CN212482444U - Digital display angle ruler - Google Patents
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- CN212482444U CN212482444U CN202021696377.2U CN202021696377U CN212482444U CN 212482444 U CN212482444 U CN 212482444U CN 202021696377 U CN202021696377 U CN 202021696377U CN 212482444 U CN212482444 U CN 212482444U
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Abstract
The application relates to the technical field of measurement, in particular to a digital display angle ruler, which comprises a digital display assembly, a rotary table, a ruler frame, a main grid and an auxiliary grid; the turntable is connected with the auxiliary grid, the ruler frame is connected with the main grid, and the turntable is rotationally connected with the ruler frame; the secondary grid is provided with a pulse transmitter and a pulse receiver; the pulse transmitter is used for continuously transmitting a pulse signal to the main grid; the pulse receiver is used for receiving the pulse signal reflected back from the main grating and transmitting the reflected pulse signal to the digital display component; the digital display assembly is used for comparing and calculating the reflected pulse signals with the initial pulse signals when the main grid and the auxiliary grid are relatively static to obtain the variation of the pulse signals, calculating the relative rotation angle between the main grid and the auxiliary grid through the variation of the pulse signals and displaying the calculated data on a display screen of the digital display assembly. The method has the advantages of being simple in operation, small in error and high in measurement accuracy, and the technical problem that reading errors are large and measurement accuracy is low in the prior art is effectively solved.
Description
Technical Field
The application relates to the technical field of measurement, in particular to a digital display angle ruler.
Background
At present, many angle rulers frequently used by people determine the angle value of an object to be measured by observing angle scale marks on a measuring plate and a ruler frame, and the reading is very inconvenient; and through the mode of artifical reading, reading error often is great, leads to the measurement accuracy of angle square lower easily.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application aims to provide a digital display angle ruler, which effectively solves the technical problem in the prior art that the measurement accuracy is low due to large reading error.
In order to achieve the purpose, the application provides the following technical scheme:
a digital display angle ruler comprises a digital display component, a rotary table, a ruler frame, a main grid and an auxiliary grid;
grids uniformly arranged along the circumference are arranged on the main grid and the auxiliary grid;
the turntable is connected with the auxiliary grid, the ruler frame is connected with the main grid, the turntable is rotationally connected with the ruler frame, and the main grid and the auxiliary grid are arranged relatively close to each other;
the auxiliary grid is provided with a pulse emitter and a pulse receiver, the digital display assembly is connected with the turntable, and the digital display assembly is connected with the pulse receiver;
the pulse emitter is used for continuously emitting pulse signals to the main grid;
the pulse receiver is used for receiving the pulse signals reflected back from the main grating and transmitting the reflected pulse signals to the digital display assembly;
the digital display assembly is used for obtaining the variation of the pulse signals through comparing and calculating the reflected pulse signals with the initial pulse signals when the main grid and the auxiliary grid are relatively static, calculating the relative rotation angle of the main grid through the variation of the pulse signals and displaying the calculated data on a display screen of the digital display assembly.
Preferably, in the above digital display angle ruler, a ruler is further included;
the rotary table is provided with a sliding groove, the ruler is slidably mounted in the sliding groove, and the sliding direction of the ruler is parallel to the diameter direction of the rotary table.
Preferably, in the above digital display angle ruler, a locking pull rod is further included;
a clamping groove is formed in the middle of the ruler, and a clamping block matched with the clamping groove is arranged on the locking pull rod;
the turntable is provided with a limiting hole communicated with the sliding groove, and the locking pull rod penetrates through the limiting hole and is connected with the ruler in a buckling mode through the clamping block and the clamping groove.
Preferably, in the above digital display angle ruler, a locking screw is further included;
the locking screw is used for locking the position of the ruler on the turntable.
Preferably, in the above digital display angle ruler, the ruler frame is provided with a counter bore, and the rotary table is rotatably mounted in the counter bore through the rotating member.
Preferably, in the above digital display angle scale, the digital display angle scale further comprises a fixed wheel and a fixed screw;
the fixed wheel is arranged in the counter bore, and the fixed wheel is fixed between the rotary disc and the bottom of the counter bore through the fixed screw, so that the rotary disc and the ruler frame do not rotate relatively any more.
Preferably, in the digital display angle scale, the fixed wheel is provided with a central hole, and the diameter of one end of the central hole close to the turntable is gradually increased;
the contact end of the fixing screw and the fixing wheel is conical.
Preferably, in the above digital display angle scale, a center line of the central hole and a center line of the fixing screw are not located on the same straight line.
Preferably, in the above digital display angle ruler, the digital display angle ruler further includes a leveling bubble, and the leveling bubble is disposed on a side of the ruler frame away from the turntable.
Preferably, in the above digital display angle ruler, the rotary plate and the ruler frame are both provided with calibration scale marks.
Compared with the prior art, the beneficial effects of this application are:
when the digital display assembly is used, the pulse emitter continuously sends a pulse signal to the main grid, then the pulse receiver receives the pulse signal reflected back from the main grid and transmits the reflected pulse signal to the digital display assembly, finally the digital display assembly is used for comparing the reflected pulse signal with an initial pulse signal when the main grid and the auxiliary grid are relatively static to obtain the variation of the pulse signal, the variation of the pulse signal is calculated to calculate the relative rotation angle between the main grid and the auxiliary grid, and the calculated data is displayed on a display screen of the digital display assembly; and this application is through being as an organic whole with vice bars and carousel connection, chi frame and main bars are connected as an organic whole, and carousel and chi frame rotate to be connected, can turn into the angle change (also be exactly the angle change between main bars and the vice bars) between chi frame and the carousel synchronous impulse signal change between main bars and the vice bars, can measure the angle of the part that awaits measuring conveniently and fast accurately, have easy operation, the error is little and measurement accuracy is high advantage, solve effectively among the prior art that there is the reading error to lead to the technical problem that measurement accuracy is low greatly.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is an exploded view of a digital display angle ruler according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of the connection between a locking pull rod and a straight edge of a digital display angle ruler provided by the embodiment of the application;
FIG. 3 is a schematic view of a connection between a fixing screw and a fixing wheel of a digital display angle ruler according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an application example of a scribing function of a digital display angle ruler according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an application example of a digital display angle ruler horizontal measurement function provided in an embodiment of the present application;
FIG. 6 is a schematic view of a digital display angle ruler according to an embodiment of the present disclosure when no angle is measured;
fig. 7 is a schematic view of an application example of an angle measurement function of a digital display angle gauge according to an embodiment of the present application.
In the figure:
the digital display module comprises a digital display module 1, a locking screw 2, a rotary table 3, an auxiliary grid 4, a main grid 5, a ruler frame 6, a second screw 7, a leveling bubble 8, a first screw 9, a fixed wheel 10, a fixed screw 11, a locking pull rod 12, a ruler 13 and a battery 14.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
At present, many angle rulers frequently used by people determine the angle value of an object to be measured by observing angle scale marks on a measuring plate and a ruler frame, and the reading is very inconvenient; and through the mode of artifical reading, reading error often is great, leads to the measurement accuracy of angle square lower easily. In addition, the embodiment also finds that the prior art has the defects of only measuring the angle of the object, single function and lack of practical function. The embodiment provides a digital display angle ruler, can have practical functions such as horizontal measurement function, marking off function, angle measurement function, and have the higher advantage of measurement accuracy.
Referring to fig. 1 to 7, an embodiment of the present application provides a digital display angle ruler, which includes a digital display module 1, a turntable 3, a ruler frame 6, a main grid 5 and an auxiliary grid 4; grids uniformly arranged along the circumference are arranged on the main grid 5 and the auxiliary grid 4; the turntable 3 is connected with the auxiliary grid 4, the ruler frame 6 is connected with the main grid 5, the turntable 3 is rotationally connected with the ruler frame 6, and the main grid 5 and the auxiliary grid 4 are arranged relatively close to each other; the auxiliary grid 4 is provided with a pulse emitter and a pulse receiver, the digital display component 1 is connected with the turntable 3, and the digital display component 1 is connected with the pulse receiver; the pulse emitter is used for continuously sending pulse signals to the main grid 5; the pulse receiver is used for receiving the pulse signal reflected back from the main grid 5 and transmitting the reflected pulse signal to the digital display component 1; the digital display component 1 is used for obtaining the variation of the pulse signal through comparing the reflected pulse signal with the initial pulse signal when the main grid 5 and the auxiliary grid 4 are relatively static, calculating the relative rotation angle between the main grid 5 and the auxiliary grid 4 through the variation of the pulse signal and displaying the calculated data on the display screen of the digital display component 1.
More specifically, the ruler frame 6 comprises a middle piece and a connecting seat, wherein the middle piece is circular and is arranged in the middle of the connecting seat, and one surface of the straight seat, which is far away from the middle piece, is a flat straight surface; the digital display assembly 1 is arranged on one side of the turntable 3, which is far away from the ruler frame 6; the digital display component 1 is also provided with a battery 14, the battery 14 supplies power for the digital display component 1, and the battery 14 is detachably mounted on the digital display component 1; the outer diameter of the main grid 5 is the same as that of the auxiliary grid 4, the main grid 5 can be fixed on the ruler frame 6 through screws, and the auxiliary grid 4 can also be fixed on the turntable 3 through screws; an electronic chip in the digital display component 1 comprises a pulse timer, receives a feedback signal of the auxiliary grid 4, calculates the relative rotation angle between the main grid 5 and the auxiliary grid 4 through filtering, shaping, signal amplification and signal analysis, and displays the calculated data on a display screen.
When the digital display device is used, the pulse emitter continuously sends a pulse signal to the main grid 5, the pulse receiver receives the pulse signal reflected back from the main grid 5 and transmits the reflected pulse signal to the digital display assembly 1, and finally the digital display assembly 1 is used for comparing the reflected pulse signal with an initial pulse signal when the main grid 5 and the auxiliary grid 4 are relatively static to calculate the variation of the pulse signal, calculating the relative rotation angle between the main grid 5 and the auxiliary grid 4 according to the variation of the pulse signal and displaying the calculated data on the display screen of the digital display assembly 1; and this embodiment is through connecting vice bars 4 and carousel 3 as an organic whole, chi frame 6 and main bars 5 are connected as an organic whole, and carousel 3 and chi frame 6 rotate to be connected, can turn into the pulse signal change between main bars 5 and the vice bars 4 with the angle change between chi frame 6 and carousel 3 (that is to say the angle change between main bars 5 and the vice bars 4) synchronous transformation, can measure the angle of the part that awaits measuring convenient and fast accurately, and the operation is simple, the advantage that the error is little and measurement accuracy is high has, solve effectively among the prior art and have the reading error to lead to the technical problem that measurement accuracy is low greatly.
Further, in the present embodiment, a ruler 13 is further included; the rotary table 3 is provided with a sliding groove, the ruler 13 is slidably mounted in the sliding groove, and the sliding direction of the ruler 13 is parallel to the diameter direction of the rotary table 3. Referring to fig. 4, the ruler 13 can slide on the turntable 3, so that the ruler 13 can be pulled out and extended on the plane of the object to be measured, a user can conveniently mark and mark the plane of the object to be measured, and the practical function of the digital display angle ruler can be increased; meanwhile, the ruler 13 is provided with scale marks, so that the requirement for measuring the distance of the digital display angle ruler can be met.
More specifically, the chute is provided on the circumferential side of the turntable 3, and the length direction of the bottom reference surface of the chute is parallel to the diameter direction of the turntable 3, and the length of the bottom reference surface is smaller than the diameter of the turntable 3.
Further, in the present embodiment, please refer to fig. 2, further comprising a locking pull rod 12; a clamping groove is formed in the middle of the straight scale 13, and a clamping block matched with the clamping groove is arranged on the locking pull rod 12; the rotary table 3 is provided with a limiting hole communicated with the sliding groove, and the locking pull rod 12 penetrates through the limiting hole and is connected with the straight scale 13 in a buckling mode through a clamping block and a clamping groove. Mutually supporting of draw-in groove through ruler 13 and the fixture block of locking pull rod 12 not only can be with ruler 13 buckle in the spout, guarantee that ruler 13 of buckle on carousel 3 can follow the carousel 3 rotation and not drop, but also can restrict the length direction that the slip direction of ruler 13 is the spout to draw out ruler 13 at the activity after carousel 3 is rotatory and rule, mark on the object plane that awaits measuring. Fig. 4 is a schematic diagram of an application example of the straight edge 13 in scribing and marking on the plane of the object to be measured.
More specifically, the length direction of the limiting hole is perpendicular to the length direction of the sliding chute, so that the locking pull rod 12 can be perpendicular to the straight scale 13; a strip-shaped groove is formed in one surface, away from the ruler frame 6, of the rotary table 3 and communicated with the limiting hole so as to facilitate the locking pull rod 12 to be inserted into and pulled out of the limiting hole and facilitate the locking pull rod 12 to penetrate through the limiting hole to be connected with the straight ruler 13 in a buckling mode; the locking pull rod 12 and the clamping block jointly form a hook-shaped structure, and the clamping groove of the straight scale 13 and the hook-shaped structure of the locking pull rod 12 are embedded into each other, so that the straight scale 13 can slide on the bottom reference surface of the sliding chute in a reciprocating mode along the length direction of the sliding chute.
Further, in the present embodiment, a locking screw 2 is further included; the locking screw 2 is used to lock the position of the straightedge 13 on the turntable 3. When the ruler 13 is used for marking and marking on the plane of an object to be measured, the ruler 13 can be moved to a required position, and then the ruler 13 is locked by the locking screw 2, so that the ruler 13 cannot move in the sliding groove, and a user can accurately mark and mark on the plane of the object to be measured.
More specifically, one surface of the rotary table 3, which is far away from the ruler frame 6, is provided with a locking hole communicated with the chute, and the head of the threaded end of the locking screw 2 is conical; the locking pull rod 12 is provided with an inclined plane which is matched with the taper of the thread end head of the locking screw 2, and the inclined plane can be arranged at the concave edge of the middle part of the locking pull rod 12; referring to fig. 2, by rotating the locking screw 2 clockwise (i.e. the rotation direction of the arrow a), the conical head of the locking screw 2 can press the inclined surface of the locking pull rod 12, so that the locking pull rod 12 is displaced along the axial direction of the locking pull rod 12 (i.e. the direction of the arrow B), and the hook-shaped structure of the locking pull rod 12 locks the straight edge 13 on the bottom reference surface of the chute of the turntable 3 by tightening the clamping groove of the straight edge 13, thereby locking the position of the straight edge 13 on the turntable 3, and ensuring that a user can accurately mark and mark a line on the plane of an object to be measured.
Further, in the present embodiment, the scale frame 6 is provided with a counter bore, and the rotary disc 3 is rotatably installed in the counter bore through the rotating member. The rotary table 3 can be internally provided with the ruler frame 6 through the arrangement of the counter bores, so that the whole thickness of the whole digital display angle ruler can be effectively reduced, the occupied space of the whole digital display angle ruler during use is reduced, and convenience is brought to users for normally using the digital display angle ruler in a small space.
More specifically, the rotating member may be a first screw 9, and the center of the rotary table 3, the center of the auxiliary grid 4, the center of the main grid 5 and the center of the ruler frame 6 are all provided with a rotating hole, and the rotary table 3 and the ruler frame 6 can be rotatably connected by the first screw 9 sequentially passing through the center of the rotary table 3, the center of the auxiliary grid 4, the center of the main grid 5 and the center of the ruler frame 6.
Further, in the present embodiment, please refer to fig. 3, further comprising a fixing wheel 10 and a fixing screw 11; the fixed wheel 10 is arranged in the counter bore, the fixed wheel 10 is installed in the vertical direction of the fixed fixing screw 11, and the fixed wheel 10 is fixed between the rotary table 3 and the bottom of the counter bore through the fixed fixing screw 11, so that the rotary table 3 and the ruler frame 6 can not rotate relatively any more. When measuring the angle of the object that awaits measuring through digital display angle square, make and take place relative rotation between carousel 3 and chi frame 6 through rotatory carousel 3 or holding the sword, treat that carousel 3 and chi frame 6 move the both sides of the object contained angle that awaits measuring when, make the tight pulley 10 butt between carousel 3 and counter bore bottom through rotatory set screw 11, can realize that carousel 3 and chi frame 6 no longer rotate relatively, so that pulse receiver and digital display subassembly 1 can receive stable pulse signal, can measure the angle of the object that awaits measuring accurately.
Further, in the present embodiment, the fixed wheel 10 is provided with a central hole, and the diameter of the central hole near one end of the rotating disc 3 is gradually increased; the contact end of the fixing screw 11 with the fixed wheel 10 is conical. The central line of the central hole and the central line of the fixing screw 11 are not on the same straight line, that is, when the fixing screw 11 is in a loose state, the axis of the fixing screw 11 deviates a little from the axis of the central hole of the fixed wheel 10, so that the fixed wheel 10 can be allowed to be free in a small range when the fixing screw 11 is not additionally arranged, and the fixed wheel 10 is ensured not to influence the normal rotation between the turntable 3 and the ruler frame 6. Referring to fig. 3, the threaded end of the fixing screw 11 is conical, and an oblique angle is disposed on the inner wall of the central hole of the fixing wheel 10, wherein the oblique angle corresponds to the taper of the threaded end of the fixing screw 11, and by rotating the fixing screw 11 clockwise (i.e. the rotation direction of the arrow C), the conical head of the fixing screw 11 presses the oblique angle of the fixing wheel 10, so that the fixing wheel 10 is displaced along the radial direction of the fixing wheel 10 (i.e. the direction of the arrow D), the outer edge of the fixing wheel 10 can be forced to press the inner wall of the counter bore of the ruler frame 6, so that the turntable 3 and the ruler frame 6 cannot perform relative rotation, so that the pulse receiver and the digital display module 1 can receive stable pulse signals, and further can accurately measure the angle of the object to be measured. Fig. 7 is an application schematic diagram of the digital display angle ruler for measuring the angle of the object to be measured.
Further, in this embodiment, still include air level 8, air level 8 sets up the one side of keeping away from carousel 3 at chi frame 6, and air level 8 can be dismantled with chi frame 6 through second screw 7 and be connected, and second screw 7 is two, and two screws evenly distributed are on air level 8, guarantee that air level 8 can stably install on chi frame 6 parallelly. Referring to fig. 5, the bottom plane of the ruler frame 6 is attached to the plane to be measured, and then whether the plane to be measured is horizontal is judged by observing whether the bubble of the level bubble 8 is centered, the digital display angle ruler can measure the levelness of the plane of the object to be measured by the arrangement of the level bubble 8, the practical function of the digital display angle ruler can be effectively increased, and the application range of the digital display angle ruler is greatly enlarged.
Further, in the present embodiment, calibration graduation lines are provided on the rotary disc 3 and the ruler frame 6. After each angle measurement, the rotary disc 3 and the ruler frame 6 can be adjusted to be restored to the initial position through calibrating the scale marks so as to carry out a new round of angle measurement. Fig. 6 is a schematic view showing the rotary plate 3 and the frame 6 of the digital display angle ruler being restored to the initial positions.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A digital display angle ruler is characterized by comprising a digital display component, a turntable, a ruler frame, a main grid and an auxiliary grid;
grids uniformly arranged along the circumference are arranged on the main grid and the auxiliary grid;
the turntable is connected with the auxiliary grid, the ruler frame is connected with the main grid, the turntable is rotationally connected with the ruler frame, and the main grid and the auxiliary grid are arranged relatively close to each other;
the auxiliary grid is provided with a pulse emitter and a pulse receiver, the digital display assembly is connected with the turntable, and the digital display assembly is connected with the pulse receiver;
the pulse emitter is used for continuously emitting pulse signals to the main grid;
the pulse receiver is used for receiving the pulse signals reflected back from the main grating and transmitting the reflected pulse signals to the digital display assembly;
the digital display assembly is used for obtaining the variation of the pulse signals through comparing and calculating the reflected pulse signals and the initial pulse signals when the main grid and the auxiliary grid are relatively static, calculating the relative rotation angle between the main grid and the auxiliary grid through the variation of the pulse signals and displaying the calculated data on a display screen of the digital display assembly.
2. The digital display goniometer according to claim 1, further comprising a ruler;
the rotary table is provided with a sliding groove, the ruler is slidably mounted in the sliding groove, and the sliding direction of the ruler is parallel to the diameter direction of the rotary table.
3. The digital display goniometer according to claim 2, further comprising a locking lever;
a clamping groove is formed in the middle of the ruler, and a clamping block matched with the clamping groove is arranged on the locking pull rod;
the turntable is provided with a limiting hole communicated with the sliding groove, and the locking pull rod penetrates through the limiting hole and is connected with the ruler in a buckling mode through the clamping block and the clamping groove.
4. The digital display goniometer according to claim 3, further comprising a locking screw;
the locking screw is used for locking the position of the ruler on the turntable.
5. The digital display angle ruler of claim 1, wherein the ruler frame is provided with a counter bore, and the rotary plate is rotatably mounted in the counter bore through a rotating member.
6. The digital display goniometer according to claim 5, further comprising a fixed wheel and a fixed screw;
the fixed wheel is arranged in the counter bore, and the fixed wheel is fixed between the rotary disc and the bottom of the counter bore through the fixed screw, so that the rotary disc and the ruler frame do not rotate relatively any more.
7. The digital display angle ruler of claim 6, wherein the fixed wheel is provided with a central hole, and the diameter of the central hole at one end close to the rotating disc is gradually increased;
the contact end of the fixing screw and the fixing wheel is conical.
8. The digital display goniometer according to claim 7, characterized in that the center line of the central hole is not located on the same line as the center line of the fixing screw.
9. The digital display angle ruler of claim 1, further comprising a level bubble disposed on a side of the ruler frame away from the turntable.
10. A digital display angle ruler according to any one of claims 1 to 9, wherein the rotary plate and the ruler frame are provided with calibration graduation marks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021696377.2U CN212482444U (en) | 2020-08-14 | 2020-08-14 | Digital display angle ruler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021696377.2U CN212482444U (en) | 2020-08-14 | 2020-08-14 | Digital display angle ruler |
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| CN212482444U true CN212482444U (en) | 2021-02-05 |
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| CN202021696377.2U Active CN212482444U (en) | 2020-08-14 | 2020-08-14 | Digital display angle ruler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11187513B2 (en) * | 2016-11-08 | 2021-11-30 | Doncero (Shanghai) Industrial Co., Ltd. | Angle ruler |
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2020
- 2020-08-14 CN CN202021696377.2U patent/CN212482444U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11187513B2 (en) * | 2016-11-08 | 2021-11-30 | Doncero (Shanghai) Industrial Co., Ltd. | Angle ruler |
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