Method of installing pre-buried stainless steel fasteners

By setting a sliding connection between the threaded rod and the support rod in the pre-embedded stainless steel fastener, and combining it with structures such as nuts, limit strips and rubber rings, the problem of loosening of the locking parts is solved, and the reliability and load-bearing strength of the fastener are improved.

CN116290772BActive Publication Date: 2026-04-17DONGTAI CITY HUAWEI STANDARD COMPONENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGTAI CITY HUAWEI STANDARD COMPONENT CO LTD
Filing Date
2023-04-13
Publication Date
2026-04-17

AI Technical Summary

Technical Problem

Existing pre-embedded stainless steel fasteners are prone to loosening due to upward external forces during construction because the locking parts are not effectively fixed. This results in insufficient reliability.

Method used

By setting the threaded rod and support rod to slide with the hook, adjusting block and support block, and fixing them with nuts, combined with the structure of limit strip, rubber ring and support strip, the load-bearing strength and stability of the hook are enhanced.

Benefits of technology

This design ensures that the hooks are not easily loosened in any direction, improving the reliability and load-bearing capacity of the fasteners and guaranteeing stability during construction.

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Abstract

This invention discloses an installation method for pre-embedded stainless steel fasteners. The key technical points are: First, a pre-embedded rod is welded inside a fixing hole. Then, a connecting plate is welded to an mounting plate. Hooks are then inserted into the first and second welding holes and welded. Threaded rods and support rods are respectively fitted into the first and second sliding holes. First and second nuts are threaded onto the outer wall of the threaded rod. Adjusting blocks and support blocks are respectively inserted into adjusting and supporting grooves, and the threaded rods and support rods are welded into these grooves. The pre-embedded rod is embedded in concrete. After the concrete has completely dried, the lateral position of the hooks is adjusted according to construction needs. Then, the first and second nuts are rotated to fix the hooks, thus completing the preparation and use of the fasteners. This method increases the load-bearing strength of the hooks and prevents them from loosening in any direction, increasing the reliability of the fasteners.
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Description

Technical Field

[0001] This invention relates to the field of fastener technology, and more specifically to a method for installing pre-embedded stainless steel fasteners. Background Technology

[0002] Fasteners are a wide range of mechanical parts used for fastening connections. They are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, mold making, hydraulics, and more. Various types of fasteners can be found on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, meters, and supplies. They are the most widely used basic mechanical components. On construction sites, it is often necessary to pre-embed fasteners in walls for use by personnel during the production process.

[0003] For example, according to Chinese Patent Publication No. CN214657804U, a pre-embedded stainless steel fastener for construction sites includes a fixing frame and a support plate. Before use, the fastener is first embedded in the wall using a fixing rod and a limiting plate to fix its position. During use, the top of the fastener is first inserted into the fixing frame at an angle until the groove structure at the top of the fastener matches the guide rod. The fastener is then pushed downwards until the limiting plate at the bottom of the fastener is inserted between the bottom inner wall of the fixing frame and the locking plate. At the same time, the limiting plate on the rear side of the fastener engages with the locking groove. The cooperation between the limiting plate and the locking groove can effectively prevent the fastener from moving laterally during use. When the hook is subjected to downward pressure, the locking plate and the guide rod can provide support for the entire fastener. Meanwhile, the fixing frame, fixing rod, and support plate, together with the wall, can form a stable triangular structure, ensuring the stability of the device during use.

[0004] However, the above solution still has shortcomings: the device is attached to the fixed frame by a movable locking component, but the locking component is not effectively fixed. This means that the locking component may loosen when subjected to an upward external force during construction, and its reliability cannot be guaranteed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an installation method for pre-embedded stainless steel fasteners. This method solves the problem that while the device uses movable locking parts to attach to the fixed frame, the locking parts are not effectively secured. This results in the locking parts loosening under upward external forces during construction, compromising reliability.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] The installation method for pre-embedded stainless steel fasteners is as follows:

[0008] Step 1: Weld the pre-embedded rod into the inside of the fixing hole, then weld the connecting plate to the mounting plate. At this time, insert the hooks into the first welding hole and the second welding hole respectively and weld them. Then, sleeve the threaded rod and the support rod into the first sliding hole and the second sliding hole respectively.

[0009] Step 2: Connect the first nut and the second nut to the outer wall of the threaded rod respectively. Place the adjusting block and the support block into the adjusting groove and the support groove respectively. Weld the threaded rod and the support rod into the adjusting groove and the support groove.

[0010] Step 3: Embed the pre-embedded rod into the concrete. After the concrete has completely dried, adjust the lateral position of the hook according to the construction needs. Then, rotate the first nut and the second nut to fix the hook, thus completing the preparation and use of the fastener.

[0011] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0012] This invention also provides an installation method for pre-embedded stainless steel fasteners, employing the following technical solution: a mounting plate, wherein fixing holes are provided at four corners on one side of the mounting plate, and pre-embedded rods are fixedly fitted inside the fixing holes; two hooks are provided on one side of the mounting plate; an adjustment assembly, disposed on one side of the mounting plate, for adjusting the position of the hooks according to construction needs; the adjustment assembly includes: a connecting plate, fixedly installed on one side of the mounting plate, an adjustment groove provided on one side of the connecting plate, a threaded rod fixedly installed inside the adjustment groove, two first nuts and two second nuts threadedly connected to the outer circular wall of the threaded rod, two adjustment blocks provided inside the adjustment groove, and one side of the adjustment blocks... The device includes a first welding hole, with the hook fixedly fitted into the first welding hole. The adjusting block has first sliding holes on both its left and right sides. The hook has two connecting holes on its outer circular wall, one of which corresponds to the first sliding hole. The threaded rod is movably fitted into both the connecting hole and the first sliding hole. A support groove is provided on one side of the mounting plate, with a support rod fixedly installed inside. A support block is provided inside the support groove. A second welding hole is provided on one side of the support block, with the hook fixedly fitted into the second welding hole. Second sliding holes are provided on both the left and right sides of the support block, each corresponding to the other connecting hole. The support rod is movably fitted into both the second sliding hole and the connecting hole.

[0013] By adopting the above technical solution, and by setting a threaded rod, the threaded rod and the support rod are slidably connected to the hook, the adjusting block and the support block respectively. This allows the lateral position of the hook to be adjusted according to the fastening requirements during construction. The adjusted hook is then fixed by the first nut and the second nut. The adjusting block and the support block support the hook at both ends of the axial direction, which increases the load-bearing strength of the hook and makes it less prone to loosening from any direction, thus increasing the reliability of the fastener.

[0014] Preferably, the top and bottom surfaces of the adjustment groove are provided with first limiting grooves, and the top and bottom surfaces of the two adjustment blocks are fixedly installed with first limiting strips, which are slidably engaged with the first limiting grooves. The top and bottom surfaces of the support groove are provided with second limiting grooves, and the top and bottom surfaces of the support blocks are fixedly installed with second limiting strips, which are slidably engaged with the second limiting grooves. A reinforcing groove is provided on one side of the mounting plate, and a reinforcing strip is fixedly installed on one side of the connecting plate, which is slidably engaged with the reinforcing groove.

[0015] By adopting the above technical solution, by setting a first limiting strip, and by having the first limiting strip and the second limiting strip slide and engage with the first limiting groove and the second limiting groove respectively, the adjusting block and the supporting block can be limited, making the adjusting block and the supporting block more stable when adjusting and moving.

[0016] Preferably, a first rubber ring is fixedly installed on both sides of the two first nuts that are close to each other, and a second rubber ring is fixedly installed on both sides of the two second nuts that are close to each other.

[0017] By adopting the above technical solution and setting a first rubber ring, the loosening of the first nut can be reduced when the first nut is in contact with the support block.

[0018] Preferably, support bars are fixedly installed on the outer circular walls of both hooks.

[0019] By adopting the above technical solution and setting support bars, the bottom surface of the hook can be supported, thereby further increasing the load-bearing capacity of the hook.

[0020] Preferably, a fixing groove is provided on one side of the connecting plate, and an anti-pressure strip is fixedly sleeved inside the fixing groove. The anti-pressure strip is made of hard alloy.

[0021] By adopting the above technical solution, by setting up an anti-compression strip, and by having the anti-compression strip adhere to the support strip, the deformation of the connecting plate may be caused by the connection plate being directly attached to the support strip if the connection plate is not strong enough.

[0022] Preferably, a connecting ball is fixedly installed at one end of each of the two support bars.

[0023] By adopting the above technical solution, and by setting a connecting ball, the connecting ball replaces the support strip and fits with the anti-pressure strip, thereby reducing the wear of the anti-pressure strip.

[0024] Preferably, one end of each of the pre-embedded rods is fixedly fitted with a connecting plate.

[0025] By adopting the above technical solution, and by setting a connecting plate, the mounting plate can be better fixed by using the connecting plate in conjunction with the pre-embedded rod.

[0026] In summary, the present invention has the following main beneficial effects:

[0027] By setting a threaded rod and slidingly connecting the threaded rod and support rod to the hook, adjusting block and support block respectively, the lateral position of the hook can be adjusted according to the fastening needs during construction. The adjusted hook is fixed by the first nut and the second nut. The adjusting block and support block support the hook at both ends of the axial direction, which increases the load-bearing strength of the hook and makes it less likely to loosen from any direction, thus increasing the reliability of the fastener.

[0028] By setting a first limiting strip, and by having the first limiting strip and the second limiting strip slide and engage with the first limiting groove and the second limiting groove respectively, the adjusting block and the support block can be limited, making the adjusting block and the support block more stable when adjusting and moving.

[0029] By setting a first rubber ring, the loosening of the first nut can be reduced when the first nut is in contact with the support block. By setting a support bar, the bottom surface of the hook can be supported, further increasing the load-bearing strength of the hook.

[0030] By setting up an anti-pressure strip, which is attached to the support strip, the deformation of the connecting plate may be caused by the insufficient strength of the connecting plate being directly attached to the support strip. By setting up a connecting ball, which is attached to the anti-pressure strip instead of the support strip, the wear of the anti-pressure strip is reduced. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the installation method steps for the pre-embedded stainless steel fasteners of the present invention.

[0032] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0033] Figure 3 This is a schematic diagram of the disassembled structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the second limiting groove structure of the present invention;

[0035] Figure 5This is a schematic diagram of the connecting plate structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the support block structure of the present invention.

[0037] Reference numerals: 1. Mounting plate; 2. Fixing hole; 3. Embedded rod; 4. Hook; 5. Connecting plate; 6. Adjusting groove; 7. Threaded rod; 8. First nut; 9. Adjusting block; 10. First welding hole; 11. First sliding hole; 12. Connecting hole; 13. Support groove; 14. Support rod; 15. Support block; 16. Second welding hole; 17. Second sliding hole; 18. First limiting groove; 19. First limiting strip; 20. Second limiting groove; 21. Second limiting strip; 22. First rubber ring; 23. Support strip; 24. Fixing groove; 25. Compression strip; 26. Connecting ball; 27. Connecting disc; 28. Second nut; 29. ​​Second rubber ring; 30. Reinforcing groove; 31. Reinforcing strip. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0039] refer to Figures 1-6 The installation method for pre-embedded stainless steel fasteners is as follows:

[0040] Step 1: Weld the pre-embedded rod 3 into the inside of the fixing hole 2, then weld the connecting plate 5 to the mounting plate 1. At this time, insert the hook 4 into the first welding hole 10 and the second welding hole 16 respectively and weld them. Then, sleeve the threaded rod 7 and the support rod 14 into the inside of the first sliding hole 11 and the second sliding hole 17 respectively.

[0041] Step 2: Connect the first nut 8 and the second nut 28 to the outer wall of the threaded rod 7 respectively; place the adjusting block 9 and the support block 15 into the adjusting groove 6 and the support groove 13 respectively; and weld the threaded rod 7 and the support rod 14 into the adjusting groove 6 and the support groove 13.

[0042] Step 3: Embed the pre-embedded rod 3 into the concrete. After the concrete has completely dried, adjust the lateral position of the hook 4 according to the construction needs. Then, rotate the first nut 8 and the second nut 28 to fix the hook 4, thereby completing the preparation and use of the fastener. Example 2

[0043] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0044] refer to Figure 2 , Figure 4 , Figure 5 and Figure 6 The present invention also provides a method for installing pre-embedded stainless steel fasteners. The following technical solution is adopted, including a mounting plate 1. Fixing holes 2 are provided at each of the four corners on one side of the mounting plate 1. Embedded rods 3 are fixedly fitted inside the fixing holes 2. Two hooks 4 are provided on one side of the mounting plate 1. An adjustment assembly is provided on one side of the mounting plate 1 to adjust the position of the hooks 4 according to construction needs. The adjustment assembly includes a connecting plate 5, which is fixedly installed on one side of the mounting plate 1. An adjustment groove 6 is provided on one side of the connecting plate 5. A threaded rod 7 is fixedly installed inside the adjustment groove 6. The threaded rod 7 is an existing structure and will not be described in detail here. Two first nuts 8 and two second nuts 28 are threadedly connected to the outer circular wall of the threaded rod 7. The first nuts 8 and the two second nuts 28 are existing structures and will not be described in detail here. Two adjusting blocks 9 are provided inside the adjustment groove 6. A first welding hole 10 is provided on one side of the adjusting block 9. The hooks 4 are fixedly fitted into the first welding hole 10. First sliding holes 11 are provided on both the left and right sides of the adjusting block 9. Two connecting holes 12 are provided on the outer circular wall of the hooks 4, one of which corresponds to the first sliding hole 11. The threaded rod 7 is movably fitted into the interior of the connecting hole 12 and the first sliding hole 11, respectively. A support groove 13 is provided on one side of the mounting plate 1, and a support rod 14 is fixedly installed inside the support groove 13. A support block 15 is provided inside the support groove 13, and a second welding hole 16 is provided on one side of the support block 15. The hook 4 is fixedly fitted into the second welding hole 16. A second sliding hole 17 is provided on both the left and right sides of the support block 15. The second sliding hole 17 corresponds to another connecting hole 12. The support rod 14 is movably fitted into the interior of the second sliding hole 17 and the connecting hole 12, respectively. By setting the threaded rod 7, and by slidingly connecting the threaded rod 7 and the support rod 14 to the hook 4, the adjusting block 9 and the support block 15, the lateral position of the hook 4 can be adjusted according to the fastening needs during construction. The adjusted hook 4 is fixed by the first nut 8 and the second nut 28. The adjusting block 9 and the support block 15 support the hook 4 at both ends of the axial direction, which increases the load-bearing strength of the hook 4 and makes the hook 4 less prone to loosening from any direction, thus increasing the reliability of the fastener. Example 3

[0045] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6The top and bottom surfaces of the adjustment groove 6 are provided with first limiting grooves 18. The top and bottom surfaces of the two adjustment blocks 9 are fixedly installed with first limiting strips 19, which are slidably engaged with the first limiting grooves 18. The top and bottom surfaces of the support groove 13 are provided with second limiting grooves 20. The top and bottom surfaces of the support block 15 are fixedly installed with second limiting strips 21, which are slidably engaged with the second limiting grooves 20. A reinforcing groove 30 is provided on one side of the mounting plate 1, and a reinforcing strip 31 is fixedly installed on one side of the connecting plate 5, which is slidably engaged with the reinforcing groove 30. By setting the first limiting strips 19 and the first and second limiting strips 21 being slidably engaged with the first limiting grooves 18 and 20 respectively, the adjustment blocks 9 and the support blocks 15 can be limited, making the adjustment blocks 9 and the support blocks 15 more stable during adjustment and movement. Example 4

[0046] refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 Two first nuts 8 are fixedly installed with first rubber rings 22 on both sides close to each other. The first rubber rings 22 are existing structures and will not be described in detail here. Two second nuts 28 are fixedly installed with second rubber rings 29 on both sides close to each other. The second rubber rings 29 are existing structures and will not be described in detail here. By setting the first rubber rings 22, the first nut 8 can be reduced from loosening when it is in contact with the support block 15. Support bars 23 are fixedly installed on the outer circular wall of the two hooks 4. By setting the support bars 23, the support bars 23 can support the bottom surface of the hook 4 and further increase the load-bearing strength of the hook 4. Example 5

[0047] refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 A fixing groove 24 is provided on one side of the connecting plate 5. An anti-pressure strip 25 is fixedly sleeved inside the fixing groove 24. The anti-pressure strip 25 is made of hard alloy. By setting the anti-pressure strip 25, it fits with the support strip 23, preventing the connecting plate 5 from deforming if it is not strong enough to directly fit the support strip 23. A connecting ball 26 is fixedly installed at one end of each of the two support strips 23. By setting the connecting ball 26, it fits with the anti-pressure strip 25 instead of the support strip 23, thereby reducing the wear of the anti-pressure strip 25. A connecting plate 27 is fixedly installed at one end of several pre-embedded rods 3.

[0048] Working principle: Please refer to Figures 1-6As shown, in use, by setting the pre-embedded rod 3 and welding it inside the fixing hole 2, the connecting plate 5 is then welded to the mounting plate 1. At this time, the hooks 4 are respectively inserted into the first welding hole 10 and the second welding hole 16 and welded. The threaded rod 7 and the support rod 14 are respectively fitted into the first sliding hole 11 and the second sliding hole 17. The first nut 8 and the second nut 28 are respectively threaded to the outer wall of the threaded rod 7. The adjusting block 9 and the support block 15 are respectively placed into the adjusting groove 6 and the support groove 13, and the threaded rod 7 and the support rod 14 are welded into the adjusting groove 6 and the support groove 13. The pre-embedded rod 3 is embedded in the concrete. After the concrete has completely dried, the lateral position of the hook 4 is adjusted according to the construction needs. Then, the first nut 8 and the second nut 28 are rotated to fix the hook 4, thus completing the installation. The fasteners are prepared and used by slidingly engaging the first limiting strip 19 and the second limiting strip 21 with the first limiting groove 18 and the second limiting groove 20 respectively, which can limit the adjustment block 9 and the support block 15, making the adjustment block 9 and the support block 15 more stable during adjustment and movement. The first rubber ring 22 can reduce the loosening of the first nut 8 when it is attached to the support block 15. The support strip 23 can support the bottom surface of the hook 4, further increasing the load-bearing strength of the hook 4. The anti-pressure strip 25 is attached to the support strip 23 to prevent the connection plate 5 from deforming if it is not strong enough to directly attach to the support strip 23. The connecting ball 26 replaces the support strip 23 and is attached to the anti-pressure strip 25, thereby reducing the wear of the anti-pressure strip 25. The connecting plate 27, together with the embedded rod 3, can better fix the mounting plate 1.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method of installing a pre-buried stainless steel fastener, characterised in that, The pre-embedded stainless steel fastener includes: a mounting plate (1), with fixing holes (2) provided at the four corners of one side of the mounting plate (1), and a pre-embedded rod (3) fixedly fitted inside the fixing holes (2), and two hooks (4) provided on one side of the mounting plate (1); An adjustment component, disposed on one side of the mounting plate (1), is used to adjust the position of the hook (4) according to construction needs. The adjustment component includes: A connecting plate (5) is fixedly installed on one side of the mounting plate (1). An adjustment groove (6) is provided on one side of the connecting plate (5). A threaded rod (7) is fixedly installed inside the adjustment groove (6). Two first nuts (8) and two second nuts (28) are threadedly connected to the outer circular wall of the threaded rod (7). Two adjusting blocks (9) are provided inside the adjustment groove (6). A first welding hole (10) is provided on one side of the adjusting block (9). The hook (4) is fixedly sleeved with the first welding hole (10). A first sliding hole (11) is provided on both the left and right sides of the adjusting block (9). Two connecting holes (12) are provided on the outer circular wall of the hook (4). One of the connecting holes (12) corresponds to the first sliding hole (11). The threaded rod (7) is threadedly connected to the first first nut (8) and two second nuts (28). The rod (7) is movably fitted inside the connecting hole (12) and the first sliding hole (11) respectively. A support groove (13) is provided on one side of the mounting plate (1). A support rod (14) is fixedly installed inside the support groove (13). A support block (15) is provided inside the support groove (13). A second welding hole (16) is provided on one side of the support block (15). The hook (4) is fixedly fitted inside the second welding hole (16). A second sliding hole (17) is provided on both the left and right sides of the support block (15). The second sliding hole (17) corresponds to another connecting hole (12). The support rod (14) is movably fitted inside the second sliding hole (17) and the connecting hole (12) respectively. The specific steps of the installation method of the pre-embedded stainless steel fastener are as follows: Step 1: Weld the pre-embedded rod (3) inside the fixed hole (2), then weld the connecting plate (5) to the mounting plate (1). At this time, place the hook (4) into the first welding hole (10) and the second welding hole (16) respectively and weld them. Then, put the threaded rod (7) and the support rod (14) into the first sliding hole (11) and the second sliding hole (17) respectively. Step 2: Connect the first nut (8) and the second nut (28) to the outer wall of the threaded rod (7) respectively. Place the adjusting block (9) and the support block (15) into the adjusting groove (6) and the support groove (13) respectively. Weld the threaded rod (7) and the support rod (14) into the adjusting groove (6) and the support groove (13). Step 3: Embed the pre-embedded rod (3) into the concrete. After the concrete has completely dried, adjust the lateral position of the hook (4) according to the construction needs. Then, rotate the first nut (8) and the second nut (28) to fix the hook (4), thereby completing the preparation and use of the fastener.

2. The method of installing a pre-buried stainless steel fastener according to claim 1, wherein The top and bottom surfaces of the adjustment groove (6) are provided with first limiting grooves (18). The top and bottom surfaces of the two adjustment blocks (9) are fixedly installed with first limiting strips (19). The first limiting strips (19) are slidably engaged with the first limiting grooves (18). The top and bottom surfaces of the support groove (13) are provided with second limiting grooves (20). The top and bottom surfaces of the support block (15) are fixedly installed with second limiting strips (21). The second limiting strips (21) are slidably engaged with the second limiting grooves (20). The mounting plate (1) is provided with a reinforcing groove (30) on one side. The connecting plate (5) is fixedly installed with a reinforcing strip (31). The reinforcing strip (31) is slidably engaged with the reinforcing groove (30).

3. The installation method of the pre-embedded stainless steel fastener according to claim 1, characterized in that, A first rubber ring (22) is fixedly installed on both sides of the two first nuts (8) that are close to each other, and a second rubber ring (29) is fixedly installed on both sides of the two second nuts (28) that are close to each other.

4. The installation method of the pre-embedded stainless steel fastener according to claim 1, characterized in that, Support bars (23) are fixedly installed on the outer circular wall surfaces of both hooks (4).

5. The installation method of the pre-embedded stainless steel fastener according to claim 1, characterized in that, A fixing groove (24) is provided on one side of the connecting plate (5), and an anti-pressure strip (25) is fixedly sleeved inside the fixing groove (24). The anti-pressure strip (25) is made of hard alloy.

6. The installation method of the pre-embedded stainless steel fastener according to claim 4, characterized in that, A connecting ball (26) is fixedly installed at one end of each of the two support bars (23).

7. The installation method of the pre-embedded stainless steel fastener according to claim 1, characterized in that, One end of each of the pre-embedded rods (3) is fixedly fitted with a connecting plate (27).

Citation Information

Patent Citations

  • Multi-direction adjustable embedded part hanging system

    CN112942652A

  • Embedded stainless steel fastener for construction site

    CN214657804U