Portable multipurpose subdivision graduation protractor

Abstract

A portable multipurpose subdivision graduation protractor comprises a main ruler, an auxiliary ruler and a precise hinge shaft unit. The main ruler is of a structure similar to a right triangle, two right-angle sides are main ruler arms, a bevel edge is replaced by a 135-degree fold line, and 45-degree, 135-degree and 90-degree external angles are provided and can be directly used as a fixed angle sample plate; the surface of the main ruler is provided with easily-identified fan-shaped distribution scales which are correspondingly arranged in two layers as difference reference lines; parallel step notches are formed in the upper edge of the vertical main ruler arm and are used for small-angle measurement; the auxiliary ruler is of a two-right-angle-side structure, the vertical side is an auxiliary ruler arm, and the auxiliary ruler can also be used as a fixed-angle sample plate. The horizontal side is a pointer arm, the end portion is of a fan-shaped structure, the radius is the same as that of the fan shape of the main ruler, and ruler reading visual errors can be reduced. Various interior angles can be widely measured and mapped, difference group scribed lines are effectively set, and an error conduction chain is shortened due to the fact that the whole ruler is not provided with redundant components. The precision machining problem is solved, and the measurement precision can be further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, in particular to a portable multi-purpose subdivided scale protractor. Background Art

[0002] In general machining processes such as on-site surveying and mapping, fine binding production, sheet metal cutting and folding, and stretch forming, we often encounter issues with the internal and external angles of engineering structures and product components. Some existing angle rulers are too complicated and inconvenient to operate, while others, while simple to use, cannot accurately read values ​​below 1°. Furthermore, due to wide arms and large hinges, measuring smaller internal and external angles is difficult. Utility Model Content

[0003] In view of the above technical deficiencies, the purpose of the present invention is to provide a novel portable multi-purpose subdivided scale protractor.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The basic structure is assembled from a right-angled triangle main ruler, two right-angled side rulers, a precision screw tail hinge shaft, a gasket and a hand-screwed blind hole nut.

[0006] The main scale structure is a quasi-right triangle. The two right-angled sides are both main scale arms. The hypotenuse is replaced by a 135° broken line, providing 45°, 135°, and 90° external angles, which can be used directly as a fixed-angle template. There is a precision hinge shaft hole in the right-angle area of ​​the main scale for fixing the precision screw tail hinge shaft. There are easily recognizable fan-shaped distribution scales on the surface of the main scale, with each small grid being 1°. 0°--90° and 90°--180° are arranged in two corresponding layers. Two small grids are added at each end of the fan as difference reference lines. There are parallel step notches on the upper side of the vertical main scale arm for small angle measurement;

[0007] The outer contours of the main scale and auxiliary scale can be used as templates for fixed angles of 30°, 45°, 90°, and 135°. The upper side of the vertical main scale arm is provided with parallel step notches for small angle measurement. The end of the auxiliary scale pointer arm is a fan-shaped structure, which can reduce visual errors in reading the scale.

[0008] The secondary ruler has two right-angled sides. The vertical side is the secondary ruler arm, with a 30° external angle at the top, which can also be used as a fixed-angle template. The horizontal side is the pointer arm, with a width of ≤8mm. The end is a fan-shaped structure with the same radius as the main ruler fan, which can reduce visual errors in reading the ruler. The pointer 0 line is on the center line of the pointer arm. There are three small grids above and below the pointer 0 line, each small grid ≤5 / 6° (50'). The scale markings use differential values, which are 10', 20', and 30' lines respectively. There is a precision hinge shaft hole in the right-angle area of ​​the secondary ruler, which is installed with the precision screw tail hinge shaft;

[0009] The function of the portable multi-purpose subdivided scale protractor described in the utility model is focused on the very narrow pointer arm, which is effectively set into differential group scale lines, combined with the attached Figure 2 、 3 , 4 detailed reflection, realize the subdivision of "degree" and read "score" with evidence.

[0010] Advantages of this utility model:

[0011] This portable, multi-purpose, finely graduated protractor can be used to measure and map various interior angles from 90° to 180° with a reading accuracy of 10°, and various exterior angles from 0° to 90° with a reading accuracy of 10°. Although its pointer arm is narrow, it effectively forms differential markings. Since the entire ruler has no redundant components, the error transmission chain is shortened. This solves the problem of precision machining and further improves measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0013] Figure 1 This is a schematic diagram of the structure of a portable multi-purpose subdivided scale protractor;

[0014] Figure 2 This is a schematic diagram of measurement example 1;

[0015] Figure 3 This is a schematic diagram of measurement example 2;

[0016] Figure 4 This is a schematic diagram of measurement example three;

[0017] Attachment Figure 1 In the middle, the serial number name: 1. Main scale, 2. Auxiliary scale, 3. Main scale sector distribution scale, 4. Auxiliary scale sector distribution difference group scale, 5. Precision screw tail hinge shaft, 6. Gasket, 7. Hand-screw blind hole nut;

[0018] Attachment Figure 2 , Measurement Example 1: Internal angle 170°, external angle 80°, the secondary ruler's datum 0 line is aligned with the external angle 80° (internal angle 170°) scale line, and the other difference lines are staggered, then the measured value is external angle 80° (internal angle 170°);

[0019] Attachment Figure 3 , Measurement Example 2: Internal angle 122°9'59", external angle 32°9'59";

[0020] The secondary ruler datum 0 line alignment value is slightly greater than 122°

[0021] There is a 10' line aligned above the 0 line of the secondary ruler, so the measurement value is 122°10'

[0022] The actual precision value in this example is 122°9'59", with an error of 1".

[0023] Attachment Figure 4 , Measurement Example 3: Internal angle 90°36', external angle 36'

[0024] The secondary scale datum 0 line alignment value is greater than 1 / 2° (30');

[0025] There are no alignment lines at 10', 20', and 30' above the secondary ruler's datum line 0, but the 30' line approaches the alignment line. If the 40' line is closer to the alignment line, then (30' + 40') / 2 = 35' can be used as the readout value.

[0026] In this example, the actual precision value is 36', so the error is 1'. DETAILED DESCRIPTION

[0027] Example

[0028] The basic structure is assembled from a right-angled triangle main ruler, two right-angled side rulers, a precision screw tail hinge shaft, a gasket and a hand-screwed blind hole nut.

[0029] The main scale structure is a right triangle, with two right-angled sides being the main scale arms, and the hypotenuse being 135°

[0030] Instead of a broken line, it provides 45°, 135°, and 90° external angles and can be used directly as a fixed angle template. There is a precision hinge shaft hole in the right-angle area of ​​the main scale for fixing the precision screw tail hinge shaft. The main scale surface has easily recognizable fan-shaped distribution scales, with each small grid being 1°. 0°--90° and 90°--180° are arranged in two corresponding layers. Two small grids are added at each end of the fan as difference reference lines. A parallel step notch is opened on the upper side of the vertical main scale arm for small angle measurement;

[0031] The outer contours of the main scale and auxiliary scale can be used as templates for fixed angles of 30°, 45°, 90°, and 135°. The upper side of the vertical main scale arm is provided with parallel step notches for small angle measurement. The end of the auxiliary scale pointer arm is a fan-shaped structure, which can reduce visual errors in reading the scale.

[0032] The secondary ruler has two right-angled sides. The vertical side is the secondary ruler arm, with a 30° external angle at the top, which can also be used as a fixed-angle template. The horizontal side is the pointer arm, with a width of ≤8mm. The end is a fan-shaped structure with the same radius as the main ruler fan, which can reduce visual errors in reading the ruler. The pointer 0 line is on the center line of the pointer arm. There are three small grids above and below the pointer 0 line, each small grid ≤5 / 6° (50'). The scale markings use differential values, which are 10', 20', and 30' lines respectively. There is a precision hinge shaft hole in the right-angle area of ​​the secondary ruler, which is installed with the precision screw tail hinge shaft;

[0033] Attachment Figure 2In measurement example 1, the internal angle is 170° and the external angle is 80°. The 0-line of the secondary ruler is aligned with the 80° external angle (170° internal angle) scale line, and the other difference lines are staggered. The measured value is 80° external angle (170° internal angle).

[0034] Attachment Figure 3 In the measurement example 2, the interior angle is 122°9'59", and the exterior angle is 32°9'59";

[0035] The secondary ruler datum 0 line alignment value is slightly greater than 122°

[0036] There is a 10' line aligned above the 0 line of the secondary ruler, so the measurement value is 122°10'

[0037] The actual precision value in this example is 122°9'59", with an error of 1".

[0038] Attachment Figure 4 Measurement Example 3: Internal angle 90°36', external angle 36'

[0039] The secondary scale datum 0 line alignment value is greater than 1 / 2° (30');

[0040] There are no alignment lines at 10', 20', and 30' above the secondary ruler's datum line 0, but the 30' line approaches the alignment line. If the 40' line is closer to the alignment line, then (30' + 40') / 2 = 35' can be used as the readout value.

[0041] In this example, the actual precision value is 36', so the error is 1'.

[0042] The function of the portable multi-purpose subdivided scale protractor is focused on the very narrow pointer arm, which is effectively set into differential group scale lines, combined with the attached Figure 2 、 3 , 4 detailed reflection, realize the subdivision of "degree" and read "score" with evidence.

Claims

1. A portable multi-purpose protractor with subdivided scale, characterized by: It includes a main scale, a secondary scale, and a precision hinge shaft unit; the main scale and secondary scale are connected by a precision hinge shaft and can rotate relative to each other; the main scale structure is a right-angled triangle structure, with the two right-angled sides being the main scale arms, and the hypotenuse being replaced by a 135° broken line, providing 45°, 135°, and 90° external angles, and can be used directly as a fixed-angle template; The main scale surface has easily recognizable sector-shaped distribution scales, with each small grid being 1°; 0°--90° and 90°--180° are arranged in two corresponding layers, with 2 small grids added at each end of the sector as difference reference lines. A parallel step notch is opened on the upper side of the vertical main scale arm for small angle measurement.

2. The portable multi-purpose subdivided scale protractor according to claim 1, characterized in that: The auxiliary ruler has two right-angled sides, the vertical side is the auxiliary ruler arm, and the top angle is 30 degrees, which can also be used as a fixed angle template; The horizontal edge is the pointer arm, with a width of ≤8mm, and the end is a fan-shaped structure with the same radius as the main scale sector, which can reduce the visual error of reading the scale; The pointer 0 line is on the center line of the pointer arm. There are three small grids above and below the pointer 0 line, each small grid is ≤50', and the scale mark uses the difference, which are 10', 20', and 30' lines respectively.

3. The portable multi-purpose subdivided scale protractor according to claim 2, characterized in that: The outer contours of the main scale and auxiliary scale can be used as templates for fixed angles of 30°, 45°, 90°, and 135°. The upper side of the vertical main scale arm is provided with parallel step notches for small angle measurement. The end of the auxiliary scale pointer arm is a fan-shaped structure, which can reduce visual errors in reading the scale.

Images