CN2310197Y

CN2310197Y - Inner expansion type screw bolt

Info

Publication number: CN2310197Y
Application number: CN 97235640
Authority: CN
Inventors: 杜荣庆
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-02
Filing date: 1997-04-02
Publication date: 1999-03-10
Anticipated expiration: 2007-04-02

Abstract

The utility model relates to the coupling member, particularly an expansion bolt composed of a bolt and an ejector rod inside the bolt. The tail of the bolt is provided with external screw-threads. The head of the bolt is provided with an opening. A through-hole communicated with the opening is arranged inside the bolt. The movable ejector rod is arranged inside the through-hole. The head of the ejector rod is slightly cuspate. The utility model has the advantages of convenient use, simple structure, etc.

Description

The inner intumescence type bolt

The utility model relates to coupling, specifically a kind of EXPANSION ANCHOR BOLTS that is made of bolt and inner push rod thereof.

Traditional expansion bolt is enclosed within the outer sleeve that has opening of bolt by one mostly and constitutes with the bigger bolt head that is positioned at bolt head.During use, burrow on the wall earlier, bolt and sleeve are put into the hole simultaneously, swivel nut is pulled out bolt, up to its bigger bolt head the opening of sleeve is opened, till the jail of expanding.The defective of this structure is when burrowing on the wall, and the diameter in hole is bigger than bolt, otherwise puts to enter, secondly, the object that will fix must be removed when burrowing, could hole, and after wanting earlier EXPANSION ANCHOR BOLTS to be buried, again fixture is brought up to the ability fastening nut, fixed object, just cumbersome for heavy objects, the position, hole is also difficult to be aimed at, the 3rd, after in a single day used EXPANSION ANCHOR BOLTS is imbedded, just can't take out, bring certain trouble to operation.

The purpose of this utility model is a kind of inner intumescence type bolt easy to use, simple in structure of design, to overcome problem such as operating difficulties.

Its main technical schemes is that the afterbody at bolt has outside thread, bolt head has opening, there is through hole inside, and this through hole and open communication are placed mobilizable push rod in the through hole, the push rod head is point slightly, outer surface at bolt head has the reticulate pattern that increases frictional force, and its opening has one section expansion arc that joins with through hole, and the outside thread of bolt tail is combined with packing ring and nut, afterbody at push rod has the push rod cap that is slightly larger than push rod, and described opening has "-" font or "+" font or " * " font etc.

The utility model has the advantages that owing to adopt bolt and inner post rod type structure thereof, during use, only need bore a hole close on the wall, bolt be put into, then with the bolt profile, impact push rod with hammer, up to push rod except that the push rod cap, all imbed in the bolt hole till, the work of burying underground is promptly accused and is finished, therefore, more convenient during use, and, as the hole finding to bury underground not to the time, only need push rod is firmly extracted, bolt can be removed, therefore, and with original comparing, operation is difficult for causing waste than being easier to.

Fig. 1 is a structural drawing of the present utility model:

As shown in the figure: the afterbody at bolt 3 has outside thread 4, the outer surface of bolt head 12 is useful on the reticulate pattern 9 that increases frictional force, the opening 11 that "+" font is arranged at bolt head 12 places, through hole 7 is arranged in bolt 3, this through hole 7 is communicated with opening 11, and extend in the bolt head always, opening at bolt head also has one section expansion arc 10 that joins with through hole, in the through hole 7 of bolt, push rod 2 is arranged, the afterbody of this push rod has bigger push rod cap 1, push rod head 8 is slightly sharp frustoconic shape or terrace with edge shape, attaching nut 5 and packing ring 6 on the outside thread 4 of bolt 3.

During use, bolt is inserted in the hole of having accomplished fluently on the wall, insertion depth is decided on usage requirement, but must there be one section outside thread to imbed in the hole, again push rod be inserted in the through hole, and knock with iron hammer, till running into bolt to the push rod cap, the push rod head is stretched in the expansion arc of bolt head opening, force bolt head to open, make bolt be expanded the jail tightly in the hole.At this moment, can use nut fastening again with the slipease that requires to fix on bolt, article just be fixed on the wall firmly.

Claims

1, inner intumescence type bolt is characterized in that the afterbody of bolt (3) has outside thread (4), and bolt head (12) has opening (11), through hole (7) is arranged in the bolt (3), this through hole (7) is communicated with opening (11), places mobilizable push rod (2) in the through hole (7), and push rod head (8) is point slightly.

2, bolt according to claim 1 is characterized in that at the outer surface of bolt head (12) reticulate pattern (9) that increases frictional force being arranged.

3, bolt according to claim 1, its feature is located one section expansion arc (10) that joins with through hole (7) at the opening (11) of bolt head (12).

4, bolt according to claim 1 is characterized in that locating to be combined with packing ring (6) and nut (5) at the outside thread (4) of bolt (3) afterbody.

5, bolt according to claim 1 is characterized in that at the afterbody of push rod (2) the push rod cap (1) that is slightly larger than push rod (2) being arranged.

6, bolt according to claim 1, the section configuration that it is characterized in that the opening (11) of bolt head (12) can be "-" font or "+" font or " * " font.