CN206694372U - A kind of setscrew - Google Patents

Abstract

The utility model discloses an expansion screw, which comprises an expansion plate, a movable bracket screw rod and a fixed top piece, the movable bracket screw rod includes a U bracket part and a screw rod part, and a first U-shaped groove is formed on the U bracket part The fixed top piece includes a push rod part and a fixed bracket part, and the fixed bracket part forms a second U-shaped groove; the second U-shaped groove of the fixed top piece passes through the first U-shaped groove sleeve of the screw rod of the movable bracket On the first U-shaped groove, the screw part is located in the second U-shaped groove, and the push rod part is located in the first U-shaped groove; a plane washer is set under the screw part, and the plane washer A nut is installed under the sheet. When the load is heavier, the utility model will pull the screw rod outward, relatively, the push rod part will push inward, and the expansion plate will only be supported more and more, so that it will become more and more firm and not easy to fall off .

Description

an expansion screw

technical field

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

Background technique

Expansion screws generally use metal expansion screws, and the expansion screw is fixed by using the wedge-shaped slope to promote the expansion to generate friction and grip force to achieve the fixing effect. It is generally used for fastening fences, awnings, air conditioners, etc. on cement, bricks and other materials. It can also be used in loose matrix or wall materials such as hollow bricks, porous bricks, and honeycomb bricks.

Although the expansion screw is a relatively traditional process, and the technology is relatively mature in all aspects, it still has certain shortcomings: its fixation is not very reliable. If the load has a large vibration or the load is too heavy, the expansion screw will be damaged if it is used for a long time. Falling off, especially when it is applied to walls such as hollow bricks, porous bricks, and honeycomb bricks, the above phenomenon is more likely to occur.

Therefore, it is necessary to further improve the existing expansion screws so that the screws are not easy to fall off when the load is too heavy.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide an expansion screw with simple structure, heavy load and not easy to fall off.

In order to achieve the above object, the utility model is achieved in that an expansion screw includes an expansion plate, a movable bracket screw rod and a fixed top piece, the movable bracket screw rod includes a U bracket part and a screw rod part, and the U bracket part A first U-shaped groove is formed on the top; the fixed top piece includes a push rod part and a fixed bracket part, and the fixed bracket part forms a second U-shaped groove;

The second U-shaped groove of the fixed top part passes through the first U-shaped groove of the screw rod of the movable bracket and is sleeved on the first U-shaped groove so that the screw part is located in the second U-shaped groove, and the push rod part located in the first U-shaped groove;

The expansion plate is installed on the upper end of the first U-shaped groove; a plane gasket is set under the screw part, and a nut is installed under the plane gasket;

When the nut is tightened, the screw part drives the U bracket part and the expansion plate to pull outwards as a whole, and the opposite push rod part pushes toward the expansion plate. When the push rod part touches the expansion plate, The expansion plate is slowly expanded by the push rod part.

Preferably, the U bracket part at the upper end and the screw part at the lower end of the screw rod of the movable bracket are integrally formed.

Preferably, the top rod part and the fixed bracket part of the fixed top part are integrally formed.

Preferably, the expansion plate is connected to the U bracket part through a locking pin.

Preferably, the expansion panels are a pair of diamond-shaped panels with tapered ends. When they are close together, the two diamond-shaped panels overlap in parallel. When they are opened, the expansion panels slowly transition from an "X" shape to a "one" shape.

Preferably, two ends of the expansion plate are provided with barbs.

Preferably, elastic mesons are arranged between the plane washer and the nut.

Beneficial effects of the utility model: when the nut is tightened in the utility model, the screw part drives the U bracket part and the expansion plate to pull outward as a whole, and the opposite push rod part pushes toward the expansion plate. When the ejector rod part touches the expansion plate, the expansion plate is slowly stretched by the ejector rod part, so that when the load is heavier, it will pull the screw rod outward, and relatively, the ejector rod part will move toward In the top, the expansion board will only be supported more and more, so it will become more and more firm and not easy to fall off. At the same time, the utility model is widely used, not only can be used in hard wall materials, but also very suitable for hollow bricks, porous bricks, Loose substrates or walls such as honeycomb bricks.

Description of drawings

Fig. 1 is the overall structure schematic diagram of a kind of expansion screw of the utility model;

Fig. 2 is the explosion diagram of a kind of expansion screw of the present utility model;

Fig. 3 is a schematic diagram of the slightly open state structure of an expansion screw of the utility model;

Fig. 4 is a schematic structural diagram of a half-open state of an expansion screw of the present invention;

Fig. 5 is a schematic diagram of the fully open state structure of an expansion screw of the present invention;

Fig. 6 is a schematic diagram of the structure of the utility model movable bracket screw rod;

Fig. 7 is a structural schematic diagram of the fixed top piece of the present invention.

The corresponding labels of the components in the accompanying drawings: expansion plate 1, movable bracket screw rod 2, U bracket part 21, screw rod part 22, first U-shaped groove 23, fixed top piece 3, ejector rod part 31, fixed bracket part 32, The second U-shaped groove 33, the flat gasket 4, the nut 5, the locking pin 6, the barb 7, and the elastic meson 8.

detailed description

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model will be further described.

As shown in Figures 1-7, an expansion screw includes an expansion plate 1, a movable bracket screw rod 2 and a fixed top piece 3, the movable bracket screw rod 2 includes a U bracket part 21 and a screw part 22, and the U bracket part 21 It is integrally formed with the screw part 22 at the lower end, and the integral forming here is formed by stamping or injection molding at one time, which reduces the production cost. The first U-shaped groove 23 is formed on the U bracket part 21; the fixed top piece 3 includes a push rod part 31 and a fixed bracket part 32, and the push rod part 31 and the fixed bracket part 32 are integrally formed, and the push rod part 31 The integral molding with the fixed bracket part 32 is also formed by stamping or injection molding at one time, which reduces the production cost again. The fixed bracket part 32 forms a second U-shaped groove 33; the second U-shaped groove 33 of the fixed top part passes through the first U-shaped groove 23 of the movable bracket screw rod and is sleeved on the first U-shaped groove 23 so that The screw part is located in the second U-shaped groove 33, and the push rod part is located in the first U-shaped groove 23;

The expansion plate 1 is installed on the upper end of the first U-shaped groove 23, and the expansion plate 1 is connected with the U bracket part 11 through the locking pin 6. When the expansion plate 1 is closed, a part of the expansion plate 1 is exposed beyond the The first U-shaped groove 23 is exposed outside the first U-shaped groove 23 , specifically, one-third of the length of the expansion plate 1 is located outside the first U-shaped groove 23 .

A plane washer 4 is sheathed under the screw part 22 , and a nut 5 is installed under the plane washer 4 . When the nut 5 is tightened, the screw part 22 drives the U bracket part 11 and the expansion plate 1 to pull outward as a whole, relatively, the ejector part 31 pushes toward the direction of the expansion plate 1, when the ejector rod When the part 31 hits the expansion plate 1, the expansion plate 1 is slowly expanded by the push rod part 31.

The expansion plate 1 is a pair of diamond-shaped plates with tapered ends. When they are close together, the two diamond-shaped plates overlap in parallel. When opened, the expansion plate 1 slowly transitions from the shape of "X" to the shape of "one". The utility model is applied in Hollow bricks, porous bricks, honeycomb bricks and other loose matrix or wall materials can be supported to the shape of "one".

The larger the expansion plate 1 is stretched, the more firmly the screws are fixed. Barbs 7 are provided at both ends of the expansion plate 1, and the barbs 7 can further increase the overall stability and firmness of the expansion screw. In addition, an elastic meson 8 is arranged between the plane gasket 4 and the nut 5, and the elastic meson 8 prevents the nut 5 from loosening.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also change and modify the above embodiment. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (7)

1. An expansion screw, characterized in that it comprises an expansion plate, a movable bracket screw rod and a fixed top piece, the movable bracket screw rod comprises a U bracket portion and a screw rod portion, and the first U-shaped bracket is formed on the U bracket portion Slot; the fixed top piece includes a push rod portion and a fixed support portion, and the fixed support portion forms a second U-shaped groove; The second U-shaped groove of the fixed top part passes through the first U-shaped groove of the screw rod of the movable bracket and is sleeved on the first U-shaped groove so that the screw part is located in the second U-shaped groove, and the push rod part located in the first U-shaped groove; The expansion plate is installed on the upper end of the first U-shaped groove; a plane gasket is set under the screw part, and a nut is installed under the plane gasket; When the nut is tightened, the screw part drives the U bracket part and the expansion plate to pull outwards as a whole. Relatively, the ejector rod part pushes toward the expansion plate. When the ejector rod part touches the expansion plate, the The expansion plate is slowly stretched by the push rod part. 2. A kind of expansion screw according to claim 1, characterized in that, the U bracket portion at the upper end of the movable bracket screw rod and the screw rod portion at the lower end are integrally formed. 3. An expansion screw according to claim 1, characterized in that, the push rod part and the fixing bracket part of the fixing top part are integrally formed. 4 . The expansion screw according to claim 1 , wherein the expansion plate is connected to the U bracket part through a locking pin. 5. An expansion screw as claimed in claim 4, characterized in that, the expansion plates are a pair of diamond-shaped plates with tapered ends, when they are closed together, the two diamond-shaped plates overlap in parallel, and when opened, the expansion plates are defined by an "X" The shape slowly transitions to the shape of "one". 6. An expansion screw according to claim 5, characterized in that barbs are provided at both ends of the expansion plate. 7. An expansion screw according to claim 5, characterized in that elastic mesons are arranged between the plane washer and the nut.