CN2685628Y

CN2685628Y - Strong expansion screw bolt

Info

Publication number: CN2685628Y
Application number: CN 200420038871
Authority: CN
Inventors: 贾晓锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-03-04
Filing date: 2004-03-04
Publication date: 2005-03-16
Anticipated expiration: 2014-03-04

Abstract

The utility model relates to a strong expansion screw bolt which comprises a screw rod, a screw cap and a sleeve barrel, wherein the bottom of the screw rod is in the shape of a trumpet. The utility model is characterized in that the sleeve barrel is composed of three to four expansion pieces and elastic force rings made of steel wires; the upper part and the lower part of each expansion piece respectively have a groove; all the expansion pieces form the sleeve barrel in a surrounding way; the elastic force rings made of steel wires are respectively embedded in a ring surrounded by the grooves of the expansion pieces. The utility model mainly improves the structure of the sleeve barrel. When a hole is drilled and the screw bolt is put in the hole, the expansion pieces can be braced by screwing the hexagonal screw cap by hand. As the expansion pieces are comparatively easy to brace by the structure, the expansion pieces can be designed with the thickness of 2mm which is comparatively thick. Thus the drilled hole which is big and the hole with the drilled hole wall which is spongy can both be easily expanded. The strong expansion screw bolt has comparatively good effect to walls made of red bricks, and makes the installation of the hollow floorslab convenient because the expansion pieces are easy to expand; as the expansion amount of the expansion pieces is big and the hole wall can be expanded tightly, the traction force can be guaranteed.

Description

Strong expansion bolt

Technical field

The utility model relates to a kind of EXPANSION ANCHOR BOLTS.

Background technique

Traditional expansion bolt is that flaring screw rod, nut, sleeve, spring washer and pad are formed by the bottom, and sleeve is placed in outside the screw rod, and there are four openings its underpart, and open height has only about 1/3 of length sleeve.The shortcoming of its existence is: (1) when punching with percussion drill, if beat bigger, just can not expand well, tension strength does not reach requirement yet.(2) on common common brick wall,, almost do not install because of common brick is softer.Relatively Bao cement board, cassette ceiling all are not suitable for using EXPANSION ANCHOR BOLTS.These defectives mainly are because the unreasonable structure of sleeve causes, the one, and four openings of sleeve are opened need very big strength, and when firmly twisting nut, sleeve just might and then rotate, can not the distending sleeve; The 2nd, sleeve is thinner, and present sleeve thickness has only about 0.3mm, the bore dia that percussion drill is beaten big a bit or sleeve change several circles inside, its swell increment is just not much of that, expand probably incessantly or pulling force not enough.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of strong expansion bolt, and sleeve can be by light distending, and expansive force is big.

Strong expansion bolt of the present utility model, comprise that the bottom is flaring screw rod, nut, sleeve, it is characterized in that described sleeve is made up of 3～4 intumescent sheets and steel wire elastic ring, the upper and lower of every intumescent sheet has a groove, all intumescent sheets surround a sleeve, embed the steel wire elastic ring respectively in the circle that groove surrounded of intumescent sheet.

The utility model mainly is a structure of having improved sleeve, and sleeve is by multi-disc, and best 4 independent intumescent sheets surround, and are fixed by the steel wire elastic ring that is easy to stretch, and when having bored the hole, after bolt was put in, twisting hexagon nut with hand just can the dilating expansion sheet.Exactly because also this structure ratio is easier to the dilating expansion sheet, it is thicker that intumescent sheet can design, can reach 1.5～2mm thickness, so the hole of boring more greatly, hole wall is softer, can easily expand, particularly the common brick wall is had reasonable effect, cassette ceiling also makes things convenient for installation because of intumescent sheet expands well.Because the swell increment of intumescent sheet is big and hole wall can swelling, thereby its pulling force can be guaranteed.

Advantage of the present utility model:

Structural design is simple, and is easy to implement.The easy distending of intumescent sheet, and swell increment is big and hole wall can swelling, the tension strength height.Not only be fit to hardened member (as cement wall, cement flooring etc.), also be fit to softer member (as common brick wall, cassette ceiling etc.) and use.

Description of drawings

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

Fig. 2 is the intumescent sheet structural representation;

Fig. 3 is the structural representation of steel wire elastic ring;

Fig. 4 is the user mode reference drawing.

Among the figure: 1 screw rod, 2 nuts, 3 spring washers, 4 pads, 5 intumescent sheets, 6 steel wire elastic rings, 7 grooves, 8 members

Embodiment

As Fig. 1, the steel wire elastic ring 6 that strong expansion bolt is thick by four 2mm, have two grooves 7 outward, rough intumescent sheet 5 and two diameters are 0.2～0.3mm is formed.Groove 7 lays respectively at the upper and lower (as shown in Figure 2) of intumescent sheet.Earlier four intumescent sheets are surrounded a sleeve, in the groove 7 on two steel wire elastic rings, the 6 embedding intumescent sheets, make its one-tenth as a whole again.

Steel wire elastic ring 6 is the annular rings with certain extending amount that surrounded by steel wire, as shown in Figure 3.

Fig. 4 illustrates for the state that EXPANSION ANCHOR BOLTS is squeezed in the member, after having bored the hole on the member, bolt is put in, and firmly twists nut 2, forces sleeve to move down, because screw rod 1 bottom is tubaeform, intumescent sheet 5 is by distending, with the hole wall swelling.

Claims

1, a kind of strong expansion bolt, comprise that the bottom is flaring screw rod, nut, sleeve, it is characterized in that described sleeve is made up of 3～4 intumescent sheets and steel wire elastic ring, the upper and lower of every intumescent sheet has a groove, all intumescent sheets surround a sleeve, embed the steel wire elastic ring respectively in the circle that groove surrounded of intumescent sheet.

2, EXPANSION ANCHOR BOLTS according to claim 1 is characterized in that described sleeve is made up of 4 intumescent sheets and steel wire elastic ring.