CN2336126Y

CN2336126Y - Countersunk expansion bolt

Info

Publication number: CN2336126Y
Application number: CN 98227489
Authority: CN
Inventors: 王万荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-07-30
Filing date: 1998-07-30
Publication date: 1999-09-01
Anticipated expiration: 2008-07-30

Abstract

The utility model relates to a countersunk expansion bolt. One end of an expansion pipe is provided with four longitudinal elongated grooves which are uniformly arranged along the circumference. A bolt head with screw-threads is threaded out of an open groove of the expansion pipe. A nut screwed on the bolt is a conical nut which is cone-shaped, and toward the axial direction, a cylindrical section which has the diameter same as the diameter of the cone and less than the internal diameter of the expansion pipe is extended out of one end of the cone which has smaller diameter. The utility model has the advantages of strong pulling force, convenient and reliable operation and strong pulling force, and when used, without exposure, the bolt head of the bolt is hidden inside.

Description

Hide the hair style EXPANSION ANCHOR BOLTS

The utility model belongs to fastening piece, relates to a kind of Tibetan hair style EXPANSION ANCHOR BOLTS.

Present widely used EXPANSION ANCHOR BOLTS, reaching the hexagon nut that cooperates with bolt by expansion tube and the swollen hook bolt that passes expansion tube forms, when this EXPANSION ANCHOR BOLTS is used, by the outside turnbuckle of rotation hexagon nut, the expansion tube that the swollen head of bolt will have vertical elongated slot outwards struts, whole EXPANSION ANCHOR BOLTS is fixed on installs in the matrix, reach the installation purpose, because the thread head of nuts and bolt is exposed at outside matrix and the installation material, this not only influences the outward appearance after the installation, and in some cases (as the installation of retractable door and Crane Rail etc.), it is smooth to require to install the back outer surface, no projection, the thread head that at this moment exposes has just influenced the installation effect, and is very inconvenient.And the worm tooth number that the hexagon nut of standard cooperates with bolt is few, and the pulling force of carrying is less, and reliability is also relatively poor.

The purpose of this utility model provides a kind of novel Tibetan hair style EXPANSION ANCHOR BOLTS, and when installation material was installed, the thread head of EXPANSION ANCHOR BOLTS was hidden in matrix inside, did not influence the installation outer surface, and bolt uses reliably, pulling force is strong.

The technical solution of the utility model realizes by following structure: promptly this Tibetan, Tibetan hair style EXPANSION ANCHOR BOLTS comprises expansion tube, screw bolt and nut, one end of described expansion tube has four vertical elongated slots equably along circumference, the thread head of bolt passes from the fluting end of expansion tube, the nut that is spun on the bolt is a tapered cup nut, its profile is a taper type, and the less end of the diameter of frustum is to extending axially out one section isometrical cylindrical part, and this cylindrical part diameter is less than the expansion tube internal diameter.Can also be at the outer surface of tapered cup nut along circumference four the vertical anti-skidding muscle that distribute equably, corresponding with the elongated slot on the expansion tube.Described bolt can adopt the hexagon head bolt of standard, also can adopt countersunk screw.

The utility model has the advantages that, because the structure that adopts nut to cooperate with plain bolt and expansion tube, the thread head of bolt screws in matrix inside and does not expose during use, not only makes the installation outer surface attractive in appearance, and can make the smooth no projection of outer surface is installed, increase the Applicable scope of EXPANSION ANCHOR BOLTS.Simultaneously, the tapered cup nut axial thickness that has cylindrical part is bigger, and the worm tooth number that cooperates with bolt is more, thereby the pulling force that bears is big.In addition, the anti-skidding muscle of tapered cup nut outer surface cooperates with the elongated slot on the expansion tube, plays the effect that prevents that tapered cup nut from rotating in installation, makes easier for installation reliable.

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

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

Fig. 2 is the structural drawing of expansion tube;

Fig. 3 is the shape assumption diagram of tapered cup nut;

Fig. 4 is a user mode schematic representation of the present utility model;

Fig. 5 is another embodiment's of the utility model a structural drawing.

As shown in Figure 1, Tibetan of the present utility model hair style EXPANSION ANCHOR BOLTS comprises expansion tube 1, bolt 2 and tapered cup nut 3, one end of expansion tube 1, have four vertical elongated slots 4 (as shown in Figure 2) equably along circumference, the thread head of bolt 2 passes from the fluting end of expansion tube 1, tapered cup nut 3 is spun on the bolt 2, its shape of tapered cup nut 3 as shown in Figure 3, be taper type, and the less end of the diameter of frustum is to extending axially out the isometrical cylindrical part of section, the surface of tapered cup nut 3 is evenly distributed with four vertical anti-skidding muscle 5 along circumference, and is corresponding with the elongated slot 4 on the expansion tube 1.The thread head of bolt stretched into matrix and does not expose when as shown in Figure 4, this Tibetan hair style EXPANSION ANCHOR BOLTS was used.Described bolt 2 can be a hexagon head bolt shown in Figure 1, also can be countersunk screw shown in Figure 5.

Claims

1, a kind of Tibetan hair style EXPANSION ANCHOR BOLTS, comprise expansion tube (1), bolt (2) and nut, it is characterized in that: an end of described expansion tube (1) has four vertical elongated slots (4) equably along circumference, the thread head of bolt (2) passes from the fluting end of expansion tube (1), and the nut that is spun on the bolt (2) is tapered cup nut (3), and its profile is a taper type, and the less end of the diameter of frustum is to extending axially out one section isometrical cylindrical part, and this cylindrical part diameter is less than the expansion tube diameter.

2, according to the Tibetan hair style EXPANSION ANCHOR BOLTS of claim 1, it is characterized in that: the outer surface of described tapered cup nut (3) is evenly distributed with four vertical anti-skidding muscle (5) along circumference, and is corresponding with the elongated slot (4) on the expansion tube (1).

3, according to the Tibetan hair style EXPANSION ANCHOR BOLTS of claim 1 or 2, it is characterized in that: described bolt (2) is a hexagon head bolt.

4, according to the Tibetan hair style EXPANSION ANCHOR BOLTS of claim 1 or 2, it is characterized in that: described bolt (2) is a countersunk screw.