AU674687B2

AU674687B2 - Electric toaster

Info

Publication number: AU674687B2
Application number: AU44335/93A
Authority: AU
Inventors: John William Mcclean
Original assignee: Breville Pty Ltd
Current assignee: Breville Pty Ltd
Priority date: 1992-08-25
Filing date: 1993-07-29
Publication date: 1997-01-09
Anticipated expiration: 2013-07-29
Also published as: AU4433593A

Description

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AUSTRALIA

Patents Act 1990 BREVILLE R D PTY LTD

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT Invention Title: ELECTRIC TOASTER The following statement is a full description of this invention including the best method of performing it known to me:- The present invention relates to electric toasters and more particularly to electric toasters in which the article, for example, a slice of bread, to be toasted is inserted through a slot in the top of the toaster to lie between two heating elementr which when energised toast both sides of the slice at the same time. Such toasters are normally equipped with electromechanical means that act to raise or eject the slice of bread and switch off the toaster once the toasting operation has been completed. Such toasters are for this reason commonly known as "pop-up" toasters and for convenience this term will be used in this specification.

While millions of such toasters are in use and generally prove satisfactory there have been a not insignificant number of cases in which fires have been caused by the article being toasted becoming jambed, for one reason or another, in the toaster with the result that the electrical supply to the heating elements is not switched off automatically and the toaster commences first of all, to char and thereafter, to ignite the article being toasted with the production of a considerable amount of flame. In some cases, where a toaster has been placed beneath the bottom of a window curtain, the flames have set light to the curtain and caused a seriousconflagration.

The object of the present invention is to provide a means for protecting against the occurrence of such fires.

The present invention consists in a pop-up toaster including means that prior to the toasting operation can be caused to extend over the slot of the toaster, such means consisting of a piece of wire gauze or expanded metal which while permitting the escape of heated air from the interior of the toaster acts as a barrier to a flame produced by combustion of material in the toaster.

-3- In order that the nature of the invention may be better understood, preferred forms thereof are hereinafter described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of one form of the invention including a manually operated wire mesh baffle; Figure 2 is a perspective view of the toaster shown in Figure 1 in which the wire mesh baffle is raised for the insertion and removal of toasted material; Figure 3 is a perspective view of part of the toaster of Figure 1 showing possible additional constructional features Figure 4 is a plan view of another form of the invention; Figure 5 is a cross-sectional view of the toaster shown in Figure 4 showing the arrangement of parts during the insertion of a slice of bread; and Figure 6 is a view similar to Figure 5 showing the configuration of the parts of the toaster during toasting.

~20 Figures 1, 2 illustrate one embodiment of the invention in which a pop-up toaster 10 of generally conventional construction which is provided with a hingedly attached wire mesh baffle 11. For inserting or removing a slice of bread 12 the baffle 11 is hinged 25 upwardly as shown in Figure 2 by hand. During toasting the baffle 11 is lowered to the position shown in Figure 1. The baffle 11 consists of a frame 13 that carries a S. wire mesh member 14 and is hingedly attached to the body of the toaster.

30 In the modified arrangement shown in Figure 3 the frame 13 is supported by a stay 15 connected to the conventional toast carriage which is depressed by an external lever 15c. When the carriage is depressed the stay 15 automatically closes the frame 13 to bring it to the position shown in Figure 1. When toasting is -4completed the toast carriage rises under the action of an internal spring and acts through the stay 15 to hinge the frame 13 to the position shown.

As is it not possible to pack the toaster in the configuration shown in Figure 3 it is necessary to make the stay 15 capable of detachment from the frame 13 and be able to fold from the broken line position 15a to the position 15b. When first sold the toaster includes a message 16 instructing a user to engage the stay 15 with the frame 13 before using the toaster. This is removed and discarded after being read.

Experiments have shown that with such an arrangement if a fire occurs within the toaster flames cannot escape through the wire mesh. The principles involved in this are well known and are exhibited by the classic "Davy" lamp.

In Figures 4, 5 and 6 is shown a further form of ":construction of a pop-up toaster incorporating the invention. The toaster consists of a casing 20 having in 20 its upper surface a slot 21 through which material to be toasted, such as the slice of bread 22, shown in Figure 5. The toaster contains a conventional mechanism for lowering the bread 22 so as to lie between the heater elements 23 and 24. This is controlled by the lever Iq 25 (Fig. The toaster also includes conventional electromechanical devices controlling the "pop-up" function of the toaster which, for clarity have been omitted. At each side of the interior of the casing 20 is an arm 25 hinged at point 26 and outwardly spring loaded.

S: 30 These arms carry at their upper ends pieces of metal wire mesh adapted to act as flame baffles 27 and 28 which normally assume the position shown in Figure 5 thus leaving the slot 21 and the area beneath it clear for the insertion of an article to be toasted. If, however, the slice of bread 22 is lowered by depressing the lever 25 to take up position shown in Figure 6 the metal wire mesh flame baffles 27 and 28 are brought to a position in which they overlap on the center line of the toaster and completely close off the area above the slice of bread 22 being toasted. Once the normal toasting operation has finished the arms 25 are automatically restored to the position shown in Figure 5 and the piece of toast produced is elevated to the position shown in that figure.

The effect of the arrangement is to prevent any flames from combustion of material in the toaster from extending upwardly above the level of the metal wire flame baffles. These baffles may be made not only from wire mesh but from a variety of other materials that are capable of withstanding the temperature involved, allow the escape of heat and air during toasting that are effective to prevent passage of flame through them.

It is to be understood that the embodiments of the invention described and illustrated are given by way of example only as constituting particular forms of the S: 20 invention as defined broadly above.

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Claims

2. A pop-up toaster as claimed in claim 1 wherein the said means consist of a sheet of wire gauze or expanded metal or the like mounted in a frame so as to overly the slot of the toaster, the frame being hinged to the body of the toaster and being capable of being moved manually to a position in which it overlies the slot of the toaster or in which it stands upright at one side of the slot of the toaster.
3. A pop-up toaster as claimed in claim 2 having a toaster carraige wherein the frame is connected by means of a stay to the toaster carriage whereby the frame is moved between the said positions as the toaster carriage is raised or lowered.
4. A pop-up toaster as claimed in claim 3 wherein one 99 a end of the stay is detachably connected to the frame and the other end is pivotally connected to the toaster carriage whereby it may be moved to lie parallel to the top of the toaster for packing.
5. A pop-up toaster as claimed in claim 1 having a 30 toaster carriage wherein there are included within a .9 casing enclosing the toaster a pair of arms :hat extend upwardly in the casing, the lower ends of the arms being hingedly connected to the casing and outwardly urged by spring means, there being at the upper end of 35 each arm portions of metal wire mesh adapted to extend across the slot of the toaster to act as flame baffles 7 being provided whereby when the toaster carriage is lowered the arms are caused to pivot inwardly bringing the wire mesh members in a position overlying an item of foodstuff being toasted, the arms being returned to their first described position on the toaster carriage rising.
6. A pop-up toaster substantially as described with reference to and as illustrated in Figures 1 and 2 or Figure 3 or Figures 4, 5 and 6 of the accompanying drawings. DATED this 29th day of July 1993 BREVILLE R D PTY LTD Patent Attorneys for the Applicant: F.B. RICE CO. e .*qI 6 r 4 k 4 I ABSTRACT A pop-up toaster having a member of wire gauze or expanded metal of the like that prior to the toasting operation can be caused to extend over the slot of the toaster and which, while permitting the scope of heated air from the interior of the toaster, acts as a barrier to a flame produced by combustion of material in the toaster. t4 c t