• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    lO ll ABSTRACT The invention relates to a device (10) in a rack oven (1) for adjusting the mutualheight between a support (2) comprising horizontal heat preserving plates (3) and abread carrying rack (4) of breads, Which device comprises a first connection point(13) for connection to the heat preserving support (2) inside the oven (1); a firstdriving arrangement (1 1) for regulating the height of the first connection point (13)and the heat preserving plates (3) of said support from a first, passive position to asecond, active position. A second driving arrangement (12) including a secondconnection point (14) for connection to the bread carrying rack is arranged to adjustthe height of the second connection point (14) With respect to the first connectionpoint (13) in order to adjust the height between the horizontal heat preservingplates (3) of the support (2) and the bread carrying rack (4). (Elected for publication: Fig. 4)
    公开号:SE1150412A1
    申请号:SE1150412
    申请日:2011-05-10
    公开日:2012-11-11
    发明作者:Anton Galjaard；Tom Halve
    申请人:Revent Int Ab；
    IPC主号:
    专利说明:

    lODEVICE FOR ADJUSTING THE HEIGHT OF A RACK IN A RACK OVENTECHNICAL FIELDThe invention relates to a device in a rack oven for adjusting the mutual heightbetween a support that comprises horizontal heat preserving plates and a breadcarrying rack. The invention also relates to a rack oven comprising such a device.
    BACKGROUNDThere are several types of ovens, Which all presents individual advantages. lntraditional stone ovens, such as e.g. pizza ovens, the bread is placed on a hot stonebase. The hot stone heats the bread from below at the same time as the hot airinside the oven heats the upper circumference of the bread. In conventional rackovens the bread is instead placed on plates that are held by a rack, which is to beinserted into a so called rack oven.
    A major advantage of a rack oven is that the amount of manual involvement isminimised, because a large quantity of bread may be put in and out of the oven inone single operation. Further, it is energy saving With respect to a stone oven,because a lot of heat is lost as the oven door is continuously open and closed in aconventional stone oven.
    There are however advantages of a conventional stone oven that are difficult toaccomplish by a rack oven. For example some types of bread need to be heated frombelow in order to obtain the right richness or consistency.
    BE 1 013 806 discloses a baking oven comprising heat preserving plates arrangedat a distance, one above the other. A rack of baking plates, which are arranged atthe same distance from each other, may then be inserted into the oven, such thateach bread carrying plate will be located above a heat preserving plate. The bakingoven includes an arrangement for raising the heat preserving plates such that thedistance between the heat preserving plates and the baking plates may be adjustedand such that contact may be made there between.
    The arrangement in BE 1 013 806 does not provide the possibility of adapting thecontact level in the breads and the heat preserving plates, because the breads arelocated on baking plates. Further, a problem with the arrangement in BE 1 013 806is that it will be almost impossible to obtain a uniform heat in the oven.
    SUMMARYAn object of the invention is to provide an improved rack oven without some of thedrawbacks of the prior art.
    According to a first aspect the invention relates to a device in a rack oven foradjusting the mutual height between a support comprising horizontal heatlOpreserving plates and a bread carrying rack, which device comprises a firstconnection point for connection to the heat preserving support inside the oven; afirst driving arrangement for regulating the heíght of the first connection point andthe heat preserving plates of said support from a first, passive position to a second,active position. Further, a second driving arrangement including a secondconnection point for connection to the bread carrying rack is arranged, Wherein thesecond driving arrangement is arranged to adjust the height of the secondconnection point With respect to the first connection point and thereby to adjust theheíght between the horizontal heat preserving plates of the support and the breadcarrying rack.
    According to a second aspect the invention relates to a rack oven comprising such adevice.
    The device and the oven comprising the device according to the invention provide animproved rack oven With respect to existing prior art ovens. A first advantageresides in that the oven provides the possibility of obtaining a uniform heat in thewhole of the oven and for all the different levels of bread in the rack oven, becauseboth the rack and the support may be lifted. Further, the oven presents thepossibility of adapting the distance between the suspended bread pieces and theheat preserving plates located inside the oven. These features present a very goodpossibility of adapting the baking procedure to any desired condition, While at thesame time presenting the possibility of obtaining predictable and repeatableconditions for consecutive baking operations.
    Preferred embodiments of the invention and its advantages will be apparent fromthe detailed description and the dependent claims.
    SHORT DESCRIPTION OF THE DRAWINGSThe invention, and further objects and advantages of it, is best understood from thefollowing description with reference to the appended drawings, of which:Fig. l is a schematic side view of an embodiment of the invention in a passiveposition,Fig. 2 is a schematic side view of the embodiment of fig. 1 in an active position,Fig. 3 is a schematic front view of an embodiment of the invention in a passiveposition,Fig. 4 is a detailed side view of an embodiment of the device according to theinvention in a passive position,Fig. 5 is a detailed side view of an embodiment of the device according to theinvention in a active position, andFig. 6 is a top view of an embodiment of the device according to the invention.
    DETAILED DESCRIPTIONThe invention relates to a device 10 for adjusting the height of a bread carrying rackin a rack oven 1. In fig. 1 an embodiment of such a device lO is shown. Two uprightstands are shown in the figure. The first stand is denoted a support 2. The support2 comprises a number of horizontal heat preserving plates 3, which are spacedapart from each other, preferably by equal distances. The second stand is a breadcarrying rack 4 comprising an equal number of levels of suspended pieces of bread5 carried by a flexible material 5a that is held up by bars 5b, such that the flexiblematerial 5a between two bars 5b forms a bed for holding at least on piece of bread5. The levels of bars 5b and flexible material 5a are spaced apart from each other bya distance that corresponds to the distance between the heat preserving plates 3. Infig. 1 the bread carrying rack 4 has been inserted into the support 2, such thateach level of suspended pieces of bread 5 is located above a heat preserving plate 3without touching the same.
    The device 10 is arranged to adjust the mutual height between the two stands 2and 4. ln fig.l the bread carrying rack 4 is at ground level, i.e. with the wheels 7located on the oven floor 9. This corresponds to a passive position, in which there isno contact between the suspended pieces of bread 5 and corresponding heatpreserving plates 3. The support 2 may be slightly lifted in the passive position,which is illustrated in that the wheels 6 of the support are hanging freely above theoven floor 9.
    In fig. 2 the height adjusting device 10 has been adjusted to a second, activeposition, in which both the support 2 and the rack 4 have been lifted with respectto their position in fig. 1. The support 2 has been lifted to higher degree than therack 4, such that the heat preserving plate 3 of the support 2 have been lifted intocontact with corresponding levels of suspended pieces of bread 5.
    As is visible in fig. 2, both the support 2 and the bread carrying rack 4 have beenlifted in fig. 2. Further, from the difference in height of the wheels 6 of the support 2and the wheels 7 of the bread carrying rack 4, it is apparent that the support 2 hasbeen lifted to a higher degree than the bread carrying rack 4. To achieve thisdifferentiated lifting, the height adjusting device 10 includes two separate butinterconnected driving arrangements ll and 12.
    The first driving arrangement 1 l comprises a first connection point 13 forconnection to the heat preserving support 2 and the second driving arrangement 12comprises a second connection point 14 for connection to the bread carrying rack4. The first connection point 13 for connection to the heat preserving support 2 maybe of a relatively fixed type that is not intended to be disconnected on a regularbasis. N amely, the idea of the heat preserving plates 3 is that they shall be left inthe oven such that they preserve their inherent heat between two consecutivebaking operations. However, as the oven itself may be an all-round rack oven, itmay of course be of interest to withdraw the heat preserving support 2 at timeswhen they are not needed in the current baking operation. Hence, the firstconnection point 13 may be a relatively fixed connection e.g. including screws. ltmay however also include some kind of Snap attachment. Either Way, there are anumber of connection means known to the skilled person, which may be easilyimplemented in the inventive system. The invention is not limited to a specific typeof connection means.
    The second connection point 14 is preferably of a type that is more easilyinterconnectable to the bread carrying rack 4. From fig. 3 it is apparent that theshown embodiment of the connection point 14 is comprised of two interspacedhooks into which a horizontal bar 8 of the bread carrying rack 4 Will fitautomatically as the rack is introduced into the oven 1. ln fig. 1 only one hook isvisible, whereas in fig. 3 both hooks that constitute the second connection point 14are visible. ln the shown embodiment the hooks include a gap, into which thehorizontal bar 8 of the rack 4 fits easily. The gap of the second connection point 14includes an allowance such that different racks 4 of slightly different height may fitinside it.
    In figs. 1 and 3 there is a gap below the horizontal bar 8 with respect to the hooksof the connection point 14. In fig. 2 on the other hand, the gap below the bar 14 hasbeen reduced to zero, such that the horizontal bar rests on the hooks of the secondconnection point 14. The rack 4 is lifted in the horizontal bar 8 in said connectionpoint 14 into an active position where the rack 4 hangs freely in the air. In thisposition there is instead a gap above the horizontal bar 8 With respect the hooks ofthe connection point 14.
    From fig. 2 it is further apparent, e.g. by comparing the height of the pieces of bread5 to the heat preserving plates 3, that the support 2 has been lifted to a higherdegree than the rack 4. The difference in lifted height mainly corresponds to theinitial gap below the horizontal bar 8 with respect the hooks of the connection point14. This is due to the fact that the first driving arrangement ll lifts both of theconnection points 13 and 14 simultaneously and to the same degree. Hence, theheight difference comes from the fact that the rack 4 is not lifted until the secondconnection point 14 has been raised into contact With the horizontal bar 8 of therack 4. However, as will be described below, part of the height difference alsocorresponds to the action of the second driving arrangement. The function of thefirst and second driving arrangements ll and 12 will be described in detail belowwith reference to figs. 4-6.
    In the shown embodiment the first and second driving arrangement 11 and 12 arearranged in the upper side of the oven and are connected to the inside of the ovenvia shafts 25 and 26. The shafts 25 and 26 are arranged such that they extendthrough the insulation 29 of the oven 1.ln fig. 4 the height adjusting device 10 is positioned in the passive positioncorresponding to the position shown in figl. Fig. 5 is sectional view of the heightadjusting device 10, in which the device is shown in the active positioncorresponding to the position shown in fig. 2. The first driving arrangement ll isarranged to move the rack 4 and support 2 between the active and passive position,whereas the second driving arrangement 12 is arranged to fine adjust the positionlOof the suspended pieces of bread 5 With respect to the heat preserving plates 3 inthe active position.
    As is apparent from fig. 4 the passive position offers a gap between the pieces ofbread 5 and the heat preserving plates 3. This gap is useful as it allows the rack 4to be moved in and out of the oven unhindered. It may be important that the gap issufficiently big in order to prevent that the material 5a that holds the pieces ofbread 5 touches the plates 3. Even the slightest contact may namely lead to thatthe material is held back, such that breads will be misshaped, e. g. not symmetrícalin their cross sectional view.
    The first driving arrangement 11 comprises a first actuator 15 (see fig. 6), which isarranged to rotate a cam shaft 21, which in turn is arranged to slide inside a cam22. ln fig. 4 the cam shaft 21 is in a lower position, whereas in fig. 5 it has beenrotated 90° to an upper position. The cam house 23 that includes the cam 22 isprevented from rotating by screws 24, which are shown in fig. 5. Further, the camshaft 21 is connected to an outer lifting shaft 25. The connection of the carn shaft21 to the outer lifting shaft 25 includes an axial bearing 28 that allows the camshaft 21 to rotate with respect to the outer lifting shaft 25, but that hinders anyaxial, i.e. vertical, movement there between. Hence, as the cam shaft 2 1 is rotatedin the cam 22 and is forced to move vertically as a function of the profile of the cam,the outer lifting shaft 25 will move along with it in the vertical direction.
    As is visible in figs. 4 and 5 the outer lifting shaft 25 is connected to the firstconnection point 13. The second connection point 14 is, on the other hand,connected to an inner lifting shaft 26, which is located inside the outer lifting shaft25. Both the outer and the inner lifting shaft 25, 26 are affected by the movement ofthe first driving arrangement 11. The first driving arrangement 1 1 does however notaffect the mutual relation between the outer and the inner lifting shafts 25, 26. Thismutual relation is instead governed by the second driving arrangement 12.
    The second driving arrangement 12 comprises a second actuator 16, Which isarranged to affect the mutual relation between the outer and the inner lifting shafts25, 26 in order to adjust the grip arm constituting the second connection point 14to different functional positions.
    The inner shaft 26 is arranged to slide inside the outer shaft 25, wherein a first,lower end of the inner shaft 26 comprises the second connection point 14. Theupper end of the inner shaft 26 is connected to and driven by the second drivingarrangement 12, which drives the inner shaft 26 with respect to the outer shaft 25.
    The second driving arrangement 12 comprises two opposed angled frames 32 and33. In fig. 6 it is apparent that an inner frame 32 is located inside an outer frame33, and that the second actuator 16 is arranged inside the outer frame 33 with afirst end 16a attached to the inside of the outer frame 33 and with a secondopposite end 16b attached to the outside of the inner frame 32. Hence, when thesecond actuator 16 is extended, the inner frame 32 is pushed to the left L (in theview represented in fig. 6) at the same time as the outer frame 33 is pushed to thelOright R. In other Words the frames are pushed in opposite directions by the action ofthe actuator.
    In fig. 4 the second driving arrangement 12 is illustrated in its lowest position, i.e.With the upper bearing 35 supported by the straight parts 32a, 33a of the inner andouter frame 32, 33, respectively. In this position the actuator 34 is fully retracted.In fig. 5, on the other hand, the actuator 34 has been extracted, such that thefrarnes 32 and 33 have been pushed apart, Wherein the upper bearing 35 has beenslightly raised With respect to a lower bearing 36 and rests on the sloping parts 32b,33b of the of the inner and outer frame 32, 33, respectively. The upper bearing 35 isconnected to the inner shaft 26, and the lower bearing 36 is connected to the outershaft 25. Hence any movement of the upper bearing 35 With respect to the lowerbearing 36 implies a movement of the inner shaft 26 With respect to the outer shaft25. Therefore, as the shafts 25, 26 are connected to different connection points 13,14 any movement of the second actuator 16 Will imply mutual movement of theconnection points and hence of the support 2 and the rack 4.
    As indicated above the second driving arrangement 12 offers the possibility to fineadjust the position of the rack 4 With respect to the support 2, in order to achieve adesired contact surface between the pieces of bread 5 and the heat preservingplates 3. The adjustment of the second driving arrangement 12 may be performedbefore every single baking operation. HoWever, an advantage of the presentedembodiment of the invention is that it is not necessary to adjust the second drivingarrangement 12 between consecutive baking operations if a Well functioning degreeof contact has been established between the pieces of bread 5 and the heatpreserving plates 3.
    As is visible in figures 1 and 2, the shape of the second connection point 14 allowsfor a certain level of freedom for the adjustment of the second driving arrangement12 With respect to the horizontal bar 8 of the rack 4. Namely, the gap of theconnection point 14 corresponds to the possible position of the second drivingarrangement 12 in such a Way that the horizontal bar 8 Will fit inside the secondconnection point 14 regardless of the position of the actuator of the second drivingarrangement 12. Hence, the rack 4 may be inserted into and Withdrawn from thesecond connection point 14 regardless of the position of the second drivingarrangement 12. On the other hand it may only be Withdrawn from the oven Whenthe first driving arrangement is in its lower position, such that the Wheels 7 of therack Will be in contact With the oven floor. If different racks 4 of different height areused in the oven 1, the racks may be furnished With an identity code, such as e.g.an RFID, a bar code, or the like. Such an identity code Would make it possible toeasily identify all racks and to individually adjust the second driving arrangement12 to a predetermined height. The individual adjustment could be achieved bymeans of a processor connected to said driving arrangement.
    The second driving arrangement 12 is connected to the fixed cam house 23 of thefirst driving arrangement 11 via a link arm 37. The link arm 37 keeps the seconddriving arrangement 13 from rotating.
    Two embodiments of the first driving arrangement 12 are shown in fig. 6. Thesemay be used regardless of each other and normally only one of them is part of thearrangement. The first embodiment of the first driving arrangement 12 includes afirst actuator 15, which is arranged to rotate the cam shaft 21. In fig. 6 the actuator15 is in its most retracted position, in which the cam shaft 21 is located in thelowest part of the cam 22, corresponding to the position shown fig. 4. When theactuator 15 is extended the actuator arm 17 will act on the extension 20 of the camshaft 21. Typically, the cam shaft 21 is rotated a quarter of a revolution, i.e. 90°,such that the extension 20 of the cam shaft 21 will point downwards in fig. 4.
    In the second embodiment of the first driving arrangement 12 the extension 20 ofthe cam shaft 21 is governed by the opening and closing of the oven door 18. Adowel 19 is arranged on the door and connected to the cam shaft extension 20 viaan arm 27. The position and angle of the dowel 19 is adapted such that a desiredrotation of the cam shaft 21 is achieved by a full opening of the oven door 18. Inaddition, a weight compensation arrangement may be provided. The support 2,including the heat preserving plates 3 is relatively heavy, such that it is difficult tolift it by hand power by closing the door. A weight compensation arrangement couldeven out the weight of the support 2 and reduce the power needed to lift it to asuitable level. No weight compensation arrangement is shown in the figures. lt ishowever obvious to a skilled person to implement such a system, such that adetailed representation of it may be omitted in this description.ln fig. 6 a rotational driving arrangement 40 is shown. The driving arrangement 40includes a motor 41 that drives a driving wheel 42 that is connected via an endlessbelt 43 to drive a second wheel 44, which is fixedly connected to the outer shaft 25.Hence the rotational driving arrangement 40 drives the outer shaft 25. As has beenindicated above the first and second driving arrangements 1 1, 12 are arranged tothe shafts 25 and 26, respectively, in a manner that allows the shafts to rotate.
    The first drive arrangement 1 1 is connected to the outer shaft 25 via the cam shaft21, which is arranged to the outer shaft via an axial bearing 28 that allows theouter shaft 25 to rotate with respect to the cam shaft 21 (c.f. fig. 5). The seconddrive arrangement 12 is connected to the inner shaft 26 via an upper axial bearing35 and to the outer shaft 25 via a lower axial hearing 36. Hence, the second drivearrangement 12 is also connected to the shafts 25, 26 in a way that allows theshafts 25, 26 to rotate.
    Preferably, the inner shaft 26 and the outer shaft 25 are interconnected such theywill rotate together. This interconnection may consist of a track and projectionbetween the shafts 25, 26 or any other type of conventional arrangement forpreventing mutual rotation between two coaxial shafts.
    Hence, by means of the driving arrangement 40 it is possible to make both theconnection points rotate jointly. This is a great advantage as it means that thesupport 2 and the rack 4 may rotate together during a baking operation. This isadvantageous since is it almost impossible to obtain an even heat inside a rackoven, and that otherwise the pieces of bread would not be evenly heated. ThislOproblem is solved by the rotation of the rack and support, as it implies that thepieces of bread will be moved around inside the oven and thereby passes throughthe zones of somewhat different temperature at regular intervals. Such interrnittentheating is not a problem compared to the problem of a static temperaturedifference.
    In one not shown embodiment the cam 22 may include a depression into which thecam shaft 21 may be fitted in order to lower the support 2 all the way down to theoven floor 9. This position is useful if the support 2 shall be connected to orreleased from the first connection point 13. The position does however not need tobe used between two consecutive baking operations if the support is to be used inboth of these operations.
    Above, the invention has been described with reference to specific embodiments. It is,however, obvious to a person skilled in the art that other embodiments may be usedto achieve the same result within the scope of the invention. Hence, the invention isnot limited by these embodiments; instead it is only limited by the appended claims.
    权利要求:
    Claims (9)
    [1] 1. A device (10) in a rack oven (1) for adjusting the mutual height between asupport (2) comprising horizontal heat preserving plates (3) and a bread carryingrack (4), Which device (10) comprises a first connection point (13) for connection tothe heat preserving support (2) inside the oven (1); a first driving arrangement (11)for regulating the height of the first connection point (13) and the heat preservingplates (3) of said support (2) from a first, passive position to a second, activeposition, characterised in a second driving arrangement (12) including a secondconnection point (14) for connection to the bread carrying rack (4), wherein thesecond driving arrangement (12) is arranged to adjust the height of the secondconnection point (14) with respect to the first connection point (13) in order toadjust the height between the horizontal heat preserving plates (3) of the support (2)and the bread carrying rack (4).
    [2] 2. The device according to claim 1, wherein an arrangernent (40) is arranged torotate both the first connection point (13) and the second connection point ( 14) Withrespect to the inside of the oven, such that the rack (4) and the support (2) will berotated together.
    [3] 3. The device according to claim 1 or 2, wherein the first driving arrangement (11)is connected to the opening of a door (18) of the rack oven, such that the firstconnection point (13) is in the passive position when the door (18) is fully open andis lifted to the elevated active position when the door is closed.
    [4] 4. The device according to claim 1 or 2, wherein the first driving arrangement (11)comprises a first actuator (15), which is arranged to drive the first connection point(13) between the passive position and the elevated active position.
    [5] 5. The device according to any of the preceding claims, wherein the first drivingarrangement (1 1) is arranged to adjust the height of both the first connection point(13) and the second connection point (14).
    [6] 6. The device according to claim 5, which device comprises a two part shaft (25,26) comprising an outer shaft (25) and an inner shaft (26) which is arranged to slidewith respect to and inside the outer shaft (25), wherein the first drivingarrangement (1 1) is arranged to adjust the height of both the outer shaft (25) andthe inner shaft (26), the outer shaft (25) being connected to the first connectionpoint (13), and wherein the second driving arrangement (12) is arranged to adjustthe height of the inner shaft (26) with respect to the outer shaft (25), the inner shaft(26) being connected to the second connection point (14).
    [7] 7. The device according to claim 6, wherein the first driving arrangement (1 1)includes a first actuator (15) that drives a cam shaft (21) inside an axial cam (22),and Wherein the cam shaft (21) is connected to the outer shaft (25) via an axial bearing (28), such that it is free to rotate With respect to the outer shaft (25) but isrestricted from axial movement With respect to it.
    [8] 8. The device according to claim 7, wherein the second driving arrangement (12)includes a second actuator (16) which is located between an inner frame (32) andan outer frame (33), and Wherein the frames (32, 33) separates an upper bearing(35) from a lower bearing (36), the upper bearing (35) being connected to the innershaft (26) and the lower bearing (36) being connected to the outer shaft (25), andWherein the frames (32, 33) comprises a sloping upper part (32b, 33b), which Whenthe frames are parted from each other by the extension of the actuator forces theupper bearing (35) further away from a lower bearing (36), such that the inner shaft(25) is elevated with respect to the outer shaft (26) and such that the secondconnection point (14) is elevated with respect to the first connection point (13).
    [9] 9. A baking oven arranged to house a bread carrying rack (4) and a support (2)comprising horizontal heat preserving plates (3), characterised in that it comprisesa device according to any of the preceding claims.
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    同族专利:
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    SE537266C2|2015-03-17|
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    US20140083308A1|2014-03-27|
    WO2012152876A2|2012-11-15|
    US9526255B2|2016-12-27|
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    WO2012152876A3|2013-01-03|
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    JP6018181B2|2016-11-02|
    引用文献:
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    FR2956949B1|2010-03-04|2013-04-19|Pelle Equipements|COOKING DEVICE FOR FOOD PRODUCTS BASED ON PASTE AND COOKING FILET.|US20160095468A1|2014-10-02|2016-04-07|Paul J. Storiz|Food holding apparatus and method|
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    CN106308617B|2016-11-18|2018-11-06|嘉兴市新飞腾塑业有限公司|A kind of Household food baking box installation hoisting frame|
    CN112586520A|2020-12-14|2021-04-02|阜阳市鑫禾粮园食品有限公司|Baking equipment is used in cake production|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150412A|SE537266C2|2011-05-10|2011-05-10|Device for adjusting the height of a carrier in an oven|SE1150412A| SE537266C2|2011-05-10|2011-05-10|Device for adjusting the height of a carrier in an oven|
    PCT/EP2012/058665| WO2012152876A2|2011-05-10|2012-05-10|Device for adjusting the height of a rack in a rack oven|
    US14/116,490| US9526255B2|2011-05-10|2012-05-10|Device for adjusting the height of a rack in a rack oven|
    JP2014509735A| JP6018181B2|2011-05-10|2012-05-10|Equipment for adjusting the height of the rack in the rack oven|
    EP12723411.0A| EP2706858B1|2011-05-10|2012-05-10|Device for adjusting the height of a rack in a rack oven|
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