Hollow wall expansion bolt

Abstract

The utility model discloses a hollow wall expansion bolt which comprises a metal block, two plastic bolt belts and a tightening ring. A receding groove is formed in one side of the metal block. A fixing bolt communicated with the clearance groove is arranged on the other side of the metal block; one ends of the two plastic tying belts are symmetrically hinged in the clearance groove; a plurality of first one-way helical teeth are continuously arranged on the inner sides of the two plastic tying belts; the tooth ends of the first one-way helical teeth are obliquely arranged in the direction close to the metal block; the tightening ring comprises an outer ring and an inner ring; the outer ring is arranged on the outer sides of the two plastic tying belts in a sliding and sleeving mode. The inner ring is arranged on the inner side of the outer ring, and the inner ring is arranged between the two plastic tying belts in a friction mode. Second one-way helical teeth are arranged on the outer side of the inner ring; the second one-way helical teeth can be meshed with the first one-way helical teeth; and the tooth end orientation of the second one-way helical teeth is opposite to the tooth end orientation of the first one-way helical teeth.

Description

Technical Field

[0001] The utility model belongs to the technical field of expansion bolts, and in particular relates to a hollow wall expansion bolt. Background Art

[0002] Heavy-duty expansion bolts for hollow walls are designed to install different products on hollow walls, carry different weights, and have different wall thicknesses. Hollow wall expansion bolts can effectively solve the problem of installing heavy objects, LCD TVs, wall-mounted TVs, air-conditioning indoor units, water heaters, large photo frames, load-bearing brackets, cabinets and other home appliances on hollow walls.

[0003] When using existing expansion bolts, the entire expansion bolt usually needs to be driven into the wall, which is inconvenient to fix on hollow brick walls; some expansion bolts suitable for hollow walls have the disadvantage that the tightening ring is easy to move back and forth on the plastic bolt belt, which has the hidden danger of weakening the installation and fixation of objects. Utility Model Content

[0004] The utility model provides a hollow wall expansion bolt to solve the above technical problems.

[0005] The solution adopted by the utility model to achieve its technical effect is:

[0006] A hollow wall expansion bolt comprises a metal block, two plastic bolt straps and a tightening ring; a void groove is arranged on one side of the metal block; a fixing bolt connected to the void groove is arranged on the other side of the metal block; one end of the two plastic bolt straps is symmetrically hinged in the void groove; a plurality of first unidirectional bevel teeth are continuously arranged on the inner sides of the two plastic bolt straps; the tooth ends of the first unidirectional bevel teeth are inclined in a direction close to the metal block; the tightening ring comprises an outer ring and an inner ring; the outer ring is slidably sleeved on the outer sides of the two plastic bolt straps; the inner ring is arranged on the inner side of the outer ring, and the inner ring is frictionally arranged between the two plastic bolt straps; second unidirectional bevel teeth are arranged on the outer side of the inner ring; the second unidirectional bevel teeth can mesh with the first unidirectional bevel teeth; the tooth ends of the second unidirectional bevel teeth are oriented opposite to the tooth ends of the first unidirectional bevel teeth.

[0007] Preferably, a plastic block is provided at one end of each of the plastic straps; a hook plate is provided on the inner side of the two plastic blocks; the two hook plates are slidably engaged with each other, so that the two plastic blocks are slidably connected to each other.

[0008] Preferably, guide slide plates are provided on the inner sides of the two plastic blocks; any one of the inverted hook plates is slidably disposed between the inverted hook plate on the other plastic block and the guide slide plate.

[0009] Preferably, an opening is provided on the outer side of the plastic block; the inverted hook plate and the guide slide plate are located on both sides of the opening; and the inverted hook surface of the inverted hook plate faces the opening.

[0010] Preferably, a mounting rod is provided at one end of the plastic strap; a guide groove is provided between the outer ring and the inner ring, and the guide groove can be slidably mounted on the outside of the plastic strap; a mounting opening connected to the guide groove is provided on the outside of the outer ring; the mounting rod can pass through the mounting opening and enter the guide groove.

[0011] Preferably, parallel guide rods are provided at the top and bottom of the plastic strap; parallel guide grooves are provided at both ends of the guide groove; and the parallel guide grooves can be slidably sleeved on the outer sides of the parallel guide rods.

[0012] Preferably, a section of the plastic strap close to the mounting rod is a to-be-determined section; a third unidirectional bevel tooth having the same orientation as the first unidirectional bevel tooth is provided on the inner side of the to-be-determined section close to the mounting rod; and there is no bevel tooth structure on the inner side of the to-be-determined section between the third unidirectional bevel tooth and the first unidirectional bevel tooth.

[0013] Preferably, anti-compression grooves are arranged on the inner sides of both ends of the outer ring away from the two plastic straps; and reinforcing ribs are arranged in the anti-compression grooves.

[0014] Preferably, a positioning plate is provided on the outer side of one end of the outer ring.

[0015] The beneficial effects of the utility model are as follows: the utility model can rotate the plastic tie strap to be flush with the metal block, quickly send the metal block to the inside of the hollow wall for positioning and flushing, then quickly push the tightening ring to be flush with the outer wall of the hollow wall and cut off the excess plastic tie strap, and finally, through the cooperation of the bolt, the tightening ring, the remaining plastic tie strap and the fixing bolt, the object to be installed can be firmly installed on the outer wall of the hollow wall. It can be seen that the utility model is convenient and fast to use, and the objects are firmly fixed; the inner sides of the two plastic tie straps are provided with first unidirectional bevel teeth with tooth ends inclined in the direction close to the metal block, and the outer side of the inner ring of the tightening ring is provided with second unidirectional bevel teeth facing the tooth ends opposite to the first unidirectional bevel teeth. The tightening ring is convenient to push in the direction of the metal block, and will not easily retreat after being pushed into place, thereby further improving the installation firmness of the object. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of the expansion plug disclosed in the embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the expansion bolt disclosed in the embodiment of the utility model without a plastic bolt strap;

[0018] Figure 3This is a schematic diagram of a tightening ring disclosed in an embodiment of the utility model.

[0019] Label description: 1-metal block, 2-plastic strap, 3-fixing bolt, 4-first one-way bevel tooth, 5-outer ring, 6-inner ring, 7-second one-way bevel tooth, 8-plastic block, 9-hook plate, 10-guide slide plate, 11-opening, 12-mounting rod, 13-guide groove, 14-parallel guide rod, 15-parallel guide groove, 16-third one-way bevel tooth, 17-reinforcement rib, 18-positioning plate. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. It should be noted that when an element is referred to as "fixed on" or "set on" another element, it can be directly on the other element or there may be a centering element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there may be a centering element at the same time. When an element is referred to as being "fixedly connected to" another element, it can be a common fixed connection method such as welding, bolting or gluing.

[0021] Please refer to Figure 1-3 The utility model discloses a hollow wall expansion bolt in a preferred embodiment, comprising a metal block 1, two plastic bolt straps 2 and a tightening ring; a hollow groove is arranged on one side of the metal block 1; a fixing bolt 3 connected to the hollow groove is arranged on the other side of the metal block 1; one end of the two plastic bolt straps 2 is symmetrically hinged in the hollow groove; a plurality of first one-way bevel teeth 4 are arranged in a row on the inner sides of the two plastic bolt straps 2; the tooth ends of the first one-way bevel teeth 4 are inclined in a direction close to the metal block 1; the tightening ring comprises an outer ring 5 and an inner ring 6; the outer ring 5 is slidably sleeved on the outer sides of the two plastic bolt straps 2; the inner ring 6 is arranged on the inner side of the outer ring 5, and the inner ring 6 is frictionally arranged between the two plastic bolt straps 2; a second one-way bevel tooth 7 is arranged on the outer side of the inner ring 6; the second one-way bevel tooth 7 can mesh with the first one-way bevel tooth 4; the tooth ends of the second one-way bevel teeth 7 are opposite to the tooth ends of the first one-way bevel teeth 4.

[0022] Specifically, a plastic block 8 is provided at one end of each of the plastic straps 2; a hook plate 9 is provided on the inner sides of the two plastic blocks 8; the two hook plates 9 are slidably engaged with each other, so that the two plastic blocks 8 are slidably connected to each other.

[0023] Specifically, the inner sides of the two plastic blocks 8 are both provided with guide slide plates 10 ; any one of the inverted hook plates 9 is slidably disposed between the inverted hook plate 9 on the other plastic block 8 and the guide slide plate 10 .

[0024] Specifically, an opening 11 is formed on the outer side of the plastic block 8 ; the inverted hook plate 9 and the guide slide plate 10 are located on both sides of the opening 11 ; and the inverted hook surface of the inverted hook plate 9 faces the opening 11 .

[0025] As can be seen from the above, the mutual interlocking of the inverted hook plates 9 can prevent the two plastic blocks 8 from separating; the inverted hook plate 9 slides between the other inverted hook plate 9 and the guide slide plate 10 to ensure smooth and stable sliding cooperation between the two plastic blocks 8; the plastic block 8 is provided with an opening 11 facing the inverted hook of the inverted hook plate 9. After the plastic block 8 is injection molded, the inverted hook on the inverted hook plate 9 can be observed through the opening 11. If there is more material, the excess injected plastic can be scraped off or cut off through the opening 11.

[0026] Specifically, a mounting rod 12 is provided at one end of the plastic tether 2; a guide groove 13 is provided between the outer ring 5 and the inner ring 6, and the guide groove 13 can be slidably sleeved on the outer side of the plastic tether 2; a mounting opening connected to the guide groove 13 is provided on the outer side of the outer ring 5; the mounting rod 12 can pass through the mounting opening and enter the guide groove 13. The outer ring 5 is clamped between the two mounting rods 12, and the mounting rod 12 is passed through the mounting opening and enters the guide groove 13. After that, the guide groove 13 is moved forward along the mounting rod 12 and sleeved on the outer side of the plastic tether 2, so that the installation of the tightening ring is realized, which is very convenient.

[0027] Specifically, parallel guide rods 14 are provided at the top and bottom of the plastic tie 2; parallel guide grooves 15 are provided at both ends of the guide groove 13; the parallel guide grooves 15 can be slidably sleeved on the outside of the parallel guide rods 14. The parallel guide rods 14 and the parallel guide grooves 15 cooperate to make the tightening ring advance more parallel and stable. The top surfaces of the parallel guide rods 14 are parallel, which is more convenient for cutting or cutting with shearing tools.

[0028] Specifically, a section of the plastic strap 2 close to the mounting rod 12 is a waiting section; the waiting section close to the mounting rod 12 is provided with a third one-way bevel tooth 16 in the same direction as the first one-way bevel tooth 4 on the inner side; the waiting section between the third one-way bevel tooth 16 and the first one-way bevel tooth 4 has no bevel tooth structure. When installing the tightening ring, the second one-way bevel tooth 7 needs to be meshed with the third one-way bevel tooth 16 before the tightening ring can be put on the waiting section of the plastic strap 2 by the mounting rod 12. After that, the tightening ring will remain on the waiting section until it is put into operation, which can prevent the tightening ring from falling off the plastic strap 2 on the one hand, and prevent the second one-way bevel tooth 7 from always being in meshing state with the first one-way bevel tooth 4 on the other hand, so as to prevent the first one-way bevel tooth 4 and the second one-way bevel tooth 7 from being squeezed, rubbed and worn before operation.

[0029] Specifically, compression grooves are provided on the inner sides of the two ends of the outer ring 5 away from the two plastic bolt straps 2, and reinforcing ribs 17 are provided in the compression grooves, which can improve the compression strength of the tightening ring inserted into the installation hole of the hollow wall and improve the service life of the expansion bolt.

[0030] Specifically, a positioning plate 18 is disposed on the outer side of one end of the outer ring 5 to push the tightening ring to move and finally position it close to the outer wall surface of the hollow wall.

[0031] Working process: slide the two plastic blocks 8 in opposite directions so that the front ends of the two plastic tie bands 2 are close together and embedded in the air avoidance groove and flush with the metal block 1, so as to facilitate the metal block 1 to pass through the hole into the hollow wall; slide the two plastic blocks 8 flush, pull the two plastic tie bands 2 flush, thereby driving the metal block 1 to be flush with the inner wall of the hollow wall, and then push the tightening ring into the hole to make the positioning plate 18 flush and locked with the outer wall of the hollow brick; cut the plastic tie band 2 flush with the positioning plate 18; place the object to be installed flat against the outer wall of the hollow wall and the positioning plate 18, and align the screw hole of the object to be installed with the ring mouth of the inner ring 6, thread the installation bolt through the screw hole, and then pass it through the inner ring 6, then squeeze the remaining plastic tie band 2 to make it expand and die in the hole, and finally thread it through the fixing bolt 3, so that the object to be installed is firmly installed on the outer wall of the air wall.

[0032] It can be seen from the above description that the utility model is convenient and quick to use, and can make the objects be installed firmly.

[0033] The preferred embodiments of the present invention are described in detail above in conjunction with the drawings in the specification. It should be noted that the protection scope of the present invention includes but is not limited to the above embodiments. The specific structures disclosed in the drawings in the specification are only preferred embodiments of the present invention. Technical personnel in the field can also develop other embodiments on this basis. Any simple deformation or equivalent substitution that does not deviate from the innovative concept of the present invention is covered by the present invention and belongs to the protection scope of the present invention.

Claims

1. A hollow wall expansion plug, characterized in that: include: A metal block; a void-avoiding groove is provided on one side of the metal block; a fixing bolt connected to the void-avoiding groove is provided on the other side of the metal block; Two plastic straps; one end of the two plastic straps is symmetrically hinged in the air avoidance groove; a plurality of first unidirectional oblique teeth are arranged in a continuous arrangement on the inner sides of the two plastic straps; the tooth ends of the first unidirectional oblique teeth are inclined toward the direction close to the metal block; A tightening ring; the tightening ring comprises an outer ring and an inner ring; the outer ring is slidably sleeved on the outer sides of the two plastic straps; the inner ring is arranged on the inner side of the outer ring, and the inner ring is frictionally arranged between the two plastic straps; a second unidirectional bevel tooth is arranged on the outer side of the inner ring; the second unidirectional bevel tooth can mesh with the first unidirectional bevel tooth; the tooth end of the second unidirectional bevel tooth is oriented in the opposite direction to the tooth end of the first unidirectional bevel tooth.

2. A hollow wall expansion plug according to claim 1, characterized in that: A plastic block is arranged at one end of each of the plastic straps; a hook plate is arranged on the inner sides of the two plastic blocks; the two hook plates are slidably engaged with each other, so that the two plastic blocks are slidably connected to each other.

3. A hollow wall expansion plug according to claim 2, characterized in that: The inner sides of the two plastic blocks are both provided with guide slides; any one of the inverted hook plates is slidably arranged between the inverted hook plate on the other plastic block and the guide slide.

4. The hollow wall expansion plug according to claim 3, characterized in that: An opening is provided on the outer side of the plastic block; the inverted hook plate and the guide slide plate are located on both sides of the opening; and the inverted hook surface of the inverted hook plate faces the opening.

5. The hollow wall expansion plug according to claim 1, characterized in that: A mounting rod is provided at one end of the plastic strap; a guide groove is provided between the outer ring and the inner ring, and the guide groove can be slidably mounted on the outside of the plastic strap; a mounting opening connected to the guide groove is provided on the outside of the outer ring; the mounting rod can pass through the mounting opening and enter the guide groove.

6. The hollow wall expansion plug according to claim 5, characterized in that: The top and bottom of the plastic strap are provided with parallel guide rods; both ends of the guide groove are provided with parallel guide grooves; the parallel guide grooves can be slidably sleeved on the outer sides of the parallel guide rods.

7. The hollow wall expansion plug according to claim 5, characterized in that: A section of the plastic strap close to the mounting rod is a to-be-determined section; a third unidirectional bevel tooth having the same orientation as the first unidirectional bevel tooth is provided on the inner side of the to-be-determined section close to the mounting rod; there is no bevel tooth structure on the inner side of the to-be-determined section between the third unidirectional bevel tooth and the first unidirectional bevel tooth.

8. The hollow wall expansion plug according to claim 1, characterized in that: The inner sides of the two ends of the outer ring away from the two plastic straps are provided with compression-resistant grooves; and reinforcing ribs are provided in the compression-resistant grooves.

9. The hollow wall expansion plug according to claim 1, characterized in that: A positioning plate is arranged on the outer side of one end of the outer ring.

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