Self-locking safety buckle

Abstract

The invention belongs to the technical field of safety buckles, and relates to a self-locking safety buckle which comprises a buckle body, a locking arm and a buckle ring, a hook-shaped arm is arranged at the upper end of the buckle body, the tail end of the locking arm is rotationally connected with the buckle body, the front end of the locking arm is clamped at the front end of the hook-shaped arm, an unlocking piece is arranged on the outer side of the hook-shaped arm and rotationally connected with the hook-shaped arm through a first rotating shaft, and the buckle ring is arranged on the hook-shaped arm. A limiting rod and a reset spring are arranged in the buckle body, the limiting rod is rotationally arranged in the buckle body, a spring bolt part and an abutting part are arranged at the upper end and the lower end of the limiting rod respectively, the front end of the spring bolt part protrudes out of the inner side wall of the hook-shaped arm, the abutting part abuts against the unlocking piece, a self-locking torsional spring is arranged on the locking arm, and the tail end of the self-locking torsional spring is arranged on the locking arm. The front end of the self-locking torsional spring abuts against the bottom of the front end of the spring bolt part so as to prevent the lock arm from rotating. The self-locking and unlocking mechanism is arranged on the buckle body, the locking arm has a self-locking function, when the safety buckle is unlocked and opened, the unlocking piece and the locking arm are pressed at the same time, and the safety buckle is simple, practical and high in safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of safety fasteners, and particularly relates to a self-locking safety fastener. Background Art

[0002] Existing safety fasteners with spring-return lock arms do not have a self-locking function and have poor safety. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a self-locking safety fastener, in which the lock arm of the safety fastener has a self-locking function and high safety.

[0004] The present invention is implemented as follows: A self-locking safety fastener is provided, which includes a buckle body, a lock arm and a buckle ring. The buckle ring is arranged at the lower end of the buckle body. A hook-shaped arm is arranged at the upper end of the buckle body. A rope-passing opening is arranged between the front end of the hook-shaped arm and the buckle body. The end of the lock arm is rotatably connected to the buckle body. The front end of the lock arm is clamped at the front end of the hook-shaped arm. An unlocking member is arranged on the outer side of the hook-shaped arm. The unlocking member is rotatably connected to the hook-shaped arm through a first rotating shaft. A limiting rod and a return spring are respectively arranged in the buckle body. The limiting rod is rotatably arranged in the buckle body. A locking tongue portion and an abutting portion are respectively arranged at the upper and lower ends of the limiting rod. The front end of the locking tongue portion protrudes outside the inner side wall of the hook-shaped arm. The abutting portion abuts against the unlocking member. A self-locking torsion spring is arranged on the lock arm. The end of the self-locking torsion spring is arranged on the lock arm. The front end of the self-locking torsion spring abuts against the bottom of the front end of the locking tongue portion to prevent the lock arm from rotating.

[0005] Further, a straight section is arranged at the front end of the self-locking torsion spring, and the straight section abuts against the bottom of the front end of the locking tongue portion to prevent the lock arm from rotating.

[0006] Further, a second rotating shaft is further arranged on the buckle body. The limiting rod is rotatably connected to the buckle body through the second rotating shaft. The locking tongue portion and the abutting portion are respectively located on the upper and lower sides of the second rotating shaft.

[0007] Further, a rotating portion is further arranged on the limiting rod. A rotating groove is arranged in the buckle body. The rotating portion rotates along the inner wall of the rotating groove. The locking tongue portion and the abutting portion are respectively located on the upper and lower sides of the rotating portion.

[0008] Further, an inclined section is arranged at the front end of the locking tongue portion. The length of the upper part of the inclined section protruding from the inner side wall of the hook-shaped arm is less than the length of the bottom of the inclined section protruding from the inner side wall of the hook-shaped arm.

[0009] Further, a first arc section is arranged at the connection between the inclined section and its upper part, and a second arc section is arranged at the connection between the inclined section and its bottom.

[0010] Further, a third rotating shaft is further arranged on the buckle body. The end of the lock arm is rotatably connected to the buckle body through the third rotating shaft.

[0011] Further, a T-shaped groove and a limiting portion are respectively arranged at the end of the locking arm, and a T-shaped portion is arranged at the front end of the hook-shaped arm. The T-shaped portion is located in the T-shaped groove and is blocked by the limiting portion.

[0012] Compared with the prior art, the self-locking safety buckle of the present invention includes a buckle body, a locking arm and a buckle ring. A hook-shaped arm is arranged at the upper end of the buckle body. The end of the locking arm is rotatably connected to the buckle body. The front end of the locking arm is locked at the front end of the hook-shaped arm. An unlocking member is arranged on the outer side of the hook-shaped arm. The unlocking member is rotatably connected to the hook-shaped arm through a first rotating shaft. A limiting rod and a reset spring are respectively arranged in the buckle body. The limiting rod is rotatably arranged in the buckle body. A locking tongue portion and an abutting portion are respectively arranged at the upper and lower ends of the limiting rod. The front end of the locking tongue portion protrudes outside the inner side wall of the hook-shaped arm. The abutting portion abuts against the unlocking member. A self-locking torsion spring is arranged on the locking arm. The end of the self-locking torsion spring is arranged on the locking arm. The front end of the self-locking torsion spring abuts against the bottom of the front end of the locking tongue portion to prevent the locking arm from rotating. The present invention arranges a self-locking and unlocking mechanism on the buckle body, so that the locking arm has a self-locking function. When the safety buckle is unlocked and opened, the unlocking member and the locking arm are pressed simultaneously, which is simple and practical and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective schematic view of the self-locking safety buckle of the present invention in a self-locking closed state; Figure 2 is Figure 1 a perspective schematic view of the self-locking safety buckle in an unlocked and open state; Figure 3 is a cross-sectional view of an embodiment of the self-locking safety buckle of the present invention in a self-locking closed state; Figure 4 is Figure 3 a cross-sectional view of the self-locking safety buckle embodiment in the above figure in an unlocked and open state; Figure 5 is a cross-sectional schematic view of another embodiment of the self-locking safety buckle of the present invention in a self-locking closed state; Figure 6 is Figure 5 a cross-sectional view of the self-locking safety buckle embodiment in the above figure in an unlocked and open state.

[0014] Each label in the figure is respectively: 1, buckle body; 2, locking arm; 21, T-shaped groove; 22, limiting portion; 3, buckle ring; 4, hook-shaped arm; 41, T-shaped portion; 5, unlocking member; 6, first rotating shaft; 7, limiting rod; 71, locking tongue portion; 72, abutting portion; 73, rotating portion; 74, inclined section; 75, first arc section; 76, second arc section; 8, reset spring; 9, self-locking torsion spring; 91, straight section; 10, second rotating shaft; 11, third rotating shaft; A, rope passing opening; B, rope receiving hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] Please refer to Figures 1 to 4 As shown, a preferred embodiment of the self-locking safety buckle of the present invention includes a buckle body 1, a locking arm 2 and a buckle ring 3. The buckle ring 3 is arranged at the lower end of the buckle body 1, and a hook-shaped arm 4 is arranged at the upper end of the buckle body 1. The hook-shaped arm 4 is integrally connected with the buckle body 1. There is a rope passing opening A between the front end of the hook-shaped arm 4 and the buckle body 1. When the rope passing opening A is in an open state, the rope connected to the hook-shaped arm 4 passes through the rope passing opening A. The end of the locking arm 2 is rotatably connected to the buckle body 1, and the front end of the locking arm 2 is locked to the front end of the hook-shaped arm 4. Under the action of an external force, the locking arm 2 rotates inwardly towards the hook-shaped arm 4.

[0017] An unlocking member 5 is arranged on the outer side of the hook-shaped arm 4, and the unlocking member 5 is rotatably connected to the hook-shaped arm 4 through a first rotating shaft 6. A limiting rod 7 and a return spring 8 are respectively arranged in the buckle body 1, and the limiting rod 7 is rotatably arranged in the buckle body 1. A locking tongue portion 71 and an abutting portion 72 are respectively arranged at the upper and lower ends of the limiting rod 7. The front end of the locking tongue portion 71 protrudes to the outside of the inner side wall of the hook-shaped arm 4, and the abutting portion 72 protrudes from the outer side wall of the buckle body 1 and abuts against the unlocking member 5. A self-locking torsion spring 9 is arranged on the locking arm 2. The end of the self-locking torsion spring 9 is arranged on the locking arm 2, and the front end of the self-locking torsion spring 9 abuts against the bottom of the front end of the locking tongue portion 71 to prevent the locking arm 2 from rotating. A straight section 91 is provided at the front end of the self-locking torsion spring, and the straight section 91 abuts against the bottom of the front end of the locking tongue portion 71 to prevent the locking arm 2 from rotating.

[0018] Under normal conditions, neither the locking arm 2 nor the unlocking member 5 is affected by an external force. Under the action of the return spring 8, the abutting portion 72 abuts against the unlocking member 5, and the front end of the locking tongue portion 71 protrudes to the outside of the inner side wall of the hook-shaped arm 4; under the action of the self-locking torsion spring 9, the front end of the locking arm 2 is locked to the front end of the hook-shaped arm 4, and the straight section 91 of the self-locking torsion spring 9 abuts against the bottom position of the front end of the locking tongue portion 71. The straight section 91 cannot move up any further, the rope passing opening A is in a closed state, the locking arm 2 cannot be pressed to rotate inwardly towards the hook-shaped arm 4, and the safety buckle is in a self-locking state.

[0019] After the unlocking member 5 is pressed, the unlocking member 5 touches the abutting portion 72 to make it rotate into the buckle body 1. The abutting portion 72 drives the locking tongue portion 71 to rotate. The front end of the locking tongue portion 71 retracts into the hook-shaped arm 4 and no longer blocks the straight section 91 of the self-locking torsion spring 9. The unlocking member 5 is in an unlocked state; after the locking arm 2 is pressed, the locking arm 2 rotates inwardly towards the hook-shaped arm 4, and the straight section 91 slides upward along the inner side wall of the hook-shaped arm 4, and the rope passing opening A gradually opens, and the safety buckle is in an open state.

[0020] When the external force pressing the lock arm 2 and the unlocking member 4 disappears, under the action of the reset spring 8, the abutting portion 72 drives the unlocking member 5 and the locking tongue portion 71 to reset respectively. The front end of the locking tongue portion 71 protrudes outside the inner side wall of the hook-shaped arm 4. Under the action of the self-locking torsion spring 9, the lock arm 2 resets and drives the straight section 91 to move downward. The straight section 91 of the self-locking torsion spring 9 abuts against the bottom position of the locking tongue portion 71, the rope passing opening A closes, and the safety buckle returns to the self-locking state.

[0021] A rope receiving hole B is formed between the lock arm 2 and the inner side wall of the hook-shaped arm 4. The rope passing opening A is communicated with the rope receiving hole B. When the rope passing opening A is in an open state, the rope passes in and out of the rope receiving hole B through the rope passing opening A, and the rope is connected to the hook-shaped arm 4. Another section of rope is arranged in the buckle 3, and the two sections of rope are connected to each other through the self-locking safety buckle.

[0022] As an embodiment of the present invention, a second rotating shaft 10 is further arranged on the buckle body 1. The limiting rod 7 is rotatably connected to the buckle body 1 through the second rotating shaft 10, and the locking tongue portion 71 and the abutting portion 72 are respectively located on the upper and lower sides of the second rotating shaft 10. The arrangement of the second rotating shaft 10 improves the flexibility of the rotation of the limiting rod 7.

[0023] As another embodiment of the present invention, please also refer to Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, a rotating portion 73 is further arranged on the limiting rod 7, and a rotating groove (not shown in the figure) cooperating with the rotating portion 73 is arranged in the buckle body 1. The rotating portion 73 rotates along the inner wall of the rotating groove, and the locking tongue portion 71 and the abutting portion 72 are respectively located on the upper and lower sides of the rotating portion 73. The arrangement of the rotating portion 73 and the rotating groove improves the strength of the limiting rod 7.

[0024] Please also refer to Figures 1 to 4 As shown, an inclined section 74 is arranged at the front end of the locking tongue portion 71. The length of the upper part of the inclined section 74 protruding from the inner side wall of the hook-shaped arm is less than the length of the bottom part of the inclined section 74 protruding from the inner side wall of the hook-shaped arm. An acute angle is formed between the inclined section 74 and the bottom of the inclined section 74.

[0025] A first arc section 75 is arranged at the connection of the inclined section 74 and its upper part, and a second arc section 76 is arranged at the connection of the inclined section 74 and its bottom.

[0026] The arrangement of the inclined section 74, the first arc section 75 and the second arc section 76 is respectively beneficial to the reset of the lock arm 2. During the reset process of the lock arm 2, the straight section 91 of the self-locking torsion spring 9 slides along the inner side wall of the hook-shaped arm 4 from top to bottom. The inclined section 74, the first arc section 75 and the second arc section 76 can all reduce the obstruction of the locking tongue portion 71 to the self-locking torsion spring 9, and facilitate the straight section 91 of the self-locking torsion spring 9 to reset to the bottom of the locking tongue portion 71.

[0027] A third rotating shaft 11 is further provided on the buckle body 1, and the end of the locking arm 2 is rotatably connected to the buckle body 1 through the third rotating shaft 11. The setting of the third rotating shaft 11 improves the flexibility of the rotation of the locking arm 2.

[0028] A T-shaped groove 21 and a limiting portion 22 are respectively provided at the end of the locking arm 2, and a T-shaped portion 41 is provided at the front end of the hook-shaped arm 4. The T-shaped portion 41 is located in the T-shaped groove 21 and is blocked by the limiting portion 22. The setting of the T-shaped groove 21 and the T-shaped portion 41 improves the stability and accuracy of the buckling of the locking arm 2 and the hook-shaped arm 4.

[0029] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-locking safety buckle, comprising a buckle body, a locking arm and a buckle ring. The buckle ring is arranged at the lower end of the buckle body. A hook-shaped arm is arranged at the upper end of the buckle body. A rope-passing opening is arranged between the front end of the hook-shaped arm and the buckle body. The end of the locking arm is rotatably connected to the buckle body, and the front end of the locking arm is clamped at the front end of the hook-shaped arm, characterized in that An unlocking member is provided on the outer side of the hook-shaped arm. The unlocking member is rotatably connected to the hook-shaped arm through a first rotating shaft. A limiting rod and a reset spring are respectively provided in the buckle body. The limiting rod is rotatably arranged in the buckle body. A locking tongue portion and an abutting portion are respectively provided at the upper and lower ends of the limiting rod. The front end of the locking tongue portion protrudes outside the inner side wall of the hook-shaped arm. The abutting portion abuts against the unlocking member. A self-locking torsion spring is provided on the locking arm. The end of the self-locking torsion spring is arranged on the locking arm. The front end of the self-locking torsion spring abuts against the bottom of the front end of the locking tongue portion to prevent the locking arm from rotating.

2. The self-locking safety buckle according to claim 1, characterized in that, A straight section is provided at the front end of the self-locking torsion spring. The straight section abuts against the bottom of the front end of the locking tongue portion to prevent the locking arm from rotating.

3. The self-locking safety buckle according to claim 1, characterized in that, A second rotating shaft is further provided on the buckle body. The limiting rod is rotatably connected to the buckle body through the second rotating shaft. The locking tongue portion and the abutting portion are respectively located on the upper and lower sides of the second rotating shaft.

4. The self-locking safety buckle according to claim 1, wherein A rotating portion is further provided on the limiting rod. A rotating groove is provided in the buckle body. The rotating portion rotates along the inner wall of the rotating groove. The locking tongue portion and the abutting portion are respectively located on the upper and lower sides of the rotating portion.

5. The self-locking safety buckle according to claim 1, characterized in that, An inclined section is provided at the front end of the locking tongue portion. The length of the upper part of the inclined section protruding from the inner side wall of the hook-shaped arm is less than the length of the bottom part of the inclined section protruding from the inner side wall of the hook-shaped arm.

6. The self-locking safety buckle according to claim 5, characterized in that, A first arc section is provided at the connection between the inclined section and its upper part. A second arc section is provided at the connection between the inclined section and its bottom part.

7. The self-locking safety buckle according to claim 1, characterized in that, A third rotating shaft is further provided on the buckle body. The end of the locking arm is rotatably connected to the buckle body through the third rotating shaft.

8. The self-locking safety buckle according to claim 1, characterized in that, A T-shaped groove and a limiting portion are respectively provided at the end of the locking arm. A T-shaped portion is provided at the front end of the hook-shaped arm. The T-shaped portion is located in the T-shaped groove and is blocked by the limiting portion.

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