CN202074918U - A single-leg external arc ruler - Google Patents

Abstract

The utility model provides a single-footed outer circular arc chi of designing according to right angled triangle's principle, be provided with the blade, the chi frame, blade locating piece and fastener, the chi frame is provided with blade and body, blade and body fixed connection, contained angle A between body and the blade sets up to 30, the body is provided with the sliding tray, the blade assembles in the sliding tray and slides along the sliding tray, the blade locating piece is connected with the one end of blade, the blade is provided with the main scale, the body is provided with vice chi scale, 0 scale position of main scale sets up in keeping away from body one end of main scale, the zero scale mark position of vice chi is the nodical position of blade and body. The single-foot outer circular arc ruler can detect the radius of a circular arc with a circumferential angle smaller than 180 degrees and the radius of a tall object, and is convenient to operate, simple in structure and low in cost.

Description

A single-leg external arc ruler

technical field

The utility model relates to the field of measuring tools, in particular to a single-leg outer arc ruler.

Background technique

As we all know, there are different measuring tools for measuring the length of objects according to the length of different objects. There are angle rulers for measuring angles, depth rulers for measuring depths, and height rulers for measuring heights. However, there is currently no corresponding measuring tool for measuring the radius of a circular arc with a circumferential angle less than 180° and the radius or diameter of a tall object.

In actual work, for the above situation, the following two methods are generally used: the model method and the measurement and calculation method.

The template method is to make different arc templates according to different arc radii, and use the circular arc template to compare with the circular arc objects whose circumferential angle is less than 180°. Since this method needs to make arc templates, it is only suitable for arc objects with a large number of inspected arc objects and a small radius.

The calculation method of measurement and coordination is to calculate the radius of the arc according to the formula R=(C ² +4h ² )/8h for the calculation of the geometric dimensions of the bow, and then calculate the two dimensions of the chord length (C) and arch height (h) of the object. . For tall objects, only the circumference (L) can be measured, and the arc radius can be calculated according to the pi formula R=L/2π.

Chinese patent application 200810070341.0 discloses a circular diameter ruler. The principle of the circular diameter ruler is that the ruler body is the upper base, and the two feet are the three sides of an isosceles trapezoid with the waist. The angle between the two feet is 60°. A retractable slide rule is arranged in the middle section of the ruler body, and the center line of the slide rule coincides with the vertical bisector of the ruler body. The arc ruler designed according to this principle has the following disadvantages:

1. Due to the interference of the isosceles trapezoid and the ruler body, it cannot measure the arc radius smaller than a certain size; it is inconvenient to use for larger arc radius due to the too large ruler body and weight.

2. The circumference angle of the measured arc body must be greater than 120°, that is, >1/3 circle, and the application range is narrow.

3. The actual arc radius value is equal to the known value of the fixed length and the value of the measured length.

In order to conveniently and quickly detect the radius of the arc whose circumference angle is less than 180° and the radius of tall objects, and expand the use range of the arc ruler, it is necessary to study a single-leg outer arc ruler to solve the shortcomings of the existing technology.

Contents of the invention

The purpose of the utility model is to avoid the deficiencies of the prior art and provide a single-leg outer arc ruler, which can detect the radius of a circular arc whose circumference angle is less than 180° and the radius of a tall object , easy to operate, simple in structure and low in cost.

The purpose of this utility model is achieved through the following technical measures.

A single-leg outer arc ruler of the utility model is provided with a ruler body, a ruler frame and a ruler body positioning block, the ruler frame is provided with a ruler foot and a body, the ruler foot is fixedly connected with the body, the The included angle A between the body and the ruler foot is set to 30° or 45°, the body is provided with a sliding groove, the ruler body is assembled in the sliding groove and slides along the sliding groove, the ruler body The positioning block is connected to one end of the ruler body, the ruler body is provided with a main scale scale, the body is provided with a subscale scale, and the 0 scale position of the main scale is set at the end of the main scale away from the body , the position of the zero scale line of the auxiliary ruler is the intersection point of the ruler foot and the body.

The single-leg arc ruler is provided with a fastening device, and the fastening device is arranged on the body.

The above-mentioned fastening device includes a slotted hole provided on the body and a fastening screw, and the fastened screw is assembled in the slotted hole.

A single-leg outer arc ruler of the utility model is provided with a ruler body, a ruler frame and a ruler body positioning block, the ruler frame is provided with a ruler foot and a body, the ruler foot is fixedly connected with the body, the The included angle A between the body and the ruler foot is set to 30° or 45°, the body is provided with a sliding groove, the ruler body is assembled in the sliding groove and slides along the sliding groove, the ruler body The positioning block is connected to one end of the ruler body, the ruler body is provided with a main scale scale, the body is provided with a subscale scale, and the 0 scale position of the main scale is set at the end of the main scale away from the body , the position of the zero scale line of the auxiliary ruler is the intersection point of the ruler foot and the body. The single-leg external arc ruler can detect the radius of a circular arc whose circumferential angle is less than 180° and the radius of a tall object, and has the advantages of convenient operation, simple structure and low cost.

Description of drawings

Utilize accompanying drawing to further illustrate the utility model, but the content in the accompanying drawing does not constitute any limitation to the utility model.

Fig. 1 is a schematic structural view of Embodiment 1 of a single-leg outer arc ruler of the present invention.

In Figure 1 include:

ruler body 100,

ruler frame 200,

Ruler body positioning block 300,

Foot 210,

Body 220,

sliding groove 221,

Fastening device 400 .

Detailed ways

The utility model is further described in conjunction with the following examples.

Example 1.

A single-leg outer arc ruler, as shown in Figure 1, is provided with a ruler body 100, a ruler frame 200 and a ruler body positioning block 300, the ruler frame 200 is provided with a ruler foot 210 and a body 220, and the ruler foot 210 is fixed to the body 220 connection, the angle A between the body 220 and the foot 210 is set to 30°. The included angle A between the body 220 and the ruler foot 210 is set to 30°, and the reading of the single-leg outer arc ruler can be directly used as the radius of the measured arc object. No other conversion is required, so the operation is convenient and the measurement error is small.

The main body 220 is provided with a sliding groove 221 , the blade body 100 is assembled in the sliding groove 221 and slides along the sliding groove 221 , and the blade body positioning block 300 is connected with one end of the blade body 100 . The effect of the chi body 100 fixed blocks is to make the chi body 100 center line coincide with the center line of the arc object.

The ruler body 100 is provided with a main ruler scale, and the body 220 is provided with an auxiliary ruler scale. intersection location.

The single-leg arc ruler is provided with a fastening device 400 , and the fastening device 400 is disposed on the body 220 . After the measurement is completed, the measurement result can be kept unchanged by the fastening device 400, which is convenient for cooperating with other operations. The fastening device 400 includes a slotted hole disposed on the body 220 and a fastening screw, and the fastened screw is assembled in the slotted hole.

The method of using the single-leg outer arc ruler is as follows: after fitting the end of the ruler body positioning block 300 to a certain section of the measured circular object, push the ruler frame 200 so that the inner side of the ruler frame 200 fits the measured circle Then tighten the fastening screw, take out the outer arc ruler, and read the measured value according to the reading method of the vernier caliper.

The single-leg outer arc ruler of the utility model is designed according to the geometrical principle of circumscribed circles, the angle A between the body 220 and the foot 210 is set to 30°, and the tangent point between the foot 210 and the arc surface is passed. The radius is perpendicular to the ruler foot 210, therefore, the reading of the single-leg external arc ruler is equal to the radius R of the circle. Therefore, the radius of the measured arc body can be directly measured and read by the single-leg outer arc ruler of the utility model.

The single-leg outer arc ruler can detect the radius of an arc with a circumference angle of less than 180° and the radius of a tall object, as long as the ruler body positioning block 300 fits a certain section of the measured arc object, and the ruler frame 200 is pushed to make The inner side of the ruler frame 200 fits the measured arc object, pushes the ruler body 100 to slide to a proper position along the chute, tightens the fastening device 400, and the reading is the radius of the measured arc object.

Using the circumscribed circle geometry principle, set the pinch between the body 220 and the ruler foot 210 to 30°, therefore, the reading of the single-leg outer arc ruler is the radius of the measured arc object, and no other processing or processing is required. Transformation, therefore, can reduce errors, and is simple in structure and low in cost. The way of direct reading is easy to operate.

The single-leg outer arc ruler is designed as a thread pair, and the ruler frame 200 is pushed or retreated by rotating the nut, so that a micrometer with high precision can be made.

Example 2.

An outer arc ruler, the other structure is the same as that of Embodiment 1, the difference is that the angle A between the body 220 and the ruler foot 210 is set to 45°.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should It is understood that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (3)

1. single pin external arc chi, it is characterized in that: be provided with blade, chi frame and blade locating piece, described chi frame is provided with chi pin and body, described chi pin is fixedlyed connected with described body, included angle A between described body and the described chi pin is set to 30 ° or 45 °, described body is provided with sliding tray, described blade is assemblied in described sliding tray and slides along described sliding tray, described blade locating piece is connected with an end of described blade, described blade is provided with the main scale scale, described body is provided with secondary chi scale, 0 scale position of described main scale be arranged at described main scale away from described body one end, the zero graduation line position of described secondary chi is the position of intersecting point of described chi pin and described body.

2. single pin external arc chi according to claim 1, it is characterized in that: be provided with fastener, described fastener is arranged at described body.

3. single pin external arc chi according to claim 2, it is characterized in that: described fastener comprises slotted eye and the trip bolt that is arranged at described body, and described trip bolt is assemblied in described slotted eye.

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