CN201050528Y

CN201050528Y - Expansion bolt

Info

Publication number: CN201050528Y
Application number: CNU2007200518459U
Authority: CN
Inventors: 陈伟明
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-21
Filing date: 2007-05-21
Publication date: 2008-04-23
Anticipated expiration: 2017-05-21

Abstract

The utility model provides an expansion bolt, which includes a tubular expansion sleeve and a screw matching with the expansion sleeve. The upside of the screw is provided with a screw cap integrated. The diameter of the upside of the screw is larger than the diameter of the lower side of the screw, and is less than or equal to the diameter of the expansion sleeve, thereby a step structure is formed into a frustum of cone for transition, and outer screw thread is arranged on the surface of the screw. The inner screw thread matching with the outer screw thread is arranged on the inner wall of the expansion sleeve, one or more gaps through the expansion sleeve are cut from one end of the expansion sleeve along the axis direction to form a plurality of expanding tongue structures of which upper half parts are separated, and the root parts are connected. After being unfolded, the expansion tongues fill the redundant gaps in the wall body and form agnail structures, and the utility model is enabled to bear heavier objects with uneasy breaking-off. The utility model provides an expansion bolt with the advantages of strong fastening performance, easy detachment, simply structure and easy process.

Description

A kind of EXPANSION ANCHOR BOLTS

Technical field

The utility model relates to and a kind ofly is used for fastening or the fixing expansion gear of usefulness, particularly a kind of EXPANSION ANCHOR BOLTS.

Background technique

EXPANSION ANCHOR BOLTS is a kind of weights such as air-conditioning, electric fan, curtain frame to be fixed on a kind of haberdashery and hardware on the body of wall.At present, by the EXPANSION ANCHOR BOLTS of bolt and outer sleeve two-piece type, utilize the expansion tongue blind of outer sleeve to reach fixed effect, the EXPANSION ANCHOR BOLTS load-bearing effect of this mode is relatively poor.During dismounting, bolt can not removal, causes an end of bolt to expose at surface of wall, influences also to hinder the repairing body of wall time attractive in appearance.

The model utility content

The utility model provides and a kind ofly utilizes the expansion tongue to open the structure that the back forms the likeness in form hangnail blind time to fix EXPANSION ANCHOR BOLTS, reaches that tightness is stronger, the easy-off EXPANSION ANCHOR BOLTS.

Problem according to above-mentioned required solution has designed a kind of EXPANSION ANCHOR BOLTS, comprise the expansion sleeve of tubulose and the screw rod that matches with expansion sleeve, being provided with nut in the screw rod upper end fuses in it, the diameter of screw rod upper end is greater than the diameter of screw rod lower end, and the diameter that is less than or equal to expansion sleeve, forming a step-like structure, is the taper type transition between screw rod upper end and the screw rod lower end.On whole surface of screw rod or part, be provided with outside thread.On the inwall of expansion sleeve, be provided with the internal thread that is complementary with outside thread, prolong at the one end and axially have one or more joint-cutting that runs through expansion sleeve, form a plurality of upper half part and separate, the expansion tongue structure that root links to each other.

The length of the joint-cutting on the expansion sleeve is less than or equal to the length of screw rod lower end, and this slot length equals 1/3rd to 4/5ths height of expansion sleeve.The opening direction of the expansion tongue after stressed the opening is subjected to force direction identical with the load-bearing of EXPANSION ANCHOR BOLTS, forms the structure of similar hangnail.Adding man-hour, the frictional force for a nearly step enhancing EXPANSION ANCHOR BOLTS and wall is provided with a plurality of frictional grooves or flakey projection at the expansion sleeve outer wall.

In order to be applicable to existing setting tool, screw rod of the present utility model can be made the structure of approximate hex head bolt or countersunk screw, more convenient in the use.

After the utility model was installed, the expansion tongue of expansion sleeve forms likeness in form hangnail when opening slit unnecessary in the filled wall of back structure made the utility model can bear heavier article and difficult drop-off.Dismounting is during the utility model, only needs to get final product with common screwdriver set or the spanner screw rod of just easily back-outing, and the part accessory can not occur and be exposed to surface of wall, and it is attractive in appearance not influence body of wall.The utility model be have simultaneously that tightness is strong, dismounting easily, simple in structure, a kind of fixing device of being easy to machining characteristics.

Description of drawings

Fig. 1 is a screw-rod structure schematic representation of the present utility model;

Fig. 2 is embodiment's one screw rod perspective view of the present utility model;

Fig. 3 is embodiment's two screw rod perspective view of the present utility model;

Fig. 4 is an expansion sleeve complete section structural representation of the present utility model;

Fig. 5 is the utility model embodiment one an expansion sleeve structural representation;

Fig. 6 is the utility model embodiment two an expansion sleeve structural representation;

Fig. 7 is the structural representation of the utility model in user mode.

Embodiment

With reference to the accompanying drawings model utility is described in further detail below, the main structure of screw rod 1 shown in Figure 1 comprises that screw rod lower end 3, screw rod upper end 2 and nut 4 are in turn connected into one, and the main structure of expansion sleeve shown in Figure 4 comprises expansion tongue 8 and internal thread 9.

Fig. 1, the 2nd, the basic embodiment of the utility model screw rod, 2 diameter is greater than the diameter of screw rod lower end 3 on screw rod, and the diameter that is less than or equal to expansion sleeve 6, form a step-like structure, be the taper type transition between screw rod upper end and the screw rod lower end, be provided with outside thread 5 on the surface of screw rod 1.In order to match, this screw rod 1 is made approximate hex head bolt shape with existing spanner.

Fig. 4, the 5th, a kind of basic embodiment of the utility model expansion sleeve, as shown in Figure 4, expansion sleeve 6 inwalls are provided with the internal thread 9 that is complementary with outside thread 5, prolong at the one end and axially to have four joint-cuttings 7 that run through outer wall from expansion sleeve 6 inwalls, as shown in Figure 5, form upper half part independence and continuous expansion tongue 8 structures of root.Install for convenience and use, the length of this joint-cutting 7 should be less than or equal to the length of screw rod lower end 3, the length of joint-cutting equal expansion sleeve high 1/3rd.In order further to increase the frictional force on this EXPANSION ANCHOR BOLTS surface, expansion sleeve 6 rotates with screw rod 1 when avoiding installing, and is adding man-hour, processes a plurality of frictional grooves 10 (processing as adopting roller flower mode) on expansion sleeve 6 outer walls equably.

Fig. 3 is the another kind of mode of execution of the utility model tightening latch 2, and is basic identical with the structure of tightening latch 2 shown in Figure 2, and difference is and is located at the global shape of tightening latch like countersunk screw.Can cooperate existing screwdriver set to carry out blackout.

Fig. 6 is another mode of execution of the utility model expansion sleeve 6, and is basic identical with expansion sleeve 6 structures shown in Figure 5, and difference is that expansion sleeve 6 outer walls process a plurality of flakey projections 11 equably.Protruding 11 of flakey can combine with wall better, increases heavy burden ability of the present utility model.

As shown in Figure 7, when the utility model is installed, on body of wall 12, leave the mounting hole 13 of a slightly larger in diameter earlier, expansion sleeve 6 is placed mounting hole 13, be provided with expansion tongue 8 one ends towards mounting hole 13 opening directions in expansion sleeve 6 diameters.Turn screw rod 1 then, the screw rod that constantly advances is constantly pushed the expansion tongue 8 on the expansion sleeve 6, makes expansion tongue 8 outwards open; Open expansion tongue 8 fill in the mounting holes 13 more than the space, make this EXPANSION ANCHOR BOLTS and mounting hole tightness combine, expand simultaneously tongue 8 opening direction and EXPANSION ANCHOR BOLTS be subjected to force direction identical, in the hole, form the structure of likeness in form hangnail, this expansion of structure bolton is stronger.Only need back out screw rod 1 during dismounting and get final product, and the situation that EXPANSION ANCHOR BOLTS partly is exposed to surface of wall and is difficult to dismantle can not occur.Do not influence the attractive in appearance of body of wall after the dismounting of the EXPANSION ANCHOR BOLTS of design like this, and make things convenient for the repairing of body of wall.

Claims

1. EXPANSION ANCHOR BOLTS, comprise the expansion sleeve (6) of tubulose and the screw rod (1) supporting with it, screw rod upper end (2) is provided with nut (4) and fuses with it, the diameter of screw rod upper end that it is characterized in that bolt is greater than the diameter of screw rod lower end (3), between screw rod upper end and the screw rod lower end is the taper type transition, and screw surface is provided with outside thread (5); The expansion sleeve inwall is provided with the internal thread (9) that is complementary with outside thread, prolongs at the one end axially to have one or more joint-cutting (7) that runs through expansion sleeve, forms upper half part tongue (8) structure that independently expands.

2. EXPANSION ANCHOR BOLTS according to claim 1 is characterized in that the length of joint-cutting is less than or equal to the length of screw rod Lower Half, the length of joint-cutting equal expansion sleeve high 1/3rd to 4/5ths.

3. EXPANSION ANCHOR BOLTS according to claim 2 is characterized in that the expansion sleeve outer wall is provided with frictional groove (10).

4. EXPANSION ANCHOR BOLTS according to claim 2 is characterized in that the expansion sleeve outer wall is provided with flakey projection (11).

5. according to claim 1 or 2 or 3 or 4 described EXPANSION ANCHOR BOLTS, it is characterized in that the common hex head bolt of outer likeness in form of screw rod.

6. according to claim 1 or 2 or 3 or 4 described EXPANSION ANCHOR BOLTS, it is characterized in that the common countersunk screw of outer likeness in form of screw rod.