A detachable and flip - type single - side bolt fastener

Abstract

The present invention belongs to the technical field related to one-sided bolts, and discloses a detachable and flip-type one-sided bolt fastener. The fastener includes a main screw, a sleeve assembly, a washer, a large nut and a small nut. The sleeve assembly is sleeved on one end of the main screw, and the small nut is threadedly connected to the other end of the main screw; the washer and the large nut are both sleeved on the sleeve assembly, and the large nut is threadedly connected to the main screw; the main screw includes a screw rod and a nut connected to one end of the screw rod; the sleeve assembly includes a sleeve body and a plurality of split gaskets. One end of the split gasket is rotatably connected to one end of the sleeve body, and the plurality of split gaskets are evenly arranged around the central axis of the sleeve body; the split gasket rotates towards or away from the screw rod to fit on the screw rod or expand to clamp the connecting piece to be fixed together with the washer. The present invention improves the bolt fastening effect and reusability.

Description

Technical Field

[0001] The present invention belongs to the technical field related to single-sided bolts, and more specifically, relates to a detachable and flip-type single-sided bolt fastener. Background Art

[0002] At present, in the fields of civil engineering and mechanical installation, the demand for connecting and fastening structural members is increasing. For the commonly used bolts, it is necessary to fixedly insert the screw rod on one side of the connecting member and tighten the nut on the other side. Although this connection method is simple and convenient and has excellent load-bearing performance, it is not very suitable for closed-section members and members that are inconvenient to operate on one side. For example, in steel pipe structures, concrete-filled steel tubular structures, and beam-column connection nodes, etc., since the cross-section of the member is a closed cross-section, it is very difficult to operate on both sides simultaneously. In most cases, installation holes need to be reserved before connecting the members, which will weaken the cross-sectional strength and increase the installation cost.

[0003] While single-sided bolts only need to be fixed and tightened on one side of the connecting member, and are more suitable for the above-mentioned occasions. Ordinary expansion single-sided bolts are difficult to apply the bolt pre-tightening force, and the fastening effect cannot meet the design requirements under large loads. And the existing through-core bolts have particularly high requirements for the reserved precision of bolt holes, with great on-site installation difficulty and are difficult to be applied at the edge column and corner column joints. Among the existing single-sided bolts, some bolt structures are too complex and difficult to produce and assemble, some bolts require special installation tools and complex installation steps, and some bolts are difficult to disassemble and cannot be reused. Summary of the Invention

[0004] Aiming at the above defects or improvement requirements of the prior art, the present invention provides a detachable and flip-type single-sided bolt fastener, which improves the bolt fastening effect and reusability, and overcomes the deficiency that the existing bolts cannot be fastened unilaterally.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a detachable and flip-type single-sided bolt fastener, which includes a main screw rod, a sleeve assembly, a washer, a large nut and a small nut. The sleeve assembly is sleeved on one end of the main screw rod, and the small nut is threadedly connected to the other end of the main screw rod; the washer and the large nut are both sleeved on the sleeve assembly, and the large nut is threadedly connected to the main screw rod;

[0006] The main screw includes a screw rod and a nut connected to one end of the screw rod; the sleeve assembly includes a sleeve body and a plurality of split gaskets. One end of each split gasket is rotatably connected to one end of the sleeve body, and the plurality of split gaskets are evenly arranged around the central axis of the sleeve body; the split gaskets are rotated towards or away from the screw rod to fit on the screw rod or unfold, so as to clamp the connecting piece to be fixed together with the washer.

[0007] Further, the outer diameter of the cylinder formed by the plurality of split gaskets fitting on the screw rod is less than or equal to the outer diameter of the nut.

[0008] Further, when the split gaskets fit on the screw rod, the nut and the split gaskets are sequentially passed through at least two connecting pieces to be fastened, and by moving the screw rod, the split gaskets are unfolded to contact the connecting pieces. The large nut is used to limit the position of the washer on the sleeve body, so that the washer and the split gaskets clamp the connecting pieces.

[0009] Further, the small nut is used to limit the position of the sleeve assembly on the screw rod; a clamping portion is formed by cutting one end of the screw rod; a fillet is formed at the edge of the columnar surface of the nut close to the screw rod, and a fillet is provided at the connection between the nut and the screw rod.

[0010] Further, the screw rod is of a semi-threaded type, with half a smooth rod and half a thread. The length of the smooth rod is less than the length of the sleeve body of the sleeve assembly, and the nut is connected to the smooth rod.

[0011] Further, the sleeve body is cylindrical and is formed with a first through hole for the main screw rod to pass through. The diameter of the first through hole corresponds to the outer diameter of the nut; a plurality of sleeve body grooves are formed on one end face of the sleeve body, and the plurality of sleeve body grooves are evenly arranged around the central axis of the sleeve body. The sleeve body grooves are used to accommodate the split gaskets.

[0012] Further, mounting holes are respectively formed on two opposite side walls of the sleeve body groove, and the sleeve body is rotatably connected to the split gasket through the mounting holes.

[0013] Further, rounded corners are formed on the outer edges of the groove walls between adjacent sleeve body grooves. The split gasket includes a rectangular body, a semi - disc and a quarter - disc. The diameter of the semi - disc is the same as the radius of the quarter - disc. The flat end of the semi - disc is connected to one end of the rectangular body, and the other end of the rectangular body is connected to the flat side of the quarter - disc. Thus, a first connection plane is formed between one flat side of the quarter - disc and one side of the rectangular body. The other flat side of the rectangular body is respectively connected to the first arc surface of the semi - disc and the second arc surface of the quarter - disc.

[0014] Further, a split gasket opening is provided at one end of the split gasket adjacent to the semi - disc. The split gasket is rotatably connected to the sleeve body through the split gasket opening.

[0015] Further, the diameter of the split gasket opening is less than or equal to the diameter of the mounting hole.

[0016] Generally speaking, compared with the prior art through the above - conceived technical solution of the present invention, the detachable and flip - type single - side bolt fastener provided by the present invention mainly has the following beneficial effects:

[0017] 1. The present invention only needs to be installed on one side of the connecting piece to achieve single - side fastening.

[0018] 2. The split gaskets of the present invention are already connected to the sleeve before installation. Compared with ordinary gaskets, the installation process of ordinary gaskets is omitted; after installation, each split gasket is in contact with the inner end face of the nut at the same time, and the gasket thickness is large enough, the force is evenly and reliably distributed, and a large bearing capacity can be provided, so that the fastener is not easily pulled out under the action of the load, and the fastening effect is good.

[0019] 3. Before installation, the washer and the large nut of the present invention have been pre - installed on the sleeve assembly, and the small nut has also been installed on the high - strength main screw. During installation, only a flipping space needs to be left for the split gasket, and then the screw is constrained, and the small nut and the large nut are tightened in turn to complete the fastening; during disassembly, only the large nut and the small nut need to be loosened in turn, and then a flipping space is left for the split gasket, and the fastener can be pulled out. Compared with the prior art, the installation is simple, the disassembly is convenient, and it can be reused.

[0020] 4. Compared with the existing single - side fastening bolts made of special materials, no special materials are required, and no support is formed by relying on material deformation, eliminating the hidden danger brought by further deformation of material fatigue.

[0021] 5. The structure of the present invention is simple and compact, with low cost, convenient installation and assembly. Unilateral fastening can be completed without special installation tools, making it easy to use in actual operations. It can not only improve the assembly efficiency but also have reliable force application. The disassembly method is simple and clear, and it can be reused, which is conducive to sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the usage state of the detachable and flip - type unilateral bolt fastener provided by the present invention;

[0023] Figure 2 is Figure 1 a schematic diagram of the main screw of the detachable and flip - type unilateral bolt fastener in

[0024] Figure 3 is Figure 1 a schematic diagram of the sleeve assembly of the detachable and flip - type unilateral bolt fastener in

[0025] Figure 4 is Figure 1 a schematic diagram of the split gasket of the detachable and flip - type unilateral bolt fastener in

[0026] Figure 5 is Figure 3 a schematic diagram of the sleeve body of the sleeve assembly in

[0027] Figure 6a is a schematic diagram of the fastener being inserted into the hole of the connecting piece; Figure 6b is a schematic diagram when the small nut is tightened; Figure 6c is a schematic diagram after the small nut and the large nut are tightened in sequence;

[0028] Figure 7a is a schematic diagram after the large nut and the small nut are loosened in sequence; Figure 7b is a schematic diagram when the fastener is withdrawn; Figure 7c is a schematic diagram after the fastener is withdrawn.

[0029] In all the drawings, the same reference numerals are used to represent the same elements or structures, where: 1 - main screw, 1a - nut, 1b - screw, 1c - clamping part, 2 - sleeve assembly, 2a - split gasket, 2b - sleeve body, 2c - split gasket head, 2d - split gasket root, 2e - split gasket opening, 2f - sleeve body groove, 2g - mounting hole, 3 - washer, 4 - large nut, 5 - small nut, 6 - first connecting piece, 7 - second connecting piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Please refer to Figure 1 , the present invention provides a detachable and flip - type single - side bolt fastener. The fastener includes a main screw 1, a sleeve assembly 2, a washer 3, a large nut 4 and a small nut 5. The sleeve assembly 2 is sleeved on one end of the main screw 1, and the washer 3 is sleeved on the sleeve assembly 2. The large nut 4 is threadedly connected to one end of the sleeve assembly 2 and is disposed adjacent to the sleeve assembly 2. The small nut 5 is threadedly connected to the main screw 1, and the large nut 4 is located between the small nut 5 and the washer 3. Among them, the large nut 4 is used to limit the washer 3, and the small nut 5 is used to limit the sleeve assembly 2.

[0032] Please refer to Figure 2 , the main screw 1 includes a nut 1a and a screw 1b. The nut 1a is provided at one end of the screw 1b, and the other end of the screw 1b is formed with a clamping portion 1c, which is formed by cutting the corresponding end of the screw 1b. An external thread is formed on the outer periphery of the screw 1b adjacent to one end of the clamping portion, and the small nut 5 is threadedly connected to the screw 1b through the external thread. A fillet is formed at the edge of the columnar surface of the nut 1a close to the screw 1b to facilitate the unfolding of the split gasket 2a of the sleeve assembly 2. A fillet is provided at the connection between the nut 1a and the screw 1b to reduce stress concentration.

[0033] In this embodiment, the screw 1b is of a semi - threaded type, with half being a smooth rod and half being threaded. The length of the smooth rod is less than the length of the sleeve body 2b of the sleeve assembly 2; the clamping portion 1c has two parallel cutting surfaces for restricting the main screw to install and disassemble the fastener; of course, in other embodiments, the clamping portion 1c can be provided with multiple cutting surfaces.

[0034] Please refer to Figure 3 , Figure 4 and Figure 5, the sleeve assembly 2 includes a sleeve body 2b and a plurality of split gaskets 2a. One end of each of the plurality of split gaskets 2a is rotatably connected to one end of the sleeve body 2b. The sleeve body 2b is cylindrical and has a first through hole for the main screw 1 to pass through. Wherein, the diameter of the first through hole corresponds to the outer diameter of the nut 1a. A plurality of sleeve body grooves 2f are formed in one end face of the sleeve body 2b, and the plurality of sleeve body grooves 2f are uniformly arranged around the central axis of the sleeve body 2b. The sleeve body grooves 2f are used to accommodate the split gaskets 2a.

[0035] The sleeve body groove 2f communicates with the first through hole, and its depth direction is parallel to the axial direction of the sleeve body 2b. Mounting holes 2g are respectively formed on opposite side walls of the sleeve body groove 2f, and the sleeve body 2b is rotatably connected to the split gasket 2a through the mounting holes 2g.

[0036] Rounding is formed on the outer edge of the groove wall between adjacent sleeve body grooves 2f to facilitate fitting with the main screw 1 and applying a pre-tightening force. In this embodiment, the number of the split gaskets 2a is 8. The thickness of the root of the split gasket 2a is the same as the thickness of the sleeve body 2b, and the width of the root of the split gasket 2a is the same as the width of the sleeve body groove 2f at the end of the sleeve body 2b. Each split gasket 2a can rotate relative to the main screw 1 to fit on the main screw 1 or unfold and fit on the first connecting member 6, and together with the washer 3, fix the first connecting member 6 and the second connecting member 7. The inner diameter and the outer diameter of the cylinder formed when the plurality of split gaskets 2a are tightened are respectively the same as the inner diameter and the outer diameter of the sleeve body 2b, and respectively correspond to the diameter of the screw 1b and the diameter of the first through hole.

[0037] The split gasket 2a is a claw body, which includes a rectangular body, a semi-circular disk and a quarter-circular disk. The semi-circular disk is the split gasket root 2d forming the split gasket 2a, and the quarter-circular disk forms the split gasket head 2c. The diameter of the semi-circular disk is the same as the radius of the quarter-circular disk. The flat end of the semi-circular disk is connected to one end of the rectangular body, and the other end of the rectangular body is connected to the flat side of the quarter-circular disk. Thus, a first connection plane is formed between one flat side of the quarter-circular disk and one side of the rectangular body. The other flat side of the rectangular body is respectively connected to the first arc surface of the semi-circular disk and the second arc surface of the quarter-circular disk. A split gasket opening 2e is formed at one end of the split gasket 2a adjacent to the semi-circular disk. The split gasket 2a is rotatably connected to the sleeve body 2b through the split gasket opening 2e. In this embodiment, the diameter of the split gasket opening 2e is less than or equal to the diameter of the mounting hole 2g, which is convenient for assembling the sleeve assembly 2.

[0038] Among them, the split gasket 2a is connected to the sleeve body 2b through a connecting component. The connecting component includes a spring and two cylinders respectively connected to opposite ends of the spring. One end of each of the two cylinders is respectively arranged in two opposite mounting holes 2g, and the spring and part of the cylinders are received in the split gasket opening 2e. After the split gasket 2a is fully unfolded, the first arc surface of the semi-circular disk fits the fillet at the connection between the nut 1a and the screw rod 1b.

[0039] Before the fastener is installed, the split gasket 2a and the sleeve body 2b are assembled into a sleeve assembly, and then the gasket 3 and the large nut 4 are sleeved on the sleeve body 2b. One end of the main screw rod 1 passes through the sleeve body 2b, and the small nut 5 is threadedly connected to the screw rod 1b, and the clamping part 1c is exposed. The split gasket 2a is in an unfolded state and fits the screw rod 1b.

[0040] The installation process of the fastener is as follows:

[0041] 1. As Figure 6a shown, along the axial direction of the main screw rod 1, the end where the nut 1a of the assembled fastener is located is sequentially passed through the second connecting member 7 and the first connecting member 6 until the large nut 4 presses the washer 3 against the second connecting member 7, leaving a flipping space for the split gasket 2a.

[0042] 2. As Figure 6b shown, restrain the main screw rod 1, rotate the small nut 5, and the split gasket 2a flips towards the first connecting member 6 under the lateral pressure of the nut 1a until it is fully unfolded, and the plane of the nut 1a coincides with one side plane of the split gasket 2a.

[0043] 3. As Figure 6c shown, pull the main screw rod 1 axially back to make the split gasket 2a press against the first connecting member 6, rotate the large nut 4, and apply a pre-tightening force so that the split gasket 2a and the gasket clamp the first connecting member 6 and the second connecting member 7 to complete the installation.

[0044] The disassembly process of the fastener is as follows:

[0045] 1. As Figure 7a shown, restrain the main screw rod 1, and sequentially loosen the large nut 4 and the small nut 5 until the small nut 5 returns to the position beside the clamping part 1c;

[0046] 2. As Figure 7bAs shown in the figure, move the main screw 1 axially until the small nut 5 presses the large nut 4 against the washer 3, leaving a flipping space for the split gasket 2a. Pull the large nut 4 towards the small nut 5. During this process, the split gasket 2a contacts the edge of the hole of the first connector 6, and the split gasket 2a flips towards the screw 1b under the lateral pressure of the first connector 6.

[0047] 3. As Figure 7c As shown in the figure, when the split gasket 2a is completely closed, the maximum diameter of its unfolded range is smaller than the hole diameters of the first connector 6 and the second connector. Clamp the large nut 4 and completely pull out the fastener from the first connector 6 and the second connector 7 to complete the disassembly.

[0048] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A detachable and flip - type single - side bolt fastener, characterized in that: The fastener includes a main screw rod, a sleeve assembly, a washer, a large nut and a small nut. The sleeve assembly is sleeved on one end of the main screw rod, and the small nut is threadedly connected to the other end of the main screw rod; The washer and the large nut are both sleeved on the sleeve assembly, and the large nut is threadedly connected to the sleeve assembly; The main screw rod includes a screw rod and a nut connected to one end of the screw rod; The sleeve assembly includes a sleeve body and a plurality of split gaskets. One end of the split gasket is rotatably connected to one end of the sleeve body, and the plurality of split gaskets are evenly arranged around the central axis of the sleeve body; The split gasket rotates towards or away from the screw rod to fit on the screw rod or unfold to jointly clamp the connecting piece to be fixed with the washer; When the split gasket fits on the screw rod, the nut and the split gasket are sequentially passed through at least two connecting pieces to be fastened, and by moving the screw rod, the split gasket unfolds and contacts the connecting piece. The large nut is used to limit the position of the washer on the sleeve body so that the washer and the split gasket clamp the connecting piece; A fillet is provided at the connection between the nut and the screw rod; A plurality of sleeve body grooves are formed on one end face of the sleeve body; Mounting holes are respectively formed on opposite side walls of the sleeve body groove, and the sleeve body forms a rotational connection with the split gasket through the mounting holes; The split gasket includes a rectangular body, a semi - disc and a quarter - disc. The diameter of the semi - disc is the same as the radius of the quarter - disc. The flat end of the semi - disc is connected to one end of the rectangular body, and the other end of the rectangular body is connected to the flat side of the quarter - disc. Thus, a first connection plane is formed between a flat side of the quarter - disc and one side of the rectangular body. The other flat side of the rectangular body is respectively connected to the first arc surface of the semi - disc and the second arc surface of the quarter - disc; A split gasket opening is formed at one end of the split gasket adjacent to the semi - disc, and the split gasket is rotatably connected to the sleeve body through the split gasket opening; The split gasket is connected to the sleeve body through a connection assembly. The connection assembly includes a spring and two cylinders respectively connected to opposite ends of the spring. One end of each of the two cylinders is respectively arranged in two opposite mounting holes, and the spring and part of the cylinder are received in the split gasket opening.

2. The detachable and flip - type single - side bolt fastener according to claim 1, wherein: The outer diameter of the cylinder formed by a plurality of split gaskets fitting on the screw rod is less than or equal to the outer diameter of the nut.

3. The detachable and flip-type single-sided bolt fastener according to claim 1, wherein: The small nut is used to limit the position of the sleeve assembly on the screw rod; A clamping portion is formed by cutting the other end of the screw rod; A fillet is formed on the cylindrical surface edge of the nut close to the screw rod.

4. The detachable and flip - type single - side bolt fastener according to claim 1, characterized in that: The screw rod adopts a semi - threaded type, with half being a smooth rod and half being a thread. The length of the smooth rod is less than the length of the sleeve body of the sleeve assembly, and the nut is connected to the smooth rod.

5. The detachable and flip-type single-sided bolt fastener according to claim 1, wherein: The sleeve body is cylindrical and is formed with a first through hole for the main screw to pass through, and the diameter of the first through hole corresponds to the outer diameter of the nut; a plurality of the sleeve body grooves are uniformly arranged around the central axis of the sleeve body, and the sleeve body grooves are used for accommodating the split gasket.

6. The detachable and flip - type single - side bolt fastener according to claim 5, characterized in that: Round corners are formed on the outer edges of the groove walls between adjacent sleeve body grooves.

7. The detachable and flip - type single - side bolt fastener according to claim 6, wherein: The diameter of the opening of the split gasket is less than or equal to the diameter of the mounting hole.

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