Compact foldable compasses

Abstract

The utility model relates to the field of compasses, in particular to a compact foldable compass which comprises a compass head, and a rotating shaft seat is fixedly mounted at the bottom of the compass head. The supporting leg mechanism used for learning is rotationally mounted at the bottom of the rotating shaft seat; during drawing, a user rotates the two lead screws through the handles, the lead screws drive the two compass supporting legs to synchronously move outwards through threaded connection of the lead screws and the threaded seats and synchronously drive the two sliding supporting legs to be separated, the pencil lead is driven to move by taking the sharp needle as a supporting point for drawing, and if lines distinguished by different colors need to be drawn, the pencil lead can be separated from the pencil lead by taking the sharp needle as a supporting point. The pen with the specified color is placed in the U-shaped piece, and the fastening bolt is rotated to abut against the pen, so that the pen can be fixed when a user draws a picture, and the situation that the distance between the two sliding supporting legs is changed, and the drawing accuracy is affected is avoided.

Description

Technical Field

[0001] The utility model relates to the field of compasses, in particular to a compact and foldable compass. Background Art

[0002] In mathematics and drawing, a compass is a tool used to draw circles or chords, and is often used in ruler and compass drawing. At present, the compasses in the prior art are not equipped with a dedicated limiting mechanism during use, resulting in the adjustment distance between the pen body and the legs being easily changed due to force during actual drawing operations.

[0003] Therefore, a compact foldable compass is proposed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a compact and foldable compass in order to solve the above-mentioned problem, thereby improving the problem that the compass in the prior art is not equipped with a dedicated limiting mechanism during use, which leads to the problem that the adjusted distance between the pen body and the legs is easily changed due to force during actual drawing operations.

[0005] The utility model achieves the above-mentioned purpose through the following technical scheme, a compact and foldable compass, comprising: a compass head, a rotating shaft seat is fixedly installed on the bottom of the compass head; a leg mechanism, the leg mechanism used for learning is rotatably installed on the bottom of the rotating shaft seat; wherein the leg mechanism comprises a leg fastening assembly and a surveying and mapping assembly, the leg fastening assembly used for learning is rotatably installed on the bottom of the rotating shaft seat, and the surveying and mapping assembly used for measurement is installed on the top of the compass head.

[0006] Preferably, the leg fastening assembly includes two compass legs rotatably mounted on the bottom of the rotating shaft seat, the middle ends of the two compass legs are provided with rectangular holes, the inner cavities of the two rectangular holes are rotatably mounted with threaded seats, the inner cavities of the two threaded seats are threadedly connected with screws, and handles are fixedly mounted on adjacent ends of the two screws, a sliding cavity is provided at the bottom of the inner cavity of the compass leg, and a sliding leg is slidably mounted in the inner cavity of the sliding cavity, an installation groove is provided at the bottom of the two sliding legs, a mounting seat is provided at the bottom of the inner cavity of the installation groove, and a first locking member is installed through the bottom of the front surface of the sliding leg.

[0007] Preferably, a slide groove is provided on the front surfaces of the two sliding legs, and a fixing bolt is installed through the bottom of the front surfaces of the two compass legs, and one end of the fixing bolt is located inside the compass leg and is slidably connected to the slide groove.

[0008] Preferably, a U-shaped piece is rotatably installed at the bottom of one side of the sliding leg, a second locking piece is installed through the front surface of the U-shaped piece, a threaded sleeve is installed through the bottom of the U-shaped piece, and the internal thread of the threaded sleeve is connected to a fastening bolt.

[0009] Preferably, the surveying and mapping assembly includes an outer shell fixedly mounted on the top of the compass head, a mounting shell is mounted in the inner cavity of the outer shell, a tape ruler is wound around the surface of the mounting shell, a volute spring is disposed in the inner cavity of the mounting shell, one end of the volute spring is connected to the tape ruler, and one end of the tape ruler away from the mounting shell passes through the outer shell and extends to the outside of the compass head.

[0010] Preferably, one end of the ruler tape located outside the outer shell is fixedly connected to a limiting block, and one end of the limiting block away from the ruler tape is fixedly connected to a pull ring.

[0011] Preferably, an elastic seat is fixedly installed on one side of the sliding leg and inside the U-shaped member, and a groove is formed on one side of the elastic seat.

[0012] Preferably, a sharp needle is installed through the interior of one of the mounting seats, and a lead core is installed through the inner cavity of the other mounting seat.

[0013] The beneficial effects of the utility model are:

[0014] 1. When drawing, the user rotates the two screw rods through the handle, and the screw rods drive the two compass legs to move outward synchronously through the threaded connection with the threaded seat, and simultaneously drive the two sliding legs to separate, and use the sharp needle as a fulcrum to drive the lead core to move for drawing. If you need to draw lines with different colors, place the pen of the specified color inside the U-shaped part, and turn the fastening bolt to tighten the pen, which can be fixed when the user is drawing, avoiding the change of the distance between the two sliding legs, which affects the drawing accuracy;

[0015] 2. If measurement is required, the user pulls the limit block through the pull ring, and the limit block drives the tape to move outward through the fixed connection with the tape, and drives the scroll spring installed inside the shell to move, which makes it easier for users to measure and use. At the same time, the tape can be easily reeled in through the rebound of the scroll spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of a rectangular hole structure of the utility model;

[0018] Figure 3It is a partial structural schematic diagram of the utility model;

[0019] Figure 4 for Figure 3 Enlarged view of area A in the middle;

[0020] Figure 5 This is a schematic diagram of the structure of the surveying and mapping component of the utility model.

[0021] In the figure: 1. compass head; 2. rotating shaft seat; 3. leg mechanism; 31. leg fastening assembly; 311. compass leg; 312. rectangular hole; 313. threaded seat; 314. screw rod; 315. handle; 316. sliding cavity; 317. sliding leg; 318. mounting groove; 319. mounting seat; 3101. first locking member; 3102. U-shaped member; 3103. second locking member; 3104. threaded sleeve; 3105. fastening bolt; 3106. elastic seat; 32. surveying and mapping assembly; 321. outer shell; 322. mounting shell; 323. ruler tape; 324. limit block; 325. pull ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] When implementing: Figure 1-5 As shown, a compact foldable compass comprises: a compass head 1, a rotating shaft seat 2 is fixedly mounted on the bottom of the compass head 1; a leg mechanism 3, the leg mechanism 3 used for learning is rotatably mounted on the bottom of the rotating shaft seat 2; wherein the leg mechanism 3 comprises a leg fastening assembly 31 and a surveying assembly 32, the leg fastening assembly 31 used for learning is rotatably mounted on the bottom of the rotating shaft seat 2, and the surveying assembly 32 used for measurement is mounted on the top of the compass head 1.

[0024] like Figure 1-5As shown, the leg fastening assembly 31 includes two compass legs 311 rotatably mounted on the bottom of the rotating shaft seat 2, the middle ends of the two compass legs 311 are provided with rectangular holes 312, the inner cavities of the two rectangular holes 312 are rotatably mounted with threaded seats 313, the inner cavities of the two threaded seats 313 are threadedly connected with screw rods 314, the adjacent ends of the two screw rods 314 are fixedly mounted with handles 315, the bottom of the inner cavity of the compass legs 311 is provided with a sliding cavity 316, and the inner cavity of the sliding cavity 316 is slidably mounted with a sliding The movable leg 317, the bottom of the two sliding legs 317 are provided with a mounting groove 318, the bottom of the inner cavity of the mounting groove 318 is provided with a mounting seat 319, and the bottom of the front surface of the sliding leg 317 is penetrated and installed with a first locking member 3101; the front surface of the two sliding legs 317 are provided with a sliding groove, and the bottom of the front surface of the two compass legs 311 are penetrated and installed with a fixing bolt, and one end of the fixing bolt is located inside the compass leg 311 and is slidably connected to the sliding groove; the bottom rotation of one side of the sliding leg 317 A U-shaped piece 3102 is installed on the front surface of the U-shaped piece 3102, and a second locking piece 3103 is installed through the front surface of the U-shaped piece 3102. A threaded sleeve 3104 is installed through the bottom of the U-shaped piece 3102. The internal thread of the threaded sleeve 3104 is connected with a fastening bolt 3105. The two screw rods 314 are rotated by the handle 315, and the screw rods 314 are connected with the threaded seat 313 to drive the two compass legs 311 to move outward synchronously, and synchronously drive the two sliding legs 317 to separate. Drawing is performed by using a sharp needle as a fulcrum to drive the movement of the lead. To draw lines of different colors, the pen of the specified color is placed inside the U-shaped part 3102, and the fastening bolt 3105 is turned to tighten the pen. An elastic seat 3106 is fixedly installed on one side of the sliding leg 317 and located inside the U-shaped part 3102, and a groove is provided on one side of the elastic seat 3106. A sharp needle is installed through the interior of one mounting seat 319, and a lead is installed through the inner cavity of the other mounting seat 319.

[0025] like Figure 1-5 As shown, the surveying and mapping component 32 includes an outer shell 321 fixedly mounted on the top of the compass head 1, an installation shell 322 is installed in the inner cavity of the outer shell 321, a tape 323 is wound around the surface of the installation shell 322, and a volute spring is provided in the inner cavity of the installation shell 322, one end of the volute spring is connected to the tape 323, and the end of the tape 323 away from the installation shell 322 passes through the outer shell 321 and extends to the outside of the compass head 1, and the limit block 324 is pulled by the pull ring 325, and the limit block 324 drives the tape 323 to move outward through the fixed connection with the tape 323, and drives the volute spring inside the installation shell 322 to move, so as to facilitate the user to conduct surveying and mapping; one end of the tape 323 located outside the outer shell 321 is fixedly connected to the limit block 324, and the end of the limit block 324 away from the tape 323 is fixedly connected to the pull ring 325.

[0026] When drawing, the utility model can rotate the two screw rods 314 through the handle 315, and the screw rod 314 drives the two compass legs 311 to move outward synchronously through the threaded connection with the threaded seat 313, and simultaneously drives the two sliding legs 317 to separate, and uses the sharp needle as a fulcrum to drive the lead core to move for drawing. When it is necessary to draw lines distinguished by different colors, the pen of the specified color is placed inside the U-shaped part 3102, and the fastening bolt 3105 is turned to tighten the pen. This effectively solves the problem that the compass in the prior art is not equipped with a dedicated limiting mechanism during use, which leads to the problem that the adjusted distance between the pen body and the legs is easily changed due to force during actual drawing operations.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A compact foldable compass, characterized in that: include: A compass head (1), wherein a rotating shaft seat (2) is fixedly mounted on the bottom of the compass head (1); A leg support mechanism (3) for learning and use, the leg support mechanism (3) being rotatably mounted on the bottom of the rotating shaft seat (2); The leg mechanism (3) comprises a leg fastening assembly (31) and a surveying assembly (32), wherein the leg fastening assembly (31) used for learning is rotatably mounted on the bottom of the rotating shaft seat (2), and the surveying assembly (32) used for measuring is mounted on the top of the compass head (1); The leg fastening assembly (31) comprises two compass legs (311) rotatably mounted on the bottom of the rotating shaft seat (2), the middle ends of the two compass legs (311) are each provided with a rectangular hole (312), the inner cavities of the two rectangular holes (312) are each rotatably mounted with a threaded seat (313), the inner cavities of the two threaded seats (313) are each threadedly connected with a screw rod (314), and a handle (314) is fixedly mounted on one adjacent end of the two screw rods (314) 315), a sliding cavity (316) is provided at the bottom of the inner cavity of the compass leg (311), a sliding leg (317) is slidably installed in the inner cavity of the sliding cavity (316), a mounting groove (318) is provided at the bottom of the two sliding legs (317), a mounting seat (319) is provided at the bottom of the inner cavity of the mounting groove (318), and a first locking member (3101) is installed through the bottom of the front surface of the sliding leg (317); The front surfaces of the two sliding legs (317) are each provided with a sliding groove, and the bottom of the front surfaces of the two compass legs (311) are each penetrated with a fixing bolt, and one end of the fixing bolt located inside the compass leg (311) is slidably connected to the sliding groove; A U-shaped member (3102) is rotatably mounted at the bottom of one side of the sliding leg (317), a second locking member (3103) is installed through the front surface of the U-shaped member (3102), a threaded sleeve (3104) is installed through the bottom of the U-shaped member (3102), and a fastening bolt (3105) is connected to the internal thread of the threaded sleeve (3104).

2. A compact foldable compass according to claim 1, characterized in that: The surveying and mapping assembly (32) comprises an outer shell (321) fixedly mounted on the top of the compass head (1); a mounting shell (322) is mounted in the inner cavity of the outer shell (321); a tape ruler (323) is wound around the surface of the mounting shell (322); a volute spring is disposed in the inner cavity of the mounting shell (322); one end of the volute spring is connected to the tape ruler (323); one end of the tape ruler (323) away from the mounting shell (322) passes through the outer shell (321) and extends to the outside of the compass head (1).

3. A compact foldable compass according to claim 2, characterized in that: One end of the ruler tape (323) located outside the outer shell (321) is fixedly connected to a limit block (324), and one end of the limit block (324) away from the ruler tape (323) is fixedly connected to a pull ring (325).

4. A compact foldable compass according to claim 1, characterized in that: An elastic seat (3106) is fixedly installed on one side of the sliding leg (317) and located inside the U-shaped member (3102), and a groove is formed on one side of the elastic seat (3106).

5. A compact foldable compass according to claim 4, characterized in that: A sharp needle is installed through the interior of one of the mounting seats (319), and a lead core is installed through the inner cavity of the other mounting seat (319).

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