Novel captive screw structure

Abstract

The utility model provides a novel captive screw structure, which relates to the field of fasteners and comprises a bolt. The bolt comprises a head part and a rod body, the head part is cylindrical, and full threads are tapped on the cylindrical surface of the rod body; a nut matched with the bolt is screwed on a rod body of the bolt; a section of sliding supporting hole is formed in a rod body of the bolt in the axial direction, and rotating supporting holes are formed in the upper end and the lower end of the sliding supporting hole in the rod body correspondingly; during installation, a straight head screwdriver is used for screwing the lead screw, so that the jacking piece jacks the nut, the situation that the nut automatically rotates relatively on a bolt and falls off due to vibration generated by connecting a workpiece in the service process is avoided, the anti-loosening effect is achieved, the jacking force of the jacking piece on the nut is fixed and does not change along with the thickness of the workpiece, and the anti-loosening effect is good; the problems that when an existing captive screw is used for connecting two thin plates, positive pressure provided for a nut is gradually reduced along with vibration of a workpiece, and the tendency of loosening still occurs after long-time service are solved.

Description

Technical Field

[0001] This utility model belongs to the field of fasteners, and more specifically, it relates to a novel non-detachable screw structure. Background Technology

[0002] Lockout screws are a common type of fastener used in assembly work. Common lockout screws often employ wedge-shaped locking washers, placed between the bolt head and the workpiece. The washer's engagement angle is greater than the screw's thread helix angle. When the workpiece vibrates and the bolt tends to rotate out of the threaded hole, the washer's lift is greater than the bolt's lift, causing the bolt to tend to tighten back into the threaded hole. However, this method is only suitable for connecting thin plates to thick workpieces, and not for connecting two thin plates using a bolt and nut. Alternatively, a spring structure can be used to supplement the normal pressure on the nut, providing greater friction between the nut and the workpiece, thus preventing relative rotation of the nut relative to the bolt. However, if the workpiece vibrates severely, the normal pressure provided by the spring will be significantly reduced, and the nut may still tend to loosen from the bolt after prolonged use. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a novel non-detachable screw structure to address the issue that the positive pressure provided by the nut to the non-detachable screw when connecting two thin plates gradually decreases with workpiece vibration, and the screw still tends to loosen after long-term service.

[0004] This utility model is based on a pressure ulcer prevention and assistive turning device for bedridden patients, and is achieved through the following specific technical means:

[0005] A novel non-detachable screw structure includes a bolt; the bolt includes a head and a shank, wherein the head is cylindrical and the shank has a fully threaded cylindrical surface; a nut is screwed onto the shank of the bolt and mates therewith; a sliding support hole is axially formed inside the shank of the bolt, and a rotating support hole is formed at the upper and lower ends of the sliding support hole inside the shank; a tightening member is slidably connected to the sliding support hole, the tightening member includes a movable sleeve and tightening protrusions fixedly connected to both sides of the movable sleeve, wherein the tightening protrusions extend outside the sides of the sliding support hole, and a threaded hole is formed inside the movable sleeve, in which a lead screw is inserted; the lead screw is along the bolt axis and includes a threaded rod, the cylindrical surface of which is threaded in the sliding support hole, a limiting protrusion is provided at the upper end of the threaded rod and rotatably connected in the upper rotating support hole, and a nut is provided at the lower end and rotatably connected in the lower rotating support hole.

[0006] Furthermore, the top surface of the bolt head is provided with an internal hexagonal hole, and the cylindrical surface is engraved with anti-slip texture.

[0007] Furthermore, during installation, the clamping protrusion of the clamping member abuts against the nut on the side away from the two connected workpieces.

[0008] Furthermore, a slot with a straight line is provided at the bottom of the screw cap. A limiting component is inserted into the limiting slot. The limiting component is planar and includes a limiting plate and a support plate. The limiting plate is inserted into the limiting slot of the screw, and the support plate has locking teeth on both sides.

[0009] Furthermore, the bolt has an internal toothed ring hole at the bottom along the axial direction, and the retaining teeth on both sides of the limiting member support plate engage with the inner wall of the internal toothed ring hole.

[0010] Furthermore, four insertion holes are provided on the shank of the bolt at the location where the internal toothed ring hole is opened, perpendicularly intersecting each other in the radial direction. Iron wires are inserted into two sets of opposite insertion holes, with the iron wires abutting against the bottom of the limiting member and both ends of the iron wires being bent.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This utility model, by setting a clamping component and a lead screw, allows the screw to be turned with a flathead screwdriver during installation, so that the clamping component holds the nut in place. This prevents the nut from rotating relative to the bolt and falling off due to vibrations generated during the connection of the workpiece during service, thus playing a role in preventing loosening. Moreover, the clamping force of the clamping component on the nut is fixed and does not change with the thickness of the workpiece, resulting in a good anti-loosening effect.

[0013] 2. This utility model, by setting a limiting component and an iron wire, inserts the limiting plate of the limiting component into the limiting slot of the lead screw. The teeth on both sides of the limiting component support plate are engaged with the inner wall of the inner tooth ring hole of the bolt body, and the iron wire is inserted to hold the limiting component in place. This can prevent the lead screw from rotating relative to the bolt if the connected workpiece vibrates violently during service after installation, and the tightening component cannot hold the nut and loosens. This is the second layer of protection against loosening. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is the front view of this utility model.

[0016] Figure 3 This is a utility model Figure 2 A schematic diagram of the internal structure of the central bolt cut along the MM direction.

[0017] Figure 4 This is an installation diagram of this utility model.

[0018] Figure 5 This is a utility model Figure 4 A magnified view of a portion of point A in the middle.

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0020] 1. Bolts;

[0021] 101. Head; 1011. Socket hexagonal hole; 1012. Anti-slip texture; 102. Shaft; 1021. Sliding support hole; 1022. Rotating support hole; 1023. Internal toothed ring hole; 1024. Insertion hole;

[0022] 2. Nuts;

[0023] 3. Tightening components;

[0024] 301. Movable sleeve; 302. Tightening protrusion;

[0025] 4. Lead screw;

[0026] 401. Screw; 402. Limiting protrusion; 403. Screw cap; 4031. Limiting slot;

[0027] 5. Limiting components;

[0028] 501. Limiting plate; 502. Support plate; 5021. Clamping teeth;

[0029] 6. Iron wire. Detailed Implementation

[0030] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0031] Example:

[0032] As attached Figure 1 To be continued Figure 5 As shown:

[0033] This utility model provides a novel non-detachable screw structure, including a bolt 1; the bolt 1 includes a head 101 and a shank 102, wherein the head 101 is cylindrical, and the cylindrical surface of the shank 102 is tapped with a full thread; a nut 2 that mates with the shank 1 is screwed onto the shank 102; a sliding support hole 1021 is axially formed inside the shank 102, and a rotating support hole 1022 is formed at the upper and lower ends of the sliding support hole 1021; a tightening member 3 is slidably connected to the sliding support hole 1021, the tightening member 3 including a movable sleeve 301 and a movable sleeve 30 1. A top-tightening protrusion 302 is fixedly connected on both sides, wherein the top-tightening protrusion 302 extends out of the outside of both sides of the sliding support hole 1021. A threaded hole is opened inside the movable sleeve 301, and a lead screw 4 is inserted into the threaded hole. The lead screw 4 is along the axis of the bolt 1. The lead screw 4 includes a screw 401. The cylindrical surface of the screw 401 is threaded in the sliding support hole 1021. A limiting protrusion 402 is provided at the upper end of the screw 401. The limiting protrusion 402 is rotatably connected in the upper rotating support hole 1022. A nut 403 is provided at the lower end. The nut 403 is rotatably connected in the lower rotating support hole 1022.

[0034] Among them, such as Figure 1 As shown, the top surface of the bolt head 101 is provided with an internal hexagonal hole 1011, and the cylindrical surface is engraved with anti-slip texture 1012. During installation, if the through holes of the two connected workpieces are threaded holes, after aligning the threaded holes of the two workpieces, the cylindrical surface of the bolt head 101 can be held and rotated first to pre-tighten the bolt 1 in the threaded hole of the workpiece, and then the bolt 1 can be completely tightened in the threaded hole of the workpiece by inserting the internal hexagonal hole 1011 through the internal hexagonal hole.

[0035] Among them, such as Figure 4 As shown, during installation, the tightening protrusion 302 of the tightening member 3 abuts against the nut 2 on the side away from the two connected workpieces; during installation, by rotating the lead screw 4, the tightening member 3 presses against the nut 2, preventing the nut 2 from rotating relative to the bolt 1 and falling off due to vibration generated by the connected workpieces during service, thereby playing the role of preventing loosening.

[0036] Among them, such as Figure 4 and Figure 5As shown, the bottom of the screw nut 403 of the lead screw 4 has a slot 4031 with a flat surface. A limiting member 5 is inserted into the slot 4031. The limiting member 5 is planar and includes a limiting plate 501 and a support plate 502. The limiting plate 501 is inserted into the limiting slot 4031 of the lead screw 4, and the support plate 502 has retaining teeth 5021 on both sides. The shaft 102 of the bolt 1 has an internal toothed ring hole 1023 axially formed at its bottom. The retaining teeth 5021 on both sides of the support plate 502 of the limiting member 5 engage with the inner wall of the internal toothed ring hole 1023. The flathead screw... Insert the screwdriver into the limiting slot 4031 of the screw nut 403 and rotate it. Adjust the position of the clamping member 3 on the screw 4 so that it holds the nut 2. Then pull out the screwdriver and insert the limiting plate 501 of the limiting member 5 into the limiting slot 4031 of the screw 4. Make the teeth 5021 on both sides of the limiting member 5 support plate 502 engage with the inner wall of the inner tooth ring hole 1023 of the bolt 1 rod body 102. This can prevent the screw 4 from rotating relative to the bolt 1 due to severe vibration of the connected workpiece during service after installation, and prevent the clamping member 3 from being unable to hold the nut 2 and becoming loose.

[0037] Among them, such as Figure 1 and Figure 5 As shown, four insertion holes 1024 are perpendicularly intersecting each other in the radial direction at the location where the internal toothed ring hole 1023 is opened on the shank 102 of the bolt 1. Among them, iron wire 6 is inserted into the two sets of opposite insertion holes 1024. The iron wire 6 abuts against the bottom of the limiting member 5, and both ends of the iron wire 6 are bent. The iron wire 6 abuts against the limiting member 5 and makes a large intersection angle between the two, which can prevent the limiting plate 501 of the limiting member 5 from coming out of the limiting slot 4031 of the lead screw 4 during service. The limiting member 5 maintains the angular limitation of the lead screw 4 relative to the shank 102 of the bolt 1. The limiting member 5 always presses against the nut 2 to prevent it from loosening.

[0038] The specific usage and function of this embodiment are as follows:

[0039] In this utility model, firstly, the two workpieces are pressed tightly together and the connecting holes are aligned; a bolt 1 is inserted into the connecting hole, and the head 101 of the bolt 1 is pressed against one side of the workpiece; a nut 2 is tightened on the shank 102 of the bolt 1, and the nut 2 is pressed against the other side of the workpiece; a flathead screwdriver is inserted into the limiting slot 4031 of the screw 4's screw cap 403 and rotated; the position of the clamping member 3 on the screw 4 is adjusted so that it presses against the nut 2; then the screwdriver is pulled out, and the limiting plate 501 of the limiting member 5 is inserted into the limiting slot 4031 of the screw 4, and the teeth 5021 on both sides of the limiting member 5's support plate 502 are engaged in the inner wall of the inner toothed ring hole 1023 of the bolt 1's shank 102. This can prevent the screw 4 from rotating relative to the bolt 1 due to severe vibration of the connected workpieces during service after installation, and prevent the clamping member 3 from being unable to hold the nut 2 and becoming loose.

[0040] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

Claims

1. A new loose screw structure, comprising a bolt (1); the bolt (1) comprises a head (101) and a shank (102), wherein the head (101) is cylindrical, and the shank (102) is cylindrical with full thread; a nut (2) is screwed on the shank (102) of the bolt (1) and cooperates with the shank (102); characterized in that: The rod body (102) of the bolt (1) is internally provided with a sliding support hole (1021) along the axial direction, and the rod body (102) is internally provided with a rotating support hole (1022) at the upper end and the lower end of the sliding support hole (1021); the sliding support hole (1021) is slidably connected with a tightening member (3), the tightening member (3) comprises a movable sleeve (301) and a tightening protrusion (302) fixedly connected on both sides of the movable sleeve (301), wherein the tightening protrusion (302) extends outside the both sides of the sliding support hole (1021), the inside of the movable sleeve (301) is provided with a threaded hole, and a lead screw (4) is inserted into the threaded hole in a matched mode; the lead screw (4) is along the axial direction of the bolt (1), and the lead screw (4) comprises a screw rod (401), the cylindrical surface of the screw rod (401) is internally provided with a thread in the sliding support hole (1021), the upper end of the screw rod (401) is provided with a limiting protrusion (402), the limiting protrusion (402) is rotatably connected in the upper rotating support hole (1022), and the lower end is provided with a cap (403), and the cap (403) is rotatably connected in the lower rotating support hole (1022).

2. A new type of loose screw structure according to claim 1, characterized in that: The top surface of the head (101) of the bolt (1) is provided with an internal hexagonal hole (1011), and the cylindrical surface is provided with anti-skid lines (1012).

3. A new type of loose screw structure according to claim 1, characterized in that: When the tightening member (3) is installed, the tightening protrusion (302) of the tightening member (3) abuts against the nut (2) away from the two connecting workpieces.

4. A new type of loose screw structure according to claim 1, characterized in that: The bottom of the cap (403) of the lead screw (4) is provided with a one-word-shaped limiting slot (4031), the limiting slot (4031) is inserted with a limiting member (5), the limiting member (5) is planar, comprising a limiting insertion plate (501) and a supporting plate (502), wherein the limiting insertion plate (501) is inserted into the limiting slot (4031) of the lead screw (4), and the supporting plate (502) is provided with clamping teeth (5021) on both sides.

5. A new type of loose screw structure according to claim 1, characterized in that: The rod body (102) of the bolt (1) is internally provided with an internal tooth ring hole (1023) along the axial direction at the bottom, and the clamping teeth (5021) on both sides of the supporting plate (502) of the limiting member (5) are clamped into the inner wall of the internal tooth ring hole (1023).

6. A new type of loose screw structure according to claim 1, characterized in that: The rod body (102) of the bolt (1) is internally provided with four insertion holes (1024) which are perpendicular to each other in pairs along the radial direction at the position of the internal tooth ring hole (1023), wherein two groups of insertion holes (1024) in opposite directions are inserted with iron wires (6), the iron wires (6) abut against the bottom of the limiting member (5), and the both ends of the iron wires (6) are bent.

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