CN102759318B - Single-leg external circular arc ruler - Google Patents

Single-leg external circular arc ruler Download PDF

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Publication number
CN102759318B
CN102759318B CN201110111028.9A CN201110111028A CN102759318B CN 102759318 B CN102759318 B CN 102759318B CN 201110111028 A CN201110111028 A CN 201110111028A CN 102759318 B CN102759318 B CN 102759318B
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China
Prior art keywords
ruler
chi
pin
main
blade
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CN201110111028.9A
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Chinese (zh)
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CN102759318A (en
Inventor
夏义训
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DONGGUAN SHINI ELECTROTHERMAL MACHINERY Co Ltd
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DONGGUAN SHINI ELECTROTHERMAL MACHINERY Co Ltd
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Priority to CN201110111028.9A priority Critical patent/CN102759318B/en
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Abstract

The invention discloses a single-leg external circular arc ruler which is designed according to the principle of a right-angled triangle. The single-leg external circular arc ruler is provided with a ruler body, a ruler frame, a ruler body positioning block and a fastening device, wherein the ruler frame is provided with a ruler leg and a main body which are fixedly connected, an included angle A between the main body and the ruler leg is 30 degrees, the main body is provided with a chute, the ruler body is assembled in the chute and slides along the chute, the ruler body positioning block is connected with one end of the ruler body which is provided with main ruler scales, the main body is provided with auxiliary ruler scales, a zero scale of a main ruler is arranged at one end of the main ruler far away from the main body, and a zero granulated line of the auxiliary is located at an intersection point between the ruler leg and the main body. The single-leg external circular arc ruler can be used for detecting the radius of an arc with the circumference angle being smaller than 180 degrees and the radius of large object, and is convenient to operate, simple in structure and low in cost.

Description

A kind of single pin external circular-arc rule
Technical field
The present invention relates to survey instrument field, particularly relate to a kind of single pin external circular-arc rule.
Background technology
As everyone knows, carry out the measurement of object length according to the length of different objects, there is different survey instruments, taken measurement of an angle bevel protractor, and fathomed pit gauge, and measuring height has height gauge.But, measure angle of circumference when being less than the radius of the circular arc of 180 ° and tall and big object radius or diameter, there is no corresponding survey instrument at present.
In real work, for above-mentioned situation, general employing two kinds of methods below: template method and measurement coordinate computing method.
Template method is the model making different circular arc according to different arc radius, and the circular arc object being less than 180 ° with radius gauge and angle of circumference compares.This method makes radius gauge, so only adapt to be verified the less circular arc object of the many and radius size of circular arc object quantity due to needs.
Measure and coordinate computing method to be according to arc physical dimension computing formula R=(C 2+ 4h 2)/8h calculates arc radius, and chord length (C) and sagitta (h) two dimensional values of measuring object calculate again.To tall and big object, just can only measure circumference (L) dimensional values, calculate arc radius according to circular constant formula R=L/2 π.
Chinese patent application 200810070341.0 discloses a kind of diameter chi, the principle of this diameter chi take blade as upper base, two chi pin are three limits of the isosceles trapezoid of waist, the angle of two chi pin is 60 °, blade stage casing is provided with telescopic slide rule, and slide rule center line overlaps with the perpendicular bisector of blade.Following shortcoming is there is according to the dial scale of this principle design:
1., owing to being isosceles trapezoid, the interference of blade, can not measure the arc radius being less than certain size; To larger arc radius because blade is too large and the inconvenient use of weight reasons.
2. the angle of circumference of pair measured circular arc body is greater than 120 °, i.e. > 1/3 circle, and range of application is narrower.
3. actual arc radius value equals regular length known numeric value and measures length value composition.
Conveniently fast detect that angle of circumference is less than the radius of the circular arc of 180 ° and tall and big object radius, expand the usable range of dial scale simultaneously, study a kind of single pin external circular-arc rule very necessary to solve prior art deficiency.
Summary of the invention
The object of the invention is to avoid the deficiencies in the prior art part and provide a kind of single pin external circular-arc rule, this single pin external circular-arc rule can detect that angle of circumference is less than the radius of the circular arc of 180 ° and tall and big object radius, easy to operate, and structure is simple, with low cost.
Object of the present invention is realized by following technical measures.
The single pin external circular-arc rule of one of the present invention, be provided with blade, chi frame and blade locating piece, described chi frame is provided with chi pin and body, described chi pin is fixedly connected with described body, included angle A between described body and 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 one end of described blade, described blade is provided with main scale scale, described body is provided with secondary chi scale, 0 graduation 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.
Above-mentioned single pin dial scale is provided with fastener, and described fastener is arranged at described body.
Above-mentioned fastener comprises the slotted eye and trip bolt that are arranged at described body, and described trip bolt is assemblied in described slotted eye.
The single pin external circular-arc rule of one of the present invention, be provided with blade, chi frame and blade locating piece, described chi frame is provided with chi pin and body, described chi pin is fixedly connected with described body, included angle A between described body and 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 one end of described blade, described blade is provided with main scale scale, described body is provided with secondary chi scale, 0 graduation 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.This single pin external circular-arc rule can detect that angle of circumference is less than the radius of the circular arc of 180 ° and tall and big object radius, easy to operate, and structure is simple, with low cost.
Accompanying drawing explanation
The present invention is further illustrated to utilize accompanying drawing, but the content in accompanying drawing does not form any limitation of the invention.
Fig. 1 is the structural representation of a kind of single pin external circular-arc rule embodiment 1 of the present invention.
Comprise in FIG:
Blade 100,
Chi frame 200,
Blade locating piece 300,
Chi pin 210,
Body 220,
Sliding tray 221,
Fastener 400.
Embodiment
The invention will be further described with the following Examples.
embodiment 1.
A kind of single pin external circular-arc rule, as shown in Figure 1, be provided with blade 100, chi frame 200 and blade locating piece 300, chi frame 200 is provided with chi pin 210 and body 220, and chi pin 210 is fixedly connected with body 220, and the included angle A between body 220 and chi pin 210 is set to 30 °.Included angle A between body 220 and chi pin 210 is set to 30 °, directly can pass through the radius of reading as surveyed circular arc object of this single pin external circular-arc rule.Do not need through other conversion, therefore, easy to operate, measuring error is less.
Body 220 is provided with sliding tray 221, and blade 100 is assemblied in sliding tray 221 and slides along sliding tray 221, and blade locating piece 300 is connected with one end of blade 100.The effect of blade 100 fixed block is that blade 100 center line is overlapped with the center of circle center line of circular arc object.
Blade 100 is provided with main scale scale, and body 220 is provided with secondary chi scale, 0 graduation position of main scale be arranged at main scale away from described body 220 one end, the zero graduation line position of secondary chi is chi pin 210 and the position of intersecting point of body 220.
This single pin dial scale is provided with fastener 400, and fastener 400 is arranged at body 220.After measurement, measurement result can be remained unchanged by fastener 400, other operation of convenient cooperation.Fastener 400 comprises the slotted eye and trip bolt that are arranged at body 220, and trip bolt is assemblied in slotted eye.
This single pin external circular-arc rule, its using method is such, behind a certain cross section of blade locating piece 300 end laminating measured circular arc object, promoting chi frame 200 makes chi frame 200 with inner side laminating measured circular arc object, then trip bolt is tightened, take out external circular-arc rule, read measured value according to the number reading method of vernier caliper.
Single pin external circular-arc rule of the present invention, its design is according to circumcircle geometrical principle, and the included angle A between body 220 and chi pin 210 is set to 30 °, crosses chi pin 210 vertical with chi pin 210 with the radius at the point of contact of arc surface, therefore, the reading of this single pin external circular-arc rule equals radius of a circle R.Therefore, by single pin external circular-arc rule of the present invention, the radius reading measured circular arc body directly can be measured.
This single pin external circular-arc rule can detect that angle of circumference is less than the radius of the circular arc of 180 ° and tall and big object radius, the a certain cross section of measured circular arc object as long as blade locating piece 300 is fitted, promote chi frame 200 and make to fit inside chi frame 200 measured circular arc object, promote blade 100 along slide to correct position, tighten fastener 400, reading is the radius of measured circular arc object.
Utilize circumcircle geometrical principle, the pinch arranged between body 220 and chi pin 210 is 30 °, therefore, the reading of this single pin external circular-arc rule is the radius of measured circular arc object, does not need through other process or transforms, therefore, can reduce error, and structure is simple, with low cost.Direct reading mode, easy and simple to handle.
This single pin external circular-arc rule is designed to screw thread pair, and chi frame 200 advances or retreats by rotating nut, can make the milscale that precision is higher.
embodiment 2.
A kind of external circular-arc rule, other structures are identical with embodiment 1, and difference is, the included angle A between body 220 and chi pin 210 is set to 45 °.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.

Claims (3)

1. a single pin external circular-arc rule, 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 fixedly connected with described body, included angle A between described body and described chi pin is set to 30 ° or 45 °, described chi pin is set to single chi pin, 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 one end of described blade, described blade is provided with main scale scale, described body is provided with secondary chi scale, 0 graduation 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 circular-arc rule according to claim 1, it is characterized in that: be provided with fastener, described fastener is arranged at described body.
3. single pin external circular-arc rule according to claim 2, is characterized in that: described fastener comprises the slotted eye and trip bolt that are arranged at described body, and described trip bolt is assemblied in described slotted eye.
CN201110111028.9A 2011-04-29 2011-04-29 Single-leg external circular arc ruler Active CN102759318B (en)

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CN102759318B true CN102759318B (en) 2015-03-04

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111307021B (en) * 2020-03-03 2021-06-04 浙江中技建设工程检测有限公司 Diameter measuring device for outer wall of cambered surface structure and using method thereof
CN112179249A (en) * 2020-09-29 2021-01-05 安徽江淮汽车集团股份有限公司 Gap measuring device

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN86200469U (en) * 1986-01-29 1986-10-01 西安交通大学 Inverted y-type vernier
CN2047777U (en) * 1989-05-24 1989-11-15 贺建成 Forked radius-measuring instrument for cylinder
CN2708240Y (en) * 2004-05-25 2005-07-06 广东省高级技工学校 An arc radius measuring instrument
CN202074918U (en) * 2011-04-29 2011-12-14 东莞信易电热机械有限公司 One-foot external circular arch rule

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Publication number Priority date Publication date Assignee Title
JPH08285504A (en) * 1995-04-14 1996-11-01 Toshiba Chem Corp Outside diameter measuring device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86200469U (en) * 1986-01-29 1986-10-01 西安交通大学 Inverted y-type vernier
CN2047777U (en) * 1989-05-24 1989-11-15 贺建成 Forked radius-measuring instrument for cylinder
CN2708240Y (en) * 2004-05-25 2005-07-06 广东省高级技工学校 An arc radius measuring instrument
CN202074918U (en) * 2011-04-29 2011-12-14 东莞信易电热机械有限公司 One-foot external circular arch rule

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
非完整圆弧半径测量方法综述;孟苏飞等;《机械管理开发》;20061231(第6期);第51-52页,第54页 *

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