CN102759317A - an outer arc ruler - Google Patents

Abstract

The utility model provides an outer circular arc chi of designing according to right angled triangle's principle, is provided with blade, chi frame and fastener, and the chi frame is provided with first chi foot, second chi foot and body, and first chi foot, second chi foot are respectively in body fixed connection, and contained angle A between first chi foot and the second chi foot sets up to 60 or 90, and the body is provided with the sliding tray, and the blade assembles in the sliding tray and slides along the sliding tray, and the blade is provided with the main scale, and the body is provided with vice chi scale, 0 scale position of main scale set up in the body one end of keeping away from of main scale, the zero scale mark position of vice chi be first chi foot with the nodical position of second chi foot. The outer arc ruler can detect the radius of an arc with a circumference 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

an outer arc ruler

technical field

The invention relates to the field of measuring tools, in particular to an 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 an outer arc ruler to solve the shortcomings of the existing technology.

Contents of the invention

The purpose of the present invention is to avoid the deficiencies of the prior art and provide a kind of outer arc ruler, which can detect the radius of the arc whose circumference angle is less than 180° and the radius of the tall object, which is easy to operate and has a good structure. Simple and low cost.

The object of the present invention is achieved through the following technical measures.

An outer arc ruler of the present invention is provided with a ruler body and a ruler frame, and the ruler frame is provided with a first ruler foot, a second ruler foot and a body, and the first ruler foot and the second ruler foot are respectively Fixedly connected to the body, the angle A between the first foot and the second foot is set to 60° or 90°, the body is provided with a sliding groove, and the body is assembled on the The sliding groove slides along the sliding groove, the ruler body is provided with a main scale scale, the body is provided with a secondary scale scale, 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 first ruler foot and the second ruler foot.

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.

An outer arc ruler of the present invention is provided with a ruler body and a ruler frame, and the ruler frame is provided with a first ruler foot, a second ruler foot and a body, and the first ruler foot and the second ruler foot are respectively Fixedly connected to the body, the angle A between the first foot and the second foot is set to 60° or 90°, the body is provided with a sliding groove, and the body is assembled on the The sliding groove slides along the sliding groove, the ruler body is provided with a main scale scale, the body is provided with a secondary scale scale, 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 first ruler foot and the second ruler foot. The outer arc ruler can detect the radius of a circular arc with a circumferential angle 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

The present invention will be further described by using the accompanying drawings, but the content in the accompanying drawings does not constitute any limitation to the present invention.

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

In Figure 1 include:

ruler body 100,

ruler frame 200,

The first feet 210,

The second foot 220

Body 230,

sliding groove 231,

Fastening device 300. the

Detailed ways

The present invention is further described in conjunction with the following examples.

Example 1.

A kind of outer arc ruler, as shown in Figure 1, is provided with chi body 100, chi frame 200, and chi frame 200 is provided with first chi foot 210, the second chi foot 220 and body 230, the first chi foot 210, the second chi foot The two feet 220 are fixedly connected to the body 230 respectively, and the angle A between the first foot 210 and the second foot 220 is set to 60°. The angle A between the first foot 210 and the second foot 220 is set to 60°, and the reading of the 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 230 is provided with a sliding groove 231, the ruler body 100 is assembled in the sliding groove 231 and slides along the sliding groove 231, the ruler body 100 is provided with a main scale scale, the main body 230 is provided with a subscale scale, and the 0 scale position of the main scale is set on the main scale At the end far away from the main body 230 , the position of the zero scale line of the auxiliary ruler is the intersection of the first ruler foot 210 and the second ruler foot 220 .

The outer arc ruler is provided with a fastening device 300 , and the fastening device 300 is disposed on the body 230 . After the measurement is completed, the measurement result can be kept unchanged by the fastening device 300, which is convenient for other operations. The fastening device 300 includes a slotted hole disposed on the body 230 and a fastening screw, and the fastened screw is assembled in the slotted hole.

The method of use of this outer arc ruler is as follows: after the first chi foot 210 and the second chi foot 220 of the chi frame 200 are respectively combined with a certain section of the arc object to be measured, the chi body 100 is pushed to make the chi body 1000 The scale end is attached to the surface of the measured object, 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.

Outer arc ruler of the present invention, its design is according to circumscribed circle geometry principle, the included angle A between the first chi foot 210 and the second chi foot 220 is set to 60 °, passes first, second chi foot 220 and The radii of the tangent points of the arc surface are respectively perpendicular to the first foot 210 and the second foot 220 , therefore, the reading of the outer arc ruler is equal to the radius R of the circle. Therefore, through the outer arc ruler of the present invention, the radius of the measured arc body can be directly measured and read.

The outer arc ruler can detect the radius of an arc with a circumferential angle less than 180° and the radius of a tall object, as long as the first foot 210 and the second foot 220 are respectively attached to a certain section of the measured arc object, Push the ruler body 100 to slide to a proper position along the chute, tighten the fastening device 300, and the reading is the radius of the measured circular object.

Utilize the geometric principle of circumscribed circle, set the pinch between the first foot 210 and the second foot 220 to 60°, therefore, the reading of the outer arc ruler is the radius of the measured arc object, no need to go through Other processing or conversion, therefore, can reduce the error, and the structure is simple and the cost is low. The way of direct reading is easy to operate.

The outer arc ruler is designed as a thread pair, and the rotating nut pushes or retreats the ruler frame 200, so that a micrometer with high precision can be made.

Example 2.

An outer arc ruler, the other structures are the same as those in Embodiment 1, except that the angle A between the first ruler foot 210 and the second ruler foot 220 is set to 90°.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that Modifications or equivalent replacements are made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (3)

1. a kind of outer arc ruler, it is characterized in that: be provided with chi body, chi frame, described chi frame is provided with first chi foot, second chi foot and body, described first chi foot, described second chi foot The ruler feet are respectively fixedly connected to the body, the angle A between the first ruler foot and the second ruler foot is set to 60° or 90°, the body is provided with a sliding groove, and the ruler body is assembled Sliding in and along the sliding groove, the body is provided with a main scale scale, and the body is provided with a subscale scale, and the 0 scale position of the main scale is set on the side of the main scale far away from the At one end of the main body, the position of the zero scale line of the auxiliary ruler is the intersection point of the first ruler foot and the second ruler foot. 2. The outer arc ruler according to claim 1, characterized in that: a fastening device is provided, and the fastening device is arranged on the body. 3. The outer arc ruler according to claim 2, wherein the fastening device comprises a slotted hole and a fastening screw arranged on the body, and the fastening screw is assembled in the slotted hole.

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