CN214998684U

CN214998684U - External thread type expansion screw

Info

Publication number: CN214998684U
Application number: CN202023056647.6U
Authority: CN
Inventors: 李奇
Original assignee: Yuqi Industrial Co ltd
Current assignee: Yuqi Industrial Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-12-03
Anticipated expiration: 2030-12-17

Abstract

The utility model provides an outer tooth formula inflation screw, outer tooth formula inflation screw contain the metal and take out outer pole of line, compel spare and rotating member, and the metal is taken out the line outer pole and is taken out the line, processes such as punching press (cold forging), one-tenth tooth and drilling and make by wire rod, is different from the sleeve pipe that general inflation screw made with panel, can provide the fixed and effect of shearing of outer tooth formula inflation screw preferred, makes the utility model discloses outer tooth formula inflation screw has sturdy and durable and repeatedly usable's characteristic.

Description

External thread type expansion screw

Technical Field

The present invention relates to an expansion screw, and more particularly to an expansion screw made of metal.

Background

The expansion screw is also called gecko and is a common workpiece which is placed in a hole and achieves the fixing effect by utilizing the tightening effect.

The expansion screw for fixing heavy object is usually made of metal material, and most of the sleeves of said expansion screw are made of metal tube, said metal tube is made up by using metal plate material and adopting the process of coiling and welding, and the external wall of the sleeve can be equipped with several cracks or expansion grooves, so that the expansion component can push or press the section of expansion groove at the tail end of the sleeve, and can be deformed, and tightly pressed in the hole.

Most expansion screws can only be used once as the sleeve deforms when being pressed against the hole; secondly, it is also often the case that the expansion element is rotated idle relative to the sleeve when the expansion element is operated, so that the sleeve cannot expand. The sleeve may be sunk into the wall surface or stuck in the hole during the construction process, and when the sleeve is drawn out during the construction process or removed in the future, the sleeve may not be taken out or the wall surface may be damaged to affect the appearance, and the sleeve may be deformed and not reused when the sleeve is removed by the pliers.

SUMMERY OF THE UTILITY MODEL

The main purpose of the utility model is to design an external tooth type expansion screw which has a strong structure, is convenient to operate and can be repeatedly used.

To achieve the above object, the external thread type expansion screw of the present invention comprises a metal material, and comprises: the front end of the metal external rod is formed into a screw head through cold forging, the outer surface of the metal external rod is provided with an external thread, the center of the metal external rod is provided with a through hole, and the tail end of the metal external rod is provided with at least two expansion grooves, so that when the tail end of the metal external rod is subjected to external thrust from inside to outside, the tail end of the metal external rod is propped open to present an expansion effect.

In practice, the external thread type expansion screw further comprises: a packing piece made of metal material and having a cone-shaped part located at the end of the metal wire-drawing outer rod; the small diameter end of the conical part faces the through hole and the outer diameter of the conical part is smaller than that of the through hole, the outer diameter of the large diameter end of the conical part is larger than that of the through hole, a convex part protruding in the radial direction is arranged on the outer peripheral surface of the conical part, and the convex part is arranged in one of the two expansion grooves so that the clamping piece cannot rotate relative to the metal wire drawing outer rod; and the rotating part is made of metal materials, is provided with a rotating part exposed out of the front end of the metal wire drawing outer rod and is in threaded connection with the packing piece.

During the implementation, the rotating member presents the molding of nut, and the packing piece is almost the bolt molding and contains an interior pole of connecting in the taper portion, and interior pole is worn to establish in the through-hole, and interior pole threaded connection is in rotating member.

During implementation, the rotating part presents the molding of bolt and contains the interior pole of a connection rotating part, and interior pole is worn to establish in the through-hole, and interior pole threaded connection is in forcing spare.

In practice, the convex part is formed by pressing the surface of the packing piece.

When the screw is implemented, the outer peripheral surface of the screw head is in a hexagonal column shape.

In practice, a lug is arranged between the screw head and the external screw thread.

When the metal wire drawing outer rod is implemented, the outer surface of the metal wire drawing outer rod is provided with a toothless area, and the toothless area is positioned between the convex part and the outer thread.

In practice, the difference between the diameter of the through hole and the diameter of the outer thread is at least 1.2 mm.

In practice, the ratio of the bottom diameter of the through hole to the thread pitch of the external thread is more than or equal to 1.8 and less than or equal to 2.

In practice, the outer peripheral surface of the tapered portion is provided with a slip-stopping portion.

When the anti-slip part is applied, the anti-slip part protrudes out of the peripheral surface.

When the anti-slip part is used, the anti-slip part is sunk on the peripheral surface.

Compare in general inflation screw, the utility model discloses outer tooth formula inflation screw can utilize screw head rotating metal to take out line outer pole, makes outer tooth tap the cement hole of predetermineeing on the wall, before still not operating rotating member displacement compels the piece, can make the metal take out line outer pole and the cement hole on the wall produce preliminary location effect in advance. On the contrary, the metal drawing line outer rod can be quickly screwed out of the cement hole on the wall surface by rotating the screw head, so that the metal drawing line outer rod can be repeatedly reused. And the outer pole of metal drawing line is taken out the line by wire rod, punching press, becomes processes such as tooth and drilling and make and structure as an organic whole, and non-deformable, effect of shearing are good, and this structure is different from the outer pole of metal drawing line that general sheet metal welding was made, makes the utility model discloses outer tooth formula inflation screw has that the structure is strong and the operation of being convenient for, repeatedly usable's characteristic again.

Drawings

Fig. 1 is a perspective view of a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of the first embodiment of the present invention.

Fig. 3 is a sectional view of the first embodiment of the present invention.

Fig. 4 is a schematic view of the first embodiment of the present invention in an unexpanded state.

Fig. 5 is a schematic view of the first embodiment of the present invention in an expanded state.

Fig. 6 is a schematic view showing a part of the end of the metal drawing outer rod according to the first embodiment of the present invention.

Fig. 7 is a schematic view (a) of the shape of the anti-slip part according to the first embodiment of the present invention.

Fig. 8 is a schematic view (ii) of the shape of the anti-slip part according to the first embodiment of the present invention.

Fig. 9 is a schematic view (iii) of the shape of the anti-slip part according to the first embodiment of the present invention.

Fig. 10 is a schematic view (iv) of the shape of the anti-slip part according to the first embodiment of the present invention.

Fig. 11 is an exploded perspective view of a second embodiment of the present invention.

Fig. 12 is a sectional view of a second embodiment of the present invention.

Fig. 13 is a schematic view of a method for manufacturing a metal wire-drawing outer rod according to various embodiments of the present invention.

Description of reference numerals: 100-external thread type expansion screw; 10-metal drawing outer rod; 11-a screw head; 12-external screw thread; 13-a through hole; 14-expansion groove; 15-a tab portion; 16-edentulous area; 20-a packing member; 21-a tapered portion; 211-a slip stop; 30-a rotating member; 31-a rotating part; 40-inner rod; 200-to-be-fixed objects; 300-wall surface; 301-cement holes; w1-bottom diameter; w2-pore size; p-pitch; s1-drawing the wire; s2-stamping; s3-a tooth forming step; s4-drilling; s5-grooving step.

Detailed Description

Referring to fig. 1 to 3, the external thread type expansion screw 100 of this embodiment includes a metal wire drawing outer rod 10, a rotating member 30 and a tightening member 20.

The metal external rod 10 for drawing the wire is formed by drawing the wire from a metal wire rod, the front end of the metal external rod 10 for drawing the wire is formed into a screw head 11 through cold forging, the outer circumference of the screw head 11 is in the shape of a hexagonal column, the outer surface of the metal external rod 10 for drawing the wire is provided with an external thread 12 formed by forming the thread, the center of the metal external rod 10 for drawing the wire is provided with a through hole 13 formed by axial drilling, the tail end of the metal external rod 10 for drawing the wire is provided with two symmetrically arranged expansion grooves 14, a lug part 15 is arranged between the screw head 11 and the external thread 12, and a non-tooth area 16 is arranged between the lug part 15 and the external thread 12.

The packing 20 is made of metal material, the packing 20 is substantially in a bolt shape, and includes a taper portion 21 located at the end of the metal outside rod 10 and an inner rod 40 connected to the taper portion 21, the taper portion 21 and the inner rod 40 are integrally formed.

The small diameter end of the conical portion 21 faces the through hole 13 and has an outer diameter smaller than that of the through hole 13, the large diameter end of the conical portion 21 has an outer diameter larger than that of the through hole 13, the inner rod 40 is inserted into the through hole 13, and the inner rod 40 is screwed to the rotary member 30.

The rotating member 30 is made of metal material, is screwed to the tightening member 20, and has a rotating portion 31 exposed out of the front end of the metal wire drawing rod 10, the rotating member 30 is in the shape of a nut, and the outer peripheral surface of the rotating member forms the rotating portion 31 and has a hexagonal column shape.

Referring to fig. 4, the external thread type expansion screw 100 is first threaded through the toothless region 16 to fix the object 200, and then the tab portion 15 is used to fasten the exterior of the object 200, and the end of the metal wire drawing rod 10 is threaded into the cement hole 301 of the wall surface 300. When the cement hole 301 is slightly smaller than the external thread 12, the metal threaded outer rod 10 can be screwed into the cement hole 301 by screwing the screw head 11, or conversely, the metal threaded outer rod 10 can be screwed out of the cement hole 301 by screwing the screw head 11 reversely.

Referring to fig. 5, the corner position where the expansion groove 14 contacts the tapered portion 21 can provide a friction force for suppressing or reducing the rotation of the tapered portion 21, and even can be engaged with the surface of the tapered portion 21, at this time, the rotating member 30 can be controlled to rotate to axially displace the tightening member 20 relative to the metal wire-drawing outer rod 10, when the tightening member 20 is displaced into the through hole 13, the end of the metal wire-drawing outer rod 10 is pushed by the tapered portion 21 to expand outward, so as to provide a radial pressing force to the cement hole 301, so that the external thread type expansion screw 100 can be stably positioned on the wall 300, and the object 200 can be fixed.

Referring to fig. 6, the ratio of the bottom diameter W1 of the outer thread 12 to the pitch P of the outer thread 12 is preferably greater than or equal to 1.8 and less than or equal to 2, so that the outer thread 12 has a considerable tapping effect, so that the outer thread 12 can be screwed into or out of the cement hole 301 (see fig. 4 or 5) provided in the wall surface 300. The difference between the aperture W2 of the through hole 13 and the bottom diameter W1 of the metal drawn wire outer rod 10 is at least 1.2mm, so that the metal drawn wire outer rod 10 has better structural strength and shearing resistance.

Referring to fig. 7 and 8, in order to suppress or reduce the idle rotation of the tapered portion 21, a slip-preventing portion 211 may be further provided on the outer circumferential surface of the tapered portion 21, and the slip-preventing portion 211 may be recessed in the outer circumferential surface of the tapered portion 21. The anti-slip portion 211 shown in fig. 7 is provided on the outer circumferential surface of the tapered portion 21 in a shape of a groove, and the anti-slip portion 211 shown in fig. 8 is provided on the outer circumferential surface of the tapered portion 21 in a shape of an embossing.

Referring to fig. 9 and 10, the anti-slip portion 211 may protrude from the outer circumferential surface of the tapered portion 21. The anti-slip portion 211 shown in fig. 9 is provided on the outer circumferential surface of the tapered portion 21 in a convex rib shape, and the anti-slip portion 211 shown in fig. 10 is provided on the outer circumferential surface of the tapered portion 21 in a convex rib shape.

Referring to fig. 11 and twelfth, the main difference between the threaded expansion screw 100 of the present embodiment and the first embodiment is that the rotating member 30 is generally in the shape of a bolt, and the tightening member 20 is generally in the shape of a tapered nut; the rotating member 30 comprises a rotating part 31 and an inner rod 40, the inner rod 30 is inserted into the through hole 13, and the rotating part 31 and the inner rod 40 are integrally formed; the packing 20 is in the form of a tapered nut for the threaded connection of the inner rod 40.

Referring to fig. 2 and 13, the metal wire-drawing outer rod 10 of the above embodiments can be manufactured by the following steps, so that the metal wire-drawing outer rod 10 is in an integral forged structure, has better toughness and shear strength, can be driven into the wall hole to produce good engagement, and can be screwed out of the wall hole for reuse:

a drawing step S1, drawing the metal wire to form a rod-shaped model;

a pressing step S2, pressing the front end of the rod-shaped molded body to form the cold-forged screw head 11 and also to form the protruding portion 15 simultaneously;

a teeth forming step S3, performing teeth forming processing on the rod-shaped model surface within a preset section range to form the outer screw teeth 12, wherein the tooth-free area 16 is positioned outside the section range;

a drilling step S4 of drilling the center of the rod-shaped molded body axially to form a through hole 13; and

a grooving step S5 is performed to groove the end of the rod-shaped molding end to form at least two expansion grooves 14, so as to obtain a finished product of the metal drawn wire outer rod 10.

The completed metal-drawn outer rod 10 is manufactured through the processes of drawing a wire, stamping, forming teeth, drilling, etc. to form an integrated cold forging structure, which provides the outer-tooth type expansion screw 100 having a strong structure, convenient operation, and reusability.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An external expansion screw, comprising:

the front end of the metal external drawing wire rod is formed with a screw head through cold forging, the outer surface of the metal external drawing wire rod is provided with an external thread, the center of the metal external drawing wire rod is provided with a through hole, and the tail end of the metal external drawing wire rod is provided with at least two expansion grooves, so that when the tail end of the metal external drawing wire rod is pushed from inside to outside, the tail end of the metal external drawing wire rod can be propped open to present an expansion effect;

a packing piece made of metal material and having a cone-shaped part located at the end of the metal wire-drawing outer rod; the small diameter end of the conical part faces the through hole, the outer diameter of the small diameter end of the conical part is smaller than that of the through hole, and the outer diameter of the large diameter end of the conical part is larger than that of the through hole; and

the rotating part is made of metal materials and provided with a rotating part exposed out of the front end of the metal wire drawing outer rod, the rotating part is in threaded connection with the packing part, the rotating part is in a nut shape, the packing part is in a bolt shape and comprises an inner rod connected to the conical part, the inner rod penetrates through the through hole, and the inner rod is in threaded connection with the rotating part.

2. The male-type expansion screw according to claim 1, wherein a slip stopper is provided on an outer circumferential surface of the tapered portion.

3. The male expansion screw of claim 2, wherein the anti-slip portion protrudes from the outer circumferential surface.

4. The male expansion screw according to claim 2, wherein the anti-slip portion is recessed in the outer circumferential surface.

5. The externally threaded expansion screw of claim 1, wherein the outer circumference of the screw head is in the shape of a hexagonal cylinder.

6. The externally threaded expansion screw of claim 1 wherein a tab portion is disposed between the head and the external thread.

7. The externally threaded expansion screw of claim 6 wherein the outer surface of the metal wire-drawing outer shank has a non-threaded region between the tab portion and the external thread.

8. The external thread type expansion screw of claim 1, wherein the difference between the diameter of the through hole and the diameter of the external thread is at least 1.2 mm.

9. The external thread type expansion screw of claim 1, wherein the ratio of the bottom diameter of the through hole to the pitch of the external thread is greater than or equal to 1.8 and less than or equal to 2.