CN218598570U - Self-tapping screw with bidirectional expansion structure - Google Patents

Abstract

The utility model discloses a self tapping screw with two-way expansion structure, including spiral shell head and an internal thread section of thick bamboo, the bottom fixedly connected with self tapping screw rod of spiral shell head. This self tapping screw with two-way expanding structure is through being provided with flip, hide the box, the joint piece, joint groove and hinge, when using, rotate self tapping screw through the spiral shell head, make self tapping screw attack after the inside of internal thread section of thick bamboo and expansion cylinder automatically, the spiral shell head can automatic get into the inside of hiding the box, cover flip this moment, and make the joint piece inlay on the flip joint inslot portion on hiding the box, can hide the protection at flip and the airtight box body of hiding the box formation with the spiral shell head, can hide the protection to the spiral shell head after the installation is accomplished like this, not only strengthen pleasing to the eye effect, and avoid the spiral shell head to take place the corrosion, increase of service life, it is that the installation is accomplished the back spiral shell head and directly exposes externally to solve, not only influence pleasing to the eye, and the spiral shell head takes place the corrosion easily, influence life's problem.

Description

Self-tapping screw with bidirectional expansion structure

Technical Field

The utility model relates to a self tapping expansion screw technical field specifically is a self tapping screw with two-way expansion structure.

Background

The expansion screw is generally a metal expansion screw, and the expansion screw is fixed by utilizing wedge-shaped inclination to promote expansion to generate friction bond force so as to achieve the fixing effect. The expansion screw generally comprises a screw and a nut, an expansion pipe is wrapped outside the screw, a notch is formed in the front end of the expansion pipe, the screw and the nut are plugged into a hole drilled in a wall, then the nut is locked, the screw is pulled outwards by the nut, the taper is pulled into the iron sheet cylinder, the expansion pipe is propped open, and then the expansion pipe is tightly fixed on the wall and is generally used for fastening protective guards, awnings, air conditioners and the like on materials such as cement, bricks and the like.

According to the application number CN202021010923.2, a self-tapping expansion screw with an improved structure comprises a screw head (1) and an expansion pipe self-tapping screw (2), wherein the front end of the screw head (1) is provided with a conical head turning cover (3), the tail part of the screw head (1) is provided with a section of thread internal thread barrel (4), the expansion pipe is sleeved on the screw head (1), and the thread section of the screw head (1) is sleeved with a nut anti-skidding tooth block (5); a step disc opening (6) is formed in one end, far away from the conical head turning cover (3), of the expansion pipe self-tapping screw (2), the step disc opening (6) and the expansion pipe self-tapping screw (2) are integrally formed, and the outer end of the step disc opening (6) is connected with a flange expansion cylinder (7) in a welded mode; the outer diameter of the flange plate expansion cylinder (7) is larger than that of the step plate opening (6); when the self-tapping screw (2) of the expansion pipe is inserted into the installation body, the flange expansion cylinder (7) is erected on the surface of the installation body by the step disc opening (6); the front end of the conical head flip (3) is also provided with a self-tapping head (301). The expansion screw has the beneficial effect that the expansion pipe is easier to take out.

However, after the self-tapping expansion screw is installed, the screw head is directly exposed outside, so that the appearance is influenced, and the screw head is easily corroded to influence the service life.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a self tapping screw with two-way expanded structure to the spiral shell head directly exposes externally after solving the installation completion that proposes in the above-mentioned background art, not only influences beautifully, and the spiral shell head takes place the corrosion easily moreover, influences life's problem.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a self tapping screw with two-way expansion structure, includes spiral shell head and an internal thread section of thick bamboo, the bottom fixedly connected with self tapping screw rod of spiral shell head, the bottom fixedly connected with expansion cylinder of an internal thread section of thick bamboo, the box is hidden to the top fixedly connected with of an internal thread section of thick bamboo, hide one side fixedly connected with hinge of box, the activity is articulated on the hinge has flip, the one end fixedly connected with joint piece of flip one side, hide the one end of box one side and seted up the joint groove.

Preferably, the clamping blocks correspond to the clamping grooves, and a clamping structure is formed between the clamping blocks and the clamping grooves.

Preferably, the self-tapping screw rod penetrates through the inner part of the internal thread cylinder, and the thread on the outer part of the self-tapping screw rod is matched with the thread on the inner part of the internal thread cylinder.

Preferably, openings are respectively formed in two ends of the expansion cylinder, and anti-skidding tooth blocks are respectively and uniformly arranged on two sides of the expansion cylinder.

Preferably, the outer part of the internal thread cylinder is fixedly connected with positioning strips, and four groups of positioning strips are arranged on the outer part of the internal thread cylinder at equal intervals.

Preferably, the bottom end of the screw head is fixedly connected with a gasket, and a rubber ring is bonded and fixed at the edge position of the bottom end of the gasket.

Compared with the prior art, the beneficial effects of the utility model are that: the self-tapping screw with the bidirectional expansion structure not only can hide and protect the screw head after installation is completed, but also can enhance the attractive effect, avoid the screw head from being rusted, prolong the service life, realize that the installation and the positioning of the expansion cylinder are firmer, and the self-tapping screw can not rotate along with the screw under the action of friction force when the screw is screwed in, is more convenient for stable installation, can limit the screw head through the gasket, and increases the friction force after locking while protecting the gasket, so that the screw is not easy to loosen;

(1) When the hidden box is used, the self-tapping screw is rotated through the screw head, the self-tapping screw is automatically tapped into the internal thread cylinder and the expansion cylinder, the screw head can automatically enter the hidden box, the flip cover is covered at the moment, the clamping block on the flip cover is clamped and embedded in the clamping groove on the hidden box, and the screw head can be hidden and protected in a closed box body formed by the flip cover and the hidden box, so that the screw head can be hidden and protected after the hidden box is installed, the attractive effect is enhanced, the screw head is prevented from being corroded, and the service life is prolonged;

(2) By arranging the anti-skidding tooth blocks and the positioning strips, when the anti-skidding thread blocks and the positioning strips are used, after the internal thread cylinder and the expansion cylinder are installed in the installation hole, the positioning strips outside the internal thread cylinder can be embedded into the hole wall to stably position the internal thread cylinder, and the self-tapping screw cannot rotate along with the self-tapping screw under the action of friction force when the self-tapping screw is screwed in, so that the anti-skidding thread blocks on the two sides of the expansion cylinder are more convenient to stably install, higher friction force can be generated between the expansion cylinder and the hole wall after expansion, and the fastening effect is more stable;

(3) Through being provided with gasket and rubber circle, when using, the spiral shell head gets into after hiding the inside of box, and the gasket is hugged closely with the bottom of hiding the box inside, and it is spacing to it through the area of stress that increases spiral shell head bottom to the setting of rubber circle not only can avoid the gasket to take place wearing and tearing, can also improve the frictional force of gasket, can carry on spacingly to the spiral shell head through the gasket like this, and the rubber circle increases the frictional force after the locking in the protection gasket, makes the difficult emergence of screw not hard up.

Drawings

FIG. 1 is a schematic view of the front cross-sectional structure of the present invention;

FIG. 2 is a schematic view of the gasket of the present invention viewed from the bottom;

fig. 3 is a schematic front sectional view of the hidden box of the present invention when the flip cover is closed;

fig. 4 is an enlarged schematic view of the front section of the screw head of the present invention.

In the figure: 1. a screw head; 2. a self-tapping screw; 3. a cover is turned; 4. an internal thread cylinder; 5. an anti-slip tooth block; 6. an opening; 7. an expansion cylinder; 8. a positioning bar; 9. a hidden box; 10. a gasket; 11. a rubber ring; 12. a clamping block; 13. a clamping groove; 14. and (7) a hinge.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: referring to fig. 1-4, a self-tapping screw with a bidirectional expansion structure comprises a screw head 1 and an internal thread cylinder 4, wherein a self-tapping screw 2 is fixedly connected to the bottom end of the screw head 1, an expansion cylinder 7 is fixedly connected to the bottom end of the internal thread cylinder 4, a hidden box 9 is fixedly connected to the top end of the internal thread cylinder 4, a hinge 14 is fixedly connected to one side of the hidden box 9, a flip 3 is movably hinged to the hinge 14, a clamping block 12 is fixedly connected to one end of one side of the flip 3, a clamping groove 13 is formed in one end of one side of the hidden box 9, the self-tapping screw 2 penetrates through the internal thread cylinder 4, and threads on the outer portion of the self-tapping screw 2 are matched with threads inside the internal thread cylinder 4;

the clamping blocks 12 correspond to the clamping grooves 13, and a clamping structure is formed between the clamping blocks 12 and the clamping grooves 13;

specifically, as shown in fig. 1 and fig. 3, through the spiral shell head 1 rotation self-tapping screw rod 2, make self-tapping screw rod 2 attack after the inside of internal thread section of thick bamboo 4 and inflation section of thick bamboo 7 automatically, spiral shell head 1 can get into the inside of hiding box 9 automatically, cover flip 3 this moment, and make the joint piece 12 inlay card on flip 3 inside the joint groove 13 on hiding box 9, can hide protection in flip 3 and the airtight box body of hiding box 9 formation with spiral shell head 1, can hide the protection to spiral shell head 1 after the installation is accomplished like this, not only strengthen pleasing to the eye effect, and avoid spiral shell head 1 to take place the corrosion, increase of service life.

Example 2: openings 6 are respectively formed in two ends of an expansion cylinder 7, anti-skidding tooth blocks 5 are respectively and uniformly arranged on two sides of the expansion cylinder 7, positioning strips 8 are fixedly connected to the outside of the internal thread cylinder 4, and four groups of positioning strips 8 are arranged on the outside of the internal thread cylinder 4 at equal intervals;

specifically, as shown in fig. 1, after installing the mounting hole with an internal thread section of thick bamboo 4 and an expansion cylinder 7 into, the outside location strip 8 of an internal thread section of thick bamboo 4 can imbed in the pore wall, fix a position the internal thread section of thick bamboo 4 firmly, can not follow self-tapping screw 2 and take place to rotate under the effect of frictional force when self-tapping screw 2 twists, the firm installation of being convenient for more, and the setting up of 7 both sides anti-skidding tooth pieces 5 of an expansion cylinder can make the expansion cylinder 7 expand after and have higher frictional force between the pore wall, fastening effect is more stable.

Example 3: the bottom end of the screw head 1 is fixedly connected with a gasket 10, and a rubber ring 11 is fixedly bonded at the edge position of the bottom end of the gasket 10;

specifically, as shown in fig. 1, fig. 2 and fig. 4, after the screw head 1 enters the inside of the hidden box 9, the gasket 10 is tightly attached to the bottom end of the inside of the hidden box 9, the bottom of the screw head 1 is limited by increasing the stressed area, and the rubber ring 11 is arranged to avoid the abrasion of the gasket 10 and improve the friction force of the gasket 10, so that the screw head 1 can be limited by the gasket 10, and the rubber ring 11 increases the friction force after locking while protecting the gasket 10, so that the screw is not easy to loosen.

The working principle is as follows: when the utility model is used, after the internal thread cylinder 4 and the expansion cylinder 7 are arranged in the mounting hole, the positioning strip 8 outside the internal thread cylinder 4 can be embedded into the hole wall to stably position the internal thread cylinder 4, the self-tapping screw 2 can not rotate under the action of friction force when being screwed in, the installation is more convenient to be stable, and the anti-slip tooth blocks 5 on the two sides of the expansion cylinder 7 can ensure that the expansion cylinder 7 has higher friction force with the hole wall after expanding, the self-tapping screw 2 is rotated through the screw head 1, after the self-tapping screw 2 automatically taps into the internal thread cylinder 4 and the expansion cylinder 7, the screw head 1 can automatically enter into the hidden box 9, at the moment, the gasket 10 is tightly attached to the bottom end inside the hidden box 9, and the bottom of the screw head 1 is limited by increasing the stress area at the bottom of the screw head 1, and the setting of rubber ring 11 not only can avoid gasket 10 to take place wearing and tearing, can also improve gasket 10's frictional force, then cover flip 3, and make the joint piece 12 inlay card on flip 3 inside hiding the joint groove 13 on the box 9, can hide protection in flip 3 and the airtight box body of hiding the box 9 formation with spiral shell 1, can hide protection to spiral shell 1 after this self tapping screw installation with two-way expanding structure is accomplished, not only strengthen pleasing to the eye effect, and avoid spiral shell 1 to take place the corrosion, prolonged service life, and can carry on spacingly to spiral shell 1 through gasket 10, and rubber ring 11 increases the frictional force after the locking in the protection gasket 10, make the difficult emergence of screw become flexible, fastening effect is more stable simultaneously.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (6)

1. The utility model provides a self tapping screw with two-way expanded structure, includes spiral shell head (1) and interior thread cylinder (4), its characterized in that: the bottom fixedly connected with self tapping screw rod (2) of spiral shell head (1), the bottom fixedly connected with inflation section of thick bamboo (7) of an internal thread section of thick bamboo (4), box (9) are hidden to the top fixedly connected with of an internal thread section of thick bamboo (4), hide one side fixedly connected with hinge (14) of box (9), the activity is articulated on hinge (14) to have flip (3), the one end fixedly connected with joint piece (12) of flip (3) one side, joint groove (13) have been seted up to the one end of hiding box (9) one side.

2. A self-tapping screw having a bi-directional expansion structure as set forth in claim 1, wherein: the clamping blocks (12) correspond to the clamping grooves (13), and clamping structures are formed between the clamping blocks (12) and the clamping grooves (13).

3. A self-tapping screw having a bidirectional expansion structure as set forth in claim 1, wherein: the self-tapping screw (2) penetrates through the inner part of the internal thread cylinder (4), and the external threads of the self-tapping screw (2) are matched with the internal threads of the internal thread cylinder (4).

4. A self-tapping screw having a bidirectional expansion structure as set forth in claim 1, wherein: openings (6) are respectively formed in two ends of the expansion cylinder (7), and anti-skidding tooth blocks (5) are respectively and uniformly arranged on two sides of the expansion cylinder (7).

5. A self-tapping screw having a bidirectional expansion structure as set forth in claim 1, wherein: the outside fixedly connected with location strip (8) of an internal thread section of thick bamboo (4), location strip (8) are provided with four groups at the outside of an internal thread section of thick bamboo (4) equidistant.

6. A self-tapping screw having a bi-directional expansion structure as set forth in claim 1, wherein: the bottom end of the screw head (1) is fixedly connected with a gasket (10), and a rubber ring (11) is fixedly bonded at the edge position of the bottom end of the gasket (10).

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