CN2505636Y

CN2505636Y - Turning-proof expansion bolt

Info

Publication number: CN2505636Y
Application number: CN 01261879
Authority: CN
Inventors: 李军强
Original assignee: 杨翠红
Priority date: 2001-09-26
Filing date: 2001-09-26
Publication date: 2002-08-14
Anticipated expiration: 2011-09-26

Abstract

A turning-proof expansion bolt belongs to the connecting standard part technical field, which is used to solve the problem that expansion pipe and expansion screw rod rotate along with nut and affect locking when the common expansion bolt is inserted into expanded holes to tighten nut. The utility model comprises an expansion pipe, an expansion screw rod and a locking nut, which is improved in that: a plurality of barbs are arranged on the outer pipe wall of the expansion pipe; the thorn points of the barbs is opposite to the direction of the locking nut; drop pits are arranged on the outer surface of the expanded part of the expansion pipe; a vertical convex rib is arranged on the outer circumferential surface of an expansion circular table of the expansion screw rod; the thickness of the expanded part of the expansion pipe is big. With the structure, the barbs on the pipe wall of the expansion pipe and the drop pits greatly increase the friction with the hole wall of an expanded hole so as to make the expansion pipe incapable of rotating along the pipe wall in locking process; the convex rib on the circular table surface of the expansion screw rod can make the screw rod incapable of rotating along with the locking nut in locking process; and the thickened expanded part is difficult to be damaged.

Description

A kind of rotation inhibiting EXPANSION ANCHOR BOLTS

Technical field

The utility model relates to a kind of EXPANSION ANCHOR BOLTS, belongs to connecting the standard piece technical field.

Background technique

EXPANSION ANCHOR BOLTS is a kind of metal standard piece, and it is widely used on the objects such as body of wall, cement components installs various mechanical devices or electric component, have easy to manufacture, low price, easy construction, advantage such as be connected firmly.But find that in application after EXPANSION ANCHOR BOLTS insert to expand the hole, when tightening locking nut, expansion tube regular meeting was along with rotation, so that influence the expansion tube locking of expanding that this situation is easier generation when big slightly in bloated hole.In addition, the expansion tube tube wall is thinner, and its distending part is damaged when expanding rotation easily, also is one of shortcoming.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of EXPANSION ANCHOR BOLTS that expansion tube can not rotate thereupon when inserting bloated hole, locking nut.

The alleged technical problem of the utility model is realized by following technological scheme:

A kind of rotation inhibiting EXPANSION ANCHOR BOLTS, it comprises expansion tube, and expansive screw, locking nut, its improvements be, is provided with hangnail on the outer tube wall of expansion tube, and the thorn cutting edge of a knife or a sword of hangnail is facing to the direction of locking nut.

Above-mentioned rotation inhibiting EXPANSION ANCHOR BOLTS is covered with pit on the outer surface of the distending part of described expansion tube.

Above-mentioned rotation inhibiting EXPANSION ANCHOR BOLTS, the outer peripheral surface of the expansion round platform of described expansive screw is provided with vertical convex tendon.

Above-mentioned rotation inhibiting EXPANSION ANCHOR BOLTS, the distending segment thickness of described expansion tube is greater than other parts.

Adopt the rotation inhibiting EXPANSION ANCHOR BOLTS of this structure, after expansion tube inserts the hole of expanding, the hangnail of expansion tube tube wall and pit have increased the frictional force with bloated hole hole wall greatly, expansion tube is rotated along tube wall tightening Shi Buhui, the convex tendon on expansive screw round platform surface can make screw rod also can not rotate with locking nut when tightening, and the part of opening of thickening also is not easy to damage.

Description of drawings

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

Fig. 2 is the plan view of Fig. 1;

Fig. 3 is the A-A sectional view of Fig. 1.

Embodiment

As seen from the figure, the utility model is to improve on the basis of general EXPANSION ANCHOR BOLTS.At first, have hangnail 4 at 1/3 place of the tube wall of expansion tube 1, hangnail 4 can be provided with 2-4 along the tube wall circumference uniform distribution, is preferably even number, and present embodiment adopts 2.The thorn cutting edge of a knife or a sword of hangnail 4 is towards the direction of locking nut 3.While is covered with pit 6 on the outer surface of the distending part 5 of EXPANSION ANCHOR BOLTS expansion tube 1.After EXPANSION ANCHOR BOLTS insert to expand the hole, the tube wall that these hangnails 4 and pit 6 can make expansion tube 1 produced very big frictional force with the hole wall in bloated hole, and expansion tube 1 can not rotate in the hole of expanding and be mobile backward, and when being convenient to locking nut 3 and tightening, expansion tube 1 swelling is fixed.Secondly, the expansion round platform 7 upper edge circumference of the below of expansive screw 2 are provided with several vertical convex tendons 8, and present embodiment is established 2, and its effect is that expansive screw 2 can not rotated when locking nut 3 rotates thereupon, is convenient to tighten locking nut 3.Have, the distending part 5 of expansion tube 1 below is thickeied again, and is not fragile when inserting and opening like this.

Be the expansion tube diameter of EXPANSION ANCHOR BOLTS of different-diameter and the recommendation thickness (mm of unit) of thickened portion below. expansion bolt diameter expansion pipe diameter reinforcement thickness φ 8 12 3.5 φ 10 14 4 φ 12 16 4.5 φ 14 18 4.5 φ 16 20 5 φ 18 22 6 φ 20 24 6 φ 22 26 7

Claims

1. rotation inhibiting EXPANSION ANCHOR BOLTS, it comprises expansion tube [1], expansive screw [2], locking nut [3], it is characterized in that: be provided with hangnail [4] on the outer tube wall of described expansion tube [1], the thorn cutting edge of a knife or a sword of hangnail [4] is facing to the direction of locking nut [3].

2. rotation inhibiting EXPANSION ANCHOR BOLTS according to claim 1 is characterized in that: be covered with pit [6] on the outer surface of the distending part [5] of described expansion tube [1].

3. rotation inhibiting EXPANSION ANCHOR BOLTS according to claim 2 is characterized in that: the outer peripheral surface of the expansion round platform [7] of described expansive screw [2] is provided with vertical convex tendon [8].

4. rotation inhibiting EXPANSION ANCHOR BOLTS according to claim 3 is characterized in that: distending part [5] thickness of described expansion tube [1] is greater than other parts.