Anti-falling screw and using method thereof

Abstract

The invention discloses an anti-falling screw and a using method thereof.The anti-falling screw comprises a screw rod with threads and a screw head fixedly arranged at one end of the screw rod, a ratchet-wheel-shaped anti-falling piece is fixedly installed on the connecting face of the screw head and the screw rod, and the ratchet wheel direction of the anti-falling piece is opposite to the screwing-in thread direction of the screw rod; by means of the ratchet-shaped anti-falling piece, the anti-reverse-rotation effect of the limiting screw can be achieved, meanwhile, the effect of an elastic gasket can be replaced, and the anti-falling effect of the screw is improved.

Description

Technical Field

[0001] The invention relates to the field of screws, and in particular to an anti-falling screw and a use method thereof. Background Art

[0002] Captive screws, also known as captive screws or captive screws, are screws designed to prevent them from falling out under vibration, impact or other external forces.

[0003] The existing anti-drop screws are prevented from falling off by adding a small-diameter screw rod and hanging the screw on the connecting piece (or through a sleeve or a retaining ring). The structure itself does not directly have the anti-drop function, but achieves the anti-drop effect through a special connection method with the connected piece. Specifically, this screw cleverly uses the small-diameter screw rod to clamp on the mounting hole of the connected piece to achieve the purpose of anti-dropping.

[0004] The invention patent with application number: 200810155236.7 provides a self-locking wood screw, which specifically discloses that two reverse threads and reverse threads are set at the joint between the nail head and the nail body, and the rotation direction of the reverse threads and reverse threads is opposite to the thread direction on the nail body; the self-locking of the screw is achieved by the two reverse threads, but after the reverse threads are set, the structure around the locking hole of the product will be damaged due to the rotation force during the tightening process of the screw, and the reverse threads will not be inserted into the wood, thereby failing to achieve the self-locking effect indicated in the application. Summary of the invention

[0005] The main purpose of the invention is to provide an anti-falling screw and a use method thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] An anti-dropping screw comprises a screw rod with a thread, a screw head fixedly arranged at one end of the screw rod, a ratchet-shaped anti-dropping piece fixedly installed on the connecting surface between the screw head and the screw rod, the ratchet direction of the anti-dropping piece is opposite to the screw-in thread direction of the screw rod, and a starting groove is fixedly provided on the end surface of the screw head away from the screw rod.

[0008] Furthermore, the anti-dropping member comprises a ratchet assembly formed by a plurality of elastic teeth arranged in a circular array around the center of the screw head.

[0009] Furthermore, the elastic tooth portion is arc-shaped, and a blade tip is provided at one end of the elastic tooth portion away from the screw head, and the width of the connection end between the elastic tooth portion and the screw head is much greater than the width of the blade tip.

[0010] Furthermore, the elastic tooth portion is made of a metal material having an elastic effect.

[0011] Furthermore, a plurality of locking holes penetrating the screw head are fixedly provided on the screw head, and a limiting component is slidably connected in the locking hole.

[0012] Furthermore, the limiting assembly includes a limiting fixing plate and limiting nails, one side of the limiting fixing plate is fixedly provided with limiting nails having the same number as the locking holes, and the limiting fixing plate is slidably connected to the screw head.

[0013] Furthermore, the limiting assembly also includes a limiting nut, the outer ring surface of the screw head is provided with an external thread, the inner ring surface of the limiting nut is provided with an internal thread, the limiting nut is rotationally connected to the screw head through a thread, and a limiting fixing plate is clamped inside the limiting nut.

[0014] Furthermore, the number of the locking holes is not less than two, and the locking holes are evenly distributed in a circular shape on the screw head.

[0015] Furthermore, the number of the elastic teeth is not less than two.

[0016] Furthermore, a method for using an anti-dropping screw comprises the steps of:

[0017] S1 screws the end of the screw into the object to be fixed through the thread, and causes the elastic tooth part to form a certain deformation;

[0018] S2 After the screw is locked, the limiting pin of the limiting assembly is inserted into the locking hole, and the limiting pin is inserted through the locking hole into the object to be fixed through the limiting nut to complete the screw installation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention adopts an elastic ratchet type anti-dropping piece structure, so that during the process of tightening the screw, the anti-dropping piece can realize elastic deformation due to pressure, and when the screw falls off due to vibration or other external forces, the screw can be stuck in the locked product due to the tip of the blade provided on the anti-dropping piece, thereby realizing the anti-dropping effect;

[0021] At the same time, the elastic anti-dropping part can also achieve the effect of an elastic gasket, so that the anti-dropping part can absorb the gap and vibration between the screw and the product, and at the same time increase the friction between the screw and the product, thereby further improving the anti-dropping effect.

[0022] The addition of the limiting component further improves the anti-falling effect of the screw. By inserting the limiting component, the possibility of the screw rotating under force can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of the present invention;

[0024] Figure 2A perspective view of the present invention;

[0025] Figure 3 It is a stereogram of Embodiment 2 of the present invention;

[0026] Figure 4 This is a cross-sectional view of the connection between the screw head and the limiting assembly of Example 3 of the present invention.

[0027] Reference numerals

[0028] 1. Screw rod; 2. Screw head; 3. Anti-slip part; 4. Starting groove; 5. Elastic tooth; 6. Locking hole; 7. Limiting assembly; 71. Limiting fixing plate; 72. Limiting nail; 73. Limiting nut. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0030] Example 1

[0031] See also Figure 1-2 As shown, an anti-dropout screw comprises a screw rod 1 with a thread, a screw head 2 fixedly arranged at one end of the screw rod 1, a ratchet-shaped anti-dropout part 3 is fixedly installed on the connecting surface between the screw head 2 and the screw rod 1, the ratchet direction of the anti-dropout part 3 is opposite to the screw-in thread direction of the screw rod 1, and a starting groove 4 is fixedly opened on the end surface of the screw head 2 away from the screw rod 1.

[0032] The start slot 4 includes a slotted, cross, and hexagonal start slot 4, which is used to match with a screwdriver, and the anti-dropping member 3 includes a ratchet assembly formed by a plurality of elastic teeth 5 arranged in a circular array with the center of the screw head 2;

[0033] Among them, the elastic tooth portion 5 is arc-shaped, and a blade tip is provided at one end of the elastic tooth portion 5 away from the screw head 2. The width of the connecting end of the elastic tooth portion 5 and the screw head 2 is much larger than the width of the blade tip, and the elastic tooth portion 5 is made of metal material with elastic effect.

[0034] When in use, the screw rod 1 of the screw is screwed into the product, and the lower part of the elastic tooth portion 5 is oriented in the opposite direction to the screwing direction of the screw rod 1, so that the screw will not get stuck when being tightened, and only elastic deformation will be generated due to pressure, so that the elastic tooth portion 5 can achieve the effect of an elastic gasket, thereby solving the problem that there may be tiny gaps between the connection surfaces due to manufacturing errors, temperature changes or pressure fluctuations in the connection. The elastic tooth portion 5 can fill these gaps to ensure the stability and sealing of the connection;

[0035] In addition, the elastic tooth portion 5 can also absorb vibrations caused by temperature changes, pressure fluctuations or other external factors, thereby achieving an anti-falling effect.

[0036] After the screw is tightened, the screw can be reversed with a reversal angle less than 45°, so that the tip of the blade of the elastic tooth portion 5 is stuck in the product, and the ratchet-shaped elastic tooth portion 5 further prevents the screw from falling off.

[0037] Example 2

[0038] See also Figure 2-3 As shown, the screw part structure of this embodiment is the same as that of embodiment 1, and the difference lies in that: a plurality of locking holes 6 penetrating the screw head 2 are fixedly opened on the screw head 2, and a limiting component 7 is slidably connected in the locking hole 6.

[0039] The limiting assembly 7 includes a limiting fixing plate 71 and limiting nails 72 . One side of the limiting fixing plate 71 is fixedly provided with the limiting nails 72 having the same number as the locking holes 6 . The limiting fixing plate 71 is slidably connected to the screw head 2 .

[0040] After the limiting nail 72 is inserted into the product, the screw can be further prevented from rotating, thereby preventing the screw from falling off.

[0041] Example 3

[0042] See also Figure 4 As shown, the main structure of this embodiment is the same as that of embodiment 2, and the difference is that: the limiting component 7 also includes a limiting nut 73, the outer ring surface of the screw head 2 is provided with an external thread, the inner ring surface of the limiting nut 73 is provided with an internal thread, the limiting nut 73 is rotatably connected to the screw head 2 through a thread, and the limiting fixing plate 71 is clamped inside the limiting nut 73.

[0043] By setting the limiting nut 73 and designing the rotating limiting nut 73, the installation of the limiting component 7 can be facilitated. By rotating the limiting nut 73, the limiting component 7 can be pressed into the product, thereby achieving a quick installation effect.

[0044] It should be noted that the number of the locking holes 6 in the above embodiment is not less than two, and the locking holes 6 are evenly distributed in a circular shape on the screw head 2; the number of the elastic teeth 5 is not less than two.

[0045] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. An anti-drop screw, comprising a screw rod (1) with threads, and a screw head (2) fixedly arranged at one end of the screw rod (1), characterized in that: A ratchet-shaped anti-slipping piece (3) is fixedly mounted on the connection surface between the screw head (2) and the screw rod (1); the ratchet direction of the anti-slipping piece (3) is opposite to the screwing direction of the screw rod (1); and a starting groove (4) is fixedly provided on the end surface of the screw head (2) away from the screw rod (1).

2. The anti-drop screw according to claim 1, characterized in that: The anti-dropping member (3) comprises a ratchet assembly formed by a plurality of elastic teeth (5) arranged in a circular array around the center of the screw head (2).

3. The anti-drop screw according to claim 2, characterized in that: The elastic tooth portion (5) is arc-shaped, and a blade tip is provided at one end of the elastic tooth portion (5) away from the screw head (2). The width of the connection end between the elastic tooth portion (5) and the screw head (2) is much greater than the width of the blade tip.

4. The anti-drop screw according to claim 2, characterized in that: The elastic tooth portion (5) is made of a metal material having an elastic effect.

5. The anti-drop screw according to claim 1, characterized in that: The screw head (2) is fixedly provided with a plurality of locking holes (6) penetrating the screw head (2), and a limiting component (7) is slidably connected in the locking hole (6).

6. The anti-drop screw according to claim 5, characterized in that: The limiting assembly (7) comprises a limiting fixing plate (71) and limiting pins (72), one side of the limiting fixing plate (71) is fixedly provided with the same number of limiting pins (72) as the number of the locking holes (6), and the limiting fixing plate (71) is slidably connected to the screw head (2).

7. The anti-drop screw according to claim 6, characterized in that: The limiting assembly (7) further comprises a limiting nut (73), the outer ring surface of the screw head (2) is provided with an external thread, the inner ring surface of the limiting nut (73) is provided with an internal thread, the limiting nut (73) is rotatably connected to the screw head (2) via a thread, and the limiting fixing plate (71) is clamped inside the limiting nut (73).

8. The anti-drop screw according to claim 6, characterized in that: The number of the locking holes (6) is not less than two, and the locking holes (6) are evenly distributed in an annular shape on the screw head (2).

9. The anti-drop screw according to claim 2, characterized in that: The number of the elastic teeth (5) is no less than two.

10. A method for using the anti-falling screw according to any one of claims 1 to 9, characterized in that: Includes steps: S1 screws the end of the screw rod (1) into the object to be fixed through the thread, and causes the elastic tooth portion (5) to form a certain deformation; S2 After the screw is locked, the limiting pin (72) of the limiting assembly (7) is inserted into the locking hole (6), and the limiting pin (72) is inserted through the locking hole (6) through the limiting nut (73) and into the object to be fixed to complete the screw installation.

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