CHISEL FOR DUST-FREE CHASING OF BRICK STRUCTURES

Title:

CHISEL FOR DUST-FREE CHASING OF BRICK STRUCTURES

Document Type and Number:

WIPO Patent Application WO/1992/002345

Kind Code:

A1

Abstract:

A chisel for cutting grooves, recesses and penetrations into brick structure without producing dust. The chisel comprises a handle with tapers to form a leading edge (A). The tapered region has a curved upper surface (C) with a V-cut or concave section, and a flat lower surface angled at thirteen degrees (13°) to the longitudinal axis of the handle. The leading edge of the chisel has a forty five degrees (45°) bevel (B) and a recess (D) located at the blade face, on the longitudinal axis of the chisel and recessed inwards towards the chisel body. The leading edge (A) has a V-shape from plan view, with the recess (D) forming the base of the V, and the lateral ends projecting away from the chisel body. The recess (D) allows material particles to be removed while the chisel is used. The chisel may be fifteen millimeters (15 mm) to forty millimeters (40 mm) wide and may be made of water-hardened carbon-vanadium tool steel, or a similar material. The chisel eliminates any sawing operation to cut grooves, recesses and penetrations into brickwork. The design of the chisel concentrates an area of impact and allows positive control of the cut. The operation generates no dust.

Inventors:

KEMPIN RONALD (AU)

Application Number:

PCT/AU1991/000328

Publication Date:

February 20, 1992

Filing Date:

July 24, 1991

Export Citation:

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Assignee:

KEMPIN RONALD (AU)

International Classes:

B25D3/00; B28D1/26; (IPC1-7): B25D3/00; B27G17/08; B28D1/26; E21C37/26

Foreign References:

AU1498847A
US2172984A	1939-09-12
US2392495A	1946-01-08
AU4528272A	1974-02-07
US1471062A	1923-10-16
EP0131688A2	1985-01-23

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Claims:

*The claims defining the invention are as follows:

1.	An optimising cπasing chisel for cutting grooves, recesses penetrations into bricK structures uithour producing dust. The deβign allows the cnisel to optimise the removal of mat b laminar separation.

Description:

Invention Title:

The following statement is a full description of this invention, inciuding the best method of performing it known to me:-

This invention relates to improvements in dust free chasing of bric structures ^'.

Some methods of chasing such as drilling or sauing create ^' much dust

which can be an occupational health hazard .

hJL _,s.. _,chisel . ^ penetrations into brick structures. No dust is produced.

The design allous the chisel to optimise the removal of materials by ^*"ϊiil ^ήιna ^'"se ^'para £on ^'. ^'

The design includes a specially bevelled (AJ, faced (B ) and surface

(C) leading edge design, including a recess (D) to remove material particles.

The chisel may be entered into and driven through the brickwork by hammering.

Depth and straightness of the grooves or recesses and cleanness or cut are achieved by addressing the chisel at tne optimum angle of attack uhich follows from the design.

The material for this cnisel is water hardened carbon-vanadium tool steel, or similar.

This optimising chasing chisel removes the material without ma dust.

The width of tne chisel may be 15mm to 40mm depending on rβqui of tne groove. imensions may be varied to suit the sije of t tool steel materials.

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