Large flat head screw

Abstract

The utility model relates to the technical field of screws, and discloses a large flat head screw which comprises a screw body, a nut is fixedly welded to the top end of the screw body, the screw body comprises a screw rod, threads are fixedly arranged on the outer surface of the screw rod, a sleeve is connected to the screw rod in a sleeved mode, a crack is fixedly formed in the lower portion of the screw rod, and the nut comprises a nut body. A transverse crack is fixedly formed in the upper portion of the nut, a longitudinal crack is fixedly formed in the direction perpendicular to the transverse crack, and a limiting piece is fixedly arranged on the side edge of the transverse crack. According to the large-flat-head screw, through the arrangement of the cavity, raw materials are saved, meanwhile, the connecting rod extrudes the disc to enable a crack in the bottom end of the screw rod to be opened, so that the expansion and confining effect is achieved, and through the arrangement of the sleeve, the first fixing block on the sleeve and the second fixing block at the lower end of the cap body can be meshed with each other after the screw is used; loosening and falling of the screw caused by rotation and vibration of the nut are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to a large flat head screw. Background Art

[0002] Screws are a common fastener, often used for assembly between two independent components. When installing and removing screws, a screwdriver is usually inserted into the groove of the screw head and twisted to fasten or separate the screw from the installation part, such as CN218863028U disclosed in the China Patent Network. The connecting ring of the large flat head screw is squeezed, so that the protective frames on both sides are pushed to the opposite side through the inclined rod, so that the block is squeezed, and the fitting block and protective frame can improve the protection of the nut and reduce the loss of the nut. Since the end of the block located on the outside of the installation groove is inclined, it is convenient for the operator to squeeze the screwdriver to the inside of the protective frame and unscrew the screw, thereby achieving the effect of easy disassembly and assembly. However, the utility model has no expansion and no anti-falling effect. Therefore, a large flat head screw is proposed to solve the problems mentioned in the above background. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a large flat head screw, which has the advantages of expansion fastening, anti-falling, etc., and solves the problems mentioned in the above background.

[0005] (II) Technical solution

[0006] To achieve the above object, the utility model provides the following technical solutions: a large flat head screw, comprising a screw body, a nut is fixedly welded to the top of the screw body;

[0007] The screw body comprises a screw rod, a screw thread is fixedly arranged on the outer surface of the screw rod, a sleeve is sleeved on the screw rod, and a crack is fixedly opened at the bottom of the screw rod;

[0008] The nut comprises a cap body, a transverse crack is fixedly provided on the top of the nut, a longitudinal crack is fixedly provided in a direction perpendicular to the transverse crack, and a limiting piece is fixedly provided on the side of the transverse crack.

[0009] Preferably, a cavity is fixedly provided inside the screw rod, a connecting rod is movably provided inside the cavity, a disc is fixedly connected to the bottom of the connecting rod, a return spring is fixedly provided below the disc, and a clamp is fixedly connected to the top of the connecting rod.

[0010] The cavity is set to a structure that is wide at the top and narrow at the bottom. After the disc is pushed by the connecting rod to squeeze the reset spring, the screw rod is squeezed by the disc and the crack begins to be stretched open, and the connection with the screw hole will be tighter, which plays a role of expansion and tightening.

[0011] Preferably, an internal thread meshing with the thread is fixedly provided on the inner wall of the sleeve, and a fixing block 1 is fixedly provided on the top end of the sleeve.

[0012] After the screw rod is installed into the screw hole, the fixing block 1 on the sleeve can mesh with the fixing block 2 to prevent the screw from loosening and falling off due to the rotation and vibration of the nut.

[0013] Preferably, the crack penetrates into the interior of the screw.

[0014] Preferably, a second fixing block is fixedly provided at the lower end of the cap body, and the second fixing block is in the opposite direction to the first fixing block.

[0015] It is beneficial that the fixing block 2 is in the opposite direction to the fixing block 1, and the fixing block 2 is meshed with the fixing block 1.

[0016] Preferably, the connecting rod passes through the cap body to connect the clamp, and the clamp matches the transverse crack.

[0017] After the connecting rod is pushed, the clamping piece above the connecting rod is just clamped into the transverse crack, and then the clamping piece is locked in the transverse crack by toggling the limiting piece.

[0018] Compared with the prior art, the utility model provides a large flat head screw, which has the following beneficial effects:

[0019] 1. The large flat head screw has a cavity. The cavity design not only saves raw materials, but also expands the bottom end of the screw by squeezing the disc through the connecting rod, thereby playing the role of expansion and confinement.

[0020] 2. The large flat head screw is provided with a sleeve, and a fixing block 1 on the sleeve and a fixing block 2 at the lower end of the cap body can mesh with each other after the screw is used, so as to prevent the screw from loosening and falling off due to the rotation and vibration of the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the appearance structure of the nut of the utility model;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the screw of the utility model.

[0024] Among them: 1. screw body; 2. nut; 101. screw; 102. thread; 103. sleeve; 104. crack; 1011. cavity; 1012. connecting rod; 1013. disc; 1014. return spring; 1015. clamp; 1031. fixing block 1; 201. cap body; 202. transverse crack; 203. longitudinal crack; 204. limiter; 2011. fixing block 2. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-3 , a large flat head screw, comprising a screw body 1, a nut 2 is fixedly welded to the top of the screw body 1;

[0027] The screw body 1 includes a screw rod 101, a thread 102 is fixedly arranged on the outer surface of the screw rod 101, a sleeve 103 is sleeved on the screw rod 101, and a crack 104 is fixedly opened at the bottom of the screw rod 101;

[0028] The nut 2 comprises a nut body 201 , a transverse crack 202 is fixedly provided on the top of the nut 2 , a longitudinal crack 203 is fixedly provided in a vertical direction of the transverse crack 202 , and a limiting member 204 is fixedly provided on the side of the transverse crack 202 .

[0029] Through the above technical scheme, when in use, the utility model is aligned with the screw hole on the equipment, and the utility model is rotated into the screw hole on the equipment through the transverse crack 202 and the longitudinal crack 203. After rotating to the bottom, the sleeve 103 will be synchronously rotated to the bottom of the nut 2 until the fixing block 2011 is engaged with the fixing block 1 1031, locking the cap body 201 to prevent the nut 2 from rotating and vibrating and causing the screw to loosen and fall off. The connecting rod 1012 is then pushed by the clamping member 1015 to drive the disc 1013 to squeeze the reset spring 1014, so that the disc 1013 and the screw rod 101 are squeezed. At this time, the screw rod 101 is squeezed by the disc 1013 and the crack 104 begins to be stretched open, and the connection with the screw hole will be tighter, which plays a role of expansion and tightening. Then the clamping member 1015 is locked in the transverse crack 202 by toggling the limit member 204.

[0030] Specifically, a cavity 1011 is fixedly provided inside the screw rod 101, a connecting rod 1012 is movably provided inside the cavity 1011, a disc 1013 is fixedly connected to the bottom of the connecting rod 1012, a return spring 1014 is fixedly provided below the disc 1013, and a clamp 1015 is fixedly connected to the top of the connecting rod 1012.

[0031] The cavity 1011 is configured to be wide at the top and narrow at the bottom. After the connecting rod 1012 pushes the disc 1013 to squeeze the reset spring 1014, the screw rod 101 is squeezed by the disc 1013 and the crack 104 begins to open, making the connection with the screw hole tighter, thereby achieving the effect of expansion and tightening.

[0032] Specifically, an internal thread meshing with the thread 102 is fixedly provided on the inner wall of the sleeve 103 , and a fixing block 1031 is fixedly provided on the top of the sleeve 103 .

[0033] After the screw rod 101 is installed into the screw hole, the fixing block 1031 on the sleeve 103 can mesh with the fixing block 2011 to prevent the screw from loosening and falling off due to the rotation and vibration of the nut 2.

[0034] Specifically, the crack 104 penetrates into the interior of the screw 101 .

[0035] Specifically, a second fixing block 2011 is fixedly provided at the lower end of the cap body 201 , and the second fixing block 2011 is in the opposite direction to the first fixing block 1031 .

[0036] It is beneficial that the fixing block 2011 and the fixing block 1 1031 are in opposite directions, and the fixing block 2011 and the fixing block 1 1031 are engaged with each other.

[0037] Specifically, the connecting rod 1012 passes through the cap body 201 to connect the clamp 1015 , and the clamp 1015 matches the transverse crack 202 .

[0038] After the connecting rod 1012 is pushed, the clamping member 1015 above the connecting rod 1012 is just clamped into the transverse crack 202 , and then the clamping member 1015 is locked in the transverse crack 202 by toggling the limiting member 204 .

[0039] When in use, the utility model is aligned with the screw hole on the equipment, and the utility model is rotated into the screw hole on the equipment through the transverse crack 202 and the longitudinal crack 203. After rotating to the bottom, the sleeve 103 will be synchronously rotated to the bottom of the nut 2 until the fixing block 2011 is engaged with the fixing block 1 1031, locking the cap body 201 to prevent the nut 2 from rotating and vibrating and causing the screw to loosen and fall off. The clamping piece 1015 then pushes the connecting rod 1012 to drive the disc 1013 to squeeze the reset spring 1014, so that the disc 1013 and the screw rod 101 are squeezed. At this time, the screw rod 101 is squeezed by the disc 1013 and the crack 104 begins to be stretched open, and the connection with the screw hole will be tighter, which plays a role of expansion and tightening. The clamping piece 1015 is then locked in the transverse crack 202 by toggling the limit piece 204.

[0040] 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 large flat head screw, comprising a screw body (1), characterized in that: A nut (2) is fixedly welded to the top of the screw body (1); The screw body (1) comprises a screw rod (101), a screw thread (102) is fixedly provided on the outer surface of the screw rod (101), a sleeve (103) is sleeved on the screw rod (101), and a crack (104) is fixedly provided at the bottom of the screw rod (101); The nut (2) comprises a nut body (201), a transverse crack (202) is fixedly provided on the top of the nut (2), a longitudinal crack (203) is fixedly provided in a vertical direction of the transverse crack (202), and a limiting member (204) is fixedly provided on the side of the transverse crack (202).

2. A large flat head screw according to claim 1, characterized in that: A cavity (1011) is fixedly arranged inside the screw rod (101), a connecting rod (1012) is movably arranged inside the cavity (1011), a disc (1013) is fixedly connected to the bottom of the connecting rod (1012), a return spring (1014) is fixedly arranged below the disc (1013), and a clamping piece (1015) is fixedly connected to the top of the connecting rod (1012).

3. A large flat head screw according to claim 1, characterized in that: An internal thread meshing with the thread (102) is fixedly provided on the inner wall of the sleeve (103), and a fixing block 1 (1031) is fixedly provided on the top end of the sleeve (103).

4. A large flat head screw according to claim 1, characterized in that: The crack (104) penetrates into the interior of the screw (101).

5. The large flat head screw according to claim 1, characterized in that: A second fixing block (2011) is fixedly provided at the lower end of the cap body (201), and the second fixing block (2011) is in the opposite direction to the first fixing block (1031).

6. A large flat head screw according to claim 2, characterized in that: The connecting rod (1012) passes through the cap body (201) to connect the clamping piece (1015), and the clamping piece (1015) matches the transverse crack (202).

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