AU696114B2

AU696114B2 - Chemically-set anchor stud system

Info

Publication number: AU696114B2
Application number: AU20076/95A
Authority: AU
Inventors: Sylvester Liem
Original assignee: ITW Construction Systems Australia Pty Ltd
Current assignee: ITW Construction Systems Australia Pty Ltd
Priority date: 1994-05-25
Filing date: 1995-05-17
Publication date: 1998-09-03
Anticipated expiration: 2015-05-17
Also published as: AU2007695A

Description

Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

(ORIGINAL)

Name of Applicant: Ramset Fasteners (Australia) Pty.Limited Actual Inventor(s): LIEM, Sylvester a Address for Service: DAVIES COLLISON CAVE, Patent Attorneys, o 1 Little Collins Street, Melbourne, 3000.

S. Invention Title: "Chemically-set Anchor Stud System" Details of Associated Provisional Application(s): No(s): SPM5877/94 filed 25 May, 1994.

The following statement is a full description of this invention, including the best method of performing it known to me/us: -1la CHEMICALLY-SET ANCHOR STUD SYSTEM The present invention relates to an anchor stud system of dithe type comprising a threaded anchor stud which is set within a hole drilled into masonry by means of a hardenable adhesive. An anchor stud system of this type is commonly known as a chemical anchoring system.

A typical chemically-set system of the type specified above comprises an anchor stud and a capsule consisting of a two-part adhesive, for example vinylester resin and hardener. The capsule is inserted into the bottom of the hole and then the stud is inserted into the hole. The end of the stud is chiselled in order to break the capsule when a hammer force is applied to the outer end of the stud. The design of the capsule is such 'o*o that it requires both hammering and rotation of the stud to break the capsule, mix the components and cause the mixture to extrude rearwardly along the shank of the stud to S thereby form a bond between the stud shank and the wall of the hole. This required action can be applied by means of a hammer drill and for this purpose the outer end of the stud is formed with a hexagonal socket to receive an allen key mounted within the chuck of a to o standard hammer drill. While this previously proposed system operates satisfactorily it does require the use of a hammer drill to set the anchor stud. Although a hammer drill will usually be available on a building site, when, as is often the case in practice, a large number of anchor studs are required to be installed, the hammer drill will be in use for long periods of time drilling the holes and therefore may not be always available for use by a person setting the studs into the holes.

According to the present invention, taere is provided an anchor system comprising an anchor stud adapted to be inserted into a hole drilled into masonry, a capsule of hardenable adhesive formed by components which mix together when the capsule is broken, the capsule being insertable into the base of the hole and the inner end of the stud being of a configuration to cause breaking of the capsule and mixing with the components when hammer blows are applied to the stud, and wherein the capsule comprises a viscous resin and a hardener, the hardener being at an outer end of the capsule such that when the 980713,j:\oper\rslfastcnin8. spe, I stud is driven into the hole to break the capsule the movement of the stud forces the hardener through the resin to cause mixing of the hardener and resin, and a punch tool for setting the stud within the hole, said tool having an internal blind bore leading from the inner end of the tool to receive within the bore the outer end portion of the stud whereby hammer blows can be applied to the outer end of the tool to drive the stud into the hole to break the capsule, cause inter-mixing of the components, and extrusion of the mixture outwardly along the shank of the stud.

Preferably, the depth of the blind bore is such that when the inner end of the tool is level with the surface of the masonry, the stud will be set to a prescribed depth within the hole.

An embodiment of the invention will now be described, by way of example only, too. with reference to the accompanying drawings in which:- Figure 1 is a side view of a threaded stud used in the anchor system of the preferred embodiment of the invention; Figure 2 is a side view, in section, of a two-part adhesive capsule used in the system; and Figure 3 is a side view, partially in section, of a setting tool.

The system in accordance with the preferred embodiment of the invention comprises an anchor stud 2 (Figure 1) having a chisel point 4 at its inner end, a capsule 6 (Figure 2) of two-part adhesive, and a setting tool 8 (Figure The capsule 6 consists of a resin 10 in the form of a viscous liquid and a hardener 12 separated by an intermediate barrier 14. The setting tool 8 consists of a cylindrical punch with an internal bore 16 of a diameter to receive the outer end of the stud 2. The depth of the bore 16 is such that when the forward end 8a of the punch abuts against the surface of the masonry and hence is level with the surface of the masonry, the stud 2 will be set into the hole to the required depth.

G In use, a hole to the required depth is drilled into the masonry and then the capsule 980713,p:\oper\rslh,faslerdning.spc,2

I

-3- 6 is inserted so that the end of the capsule 6 carrying the resin 10 is towards the bottom of the hole. The stud 2 is inserted into the hole and the tool 8 is placed over the outer end of the stud 2 and is struck repeatedly with a hammer so that the stud 2 is driven further into the hole, breaks the capsule 6 and forces the hardener 12 through the resin 10 so as to cause mixing of the components, and as the stud 2 is driven deeper into the hole the viscous mixture is extruded back along the shank of the stud to form a bond between the shank and the wall of the hole, no rotation of the stud 2 being required to achieve mixing and setting of the stud. Correct setting is achieved when the inner end 8a of the tool 8 meets the face of the masonry. The use of the tool prevents damage occurring to the threaded outer end of the stud 2 during insertion and also effects insertion into the required depth and more accurate centring of the stud 2 within the hole.

Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will 15 be understood to imply the inclusion of a stated integer or group of integers or steps but not the exclusion of any other integer or group of integers.

The embodiment has been described by way of example only and modifications may be made within the scope of the invention.

980713,p:\oper\rsh,fnstening.spe,3

Claims

1. An anchor system comprising an anchor stud adapted to be inserted into a hole drilled into masonry, a capsule of hardenable adhesive formed by components which mix together when the capsule is broken, the capsule being insertable into the base of the hole and the inner end of the stud being of a configuration to cause breaking of the capsule and mixing with the components when hammer blows are applied to the stud, and wherein the capsule comprises a viscous resin and a hardener, the hardener being at an outer end of the capsule such that when the stud is driven into the hole to break the capsule tie movement of the stud forces the hardener through the resin to cause mixing of the hardener and resin, and a punch tool for setting the stud within the hole, said tool having an internal blind bore leading from the inner end of the tool to receive within the bore the outer end portion of the stud whereby hammer blows can be applied to the outer end of the tool to drive the stud into the hole to break the capsule, cause inter-mixing of the components, and extrusion of the mixture outwardly along the shank of the stud.

2. An anchor system according to claim, wherein the depth of the blind core is such that when the inner end of the tool is level with the surface of the masonry, the stud is set to a prescribed setting depth within the hole.

3. An anchor system substantially as hereinbefore described with reference to the accompanying drawings.

4. A method of setting an anchor using an anchor system according to any one of claims 1 to 3, comprising drilling a hole into masonry, inserting the capsule into the base of the hole, inserting the stud into the hole, applying the punch tool over the exposed outer end of the stud and applying hammer blows to the tool to drive the stud further into the 980713,p:\oper\rsh, fostening.spe,4 I hole to break the capsule, cause intermixing of the omponents and extrusion of the mixture outwardly along the shank of the stud. DATED this 13th day of July, 1998. RAMSET FASTENERS (AUST.) PTY.LIMITED By its Patent Attorneys: DAVIES COLLISON CAVE i t o e 9807 13.p:\opcr\rshaslening.spe,5 c ABSTRACT A chemically-set anchor stud system comprises a punch with a blind bore (16) to receive the outer end of the stud, and a capsule of resin and hardener. When the capsule and stud are inserted into a hole drilled into masonry, hammer blows applied to the punch to force the stud further into the hole will cause the stud to break the capsule and cause mixing of the hardener with the resin, and extrusion of the mixture outwardly along the shank of the stud. e* 6* o S* a a *e 88 950516,p:oper\rshzfastening.spe,6