Portable compasses convenient to use

Abstract

The utility model discloses a portable compass convenient to use, which comprises a mounting seat with a reading reference point, a drawing foot and a supporting foot, the drawing foot and the supporting foot are rotatably connected onto the mounting seat, a double-connecting-rod mechanism is hinged onto the drawing foot and the supporting foot, and two connecting rods of the double-connecting-rod mechanism are always in bilateral symmetry during folding or unfolding. A scale rod which ascends and descends along with the hinge shaft is arranged on the hinge shaft of the two connecting rods, and when the scale rod is vertical, the scale value, opposite to the reading reference point, on the scale rod is the distance between the drawing foot and the fulcrum of the supporting foot. Compared with the prior art, the utility model has the advantages that during drawing, the supporting leg or the drawing leg is rotated to unfold the supporting leg and the drawing leg, and the distance between the supporting leg and the supporting leg, namely the drawing radius, can be obtained by reading the value of the scale rod and the reference point; the needed radius does not need to be measured on the graduated scale through a drawing leg of the compasses and a supporting point of a supporting leg, and the compasses are easy and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching, in particular to a portable compass which is convenient to use. Background Art

[0002] In geometry and drawing, a compass is a tool used to draw circles or chords. A compass usually has two legs, the upper end is hinged, and the lower end can be separated or closed at will to adjust the radius of the drawn arc. The end of one leg is a needle tip, and the end of the other leg can be fitted with a leg for drawing pencil lines or ink lines.

[0003] For example, the Chinese utility model patent "Compass" with patent publication number CN200981427Y includes a bracket, one end of which is a suction cup, the top of which is provided with a metal ring, a metal rod passes through the metal ring, and a certain gap is maintained between the two, and one end of the metal rod is fixedly connected to the compass bracket rod.

[0004] In the above solution, when the compass is used, the two ends of the compass bracket need to be used to measure the required radius on the scale, which is a rather troublesome operation. Utility Model Content

[0005] The utility model aims to solve the problem that when a compass is used, the two ends of a compass bracket need to be used to measure a required radius on a scale, which is troublesome to operate. The technical problem to be solved by the utility model is to provide a portable compass that is easy to use.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a portable compass that is easy to use, including a mounting base with a reading reference point and a drawing foot and a supporting foot rotatably connected to the mounting base, a double-link mechanism is hinged on the drawing foot and the supporting foot, the two connecting rods of the double-link mechanism always maintain left-right symmetry during folding or unfolding, a scale rod that follows the lifting of the hinge shaft is provided on the hinge shaft of the two connecting rods, and when the scale rod is vertical, the scale value on the scale rod relative to the reading reference point is the distance between the fulcrum of the drawing foot and the supporting foot.

[0007] A further preferred scheme of the utility model is: a circular mounting groove is provided in the mounting seat, a first arc-shaped rack and a second arc-shaped rack are slidably provided in the mounting groove, a pinion is provided between the first arc-shaped rack and the second arc-shaped rack, the pinion meshes with the first arc-shaped rack and the second arc-shaped rack at the same time, and rotating the first annular rack drives the pinion to rotate, thereby driving the second arc-shaped rack to rotate, the first arc-shaped rack is connected to one of the drawing foot and the supporting foot, and the second arc-shaped rack is connected to the other of the drawing foot and the supporting foot.

[0008] A further preferred solution of the present invention is that the first arc-shaped rack and the second arc-shaped rack are in the shape of half an arc.

[0009] A further preferred scheme of the utility model is: the first arc-shaped rack has a first connecting end, the second arc-shaped rack has a second connecting end, the first connecting end and the second connecting end are both provided with an insert block, the drawing foot and the supporting foot are both provided with a slot matching the insert block, the first connecting end is plugged into one of the drawing foot and the supporting foot through the insert block, and the second connecting end is plugged into the other of the drawing foot and the supporting foot through the insert block.

[0010] A further preferred solution of the utility model is that a hand-held part is fixedly provided on the top of the mounting seat.

[0011] A further preferred solution of the utility model is that the lower side wall of the mounting seat is provided with a notch to prevent the support foot and the drawing foot from interfering with each other during rotation, and the support foot and the drawing foot rotate in the notch.

[0012] A further preferred solution of the utility model is: a slideway is provided on the supporting foot, and a needle tip is slidably provided on the slideway.

[0013] A further preferred solution of the utility model is that after the supporting legs and the drawing legs are folded, the supporting legs and the drawing legs are abutted against each other to form a semi-enclosed structure.

[0014] A further preferred solution of the utility model is that the drawing foot and the supporting foot are respectively hinged to the mounting seat, and the mounting seat is provided with a channel for the ruler rod to pass through and keep the ruler rod vertical all the time.

[0015] A further preferred solution of the utility model is that the drawing foot and the supporting foot are hinged on the mounting seat through a first hinge shaft, and the first hinge shaft is provided with a through hole for the ruler rod to pass through and keep the ruler rod always vertical.

[0016] Compared with the prior art, the utility model has the following advantages: a double-link mechanism is hinged on the drawing foot and the supporting foot, and the two connecting rods of the double-link mechanism always maintain left-right symmetry during folding or unfolding, and a scale rod that follows the lifting and lowering of the scale rod is provided on the hinge shaft of the two connecting rods. When the scale rod is vertical, the scale value on the scale rod relative to the reading reference point is the distance between the fulcrum of the drawing foot and the supporting foot. Through the cooperation of the scale rod and the double-link mechanism, when drawing, the supporting foot or the drawing foot is rotated to unfold the supporting foot and the drawing foot, and the value of the scale rod and the reference point can be read to obtain the distance between the fulcrum of the drawing foot and the supporting foot, that is, the drawing radius. There is no need to use the drawing foot of a compass and the fulcrum of the supporting foot to measure the required radius on the ruler, and it is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be regarded as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings only conceptually represent the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the mounting base of the first embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the first embodiment of the utility model;

[0021] Figure 4 This is the first embodiment of the utility model Figure 3 A partial enlarged view of the middle A;

[0022] Figure 5 This is one of the exploded views of the first embodiment of the utility model;

[0023] Figure 6 This is the second exploded view of the first embodiment of the utility model;

[0024] Figure 7 This is the third exploded view of the first embodiment of the utility model;

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the drawing foot and the supporting foot when folded in the first embodiment of the utility model;

[0026] Fig. 9 This is a schematic diagram of the three-dimensional structure of the second embodiment of the utility model;

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the third embodiment of the utility model.

[0028] In the figure: 1. drawing foot; 2. supporting foot; 21. slide; 22. needle tip; 3. mounting seat; 31. mounting groove; 32. notch; 41. first arc-shaped rack; 42. second arc-shaped rack; 43. pinion; 44. first connecting end; 45. second connecting end; 46. plug-in block; 5. double-link mechanism; 51. first connecting rod; 52. second connecting rod; 6. ruler rod; 7. slot; 8. hand-held part; 9. channel; 10. through hole. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary and should not be construed as limiting the protection scope of the present invention.

[0030] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0031] Embodiment 1

[0032] This embodiment mainly describes a portable compass that is easy to use, as follows:

[0033] like Figures 1 to 8 As shown, a portable compass that is easy to use comprises a drawing foot 1, a supporting foot 2 and a mounting seat 3. The drawing foot is provided with a drawing pen, and the mounting seat 3 is provided with a reading reference point. The drawing foot 1 and the supporting foot 2 are hinged with a double-link mechanism 5. The two connecting rods of the double-link mechanism always maintain left-right symmetry during folding or unfolding. The two connecting rods are hinged through a hinge shaft, and the hinge shaft is provided with a ruler rod 6 that follows the hinge shaft to rise and fall. When the ruler stem is vertical, the scale value on the ruler rod 6 relative to the reading reference point is the distance between the fulcrums of the drawing foot 1 and the supporting foot 2. The value on the ruler rod 6 is equal to the distance between the fulcrums of the drawing foot and the supporting foot 2 obtained after conversion and setting. When the drawing foot 1 is driven to rotate, the double-link mechanism 5 rotates with the drawing foot 1, thereby driving the supporting foot 2 to rotate; when the supporting foot 2 is driven to rotate, the double-link mechanism 5 rotates with the supporting foot 2, thereby driving the drawing foot 1 to rotate. The double-link mechanism always maintains left-right symmetry, which can ensure that the angle of rotation of the drawing foot 1 and the supporting foot 2 is the same each time. When the drawing foot 1 rotates, the double-link mechanism 5 is driven to rotate so that the supporting foot 2 and the drawing foot 1 are unfolded or folded, so as to realize the switching of the distance between the drawing foot 1 and the supporting foot 2 fulcrum. By adjusting the distance between the drawing foot 1 and the supporting foot 2 fulcrum, the drawing radius can be adjusted when drawing with a compass. When the drawing foot 1 and the supporting foot 2 are unfolded, the double-link mechanism 5 will drive the ruler rod 6 to rise and read the scale value corresponding to the reference point on the ruler rod 6 to obtain the distance between the fulcrum of the drawing foot 1 and the supporting foot 2; when the drawing foot 1 and the supporting foot 2 are folded, the double-link mechanism 5 will drive the ruler to descend and return to the initial state. Through the cooperation of the ruler rod 6 and the double-link mechanism 5, when drawing, the supporting foot 2 or the drawing foot 1 is rotated to unfold the supporting foot 2 and the drawing foot 1, and the distance between the fulcrum of the drawing foot 1 and the supporting foot 2 and the drawing radius can be obtained by reading the value of the ruler rod 6 and the reference point. It is no longer necessary to use the fulcrum of the drawing foot 1 and the supporting foot 2 of the compass to measure the required radius on the ruler, which is simple and convenient to use.

[0034] like Figure 3 , Figure 4, Figure 5 and Figure 6 The double-link mechanism 5 includes a first connecting rod 51 and a second connecting rod 52, one end of the first connecting rod 51 is hinged to one end of the second connecting rod 52, the other end of the first connecting rod 51 is hinged to the supporting foot 2, and the other end of the second connecting rod 52 is hinged to the drawing foot 1. When the drawing foot 1 and the supporting foot 2 are unfolded, the distance between the fulcrums of the drawing foot 1 and the supporting foot 2 becomes larger, and the angle between the first connecting rod 51 and the supporting foot 2 and the second connecting rod 52 and the drawing foot 1 becomes larger, driving the ruler rod 6 to rise; when the drawing foot 1 and the supporting foot 2 are folded, the angle between the first connecting rod 51 and the supporting foot 2 and the second connecting rod 52 and the drawing foot 1 is close to zero degrees, and the ruler rod 6 returns to the initial state of descending.

[0035] like Figure 4 and Figure 5 As shown, the mounting seat 3 has an annular mounting groove 31, and a first arc-shaped rack 41 and a second arc-shaped rack 42 are slidably arranged in the mounting groove 31. The first arc-shaped rack 41 and the second arc-shaped rack 42 are half arcs with equal diameters and coincident centers. The shapes of the first arc-shaped rack 41 and the second arc-shaped rack 42 match the mounting groove 31. A pinion 43 is arranged between the first arc-shaped rack 41 and the second arc-shaped rack 42. The pinion 43 always simultaneously rotates the first arc-shaped rack 41 and the second The arc-shaped rack 42 is meshed, and rotating the first annular rack drives the pinion 43 to rotate, thereby driving the second arc-shaped rack 42 to rotate. The first arc-shaped rack 41 is connected to one of the drawing foot 1 and the supporting foot 2, and the second arc-shaped rack 42 is connected to the other of the drawing foot 1 and the supporting foot 2. There are two specific connection methods: the first arc-shaped rack 41 is connected to the drawing foot 1, and the second arc-shaped rack 42 is connected to the supporting foot 2; or the first arc-shaped rack 41 is connected to the supporting foot 2, and the second arc-shaped rack 42 is connected to the drawing foot 1.

[0036] like Figure 5As shown, the first arc-shaped rack 41 has a first connecting end 44, and the second arc-shaped rack 42 has a second connecting end 45. The first connecting end 44 and the second connecting end 45 are both provided with an insert block 46. The tops of the drawing foot 1 and the supporting foot 2 have connecting parts, and the two connecting parts are both provided with a slot 7 matching the insert block 46. The first connecting end 44 is plugged into one of the drawing foot 1 and the supporting foot 2 through the insert block 46, and the second connecting end 45 is plugged into the other of the drawing foot 1 and the supporting foot 2 through the insert block 46. Specifically, there are two situations: the first connecting end 44 is plugged into the drawing foot 1 through the plug block 46 so that the drawing foot 1 is connected to the first arc-shaped rack 41, and the second connecting end 45 is plugged into the supporting foot 2 through the plug block 46 so that the supporting foot 2 is connected to the second arc-shaped rack 42; or the first connecting end 44 is plugged into the supporting foot 2 through the plug block 46 so that the supporting foot 2 is connected to the first arc-shaped rack 41, and the second connecting end 45 is plugged into the drawing foot 1 through the plug block 46 so that the drawing foot 1 is connected to the second arc-shaped rack 42; to avoid interference with the rotation of the first arc-shaped rack 41 and the second arc-shaped rack 42 after the slot 7 and the plug block 46 are plugged in, the slot 7 and the plug block 46 are both circular fox-shaped, and the center of the slot 7 and the plug block 46 are concentric with the center of the first arc-shaped rack 41 and the second arc-shaped rack 42, and the curvature of the slot 7 and the plug block 46 is equal to the curvature of the first arc-shaped rack 41 and the second arc-shaped rack 42.

[0037] Preferably, a hand-held portion 8 is fixedly provided on the top of the mounting base 3, and the hand-held portion 8 is used to facilitate the hand to take and turn the compass when drawing. The hand-held portion 8 is provided with friction stripes to prevent the hand-held portion 8 from slipping when in contact with the hand during use. A connecting hole is provided on the top of the mounting base 3, and the gear shaft of the pinion 43 passes through the connecting hole and is rotatably connected to the hand-held portion 8.

[0038] Preferably, the lower side wall of the mounting seat 3 is provided with a slot 32 to prevent the support foot 2 and the drawing foot 1 from interfering with each other during rotation. The support foot 2 and the drawing foot 1 rotate in the slot 32 , and the slot 32 is a strip-shaped slot or a racetrack-shaped slot.

[0039] Preferably, a slide 21 is provided on the supporting foot 2, and a needle tip 22 is slidably provided on the slide 21. The needle tip 22 can slide in the slide 21. When the compass is used up, the needle tip 22 can be pushed to slide in the slide 21. Retracting the needle tip 22 can prevent the body from being stabbed by the needle tip 22 when not in use. The needle tip 22 is used to be fixed to the drawing board to determine the center of the circle.

[0040] Preferably, after the supporting foot 2 and the drawing foot 1 are folded, the supporting foot 2 and the drawing foot 1 are abutted against each other to form a semi-enclosed structure, and the entire compass can be used as a pen.

[0041] Embodiment 2

[0042] A portable compass that is easy to use, such as Fig. 9 As shown, it comprises a drawing foot 1, a supporting foot 2 and a mounting seat 3, the mounting seat 3 is provided with a reading reference point, the drawing foot 1 and the supporting foot 2 are respectively hinged to the mounting seat 3, a double-link mechanism 5 is hinged to the drawing foot 1 and the supporting foot 2, the two connecting rods of the double-link mechanism 5 always keep left-right symmetry during folding or unfolding, the hinge shafts of the two connecting rods are provided with a scale rod 6 which follows the hinge shaft to rise and fall, the mounting seat 3 is provided with a channel 9 for the scale rod 6 to pass through and always keep the scale rod 6 vertical, the scale value on the scale rod 6 relative to the reading reference point is the distance between the fulcrums of the drawing foot 1 and the supporting foot 2, when the drawing foot 1 is driven to rotate, the double-link mechanism 5 rotates with the drawing foot 1, thereby driving the supporting foot 2 to rotate; when the supporting foot 2 is driven to rotate, the double-link mechanism 5 rotates with the supporting foot 2, thereby driving the drawing foot 1 to rotate. The double-link mechanism always keeps left-right symmetry, which can ensure that the angle of rotation of the drawing foot 1 and the supporting foot 2 is the same each time. When the drawing foot 1 rotates, the double-link mechanism 5 is driven to rotate so that the supporting foot 2 and the drawing foot 1 are unfolded or folded, so as to switch the distance between the drawing foot 1 and the supporting foot 2 fulcrum. By adjusting the distance between the fulcrums of the drawing foot 1 and the supporting foot 2, the size of the drawing radius can be adjusted when drawing with a compass. When the drawing foot 1 and the supporting foot 2 are unfolded, the double-link mechanism 5 will drive the ruler rod 6 to rise and read the scale value corresponding to the reference point on the ruler rod 6 to obtain the distance between the fulcrums of the drawing foot 1 and the supporting foot 2; when the drawing foot 1 and the supporting foot 2 are folded, the double-link mechanism 5 will drive the ruler to descend and return to the initial state.

[0043] Example 3

[0044] A portable compass that is easy to use, such as Fig.10As shown, it comprises a drawing foot 1, a supporting foot 2 and a mounting seat 3, the mounting seat 3 is provided with a reading reference point, the drawing foot 1 and the supporting foot 2 are hinged on the mounting seat 3 through a first hinge shaft, a double-link mechanism 5 is hinged on the drawing foot 1 and the supporting foot 2, the two connecting rods of the double-link mechanism 5 always keep left-right symmetry during folding or unfolding, the hinge shaft of the two connecting rods is provided with a scale rod 6 that follows the hinge shaft to rise and fall, the first hinge shaft is provided with a through hole 10 for the scale rod 6 to pass through and always keep the scale rod 6 vertical, the scale value on the scale rod 6 relative to the reading reference point is the distance between the fulcrums of the drawing foot 1 and the supporting foot 2. When the drawing foot 1 is driven to rotate, the double-link mechanism 5 rotates with the drawing foot 1, thereby driving the supporting foot 2 to rotate; when the supporting foot 2 is driven to rotate, the double-link mechanism 5 rotates with the supporting foot 2, thereby driving the drawing foot 1 to rotate. The double-link mechanism always keeps left-right symmetry, which can ensure that the angle of rotation of the drawing foot 1 and the supporting foot 2 is the same each time. When the drawing foot 1 rotates, the double-link mechanism 5 is driven to rotate so that the supporting foot 2 and the drawing foot 1 are unfolded or folded, so as to switch the distance between the drawing foot 1 and the supporting foot 2 fulcrum. By adjusting the distance between the fulcrums of the drawing foot 1 and the supporting foot 2, the size of the drawing radius can be adjusted when drawing with a compass. When the drawing foot 1 and the supporting foot 2 are unfolded, the double-link mechanism 5 will drive the ruler rod 6 to rise and read the scale value corresponding to the reference point on the ruler rod 6 to obtain the distance between the fulcrums of the drawing foot 1 and the supporting foot 2; when the drawing foot 1 and the supporting foot 2 are folded, the double-link mechanism 5 will drive the ruler rod 6 to descend and return to the initial state.

[0045] In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0046] The above is a detailed introduction to a portable compass that is easy to use provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified. These improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A portable compass that is easy to use, comprising a mounting base with a reading reference point and a drawing foot and a supporting foot rotatably connected to the mounting base, characterized in that: A double-link mechanism is hinged on the drawing foot and the supporting foot. The two links of the double-link mechanism always maintain left-right symmetry during folding or unfolding. A scale rod that follows the rise and fall of the scale rod is provided on the hinge shaft of the two links. When the scale rod is vertical, the scale value on the scale rod relative to the reading reference point is the distance between the fulcrum of the drawing foot and the supporting foot.

2. A portable compass that is easy to use according to claim 1, characterized in that: The mounting seat is provided with a circular mounting groove, in which a first arc-shaped rack and a second arc-shaped rack are slidably provided, a pinion is provided between the first arc-shaped rack and the second arc-shaped rack, and the pinion meshes with the first arc-shaped rack and the second arc-shaped rack at the same time, and rotating the first annular rack drives the pinion to rotate, thereby driving the second arc-shaped rack to rotate, the first arc-shaped rack is connected to one of the drawing foot and the supporting foot, and the second arc-shaped rack is connected to the other of the drawing foot and the supporting foot.

3. A portable compass that is easy to use according to claim 2, characterized in that: The first arc-shaped rack and the second arc-shaped rack are in the shape of half an arc.

4. A portable compass that is easy to use according to claim 2, characterized in that: The first arc-shaped rack has a first connecting end, and the second arc-shaped rack has a second connecting end. The first connecting end and the second connecting end are both provided with plug-in blocks. The drawing foot and the supporting foot are both provided with slots matching the plug-in blocks. The first connecting end is plugged into one of the drawing foot and the supporting foot through the plug-in block, and the second connecting end is plugged into the other of the drawing foot and the supporting foot through the plug-in block.

5. The portable compass according to claim 1 is characterized in that: A hand-held part is fixedly provided on the top of the mounting seat.

6. The portable compass according to claim 1, characterized in that: The lower side wall of the mounting seat is provided with a notch to prevent the support foot and the drawing foot from interfering with each other during rotation, and the support foot and the drawing foot rotate in the notch.

7. The portable compass according to claim 1 is characterized in that: The supporting foot is provided with a slideway, and a needle tip is slidably provided on the slideway.

8. The portable compass according to claim 1, characterized in that: After the supporting feet and the drawing feet are folded, the supporting feet and the drawing feet are abutted against each other to form a semi-enclosed structure.

9. The portable compass according to claim 1, characterized in that: The drawing foot and the supporting foot are respectively hinged to the mounting seat, and the mounting seat is provided with a channel for the ruler rod to pass through and keep the ruler rod vertical all the time.

10. The portable compass that is easy to use according to claim 1, characterized in that: The drawing foot and the supporting foot are hinged on the mounting seat through a first hinge shaft, and the first hinge shaft is provided with a through hole for the ruler rod to pass through and keep the ruler rod vertical all the time.

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