum arm is provided with a steel needle, the outer side of the first fulcrum arm is provided with a 0-point indication line, the lower side of the second line drawing arm is provided with a line drawing pen, and the outer side of the second line drawing arm is provided with a scale indication line;
the first fulcrum arm is fixedly connected with the flexible rule belt, and the zero point of the flexible rule belt is aligned with the 0 point indicating line;
the scale displayed by the scale indication line brought by the tape is the actual radius value.
Preferably, the 0-point indicating line is on the same straight line with the needle point of the steel needle; the scale indicating lines and the pen point of the line drawing pen are on the same straight line.
Preferably, the first fulcrum arm is connected to the tape measure strip by a set screw.
Preferably, the total length of the first fulcrum arm and the tip of the steel needle is equal to the total length of the second line drawing arm and the nib of the line drawing pen.
Preferably, the lower side of the zero scale line of the flexible rule belt is at the center of the total length of the first fulcrum arm and the steel needle.
The utility model discloses following beneficial effect has:
the utility model provides a can confirm radial portable simple and easy compasses to solve and not take the scale with oneself then can't draw and set for radial circle, and confirm the problem that radial compasses structure is complicated to be difficult for operating at present. The utility model discloses need not change the inherent shape of compasses, directly set for the scale through the position of soft chi area at first point arm and second setting-out arm, accomplish the drawing of compasses. And simultaneously, the utility model discloses a flexible rule area can twine on first point arm and the second setting-out arm of compasses, conveniently carries.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a portable simple compass capable of determining a radius according to an embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for parts not described in detail, those skilled in the art can fully understand the present invention.
Furthermore, those skilled in the art will appreciate that the drawings are provided for purposes of illustrating the objects, features, and advantages of the invention and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is a schematic structural view of a portable simple compass capable of determining a radius according to an embodiment of the present invention. As shown in fig. 1, a portable simple compass capable of determining a radius includes: the compasses comprise a compasses main body, wherein the compasses main body is provided with a first fulcrum arm 1 and a second line drawing arm 2; a steel needle is arranged on the lower side of the first fulcrum arm 1, a 0-point indication line 3 is arranged on the outer side of the first fulcrum arm 1, a line drawing pen is arranged on the lower side of the second line drawing arm 2, and a scale indication line 4 is arranged on the outer side of the second line drawing arm 2; the first fulcrum arm 1 is fixedly connected with the flexible rule belt 5, and the zero point of the flexible rule belt 5 is aligned with the 0 point indicating line 3; the scale displayed from the flexible rule belt 5 to the scale indicating line 4 is the actual radius value. Specifically, when one end of the flexible rule belt 5 is fixed on the first fulcrum arm 1, when drawing a circle, the flexible rule belt 5 is straightened so that the flexible rule belt 5 is parallel to the drawing plane, the second line drawing arm 2 is adjusted, when the lower side of the scale on the flexible rule belt 5 is consistent with the scale indicating line 4 (namely, when the lower side of the scale on the flexible rule belt 5 and the scale indicating line 4 have an intersection point), the set radius of the circle is obtained, at the moment, the flexible rule belt 5 is loosened, the needle point of the steel needle is used as an original point, and the pen point of the line drawing pen draws the circle with the set radius of the circle, so that the problems that the circle with the set radius cannot be drawn when the scale is not carried around and the existing compasses with the determined radius have a complicated structure and are difficult to operate are.
In the compasses disclosed in the publication No. CN205416884U, the radius scale can be fixed on one side of the support rod when not in use, and the radius scale is further provided with an adjusting groove for the positioning screw to slide in the adjusting groove to adjust the scale of the scale, so that the compasses with determined radius have the problem of complicated structure and difficult operation. Based on the function, the scale must be a hard scale.
And the utility model discloses a flexible rule area can be conveniently through the volume that the mode of rolling up flexible rule area reduces the scale and occupy, can adjust the range that the flexible rule area expandes according to used scale moreover. That is to say, this practicality adopts soft chi area, can not receive the narrow and small restriction of workspace in the use.
The utility model discloses a flexible rule area can twine on the first point arm of compasses and second setting-out arm, conveniently carries. The operation of collection and convenient carrying can be finished only by winding the tape on the first branch point arm and the second line drawing arm of the compasses.
Specifically, in fig. 1, when drawing a circle, the soft rule belt 5 is pulled to the parallel positioning point 7, the parallel positioning point 7 corresponds to a certain scale value of the soft rule belt 5, at this time, the soft rule belt 5 is parallel to the drawing plane, then the soft rule belt 5 is straightened, the second line drawing arm 2 is adjusted, when the lower side of the scale on the soft rule belt 5 is consistent with the scale indicating line 4 (that is, when the lower side of the scale on the soft rule belt 5 has an intersection point with the scale indicating line 4), the set circle radius is obtained, at this time, the soft rule belt 5 is loosened, the tip of the steel needle is used as an origin, and the nib of the line drawing pen draws a circle with the set circle radius.
That is, in fig. 1, the second scribing arm 2 is further provided with a parallel positioning point 7, and when the parallel positioning point 7 corresponds to a certain scale value in the flexible rule strip 5, the flexible rule strip 5 is parallel to the drawing plane. At this time, the set radius is obtained, the flexible rule belt 5 is loosened, the point of the steel needle is used as the origin, and the pen point of the line drawing pen draws a circle with the set radius.
In fig. 1, the scale of the tape 5 is not a standard scale but is a scale determined according to the position of the tape 5 on the first fulcrum arm 1, the first fulcrum arm 1 and the second line drawing arm 2 form a first triangle with the drawing plane, the first fulcrum arm 1 and the second line drawing arm 2 form a second triangle with the tape 5 straightened (i.e. the tape 5 is parallel to the drawing plane), and the first triangle and the second triangle are 2 similar triangles, so that the scale of the tape 5 has a proportional relationship with the set radius, such as: the radius is set to be 2cm, if the ratio of the distance from the fixed end of the flexible rule belt 5 and the first fulcrum arm 1 (based on the lower side of the zero scale line of the rule belt 5) to the hinged end of the second line drawing arm 2 to the distance from the fixed end of the flexible rule belt 5 and the first fulcrum arm 1 to the steel needle tip on the lower side of the first fulcrum arm 1 is 1:1, the scale value of the flexible rule belt 5 is displayed to be 2cm at the moment, and the actual scale value of the flexible rule belt 5 is 1 cm.
In fig. 1, in order to ensure the accuracy of the set radius, a 0 point indicating line 3 is on the same straight line with the needle tip of the steel needle; the scale indication lines 4 are on the same straight line with the pen point of the line drawing pen. And in the process of adjusting the second line drawing arm 3, the scale displayed by the intersection point of the flexible rule belt 5 and the scale indication line 4 is the actual radius value.
In the utility model, the steel needle point at the lower side of the first fulcrum arm 1 is fixedly connected, the line drawing pen is also fixedly connected with the second line drawing arm 2, the line drawing pen can be a sign pen, a pen or a water-based oil pen, and the pen point of the line drawing pen is not suggested to be easily worn and changed in length so as not to influence the accuracy of the utility model; the length of the steel needle and the line drawing pen can be set for the practicability, so that the steel needle and the line drawing pen can be replaced.
In fig. 1, the first fulcrum arm 1 is connected to the flexible rule band 5 by a fixing screw 6. That is, the flexible rule band 5 is fixed to the first fulcrum arm 1 by 3 fixing screws 6.
In fig. 1, preferably, the total length of the first fulcrum arm 1 and the tip of the stylus is equal to the total length of the second line drawing arm 2 and the nib of the line drawing pen, that is, the first triangle formed by the first fulcrum arm 1 and the second line drawing arm 2 and the drawing plane is an isosceles triangle.
In fig. 1, the lower side of the zero scale line of the flexible rule band 5 is preferably at the center of the total length of the first fulcrum arm 1 and the steel needle. That is, the lower side of the zero point scale line of the tape 5 is on the isosceles line of the first triangle (isosceles triangle).
The utility model discloses a theory of operation: the two line drawing arms 2 are provided with parallel positioning points 7 and scale indicating lines 4, and the corresponding first fulcrum arm 1 of the compasses is provided with 0 point indicating line. In the process of using the compasses, can correspond the zero point scale of soft chi area and 0 some index line on the first arm of fulcrum, and correspond parallel setpoint 7 and certain scale interval in soft chi area, can adjust this moment and make soft chi area parallel with the drawing face, then can adjust the position of setting-out pen on the second setting-out arm, because the relative position of second setting-out arm and first arm of fulcrum changes, the nodical no longer is parallel setpoint 7 between soft chi area and the second setting-out arm this moment, the nodical radius value that is the compasses of nodical between soft chi area and the scale index line this moment. That is, the parallel positioning point of the present application is for determining the parallelism of the soft tape and the drawing surface, and the scale indicating lines are for determining the compass radius from the change of the intersection point of the second line arm and the soft tape when the intersection point is changed when the second line arm is adjusted.
Meanwhile, as the patent disclosed in the background art adopts technical features of a fixing cap, a positioning screw rod, a radius scale and the like, an opening angle (i.e., radius) of the support rod and the rotating rod is limited to the length of an adjustment groove of the radius scale. And the utility model discloses a soft chi area does not change the inherent structure of compasses, also can not restrict the angle that first fulcrum arm 1 and second setting-out arm were opened, and the angle that first fulcrum arm 1 and second setting-out arm 2 of the compasses that do not increase the soft chi and increase soft chi area were opened is the same completely, can not receive the restriction in soft chi area.
Further, the setting of the scale indicating line of this application can solve the drawback problem that the patent disclosed in the background art is in. Because the radius scale that patent disclosed in the background art used is the ruler, when using moreover, need make the positioning screw slide in the adjustment tank of scale, consequently need bracing piece and rotary rod to adjust the use together, just can guarantee that the positioning screw can slide in the adjustment tank. This is because if only remove bracing piece or rotary rod, positioning screw can receive the width restriction of adjustment tank, and can't remove, perhaps need make the one end perk of bracing piece or rotary rod, just can realize positioning screw's normal removal in the adjustment tank, perhaps the width of adjustment tank also need set up to suitable width, just can guarantee positioning screw's smooth and easy removal.
The technical scheme of this application does not exist above-mentioned technical problem, because the scale that this application set up is the tape, it only needs at first to make the scale value of setting for correspond with parallel setpoint and can confirm the tape and draw planar parallel state in the use, and then only needs to adjust second setting-out arm 3 for the intersection point of the scale value of tape 5 of tape and scale adjustment groove is required radius value, both can adjust the radius of compasses. This process is not limited by the problems of the patents disclosed in the above background.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions, modifications, etc. can be made without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (1)

1. A portable simple compass capable of determining radius, comprising: the compasses main part, its characterized in that:
the compasses main body is provided with a first fulcrum arm (1) and a second line drawing arm (2);
the lower side of the first fulcrum arm (1) is provided with a steel needle, the outer side of the first fulcrum arm (1) is provided with a 0-point indication line (3), the lower side of the second line drawing arm (2) is provided with a line drawing pen, and the outer side of the second line drawing arm (2) is provided with a scale indication line (4);
the first fulcrum arm (1) is fixedly connected with a flexible rule belt (5), and a zero point of the flexible rule belt (5) is aligned with the 0-point indicating line (3);
the scale displayed from the flexible rule belt (5) to the scale indicating line (4) is an actual radius value;
wherein the 0 point indicating line (3) and the needle point of the steel needle are on the same straight line;
the scale indication line (4) and the pen point of the line drawing pen are on the same straight line;
the scale indicating lines (4) are used for determining the radius of the compasses according to the change of an intersection point when the second line drawing arm is adjusted and the intersection point of the second line drawing arm and the flexible ruler belt is changed;
the total length of the first fulcrum arm (1) and the tip of the steel needle is equal to the total length of the second line drawing arm (2) and the nib of the line drawing pen;
the lower side of the zero scale mark of the flexible rule belt (5) is positioned at the center of the total length of the first fulcrum arm (1) and the steel needle;
wherein the first fulcrum arm (1) is connected with the tape (5) through a fixing screw (6).
CN201921664775.3U 2019-09-30 2019-09-30 Portable simple compasses capable of determining radius Expired - Fee Related CN210851807U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921664775.3U CN210851807U (en) 2019-09-30 2019-09-30 Portable simple compasses capable of determining radius

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921664775.3U CN210851807U (en) 2019-09-30 2019-09-30 Portable simple compasses capable of determining radius

Publications (1)

Publication Number Publication Date
CN210851807U true CN210851807U (en) 2020-06-26

Family

ID=71304375

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921664775.3U Expired - Fee Related CN210851807U (en) 2019-09-30 2019-09-30 Portable simple compasses capable of determining radius

Country Status (1)

Country Link
CN (1) CN210851807U (en)

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200626

Termination date: 20210930

CF01 Termination of patent right due to non-payment of annual fee