A type of ceiling expansion bolt

Abstract

This utility model relates to the field of ceiling technology, specifically to a ceiling expansion bolt, comprising, from bottom to top, a lifting connecting screw sleeve, a hexagonal nut, a spring washer, a flat washer, and an expansion bolt assembly. The expansion bolt assembly includes a screw rod, with an expansion tube fitted onto the outer surface of the screw rod. A countersunk head is provided at the top of the screw rod, comprising a lower countersunk head block, a middle countersunk head block, and an upper countersunk head block with progressively increasing diameters. An assembly base is fixedly installed at the bottom center of the middle and upper countersunk head blocks via a connecting column. An assembly slot adapted to the assembly base is opened at the top center of the lower and middle countersunk head blocks. The design of the lower, middle, and upper countersunk head blocks allows the size of the countersunk head to be adjusted, thereby adjusting the expansion space of the expansion bolt. This effectively compensates for the mismatch in hole diameter that occurs during pre-drilling, ensuring that the bolt can be smoothly and securely inserted.

Description

Technical Field

[0001] This utility model relates to the field of ceiling technology, specifically to a ceiling expansion bolt. Background Technology

[0002] The biggest challenge in ceiling mounting is dealing with downward vertical forces such as the weight of chandeliers, fans, and pipes. Ordinary screws rely solely on friction for fixation, while expansion screws achieve strong anchoring through the principle of "mechanical expansion." Technically, ceiling expansion screws typically consist of a screw rod, expansion sleeve, washer, and nut. When the screw rod is tightened, the expansion sleeve is compressed and expands, forming a tight contact with the wall or concrete structure's hole wall, generating significant friction and mechanical interlocking force for a secure fixation. This structural design allows it to adapt to ceiling installation scenarios with varying strength requirements, and it is particularly suitable for lightweight walls or concrete substrates without pre-embedded parts or where welding is not possible.

[0003] However, during installation, corresponding pre-drilling is required, and the diameter and depth must strictly match the expansion bolt specifications. For lightweight walls, which are usually low in strength and loose in structure, the hole diameter is easily too large during pre-drilling. Since the expansion space of the expansion bolt is limited, the expansion tube cannot be firmly inserted. Therefore, it is necessary to design a ceiling expansion bolt to solve the problems mentioned in the background technology. Utility Model Content

[0004] The purpose of this utility model is to provide a ceiling expansion bolt that effectively solves the technical problem that existing ceiling expansion bolts cannot be firmly inserted when the hole diameter is too large during pre-drilling due to limited expansion space.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A ceiling expansion bolt includes, from bottom to top, a lifting connecting screw sleeve, a hexagonal nut, a spring washer, a flat washer, and an expansion screw assembly. The expansion screw assembly includes a screw rod, the outer surface of which is fitted with an expansion tube. A countersunk head is provided at the top of the screw rod. The countersunk head includes a lower countersunk head block, a middle countersunk head block, and an upper countersunk head block with progressively increasing diameters. An assembly base is fixedly installed at the bottom center of the middle countersunk head block and the upper countersunk head block via a connecting column. An assembly slot adapted to the assembly base is opened at the top center of the lower countersunk head block and the middle countersunk head block. A movable cavity is opened inside the lower countersunk head block and the middle countersunk head block near the bottom of the assembly slot. A circular lifting base is movably installed on the bottom surface of the movable cavity via several sets of spring telescopic rods.

[0007] As a preferred embodiment of this utility model, the lower countersunk block is fixedly installed at the top of the screw, the middle countersunk block is movably installed at the top of the lower countersunk block, and the upper countersunk block is movably installed at the top of the middle countersunk block.

[0008] As a preferred embodiment of this utility model, limiting ends are fixedly installed at both ends of the outer surface of the assembly chassis, and embedding ports adapted to the limiting ends are opened at both ends of the inner wall of the assembly slot.

[0009] As a preferred embodiment of this utility model, the expansion tube has an expansion hole groove that is adapted to the screw through its interior, and the outer surface of the expansion tube has several sets of annularly distributed expansion openings near the top, which divide the expansion tube near the top into several sets of annularly distributed expansion tiles.

[0010] As a preferred embodiment of this utility model, the hoisting connecting screw sleeve is screwed on the bottom end of the outer surface of the screw rod, the hexagonal nut is screwed on the outer surface of the screw rod near the top end of the hoisting connecting screw sleeve, and a spring washer and a flat washer are sequentially fitted from bottom to top on the outer surface of the screw rod near the hexagonal nut and the expansion tube.

[0011] As a preferred embodiment of this utility model, the bottom and top ends of the plurality of spring telescopic rods are fixedly connected to the bottom surface of the movable cavity and the bottom surface of the circular lifting base, respectively, and the diameter of the circular lifting base is larger than the diameter of the assembly slot.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In this invention, the design of the lower countersunk block, the middle countersunk block, and the upper countersunk block allows the size of the countersunk head to be adjusted, thereby adjusting the expansion space of the expansion bolt. This effectively compensates for the mismatch in hole diameter that occurs during pre-drilling, ensuring that the bolt can be smoothly and securely inserted. This effectively solves the technical problem that existing ceiling expansion bolts cannot be securely inserted when the hole diameter is too large during pre-drilling due to limited expansion space. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall assembled three-dimensional structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the overall unfolded three-dimensional structure of this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the expansion helical tube assembly in this utility model.

[0017] Figure 4This is a three-dimensional structural diagram of the disassembled countersunk block in this utility model.

[0018] In the diagram: 1. Lifting connecting bolt sleeve; 2. Hexagonal nut; 3. Spring washer; 4. Flat washer; 5. Expansion bolt assembly; 51. Screw; 52. Expansion tube; 521. Expansion slot; 522. Expansion opening; 523. Expansion tile; 53. Countersunk head; 531. Lower countersunk head block; 532. Middle countersunk head block; 533. Upper countersunk head block; 534. Connecting column; 535. Assembly chassis; 5351. Limiting end; 536. Assembly slot; 5361. Embedded socket; 537. Movable cavity; 5371. Spring telescopic rod; 5372. Circular lifting base. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] Example:

[0021] This utility model provides a ceiling expansion bolt, which effectively solves the technical problem that existing ceiling expansion bolts cannot be firmly inserted when the hole diameter is too large during pre-drilling due to limited expansion space.

[0022] Please see Figures 1-4 This utility model provides a technical solution:

[0023] A ceiling expansion bolt includes, from bottom to top, a lifting connection bolt sleeve 1, a hexagonal nut 2, a spring washer 3, a flat washer 4, and an expansion bolt assembly 5.

[0024] The expansion tube assembly 5 includes a screw 51, an expansion tube 52 fitted onto the outer surface of the screw 51, and a countersunk head 53 at the top of the screw 51. The countersunk head 53 includes a lower countersunk head block 531, a middle countersunk head block 532, and an upper countersunk head block 533, with their diameters increasing sequentially. The lower countersunk head block 531 is fixedly installed at the top of the screw 51, the middle countersunk head block 532 is movably installed at the top of the lower countersunk head block 531, and the upper countersunk head block 533 is movably installed at the top of the middle countersunk head block 532. The bottom centers of the middle countersunk head block 532 and the upper countersunk head block 533 are connected by a connecting rod. An assembly base 535 is fixedly installed on the column 534. Limiting ends 5351 are fixedly installed at both ends of the outer surface of the assembly base 535. An assembly slot 536, matching the assembly base 535, is formed at the center of the top surface of the recessed head block 531 and the intermediate recessed head block 532. Insertion slots 5361, matching the limiting ends 5351, are formed at both ends of the inner wall of the assembly slot 536. Movable cavities 537 are formed inside the recessed head block 531 and the intermediate recessed head block 532 near the bottom of the assembly slot 536. The bottom surface of the movable cavity 537 is connected by several... The spring telescopic rod 5371 of the dry assembly is movably mounted with a circular lifting base 5372. The bottom and top ends of several sets of spring telescopic rods 5371 are fixedly connected to the bottom surface of the inner surface of the movable cavity 537 and the bottom surface of the circular lifting base 5372, respectively. The diameter of the circular lifting base 5372 is larger than the diameter of the assembly slot 536. The assembly base 535 is aligned with the assembly slot 536, and the limiting end 5351 is aligned with the insertion slot 5361. Then, the assembly base 535 is inserted into the interior of the movable cavity 537. At this time, under its action, the spring telescopic rod... 5371 retracts, while the circular lifting base 5372 moves downward until the limiting end 5351 passes through the interior of the insertion socket 5361. Then, the assembly chassis 535 is rotated, causing the limiting end 5351 to be misaligned with the insertion socket 5361. Under the reaction force of the spring telescopic rod 5371, the assembly is fixed. Conversely, disassembly can be achieved. This allows the size of the countersunk head to be adjusted, thereby adjusting the expansion space of the expansion bolt. This can effectively compensate for the mismatch of the hole diameter that occurs during pre-drilling, ensuring that it can be smoothly inserted and firmly and reliably.

[0025] Furthermore, in this embodiment, please refer to Figure 3The expansion tube 52 has an expansion slot 521 that is compatible with the screw 51. Several sets of annular expansion openings 522 are opened around the outer surface of the expansion tube 52 near the top. The several sets of annular expansion openings 522 divide the expansion tube 52 near the top into several sets of annular expansion tiles 523. The whole is nailed into the wall with a tool. Then the screw 51 can be moved outward. Under its action, the countersunk head 53 enters the interior of the expansion tube 52. As the countersunk head 53 continues to penetrate, the several sets of annular expansion openings 522 continuously expand, causing the several sets of annular expansion tiles 523 to continuously open until they are firmly stuck into the inner wall of the pre-drilled hole.

[0026] Furthermore, in this embodiment, please refer to Figure 2 and Figure 3 The lifting connection sleeve 1 is screwed on the bottom of the outer surface of the screw rod 51, and the hexagonal nut 2 is screwed on the outer surface of the screw rod 51 near the top of the lifting connection sleeve 1. From bottom to top, spring washers 3 and flat washers 4 are sequentially fitted on the outer surface of the screw rod 51 near the hexagonal nut 2 and the expansion tube 52. The design of the hexagonal nut 2 can be used to fix and lock the components, and the design of the spring washer 3 can further prevent loosening and provide elastic cushioning. At the same time, the design of the flat washer 4 can effectively prevent the nut from loosening and distribute the pressure.

[0027] In this embodiment, the specific implementation scenario is as follows: First, align the assembly chassis 535 with the assembly slot 536, ensuring that the limiting end 5351 corresponds to the insertion slot 5361. Then, insert the assembly chassis 535 into the movable cavity 537. At this time, under its action, the spring telescopic rod 5371 retracts, and the circular lifting base 5372 moves downward until the limiting end 5351 passes through the insertion slot 5361. Subsequently, rotate the assembly chassis 535, causing the limiting end 5351 to misalign with the insertion slot 5361. Under the reaction force of the spring telescopic rod 5371, assembly and fixation are achieved. Conversely, disassembly can be achieved. This allows the size of the countersunk head to be adjusted, thereby adjusting the expansion space of the expansion bolt, effectively compensating for pre-drilled holes. To address the issue of mismatched hole diameters, this method ensures smooth and secure insertion. The entire assembly is then nailed into the wall using tools. The screw 51 is then displaced outwards, causing the countersunk head 53 to enter the expansion tube 52. As the countersunk head 53 continues to penetrate, several annularly distributed expansion openings 522 unfold, causing several annularly distributed expansion tiles 523 to open until they are securely inserted into the pre-drilled hole. Finally, the flat washer 4, spring washer 3, hexagonal nut 2, and lifting connection bolt sleeve 1 are installed sequentially. This method effectively solves the technical problem of existing ceiling expansion bolts failing to securely insert into pre-drilled holes due to limited expansion space, and has significant potential for wider application.

[0028] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ceiling expansion bolt, comprising, from bottom to top, a lifting connection bolt sleeve (1), a hexagonal nut (2), a spring washer (3), a flat washer (4), and an expansion bolt assembly (5), characterized in that: The expansion tube assembly (5) includes a screw (51), an expansion tube (52) is fitted on the outer surface of the screw (51), and a countersunk head (53) is provided at the top of the screw (51). The countersunk head (53) includes a lower countersunk head block (531), a middle countersunk head block (532), and an upper countersunk head block (533) with progressively increasing diameters. The bottom center of the middle countersunk head block (532) and the upper countersunk head block (533) are fixedly installed with an assembly base by a connecting column (534). The tray (535) has an assembly slot (536) at the center of the top surface of the sinker head block (531) and the middle sinker head block (532) that is compatible with the assembly tray (535). The sinker head block (531) and the middle sinker head block (532) have movable cavities (537) near the bottom of the assembly slot (536). The bottom surface of the movable cavity (537) is movably mounted with a circular lifting base (5372) through several sets of spring telescopic rods (5371).

2. The ceiling expansion bolt according to claim 1, characterized in that: The lower countersunk block (531) is fixedly installed at the top of the screw (51), the middle countersunk block (532) is movably installed at the top of the lower countersunk block (531), and the upper countersunk block (533) is movably installed at the top of the middle countersunk block (532).

3. The ceiling expansion bolt according to claim 1, characterized in that: Limiting ends (5351) are fixedly installed at both ends of the outer surface of the assembly chassis (535), and the inner walls of the assembly slot (536) are provided with insertion slots (5361) that are compatible with the limiting ends (5351).

4. A ceiling expansion bolt according to claim 1, characterized in that: The expansion tube (52) has an expansion slot (521) that is compatible with the screw (51) through it. The outer surface of the expansion tube (52) has a number of annular expansion openings (522) near the top. The number of annular expansion openings (522) divides the expansion tube (52) near the top into a number of annular expansion tiles (523).

5. A ceiling expansion bolt according to claim 1, characterized in that: The lifting connection screw sleeve (1) is screwed on the bottom end of the outer surface of the screw rod (51), and the hexagonal nut (2) is screwed on the outer surface of the screw rod (51) near the top end of the lifting connection screw sleeve (1). The outer surface of the screw rod (51) near the hexagonal nut (2) and the expansion tube (52) is fitted with a spring washer (3) and a flat washer (4) from bottom to top.

6. A ceiling expansion bolt according to claim 1, characterized in that: The bottom and top ends of the several sets of spring telescopic rods (5371) are fixedly connected to the bottom surface inside the movable cavity (537) and the bottom surface of the circular lifting base (5372), respectively. The diameter of the circular lifting base (5372) is larger than the diameter of the assembly slot (536).

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