KR20050072657A - Protractor - Google Patents

Abstract

The present invention relates to an angle measuring device,

An upper plate portion 100 having a predetermined length; A main body part 200 coupled to the upper plate part 100 in a rotatable state and coupled to have a rotation angle including a range of 0 to 180 degrees based on the center point of rotation; Tape measure which is built in the main body part 200 in the state wound around the roller 220, and is fixed at a predetermined point on the inner surface of the upper plate part 100 while the end is drawn out from a predetermined point on the inner surface of the main body part 200. It includes; 230, the upper plate portion 100 and the main body portion 200 is rotated to coincide with both sides of the angle measuring object so that the rotation angle is in the state coinciding with the measurement angle (α), the main body withdrawal The angle scale of the tape measure 230 corresponding to the point position is configured to represent the measurement angle α,

It is portable in a folded state and is formed in a structure that is unfolded in correspondence with the angle of the object to be measured when the angle is measured, thereby providing good ease of use at various work sites.

Description

Angle meter {Protractor}

The present invention relates to an angle measuring device, and more particularly, can be carried in a folded state, and is formed in a structure that is unfolded corresponding to the angle of the measurement object when measuring the angle, thereby improving the ease of use in various work sites. It relates to a measuring instrument.

The angle measuring device is a tool for measuring the angle between the line segments extending from both sides with respect to the center point, and is used to measure the angle of the structure in various fields such as civil engineering, construction, and machinery.

10 is a configuration diagram showing an example of a conventional angle measuring device.

The illustrated protractor is the most common configuration, and an angle scale is displayed along the circumference of the main body composed of a semi-circular plate member to measure an angle represented by an arbitrary line segment.

Based on this form, variations of various applications have been made, but the existing protractor has a form that does not deviate significantly from the semi-circular plate body exemplified by the angle measuring unit.

By the way, since the conventional conventional protractor is basically provided with the angle measuring part of the semi-circular plate body, there existed a problem that carrying was inconvenient.

In particular, when used for civil engineering or construction, it is difficult to carry the protractor of the semi-circular plate in the field work, the work convenience was not good.

The present invention has been made in view of the above problems, it is possible to carry in a folded state, is formed in a structure that is unfolded corresponding to the angle of the measurement object when measuring the angle, improved usability in various work sites It is an object to provide an angle measuring device.

The present invention for achieving the above object, the upper plate portion 100 having a predetermined length; A main body part 200 coupled to the upper plate part 100 in a rotatable state and coupled to have a rotation angle including a range of 0 to 180 degrees based on the center point of rotation; Tape measure which is built in the main body part 200 in the state wound around the roller 220, and is fixed at a predetermined point on the inner surface of the upper plate part 100 while the end is drawn out from a predetermined point on the inner surface of the main body part 200. It includes; 230, the upper plate portion 100 and the main body portion 200 is rotated to coincide with both sides of the angle measuring object so that the rotation angle is in the state coinciding with the measurement angle (α), the main body withdrawal The angular scale of the tape measure 230 corresponding to the point position is configured to represent the measurement angle α.

More preferably, in the present invention, the distance (a) from the pivot center point to the main body part withdrawal point of the tape measure 230 and the distance (a) from the pivot center point to the top plate fixing point of the tape measure 230 are the same. The measurement angle α is formed to be displayed as an angle scale at a position on the tape measure 230 corresponding to the following c value with respect to the fixed side end of the tape measure.

[Equation 1]

(Where α is the measurement angle or rotation angle,

a is the distance from the center of rotation to the point of withdrawing the body of the tape measure)

More preferably, the inner surface of the main body portion 200 is provided with an elevation measuring plate 210 capable of selective upright manipulation at a tape measure 230 withdrawal point, the elevation measuring plate 210 is the main body 200 When perpendicular to the inner surface, the tape measure 230 drawn out from the main body 200 is formed to reach the upper plate fixing point in a bent state through the upper end of the elevation measuring plate 210, and the elevation range. The measurement angle of is formed to be displayed as a high-angle scale at a position on the tape measure 230 corresponding to the following d value with respect to the fixed side end of the tape measure.

[Equation 2]

(Where b is the height of the elevation plate,

c is a value obtained by Equation 1,

β is a value obtained by the following equation (3);

[Equation 3]

β = 90-{(180-α) / 2})

More preferably, the inner surface of the main body portion 200 is provided with an elevation measuring plate 210 capable of selective upright manipulation at a tape measure 230 withdrawal point, the elevation measuring plate 210 is the main body 200 When perpendicular to the inner surface, the tape measure 230 drawn out from the main body 200 is formed to reach the upper plate fixing point in a bent state through the upper end of the elevation measuring plate 210, and the elevation range. The measuring angle of is formed to be displayed as a high-angle scale at a position on the tape measure 230 corresponding to the b + d value with respect to the fixed side end of the tape measure.

More preferably, in the roller 220 to which the tape measure 230 is wound, gripping means for imparting rotation restoring force are provided.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view at the time of measuring the low angle of the angle measuring device according to an embodiment of the present invention, Figure 2 is a perspective view at the time of measuring the high angle of the angle measuring device according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention Figure 4 is an exploded perspective view of the angle measuring device, Figure 4 is a perspective view of the tape winding unit of the angle measuring device according to an embodiment of the present invention, Figure 5a is a conceptual diagram for explaining the measuring principle of the angle measuring device according to an embodiment of the present invention, Figure 5B is a side view of the angle measuring device according to the embodiment of the present invention corresponding to FIG. 5A, and FIG. 6 is a plan view of a tape measure of the angle measuring device according to the embodiment of the present invention.

A rectangular upper plate portion 100 having a predetermined length is provided.

In addition, the main body 200 is hinged so that the upper plate 100 and the rotatable state, the main body 200 is coupled to have a rotation angle including a range of 0 ~ 180 degrees relative to the center of rotation (m). .

To this end, hinge portions 104 and 204 are formed at the ends of the upper plate portion 100 and the main body portion 200, respectively, and are connected and connected by the hinge shafts 102.

On the other hand, the tape measure 230 is displayed in the body portion 200 in a state in which the angular scale is displayed on the roller 220. As the material of the tape measure 230, it is preferable that a length deformation does not occur even after long-term use, and a general tape measure synthetic resin material, a fiber material, a thin metal material, or the like may be used.

The tape measure 230 is drawn out from a predetermined point of the inner surface of the main body portion 200, and its end is fixed to the predetermined point of the inner surface of the upper plate portion 100 through the fixing pin 104.

The hinge portion 204 of the main body 200 is preferably formed to be flush with the upper surface of the main body 200 so that the tape measure 230 can be a complete date when the rotation angle is 180 degrees. .

The roller 220 to which the tape measure 230 is wound is provided with a gripping means for imparting a rotation restoring force. As the gripping means, various spring structures of a known type may be employed.

For example, as shown in FIG. 4, the inside of the roller 220 is formed in a hollow shape, and the roller shaft 222 is coupled in a state in which the coil spring 226 is embedded therein, thereby pulling out the tape measure 230. It can be set as the structure by which the clamping force by the coil spring 226 is provided at the time.

Such an angle measuring device is a tape measure corresponding to the position of the main body drawing point in a state where the upper plate part 100 and the main body part 200 are rotated so as to coincide with both line segments of the angle measuring object and the rotation angle coincides with the measuring angle α. An angle scale of 230 is configured to represent the measurement angle α.

The principle that the angular scale of the measurement angle (alpha) is displayed on the tape measure 230 is demonstrated.

The angle measuring device of this embodiment is such that the distance a from the rotation center point m to the main body part extraction point of the tape measure 230 and the distance a from the rotation center point to the top plate fixing point of the tape measure 230 are equal to each other. Is formed.

At this time, the measurement angle α is formed to be displayed as an angle scale at a position on the tape measure 230 corresponding to the following c value with respect to the fixed side end of the tape measure.

[Equation 1]

(Where α is the measurement angle or rotation angle,

a is the distance from the center of rotation to the point of withdrawing the body of the tape measure)

The process in which Equation 1 is derived will be described in more detail.

When the top plate 100 is rotated for the angle measurement and the tape measure 230 is drawn out, the angle measuring device of the present embodiment forms an isosceles triangle (side lengths a, a, c) of the shapes shown in FIGS. 5A and 5B. do.

In this case, when the sin law is applied, Equation 1-1 is obtained, and Equation 1 is derived therefrom.

[Equation 1-1]

For example, if the angle measuring device is manufactured so that a is 100 mm in length, the angle scale position c corresponding to each measuring angle α is obtained as shown in Table 1 below.

TABLE 1

Measurement angle (α, unit degree) Angular scale position (c, unit mm) 10 17.4311 20 34.7296 30 51.7638 40 68.404 50 84.5237 60 100 70 114.7153 80 128.5575 90 141.4214 100 153.2089 110 163.8304 120 173.2051 130 181.2616 140 187.9385 150 193.1852 160 196.9616 170 199.2389 180 200

However, in Table 1, it can be seen that as the value of the measurement angle α increases, the interval between the angle graduation positions becomes narrower.

In consideration of this point, a method of sufficiently increasing the size (or size of a value) of the angle measuring device may be provided. However, in the present embodiment, the angle measuring interval is wide enough even at a high angle using the high angle measuring plate 210 described later. Should be obtained.

The inner surface of the main body 200 is provided with an elevation measuring plate 210 capable of selective upright manipulation at a tape measure 230 withdrawal point.

The elevation measuring plate 210 is supported by the step 202 and the hinge axis 210 in the low angle measurement, and is in a state built in the main body 200, and the elevation angle of which the angle interval is narrowed (for example, 100). In the measurement, the upright operation is performed by rotating about the hinge axis 210 by a user's operation.

After the upright operation, the bottom of the elevation measuring plate 210 is supported and fixed by a separate fixing piece 211 so that a solid fixing state is achieved. The fixing piece 211 may be formed in a sliding manner as illustrated, but may be modified in other forms having the same function.

In addition, a separate roller (not shown) may be attached to the upper end of the elevation measuring plate 210 so that the tape measure 230 may be smoothly moved.

When the elevation measuring plate 210 is perpendicular to the inner surface of the main body 200, the tape measure 230 drawn from the main body 200 is bent through the upper end of the elevation measuring plate 210. The top plate is fixed.

At this time, the measurement angle α of the high angle range is formed to be displayed as an angle scale at a position on the tape measure 230 corresponding to the following d value with respect to the fixed side end of the tape measure.

[Equation 2]

(Where b is the height of the elevation plate,

c is a value obtained by Equation 1,

β is a value obtained by the following equation (3);

[Equation 3]

β = 90-{(180-α) / 2})

The process in which Equation 2 is derived will be described in more detail.

When the top plate 100 is rotated to measure the angle, and the elevation measuring plate 210 is operated upright at the time when the tape measure 230 is pulled out, the angle measuring device according to the present embodiment has a triangle (side) shown in FIGS. 5A and 5B. Lengths b, c, and d) are virtually formed.

At this time, if the second cos law is applied, Equation 2 is obtained.

For example, if an angle measuring device is manufactured such that a is 100 mm and b is 80 mm in length, the elevation angle scale position d corresponding to each measuring angle α is represented by Equation 2 as shown in Table 2 below. Is saved.

TABLE 2

Measurement angle (α, unit degree) Elevation angle scale position (d, unit mm) 10 62.6537 20 46.1934 30 32.8556 40 28.187 50 35.8823 60 50.4341 70 67.2645 80 84.6765 90 101.9804 100 118.8109 110 134.9271 120 150.1453 130 164.3139 140 177.3028 150 188.9987 160 199.3027 170 208.1292 180 215.4066

Looking at Table 2 it can be seen that the distance between the angle scale position in the elevation is relatively wider than Table 1, it can be seen that the elevation measurement is easier by the use of the elevation plate 210.

However, since the obtained d has a characteristic of the solution of the quadratic function, it has a minimum value at a predetermined point, and in Table 2, it has such a minimum value at about 40 degrees. Therefore, when marking the elevation angle scale by actual d value, it should be displayed only for the range after this minimum value.

On the other hand, in the present embodiment has been described that the high-angle scale is displayed at the d position obtained as described above, the high-angle scale can be recognized at the upper end of the high-angle measuring plate 210, it is somewhat modified to the b + d position The high-angle scale is displayed, it may be configured to recognize the high-angle scale at the position of the body portion withdrawal point of the tape measure 230.

At this time, the display position of the high-angle scale on the tape measure 230 may be shifted and displayed by b value.

On the other hand, it may be provided with a tape measure fixing means in addition to the basic structure of the embodiment. The tape measure fixing means serves to fix the tape measure so as not to shake at the time of measuring the angle, it may be applied to a type similar to that employed in the general draw-out tape measure.

7 is a perspective view of an angle measuring device according to another embodiment of the present invention.

In the present embodiment, the thickness t1 of the upper plate portion and the thickness t2 of the main body portion are formed to have the same value. When the thicknesses t1 and t2 are formed at the same value as described above, the measurement angle α can be measured by bringing the outer surface of the angle measuring device into contact with the surface of the measurement object.

In particular, by forming a thin thickness on both sides it is possible to manufacture a light weight and a simple angle measuring device in terms of design. For this purpose, the tape measure 230 wound roller 220 after being positioned somewhat rearwardly as shown in FIG. It is preferable to install the idle roller 242 at the position of the main body pull-out point so that the 230 can be smoothly drawn out.

Thus, when the tape measure 230 is wound around the roller 220 is somewhat spaced apart rear, it is possible to install the upper portion of the roller 230 to protrude slightly to the upper surface of the body portion 200, corresponding to this If the groove portion 162 of the appropriate size is formed at the position of the upper plate portion 100, it becomes possible to manufacture an angle measuring device of a thin thickness as a whole.

8 is a perspective view of an angle measuring device according to still another embodiment of the present invention, and FIG. 9 is a conceptual view illustrating an angle measuring example using the angle measuring device of FIG. 8.

In this embodiment, the level 282 is installed at a predetermined point on the inner surface of the main body 200. When the level 282 is installed in this way, since the angle measuring unit 200 may be positioned to form a horizontal plane, the angle of the inclined plane may be measured as shown in FIG. 9.

For example, when the main body 200 is rotated using the leveler 282 in a state where the outer surface of the upper plate part 100 is in close contact with the inclined surface, the angle value measured at that time becomes the inclination angle of the inclined surface. .

As another example, since the main body 200 can be horizontally set using the level 282 even when the ground does not form an accurate horizontal plane, it becomes possible to find an accurate inclination angle from the ground.

On the other hand, in the form shown in Figures 7 to 8, it is preferable that a scale 252 for measuring the length is formed on the side of the upper plate portion 100 and the main body portion 200.

When the scale 252 is formed as described above, the angle measuring device of the present embodiment may be used as a length measuring device in civil engineering and construction sites in addition to the angle measuring.

In particular, when using the length measuring scale 252 and the angle measuring tape 230 at the same time, using the trigonometric function (eg cosine law) for the length and angle to find the length of the unknown side It can also be used as a learning tool for students.

For example, since the distance a from the pivot center point to the body part withdrawal point of the tape measure 230 and the distance a from the pivot center point to the top plate fixing point of the tape measure 230 are known, the measurement angle α is determined. The length of the tape measure 230 when set to an arbitrary value can be obtained through the cosine law.

The present invention described above can be embodied in many different forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be construed as limiting.

The present invention is portable in a folded state and is formed in a structure that is unfolded in correspondence with the angle of the measurement object at the time of angle measurement, thereby providing good ease of use at various work sites.

In particular, it is equipped with a high angle measuring plate that can be selectively operated, it is possible to precise angle measurement with a simple operation according to the height of the measured angle value.

1 is a perspective view of a low angle measurement of the angle measuring device according to an embodiment of the present invention,

2 is a perspective view of the angle measuring angle measuring device according to an embodiment of the present invention,

3 is an exploded perspective view of an angle measuring device according to an embodiment of the present invention;

4 is a perspective view of a tape winding unit of an angle measuring device according to an embodiment of the present invention;

5A is a conceptual diagram illustrating a measuring principle of an angle measuring device according to an embodiment of the present invention;

Figure 5b is a side view of the angle measuring device according to an embodiment of the present invention corresponding to Figure 5a,

6 is a plan view of a tape measure of the angle measuring device according to an embodiment of the present invention;

7 is a perspective view of an angle measuring device according to another embodiment of the present invention;

8 is a perspective view of an angle measuring device according to another embodiment of the present invention;

9 is a conceptual diagram illustrating an example of angle measurement using the angle measurer of FIG. 8;

10 is a configuration diagram showing an example of a conventional protractor.

<Description of Symbols for Main Parts of Drawings>

100: upper plate 200: main body

210: elevation measuring plate 220: roller

230: tape measure 282: level

α: measuring angle

a: Distance from the center of rotation to the point of withdrawing the body part of the tape measure or from the center of rotation to the top plate fixing point of the tape measure

b: height of elevation plate

c: the position at which the measurement angle is indicated on the tape measure relative to the fixed end of the tape measure

d: the position at which the corresponding elevation angle is displayed on the tape measure relative to the fixed end of the tape measure

t1, t2: thickness of the upper plate and main body

Claims (8)

An upper plate portion 100 having a predetermined length; A main body part 200 coupled to the upper plate part 100 in a rotatable state and coupled to have a rotation angle including a range of 0 to 180 degrees based on the center point of rotation; Tape measure which is built in the main body part 200 in the state wound around the roller 220, and is fixed at a predetermined point on the inner surface of the upper plate part 100 while the end is drawn out from a predetermined point on the inner surface of the main body part 200. 230; The tape measure 230 corresponding to the position of the main body part withdrawal point in a state in which the upper plate part 100 and the main body part 200 are rotated to coincide with both line segments of the angle measuring object and the rotation angle coincides with the measuring angle α. An angle scale configured to indicate the measuring angle α. The method of claim 1, The distance (a) from the pivot center point to the body portion withdrawal point of the tape measure 230 and the distance (a) from the pivot center point to the top plate fixing point of the tape measure 230 are formed to be the same. And the measuring angle (α) is formed to be displayed as an angular scale at a position on the tape measure (230) corresponding to the following c value with respect to the fixed side end of the tape measure. [Equation 1] (Where α is the measurement angle or rotation angle, a is the distance from the center of rotation to the point of withdrawing the body of the tape measure) The method of claim 2, The inner surface of the main body portion 200 is provided with an elevation measuring plate 210 capable of selective upright manipulation at a tape measure 230 withdrawal point, When the elevation measuring plate 210 is perpendicular to the inner surface of the main body 200, the tape measure 230 drawn from the main body 200 is bent through the upper end of the elevation measuring plate 210. Is formed to reach the top plate fixing point, The angle measuring angle α of the high angle range is formed so as to be displayed as a high angle scale at a position on the tape measure 230 corresponding to the following d value with respect to the fixed side end of the tape measure. [Equation 2] (Where b is the height of the elevation plate, c is a value obtained by Equation 1, β is a value obtained by the following equation (3); [Equation 3] β = 90-{(180-α) / 2}) The method of claim 2, The inner surface of the main body portion 200 is provided with an elevation measuring plate 210 capable of selective upright manipulation at a tape measure 230 withdrawal point, When the elevation measuring plate 210 is perpendicular to the inner surface of the main body 200, the tape measure 230 drawn from the main body 200 is bent through the upper end of the elevation measuring plate 210. Is formed to reach the top plate fixing point, The angle measuring angle α of the high angle range is formed so as to be displayed as a high-angle scale at a position on the tape measure 230 corresponding to the b + d value with respect to the fixed side end of the tape measure. [Equation 2] (Where b is the height of the elevation plate, c is a value obtained by Equation 1, β is a value obtained by the following equation (3); [Equation 3] β = 90-{(180-α) / 2}) The method according to any one of claims 1 to 4, And a thickness t1 of the upper plate portion and a thickness t2 of the main body portion are formed to have the same value. The method according to any one of claims 1 to 4, The body portion 200 is an angle measuring device, characterized in that the level 282 is installed. The method according to any one of claims 1 to 4, Side of the upper plate portion 100 and the main body portion 200, the angle measuring unit, characterized in that a scale 252 is formed for measuring the length. The method according to any one of claims 1 to 4, Roller measuring the tape measure 230 is an angle measuring device, characterized in that the gripping means for providing a rotational restoring force.