A detachable self-preloaded buckle

Abstract

The present invention discloses a detachable self-preloaded buckle, characterized in that it comprises: a connecting pillar, the connecting pillar is set as a hollow structure, a rotating sleeve is matched and inserted in the connecting pillar, and the rotating sleeve is fixed to the connecting pillar by a cylindrical pin; a turntable, the turntable is fixedly welded on the outer wall at the top of the connecting pillar; a mounting plate, the top of the plug shaft is fixedly welded on the bottom surface of the mounting plate, and the bottom end of the plug shaft can slide in the rotating sleeve and along the axis of the rotating sleeve. In the device of the present invention, the plug shaft and the rotating sleeve are fixed by hole-shaft matching, so that the upper and lower parts of the buckle cannot move forward, backward, left and right relative to each other, and cannot rotate along the X-axis and Y-axis in the horizontal direction, leaving only two degrees of freedom of relative up and down movement along the vertical axis and rotation around the vertical axis. When the buckle is locked, the relative up and down movement between the upper and lower parts of the buckle is limited, and the relative rotation around the vertical axis is limited. Therefore, after the buckle is locked, the six degrees of freedom of the upper and lower parts are all limited to be relatively fixed.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of buckles, in particular to a detachable self-pretightening buckle. Background Art

[0002] Buckles are often used for fastening in existing seats, but the existing buckle assembly and disassembly steps are relatively cumbersome and difficult to achieve quick disassembly. Therefore, it is necessary to propose a detachable self-pretightening buckle to solve the above problem. Summary of the invention

[0003] To achieve the above object, the present invention provides the following technical solution: a detachable self-pretightening buckle, characterized in that it comprises:

[0004] A connecting pillar, wherein the connecting pillar is configured as a hollow structure, a rotating sleeve is matched and inserted into the connecting pillar, and the rotating sleeve is fixed to the connecting pillar by a cylindrical pin;

[0005] A turntable, the turntable is fixedly welded to the outer side wall of the top of the connecting support;

[0006] A mounting plate, the bottom surface of which is fixedly welded with the top end of the plug shaft, and the bottom end of the plug shaft can slide in the rotating sleeve and along the axis direction of the rotating sleeve;

[0007] And an upper buckle assembly, the upper buckle assembly is fixedly welded on the bottom surface of the mounting plate, and the upper buckle assembly can be engaged with the turntable to fix the mounting plate and the connecting pillar.

[0008] Further, preferably, the outer diameter of the plug shaft is the same as the inner diameter of the rotating sleeve.

[0009] Further, preferably, a plurality of limiting notches are provided on the side wall of the turntable.

[0010] Further, as a preference, the upper buckle assembly comprises a backing plate, a mounting sheet metal, a shift fork torsion spring, a shift fork and a handle bar, the backing plate is fixedly welded to the bottom surface of the mounting plate, and the bottom surface of the backing plate is fixedly welded with a mounting sheet metal;

[0011] One end of the handle rod is set as a threaded end, and the threaded end extends into the axial hole of the fork and passes through the left side wall of the mounting sheet metal, and then is threadedly connected with the anti-loosening nut, and the handle rod is fixedly connected to the fork with a cylindrical head hexagon socket bolt, and a matching sleeve is provided on the outer side wall of the left part of the fork with a fork torsion spring, the rear end of the fork torsion spring is fixed on the mounting sheet metal, and a bent buckle is provided at the front end of the fork torsion spring, and the bent buckle is tightly buckled on the fork.

[0012] Further, as a preference, a wedge-shaped surface is provided on the shift fork, and the wedge-shaped surface can be matched and snapped onto any limiting notch of the turntable.

[0013] Further, as a preference, nylon washers are provided between the anti-loosening nut and the left outer side surface of the mounting sheet metal and between the shift fork torsion spring and the left inner side surface of the mounting sheet metal.

[0014] Further, as a preference, a handle is fixedly provided at one end of the handle rod away from the shift fork.

[0015] The present invention adopts the above technology and has the following beneficial effects compared with the existing technology:

[0016] 1. In the device of the present invention, the insertion shaft and the rotating sleeve are fixed by hole-shaft matching, so that the upper and lower parts of the buckle cannot move forward, backward, left, right, or rotate along the horizontal X-axis and Y-axis, leaving only two degrees of freedom: relative up and down movement along the vertical axis and rotation around the vertical axis. When the buckle is locked, the relative up and down movement between the upper and lower parts of the buckle is restricted, and the relative rotational movement around the vertical axis is restricted. Therefore, after the buckle is locked, the six degrees of freedom of the upper and lower parts are restricted and relatively fixed.

[0017] 2. When the buckle is released, the shift fork disengages from the limit notch on the turntable, the buckle is released, and the upper and lower parts of the buckle can rotate around the axis of the plug shaft. Since there are multiple limit notches on the turntable, when it rotates to the next limit notch, the shift fork torsion spring will automatically snap into the limit notch under the action of the torsion force, thereby returning to the clamped state, but at this time the upper and lower parts of the buckle are rotated relative to each other at an angle.

[0018] 3. In the device of the present invention, when the buckle is in a clamped state, the handle can be rotated upward to disengage the shift fork from the limiting notch of the turntable, and the upper and lower parts of the buckle can be pulled apart by force, so the disassembly process is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a three-dimensional structure of a detachable self-pretightening buckle;

[0020] Figure 2 It is a schematic diagram of the front view structure of a detachable self-pretightening buckle;

[0021] Figure 3 It is a structural schematic diagram of a detachable self-pretightening buckle middle and upper buckle assembly;

[0022] Figure 4 Schematic diagram of the force analysis of the rotating disk and the fork in a detachable self-preloaded buckle Figure 1 ;

[0023] Figure 5 Schematic diagram of the force analysis of the turntable and fork in a detachable self-preloaded buckle Figure 2 ;

[0024] Figure 6 It is a structural schematic diagram of a handle rod in a detachable self-pretightening buckle;

[0025] Figure 7 It is a structural cross-sectional view of an upper buckle assembly in a detachable self-pretightening buckle;

[0026] Figure 8 This is a force analysis diagram of the shift fork on the turntable in a detachable self-preloaded buckle;

[0027] Fig. 9 It is a schematic diagram of a clamping state of a detachable self-pretightening buckle;

[0028] Fig.10 It is a schematic diagram of a release state of a detachable self-pretightening buckle;

[0029] Fig.11 A disassembly diagram of a detachable self-pretightening buckle;

[0030] Fig.12 The figure is a schematic diagram of the assembly of a detachable self-tightening buckle.

[0031] In the figure: 1. Mounting plate; 2. Backing plate; 3. Mounting sheet metal; 4. Anti-loosening nut; 5. Nylon gasket; 6. Fork torsion spring; 7. Cylindrical head hexagon socket bolt; 8. Fork; 9. Turntable; 10. Rotating sleeve; 11. Insert shaft; 12. Connecting support; 13. Cylindrical pin; 14. Handle; 15. Handle rod; 21. Limiting notch; 22. Wedge surface; 23. Bend buckle; 24. Tightening notch; 25. Threaded end. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example: Please refer to the attached Figure 1-12 The present invention provides a technical solution: a detachable self-preloaded buckle, comprising:

[0034] A connecting pillar 12, which is configured as a hollow structure, into which a rotating sleeve 10 is inserted, and the rotating sleeve 10 and the connecting pillar 12 are fixed by a cylindrical pin 13;

[0035] A turntable 9, which is fixedly welded to the outer side wall of the top of the connecting support 12;

[0036] The mounting plate 1 has a top end of an insert shaft 11 fixedly welded to the bottom surface of the mounting plate 1, and the bottom end of the insert shaft 11 can slide in the rotating sleeve 10 and along the axis direction of the rotating sleeve 10;

[0037] And an upper buckle assembly, which is fixedly welded on the bottom surface of the mounting plate 1 and can be engaged with the turntable 9 to fix the mounting plate 1 and the connecting pillar 12.

[0038] In this embodiment, the outer diameter of the insertion shaft 11 is the same as the inner diameter of the rotating sleeve 10;

[0039] Specifically, the plug shaft 11 and the rotating sleeve 10 are fixed by hole-shaft matching, so that the upper and lower parts of the buckle cannot move relative to each other, and cannot be separated up and down in the buckle locking state, so the relative movement between the upper and lower parts of the buckle is only the rotation around the axis of the plug shaft 11;

[0040] Please see attached Fig. 9 When the buckle is released, the shift fork is separated from the limit notch on the turntable. Please refer to the state shown in Figure 10. After the buckle is released, the upper and lower parts of the buckle can rotate around the axis of the plug shaft. Since there are multiple limit notches on the turntable, when it rotates to the next limit notch, the shift fork torsion spring will automatically snap into the limit notch under the action of the torsion force, thereby returning to the clamped state, but at this time the upper and lower parts of the buckle are rotated relative to each other by an angle.

[0041] In this embodiment, a plurality of limiting notches 21 are provided on the side wall of the rotating disk 9 .

[0042] In this embodiment, the upper buckle assembly includes a backing plate 2, a mounting sheet metal 3, a shift fork torsion spring 6, a shift fork 8 and a handle bar 15. The backing plate 2 is fixedly welded to the bottom surface of the mounting plate 1, and the mounting sheet metal 3 is fixedly welded to the bottom surface of the backing plate 2;

[0043] One end of the handle bar 15 is set as a threaded end 25, the threaded end 25 extends into the shaft hole of the fork 8, and passes through the left side wall of the mounting sheet metal 3, and then is threadedly connected with the anti-loosening nut 4, and the handle bar 15 is fixedly connected with the fork 8 by a cylindrical head hexagon socket bolt 7, and a matching sleeve of a fork torsion spring 6 is provided on the outer side wall of the left part of the fork 8, the rear end of the fork torsion spring 6 is fixed on the mounting sheet metal 3, and the front end of the fork torsion spring 6 is provided with a bent buckle 23, and the bent buckle 23 is tightly buckled on the fork 8;

[0044] Specifically, a clamping notch 24 is provided on the handle bar 15, and the cylindrical head hexagon socket bolt 7 is locked on the clamping notch 24, so that the shift fork is connected to the handle bar.

[0045] In this embodiment, a wedge-shaped surface 22 is provided on the shift fork 8, and the wedge-shaped surface 22 can be matched and snapped on any limiting notch 21 of the rotating disk 9;

[0046] Please refer to the attached Figure 8 When the shift fork 8 is stuck in the limit notch 21 of the rotating disk 9, the torque t of the shift fork torsion spring on the shift fork 0 The force generated is F 3 Since the force between the fork wedge surface and the rotating disc limit notch needs to be perpendicular to the wedge surface, the force is divided into F 4 and F 4 ', and its vertical component is The horizontal force component is F 5 , according to the principle of mechanics, we can get F 5 equal Since & is close to 90 degrees, Much larger than F 3 , because there is a large force F between the shift fork and the limit gap of the turntable 5 , press the shift fork tightly against both sides of the limit notch of the turntable so that the two are tightly connected without relative movement, thereby making it impossible for the upper buckle assembly and the lower buckle assembly to rotate relative to each other;

[0047] Since the shift fork is fixed to the mounting sheet metal of the upper part of the buckle and relatively fixed to the turntable of the lower part of the buckle, the upper and lower parts of the buckle are tightly connected without shaking when clamped, and the shift fork torsion spring provides pre-tightening force in real time to play an expected anti-loosening effect.

[0048] In this embodiment, nylon washers 5 are provided between the anti-loosening nut 4 and the left outer side surface of the mounting sheet metal 3 and between the shift fork torsion spring 6 and the left inner side surface of the mounting sheet metal 3 .

[0049] In this embodiment, a handle 14 is fixedly provided at one end of the handle rod 15 away from the shift fork 8 .

[0050] The buckle-fastening principle of the device of the present invention: Please refer to the attached Figure 4 , the buckle needs to be disengaged normally by pushing the handle upwards. When the handle is not pushed and the buckle is to be forcibly disassembled, a downward force F is applied to the lower part of the buckle and an upward force F' is applied to the upper part of the buckle; because the upper and lower parts of the buckle are connected vertically by a turntable and a fork, the turntable will apply a downward force F to the fork. Since the turntable and the fork are symmetrical in shape, the two sides of the limit notch of the turntable will apply a force to the fork respectively. Since the force between the point and the surface is always perpendicular to the surface, the fork is subjected to two pressures F perpendicular to the contact surface at the contact points on both sides of the turntable. 2 and F 2 ', and F 2 and F 2 The vertical downward force is According to the principle of mechanics, F 2 equal The horizontal force F on the fork 1 and F 1 'Equal in magnitude and opposite in direction, they cancel each other out. The vertical downward force on the fork is is F;

[0051] Please see attached Figure 5 If you want to forcibly remove the buckle, you need to rotate the shift fork clockwise to disengage the limit notch of the turntable. The downward force F exerted by the turntable on the shift fork is the main driving force for the clockwise rotation of the shift fork. Its force arm is the distance L from the handlebar axis to the contact point between the shift fork and the limit notch. The torque generated is F·L.

[0052] Pressure F between fork and turntable 2 and F 2 The maximum friction force that can be generated is (F 2 +F 2 ')·μ (μ is the friction coefficient between the fork and the turntable), the resistance torque generated by this force is (F 2 +F 2 ·)·μ·L, and the counterclockwise torque exerted by the torsion spring on the fork is t 0 ;

[0053] The fork will rotate counterclockwise around the handlebar axis only when the dynamic torque is greater than the sum of the friction resistance torque and the torsion spring torque.

[0054] F·L>(F 2 +F 2' )·μ·L+t 0

[0055]

[0056]

[0057] When designing, & is close to 90°, cos& is close to 0, Approaching infinity, we get:

[0058]

[0059] Therefore, the above inequality does not hold. Therefore, no matter how large the force F is, the shift fork cannot rotate clockwise to disengage from the limit notch of the turntable, and the buckle cannot be forcibly removed. Therefore, the clamping is firm and reliable.

[0060] The disassembly steps of the device of the present invention are as follows: when the buckle is in a clamped state, the handle is rotated upward to make the shift fork disengage from the limiting notch of the turntable, and the upper and lower parts of the buckle can be pulled apart by force, and the disassembly process is convenient and quick.

[0061] The assembly steps of the device of the present invention are: align the insertion shaft with the rotating sleeve and insert it. When the fork is about to reach the turntable position, the handle needs to be rotated upward so that the fork can pass from the outside of the turntable, and then continue to insert it downward until the rotating sleeve and the mounting plate are connected, and then rotate the upper part of the buckle to make the fork clamped on the corresponding limit notch to complete the assembly.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detachable self-preloaded buckle, characterized in that: It includes: A connecting pillar (12), wherein the connecting pillar (12) is configured as a hollow structure, a rotating sleeve (10) is inserted into the connecting pillar (12), and the rotating sleeve (10) and the connecting pillar (12) are fixed by a cylindrical pin (13); A rotating disk (9), wherein the rotating disk (9) is fixedly welded to the outer side wall of the top of the connecting support (12); A mounting plate (1), wherein the bottom surface of the mounting plate (1) is fixedly welded to the top end of the insertion shaft (11), and the bottom end of the insertion shaft (11) is capable of sliding inside the rotating sleeve (10) and along the axis direction of the rotating sleeve (10); and an upper buckle assembly, the upper buckle assembly being fixedly welded on the bottom surface of the mounting plate (1), the upper buckle assembly being capable of engaging with the rotating disk (9) to fix the mounting plate (1) and the connecting pillar (12); A plurality of limiting notches (21) are provided on the side wall of the rotating disk (9); The upper buckle assembly comprises a backing plate (2), a mounting sheet metal (3), a shift fork torsion spring (6), a shift fork (8) and a handle bar (15); the backing plate (2) is fixedly welded to the bottom surface of the mounting plate (1); and the mounting sheet metal (3) is fixedly welded to the bottom surface of the backing plate (2); One end of the handle bar (15) is provided as a threaded end (25), the threaded end (25) extends into the shaft hole of the shift fork (8), passes through the left side wall of the mounting sheet metal (3), and is then threadedly connected to the anti-loosening nut (4), and the handle bar (15) is fixedly connected to the shift fork (8) by a cylindrical head hexagon socket bolt (7), a shift fork torsion spring (6) is matched and sleeved on the outer side wall of the left part of the shift fork (8), the rear end of the shift fork torsion spring (6) is fixed on the mounting sheet metal (3), and the front end of the shift fork torsion spring (6) is provided with a bent buckle (23), and the bent buckle (23) is tightly buckled on the shift fork (8); The shift fork (8) is provided with a wedge-shaped surface (22), and the wedge-shaped surface (22) can be matched and snapped onto any limiting notch (21) of the rotating disk (9).

2. A detachable self-prestressing buckle according to claim 1, characterized in that: The outer diameter of the insertion shaft (11) is the same as the inner diameter of the rotating sleeve (10).

3. The detachable self-prestressing buckle according to claim 1, characterized in that: Nylon washers (5) are provided between the anti-loosening nut (4) and the outer side surface of the left mounting sheet metal (3) and between the shift fork torsion spring (6) and the inner side surface of the left mounting sheet metal (3).

4. The detachable self-pretightening buckle according to claim 1, characterized in that: A handle (14) is fixedly provided at one end of the handle rod (15) away from the shift fork (8).

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