CN210004044U - Screen lifting mechanism - Google Patents

Abstract

The utility model relates to an screen elevating system for domestic appliance, elevating system is including the fixed curve guide way that sets up, the connecting rod system, the support piece that can linear motion ground set up, a serial communication port, connecting rod system includes 0 connecting rod and second connecting rod, this 1 connecting rod and second connecting rod are articulated in the screen respectively in 2 ends separately activity, 3 connecting rod activity is articulated in the tip of support piece, the second connecting rod is articulated in the tip of support piece in end activity in addition, make connecting rod, second connecting rod, screen and support piece form plane four-bar linkage, the connecting rod is provided with the guide piece in its end in addition, the guide piece engages the curve guide way and moves, be used for guiding connecting rod and remove along the curve guide way, utilize this kind of mechanism, easily control the flip angle of screen in the lift in-process in the design.

Description

Screen lifting mechanism

Technical Field

The utility model relates to an kind of screen elevating system and domestic appliance who has this kind of screen elevating system are for example steam ager, oven, steaming oven etc. for with parts such as domestic appliance's control screen lifting to the open position, for make things convenient for the people to touch and control the parts such as water box etc. behind the screen.

Background

At present, healthy diet is increasingly the target of life pursued by people. The steam box or the steam oven is more and more popular among consumers because the temperature of the processed food is lower than that of the oven, so that the nutrition of the food can be better kept.

Water boxes are used in steam chests or ovens to produce steam. arrangements for water boxes are placed in an external insulated space of the heating chamber, usually above the heating chamber, for ease of operation, and an operating panel (also known as a screen) is also placed above the steam chest or oven for ease of operation.

In document CN102551509B, the control panel and the water box are driven to translate out, and the water box is taken out vertically upwards. Such a scheme requires a large space outside the steam box, and the water box is inconvenient to take out vertically and upwards.

In document CN105476458A, the control panel is driven by a motor to push out two push rods fixedly connected to both sides of the panel through a screw rod, and the panel is lifted under the action of a track slot. The water box can also be pushed out at the same time.

Document CN205053739U proposes relatively simple solutions, in which the motor drives two links fixedly connected to the two sides of the screen via transverse transmission rods and achieves the lifting of the screen under the effect of the track slots.

However, the drawbacks of the solutions proposed in documents CN105476458A and CN205053739U are that when the screen is lifted, the screen always has large flip angles, which may make it inconvenient for the user to view the screen content.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving at least of aforementioned shortcoming, especially to the problem that there is inherent rotation angle all the time in the lifting of screen among the prior art, and propose neotype elevating system, utilize this elevating system for easily control the rotation angle of screen at the lift in-process in the design.

Therefore, the utility model provides a screen elevating system for domestic appliance, including the fixed curvilinear guide way that sets up, the link system, can the support piece that linear motion set up, its characterized in that, link system includes 0 link and second link, this 1 link and second link are articulated in the screen respectively in 2 ends separately activity, 3 link activity is articulated in the tip of support piece, the second link is articulated in the other end activity in the said tip of support piece, make link, second link, screen and support piece form plane four-bar linkage, and, the link is provided with the guide piece at its other end, the guide piece couples the curvilinear guide way and moves, is used for guiding connecting rod along the curvilinear guide way and moves.

If necessary, the fixedly arranged curved guide tracks, the connecting rod system and the linearly movably arranged support elements are arranged symmetrically in two groups.

Advantageously, said planar four-bar mechanism is formed by the th link, the second link, the section between the th and second links and the active hinging point of the screen, the section of the support between the th and second links and the active hinging point of the support.

Therefore, particularly by utilizing the plane four-bar mechanism, the turning angle of the screen in the lifting process is easy to control in design.

Advantageously, said planar four-bar mechanism is formed as a parallel four-bar mechanism, so that the screen remains vertically non-inverted during the raising and lowering.

Advantageously, the curved guide track is a curved guide slot and the guide element is a sliding pin or a roller, which is arranged movably in the curved guide slot.

Advantageously, the curved chute comprises, in succession, towards the screen, an upper horizontal section profile and an inclined section profile which are in communication, the inclined section profile extending obliquely downwards towards the screen.

Advantageously, the th link includes a th section disposed facing the second link and a second section extending away from the screen and at an angle relative to the th section.

Advantageously, the section of the th link is articulated at its junction with the second section to said end of the support, said guide being provided on the second section of the th link.

Advantageously, the second connecting rod is rectilinear or bent.

Advantageously, a screen support is provided on the inner surface of the screen, and the th and second links are movably hinged on the lower portion of the screen support and the th links are movably hinged on the upper portion of the screen support.

Advantageously, the curved guide track is a curved rack and the guide member is a rotatable gear.

Advantageously, the screen lifting mechanism further comprises a drive assembly connected to the support to drive the support to move linearly in a reciprocating manner.

Advantageously, the screen lifting mechanism is arranged inside the body, and the screen lifting mechanism is movably hinged to the screen.

Advantageously, the household appliance is a steam box, an oven or a steam oven.

Drawings

The above-mentioned and other features and advantages of the present invention will be apparent from the following description of embodiments according to the present invention, given in a non-limiting and illustrative manner with reference to the accompanying drawings, in which:

fig. 1 shows a schematic perspective view of a screen lifting mechanism according to an embodiment of the present invention in a closed position of a screen;

fig. 2 shows a schematic structural perspective view of a screen lifting mechanism in an open or raised position of a screen according to an embodiment of the present invention;

fig. 3 shows a partial inside view of the screen lifting mechanism in the closed position at the upper right-hand portion as shown in fig. 1, wherein the relevant components are shown in transparent view so as not to obstruct the components behind them, in order to clearly see the structure, relative positions and cooperation of the components involved, such as the linkage, the sliding pin and the sliding slot, according to an embodiment of the invention;

FIG. 4 is a view similar to FIG. 3, but with the screen in a raised position;

figure 5 shows the articulation between the link system, screen, support according to the invention;

figure 6 shows an enlarged cross-sectional detail view of the sliding engagement of the slide pin in the slide slot.

Detailed Description

In the description, various systems, structures and devices are schematically depicted in the drawings for purposes of explanation only and not all features of an actual system, structure or device, such as a well-known function or structure, are not described in detail to avoid obscuring the present invention in unnecessary detail. It will of course be appreciated that in the development of any such actual implementation, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such implementation decisions, while complex and time consuming, are nevertheless routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

directed to the terms or phrases herein are not intended to imply a special definition of the term or phrase, i.e., a definition that is different from the ordinary and customary meaning as understood by those skilled in the art, for the term or phrase that is intended to have a special meaning, i.e., a definition that is different from the meaning as understood by those skilled in the art, which special definition will be expressly set forth in the specification in a definitional manner that directly and unequivocally provides the special definition for the term or phrase.

Throughout the following specification and claims, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be interpreted in an open-ended, inclusive sense, i.e., as "including but not limited to".

Throughout the description of this specification, references to the terms " embodiments," " embodiments," " embodiments," "examples," "specific examples," or " examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least embodiments or examples of the present invention.

As used in this specification and the appended claims, the singular form of the indefinite article "" and the definite article "the" includes or more referents unless otherwise expressly specified or limited it is also noted that the term "or" includes in its sense "and/or" unless otherwise expressly specified or limited, for the purposes of this specification, a phrase in the form of "A or B" means "(A), (B) or (A and B)". for the purposes of this specification, a phrase in the form of "A, B or at least of C" means "(A), (B), (C), (A and B), (A and C), (B and C) or (A, B and C)".

Thus, a feature defined as "", "second", etc. may explicitly or implicitly include or more of that feature.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "coupled," "connected," "secured," and the like shall be construed , for example, as being fixedly connected, detachably connected, or physically connected, mechanically connected, directly connected, indirectly connected through an intermediary, and communicating between two elements.

Embodiments according to the present invention will be described below with reference to the accompanying drawings.

Fig. 1 and 2 show schematic perspective structural views of a screen lifting mechanism according to an embodiment of the present invention in a closed position and an open position of a screen, also known as a lifting position, respectively.

Such a screen lifting mechanism is particularly applied to household appliances such as a steam box, an oven, a steam oven and the like, and the steam oven is taken as an example to be explained below. The lifting mechanism is used for horizontally pushing out components such as a control screen of the steaming oven or a control panel from a closing position in a linear mode and then lifting the components to an opening position, so that a user can take out the components such as a water box placed on the rear side of the screen and in a containing cavity in the steaming oven body through an opening of the steaming oven body or put the water box into the cavity. And when the screen is reset by the lifting mechanism, the screen closes the opening of the body, and the water tank is sealed in the cavity of the body. The cavity of the toaster body for receiving the water tank is generally disposed above the toasting chamber for receiving the food items, separated from the toasting chamber by a thermally insulating support plate. Although the steaming oven equipped with such a screen lifting mechanism is not shown in the drawings, the above-described structure and operation thereof are well known. This will not be described in detail here.

The screen lifting mechanism according to the invention shown in fig. 1-2 is arranged in the aforementioned chamber for accommodating a water tank, the lifting mechanism comprises a chute support provided with a curved chute 4, a link system 5, or a support 6, and a motor drive assembly 9 two sets of chute 4 support, link system 5, and support 6 may be arranged symmetrically on both sides of the chamber of the water tank, the following description of the chute 4 support, link system 5, and support 6, mainly on the side , applies equally to the chute 4 support, link system 5, and support 6 on the other side .

Referring to the drawings, particularly to fig. 3-4, curved sliding chutes 4 in the sliding chute supports sequentially comprise an upper horizontal section contour 17 and an inclined section contour 18 which are communicated towards the screen direction, the upper horizontal section contour 17 extends backwards along the horizontal direction, namely away from the screen 1 and towards the rear of the body, the inclined section contour 18 forms an angle of relative to the upper horizontal section contour and extends forwards and downwards towards the screen 1, and the inclined section contour 18 is respectively used for linear horizontal extending and retracting movement and vertical lifting movement of the screen through a connecting rod system 5.

link systems 5 are arranged on the left and right sides of the chamber, said link systems 5 comprising two links, called th link and second link, here lower links 3 and upper links 2, which upper links 2 and lower links 3 are movably hinged at their respective front ends, i.e. ends adjacent to the screen 1, respectively, exactly to the left or right side of the inner surface, i.e. the surface facing the chamber, of the screen 1. as shown in fig. 1-2, on the left and right sides of the inner surface of the screen 1, there are screen support frames 20, said screen support frames 20 having a panel support fixed against the inner surface of the screen and a coupling substantially perpendicular to the panel support frame for connection with the links, here the upper links 2 and the lower links 3 are movably hinged to the upper and lower screen support frames 20 at movable hinge points 21 and 22, respectively, however, as a variant, the positions of the aforementioned links 2 and the aforementioned links 3 may be reversed, i.e. the links 2 are movably hinged to the upper screen support frames.

As shown in fig. 1-5, the upper link 2 is here preferably rectilinear, and the lower link 3 comprises an -th section 31 facing and parallel to the upper link 2, and a second section 32 extending at an angle on the rear side, i.e. away from the screen, relative to the -the junction between the -th section 31 and the second section 32 forming a bend, as indicated by reference numeral 10 in the figures-in the closed position, as is particularly clear from fig. 3 and 5, the upper link 2 extends horizontally, the -th section 31 of the lower link 3 likewise extends horizontally, and the second section 32 extends obliquely upwards and rearwards.

Preferably, the straight upper link 2 is substantially the same length as the th section 31 of the lower link 3, as measured from right to left in the plane of fig. 3 and 5, also referred to as from rear to front, although the length may be different if desired, and further, as shown in fig. 3-5, the second section 32 of the lower link 3, i.e., the lower link 3, is provided with a slide pin 16 at the rear end remote from the screen 1, the slide pin 16 being slidingly engaged within a fixed curvilinear slide slot 4, slidable between a extreme high position a shown in fig. 3, and a second extreme low position B shown in fig. 4, the extreme high position a shown in fig. 3 being substantially at the upper rear end of the upper horizontal section profile 17 of the slide slot, corresponding to the closed position of the screen, the second extreme low position B shown in fig. 4 being substantially at the lower front end of the diagonal section profile 18 of the slide slot, corresponding to the open/raised position of the screen, the slide pin 16 at the rear end of the second section 32 being shifted from the extreme high position a to the second extreme high position B, as shown in fig. 2, the closed position of the screen, as shown in fig. 3, and as shown in fig. 4.

An enlarged detail cross-sectional view of such a sliding pin 16 engagement in the sliding groove 4 at the rear end of the lower link 3 is shown particularly schematically in fig. 6.

Of course, the slide pin may be replaced with a roller. Alternatively, it is also conceivable to replace the aforementioned sliding bolt 16 and sliding groove 4 with a matching gear and rack. This is easy to achieve. Whether a sliding chute or a rack, they in fact constitute a curved guide, while the sliding pin or roller cooperating with the curved sliding chute, and the gear cooperating with the curved rack, constitute a guide for guiding the movement of the connecting rod along the curved guide.

The support member 6, here in the form of an elongated, horizontally extending, sheet metal part, is slidably arranged in a rail 8 fixed to the aforementioned support plate, which part, although referred to herein as a support member, in fact has a multiple role in that it is articulated movably to the upper and lower links 2, 3, as described above, or , which is a link member of a planar four-bar mechanism according to the invention, as described below, and which is additionally connected to the motor drive assembly via a rack to be driven in a translational movement, which in turn drives the linkage system and the screen in motion, in particular, as shown in fig. 1-2, the support member 6 is fixedly connected to the rack 7 at , so that the support member 6 is driven in a reciprocating linear movement along the rail 8 by means of the rack 7 which is coupled in meshing engagement with the motor drive assembly 9, where the support member 6 and the rack 7 are separate parts, it is also possible, as a variant, to arrange the support member 6 and the rack 7 as a -piece.

The upper link 2 is articulated, at its opposite end, i.e. the rear end, to the upper part of the front end of the support 6, and the lower link 3, more precisely its section 31, is articulated, at its junction with the second section, to the lower part of the front end of the support 6, as shown in figures 3-5, the articulation point between the upper link 2 and the support 6 is indicated with 23, and the articulation point between the lower link 3 and the support 6 is indicated with 10.

It should be noted that although the front end of the support member 6 is shown as projecting upwardly relative to the main body of the support member, it is formed in a substantially right-angled trapezoidal shape. This is not limiting and any suitable shape of the nose portion is contemplated.

The section of the front end of the support 6 between the movable hinge point 23 and the movable hinge point 10 is designated 23-10, while the sections between the movable hinge point 21 of the upper link 2 and the support frame 20 and the movable hinge point 22 of the lower link 3 and the support frame 20 are designated 21-22. preferably, the sections 23-10 are parallel to and approximately the same length as the sections 21-22. more preferably, the length of the th sections 31 of the upper link 2 and the lower link 3 is approximately the same. the upper link 2, the lower link 3, the screen 1 and the support 6 form planar four-bar mechanisms. specifically, the upper link 2, the lower link 3, the screen 1 and the support 6 form said planar four-bar mechanisms between the four movable hinge points 20, 21, 23 and 10. in this preferred embodiment, more specifically, the upper link 2, the section 31 and the two sections 23-10, 21-22 form a planar four-bar mechanism, preferably parallel four-bar mechanisms, as shown in fig. 1-5. for this preferred embodiment, as will be described later, it will be realized that the screen lifting can be carried out more conveniently during the lifting and the lifting of the screen can occur during the lifting process, i.e.g. that can occur more conveniently in the prior art.

Of course, the upper link 2, the th section 31 and the two sections 23-10, 21-22 do not necessarily have to constitute a parallel four-bar linkage, but can be designed according to practical requirements such that the non-parallel planar four-bar linkage they constitute, for example, enables the screen to be kept at a smaller flip angle in lifting than in the prior art, which is achieved with the cooperating arrangement of the curved chute 4 and the support 6, the linkage 5, etc. according to the invention.

It should be further noted that although the upper link 2 is preferably rectilinear as described above, this is not essential, but the upper link 2 may also be of a bent shape, as long as planar four-bar linkages, in particular parallel four-bar linkages, are formed between the four movable hinge points 20, 21, 23 and 10. in the case of the bent shape of the upper link, for example, the upper link 2 has a main section parallel to the -th section 31 of the lower link 3, and has on both sides two side sub-sections extending respectively forward and upward and rearward with respect to the main section, which are movably hinged to the screen and the support, respectively.

Furthermore, the screen support 20 is also given here by way of non-limiting example. Other embodiments are possible as long as they allow the upper and lower links to be articulated movably on the inner surface of the screen, forming a planar four-bar mechanism, even a parallel four-bar mechanism, as described above.

In addition, the drawing exemplarily shows embodiments of the driving assembly 9, the driving assembly 9 is a motor driving assembly here, as shown in fig. 1-2, the motor driving assembly comprises motor 15, left gear box 11, right gear box 14, left racks, same right racks 12 symmetrically arranged with the left racks, and transmission shaft 13, the left rack 7 and the right rack 12, namely the racks as mentioned above, are respectively fixedly connected with aforementioned supporting members 6.

When the motor 15 is operated, the gears in the gear box 14 are driven to rotate, and power is transmitted to the opposite left gear box 11 through the transmission shaft 13, so that the driving gears in the right gear box 14 and the left gear box 11 synchronously rotate, and the right rack 12 and the left rack 7 meshed with the corresponding driving gears are driven to do linear motion, the right rack 12 and the left rack 7 are respectively connected with the together with the supporting pieces 6 on the left side and the right side, and therefore the supporting pieces 6 are driven to do linear motion back and forth along the track 8.

It will of course be appreciated that the drive assembly is not limited to the motor drive assembly illustrated and in fact numerous devices are known which are capable of achieving linear drive. In other words, any drive means that can achieve a linear reciprocating movement of the support member 6 on the rail 8 is suitable for the present invention. In view of the fact that the driving assembly is not the utility model of the solution of the present invention, it is not repeated.

The following describes how the screen 1 is moved by means of the screen lifting mechanism according to the invention in order to open or close the chamber containing the water tank.

When the user wishes to open the chamber, for example to take out the water tank therein, he activates motor 15, for example by means of a function key on the screen or otherwise, which then rotates in a forward direction, causing support 6 to be driven by drive assembly 9 in a rectilinear motion from back to front along track 8 as previously described, lower link 3 is articulated, in its junction with second section 32 of section 31, movably to the front end of support 6, and is engaged, in the closed position, slidingly in horizontal section profile 17 of curved chute 4 by means of sliding pin 16 at the rear end of second section 32, support 6 then carries link system 5 in motion.

During this movement, first in a stage , the lower link 3 is moved linearly outwards, i.e. forwards, by the support 6 under the action of the horizontal section contour 17, and the upper link 2 and the screen 3 connected to the upper and lower links are moved linearly outwards jointly, so that the screen is pushed out horizontally, and then in a stage , the self-sliding pin 16 enters the inclined section contour 18 from the horizontal section contour 17, and under the action of the inclined section contour 18, the lower link 3, and accordingly the upper link 2 , are pushed out horizontally, and further , are lifted upwards, so that the screen 1 articulated movably with the upper and lower links is also lifted.

At the same time as the th section 31, the upper link 2 and the screen 1 are lifted upwards, as previously described, the screen can be lifted upwards at a controlled flip angle due to the th section 31 of the upper link 2 and the lower link 3 being movably hinged from the screen 1 to and from being movably hinged from the support 6 to , thus constituting planar four-bar mechanisms, in the case of the planar four-bar mechanisms constituted as described above being parallel four-bar mechanisms as shown in fig. 1-5, the screen 1 is in fact kept vertically lifted, i.e. it does not flip during the lifting upwards, so that the screen 1 is positioned vertically when it reaches the lifted position, facing the user, facilitating the user to view and/or operate the screen.

Even if the planar four-bar mechanism is not a preferred parallel four-bar mechanism, with this planar four-bar mechanism, by designing the relative lengths, relative angles, and the like of the constituent links of the planar four-bar mechanism, it is easy to control the flip angle when the screen is lifted upward, for example, to make the flip angle of the screen smaller than that of the related art. Of course, by using the plane four-bar mechanism of the utility model, the turning angle of the screen can be larger than that of the prior art when needed. This may be determined by the actual requirements.

Conversely, when the screen in the raised position is to be closed to close the chamber opening, the screen-lifting mechanism proceeds in the reverse order of the opening movement described above. Briefly, when the user starts the motor 15 to rotate the motor in the opposite direction, so that the support member 6 is driven by the motor 15 to move linearly along the rail 8 backwards, i.e. away from the screen 1, towards the back of the steaming and baking box body, the link mechanism 5, which is movably hinged to the support member 6, and accordingly the screen 1, which is movably hinged to the link mechanism, first descend under the action of the inclined section profile 18 of the chute, and then retract into the chamber under the action of the horizontal section profile 17 until the screen completely closes the chamber opening, so that the screen is in its closed position as shown in fig. 1, 3 and 5.

It is reminded that in the variant in which the link 2 is located lower and the link 3 is located lower, the same applies, in other words, the link 3 located upper is also slidingly engaged by its sliding pin 16 in the curved slide slot 4 of as described previously, and the movement of the screen between the closed position and the raised position is effected in a similar manner by incorporating a planar four-bar mechanism, in particular a parallel four-bar mechanism, formed between the respective movable articulation points of the link 2 located lower and the link 3 located upper to the screen and of their respective movable articulation points to the support 6.

In addition, the lifting mechanism according to the present invention, although preferably applicable and applied to a steam-and-roast type home appliance, is not restrictive. This is applicable to any device intended to similarly raise or lower a member at a controlled angle. Thus, the term "screen" is also understood here to mean any part which is to be raised and lowered with or without a tilting angle.

It should be noted that the specific embodiments disclosed above are merely exemplary. The present invention may include any feature or combination of features disclosed herein either implicitly or explicitly or any generalisation thereof and not limited to any restricted scope of the above list. Any of the elements, features and/or structural arrangements described herein may be combined in any suitable manner.

As the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. For example, the above method steps may be performed in a different order. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the invention. Accordingly, the protection sought herein is as set forth in the claims below.

Claims (10)

1. Screen lifting mechanism for household appliances, comprising a fixed curve guide way, a link system (5), a support member (6) which can be set in a straight line movement way, characterized in that, link systems (5) comprise a 0 link (3) and a second link (2), the 1 link and the second link are respectively articulated with the screen (1) in a movable way at the 2 end, the 3 link (3) is articulated with the end of the support member (6) in a movable way, the second link (2) is articulated with the end of the support member (6) in a movable way at the end, so that the link, the second link, the screen and the support member form a plane four-bar mechanism, and the link (3) is provided with a guide member at the end, the guide member is coupled with the curve guide way to move, so as to guide the link (3) to move along the curve guide way.
2. 2. A screen lifting mechanism according to claim 1, characterised in that the planar four-bar mechanism is formed as a parallel four-bar mechanism, so that the screen (1) remains vertically non-inverted during lifting.
3. 3. Screen lifting mechanism according to claim 1 or 2, characterized in that the curved guide is a curved chute (4) and the guide is a sliding pin (16) or a roller, which is movably arranged in the curved chute.
4. 4. A screen lifting mechanism as defined in claim 3, characterised in that the curved chute (4) comprises, in succession, towards the screen, an upper horizontal section contour (17) and an oblique section contour (18) which are in communication, the oblique section contour extending obliquely downwards towards the screen.
5. 5. Screen lifting mechanism according to claim 1 or 2, characterized in that the th link (3) comprises a th section (31) arranged facing the second link (2) and a second section (32) extending away from the screen and at an angle to the th section.
6. 6. Screen-lifting mechanism according to claim 5, characterized in that the segment of the th link is hinged articulated at its junction with the second segment to the end of the support (6), the guide being provided on the second segment of the th link.
7. 7. Screen lifting mechanism according to claim 1 or 2, characterized in that the second link (2) is straight or bent.
8. 8. A screen lifting mechanism as claimed in claim 1 or 2, wherein a screen support frame (20) is provided on the inner surface of the screen, and the th connecting rod (3) and of the second connecting rod (2) are movably hinged on the lower part of the screen support frame and the other connecting rods are movably hinged on the upper part of the screen support frame.
9. 9. A screen lifting mechanism as claimed in claim 1 or claim 2, wherein the curved guide is a curved rack and the guide is a rotatable gear.
10. 10. The screen lifting mechanism according to claim 1 or 2, further comprising a drive assembly (9) connected to the support (6) for driving the support (6) in a reciprocating linear motion.

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