Cable tie with self-locking structure

Abstract

The present invention discloses a cable tie with a self-locking structure, comprising a metal strip and a fixed head, one end of the metal strip being a fixed end fixed to the fixed head, and the other end being an insertion end, the fixed head being provided with an insertion port and an insertion outlet interpenetrating each other, a locking member being fixed in the fixed head, the locking member comprising a fixing portion and a locking portion, a deformation portion being formed between the fixing portion and the locking portion, and an acute angle being formed between the locking portion and the insertion end of the metal strip pointing to the insertion port. The advantages of the present invention are that when the insertion end of the metal strip is inserted, the deformation portion is deformed, and the locking portion is deflected toward the insertion outlet, so that the insertion end can be inserted smoothly, and when the metal strip is withdrawn in the reverse direction, the surface of the insertion end abuts against the end surface of the locking portion to form self-locking. The cable tie of the present invention has a low manufacturing cost, can form self-locking at any position, and is very convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of cable tie manufacturing, in particular to a cable tie with a self-locking structure. Background Art

[0002] Cable ties are used to tie things together and are widely used in various industries. Depending on the material, common cable ties include plastic cable ties and metal cable ties. Plastics have poor heat resistance, corrosion resistance, and UV resistance, which limits the use of plastic cable ties. Metal cable ties have a wider range of uses than plastic cable ties.

[0003] Cable ties can meet the bundling requirements under normal circumstances, but in some environments where the pull-off requirements are relatively high or the use environment is relatively special (such as a vibration environment), higher requirements are placed on cable ties. In order to ensure the firmness of the cable ties after bundling, the cable ties after bundling and locking are generally subjected to pull-off force tests and vibration tension tests (i.e., pull-off force tests are performed again in a simulated vibration environment). In order to improve the locking force of the cable ties, the method currently used is to set steel balls in the lock buckle. For example, patents 200720195240.7 and 201320720451.3 use this structure, which increases the squeezing force of the steel balls on the cable tie body through the cooperation of the steel balls and the inner inclined surface of the lock buckle, thereby increasing the locking force of the cable tie. This structure can indeed increase the locking force of the cable tie and can pass the pull-off test of the cable tie; however, since the steel balls are not fixed in the lock buckle, during the vibration tension test, the steel balls are prone to slip, resulting in insufficient locking force, and it cannot pass the vibration tension test.

[0004] Another example is patent 201720476803.3, which provides a fixing groove on the belt body and achieves fixation by plugging the extrusion rod into the fixing groove; another example is patent 201720489809.4, which provides a locking door with a metal strip connected to the locking door and provides a circular hole on the belt body and achieves fixation by plugging the metal strip into the circular hole. The locking structures of the above two patents are substantially similar, and fixation is achieved by plugging the insertion rod (insertion strip) into the fixing groove (fixing hole). However, since the fixing groove (fixing hole) is arranged at intervals, locking at any position cannot be achieved, which will cause great trouble during the use of the cable tie and will cause the cable tie to fail to be effectively locked. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a cable tie with a self-locking structure which is simple in structure, easy to use and can form self-locking at any position in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A cable tie with a self-locking structure comprises a metal strap and a fixed head, wherein one end of the metal strap is a fixed end fixed to the fixed head, and the other end is an insertion end, the fixed head is provided with an insertion entrance and an insertion exit interpenetrating with each other, a locking member is fixed in the fixed head, the locking member comprises a fixing portion and a locking portion, a deformation portion is formed between the fixing portion and the locking portion, and an acute angle is formed between the locking portion and the insertion end of the metal strap pointing in the direction of the insertion entrance.

[0008] The optimized technical measures also include:

[0009] The range of the angle is: 70°≤angle α<90°.

[0010] The deformation part is an elastic part with elasticity that enables the locking part to move toward the penetration direction.

[0011] The fixing portion is located at the side of the through-port, and the locking portion is located at the side of the through-port.

[0012] The fixing portion is located at the side of the through-port, and the locking portion is located at the side of the through-port.

[0013] The two ends of the fixing part are respectively connected to a locking part.

[0014] A fixing groove is punched on the fixing head, a socket is opened in the middle of the fixing part of the locking member, a pair of fixing bevels are arranged on both sides of the socket, and the locking member is fixed in the fixing head by the fixing bevels and the fixing groove.

[0015] One end of the fixed head is open, a fixed block is stamped on the fixed head, a card slot is arranged on the fixed block, an insertion port and an oblique card are arranged on the fixed part of the locking member, and the locking member is fixed in the fixed head by the card fit between the oblique card and the card slot.

[0016] A reinforcing rib is vertically formed along the upper edge of the locking portion.

[0017] Both sides of the locking portion are bent to form reinforcement edges.

[0018] The present invention provides a cable tie with a self-locking structure, which has a simple structure. The locking member is fixed in a fixed head, and the locking member includes a fixing portion, a deformation portion and a locking portion, and the angle formed between the locking portion and the insertion end of the metal strip pointing to the insertion port is an acute angle; when the insertion end of the metal strip is inserted, the deformation portion is deformed, and the locking portion is deflected toward the insertion port, so that the insertion end can be inserted smoothly, and when the metal strip is pulled out in the reverse direction, the surface of the insertion end and the end surface of the locking portion are against each other to form a self-locking. The cable tie of the present invention has a low manufacturing cost, can form a self-locking at any position, and is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0020] Figure 2 is a partial cross-sectional structural diagram of the first embodiment of the present invention;

[0021] Figure 3 is a three-dimensional structural diagram of a locking member according to a first embodiment of the present invention;

[0022] Figure 4 yes Figure 2 Force analysis diagram of the middle P part;

[0023] Figure 5 is a structural diagram of Embodiment 2 of the present invention;

[0024] Figure 6 is a partial cross-sectional structural diagram of the second embodiment of the present invention;

[0025] Figure 7 is a three-dimensional structural diagram of a locking member according to a second embodiment of the present invention;

[0026] Figure 8 is a partial cross-sectional structural diagram of the third embodiment of the present invention;

[0027] Fig. 9 It is a partial cross-sectional structural diagram of the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 9 Shown is a schematic diagram of the structure of the present invention,

[0030] The figures are as follows: angle α, metal strip 1, fixed end 11, insertion end 12, fixed head 2, insertion port 2a, insertion outlet 2b, fixed groove 21, fixed block 22, card slot 22a, locking member 3, fixed portion 31, socket 31a, fixed oblique piece 31b, insertion port 31c, oblique card 31d, locking portion 32, reinforcing rib 32a, reinforcing edge 32b, deformation portion 33.

[0031] Embodiment 1, as Figures 1 to 3 As shown,

[0032] A cable tie with a self-locking structure comprises a metal strip 1 and a fixed head 2, wherein one end of the metal strip 1 is a fixed end 11 fixed to the fixed head 2, and the other end is an insertion end 12, wherein the fixed head 2 is provided with an insertion port 2a and an insertion port 2b interpenetrating with each other, a locking member 3 is fixed inside the fixed head 2, and the locking member 3 comprises a fixing portion 31 and a locking portion 32, a deformation portion 33 is formed between the fixing portion 31 and the locking portion 32, and an angle α formed between the locking portion 32 and the insertion end 12 of the metal strip 1 pointing to the insertion port 2a is an acute angle.

[0033] The metal belt 1 can be a stainless steel belt, an iron belt, a copper belt, or a stainless steel braided belt.

[0034] In order to ensure that the insertion end 12 of the metal strap 1 can smoothly pass through the fixed head 2, the locking member 3 needs to be able to deform when the insertion end 12 is inserted. After the cable tie is locked, in order to prevent the insertion end 12 from being pulled out, the locking portion 32 needs to have sufficient rigidity.

[0035] In this embodiment, the two ends of the fixing portion 31 are respectively connected to a locking portion 32; thus, the locking portions 32 are respectively provided at the two ends of the locking member 3, thereby forming a double locking structure, which can further improve the locking force. The assembly structure of the locking member 3 and the fixing head 2 is as follows: a fixing groove 21 is stamped on the fixing head 2, a socket 31a is provided in the middle of the fixing portion 31 of the locking member 3, and a pair of fixing bevels 31b are provided on both sides of the socket 31a, and the locking member 3 is fixed in the fixing head 2 by the fixing bevels 31b and the fixing groove 21.

[0036] When the fixed head 2 is half-formed (bottom open), the locking piece 3 is pushed from bottom to top into the fixed groove 21 of the fixed head 2. Since the fixed bevel 31b is inclined and has a certain elasticity, the fixed bevel 31b can be pushed from bottom to top into the fixed groove 21, and the fixed groove 21 extends into the socket 31a until the fixed bevel 31b reaches above the bottom edge of the fixed groove 21. The fixed bevel 31b is retracted inward to form a snap fit with the fixed groove 21. After the locking piece 3 is assembled, the bottom of the fixed head 2 is bent into shape.

[0037] As an optimization, a reinforcing rib 32a is formed vertically along the locking portion 32 on the locking portion 32. The number of reinforcing ribs 32a can be one, two or more. Providing the reinforcing rib 32a can increase the rigidity of the locking portion 32, and reduce the amount of material used while meeting the rigidity requirements. Of course, the reinforcing edge 32b structure in the second embodiment can also be used to increase the rigidity of the locking portion 32.

[0038] When the insertion end 12 of the metal strip 1 is inserted from the insertion port 2a of the fixed head 2, the deformation portion 33 of the locking portion 32 is formed, and the locking portion 32 is deflected toward the insertion port 2b, so that the insertion end 12 of the metal strip 1 can be smoothly inserted. When the metal strip 1 is pulled out in the opposite direction to the insertion port 2b, since the locking portion 32 is rigid and does not deform, and the upper part of the deformation portion 33 is blocked by the inner wall of the fixed head 2, the locking portion 32 cannot be deflected toward the insertion port 2a, so that the surface of the insertion end 12 of the metal strip 1 is against the end face of the locking portion 32, and the locking portion 32 is stuck between the insertion end 12 of the metal strip 1 and the inner wall of the fixed head 2, so that the cable tie is locked.

[0039] The end surface of the locking portion 32 is in line contact with the surface of the insertion end 12 of the metal strip 1, which increases the contact points and improves the locking force.

[0040] like Figure 4 As shown, the mechanical analysis of the structure is carried out:

[0041] When the locked metal belt 1 is pulled out toward the insertion port 2a, since the locking portion 32 is a rigid part, the force is transmitted along the locking portion 32. Assuming that the force acting on the locking portion 32 is F, its components in the X-axis direction and the Y-axis direction are F1 and F2, respectively, F1=cosαF, F2=sinαF, wherein F2 is balanced with the pressure exerted by the locking portion 32 on the locking portion 32; there is a friction force f between the metal belt 1 and the end surface of the locking portion 32, f=u sinαF, u is the friction coefficient, and the friction coefficient u mainly depends on the roughness of the surface of the metal belt 1; in order to prevent the metal belt 1 from being pulled out, it is necessary to satisfy f>F1, that is, =u sinαF>cosαF, and u>cotα is obtained.

[0042] The function cotα decreases monotonically when α is in the range of 0-90°, that is, the closer α is to 90°, the smaller the value of cotα is, and the smaller the requirement for the friction coefficient u is. Therefore, in theory, the closer the angle α is to 90°, the more conducive it is to locking the metal belt 1.

[0043] The range of the angle α is preferably: 70°≤angle α<90°.

[0044] As an optimization, the deformation portion 33 is an elastic portion having the elasticity to enable the locking portion 32 to move toward the penetration opening 2a.

[0045] When the deformation part 33 is an elastic part, the locking part 32 has the elasticity to move toward the penetration port 2a. In this way, the locking part 32 has a force to deflect toward the penetration port 2a, thereby increasing the pressure of the locking part 32 on the surface of the metal strip 1, that is, the Y-axis direction force F2=sinαF increases. From the condition f>F1, it is derived that u sinαF>cosαF, that is, u>cosαF / sinαF; as sinαF increases, the value of cosαF / sinαF decreases, and the requirement for the friction coefficient u also decreases. Therefore, the deformation part 33 is an elastic part with the elasticity to make the locking part 32 move toward the penetration port 2a, which is conducive to locking the metal strip 1.

[0046] In order to increase the friction coefficient u, the contact surface between the insertion end 12 of the metal strip 1 and the locking portion 32 may be sandblasted to form a sandblasting layer.

[0047] Embodiment 2, as Figures 5 to 7 As shown,

[0048] The cable tie in the second embodiment is similar to the cable tie in the first embodiment in structure and also adopts a double locking structure. Similarly, a locking portion 32 is connected to each end of the fixing portion 31. The assembly structure of the locking member 3 and the fixing head 2 is as follows: one end of the fixing head 2 is open, a fixing block 22 is formed by stamping on the fixing head 2, and a card slot 22a is provided on the fixing block 22. An insertion port 31c and an oblique card 31d are provided on the fixing portion 31 of the locking member 3. The locking member 3 is fixed in the fixing head 2 by the oblique card 31d and the card slot 22a.

[0049] In this embodiment, the installation of the locking member 3 is more convenient. After the locking member 3 is formed, the insertion opening 31c of the locking member 3 is pushed inward from the open end, and the fixing block 22 on the fixing head 2 is inserted into the insertion opening 31c. Since the oblique card 31d is inclined and has a certain elasticity, the fixing block 22 continues to extend until the oblique card 31d is inserted into the card slot 22a to be fixed. This embodiment omits the secondary molding step of the fixing head 2, and the processing is more convenient.

[0050] As an optimization, the two sides of the locking portion 32 are bent to form a reinforcement edge 32b. The reinforcement edge 32b is also provided to increase the rigidity of the locking portion 32. Of course, the reinforcement rib 32a structure in the first embodiment can also be used to increase the rigidity of the locking portion 32.

[0051] Embodiment three, as Figure 8 As shown,

[0052] In this embodiment, a single locking structure is adopted, and the locking member 3 is an integral structure made of a metal strip. The fixing portion 31 is located on the side of the through-port, and the locking portion 32 is located on the side of the through-port. The fixing portion 31 and the fixing head 2 are fixed by welding. When one end of the slender strip-shaped object is fixed, the other unfixed end can naturally deform to form a deformation portion 33. The locking member 3 is made of a metal strip, which is easy to process and has a low manufacturing cost.

[0053] Embodiment 4, as Fig. 9 As shown,

[0054] In this embodiment, a single locking structure is adopted, the fixing portion 31 is located at the side of the through-port, and the locking portion 32 is located at the side of the through-port.

[0055] The best embodiment of the present invention has been described, and various changes or modifications made by those skilled in the art will not depart from the scope of the present invention.

Claims

1. A cable tie with a self-locking structure, comprising a metal strap (1) and a fixing head (2), wherein one end of the metal strap (1) is a fixing end (11) fixed to the fixing head (2), and the other end is an insertion end (12), wherein the fixing head (2) is provided with an insertion opening (2a) and an insertion opening (2b) interpenetrating with each other, wherein a locking member (3) is fixed inside the fixing head (2), wherein the locking member (3) comprises a fixing portion (31) and a locking portion (32), and a deformation portion (33) is formed between the fixing portion (31) and the locking portion (32); wherein the fixing portion (31) and the locking portion (32) are provided with a deformation portion (33); wherein the fixing portion (31) and the locking portion (32) are provided with a deformation portion (33); wherein the fixing portion (31) and the locking portion (32) are provided with a deformation portion (33); wherein the fixing portion (31) and the locking portion (32) are provided with a deformation portion (33); The angle (α) formed between the locking portion (32) and the insertion end (12) of the metal strip (1) pointing toward the insertion port (2a) is an acute angle; the range of the angle (α) is: 70°≤angle (α)<90°; the deformable portion (33) is an elastic portion having elasticity that enables the locking portion to move toward the insertion port; the two ends of the fixing portion (31) are respectively connected to a locking portion (32) to form a double locking structure; when the insertion end (12) of the metal strip (1) is inserted, the deformable portion (33) is deformed, and the locking portion (32) is deflected toward the insertion port (2b), so that the insertion end (12) can be smoothly inserted, and when the metal strip (1) is withdrawn in the reverse direction, the surface of the insertion end (12) and the end surface of the locking portion (32) abut against each other to form a self-locking structure; One end of the fixing head (2) is open, a fixing block (22) is formed by punching on the fixing head (2), a slot (22a) is provided on the fixing block (22), an insertion opening (31c) and an oblique card (31d) are provided on the fixing portion (31) of the locking member (3), and the locking member (3) is fixed in the fixing head (2) by the oblique card (31d) and the slot (22a) being engaged with each other; the insertion opening (31c) of the locking member (3) is pushed inward from the open end, and the fixing block (22) on the fixing head (2) is inserted into the insertion opening (31c), and because the oblique card (31d) is inclined and has a certain elasticity, the fixing block (22) continues to extend until the oblique card (31d) is engaged in the slot (22a) to be fixed.

2. The cable tie with a self-locking structure according to claim 1, characterized in that: A reinforcing rib (32a) is vertically formed along the locking portion (32) on the locking portion (32).

3. The cable tie with a self-locking structure according to claim 1, characterized in that: Both sides of the locking portion (32) are bent to form reinforcing edges (32b).

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