Tail-fixed compasses

Abstract

The utility model provides tail-fixed compasses which comprise a positioning compass foot and a rotating compass foot, the tops of the positioning compass foot and the rotating compass foot are mutually hinged through a connector, a synchronous positioning piece is arranged between the hinged faces of the positioning compass foot and the rotating compass foot, and the synchronous positioning piece is matched with the positioning compass foot and the rotating compass foot through sliding pins and sliding grooves. The synchronous positioning sheet is arranged on the positioning compass foot, so that the synchronous positioning sheet is pushed to slide up and down when the positioning compass foot and the rotating compass foot are opened and closed, the synchronous positioning sheet is also provided with a positioning rod which is in sliding fit with the connector, a hooping device is arranged at the top of the connector, the positioning rod penetrates through the connector to reach the hooping device, and the hooping device is used for hooping or loosening the outer wall 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] The utility model relates to stationery or drawing appliance field, concretely relates to a tail fixed compass. BACKGROUND

[0002] The existing compasses adopt gear meshing type or synchronous positioning sheet mode to keep the opening degrees of the two legs consistent when opening and closing, the synchronous positioning sheet slides through the matching of pin and sliding slot when the compass opens and closes, and the sliding matching between the positioning rod and the connecting head ensures the movement track of the synchronous positioning sheet, but the damping (positioning) effect between the two legs of the above two compasses will weaken after long-term use, or the opening angle will change after adjustment due to external force, which affects the normal use of the compass. SUMMARY

[0003] In view of the above problems, the utility model provides a tail fixed compass which can fix the included angle between the positioning leg and the rotating leg.

[0004] In view of the above problems, the utility model provides a tail fixed compass which can fix the included angle between the positioning leg and the rotating leg.

[0005] The utility model further sets up that the hoop tight device includes hoop tight cylinder and hoop tight sleeve which is screwed with hoop tight cylinder, the inner wall of the extension end of hoop tight cylinder is equipped with the close mouth, and the positioning rod is located in the close mouth, the outer wall of the extension end of hoop tight cylinder is equipped with the outer forced tight inclined plane, and the inner wall of hoop tight sleeve is equipped with the inner forced tight inclined plane which is matched with the outer forced tight inclined plane, the extension end of hoop tight cylinder is equipped with a plurality of contraction grooves which are opened along the axial direction and are evenly arranged along the circumferential direction, and the inner forced tight inclined plane pushes the outer forced tight inclined plane to make the contraction groove contract when the hoop tight sleeve is screwed, so that the close mouth clamps the positioning rod.

[0006] The utility model further sets up that the cross section of the positioning rod is circular.

[0007] The utility model further sets up that the outer wall of hoop tight cylinder is equipped with external threads, the inner wall of hoop tight sleeve is equipped with internal threads, and the inner forced tight inclined plane is located at the rear section position of the internal threads.

[0008] The utility model further sets up that the end face of the extension end of the positioning rod is semispherical.

[0009] The utility model further sets up, the hoop sleeve outer wall is equipped with antiskid line.

[0010] The utility model further sets up, the big diameter end of inner forced close bevel faces to inner thread and diameter is equal or less than inner thread big diameter.

[0011] The utility model further sets up, the small diameter end of inner forced close bevel faces away from inner thread and is equipped with the accommodation hole in end part.

[0012] The utility model has the advantages of: through the hoop device of installing on the connector, the extension position of the positioning rod is restricted, so that the included angle between the positioning feet and the rotating feet is kept fixed, avoids the change of the included angle in the use process or the change due to the weakening of the damping (positioning) effect between the positioning feet and the rotating feet after long-term use, effectively guarantees the positioning effect between the positioning feet and the rotating feet. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the three-dimensional structure schematic diagram of the utility model.

[0014] Figure 2 It is the hoop sleeve full section three-dimensional structure schematic diagram of the utility model.

[0015] Figure 3 It is the explosion three-dimensional structure schematic diagram of the utility model.

[0016] Figure 4 It is the positioning feet and rotating feet open state explosion three-dimensional structure schematic diagram of the utility model.

[0017] Figure 5 It is the positioning feet and rotating feet open state local section three-dimensional structure schematic diagram of the utility model.

[0018] The meaning of figure mark: 10-connector;101-hoop cylinder;1011-closing;1012-outer forced close bevel;1013-shrinkage groove;1014-outer thread;11-positioning feet;12-rotating feet;13-synchronous positioning sheet;131-positioning rod;14-hoop sleeve;141-inner forced close bevel;142-inner thread;143-antiskid line;144-accommodation hole. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0020] REFERENCE Figures 1 to 5 For example, Figures 1 to 5The tail fixed compass shown in the figure comprises a positioning compass leg 11 and a rotating compass leg 12 which are hingedly connected to each other at the top through a connecting head 10, a synchronous positioning sheet 13 between the hinge surfaces of the positioning compass leg 11 and the rotating compass leg 12, the synchronous positioning sheet 13 is adapted to the sliding pin and the sliding groove between the positioning compass leg 11 and the rotating compass leg 12 (prior art, not shown in the figure), so that the synchronous positioning sheet 13 slides up and down when the positioning compass leg 11 and the rotating compass leg 12 are opened and closed, the synchronous positioning sheet 13 is further provided with a positioning rod 131 which is slidingly matched with the connecting head 10, the connecting head 10 is provided with a clamping device at the top, the positioning rod 131 passes through the connecting head 10 to reach the clamping device, and the clamping device clamps or relaxes the outer wall of the connecting head 10.

[0021] In the above structure, the extension position of the positioning rod 131 is constrained by the clamping device installed on the connecting head 10, so that the included angle between the positioning compass leg 11 and the rotating compass leg 12 remains fixed, avoiding changes in the included angle during use or changes due to weakening of the damping (positioning) effect between the positioning compass leg 11 and the rotating compass leg 12 after long-term use, effectively ensuring the positioning effect between the positioning compass leg 11 and the rotating compass leg 12.

[0022] In the embodiment, the clamping device comprises a clamping cylinder 101 and a clamping sleeve 14 which is threadedly matched with the clamping cylinder 101, the inner wall of the extension end of the clamping cylinder 101 is provided with a reentrant portion 1011, and the positioning rod 131 is located in the reentrant portion 1011; the outer wall of the extension end of the clamping cylinder 101 is provided with an outer pressing inclined surface 1012, and the inner wall of the clamping sleeve 14 is provided with an inner pressing inclined surface 141 which is adapted to the outer pressing inclined surface 1012; the extension end of the clamping cylinder 101 is provided with a plurality of contraction grooves 1013 which are opened along the axial direction and are uniformly distributed along the circumferential direction; when the clamping sleeve 14 is screwed, the inner pressing inclined surface 141 pushes the outer pressing inclined surface 1012 to make the contraction grooves 1013 contract, forcing the reentrant portion 1011 to clamp the positioning rod 131.

[0023] In the above structure, the clamping cylinder 101 is integrally injection molded with the connecting head 10, and the clamping sleeve 14 is screwed on the clamping cylinder 101 and generates axial displacement by rotation, forcing the inner pressing inclined surface 141 to approach the outer pressing inclined surface 1012, so that the contraction grooves 1013 contract at the same time as the reentrant portion 1011 contracts to clamp the positioning rod 131, thereby limiting the axial displacement of the positioning rod 131 and indirectly ensuring the included angle between the positioning compass leg 11 and the rotating compass leg 12.

[0024] In the embodiment, the cross section of the positioning rod 131 is circular.

[0025] In the above structure, the circular cross section is a preferred scheme, and the cross section of the positioning rod 131 can also be rectangular.

[0026] The outer wall of the hoop cylinder 101 is provided with external thread 1014, the inner wall of the hoop sleeve 14 is provided with internal thread 142, and the inner pressing inclined surface 141 is located at the rear section position of the internal thread 142.

[0027] In the above structure, the inner pressing inclined surface 141 is close to the outer pressing inclined surface 1012 after the thread is screwed.

[0028] In the embodiment, the end face of the extension end of the positioning rod 131 is hemispherical.

[0029] In the above structure, the structure plays a guiding role and facilitates assembly.

[0030] In the embodiment, the outer wall of the hoop sleeve 14 is provided with anti-skid lines 143.

[0031] In the above structure, the anti-skid effect is improved, the hoop sleeve 14 is facilitated to rotate, and the hoop sleeve 14 can also avoid slipping when drawing a circle.

[0032] In the embodiment, the large-diameter end of the inner pressing inclined surface 141 faces the internal thread 142 and has a diameter equal to or smaller than the large-diameter of the internal thread 142.

[0033] In the above structure, the inner pressing inclined surface 141 and the internal thread 142 can have good transition connection.

[0034] In the embodiment, the small-diameter end of the inner pressing inclined surface 141 faces away from the internal thread 142 and is provided with a containing hole 144.

[0035] In the above structure, the containing hole 144 is used to contain the end of the positioning rod 131.

[0036] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and the above assumptions of these improvements and modifications should be regarded as the protection scope of the present application.

Claims

1. A tail-fixed compass, comprising a positioning foot and a rotating foot hinged to each other at the top by a connector, a synchronous positioning piece between the hinged surfaces of the positioning foot and the rotating foot, the synchronous positioning piece being adapted to the positioning foot and the rotating foot via a sliding pin and a sliding groove, so that the positioning foot and the rotating foot push the synchronous positioning piece to slide up and down when the positioning foot and the rotating foot are opened and closed, the synchronous positioning piece also being provided with a positioning rod that slides with the connector, characterized in that: The connecting head top is provided with a clamping device, the positioning rod passes through the connecting head to reach the clamping device, and the clamping device clamps or loosens the outer wall of the connecting head.

2. A tail-stabilized compass according to claim 1, characterized in that: The clamping device comprises a clamping cylinder and a clamping sleeve screwed with the clamping cylinder, the inner wall of the extension end of the clamping cylinder is provided with a necking, and the positioning rod is located in the necking; the outer wall of the extension end of the clamping cylinder is provided with an outer pressing inclined surface, and the inner wall of the clamping sleeve is provided with an inner pressing inclined surface matched with the outer pressing inclined surface; the extension end of the clamping cylinder is provided with a plurality of contraction grooves which are opened along the axial direction and are uniformly arranged along the circumferential direction; when the clamping sleeve is screwed, the inner pressing inclined surface pushes the outer pressing inclined surface to make the contraction grooves contract, and the necking is forced to clamp the positioning rod.

3. A tail-stabilized compass according to claim 1 or 2, characterized in that: The cross section of the positioning rod is circular.

4. A tail-stabilized compass according to claim 2, wherein: The outer wall of the clamping cylinder is provided with an external thread, the inner wall of the clamping sleeve is provided with an internal thread, and the inner pressing inclined surface is located at the rear section position of the internal thread.

5. A tail-stabilized compass according to claim 2, wherein: The end face of the extension end of the positioning rod is hemispherical.

6. A tail-stabilized compass according to claim 2, wherein: The outer wall of the clamping sleeve is provided with anti-skid lines.

7. A tail-stabilized compass according to claim 2, wherein: The large diameter end of the inner pressing inclined surface faces the internal thread and has a diameter equal to or smaller than the large diameter of the internal thread.

8. A tail-stabilized compass according to claim 7, characterized in that: The small diameter end of the inner pressing inclined surface faces away from the internal thread, and the end is provided with a containing hole. The large diameter end of the inner pressing inclined surface faces the internal thread and has a diameter equal to or smaller than the large diameter of the internal thread. The small diameter end of the inner pressing inclined surface faces away from the internal thread, and the end is provided with a containing hole.

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