CN202074918U - One-foot external circular arch rule - Google Patents
One-foot external circular arch rule Download PDFInfo
- Publication number
- CN202074918U CN202074918U CN201120134045XU CN201120134045U CN202074918U CN 202074918 U CN202074918 U CN 202074918U CN 201120134045X U CN201120134045X U CN 201120134045XU CN 201120134045 U CN201120134045 U CN 201120134045U CN 202074918 U CN202074918 U CN 202074918U
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- Prior art keywords
- rule
- chi
- blade
- pin
- foot
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Abstract
A one-foot external circular arch rule designed according to the principle of a right angled triangle is provided with a rule body, a rule frame, a rule body positioning block and a fastening device, wherein the rule frame is provided with a rule foot and a body, the rule foot is fixedly connected with the body, an included angle A between the body and the rule foot is set to be 30 degrees, the body is provided with a sliding groove, the rule body is arranged in the sliding groove and can slide along the sliding groove, the rule body positioning block is connected with one end of the rule body, main scale graduations are marked on the rule body, auxiliary scale graduations are marked on the body, the zero graduation position of the main rule is arranged at one end of the main rule, far away from the body, and the zero graduation line position of the auxiliary rule is the intersection point position of the rule foot and the body. The one-foot external circular arch rule can detect the radius of circular arcs with circumferential angle less than 180 degrees and the radius of high objects, and is convenient in operation, simple in structure and low in cost.
Description
Technical field
The utility model relates to the survey instrument field, particularly relates to a kind of single pin external arc chi.
Background technology
As everyone knows, carry out the measurement of object length, have different survey instruments according to the length of different objects, the bevel protractor that taken measurement of an angle, the pit gauge that fathomed, measuring height has height gauge.But, when measuring angle of circumference, do not have corresponding survey instrument at present less than the radius of 180 ° circular arc and tall and big object radius or diameter.
In real work, for above-mentioned situation, generally adopt following two kinds of methods: template method and measurement cooperate computing method.
Template method is to make the model of different circular arcs according to different arc radius, compares with radius gauge and the angle of circumference circular arc object less than 180 °.This method is verified the many and less circular arc object of radius size of circular arc object quantity owing to need to make radius gauge so only adapt to.
Measuring the cooperation computing method is according to arc geometric size calculation formula R=(C
2+ 4h
2)/8h calculates arc radius, and chord length (C) and two size numerical value of sagitta (h) of measuring object calculate again.To tall and big object, just can only measure circumference (L) size numerical value, calculate arc radius according to circular constant formula R=L/2 π.
Chinese patent application 200810070341.0 discloses a kind of circle footpath chi, the principle of this circle footpath chi is to be upper base with the blade, two chi pin are three limits of the isosceles trapezoid of waist, the angle of two chi pin is 60 °, the blade stage casing is provided with telescopic slide rule, and the slide rule center line overlaps with the perpendicular bisector of blade.There is following shortcoming in dial scale according to this principle design:
1. owing to be isosceles trapezoid, the interference of blade is to less than the arc radius of certain size energy measurement not; To bigger arc radius because of blade too big and weight reason be inconvenient to use.
2. the angle of circumference to measured circular arc body is greater than 120 °, and promptly＞1/3 round, range of application is narrower.
3. actual arc radius value equals the regular length known numeric value and measures length numerical value and form.
For convenience fast detect angle of circumference less than the radius of 180 ° circular arc and tall and big object radius, enlarge the usable range of dial scale simultaneously, it is very necessary to solve the prior art deficiency to study a kind of single pin external arc chi.
Summary of the invention
The purpose of this utility model is to avoid the deficiencies in the prior art part and a kind of single pin external arc chi is provided, this list pin external arc chi can detect angle of circumference less than the radius of 180 ° circular arc and tall and big object radius, easy to operate, simple in structure, with low cost.
The purpose of this utility model realizes by following technical measures.
A kind of single pin external arc chi of the present utility model, 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.
Above-mentioned single pin dial scale is provided with fastener, and described fastener is arranged at described body.
Above-mentioned fastener comprises slotted eye and the trip bolt that is arranged at described body, and described trip bolt is assemblied in described slotted eye.
A kind of single pin external arc chi of the present utility model, 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.This list pin external arc chi can detect angle of circumference less than the radius of 180 ° circular arc and tall and big object radius, and is easy to operate, simple in structure, with low cost.
Description of drawings
Utilize accompanying drawing that the utility model is further described, but the content in the accompanying drawing does not constitute any restriction of the present utility model.
Fig. 1 is the structural representation of a kind of single pin external arc chi embodiment 1 of the utility model.
In Fig. 1, comprise:
Chi frame 200,
Blade locating piece 300,
Sliding tray 221,
Fastener 400.
Embodiment
With the following Examples the utility model is further described.
Embodiment 1.
A kind of single pin external arc chi as shown in Figure 1, is provided with blade 100, chi frame 200 and blade locating piece 300, and chi frame 200 is provided with chi pin 210 and body 220, and chi pin 210 is fixedlyed connected with body 220, and the included angle A between body 220 and the chi pin 210 is set to 30 °.Included angle A between body 220 and the chi pin 210 is set to 30 °, can directly pass through the radius of the reading of this list pin external arc chi as survey circular arc object.Do not need through other conversion, therefore easy to operate, measuring error is less.
This list pin dial scale is provided with fastener 400, and fastener 400 is arranged at body 220.After measurement finishes, can make measurement result remain unchanged by fastener 400, convenient other operation of cooperation.Fastener 400 comprises slotted eye and the trip bolt that is arranged at body 220, and trip bolt is assemblied in slotted eye.
This list pin external arc chi, its using method is such, behind a certain cross section with blade locating piece 300 end applying measured circular arc objects, promoting chi frame 200 makes chi frame 200 get final product with inboard applying measured circular arc object, tighten trip bolt then, take out the external arc chi, read measured value according to the number reading method of vernier caliper.
Single pin external arc chi of the present utility model, its design is according to the circumcircle geometrical principle, and the included angle A between body 220 and the chi pin 210 is set to 30 °, and it is vertical with chi pin 210 with the radius at the point of contact of arc surface to cross chi pin 210, therefore, the reading of this list pin external arc chi equals radius of a circle R.Therefore, by single pin external arc chi of the present utility model, can directly measure the radius of reading the measured circular arc body.
This list pin external arc chi can detect angle of circumference less than the radius of 180 ° circular arc and tall and big object radius, as long as a certain cross section with blade locating piece 300 applying measured circular arc objects, promote chi frame 200 and make chi frame 200 inboard applying measured circular arc objects, promote blade 100 and slide into correct position along chute, tighten fastener 400, reading is the radius of measured circular arc object.
Utilize the circumcircle geometrical principle, the pinch that is provided with between body 220 and the chi pin 210 is 30 °, therefore, the reading of this list pin external arc chi is the radius of measured circular arc object, does not need through other processing or conversion, therefore, can reduce error, and simple in structure, with low cost.Direct reading mode, easy and simple to handle.
Should be designed to screw thread pair by list pin external arc chi, the rotation nut advances chi frame 200 or retreats, and can make the higher milscale of precision.
Embodiment 2.
A kind of external arc chi, other structures are identical with embodiment 1, and difference is that the included angle A between body 220 and the chi pin 210 is set to 45 °.
Should be noted that at last; above embodiment is only in order to the explanation the technical solution of the utility model but not to the restriction of the utility model protection domain; although the utility model has been done detailed description with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the essence and the scope of technical solutions 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120134045XU CN202074918U (en) | 2011-04-29 | 2011-04-29 | One-foot external circular arch rule |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120134045XU CN202074918U (en) | 2011-04-29 | 2011-04-29 | One-foot external circular arch rule |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202074918U true CN202074918U (en) | 2011-12-14 |
Family
ID=45113018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120134045XU Expired - Fee Related CN202074918U (en) | 2011-04-29 | 2011-04-29 | One-foot external circular arch rule |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202074918U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759318A (en) * | 2011-04-29 | 2012-10-31 | 东莞信易电热机械有限公司 | Single-leg external circular arc ruler |
-
2011
- 2011-04-29 CN CN201120134045XU patent/CN202074918U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759318A (en) * | 2011-04-29 | 2012-10-31 | 东莞信易电热机械有限公司 | Single-leg external circular arc ruler |
| CN102759318B (en) * | 2011-04-29 | 2015-03-04 | 东莞信易电热机械有限公司 | Single-leg external circular arc ruler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111214 Termination date: 20160429 |