Food or edible material: processes – compositions – and products – Processes – Heating above ambient temperature
Patent
1997-07-29
1999-05-25
Yeung, George
Food or edible material: processes, compositions, and products
Processes
Heating above ambient temperature
99443R, 99479, 126 41A, 426496, 432138, 432142, 432162, 432239, A21D 800, F27B 900
Patent
active
059068558
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the baking of products in a baking oven, more particularly an oven of the kind in which the products are supported by at least one rotary oven trolley.
DESCRIPTION OF THE BACKGROUND ART
It is known, and generally common practice, to bake bread, buns, etc., in an oven wherein the bread, buns, etc., are supported in tiers on oven plates or oven sheets carried by an oven trolley which can be moved into and out of the oven. The trolley can be connected to floor-mounted or ceiling-mounted drive means for rotating the trolley slowly about its vertical centre axis. The trolley is rotated to obtain more uniform baking of the product, therewith obtaining a product of better quality than would otherwise be the case.
A baking oven of this kind is known from SE 395 595 and EP 112 786. When the trolley is to be removed from the oven, The rotational direction of the trolley is reversed so as to lower or lift the trolley in the process of removing the same. The trolley rotates in one direction during the actual baking process.
SUMMARY OF THE INVENTION
An object of the present invention is to improve still further the baking result in ovens provided with rotary trolleys. This object is achieved with the inventive method and inventive arrangement having the characteristic features set forth in the characterizing clauses of respective independent claims.
This reversal of the direction of trolley rotation further improves the evenness to which the product is baked. In the aforesaid patent publications, reversal of trolley rotation is effected during the baking process and is not effected with the aim of obtaining an improved baking result as a result of such reversal.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a baking oven provided with an arrangement according to the present invention;
FIG. 2 illustrates the oven in FIG. 1 from above;
FIG. 3 is a longitudinal sectioned view of the oven shown in FIG. 1, taken on the line III--III; and
FIG. 4 is a cross-sectional view of the oven shown in FIG. 1, taken on the line IV--IV.
DESCRIPTION OF PREFERRED EMBODIMENTS
There is shown a baking oven 1 which has two side walls 2 and 3, a back wall 4, a front wall 5, a door 6 fitted to the front wall, a roof 7 and a bottom 8. All parts 2-7 are heat insulated. The oven 1 further includes a ceiling 9, an inner wall 10, and two perforated inner walls 11 and 12. Mounted in the spaces between the walls 3, 12 and 10, 11 is a respective steam pack 13 and 14 which function to moisten the air within the oven, with hot steam. Mounted in the space between the oven roof 7 and the inner wall 9 is a fan 15 which forces the air in the oven 1 to flow in the paths illustrated by arrows in FIG. 1. A heat pack 16 for heating oven air is mounted between the side wall 2 and the inner wall 10. Connections to respective steam packs 13, 14, fan 15 and heat pack 16 have not been shown in the drawings since they are not required in obtaining an understanding of the invention. This also applies to ventilation openings.
An oven trolley 17 having wheels 18 that can also be rotated in the horizontal plane is shown inserted into the oven. The oven trolley 17 includes a frame which supports a plurality of baking sheets 19. FIG. 3 shows buns B placed on sheets 19. Mounted centrally in the upper part of the trolley 17 is a suspension roller 21. The roller 21 can be hooked onto a hook 20 which is connected to a shaft 22 that extends through the roof 7 and there connected to an electric motor 23 through the medium of a belt pulley 22a, which is fixedly mounted on the shaft 22, a toothed belt 24, a gear housing 25, and a toothed belt 26.
The motor 23 is reversible and is connected to a pulse counter 27 which counts the number of revolutions made by the motor 23 and when reaching a predetermined number of revolutions sends a pulse to the motor 23 and therewith cause the motor to rotate in the opposite. The pulse counter 27 is therewith set to zero and again begins to count the number of revolutions m
REFERENCES:
patent: 4162141 (1979-07-01), West
patent: 4202259 (1980-05-01), Johansson
patent: 4375354 (1983-03-01), Henriksson
patent: 4619607 (1986-10-01), Schroder
Larsson Lennart
Persson Jonas
Sveba-Dahlen AB
Yeung George
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