CN206309723U - A kind of setscrew - Google Patents

Abstract

The utility model discloses an expansion screw, which comprises: a screw body, including a hexagonal head and a screw rod, the middle part of the screw rod is provided with a threaded part, the outer end of the screw rod is provided with a wedge-shaped head, and a gasket is set on the screw rod; an expansion sleeve, There is an internal thread matching the threaded part inside, one end passes through the wedge-shaped head and fits on the threaded part, and the other end of the expansion sleeve has a number of opening expansion gaps on the end surface, and the outer surface of the expansion sleeve Several strip-shaped convex ribs protrude from the upper interval. In the utility model, when the hexagonal head is tightened during the installation process, the wedge-shaped head of the screw will be pushed up into the expansion sleeve, and the expansion sleeve will expand due to the existence of the expansion gap, and at the same time, the strip-shaped ribs on the outer surface of the expansion sleeve It is even more tightly clamped to the wall, fixed reliably, and does not loosen; when disassembling, the entire screw body can be unscrewed, leaving only the expansion sleeve inside the wall, and the entire expansion sleeve will not be exposed to the ground Or outside the wall, it will not cause a safety hazard.

Description

an expansion screw

technical field

The utility model relates to screws, in particular to an expansion screw.

Background technique

Now the common expansion screw is fixed by using the wedge-shaped slope to promote the expansion to generate friction and grip force, so as to achieve the fixing effect. One end of the screw is threaded, the other end has a taper, and the outside is covered with an iron sheet (some are steel pipes). Half of the iron sheet cylinder (steel pipe) has a number of cuts. Put them into the hole made on the wall together, and then lock the nut, and the nut pushes the screw out. Pull, pull the taper into the iron cylinder, and the iron cylinder is expanded, so it is tightly fixed on the wall. It is generally used for fastening fences, awnings, air conditioners, etc. on cement, bricks and other materials. But its fixation is not very reliable. If the load has a large vibration, it may loosen. There are safety hazards for installing ceiling fans, etc., and when disassembling, only the head can be disassembled, and the screws cannot be pulled out completely, resulting in residual screws. Violence on the wall or on the road, causing safety hazards.

Therefore, the existing expansion screws have the problems of complicated installation, easy loosening, and potential safety hazards caused by residual screws after disassembly.

Utility model content

The technical problem to be solved by the utility model is that the existing expansion screws are complicated to install, easy to loosen, and the remaining screws after disassembly cause potential safety hazards.

In order to solve the above technical problems, the technical solution adopted by the utility model is to provide an expansion screw, including:

The screw body includes a hexagonal head and a screw rod, the middle part of the screw rod is provided with a threaded part, the outer end of the screw rod is provided with a wedge-shaped head integrally formed with the threaded part, and a gasket is set on the screw rod;

The expansion sleeve has an internal thread suitable for the threaded part on the inner side, and its open end passes through the wedge-shaped head and fits on the threaded part, and the other end of the expansion sleeve There are several open expansion gaps on the end surface, and several strip-shaped convex ribs protrude from the outer surface of the expansion sleeve at intervals.

In the above solution, the other end of the expansion sleeve is provided with a cover, and a through hole is opened in the middle of the cover, and the expansion slit passes through the through hole and extends to the middle of the side of the expansion sleeve.

In the above solution, the wedge-shaped head includes a cylindrical connecting portion connected to the threaded portion and an extruding head arranged outside the cylindrical connecting portion. The indenter matches the slope.

In the above solution, the diameter of the through hole is smaller than the diameter of the cylindrical connection part, and there is a gap between the cylindrical connection part and the inner wall of the expansion sleeve, and the expansion sleeve is set on the When on the threaded part, the outer end of the extruding head passes through the through hole.

In the above solution, the extrusion head is conical or trapezoidal.

In the above solution, the number of the expansion slits is four, and they are evenly arranged around the periphery of the through hole, and the outer surface of the expansion sleeve is located between any two of the expansion slits. The strip-shaped ribs.

In the above solution, the strip-shaped ribs are tapered, and the front ends of the strip-shaped ribs are pointed outwards.

In the above solution, a spring meson for preventing the hexagonal head from loosening is clamped between the hexagonal head and the gasket.

In the above solution, the length of the expansion sleeve is less than the sum of the lengths of the threaded portion and the wedge-shaped head.

In the above solution, the diameter of the expansion sleeve is the same as the major diameter of the screw.

In the utility model, during the installation process, when the hexagonal head is tightened, the wedge-shaped head of the screw rod will be pushed up into the expansion sleeve, and the expansion sleeve will expand due to the existence of the expansion gap, and at the same time, the outer surface of the expansion sleeve The strip-shaped ribs are more tightly clamped to the wall, and the fixation is reliable without loosening; when disassembling, the entire screw body can be unscrewed, leaving only the expansion sleeve inside the wall, the entire expansion sleeve It will not be exposed on the ground or outside the wall, and will not cause safety hazards.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation after removing expansion sleeve in the utility model;

Fig. 3 is a side sectional view of the utility model;

Fig. 4 is the front view of the open end of the expansion sleeve in the utility model;

Fig. 5 is a schematic diagram of the other end of the expansion sleeve in the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figure 1 and Figure 2, the utility model provides an expansion screw, including a screw body 1 and an expansion sleeve 4, wherein the screw body 1 includes a hexagonal head 11 and a screw rod 12, the preferred hexagonal head 11 is a hexagonal head, Easy to install and remove by screw tool. The middle part of the screw 12 is provided with a threaded part 13 , and the outer end of the screw 12 is provided with a wedge-shaped head 14 integrally formed with the threaded part 13 , and the threaded part 13 is used for threaded connection with the expansion sleeve 4 .

A washer 3 is sleeved on the screw rod 12, and a spring meson 2 for preventing the hexagonal head 11 from loosening is clamped between the hexagonal head 11 and the washer 3. When using the expansion screw, drill one end of the wedge-shaped head 14 into the installation hole of the wall or other objects. The arrangement of the gasket 3 and the spring meson 2 makes the connection and sealing between the hexagonal head 11 and the wall difficult to loosen. , improve security.

3 and 4, the expansion sleeve 4 is hollow inside, and its inner surface is provided with an internal thread that matches the threaded part 13. One end of the expansion sleeve 4 is an open end, and the open end is connected from the screw body 1. The wedge-shaped head 14 passes through and fits on the threaded part 13 in a spiral manner.

The wedge-shaped head 14 includes a cylindrical connecting portion 141 connected to the threaded portion 13 and an extruding head 142 disposed outside the cylindrical connecting portion 141 . The inner side of the expansion sleeve 4 is provided with a slope 45 compatible with the extrusion head 142 , so when the expansion sleeve 4 is installed, the inside of the expansion sleeve 4 forms a state of complete cooperation with the threaded portion 13 and the wedge-shaped head 14 .

Referring to FIG. 4 and FIG. 5 , the other end of the expansion sleeve 4 is provided with a cover 44 , and a through hole 41 is opened in the middle of the cover 44 . The diameter of the through hole 41 is smaller than the diameter of the cylindrical connecting portion 141, and there is a gap between the cylindrical connecting portion 141 and the inner wall of the expansion sleeve 4. During the extrusion process, due to the existence of the gap, it is convenient to continue to tighten the expansion sleeve. 4 Expansion occurs. The extrusion head 142 is conical or trapezoidal, and when the expansion sleeve 4 is fitted on the threaded part 13 , the outer end of the extrusion head 142 passes through the through hole 41 for a certain distance. When the extrusion head 142 adopts a tapered shape, it is more convenient to apply force during the extrusion process, and the extrusion performance is good; if the extrusion head 142 adopts a trapezoidal shape, it is convenient to carry at ordinary times and avoid hurting the user.

Preferably, the length of the expansion sleeve 4 is less than the sum of the lengths of the threaded portion 13 and the wedge-shaped head 14 . After the expansion sleeve 4 is installed, there is still a certain distance between the other end of the threaded part 13. If it is screwed hard, the screw rod 12 can still squeeze the cover 44 of the expansion sleeve 4, and the expansion sleeve 4 will be forced. swell.

The end face of the other end of the expansion sleeve 4 is provided with several opening expansion gaps 42, which are used for pressing the through hole 41 on the cover 44 through the wedge-shaped head 14 during the installation process. A setting of 42 expands, increasing the squeeze force against the object. The expansion gap 42 runs through the through hole 41 and extends to the middle of the expansion sleeve 4 . Preferably, the number of expansion slits 42 is four, evenly arranged around the periphery of the through hole 41,

A plurality of strip-shaped ribs 43 protrude from the outer surface of the expansion sleeve 4 at intervals, and a strip-shaped rib 43 is provided on the outer surface of the expansion sleeve 4 between any two expansion gaps 42 . Preferably, the strip-shaped rib 43 is tapered, and the front end of the strip-shaped rib 43 is pointed outwardly. The function of the strip-shaped rib 43 is that when the expansion sleeve 4 expands, the tapered strip-shaped rib 43 increases the friction and extrusion force between the expansion sleeve 4 and the wall or object, and clamps the wall more tightly. , to improve firmness. In addition, slipping during installation can be prevented. If there is no strip-shaped rib 43, the sleeve will easily slip during the process of tightening the screw to the sleeve.

The diameter of the expansion sleeve 4 is the same as the major diameter of the screw rod 12, and the diameter of the threaded portion 13 is smaller than the diameter of the expansion sleeve 4, so when the expansion sleeve 4 is fitted on the threaded portion 13, the entire expansion screw can maintain the same outer diameter Sex, good sealing with the mounting hole, and easy to install and disassemble.

The specific embodiment of the utility model is as follows:

During the installation process, insert the expansion screw into the installation hole, clamp the head of the expansion screw with a wrench or a special screw tool, and screw it tightly. The wedge-shaped head of the screw continues to push up into the expansion sleeve, and the cover of the expansion sleeve Extruded, and due to the existence of the expansion gap, the expansion sleeve expands outward along the through hole. At this time, the strip-shaped ribs on the outer surface of the expansion sleeve will be more squeezed and clamped to the wall or object outside the installation hole. , to improve the firmness of the clamping, so that the installation and fixing of the expansion screw is reliable and does not loosen, and the screw and the hexagonal head are all inside the wall, which will not be exposed to the sun and rain, and will not be easily weathered and rusted.

During the disassembly process, if an ordinary wrench is used, use the wrench to clamp the head of the expansion screw and screw it in the opposite direction. The screw rod and the installation hole will start to loosen, and at the same time, the threaded part and the expansion sleeve will also start to loosen and disengage. Finally, The entire screw body can be unscrewed, and the remaining expansion sleeve stays in the wall, and the entire expansion sleeve will not be exposed to the ground or the outside of the wall, and will not cause a safety hazard. If a special screw tool is used, when the screw body is screwed outward, a part of the screw rod is separated from the expansion sleeve, the wedge-shaped head no longer squeezes the expansion sleeve, and the expansion sleeve no longer expands, but at this time the expansion sleeve and the expansion sleeve There is still friction between the walls. Driven by the screw tool, the expansion sleeve will be pulled out along with the threaded part. Nothing will be trapped in the wall. The expansion sleeve can also be recycled to reduce production costs. .

The utility model is not limited to the above-mentioned best implementation mode, anyone should know that the structural changes made under the enlightenment of the utility model, all technical solutions that are the same as or similar to the utility model, all fall under the protection of the utility model within range.

Claims (10)

1. An expansion screw, characterized in that, comprising: The screw body includes a hexagonal head and a screw rod, the middle part of the screw rod is provided with a threaded part, the outer end of the screw rod is provided with a wedge-shaped head integrally formed with the threaded part, and a gasket is set on the screw rod; The expansion sleeve has an internal thread suitable for the threaded part on the inner side, and its open end passes through the wedge-shaped head and fits on the threaded part, and the other end of the expansion sleeve There are several open expansion gaps on the end surface, and several strip-shaped convex ribs protrude from the outer surface of the expansion sleeve at intervals. 2. An expansion screw according to claim 1, wherein the other end of the expansion sleeve is provided with a cover, and a through hole is opened in the middle of the cover, and the expansion gap runs through the through hole. hole and extend to the middle of the side of the expansion sleeve. 3. An expansion screw according to claim 2, wherein the wedge-shaped head comprises a cylindrical connecting portion connected to the threaded portion and an extruding head arranged outside the cylindrical connecting portion, The inner side of the expansion sleeve is provided with a slope suitable for the extrusion head. 4. An expansion screw according to claim 3, characterized in that, the diameter of the through hole is smaller than the diameter of the cylindrical connecting portion, and the distance between the cylindrical connecting portion and the inner wall of the expansion sleeve is There is a gap between them, and when the expansion sleeve is fitted on the threaded part, the outer end of the extrusion head passes through the through hole. 5. An expansion screw according to claim 3, characterized in that, the extruding head is conical or trapezoidal. 6. An expansion screw as claimed in claim 2, characterized in that, the number of the expansion slits is four, which are evenly arranged around the periphery of the through hole, and the outer surface of the expansion sleeve is located There is one strip-shaped rib between any two expansion gaps. 7 . The expansion screw according to claim 6 , wherein the strip-shaped rib is tapered, and the front end of the strip-shaped rib is pointed outwardly. 8 . 8 . The expansion screw according to claim 1 , wherein a spring meson for preventing the hexagonal head from loosening is clamped between the hexagonal head and the washer. 9 . 9. An expansion screw according to claim 1, characterized in that the length of the expansion sleeve is less than the sum of the lengths of the threaded portion and the wedge-shaped head. 10. The expansion screw according to claim 1, wherein the diameter of the expansion sleeve is the same as the major diameter of the screw rod.