Compasses

Abstract

According to the technical scheme, the compasses comprise a first rod, a second rod and a compasses head, the top of the first rod and the top of the second rod are provided with a first connecting piece and a second connecting piece respectively, the first connecting piece and the second connecting piece are located in the compasses head and rotationally connected through a first bolt, and the inner side of the first rod and the inner side of the second rod are provided with a first cavity and a second cavity respectively. A connecting groove is formed in the tail portion of the first rod, a receding groove is formed in the tail end of the connecting groove, the connecting groove is rotationally connected with a positioning column, a limiting table is arranged on the positioning column, the positioning column can be folded to the first cavity, a positioning needle is arranged at the bottom of the positioning column, and a drawing piece is arranged at the tail portion of the second rod.

Description

Technical Field

[0001] The present application relates to the technical field of compasses, and in particular to a compass. Background Art

[0002] A compass is a tool used to draw circles or chords in mathematics geometry and drawing, and is often used for ruler and compass drawing. Since the compass needle cannot be folded and contracted, the existing compass can only be used for drawing but not for writing, which is extremely inconvenient, especially when a pen is forgotten. Utility Model Content

[0003] The main purpose of the utility model is to provide a compass to solve the problem that the existing compass can only be used for drawing but not for writing, which is extremely inconvenient especially when a pen is forgotten, because the steel needle of the compass cannot be folded and contracted.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following scheme: a compass, comprising a first rod, a second rod and a compass head, wherein the tops of the first rod and the second rod are respectively provided with a first connecting plate and a second connecting plate, the two are located in the compass head and are rotatably connected by a first bolt, a first cavity and a second cavity are respectively provided on the inner sides of the first rod and the second rod, a connecting groove is provided at the tail of the first rod, a yield groove is provided at the end of the connecting groove, and the connecting groove is rotatably connected to a positioning column, and a limit platform is provided on the positioning column, the positioning column can be folded to the first cavity, and a positioning pin is provided at its bottom, and a drawing piece is provided at the tail of the second rod.

[0005] Furthermore, a limit plate is provided between the first connecting plate and the second connecting plate, a cross hole is provided in the middle of the limit plate, the first limit column and the second limit column respectively provided on the first connecting plate and the second connecting plate are respectively located on both sides of the cross hole, and the limit rod on the limit plate is located in the positioning hole inside the compass head.

[0006] Furthermore, the drawing piece comprises a mounting bolt, a pen tip and a pencil lead, wherein the pencil lead is inserted into the mounting bolt, and the pen tip is also inserted into the mounting bolt for threaded connection.

[0007] Furthermore, symmetrical limiting teeth are provided on the first connecting piece and the second connecting piece.

[0008] Furthermore, a first groove is provided in the middle of the first rod and the second rod, and a second groove is provided at the lower end thereof.

[0009] Furthermore, the compass is provided with a compass sleeve, and a protrusion corresponding to the second groove is provided on the inner side of the compass sleeve.

[0010] The utility model provides a compass with the beneficial effect that the positioning needle can be folded to the first cavity along with the positioning rod, so that the second rod can be conveniently held for writing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings in the specification which constitute a part of this application are used to provide a further understanding of the utility model. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] In the attached picture:

[0013] Figure 1 It is an overall schematic diagram of a compass of the utility model;

[0014] Figure 2 It is an exploded schematic diagram of a compass of the utility model;

[0015] Figure 3 This is an exploded schematic diagram of the second rod of a compass of the utility model;

[0016] Figure 4 This is an exploded schematic diagram of the first rod of a compass of the utility model;

[0017] Figure 5 It is a schematic diagram of a limiting tooth of a compass of the utility model. DETAILED DESCRIPTION

[0018] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] 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.

[0021] like Figure 1-5As shown, in a feasible embodiment of the present utility model, a compass is provided, including a first rod 1, a second rod 2 and a compass head 3, wherein the tops of the first rod 1 and the second rod 2 are respectively provided with a first connecting piece 101 and a second connecting piece 201, which are located in the compass head 3 and are rotatably connected by a first bolt 314, and a first cavity 102 and a second cavity 202 are respectively provided on the inner sides of the first rod 1 and the second rod 2, a connecting groove 105 is provided at the tail of the first rod 1, a yield groove 106 is provided at the end of the connecting groove 105, the connecting groove 105 is rotatably connected to the positioning rod 103, and a limit platform 107 is provided on the positioning rod 103, the positioning rod 103 can be folded to the first cavity 102, and a positioning pin 104 is provided at the bottom of the positioning rod 103, and a drawing piece 21 is provided at the tail of the second rod 2.

[0022] Specifically, the first rod 1, the second rod 2 and the compass head 3 can be made of zinc alloy or aluminum alloy or plastic. A first connecting piece 101 and a second connecting piece 201 of the same size and fixedly connected thereto are respectively provided on the tops of the first rod 1 and the second rod 2. Screw holes are provided in the middle of the two connecting pieces for rotationally connecting with the compass head 3 through a first bolt 314. A first limiting column 12 is provided on the upper right side of the first connecting piece 101, and a second limiting column 22 is provided on the lower left side of the second connecting piece 201. The two are fitted up and down. A limiting piece 31 is provided in the middle of the two connecting pieces, and a cross hole 310 is provided in the middle of the limiting piece 31. The first limiting column 12 is provided on the upper right side of the first connecting piece 101, and a second limiting column 22 is provided on the lower left side of the second connecting piece 201. The two are fitted up and down. The first and second limiter columns 12 and 22 are respectively located in the left and right positioning grooves 311 of the cross hole 310, and a limiter rod 313 is provided on the limiter plate 31. When the two connecting plates are installed to the compass head 3, the limiter rod 313 is also installed in the positioning hole 32 of the compass head to ensure that the limiter plate 31 can only move in a straight line. In this way, when the first rod 1 is opened, the first limiter column 12 applies force to the limiter plate 31, the limiter plate 31 moves downward, and the travel groove 312 moves to the first bolt 314 to open the first rod 1. At the same time, due to the reaction force of the limiter plate 31, the second rod 2 is also opened at the same time, so that when one side is opened, the other side is also opened, which is simple and convenient.

[0023] like Figure 4 As shown, a first cavity 102 is opened on the inner side of the first rod 1, and a connecting groove 105 is provided at the tail end thereof for rotationally connecting with the positioning rod 103, and an oblique giving way groove 106 is opened on the inner side of the end of the connecting groove 105 to facilitate the rotation of the positioning rod 103 to the first cavity 102. At the same time, a limit platform 107 corresponding to the giving way groove 105 is provided on the positioning rod 103 to prevent it from rotating outward. At the same time, a positioning pin 104 is provided at the tail end of the positioning rod 103 for positioning during drawing or surveying.

[0024] like Figure 3As shown, a second cavity 202 is provided on the inner side of the second rod 2, and a connecting hole 203 is provided at the tail end thereof, a mounting bolt 211 is inserted into the connecting hole 203 from the second cavity 202, a pencil lead 213 is inserted into the middle hole of the mounting bolt 211, and a pen tip 212 is inserted into the mounting bolt 211 for threaded connection, so that it is convenient to disassemble and replace the pencil lead.

[0025] like Figure 5 As shown, in order to prevent the opening angle of the first rod 1 and the second rod 2 from being less than 180 degrees, corresponding limiting teeth 11 are respectively provided on the first connecting piece 101 and the second connecting piece 201 .

[0026] like Figure 1 As shown, when writing is required, the positioning rod 103 can be folded to the first cavity 102, and the first rod 1 and the second rod 2 can be closed, so as to facilitate writing.

[0027] like Figure 1 and Figure 2 As shown, a compass cover 4 is provided at the tail of the compass, which can protect the pencil lead 213 and the positioning pin 104 when stored.

[0028] In order to facilitate opening of the compass, a first groove 5 is provided in the middle of the closed first rod 1 and the second rod 2. At the same time, second grooves 6 are provided on the upper and lower surfaces of the closed connection hole 203 and the connection groove 105, which are used to cooperate with the protrusion 41 provided on the inner side of the compass sleeve 4 to lock and prevent it from falling off.

[0029] Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A compass, characterized in that: It includes a first rod, a second rod and a compass head, wherein the tops of the first rod and the second rod are respectively provided with a first connecting plate and a second connecting plate, the two are located in the compass head and are rotatably connected by a first bolt, the inner sides of the first rod and the second rod are respectively provided with a first cavity and a second cavity, a connecting groove is provided at the tail of the first rod, a yield groove is provided at the end of the connecting groove, the connecting groove is rotatably connected to the positioning column, and a limit platform is provided on it, the positioning column can be folded to the first cavity, and a positioning pin is provided at its bottom, and a drawing piece is provided at the tail of the second rod.

2. A compass according to claim 1, characterized in that: A limiting plate is provided between the first connecting plate and the second connecting plate, a cross hole is provided in the middle of the limiting plate, the first limiting column and the second limiting column respectively provided on the first connecting plate and the second connecting plate are respectively located on both sides of the cross hole, and the limiting rod on the limiting plate is located in the positioning hole inside the compass head.

3. A compass according to claim 1, characterized in that: The drawing piece comprises a mounting bolt, a pen tip and a pencil lead, wherein the pencil lead is inserted into the mounting bolt, and the pen tip is also inserted into the mounting bolt for threaded connection.

4. A compass according to claim 2, characterized in that: Symmetrical limiting teeth are provided on the first connecting piece and the second connecting piece.

5. A compass according to claim 1, characterized in that: A first groove is provided in the middle of the first rod and the second rod, and a second groove is provided at the lower end thereof.

6. A compass according to claim 1, characterized in that: The compass is provided with a compass sleeve, and a protrusion corresponding to the second groove is provided on the inner side of the compass sleeve.

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