WO2004020842A2

WO2004020842A2 - Anchor bolt

Info

Publication number: WO2004020842A2
Application number: PCT/KR2003/001752
Authority: WO
Inventors: Tae Hoon Oh
Original assignee: Tae Hoon Oh
Priority date: 2002-08-29
Filing date: 2003-08-29
Publication date: 2004-03-11
Also published as: AU2003256115A8; AU2003256115A1; KR200308709Y1; WO2004020842A3

Abstract

Disclosed herein is an anchor bolt, which is used to firmly fix a certain structure to a concrete wall body for the installation of the structure to the concrete wall body. The anchor bolt comprises a bolt body formed at its one side with a screw portion and at the other side thereof with a tapered portion. Around the bolt body of the anchor bolt are installed a wedge formed with incisions and bosses and a hollow tube. The hollow tube is made of a material softer than that of the wedge. For the fixing of the anchor bolt, after the anchor bolt is hammered in a state wherein it is inserted into a bore formed in the concrete wall body, the nut is screwed so as to cause the wedge to be expanded and firmly fixed in the concrete wall body.

Description

ANCHOR BOLT

Technical Field

The present invention relates to an anchor bolt for firmly fixing a certain structure to a concrete wall body when it is desired to install the structure generating a relatively large load, such as a telephone pole, soundproof wall, elevator, or the like, to the bottom or wall surface of the concrete wall body having no appropriate support means.

Background Art

Referring to Fig. 1 illustrating an example of conventional anchor bolts, the illustrated conventional anchor bolt comprises a bolt body 1, a cap 2 configured to receive the bolt body 1 therein, and a nut 6. The bolt body 1 is formed at its one end portion with a tapered portion, and at the other end portion thereof with a screw portion 5. The cap 2 is formed with an incision 4. For the fixing of the conventional anchor bolt, first, after the bolt body 1 and the cap 2 receiving the bolt body 1 therein are inserted into a bore 3 formed in a concrete wall body C, the cap 2 is hammered with a separate jig, thereby causing the incision 4 formed at the cap 2 to be opened by the tapered portion of the bolt body 1. In this way, the anchor bolt is adapted to come into close contact with and be fixed in the bore 3 formed in the concrete wall body C. In this fixed state, a certain structure 10 to be installed is fastened onto the anchor bolt through the screw portion 5 of the bolt body 1 located out of the bore 3, and finally the nut 6 is screwed onto the screw portion 5. The conventional anchor bolt constructed as stated above, however, has drawbacks in that, due to the use of the separate hammering jig, the overall fixing thereof is somewhat troublesome and the opening of the incision 4 is insufficient thus deteriorating the fixing stability of the anchor bolt.

As another example, an L-shaped conventional anchor bolt as shown in Fig. 2 is constructed in such a fashion that an L-shaped bolt body 9 thereof is previously embedded in a concrete wall body C before the curing of concrete. Although this L-shaped anchor bolt has an advantage in that it can be firmly fixed in the concrete wall body C, due to the fact that its installation position is predetermined, it induces a serious drawback in that it cannot be used if the installation position of a certain structure 10 is changed.

Figs. 3a and 3b illustrate yet another conventional anchor bolt characterized in that a bolt body 12 thereof is provided with a stopper 12a at the front portion thereof, and a wedge 13 is fitted around the bolt body 12 at a position adjacent to a tapered portion 12b formed at the front end portion of the bolt body 12. Considering the fixing procedure of the anchor bolt, first, after the bolt body 12, which is fitted with the wedge 13 as shown in Fig. 3a, is inserted into a bore 4 formed in a concrete wall body C, and hammered to be firmly fixed, a certain structure 10 to be installed is fastened through a screw portion 5 formed at the rear portion of the bolt body 1 , and then a nut 6 is screwed onto it. In this state, by virtue of the screwing force of the nut 6, as shown in Fig. 3b, the tapered portion 12b of the bolt body 12 expands the wedge 13 as the bolt body 12 is withdrawn along the bore 4, thereby allowing the bolt body 12 to be firmly fixed in the bore 4 by the wedge 13 so as not to be removed from the bore 4. The wedge 13 is formed along the outer periphery thereof with a plurality of bosses 14.

In case of the anchor bolt shown in Figs. 3a and 3b, the stopper 12a serves to fix the position of the wedge 13 in order to prevent the wedge 13 from moving backward when the bolt body 12 is inserted into the bore 4 as a head portion 12d located in front of the screw portion 12c of the bolt body 12 is hammered. Since the stopper 12a has to be separately molded, and the assembly work of the wedge 13 requires a separate press work, the anchor bolt has drawbacks related with a high manufacturing cost and a poor fastening force of the wedge.

Disclosure of the Invention

Therefore, the present invention has been made in view of the above drawbacks, and it is an object of the present invention to provide an anchor bolt, which can reduce a manufacturing cost by virtue of its simplified manufacturing process, facilitate the installation work thereof, and improve the fastening force of a wedge provided therein. In accordance with the present invention, the above and other objects can be accomplished by the provision of an anchor bolt comprising a bolt body formed at its one side with a screw portion and at the other side with a tapered portion, and a _,

wedge installed around the bolt body, further comprising a hollow tube installed around the bolt body.

Brief Description of the Drawings

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a side sectional view illustrating a conventional anchor bolt;

Fig. 2 is a side sectional view illustrating another conventional anchor bolt;

Figs. 3a and 3b are side sectional views illustrating the installation procedure of yet another conventional anchor bolt;

Fig. 4 is a side view illustrating an anchor bolt in accordance with the present invention;

Fig. 5 is an exploded perspective view illustrating the anchor bolt according to the present invention; and Figs. 6a and 6b are side sectional views illustrating the installation procedure of the anchor bolt according to the present invention, Fig. 6a illustrating a state before a wedge portion of the anchor bolt is expanded, Fig. 6b illustrating a fixed state of the anchor bolt after the wedge portion is expanded.

Best Mode for Carrying Out the Invention

As shown in Figs. 4 and 5, the anchor bolt, designated as reference numeral

20, in accordance with the present invention comprises a bolt body 21, and a hollow tube 22, a wedge 23, a nut 24, and a washer 25, which are fitted around the bolt body 21.

The bolt body 21 has a screw portion 21 a formed at its one side, to which the nut 24 will be screwed, and a tapered portion 21c formed at the other side thereof. The tapered portion 21c is provided for causing the expansion of the wedge 23. At the tip end of the screw portion 21a is formed a head portion 21b, which serves to prevent damage to the screw portion 21a during hammering work of the anchor bolt. To the bolt body 21, the wedge 23, hollow tube 22, washer 25 and nut 24 are assembled in order.

The wedge 23 is formed with one or more incisions 23a, which are adapted to be expanded as the nut 24 is screwed. The wedge 23 is further formed along the outer edge opposite to the incisions 23a with a plurality of bosses 23b. These bosses 23b endow the wedge 23 with a frictional force. Preferably, the inner diameter portion of the wedge 23 is tapered corresponding to the tapered portion 21c of the bolt body 21 so as to come into close contact with it.

The hollow tube 22 serves to prevent the withdrawal of the wedge 23 when the anchor bolt 20 is hammered and fitted into a bore 4 formed in a concrete wall body C or when the nut 24 is screwed.

Preferably, the hollow tube 22 is made of aluminum, brass, or the like, which is softer than a material constituting the wedge 23. In this case, as the nut 24 is strongly screwed and tightened, the soft hollow tube 22 is crumpled and constricted, thereby filling up to a certain extent gaps defined between the hollow tube 22 and the bolt body 21 and between the anchor bolt 20 and the bore 4 formed in the concrete wall body C. As a result, the anchor bolt 20 can be more closely come into contact with and be fixed in the concrete wall body C.

The size of the hollow tube 22 can be appropriately selected according to the various sizes of the bolt body 21. Now, the installation procedure of the anchor bolt 20 into the concrete wall body C in accordance with the present invention will be explained with reference to Figs. 6a and 6b.

First, as shown in Fig. 6a, in a state wherein the wedge 23 and hollow tube 22 are assembled to the bolt body 21 of the anchor bolt 20, the anchor bolt 20 is hammered with certain hammer means, and fitted into the bore 4 formed in the concrete wall body C.

The anchor bolt 20, fitted into the bore 4 of the concrete wall body C as stated above, is still exposed at the screw portion 21a thereof to the outside, and as the nut 6 is screwed and tightened around the screw portion 21a of the bolt body 21 by the use of a tool, the bolt body 21 is withdrawn, thereby causing the wedge 23 to be expanded by the tapered portion 21c formed at the distal end of the bolt body 21. As a result, as shown in Fig. 6b, the wedge 23 a comes into strong contact with the wall surface of the bore 4 so as not to be removed therefrom.

In the case that the hollow tube 22 is made of soft aluminum, brass, or the like, as the nut 24 is strongly screwed and tightened, the hollow tube 22 is constricted, thereby filling up to a certain degree gaps defined between the hollow tube 22 and the bolt body 21 and between the anchor bolt 20 and the bore formed in the wall body, resulting in an increase in frictional forces therebetween. This increases the fixing force of the anchor bolt 20.

Industrial Applicability

As apparent from the above description, the present invention provides an anchor bolt, which can simplify a manufacturing process and installation work thereof compared with conventional products, and achieve a good fixed state thus having economical advantage.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

Claims:

1. An anchor bolt comprising a bolt body formed at its one side with a screw portion and the other side thereof with a tapered portion, and a wedge formed with incisions and bosses, the wedge being installed around the bolt body, further comprising: a hollow tube installed around the bolt body.

2. The anchor bolt as set forth in claim 1, wherein the hollow tube is made of a material softer than that of the wedge.