CN2385129Y

CN2385129Y - Expansion bolt combined with expanding sleeve

Info

Publication number: CN2385129Y
Application number: CN 99229206
Authority: CN
Inventors: 王万荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-16
Filing date: 1999-08-16
Publication date: 2000-06-28
Anticipated expiration: 2009-08-16

Abstract

The utility model relates to an expansion bolt with a core plug, which belongs to a fastener. The expansion bolt with a core plug is characterized in that the expansion bolt with a core plug is composed of a bolt body and a steel core. A plurality of annular grooves are arranged along a circumference direction on the outer circumference surface of an expansion head. Two radial dividing grooves are also arranged on a basal body of the expansion head simultaneously, and are crossed in a cross shape. A shaft center of the bolt body is provided with a central hole, of which an opening is backward. The bottom of the central hole forms a cone shape. The steel core is inserted into the central hole, and the front end also forms a cone shape. The expansion bolt with a core plug has the advantages of convenient operation, fewer damages to the basal body, high tensile strength after installation, and wide ranges of application.

Description

Core plug expansion bolt

The utility model belongs to fastening piece, relates to a kind of core plug expansion bolt.

At present, hydropower installation, architectural decoration extensively adopt EXPANSION ANCHOR BOLTS as fastening piece.Common EXPANSION ANCHOR BOLTS generally is made up of the screw rod of swollen head and expansion sleeve and the fastening screw nut that is enclosed within outside the screw rod.This EXPANSION ANCHOR BOLTS parts are more, use, install inconvenience.Because expansion sleeve is enclosed within outside the screw rod, whole outside dimension is bigger, and is also bigger to the destruction that matrix is installed during use.Simultaneously, because the wall thickness of expansion sleeve is thinner, the outer surface friction factor is lower, thereby the tensile strength after installing is lower.In addition, after common EXPANSION ANCHOR BOLTS was used, installed, its screw front end often stretched out attachment face, can not adapt to the installation of some special occasions, thereby the narrow limitation of using is bigger.

The purpose of this utility model is, a kind of novel fastening piece core plug expansion bolt is provided, and makes it can satisfy use, easy for installation, matrix destroyed little, and back tensile strength height is installed, and requirement applied widely.

The technical solution of the utility model is, this core plug expansion bolt is made up of key and steel core, columned key front end is an expansion-head, its rear end is the bolt head, along the circumferential direction have some roads circular groove on the outer peripheral surface of described expansion-head, also have simultaneously two radially slot segmentations on the matrix of expansion-head, they are " cross " and intersect, and whole expansion-head vertically is divided into four parts, in addition, in the key axle center, opening center hole is backward arranged, the bottom of center hole is tapered, and surpass the bottom of above-mentioned slot segmentation, described steel core is inserted in the center hole, and its front end also is taper, and steel core length is greater than the center hole degree of depth.The bolt head can adopt the cup head similar to plain screw, countersunk raised head or countersunk head shape, to adapt to the requirement of different occasions.

The utility model has the advantages that the whole erection parts are few, only need key is put into the installation matrix, again steel core is squeezed into key and can be finished the installment work process, extremely easy to use; During installation, because key is directly put into matrix, thereby the mounting hole diameter of being beaten on the matrix is less, and is also less to the destruction of matrix; Simultaneously, owing on the expansion-head outer surface, can have darker circular groove, thereby increased friction factor, improved the tensile strength after installing greatly; In addition, during owing to use, key gos deep into matrix, and steel core is also squeezed into key and do not exposed, thereby applicable to special occasions, applied range.

Below in conjunction with accompanying drawing embodiment of the present utility model is described further:

Fig. 1 is a configuration diagram of the present utility model;

Fig. 2 is a key structural drawing of the present utility model;

Fig. 3 is structure of steel pole figure of the present utility model;

Fig. 4 is that the bolt head is the user mode figure of the core plug expansion bolt of semicircle capitiform;

Fig. 5 is that the bolt head is the user mode figure of the core plug expansion bolt of countersunk raised head shape;

Fig. 6 is that the bolt head is the user mode figure of the core plug expansion bolt of countersunk head shape.

As shown in Figure 1-Figure 3, this core plug expansion bolt is made up of key 1 and steel core 2, and columned key 1 front end is an expansion-head 3, and its rear end is a bolt head 4, along the circumferential direction has some roads circular groove 5 on the outer peripheral surface of expansion-head 3.Also have simultaneously two radially slot segmentations 6 on the matrix of expansion-head 3, they are " cross " and intersect, and whole expansion-head vertically is divided into four parts.In addition, in the axle center of key 1, opening center hole 7 is backward arranged, the bottom of center hole 7 is tapered, and surpasses the bottom of above-mentioned slot segmentation 6, and steel core 2 is inserted in the center hole 7, and its front end also is taper, and the length of steel core 2 is greater than the degree of depth of center hole 7.On the key outer surface between bolt head 4 and the expansion-head 3, also be evenly distributed with some elongated slots longitudinally 8, the friction when using between key and installation matrix to increase.

As Fig. 4-shown in Figure 6, core plug expansion bolt passes assembling set 10 with its key 1 in use, insert the mounting hole of installing on the matrix 9, after being in place steel core 2 is squeezed into key 1, the steel core front end just makes expansion-head 3 outside distendings whole key 1 and assembling set 10 to be fixed on and installs on the matrix 9.

Claims

1, a kind of core plug expansion bolt, it is characterized in that: this core plug expansion bolt is made up of key (1) and steel core (2), columned key (1) front end is expansion-head (3), its rear end is bolt head (4), along the circumferential direction have some roads circular grooves (5) on the outer peripheral surface of described expansion-head (3), on the matrix of expansion-head (3), also have simultaneously two radially slot segmentations (6), they are " cross " and intersect, whole expansion-head vertically is divided into four parts, in addition, there is opening center hole (7) backward in axle center in key (1), and the bottom of center hole is tapered, and surpass the bottom of above-mentioned slot segmentation (6), described steel core (2) is inserted in the center hole (7), and its front end also is taper, and steel core (2) length is greater than center hole (7) degree of depth.

2, core plug expansion bolt according to claim 1 is characterized in that: described bolt head (4) is the semicircle capitiform.

3, core plug expansion bolt according to claim 1 is characterized in that: described bolt head (4) is a countersunk raised head shape.

4, core plug expansion bolt according to claim 1 is characterized in that: described bolt head (4) is a countersunk head shape.

5, according to the described core plug of claim 1-4 expansion bolt, it is characterized in that: on the key outer surface between bolt head (4) and the expansion-head (3), be evenly distributed with some elongated slots longitudinally (8).