CN202017286U

CN202017286U - Back bolt

Info

Publication number: CN202017286U
Application number: CN2011201015059U
Authority: CN
Inventors: 李忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-06
Filing date: 2011-04-06
Publication date: 2011-10-26
Anticipated expiration: 2021-04-06

Abstract

The utility model relates to a back bolt, which is used for fastening a building external facing stone curtain wall, and comprises a screw rod, and an expansion ring, a gasket, a screw nut and an extruding steel sleeve which are matched and connected with the screw rod, wherein the extruding steel sleeve is provided with an axial cut opening. The back bolt is characterized in that the lower part of the extruding steel sleeve is a cone frustum body, the upper part and the middle part are cylinder bodies, and in addition, a plurality of axial grooves are arranged at the outer side of the extruding steel sleeve. The screw rod expansion end and the installing hole bottom section are matched and fixedly connected, and the outer sides of the cylinder bodies of the extruding steel sleeve are also fixedly connected with the installing hole cylinder sections matched in the application. During the application, the anti-pulling force is improved, and the stability is enhanced.

Description

Back of the body bolt

Technical field

The utility model relates to a kind of building outside finish stone curtain wall securing member, particularly a kind of percussive back of the body bolt.

Background technology

At present, the percussive back of the body bolt of widespread usage is made up of screw rod, expansion loop, extruding steel bushing, pad and nut usually in the construction of building outside finish stone curtain wall.During application, be enclosed within expansion loop and extruding steel bushing on the screw rod successively, expansion loop can be wedge shape by distending on the expanding end of screw rod, then the expansion loop of the expanding end of screw rod and socket and extruding steel bushing are inserted in default installing hole stone material backboard face, that form by cylindrical section and trapezoidal bottom section two parts, relend and help outer sleeve and hammer to knock, utilize screw expansion end wedge shape inclined-plane that expansion loop is strutted, the screw expansion end is fixed in the installing hole bottom of cooperation, and the side have the cylindrical extruding steel bushing of an axial groove and place the bigger cylindrical hole in aperture.Like this, described screw rod outside is installed pad and nut again, just can be fixed on the stone material backboard face.

In the above-mentioned percussive back of the body bolt, because the axial dimension of expansion loop is generally less, the contact surface of expansion loop and trapezoidal sector hole is also corresponding less, therefore the tension pull out force is restricted, and the axial dimension of extruding steel bushing is generally big than expansion loop, but cylindrical extruding steel bushing external diameter is usually less than the installing hole cylindrical section aperture on the stone material backboard face, be formed with certain interval between itself and the installing hole, when being subjected to radial load, the screw rod outer end portion does the time spent, fixing screw expansion end is also just impacted, and the stability when back of the body bolt is used is just simultaneously influenced.

Summary of the invention

The utility model provides a kind of new back of the body bolt, and the raising of tension pull out force, stability strengthened when it was used.

Back of the body bolt described in the utility model, comprise a screw rod, expansion loop, pad, nut and the tape spool that is connected with this screw rod is to the extruding steel bushing of groove, and it is characterized in that: described extruding steel bushing bottom is the circular cone stage body, top and middle part are cylinder, and the outside of extruding steel bushing is provided with some axial notches.

Useful technique effect of the present utility model is: it except screw expansion end and expansion loop cooperate with section at the bottom of the installing hole affixed, its extruding steel bushing cylinder outside also with use in the installing hole cylindrical section that cooperates be fixedly connected.Like this, the contact surface that the utility model and installing hole are fixedly connected increases greatly, and its tension pull out force raising, stability strengthen during application.

Description of drawings

Fig. 1 is present technology back of the body stud structure schematic diagram.

Fig. 2 is a structural representation of the present utility model.

The specific embodiment

Accompanying drawing marking explanation: 1-screw rod, 2-nut, 3-pad, 4-extruding steel bushing, 5-expansion loop, 6-screw expansion end, the axial groove of 41-, 42-axial notch, 51-expansion loop breach.

As shown in Figure 2, back of the body bolt described in the utility model, comprise a screw rod 1, expansion loop 5, pad 3, nut 2 and the tape spool that is connected with this screw rod 1 is to the extruding steel bushing 4 of groove 41, described extruding steel bushing 4 bottoms are the circular cone stage body, top and middle part are cylinder, and the outside of extruding steel bushing 4 is provided with some axial notches 42.

When the utility model was used, the cylindrical external diameter of extruding steel bushing was greater than and cooperates the cylinder aperture of installing on the stone material backboard face.The circular cone stage body of described extruding steel bushing 4 bottoms, it is convenient and easily to make when peg graft installing hole, make orifice end is installed can be not undermined.Some axial notches 42 that the outside of extruding steel bushing 4 is provided with, it is easier to insert it into installing hole, and can strengthen the steel bushing rotational resistance.

Use when installing, be enclosed within expansion loop in the utility model and extruding steel bushing on the screw rod successively, the expansion loop openend cooperates with the expanding end of screw rod and joins, then the expansion loop of the expanding end of screw rod and socket and extruding steel bushing are inserted stone material backboard face, in the default installing hole of forming by cylindrical section and trapezoidal bottom section two parts, wherein push the circular cone stage body termination expansion loop top of steel bushing, relend and help outer sleeve and hammer to knock, utilize screw expansion end wedge shape inclined-plane that expansion loop is strutted, make the screw expansion end be fixed in the installing hole bottom of cooperation, and the side have the cylindrical extruding steel bushing of an axial groove and place the bigger cylindrical hole in aperture.

Therefore, when the utility model is used except screw expansion end 6 cooperates with section trapezoidal hole at the bottom of the installing hole affixed, outside the cylinder of its extruding steel bushing 4 also with application in the installing hole cylindrical section that cooperates fixedly connected.Like this, the contact surface that the utility model and installing hole are fixedly connected increases greatly, and its tension pull out force raising, stability strengthen during application.

What should be understood that is: the foregoing description is just to explanation of the present utility model, and any innovation and creation that do not exceed in the utility model connotation scope all fall within the protection domain of the present utility model.

Claims

1. carry on the back bolt for one kind, comprise a screw rod, expansion loop, pad, nut and the tape spool that is connected with this screw rod is to the extruding steel bushing of groove, and it is characterized in that: described extruding steel bushing bottom is the circular cone stage body, top and middle part are cylinder, and the outside of extruding steel bushing is provided with some axial notches.