Wedge type positioning compasses

Abstract

The utility model provides a wedge type positioning compass which comprises a connector, a positioning compass foot and a rotating compass foot, the top of the positioning compass foot and the top of the rotating compass foot are located in the hinge groove, the positioning compass foot and the rotating compass foot are mutually hinged through the connector, and a synchronous positioning piece is arranged on the hinge face between the positioning compass foot and the rotating compass foot. Wedge-shaped surfaces are arranged at the tops of the positioning gauge leg and the rotating gauge leg, the wedge-shaped surfaces are conical surfaces, and the rotation axis of the generatrix of each wedge-shaped surface is coaxial with the hinge axis of the positioning gauge leg and the rotating gauge leg; a wedge-shaped block matched with the wedge-shaped face is arranged at the bottom of the hinge groove, and a packing knob used for pushing the wedge-shaped block to extrude the wedge-shaped face is arranged on the top of the connector. The utility model has the advantage that the included angle between the positioning compass leg and the rotating compass leg can be fixed.

Description

Technical Field

[0001] This utility model relates to the field of stationery or drafting tools, specifically to a wedge-type positioning compass. Background Technology

[0002] To maintain a consistent opening angle between the two legs of an existing compass, it employs either a gear meshing system or a synchronous positioning plate. The synchronous positioning plate slides during compass opening and closing through the fit between a pin and a groove, and its movement trajectory is ensured by the sliding cooperation between the positioning rod and the connector. However, after prolonged use, the damping (positioning) effect between the two legs of these two types of compasses weakens, or they are prone to change due to external forces after the opening angle is adjusted, affecting the normal use of the compass. Utility Model Content

[0003] Based on the above problems, the purpose of this utility model is to provide a wedge-type positioning compass that can fix the included angle between the positioning foot and the rotating foot.

[0004] To address the above problems, the following technical solution is provided: a wedge-type positioning compass, including a connector with a hinge groove, and a positioning foot and a rotating foot hinged together by the connector, with their tops located within the hinge groove. A synchronous positioning piece is provided on the hinge surface between the positioning foot and the rotating foot. A wedge-shaped surface is provided on the top of both the positioning foot and the rotating foot. The wedge-shaped surface is a conical surface, and its generatrix's axis of rotation is coaxial with the hinge axis of both the positioning foot and the rotating foot. A wedge-shaped block adapted to the wedge-shaped surface is provided at the bottom of the hinge groove, and a tightening knob for pushing the wedge-shaped block to press against the wedge-shaped surface is provided on the top of the connector.

[0005] The present invention is further configured such that the wedge-shaped surface is located at the junction of the top surface of the positioning gauge foot and the side facing the rotating gauge foot, and at the junction of the top surface of the rotating gauge foot and the side facing the positioning gauge foot; when the tightening knob is tightened, it pushes the wedge block to move towards the hinge axis between the positioning gauge foot and the rotating gauge foot, forcing its two sides to fit and press against each wedge-shaped surface.

[0006] The present invention is further configured such that the clamping knob is threadedly engaged with the connector.

[0007] The present invention is further configured such that: the top of the connector is provided with a threaded sleeve, and the outer wall of the threaded sleeve is provided with an external thread; the wedge block is provided with a push rod that passes through the threaded sleeve and is exposed; the tightening knob is provided with an internal thread that engages with the external thread, and the bottom of the internal thread hole abuts against the end of the push rod.

[0008] The present invention is further configured such that the end face of the extension end of the push rod is hemispherical.

[0009] The present invention is further configured such that the hinge surfaces between the synchronous positioning plate and the positioning gauge foot and the rotating gauge foot are adapted to the sliding groove by a sliding pin, so that the synchronous positioning plate can be controlled to slide when the positioning gauge foot and the rotating gauge foot are opened or closed; the synchronous positioning plate is provided with a guide hole at its center, and a positioning pin is provided at one end of the synchronous positioning plate away from the bottom of the sliding groove, extending towards the wall of the sliding groove; the two walls of the hinge groove are provided with guide grooves adapted to the positioning pin.

[0010] The present invention is further configured such that the major diameter of the guide hole is oriented toward its sliding direction or the opening direction of the guide groove; the positioning gauge foot, the rotating gauge foot, and the connector are hinged together by screws, and the screws are set through the guide hole.

[0011] The present invention is further configured such that the sliding groove is located on both sides of the synchronous positioning piece, and the sliding pin is located on the side of the synchronous positioning piece and the side of the positioning gauge foot facing the synchronous positioning piece.

[0012] The present invention is further configured such that when the wedge block presses the wedge surface, it forces the positioning gauge foot and the rotating gauge foot to move away from each other in the axial direction of their hinge axis and to be in close contact with the two side walls of the hinge groove.

[0013] The present invention is further provided that the outer wall of the tightening knob is provided with anti-slip texture.

[0014] The beneficial effects of this utility model are: by tightening or loosening the clamping knob, the wedge block is pushed to abut against the wedge-shaped surfaces of the positioning gauge foot and the rotating gauge foot, thereby providing friction to achieve a fixing effect for the positioning gauge foot and the rotating gauge foot. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the positioning gauge foot and the rotating gauge foot of this utility model in their open state.

[0017] Figure 3 This utility model Figure 1 A full-section three-dimensional structural diagram of the connector.

[0018] Figure 4 This utility model Figure 1 A full-section three-dimensional structural diagram of the positioning gauge feet, rotating gauge feet, and connectors.

[0019] Figure 5 This utility model Figure 2 A full-section three-dimensional structural diagram of the connector.

[0020] Figure 6 This utility model Figure 2 A full-section three-dimensional structural diagram of the positioning gauge feet, rotating gauge feet, and connectors.

[0021] Figure 7 This is a first-view exploded three-dimensional structural diagram of the present invention.

[0022] Figure 8 This is a second-view exploded three-dimensional structural diagram of the present invention.

[0023] The labels in the diagram mean: 10-Connector; 101-Screw sleeve; 102-External thread; 11-Hinge groove; 111-Guide groove; 20-Positioning gauge foot; 30-Rotation gauge foot; 40-Synchronous positioning piece; 41-Slide groove; 42-Guide hole; 43-Positioning pin; 50-Wedge surface; 51-Slide pin; 60-Wedge block; 61-Push rod; 70-Pressure knob; 71-Internal thread; 72-Anti-slip texture; 80-Screw. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] refer to Figures 1 to 8 ,like Figures 1 to 8 The wedge-type positioning compass shown includes a connector 10 with a hinge groove 11, and a positioning foot 20 and a rotating foot 30 hinged to each other within the hinge groove 11. A synchronous positioning piece 40 is provided on the hinge surface between the positioning foot 20 and the rotating foot 30. A wedge-shaped surface 50 is provided on the top of both the positioning foot 20 and the rotating foot 30. The wedge-shaped surface 50 is a conical surface, and its generatrix rotation axis is coaxial with the hinge axis of both the positioning foot 20 and the rotating foot 30 (ensuring that the wedge-shaped surface 50 can properly engage with the wedge block 60 at any angle of the positioning foot 20 and the rotating foot 30). A wedge block 60 adapted to the wedge surface 50 is provided at the bottom of the hinge groove 11, and a tightening knob 70 is provided on the top of the connector 10 for pushing the wedge block 60 to press against the wedge surface 50.

[0026] In the above structure, the wedge block 60 is pushed to fit with the wedge surface 50 by the tightening knob 70, thereby fixing the opening angle of the positioning gauge foot 20 and the rotating gauge foot 30. It has the advantages of simple overall structure, large contact friction, and stable fixation. When the tightening knob 70 is released, the wedge block 60 automatically releases under the action of the taper, so that the positioning gauge foot 20 and the rotating gauge foot 30 resume rotation.

[0027] In this embodiment, the wedge-shaped surface 50 is located at the junction of the top surface of the positioning gauge foot 20 and the side facing the rotating gauge foot 30, and at the junction of the top surface of the rotating gauge foot 30 and the side facing the positioning gauge foot 20; when the tightening knob 70 is tightened, it pushes the wedge block 60 to move in the direction of the hinge axis between the positioning gauge foot 20 and the rotating gauge foot 30, forcing its two sides to fit and press against each wedge-shaped surface 50.

[0028] In the above structure, the thrust generated by the wedge block 60 adapting to the wedge surface 50 when it is pushed is supported by the hinge axis between the positioning gauge foot 20 and the rotating gauge foot 30, thus ensuring the stability of the force.

[0029] In this embodiment, the clamping knob 70 is threadedly engaged with the connector 10.

[0030] In the above structure, the threaded fitting can provide a stable thrust through rotation, and can also be effectively loosened.

[0031] In this embodiment, the connector 10 is provided with a threaded sleeve 101 at the top, and the outer wall of the threaded sleeve 101 is provided with an external thread 102; the wedge block 60 is provided with a push rod 61 that passes through the threaded sleeve 101 and is exposed; the tightening knob 70 is provided with an internal thread 71 that engages with the external thread 102, and the bottom of the hole of the internal thread 71 abuts against the end of the push rod 61.

[0032] In the above structure, the push rod 61 is used to guide the sliding of the wedge block 60, and at the same time, it acts as a support and abuts against the bottom of the internal thread 71 hole of the threaded sleeve 101.

[0033] In this embodiment, the end face of the extended end of the push rod 61 is hemispherical.

[0034] In the above structure, a point contact is formed between the push rod 61 and the bottom of the internal thread 71 hole, reducing the frictional force during rotation.

[0035] In this embodiment, the hinge surfaces between the synchronous positioning plate 40 and the positioning gauge foot 20 and the rotating gauge foot 30 are adapted to the sliding groove 41 by a sliding pin 51, so that the synchronous positioning plate 40 can be controlled to slide when the positioning gauge foot 20 and the rotating gauge foot 30 open or close; the synchronous positioning plate 40 is provided with a guide hole 42 at its center, and a positioning pin 43 extending toward the wall of the sliding groove 41 is provided at one end of the synchronous positioning plate 40 away from the bottom of the groove; the two walls of the hinge groove 11 are provided with guide grooves 111 adapted to the positioning pin 43.

[0036] In the above structure, the synchronous positioning plate 40 is adapted to the positioning gauge foot 20 and the rotating gauge foot 30 through the sliding pin 51 and the sliding groove 41 to realize the synchronous opening and closing of the two. The traditional synchronous positioning plate 40 restricts its sliding direction through the guide rod. Since the position of the guide rod is occupied by the push rod 61 in this solution, it is necessary to guide it through the positioning pin 43 and the guide groove 111.

[0037] In this embodiment, the major diameter of the guide hole 42 is oriented toward its sliding direction or the opening direction of the guide groove 111; the positioning gauge foot 20, the rotating gauge foot 30, and the connector 10 are hinged together by screws 80, which pass through the guide hole 42.

[0038] In the above structure, the guide groove 111 and the positioning pin 43 are adapted to guide the synchronous positioning piece 40, and the guide hole 42 and the screw 80 are used to constrain the sliding direction of the synchronous positioning piece 40.

[0039] In this embodiment, the slide groove 41 is located on both sides of the synchronous positioning piece 40, and the slide pin 51 is located on the side of the synchronous positioning piece 40 and the positioning foot 20 facing the synchronous positioning piece 40, respectively.

[0040] The above structure represents existing technology that allows for synchronous opening and closing.

[0041] In this embodiment, when the wedge block 60 presses the wedge surface 50, it forces the positioning gauge foot 20 and the rotating gauge foot 30 to move away from each other in the axial direction of their hinge axis and to be in close contact with the two side walls of the hinge groove 11.

[0042] In the above structure, the thrust pointing radially toward the hinge axis is converted into the axial thrust of the hinge axis of the positioning gauge foot 20 and the rotating gauge foot 30 to obtain sufficient contact area and positioning friction.

[0043] In this embodiment, the outer wall of the tightening knob 70 is provided with anti-slip texture 72.

[0044] In the above structure, the tightening knob 70 is easy to tighten or loosen.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A wedge-type positioning compass, comprising a connector, the connector having a hinge groove, and further comprising a positioning compass foot and a rotating compass foot, the top of which are located within the hinge groove and hinged together by the connector, wherein the hinge surface between the positioning compass foot and the rotating compass foot is provided with a synchronous positioning piece, characterized in that: The top of both the positioning gauge foot and the rotating gauge foot is provided with a wedge-shaped surface, which is a conical surface, and the rotation axis of its generatrix is ​​coaxial with the hinge axis of both the positioning gauge foot and the rotating gauge foot; the bottom of the hinge groove is provided with a wedge-shaped block adapted to the wedge-shaped surface, and the top of the connector is provided with a clamping knob for pushing the wedge-shaped block to squeeze the wedge-shaped surface.

2. A wedge-type positioning compass according to claim 1, characterized in that: The wedge-shaped surface is located at the junction of the top surface of the positioning gauge foot and the side facing the rotating gauge foot, and at the junction of the top surface of the rotating gauge foot and the side facing the positioning gauge foot; when the tightening knob is tightened, it pushes the wedge block to move towards the hinge axis between the positioning gauge foot and the rotating gauge foot, forcing its two sides to fit and press against each wedge-shaped surface.

3. A wedge-type positioning compass according to claim 1 or 2, characterized in that: The tightening knob engages with the threaded connector.

4. A wedge-type positioning compass according to claim 3, characterized in that: The connector head is provided with a threaded sleeve at the top, and the outer wall of the threaded sleeve is provided with an external thread; the wedge block is provided with a push rod that passes through the threaded sleeve and is exposed; the tightening knob is provided with an internal thread that engages with the external thread, and the bottom of the internal thread hole abuts against the end of the push rod.

5. A wedge-type positioning compass according to claim 4, characterized in that: The end face of the extended end of the push rod is hemispherical.

6. A wedge-type positioning compass according to claim 1, characterized in that: The hinge surfaces between the synchronous positioning plate and the positioning gauge foot and the rotating gauge foot are adapted to the sliding groove by a sliding pin, so that the synchronous positioning plate can be controlled to slide when the positioning gauge foot and the rotating gauge foot open or close; the synchronous positioning plate has a guide hole in the center, and the end of the synchronous positioning plate away from the bottom of the sliding groove has a positioning pin extending towards the wall of the sliding groove; the two walls of the hinge groove have guide grooves adapted to the positioning pin.

7. A wedge-type positioning compass according to claim 6, characterized in that: The major diameter of the guide hole is oriented in its sliding direction or the opening direction of the guide groove; the positioning gauge foot, the rotating gauge foot, and the connector are hinged together by screws, and the screws are set through the guide hole.

8. A wedge-type positioning compass according to claim 6, characterized in that: The sliding grooves are located on both sides of the synchronous positioning piece, and the sliding pins are located on the side of the synchronous positioning piece and the side of the positioning gauge foot facing the synchronous positioning piece, respectively.

9. A wedge-type positioning compass according to claim 1 or 2, characterized in that: When the wedge block presses against the wedge surface, it forces the positioning gauge foot and the rotating gauge foot to move away from each other in the axial direction of their hinge axis and to be in close contact with the two side walls of the hinge groove.

10. A wedge-type positioning compass according to claim 1, characterized in that: The outer wall of the tightening knob is provided with anti-slip texture.

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