Wedge type positioning compasses

Abstract

The wedge-type positioning compasses comprise a connector, the connector is provided with a hinge groove, the wedge-type positioning compasses further comprise a positioning compasses leg and a rotating compasses leg, the tops of the positioning compasses leg and the rotating compasses leg are located in the hinge groove and hinged to each other through the connector, and a synchronous positioning piece is arranged on the hinge face between the positioning compasses leg and the rotating compasses leg. 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 compasses have the advantage that the included angle between the positioning compasses leg and the rotating compasses leg can be fixed.

Description

Technical Field

[0001] The invention relates to the field of stationery or drawing tools, and in particular to a wedge-type positioning compass. Background Art

[0002] In order to keep the opening degree of the two legs consistent when opening and closing, the existing compasses adopt a gear meshing type or a synchronous positioning plate method. The synchronous positioning plate will slide through the adaptation of the pin and the slide groove when the compass is opened and closed, and the movement trajectory of the synchronous positioning plate is guaranteed by the sliding cooperation between the positioning rod and the connecting head; however, the damping (positioning) effect between the two legs of the above two compasses will be weakened after long-term use, or after the opening angle adjustment is completed, it is easy to change due to external force, affecting the normal use of the compass. Summary of the invention

[0003] Based on the above problems, the present invention aims to provide a wedge-type positioning compass capable of fixing the angle between the positioning gauge foot and the rotating gauge foot.

[0004] In response to the above problems, the following technical solutions are provided: a wedge-type positioning compass, comprising a connecting head, the connecting head being provided with an articulation groove, and also comprising a positioning gauge foot and a rotating gauge foot, the tops of which are located in the articulation groove and are hinged to each other through the connecting head, the articulation surface between the positioning gauge foot and the rotating gauge foot being provided with a synchronous positioning plate, the tops of both the positioning gauge foot and the rotating gauge foot being provided with a wedge-shaped surface, the wedge-shaped surface being a conical surface, the rotation axis of the generatrix of which is coaxial with the articulation axis of the positioning gauge foot and the rotating gauge foot; a wedge-shaped block matching the wedge-shaped surface is provided at the bottom of the articulation groove, and a tightening knob for pushing the wedge-shaped block to squeeze the wedge surface is provided at the top of the connecting head.

[0005] The present invention is further configured such that the wedge 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, the wedge block is pushed to move toward the hinge axis between the positioning gauge foot and the rotating gauge foot, forcing its two sides to fit and squeeze against the wedge surfaces.

[0006] The present invention is further configured such that the tightening knob is threadably matched with the connecting head.

[0007] The present invention is further configured such that a threaded sleeve is provided on the top of the connector, and an external thread is provided on the outer wall of the threaded sleeve; the wedge block is provided with a push rod passing through the threaded sleeve and exposed outside; the tightening knob is provided with an internal thread screwed 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 surface of the push rod extension end is hemispherical.

[0009] The present invention is further configured such that the synchronous positioning piece and the hinged surfaces between the positioning gauge foot and the rotating gauge foot are adapted through a sliding pin and a sliding groove, so that the synchronous positioning piece is controlled to slide when the positioning gauge foot and the rotating gauge foot are opened or closed; a guide hole is provided in the center of the synchronous positioning piece, and a positioning pin extending toward the groove wall of the groove is provided at one end of the synchronous positioning piece away from the bottom of the groove; and guide grooves adapted to the positioning pins are provided on both groove walls of the hinge groove.

[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 connecting head are hinged by screws, and the screws are arranged through the guide hole.

[0011] The present invention is further configured such that the slide grooves are located on both sides of the synchronous positioning piece, and the slide pins are respectively located on the synchronous positioning piece and on a surface of the positioning gauge foot facing the synchronous positioning piece.

[0012] The present invention is further configured such that when the wedge block squeezes the wedge surface, the positioning gauge foot and the rotating gauge foot are forced to move away from each other in the axial direction of the hinge axis of the two and to cling to the two side walls of the hinge groove.

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

[0014] The beneficial effect of the present invention is that the wedge block is pushed against the wedge surface of the positioning gauge foot and the rotating gauge foot by tightening or loosening the tightening knob, thereby providing friction force to fix the positioning gauge foot and the rotating gauge foot. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the positioning gauge foot and the rotating gauge foot of the present invention in the open state.

[0017] Figure 3 For the present invention Figure 1 Schematic diagram of the full cutaway three-dimensional structure of the connector.

[0018] Figure 4 For the present invention Figure 1 Schematic diagram of the full cutaway three-dimensional structure of the positioning gauge foot, rotating gauge foot and connecting head.

[0019] Figure 5 For the present invention Figure 2 Schematic diagram of the full cutaway three-dimensional structure of the connector.

[0020] Figure 6 For the present invention Figure 2 Schematic diagram of the full cutaway three-dimensional structure of the positioning gauge foot, rotating gauge foot and connecting head.

[0021] Figure 7 It is a schematic diagram of the exploded three-dimensional structure from the first perspective of the present invention.

[0022] Figure 8 It is a schematic diagram of the exploded three-dimensional structure from a second viewing angle of the present invention.

[0023] Meaning of the numbers in the figure: 10-connector; 101-screw; 102-external thread; 11-hinge groove; 111-guide groove; 20-locating gauge foot; 30-rotating gauge foot; 40-synchronous positioning plate; 41-slide groove; 42-guide hole; 43-locating pin; 50-wedge surface; 51-slide pin; 60-wedge block; 61-push rod; 70-tightening knob; 71-internal thread; 72-anti-slip pattern; 80-screw. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] refer to Figures 1 to 8 ,like Figures 1 to 8 A wedge-type positioning compass shown in the figure includes a connecting head 10, the connecting head 10 is provided with an articulation groove 11, and also includes a positioning gauge foot 20 and a rotating gauge foot 30 whose tops are located in the articulation groove 11 and are hinged to each other through the connecting head 10, the hinge surface between the positioning gauge foot 20 and the rotating gauge foot 30 is provided with a synchronous positioning piece 40, the tops of both the positioning gauge foot 20 and the rotating gauge foot 30 are provided with a wedge surface 50, the wedge surface 50 is a conical surface, the rotation axis of its generatrix is ​​coaxial with the articulation axis of both the positioning gauge foot 20 and the rotating gauge foot 30 (to ensure that the wedge surface 50 can cooperate well with the wedge block 60 at any angle of the positioning gauge foot 20 and the rotating gauge foot 30); a wedge block 60 adapted to the wedge surface 50 is provided at the bottom of the articulation groove 11, and a tightening knob 70 for pushing the wedge block 60 to squeeze the wedge surface 50 is provided at the top of the connecting head 10.

[0026] In the above structure, the wedge block 60 is pushed to adapt to the wedge surface 50 by the tightening knob 70, so as to fix the opening angle of the positioning gauge foot 20 and the rotating gauge foot 30, which has the advantages of simple overall structure, large contact friction, and stable fixation; when the tightening knob 70 is loosened, the wedge block 60 is automatically loosened 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 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, the wedge block 60 is pushed toward the hinge axis direction between the positioning gauge foot 20 and the rotating gauge foot 30 to force its two sides to fit and squeeze against the wedge surfaces 50.

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

[0029] In this embodiment, the tightening knob 70 is threadably matched with the connector 10 .

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

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

[0032] In the above structure, the push rod 61 is used to provide a guide for the sliding of the wedge block 60 , and at the same time serves as a support member to abut against the bottom of the internal thread 71 of the screw sleeve 101 .

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

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

[0035] In this embodiment, the hinged surfaces between the synchronous positioning piece 40 and the positioning gauge foot 20 and the rotating gauge foot 30 are adapted to the slide groove 41 through the sliding pin 51, so that the synchronous positioning piece 40 can be controlled to slide when the positioning gauge foot 20 and the rotating gauge foot 30 are opened or closed; a guide hole 42 is provided at the center of the synchronous positioning piece 40, and a positioning pin 43 extending toward the groove wall of the groove 41 is provided at one end of the synchronous positioning piece 40 away from the bottom of the groove 41; the two groove 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 piece 40 is adapted between the positioning gauge foot 20 and the rotating gauge foot 30 through the sliding pin 51 and the sliding groove 41 to achieve synchronous opening and closing of the two; the traditional synchronous positioning piece 40 limits its sliding direction through the guide rod. Since the position of the guide rod in this solution is occupied by the push rod 61, it is necessary to achieve guidance 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 connecting head 10 are hingedly connected by a screw 80 , and the screw 80 is set 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 cooperate with the guide hole 42 and the screw 80 to constrain the sliding direction of the synchronous positioning piece 40 .

[0039] In this embodiment, the slide grooves 41 are located on both sides of the synchronous positioning piece 40 , and the slide pins 51 are respectively located on the synchronous positioning piece 40 and on a surface of the positioning foot 20 facing the synchronous positioning piece 40 .

[0040] The above structure is the prior art of synchronous opening and closing.

[0041] In this embodiment, when the wedge block 60 squeezes the wedge surface 50 , the positioning gauge foot 20 and the rotating gauge foot 30 are forced to move away from each other in the axial direction of the hinge axis of the two and to cling to the two side walls of the hinge groove 11 .

[0042] In the above structure, the thrust directed to the radial direction of 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 grooves 72 .

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

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the scope of protection of the present invention.

Claims

1. A wedge-type positioning compass, comprising a connector, the connector having an articulation groove, and a positioning gauge foot and a rotating gauge foot whose tops are located in the articulation groove and are mutually articulated through the connector, wherein the articulation surface between the positioning gauge foot and the rotating gauge foot is provided with a synchronous positioning piece, characterized in that: A wedge-shaped surface is provided at the top of both the positioning gauge foot and the rotating gauge foot. The wedge-shaped surface 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. 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 squeeze the wedge surface is provided at the top of the connecting head.

2. A wedge-type positioning compass according to claim 1, characterized in that: The wedge 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, the wedge block is pushed toward the hinge axis between the positioning gauge foot and the rotating gauge foot, forcing its two sides to fit and squeeze with the wedge surfaces.

3. A wedge-type positioning compass according to claim 1 or 2, characterized in that: The tightening knob is matched with the connecting head thread.

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

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

6. A wedge-type positioning compass according to claim 1, characterized in that: The synchronous positioning piece and the hinged surfaces between the positioning gauge foot and the rotating gauge foot are matched with the sliding pin and the sliding groove, so that the synchronous positioning piece can be controlled to slide when the positioning gauge foot and the rotating gauge foot are opened or closed; a guide hole is provided in the center of the synchronous positioning piece, and a positioning pin extending toward the groove wall of the groove is provided at one end of the synchronous positioning piece away from the bottom of the groove; guide grooves matching the positioning pins are provided on both groove walls of the hinge groove.

7. A wedge-type positioning compass according to claim 6, characterized in 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 connecting head are hinged by screws, and the screws are arranged through the guide hole.

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

9. A wedge-type positioning compass according to claim 1 or 2, characterized in that: When the wedge block squeezes the wedge surface, the positioning gauge foot and the rotating gauge foot are forced to move away from each other in the axial direction of the hinge axis of the two and to be close to 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 grooves.

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