AU704420B2

AU704420B2 - Improvements in or relating to woks

Info

Publication number: AU704420B2
Application number: AU65540/96A
Authority: AU
Inventors: John William Mcclean
Original assignee: Breville Pty Ltd; Breville R&D Pty Ltd
Current assignee: Breville Pty Ltd
Priority date: 1995-09-28
Filing date: 1996-09-10
Publication date: 1999-04-22
Anticipated expiration: 2016-09-10
Also published as: AU6554096A

Description

AUSTRALIA

Patents Act 1990 BREVILLE PTY LTD

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT .b .be 6 Ce be

C

4tt *6 *b bS

C.

be..

I C 4b C ebb.

C C C. e

C

Invention Title- Improvements int or relatintg to woks The following statement is a full description of this invention including the best method of performing it known to us:- The present invention relates to woks and more particularly to electrically heated woks.

Electrically heated woks normally have a relatively flat central portion, to the underside of which an electric heating element is attached. While such woks are reasonably satisfactory they do have the defect that the heat is mainly concentrated at the bottom of the container and relatively little heat is available for cooking food in the curved area of the wok surrounding the central portion.

Users of woks that do not incorporate an electric heating element usually keep the wok in movement over a gas flame so that heat is applied not only to the bottom of the wok but to portions of the sides adjacent the central portion. The object of the present invention is to provide an electrically heated wok having a heating element embracing the curved portions of the wall of the wok surrounding the central portion.

Woks are made from a variety of different materials and in particular pressed aluminium sheet or cast aluminium. Where the wok is made from sheet aluminium the heating element is attached by welding or brazing; where the wok is made from cast aluminium the heating element is attached by being staked into a groove formed on the outer surface of the wok.

20 The present invention consists in a wok having an electric heating element a first portion of which extends in the area of the underside of the central portion of the wok and a second portion continuous with the first portion which extends circumferentially on the underside of the wok in a substantially part circular path extending over curved portions of the wok surrounding the central portion, the heating element being secured to the outer surface of the wok; wherein, the heating element is terminated in a pair •of adjacent connectors, the first portion of the element defining opposed generally "C"-shaped portions substantially symmetrically disposed about a plane passing midway between the connectors and through the centre of the wok, each of the generally "C"-shaped portions then bending in an opposite sense to the curve of the "C"-shape to join with the second portion, said second portion also being substantially symmetrically disposed about the S plane.

o 0" In order that the nature of the invention may be better understood a preferred form thereof is illustrated, by way of example, in the accompanying drawings, in which: Figure 1 is a view of the underside of a wok according to one form of the invention; Figure 2 is a side elevation thereof; Figure 3 is a front elevation of the lower parts thereof; and Figure 4 is a section on line AA of Figure 1; Figure 1 shows a view of the underside of a wok 10 having on its underside an electric heating element 11. The electric heating element

S

e

*S

*0 *5

S

I~

consists of a first portion 12 which extends over the central area only of the wok and is terminated in connectors 13, a probe tunnel 14 being arranged in the position shown.

The heating element 11 has a second portion 15 which extends circumferentially over an area of the curved surface of the wok at a distance from the center corresponding to the area in which food may be cooked. It is considered that a suitable diameter for the outer portion 15 of the heating element is of the order of 23cm. As may be seen from Figure 1 the portion of the heating element is continuous with the portion 12. It is preferred that the cross-section of the heating element should be D-shaped as seen in Figure 4, the flat surface lying against the surface of the wok.

The body of the wok 10 is formed from aluminium sheet which is pressed to the shape shown in Figure 2 and the heating element 11 is secured to the outer surface of the wok by brazing. It is to be noted that it is essential that the brazing metal should make close contact both with the metal of the wok and with the heating element so that heat is conducted effectively from the heating element to the body of the wok.

A wok made from cast aluminium will have an appearance similar to the wok shown in Figure 1, the heating element in this case being set in a groove formed on the underside of the wok, the heatinig element being held in position by staking.

It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly claimed. The present embodiments are, therefore, to be ~considered in all respects as illustrative and not restrictive.

Claims

1. A wok having an electric heating element a first portion of which extends in the area of the underside of the central portion of the wok and a second portion, continuous with the first portion, which extends circumferentially on the underside of the wok in a substantially part circular path extending over curved portions of the wok surrounding the central portion, the heating element being secured to the outer surface of the wok; wherein the heating element is terminated in a pair of adjacent connectors, the first portion of the element defining opposed generally "C"-shaped portions substantially symmetrically disposed about a plane passing midway between the connectors and through the centre of the wok, each of the generally "C"-shaped portions then bending in an opposite sense to the curve of the "C"-shape to join with the second portion, said second portion also being substantially symmetrically disposed about the plane. 0 15

2. A wok as claimed in claim 1 wherein the wok is made of pressed sheet O. aluminium and the heating element is secured to the wok by brazing. OSS*

3. A wok as claimed in claim 1 wherein the wok is made from cast aluminium and the heating element is attached to the wok by staking in grooves cast on the outer surface of the wok.

4. A wok as claimed in claim 2 wherein the heating element is of a D- shaped cross-section, the flat surface thereof lying against the outer surface of the wok. 0000 00•

5. A wok substantially as described with reference to and as shown in the accompanying drawings. Dated this twenty second day of February 1999 00 0 BREVILLE PTY LTD Patent Attorneys for the Applicant: F B RICE CO