CN2231729Y

CN2231729Y - Internal thread expansive bolt

Info

Publication number: CN2231729Y
Application number: CN 95227888
Authority: CN
Inventors: 林仙富
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-13
Filing date: 1995-12-13
Publication date: 1996-07-24
Anticipated expiration: 2005-12-13

Abstract

The utility model relates to an internal screw thread expansion screw bolt, being composed of a screw bolt and an expansion tube. The screw bolt is composed of a screw cap, a screw thread section and an expansion head. The expansion tube is composed of a screw thread section and an expansion section. A knurling or a groove is made between the expansion head of the screw bolt and the screw thread section. The screw thread section of the expansion tube matches with the screw thread section of the screw bolt. The expansion screw bolt has the advantages of simple and reasonable stricture, fewer components, low material consumption, small required installation force, convenient use and good fastening degree.

Description

The internal thread EXPANSION ANCHOR BOLTS

The utility model relates to a kind of internal thread EXPANSION ANCHOR BOLTS, belongs to the fixed component that a kind of construction and decoration industry is used.

Chinese patent 91100209 discloses a kind of EXPANSION ANCHOR BOLTS, it is by bolt, packing ring, expansion sleeve and nut are formed, and rely on the cooperation of bolts and nuts, make nut get into expansion sleeve to fix by turning bolt, the major defect of this EXPANSION ANCHOR BOLTS is: it is many to form member, the expense of taking a lot of work material, and have big gap between expansion sleeve and the bolt, influence the tautness that this member is installed; Chinese patent 91229942 discloses another kind of expansion of structure bolt, it is by bolt, packing ring, three parts of expansion tube are formed, and wherein the head of bolt has top, the head of expansion tube is the structure (diagram) that the section of jurisdiction falls to bend, processing is little convenient, and the top of bolt head rotated in expansion tube and advance with bolt in addition, is used for the crowded expansion tube of opening, its resistance is very big, and it is little convenient to install and use.

The purpose of this utility model is to overcome the deficiencies in the prior art and provides a kind of composition member few, and is rational in infrastructure, and processing is easy to use easily, the internal thread EXPANSION ANCHOR BOLTS that tautness is good.

Internal thread EXPANSION ANCHOR BOLTS of the present utility model, by bolt, expansion tube is formed, bolt is by nut, thread section, expansion-head is formed, expansion tube is made up of thread section and expansion arc, the thread section of expansion tube is shaped on the internal thread that matches with the thread section of bolt, and the expansion arc of expansion tube front end has two or many axial grooves, and expansion arc is divided into two or many outer lobes that expand by axial groove, the internal diameter of expansion tube expansion arc is less than the internal diameter of thread section, be shaped on indentation or groove between bolt expansion-head and thread section, the external diameter of bolt expansion-head is less than the external diameter of bolt thread section, greater than the internal diameter of expansion tube expansion arc.

Internal thread EXPANSION ANCHOR BOLTS of the present utility model, simple and reasonable for structure, it is few to form member, saves material, and strength required during installation is little, and is easy to use, and tautness is good.

For introducing internal thread EXPANSION ANCHOR BOLTS of the present utility model in detail, be elaborated below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of internal thread EXPANSION ANCHOR BOLTS of the present utility model.

Referring to Fig. 1, internal thread EXPANSION ANCHOR BOLTS of the present utility model, by bolt 1, expansion tube 2 two-part are formed, can be equipped with a spring washer 3 between two-part, bolt 1 wherein is by nut 11, thread section 12, expansion-head 13 is formed, expansion tube 2 is made up of thread section 21 and expansion arc 22, the thread section 21 of expansion tube 2 is shaped on the internal thread that matches with the thread section 12 of bolt 1, the expansion arc 22 of expansion tube 2 front ends has two or many axial grooves 23, and expansion arc 22 is divided into two or many outer lobes that expand by axial groove 23, and the internal diameter of the expansion arc 22 of expansion tube 2 is less than the internal diameter of thread section 21,12 of the expansion-head 13 of bolt 1 and thread sections are shaped on indentation or groove 14, the external diameter of the expansion-head 13 of bolt 1 generally should be convenient to make complete screw thread less than the external diameter of the thread section 11 of bolt 1, but the external diameter of expansion-head 13 should be greater than the internal diameter of the expansion arc 22 of expansion tube 2, so that when tighting a bolt, back down the outer bloated lobe of expansion tube, this EXPANSION ANCHOR BOLTS is firmly fastened in mounting hole.

The nut of this EXPANSION ANCHOR BOLTS can be the outer-hexagonal nut, hexagonal structure in also can in nut, making, and these can use for reference the structure of existing known technology.

The expansion-head 13 of above mentioned bolt 1, being made generally in the front end shown in the figure is a taper or bullet shaped tip, conveniently backs down expansion tube.

Preferably be carved with groove 14 between the screw section 11 of bolt 1 and the expansion-head 12, and the shape of groove 14 can be illustrated " V " shape, the also cutting of " U " shape, it can also be indentation, when bolt is screwed in expansion tube, after backing down expansion tube with expansion-head, expansion-head will be rotated with bolt on the one hand, push with expansion tube on the other hand, give to be screwed into and cause very big resistance, and the stress trace of indentation or groove or other form will make the screw section and the very fast disconnection of expansion-head of bolt, and expansion-head need not to rotate with bolt in jacking, reduces resistance greatly.

Owing to match with expansion tube in the screw section in the bolt, so there is not the gap between the two, tightens the back and be difficult for becoming flexible, tautness also improves greatly.

Claims

1, a kind of internal thread EXPANSION ANCHOR BOLTS, by bolt, expansion tube is formed, it is characterized in that: bolt is by nut, thread section, expansion-head is formed, expansion tube is made up of thread section and expansion arc, the thread section of expansion tube is shaped on the internal thread that matches with the thread section of bolt, the expansion arc of expansion tube front end has two or many axial grooves, and expansion arc is divided into two or many outer lobes that expand by axial groove, and the internal diameter of expansion tube expansion arc is less than the internal diameter of thread section, be shaped on indentation or groove between bolt expansion-head and thread section, the external diameter of bolt expansion-head is greater than the internal diameter of expansion tube expansion arc.

2, internal thread EXPANSION ANCHOR BOLTS according to claim 1 is characterized in that above-mentioned nut is the outer-hexagonal nut.

3, internal thread EXPANSION ANCHOR BOLTS according to claim 2 is characterized in that having interior hexagonal structure in the above-mentioned nut.

4, internal thread EXPANSION ANCHOR BOLTS according to claim 1 is characterized in that above-mentioned bolt expansion-head front end is a taper or bullet shaped tip.

5, internal thread EXPANSION ANCHOR BOLTS according to claim 1 is characterized in that being between above-mentioned bolt thread portion and the expansion-head " V " shape or the cutting of " U " shape.

6, internal thread EXPANSION ANCHOR BOLTS according to claim 1 is characterized in that having spring washer between above-mentioned bolt and expansion tube.