Adjustable expansion bolt

Abstract

The utility model discloses an adjustable expansion bolt which comprises an expansion pipe, an adjusting bolt, a tensioning bolt and a wedge-shaped nut, the expansion pipe is manufactured in a metal stamping and pipe rolling mode, and an inner thread section is arranged on an inner concave rib on the upper portion of the expansion pipe and used for screwing the adjusting bolt to adjust the fixed height. Bayonets are formed in the positions, below the internal thread section, of the inner concave ribs and the edges of the outer convex ribs on the two sides, the head of the tensioning bolt is clamped in the bayonets, the head of the tensioning bolt is screwed to pull the wedge-shaped nut upwards so that the tensioning pipe can be opened, the tensioning plug can be fastened in a base material, and the portions, below the bayonets, of the tensioning pipe are in a fragmented shape.

Description

Technical Field

[0001] This utility model relates to an adjustable expansion bolt. Background Technology

[0002] Expansion bolts (commonly known as expansion plugs) are commonly used fasteners in the construction industry, used to fix surface components to the base wall or roof. To accommodate different base materials and varying required fixing strengths, expansion bolts come in a wide variety of types and specifications. With the increasingly widespread application of prefabricated components, leveling and height adjustment (by...) are crucial during installation. Figure 2 It is evident that the surface of the foundation wall is uneven. According to building standards, a flatness of less than 1.5 cm for a single-sided continuous wall is considered excellent, and less than 2.5 cm is considered acceptable. However, it is quite common for actual wall surfaces to have a flatness greater than 3 cm. Figure 2 The flatness requirements for finished wall finishes are higher than those for building construction. General decoration specifications require a flatness of no more than 0.5 cm, but actual project results range from 0.2 cm to 1 cm. Therefore, to ensure the wall finish meets flatness requirements, the adjustment of the portion of the expansion bolt protruding from the wall is called leveling. Furthermore, the need to adjust the gap between the decorative panel and the base wall to allow space for water and electricity pipes behind the decorative panel (called height adjustment) also increases. Traditional single-bolt expansion bolts, while offering some adjustment capabilities, suffer from drawbacks such as loose fixing, inaccurate adjustment results, or excessively long bolt tails protruding from the wall (or ceiling) after tightening. This poses challenges for the sealed components (…). Figure 2 The components at the back are the base wall, and the components at the front are the decorative panels, which are also fixed by expansion joints. For aesthetic purposes, the outer surface of the decorative panels should not have screw heads, screw holes, or anything other than the decorative finish. This means that leveling and height adjustment must be completed before the panels are sealed; no adjustments can be made afterward. The state where the panels cannot be adjusted after installation is called "closed." However, closed wall finishes require precise adjustments to achieve good flatness, which is inconvenient in scenarios where minimal structural gaps are desired.

[0003] Existing expansion plug usage:

[0004] Figure 1 This is a common situation where expansion plugs are used for point fixing on the basic wall (or when only putty and paint are applied for finishing). Point fixing refers to fixing corner brackets or hangers for equipment such as air conditioners, televisions, and wall cabinets. The left image illustrates this situation, while the right image shows that even if the corner bracket is not perpendicular to the wall, it does not affect the use. The image also shows the installation of a suspended joist. It should be noted that although the joist for installing decorative panels eventually needs to be leveled and adjusted, the situation of fixing a single point is similar to point fixing.

[0005] Fixed-point installation is the most common application scenario for expansion plugs. In this case, there's usually no need for leveling or height adjustment; simply ensuring a secure installation is sufficient. Therefore, conventional expansion plugs don't consider the need for height adjustment. In other words, while there are many types and specifications of expansion plugs, few have a design suitable for adjustment.

[0006] Figure 2 The situation is different. When using prefabricated decorative panels for wall decoration, most of the walls are enclosed, making leveling and height adjustment unavoidable. The traditional approach to this is shown in the diagram.

[0007] Figure 2 As shown on the right, a baseboard (wood grain) is nailed to the wall using expansion plugs, and then the decorative panel is pasted onto the baseboard. Because the baseboard is flatter than the base wall, even if there are slight differences in height due to the unevenness of the base wall during nailing, it can basically meet the decoration requirements as long as the wall only needs to be smooth (without obvious local undulations).

[0008] Figure 2 The image in the middle shows a case where a leveling keel is used for installing decorative panels. First, the keel is nailed to the wall using expansion plugs. Using a laser level as a reference, the keel is adjusted, and then the decorative panels are nailed to the keel. It's important to understand that the keel adjustment is achieved by adjusting the nuts to determine the height of the expansion plugs protruding from the base wall, and then tightening them with self-tapping screws. The disadvantage of this method is that because the length of the expansion plugs entering the wall varies before tightening, and the height of the keel also changes when tightening the self-tapping screws, the adjustment cannot be precise, and the strength of the fixation cannot be guaranteed.

[0009] Figure 2 As shown on the left, this is an existing expansion plug with preliminary adjustment function. Its bolt head is secured to the keel, and the nut is tightened to the approximate position for initial adjustment. Tightening the bolt pulls the wedge nut for pre-tightening. During the final tightening process by further tightening the nut, adjustment and tightening can be performed simultaneously. This method allows for precise adjustment and ensures tightening strength, but the disadvantage is that the adjustment process is cumbersome. Utility Model Content

[0010] The purpose of this invention is to provide an adjustable expansion plug that can conveniently and accurately adjust the gap between the fixed component and the base layer.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] An adjustable expansion bolt is characterized by comprising an expansion tube, an adjusting bolt, a tightening bolt, and a wedge nut. The expansion tube is made by metal stamping and rolling, and its upper concave rib has an internal thread section for adjusting the fixed height by turning the adjusting bolt. A locking slot is provided at the concave rib below the internal thread section and at the edge of the convex ribs on both sides. The head of the tightening bolt is locked in the locking slot. By turning the head of the tightening bolt, the wedge nut is pulled upward to expand the expansion tube and secure the expansion plug in the base material. The expansion tube below the locking slot is segmented.

[0013] The wedge nut includes an upper cylindrical tube and a lower frustum tube. The outer wall of the wedge nut is provided with an outwardly protruding strip corresponding to the segmented seam, and the tube wall of the wedge nut is provided with an internal thread that matches the external thread of the tensioning bolt.

[0014] The gaps between the segments are made at the concave ribs, with 1-2mm concave rib edges on both sides of the gaps. At the bottom of the concave ribs, there is a bevel corresponding to the wall surface of the lower truncated cone of the wedge nut.

[0015] The adjusting bolt is a screw, bolt, or screw riveted to the tray, and / or the top of the outer protruding rib of the expansion tube is flared outward to prevent the expansion tube from rotating when tightened.

[0016] The tensioning bolts are made of internal hexagonal or internal five-pointed sockets to allow the tool to penetrate deep into the expansion tube when tightening.

[0017] An adjustable expansion bolt includes an expansion tube, an adjusting bolt, and a tightening bolt. The expansion tube is made of plastic and has a threaded section on the upper part of its inner wall for the adjusting bolt to be screwed in. The expansion tube below the threaded section is segmented with gaps between the segments. The adjusting bolt has a machine thread, and the tightening bolt has a self-tapping thread. After being tightened, the tightening bolt is located inside the expansion tube.

[0018] The outer wall of the expansion tube is provided with an eccentric wing to prevent the expansion tube from rotating when the tensioning bolt is tightened.

[0019] An adjustable expansion bolt includes an expansion tube, an adjusting bolt, and a wedge-shaped tightening bolt. The expansion tube is made of metal by stamping and rolling. The concave ribs of the expansion tube have internally threaded sections, which serve two purposes: first, they are screwed onto the adjusting bolt, allowing the adjusting bolt to be adjusted to a fixed height; second, they are screwed onto the tightening bolt, allowing the wedge-shaped nut to be pulled upwards by tightening the tightening bolt, thus expanding the expansion tube and securing the expansion plug in the base material. The expansion tube below the locking joint is segmented.

[0020] The wedge-shaped tensioning bolt includes an integrally formed external threaded column and a frustum column; the top of the outer protruding rib of the expansion tube is outwardly flared to prevent the expansion tube from rotating when tightened.

[0021] An adjustable expansion bolt includes an expansion tube, an adjusting bolt, and a tightening bolt. The expansion tube is formed by machining and is a round tube with a continuous internal thread on its inner wall. The lower part of the round tube is segmented, and the top wall of the round tube has an outwardly flared edge. The tightening bolt includes a screw section, and the lower part of the screw section is a tapered head that gradually tapers from top to bottom. The head of the tightening bolt is an internal hexagonal socket.

[0022] The beneficial effects of this utility model are as follows: The adjustable expansion bolt of this utility model uses two bolts inside an expansion tube. One bolt is used to fasten the expansion plug to the base material, while the other bolt is used to adjust the fixed component. This ensures both firm fixation and precise adjustment, while also saving space in the connection structure and maximizing the adjustment range. Attached Figure Description

[0023] Figure 1 This is a diagram showing the usage state of the expansion plug in the existing technology, which is only used in a fixed position.

[0024] Figure 2 This is a diagram showing the usage state of the expansion plug when it is fixed, which has the functions of height adjustment and leveling.

[0025] Figure 3 This is a schematic diagram of the first embodiment of this utility model.

[0026] Figure 3A yes Figure 3 A schematic diagram of the expansion tube from one perspective.

[0027] Figure 3B yes Figure 3 Another structural diagram of the expansion tube

[0028] Figure 3C yes Figure 3 A schematic diagram of the structure from one perspective, excluding the expansion tube.

[0029] Figure 3D yes Figure 3 A structural diagram from another perspective, excluding the expansion tube.

[0030] Figure 4 This is a schematic diagram of the second embodiment of this utility model.

[0031] Figure 4A yes Figure 4 A schematic diagram of the structure after decomposition.

[0032] Figure 4B yes Figure 4 A top view of the structure after the expansion plug is inserted into the hole.

[0033] Figure 5 This is a schematic diagram of the third embodiment of this utility model.

[0034] Figure 5A yes Figure 5 A schematic diagram of the structure from one perspective after removing the expansion tube.

[0035] Figure 5B yes Figure 5 A schematic diagram of the structure from another perspective after removing the expansion tube.

[0036] Figure 5C yes Figure 5 A schematic diagram of the expansion tube from one perspective.

[0037] Figure 5D yes Figure 5 A schematic diagram of the expansion tube from another perspective.

[0038] Figure 6 This is a schematic diagram of the fourth embodiment of this utility model.

[0039] Figure 6A yes Figure 6 A structural diagram from another perspective.

[0040] Figure 6B It is to remove Figure 6 A schematic diagram of the expansion tube structure.

[0041] Figure 6C yes Figure 6 A schematic diagram of the expansion tube structure.

[0042] Figure 7 This is a structural diagram of the utility model in use. Figure 1 (Large gaps).

[0043] Figure 8 This is a structural diagram of the utility model in use. Figure 2 (Small gaps).

[0044] Figure 9 This is a schematic diagram of a structure for adjusting bolts and riveting trays. Detailed Implementation

[0045] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0046] like Figures 3 to 3CAs shown in the preferred embodiment of this utility model, an adjustable expansion bolt includes an expansion tube 1, an adjusting bolt 2, a tightening bolt 3, and a wedge nut 4. The expansion tube is made of metal by stamping and rolling. An internally threaded section is provided on the upper concave rib for screwing onto the adjusting bolt to adjust the fixed height. A locking slot 11 is provided at the concave rib below the internally threaded section and at the edges of the outer protruding ribs on both sides. The head of the tightening bolt 3 is engaged in the locking slot 11. By tightening the head of the tightening bolt, the wedge nut is pulled upwards, thus expanding the expansion tube and securing it to the base material. The expansion tube below the locking slot is segmented, with inwardly pointing vertical ribs cooperating with the wedge nut to ensure the strength of the segment 12. The top of the outer protruding rib of the expansion tube is outwardly flared to prevent the expansion tube from rotating during tightening.

[0047] Specifically, the wedge nut 4 includes an upper cylindrical tube and a lower frustum tube. An external protrusion 41 is provided on the outer wall of the wedge nut, located at the segmented seam 13. The corresponding tube wall of the wedge nut has an internal thread matching the external thread of the tensioning bolt. The gap between the segments is formed at the concave ribs, with 1-2mm edges of the concave ribs on both sides of the gap, called vertical ribs 10. At the bottom of the vertical ribs, a bevel 101 corresponding to the wall surface of the lower frustum of the wedge nut is cut. The open segments at the bottom of the expansion tube are fitted with the wedge nut by the vertical ribs on the open sides for three reasons: first, to increase strength; second, the bevel-to-bevel fit reduces resistance during the pulling and unfolding process. In other words, when the manual torque is the same, a greater external tensioning force can be obtained; third, it is equivalent to increasing the thickness of the segments, allowing for a larger expandable diameter. This is particularly useful for relatively soft wall materials (such as lightweight masonry).

[0048] The adjusting bolt 2 is a screw, bolt, or screw riveted to the tray (e.g., ...). Figure 9 When the adjusting bolt is a screw or bolt, it is equipped with a spare nut 5. A keel is installed between the spare nut and the head of the bolt, and the nut is used to lock the keel. The tensioning bolt 3 is made of internal hexagon or internal five-point socket to facilitate the insertion of tools into the expansion tube when tightening.

[0049] In this preferred embodiment, the expansion bolt deforms the tube by pulling the wedge nut, which makes the tightening process less strenuous.

[0050] like Figures 4 to 4B As shown, another preferred embodiment of this utility model is an adjustable expansion bolt, comprising an expansion tube 1A, an adjusting bolt 2A, and a tightening bolt 3A. The expansion tube is made of plastic, and a threaded section for the adjusting bolt is provided on the upper part of the inner wall of the expansion tube. The expansion tube below the threaded section is segmented, with gaps between the segments. The adjusting bolt has a machine thread, and the tightening bolt has a self-tapping thread. After being tightened, the tightening bolt is located inside the expansion tube. An eccentric wing 11A is provided on the outer wall of the expansion tube to prevent the expansion tube from rotating when the tightening bolt is tightened.

[0051] Depend on Figure 4B As shown, the eccentric wings are vertically aligned, but the upper wing deviates to the left and the lower wing to the right; the wingtip distance is greater than that of the cement hole. Therefore, when the expansion plug is inserted into the hole, both eccentric wings will deform clockwise; when tightening bolts, conventional positive threads are screwed in clockwise, and if the expansion plug is loose against the wall, it will also rotate clockwise; because the eccentric wings deform clockwise, when the expansion plug attempts to rotate clockwise, it is against the direction of the eccentric wings' deformation, which will generate greater resistance.

[0052] like Figures 5 to 5D This is the third embodiment of the present invention, an adjustable expansion bolt, comprising: an expansion tube 1a, an adjusting bolt 2a, and a wedge-shaped tensioning bolt 3a. The expansion tube is made by metal stamping and rolling. The inner concave rib of the expansion tube has an internal thread section, which serves two purposes: first, it is screwed to the adjusting bolt to adjust the fixed height when the adjusting bolt is tightened; second, it is screwed to the wedge-shaped tensioning bolt. By tightening the wedge-shaped tensioning bolt, the wedge head of the wedge-shaped tensioning bolt is pulled upwards, causing the expansion tube to expand and thus securing the expansion plug in the base material. The lower part of the expansion tube is segmented. Similar to the previous embodiment, the gap between the segments is formed at the concave rib, with 1-2mm concave rib edges on both sides of the gap, called vertical ribs. At the bottom of the vertical rib, a bevel corresponding to the wall surface of the lower frustum of the wedge-shaped nut is cut. The open section at the bottom of the expansion joint, with its side ribs engaging with the wedge nut, serves three purposes: first, to increase strength; second, the beveled surface engagement reduces resistance during the pulling and unfolding process—in other words, a greater external tension force can be achieved with the same manual torque; and third, it effectively increases the thickness of the section, allowing for a larger expandable diameter. This is particularly useful for softer wall materials (such as lightweight masonry).

[0053] The wedge-shaped tensioning bolt 3a includes an integrally formed externally threaded post 31a and a wedge-shaped head 32a, the wedge-shaped head being a frustum shape that expands outward from top to bottom. The top of the outer rib of the expansion tube is outwardly flared to prevent the expansion tube from rotating when tightened.

[0054] like Figures 6 to 6C The image shows the fourth embodiment of this utility model: an adjustable expansion bolt, comprising an expansion tube 1b, an adjusting bolt 2b, and a tightening bolt 3b. The expansion tube is a round tube with a continuous internal thread on its inner wall and a segmented lower part. The top wall of the round tube has an outwardly flared edge 11b. The tightening bolt includes a screw section, with a tapered head 31b tapering downwards at the lower part of the screw section. The head of the tightening bolt is an internal hexagonal socket.

[0055] like Figure 7 and Figure 8The diagram shows the usage state of this utility model. During manufacturing, the head of the tensioning bolt is rolled into the groove of the inner concave rib of the expansion tube, limiting its upper and lower positions during tightening. This ensures that the wedge nut is pulled into the expansion tube when the tensioning bolt is tightened. The wedge nut is screwed onto the tensioning bolt before installation, leaving it in a relaxed state before the expansion tube begins to tighten. During installation, the expansion tube, tensioning bolt, and wedge nut assembly are inserted into a pre-drilled hole in the wall (or roof). A tool that can freely penetrate the threaded hole of the expansion tube adjustment section is used to tighten the tensioning bolt until the expansion plug is securely tightened in the hole. Then, the adjustment bolt is screwed into the expansion tube and adjusted to approximately the desired height. Using a laser level as a reference, the adjustment bolt is finely adjusted so that the keel, tray, and other components mounted on the adjustment bolt reach the desired positions, and then locked with the spare nut 5.

[0056] The expansion plugs of this invention are equipped with tensioning bolts and adjusting bolts, which can achieve the purpose of reliable tensioning first and then fine adjustment.

Claims

1. An adjustable expansion bolt, characterized in that: It includes an expansion tube, adjusting bolt, tightening bolt, and wedge nut. The expansion tube is made of metal by stamping and rolling. The upper concave rib has an internal thread section for adjusting the fixed height by turning the adjusting bolt. There are slots at the concave rib below the internal thread section and at the edges of the outer convex ribs on both sides. The head of the tightening bolt is locked in the slot. By turning the head of the tightening bolt, the wedge nut is pulled upward to open the expansion tube and fix the expansion plug in the base material. The expansion tube below the slot is segmented.

2. The adjustable expansion bolt according to claim 1, characterized in that, The wedge nut includes an upper cylindrical tube and a lower frustum tube. The outer wall of the wedge nut is provided with an outwardly protruding strip corresponding to the segmented seam, and the tube wall of the wedge nut is provided with an internal thread that matches the external thread of the tensioning bolt.

3. The adjustable expansion bolt according to claim 2, characterized in that: The gaps between the segments are made at the concave ribs, with 1-3m concave rib edges on both sides of the gaps. At the bottom of the concave ribs, there is a bevel corresponding to the wall surface of the lower truncated cone of the wedge nut.

4. The adjustable expansion bolt according to claim 1, characterized in that, The adjusting bolt is a screw, bolt, or screw riveted to the tray, and / or the top of the outer protruding rib of the expansion tube is flared outward to prevent the expansion tube from rotating when tightened.

5. The adjustable expansion bolt according to claim 1, characterized in that, The tensioning bolts are made of internal hexagonal or internal five-pointed sockets to allow the tool to penetrate deep into the expansion tube when tightening.

6. An adjustable expansion bolt, characterized in that: It includes an expansion tube, an adjusting bolt, and a tightening bolt. The expansion tube is made of plastic. The upper part of the inner wall of the expansion tube has a threaded section for the adjusting bolt to be screwed on. The expansion tube below the threaded section is segmented with gaps between the segments. The adjusting bolt has a machine thread, and the tightening bolt has a self-tapping thread. After the tightening bolt is tightened, it is located inside the expansion tube.

7. The adjustable expansion bolt according to claim 6, characterized in that, The outer wall of the expansion tube is provided with an eccentric wing to prevent the expansion tube from rotating when the tensioning bolt is tightened.

8. An adjustable expansion bolt, characterized in that: The expansion tube, including the expansion tube, adjusting bolt, and wedge-shaped tensioning bolt, is made of metal by stamping and rolling. The expansion tube has an internal thread section on the concave rib. It is used to connect with the adjusting bolt to adjust the fixed height by turning the adjusting bolt. It is also used to connect with the tensioning bolt. By turning the tensioning bolt, the wedge-shaped nut is pulled upward to open the expansion tube and fasten the expansion plug in the base material. The expansion tube below the bayonet is segmented.

9. The adjustable expansion bolt according to claim 8, characterized in that: The wedge-shaped tensioning bolt includes an integrally formed external threaded post and a frustum post; the top of the outer protruding rib of the expansion tube is outwardly flared to prevent the expansion tube from rotating when tightened.

10. An adjustable expansion bolt, characterized in that: The device includes an expansion tube, an adjusting bolt, and a tightening bolt. The expansion tube is a round tube with a continuous internal thread on its inner wall and a segmented lower part. The top wall of the round tube has an outwardly flared edge. The tightening bolt includes a screw section with a tapered head that tapers from top to bottom at the lower part of the screw section. The head of the tightening bolt is an internal hexagonal socket.

Images