Expansion bolt sleeve easy to disassemble

Abstract

The utility model discloses an expansion bolt sleeve easy to detach, which comprises a sleeve main body with a columnar cavity inside, a tail section cutting groove is axially arranged at the rear section of the sleeve, a front end cutting groove is arranged at the front end of the sleeve along the cambered surface of the sleeve, and the front end cutting groove is partially connected with the sleeve main body at an arc structure separated from the front end of the sleeve. The arc structure is provided with a front end cutting groove in the axial direction to break the arc structure so that the arc structure can be punched and leveled into a straight strip shape, and first through holes are formed in the two ends of the front end cutting groove. When the sleeve is used, the movable arc at the front end is opened and leveled to form the straight strip structure, the straight strip structure is bent outwards around the joint of the sleeve main body to be coplanar with the new top surface of the sleeve, so that the straight strip structure is reserved on the outer surface of a mounting body after the sleeve is assembled into an expansion bolt and is mounted, and the sleeve can be dismounted by pulling the straight strip structure; and the expansion bolt is further removed. The expansion bolt is simple in structure, so that expansion bolts with different functions can be assembled by different types of screws.

Description

Technical Field

[0001] This utility model belongs to the field of expansion bolts, specifically the sleeve of an expansion bolt. Background Technology

[0002] Expansion bolt sleeves are standard accessories for expansion bolts. The sleeves are tightened by being squeezed and deformed against the screw with an expansion head, thereby fixing the bolt in the mounting hole.

[0003] Existing conventional expansion bolt sleeves are non-removable, which in turn prevents the removal of the bolt and the entire expansion bolt itself. Unremovable bolts are not only unsightly and wasteful of resources, but the protruding metal bolt on the mounting surface also poses a safety hazard and causes numerous problems. Current innovations to achieve detachable functionality in expansion bolt sleeves, such as utility model patent CN206429502U, place overly complex structural requirements on the sleeve, making production cumbersome. Another example is invention patent CN103256283A, which requires a special auxiliary device for removal, making operation inconvenient. Summary of the Invention

[0004] To solve the above problems, this utility model provides an easily detachable expansion bolt sleeve. The main body includes a sleeve body with an internal cylindrical cavity. The rear section of the sleeve is provided with multiple axially oriented tail end cutting grooves to divide the rear section of the sleeve into expansion skirts. The tail end cutting grooves are provided with second through holes. At the top of the sleeve, a front end cutting groove is provided along the arc surface of the sleeve to divide the front end of the sleeve into an arc structure. The arc structure is partially connected to the sleeve body. The arc structure at the front end of the sleeve is cut off along the axial direction of the sleeve by a front end cutting groove, so that the arc can be opened and become a movable arc.

[0005] Optionally, the front cutting groove can be one, two, three, or four segments, evenly distributed at the front end of the sleeve, parallel to the upper and lower surfaces of the sleeve, correspondingly dividing the front end of the sleeve into one, two, three, or four arc structures. After one end of these arc structures is cut off by the front cutting groove, they all become movable arcs.

[0006] Furthermore, when the number of front-end cutting grooves is one and the number of front-end arc structures is one, the number of front-end cutting grooves is also one and located in the middle of the arc structure.

[0007] Furthermore, both ends of the front cutting groove are provided with a first through hole, the radius of the first through hole is greater than the wall thickness of the sleeve, and the area of ​​the first through hole is greater than or equal to half of the area located on the side of the front cutting groove closer to the sleeve body.

[0008] By implementing this utility model, after assembling an expansion bolt with the screw, washer, and nut required for conventional expansion bolts, before use, a clamping device, such as pliers, is used to open the movable arc at the front end of the sleeve and straighten it into a straight strip. This straight strip is then bent outwards around the part connecting it to the sleeve so that it is flush with the new top surface of the sleeve. Then, installation is completed by drilling a hole in the mounting base as with ordinary expansion bolt installation. During disassembly, the straight strip with the movable arc on the sleeve is on the outer surface of the mounting base. After removing the nut, fixing object, and washer, the screw is tapped inwards to release the compression lock between the screw expansion head and the sleeve and the mounting hole wall of the base. Using a tool, such as pliers or wire, the straight strip left outside the sleeve is pulled outwards to remove the sleeve, and then the screw is removed, thus disassembling the expansion bolt.

[0009] Optionally, the easily detachable expansion bolt sleeve can be used with straight, L-shaped, hook-shaped, and eye-shaped screws to form expansion bolts with different functions, and realize the detachable function of different types of expansion bolts.

[0010] This invention involves minimal structural modifications to the expansion bolt sleeve, resulting in a simple structure. Since the expansion bolt is secured by the compression and locking between the expansion head of the screw, the expansion skirt at the rear end of the sleeve, and the wall of the mounting base hole, the front end of the sleeve does not bear significant load. Therefore, improvements to the top end will not substantially affect the function of the expansion bolt. Furthermore, the arc at the front end of the sleeve can be left closed during use, allowing the expansion bolt to be permanently fixed like a traditional expansion bolt, preventing removal. The tools used throughout the process are readily available and flexible in application. Attached Figure Description

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0012] Figure 1 This is a schematic diagram of the preferred embodiment of the present invention, in which the top end of the sleeve has a movable arc.

[0013] Figure 2 This is a schematic diagram of the structure of the preferred embodiment of the present invention after the movable arc at the front end of the sleeve is opened and becomes a straight bar;

[0014] Figure 3 This is a schematic diagram of the preferred embodiment of the present invention, in which the top end of the sleeve has two movable arcs.

[0015] Figure 4 This is a schematic diagram of the structure after the movable arc at the front end of the sleeve is opened and becomes a straight bar in the preferred embodiment 2 of this utility model;

[0016] Figure 5 This is a schematic diagram of the preferred embodiment of the present invention, which shows that the top of the sleeve has three movable arcs.

[0017] Figure 6 This is a preferred embodiment 4 of the present invention, which is an exploded structural diagram of the expansion bolt formed by combining the first embodiment with a straight screw, washer, and nut;

[0018] Figure 7 This is a schematic diagram of the structure of Embodiment 4 of the present invention after the movable arc at the front end of the sleeve is opened and assembled with a straight screw, washer, and nut to form an expansion bolt.

[0019] Figure 8 This is a schematic diagram of the installation on the substrate in Embodiment 4 of this utility model;

[0020] Figure 9 This is Embodiment 5 of the present invention, which is a structural diagram of Embodiment 2 after the two movable arc sections at the front end are opened and combined with the L-shaped screw, washer, and nut.

[0021] Figure 10 This is Embodiment 6 of the present invention, which is a structural diagram of Embodiment 2 after the two movable arc sections at the front end are opened and combined with the hook-type screw, washer, and nut.

[0022] Figure 11 This is Embodiment 7 of the present invention, which is a structural diagram of Embodiment 1 after the movable arc at the front end is opened and combined with the lifting eye type screw, washer, and nut;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Sleeve; 11. Tail-end cutting groove; 12. Second through hole; 13. Front cutting groove; 14. Front cutting groove; 15. First through hole; 16. Movable arc connecting to sleeve body; 17. Movable arc; 171. Straight bar; 18. New top surface of sleeve; 2. Nut; 3. Washer; 4. Screw; 41. Thread; 42. Screw expansion head; 43. L-shaped screw; 44. Hook-type screw; 45. Eye-type screw; 5. Base mounting hole; 6. Mounting base. Detailed Implementation

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Example 1,

[0027] like Figure 1As shown, the easily detachable expansion bolt sleeve includes a sleeve body 1 with a cylindrical cavity, three tail-end cutting grooves 11 dividing the rear section of the sleeve into three skirts, each tail-end cutting groove 11 having a second through hole 12 to prevent the tail-end cutting groove 11 from cracking in other directions when the rear end of the sleeve expands, the front end of the sleeve 1 has a front-end cutting groove 13 dividing the front end of the sleeve into an arc structure, the arc structure being partially connected to the sleeve body 16, the arc structure having a front-end cutting groove 14 to disconnect it and make it into a movable arc 17, the movable arc 17 can then be unfolded, the two ends of the front-end cutting groove 13 have first through holes 15, the area of ​​the first through holes being greater than or equal to half the area located on the side of the front-end cutting groove 13 closer to the sleeve body 1.

[0028] like Figure 2 As shown, the movable arc 17 is unfolded and flattened into a straight bar 171, and then bent outward around the connection part 16 between the straight bar 17 and the sleeve body 1. Since the radius of the first through hole 15 is greater than the wall thickness of the sleeve 1, and half or more of the area of ​​the first through hole 15 is located on the side of the front cutting groove 13 near the rear section of the sleeve, the straight bar 171 can be easily adjusted to be coplanar with the new top surface 18 of the sleeve, making the installation of the load more stable.

[0029] Furthermore, the utility model can have multiple front-end cutting grooves 13, resulting in more front-end arc structures. Combined with the front-end cutting groove 14 at one end of each arc, the top of the sleeve 1 can be divided into more movable arcs 17. The straight strip 171 formed after the movable arc 17 is opened can be temporarily trimmed for aesthetic purposes, but should not be shorter than 5 mm to avoid losing disassembly capability. The width of the portion 16 connecting the movable arc 17 to the sleeve body can be adjusted according to the width of the sleeve 1 column, but should not be too wide to affect the bending of the straight strip 171 around the connection 16, nor should it be too narrow to withstand the pulling force of the straight strip 171 during disassembly. The width of the movable arc 7 can also be adjusted according to the size of the expansion bolt, with a minimum width of 2 mm and a maximum width of 10 mm.

[0030] Example 2,

[0031] like Figure 3 The present invention is shown as a preferred embodiment 2, which has two front cutting grooves 13 at the top, which, together with the front cutting groove 14, divide the front end of the sleeve into two movable arcs 17. The front cutting groove 14 is located at one end of each movable arc, unlike the first embodiment where the front cutting groove 14 is located in the middle of the movable arc 17. Each front cutting groove 13 has a first through hole 15 at both ends.

[0032] like Figure 4The diagram shown is a schematic diagram of the two movable arcs 17 at the top of the sleeve 1 after opening in Embodiment 2. The only difference between Embodiment 2 and Embodiment 1 is that there are two straight bars 171 after the two movable arcs 17 at the top of the sleeve 1, which are coplanar with the top surface 18 of the sleeve. This makes the contact between the installed item and the sleeve 1 more stable and aesthetically pleasing than in Embodiment 1. Apart from the above differences, the structure of the tail cutting groove 11, the second through hole 12, etc. in this embodiment is the same as in Embodiment 1. The corresponding effects, operations, requirements and principles are also the same, so they will not be described again.

[0033] Example 3,

[0034] like Figure 5 The image shows a preferred embodiment of this utility model, characterized in that the front end of the sleeve 1 is uniformly provided with three front cutting grooves 13, which, together with the three front cutting grooves 14, divide the front end of the sleeve 1 into three movable arcs 17. In this embodiment, after opening the top movable arc 17, there are three straight bars 171 that are coplanar with the new top surface 18 of the sleeve, which makes the contact between the installed item and the sleeve 1 more stable and aesthetically pleasing compared to embodiments one and two. Apart from the above differences, the structure of the tail cutting groove 11, the second through hole 12, etc., in this embodiment is the same as that in embodiments one and two, and the corresponding effects, operations, requirements, and principles are also the same, which will not be repeated here.

[0035] As described above, the key to the easy disassembly function of the sleeve 1 lies in the movable arc 17 formed by the front cutting groove 13, the front cutting groove 14, and the first through hole 15 at the top of the sleeve 1. The number of movable arcs 17 can be further increased to 4, 5, 6, or more depending on the size of the sleeve 1. However, the number of arcs 17 should not be too many, as it would be inconvenient for production and use, and would also cause the straight bar 171 to be too short, affecting the disassembly capability of the sleeve 1.

[0036] Example 4,

[0037] like Figure 6 The diagram shows a combination of the sleeve 1 in Embodiment 1 and a conventional expansion bolt accessory. Specifically, it is used with a screw 4 (threaded at the front and expansion head 41 at the rear), a nut 2 (threaded at the front of the screw 4), and a washer 3 to form an expansion bolt. The diameter of the screw 4 is slightly smaller than the inner diameter of the sleeve 1 to ensure that the sleeve 1 can slide on the screw 4. The diameter of the expansion head 41 of the screw 4 is equal to the outer diameter of the sleeve 1.

[0038] like Figure 8As shown in the diagram, this is an installation schematic diagram of Embodiment 4 of the present invention. The installation process of this embodiment is the same as the conventional expansion bolt drilling installation process, and will not be described in detail here. During disassembly, remove the nut 2, washer 3, and loading material. Tap the screw 4 inward to release the lock between it and the inner wall of the mounting hole 5 and the sleeve 1. Use a tool, such as pliers, to clamp the straight bar 171 remaining on the mounting surface of the base 6, and then pull the sleeve 1 outward to complete the disassembly of the sleeve 1. Further remove the screw 4 to complete the disassembly of the entire bolt.

[0039] This utility model has a simple structure and can be adapted to various types of screws on the market to form expansion bolts with various functions.

[0040] Example 5,

[0041] like Figure 9 As shown, this embodiment 5 is a schematic diagram of the combination of the two movable arcs 17 at the front end of embodiment 2, along with the L-shaped screw 43, washer 3, and nut 2. The only difference between this embodiment and embodiment 4 is that the matching screw 4 is replaced with an L-shaped screw 43, and the sleeve 1 used is changed from embodiment 1 to embodiment 2, where the top unfolds two movable arcs 17. Apart from the above differences, the nut 2, washer 3, and other structures in this embodiment are the same as in embodiment 4, and the corresponding effects and principles are also the same, so they will not be repeated here.

[0042] Example 6,

[0043] like Figure 10 As shown, this embodiment 6 is a schematic diagram of the combination of the two movable arcs 17 at the front end opened in embodiment 2, along with the hook-type screw 44, washer 3, and nut 2. The only difference between this embodiment and embodiment 4 is that the matching screw 4 is replaced with a hook-type screw 44, and the sleeve 1 used is changed from embodiment 1 to embodiment 2, where the top unfolds two movable arcs 17. Apart from the above differences, the nut 2, washer 3, and other structures in this embodiment are the same as in embodiment 4, and the corresponding effects and principles are also the same, so they will not be repeated here.

[0044] Example 7,

[0045] like Figure 11 As shown, this embodiment 7 is a schematic diagram of the assembly of the movable arc 17 at the front end of embodiment 1, the screw 45 with a lifting eye at the front end, the washer 3, and the nut 2. The only difference between this embodiment and embodiment 4 is that the matching screw 12 is changed from a straight type to a front lifting eye type screw 45. Apart from the above differences, the nut 2, washer 3, and other structures in this embodiment are the same as in embodiment 4, and the corresponding principles are also the same, so they will not be described again.

[0046] As can be seen from the above, this utility model has a wide range of applications, can be flexibly combined, and can be adapted to different screws to meet different usage needs; at the same time, the structure is simple and can be applied to different materials such as stainless steel and steel. The number of movable arcs 17 can also be flexibly adjusted to adapt to different purposes; the structure is simple, the production is simple, and the use is simple. When combined with other conventional components, it forms a detachable expansion bolt, which can be produced and popularized at a very low cost, effectively solving the problems of waste and safety caused by the inability to remove the existing expansion bolt sleeve.

Claims

1. An easily detachable expansion bolt sleeve, characterized in that, The sleeve is cylindrical with an internal cylindrical cavity. The end of the sleeve has a tail section cutting groove along its axial direction to divide the sleeve into multiple skirts. The front end of the sleeve has a front end cutting groove along the arc surface of the cylinder. The front end cutting groove divides the front end of the sleeve into an arc structure. The arc structure is still partially connected to the main body of the sleeve. The arc structure has a front end cutting groove along the axial direction of the cylinder to cut off the arc, turning the front end arc into a movable arc.

2. The easily detachable expansion bolt sleeve as described in claim 1, characterized in that, The front cutting groove is perpendicular to the sleeve axis and parallel to the upper and lower surfaces of the sleeve.

3. The easily detachable expansion bolt sleeve as described in claim 2, characterized in that, The number of cutting grooves at the front end can be one, two, three, or four, which means that the front end of the sleeve is divided into one, two, three, or four arc structures.

4. The easily detachable expansion bolt sleeve as described in claim 3, characterized in that, When the number of arcs is greater than one, they are of equal length and evenly distributed at the front end of the sleeve.

5. The easily detachable expansion bolt sleeve as described in claim 1, characterized in that, When the number of arc structures at the front end of the sleeve is greater than one, the front cutting groove is located at one end of each arc structure in the same circumferential direction.

6. The easily detachable expansion bolt sleeve as described in claim 1, characterized in that, The number of the front cutting groove is also one when the number of arc structures at the front end of the sleeve is one, and it is located in the middle of the arc structure.

7. The easily detachable expansion bolt sleeve as described in claim 3, characterized in that, Each end of the front cutting groove is provided with a first through hole.

8. The easily detachable expansion bolt sleeve as described in claim 7, characterized in that, The radius of the first through hole is greater than the wall thickness of the sleeve, and the area of ​​the first through hole should be greater than or equal to half of the area located on the side of the front cutting groove close to the sleeve body.

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