Food storage cabinet with tray cover

Abstract

The utility model discloses a food storage cabinet with a tray cover, which comprises a cabinet body, at least one heating chamber is arranged in the cabinet body, at least one tray is arranged on a bottom plate of the heating chamber, the front end and / or the rear end of the heating chamber are / is open, and the food storage cabinet further comprises the tray cover positioned above the tray. Supporting structures are arranged on the left side and the right side of the tray cover in the heating chamber, a limiting assembly for limiting the tray cover to move outwards is arranged on the inner wall of the heating chamber, or a stopping structure for limiting the tray cover to be separated from the supporting structures forwards or backwards is arranged on the tray cover; in a natural state, the tray cover is lapped or hung on the supporting structure, and the distance from the bottom surface or the abutting surface of the tray cover to the bottom plate of the heating chamber is smaller than the height of the tray; when the tray is placed in the heating chamber, the tray pushes the tray cover to move upwards, so that the tray cover covers the top of the tray; when the tray is moved out, the tray cover slides downwards under the action of gravity and is overlapped or hung on the supporting structure again.

Description

Technical Field

[0001] This utility model relates to the field of food cabinet technology, and in particular to a food storage cabinet with a tray cover. Background Technology

[0002] Food storage cabinets are widely used in catering, food processing, and home environments to store cooked or semi-cooked foods and maintain them at a high temperature through a heating chamber. However, the tray design of existing food storage cabinets has certain shortcomings, affecting the food's heat retention and ease of use.

[0003] Most food storage cabinets on the market currently use a trayless, lidless design. This makes the food in the trays prone to rapid heat and moisture loss during storage, affecting its taste. Additionally, hot foods from different trays can easily cross-contaminate flavors, reducing their quality. To address these issues, some food storage cabinets are equipped with tray lids, but this design still presents operational inconveniences. Users must remove the tray lid along with the tray, or remove the lid first and then remove the tray, increasing the steps and reducing efficiency.

[0004] Therefore, there is still room for optimization in the tray structure of existing food storage cabinets. There is an urgent need for an improved solution that can effectively maintain the temperature and humidity of food while improving operational convenience to meet actual usage needs. Utility Model Content

[0005] The purpose of this utility model is to provide a food storage cabinet with a tray cover. The tray cover automatically moves up to cover the top of the tray when it is placed in and automatically falls down when it is removed, forming a real-time seal on the tray and effectively reducing heat loss and moisture evaporation.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] A food storage cabinet with a tray cover includes a cabinet body, at least one heating chamber inside the cabinet body, at least one tray on the bottom plate of the heating chamber, the front and / or rear ends of the heating chamber being open, and a tray cover located above the tray. Support structures are provided on the left and right sides of the tray cover inside the heating chamber, and a limiting component is provided on the inner wall of the heating chamber to restrict the tray cover from moving outward, or a stop structure is provided on the tray cover to restrict the tray cover from moving forward or backward away from the support structure.

[0008] In its natural state, the tray cover overlaps or hangs on the support structure, and the distance from the bottom surface or contact surface of the tray cover to the bottom plate of the heating chamber is less than the height of the tray.

[0009] When the tray is placed into the heating chamber, the tray pushes the tray cover upwards, so that the tray cover covers the top of the tray; when the tray is removed, the tray cover slides down under the influence of gravity and is re-attached or suspended on the support structure.

[0010] Preferably, the support structure includes multiple positioning pins extending to the left and right, and the left and right sides of the tray cover are respectively provided with multiple first slides with longitudinal components. The positioning pins pass through the first slides to form a slidable connection. When the tray is placed in and taken out, the tray cover moves up or down through the sliding cooperation between the first slides and the positioning pins.

[0011] Preferably, the lower part of the first slide is connected to a horizontally extending second slide, and the second slide is connected to a third slide, which extends upward to the edge of the tray cover to form an opening groove; by moving the tray cover laterally, the positioning pin passes through the first slide, the second slide and the third slide in sequence and then comes out of the opening groove, thereby removing the tray cover from the heating chamber.

[0012] Preferably, a vertically extending fourth slide is provided on the second slide, or a horizontally extending fourth slide is provided on the first slide. The longitudinal distance of the fourth slide is less than the longitudinal distance of the first slide. When the positioning pin slides into the fourth slide, the distance from the bottom surface or abutment surface of the tray cover to the bottom plate of the heating chamber is greater than the height of the tray.

[0013] Preferably, the tray cover includes a cover body and a first folded edge extending vertically upward or downward on the left and right sides of the cover body, and the first slide, the second slide, the third slide and the fourth slide are all provided on the first folded edge.

[0014] Preferably, the junctions of the first slide, the second slide, the third slide, and the fourth slide are all provided with arc transition sections.

[0015] Preferably, the positioning pin includes a pin body and an end coaxially arranged, the end of the pin body away from the end is fixedly connected to the inner wall of the heating chamber, the pin body passes through the first slide rail, and the diameter of the end is greater than the width of the first slide rail.

[0016] Preferably, the support structure includes a transverse connecting part, a longitudinally extending pin, and a limiting member located at the lower part of the pin. The transverse connecting part is fixedly connected to the inner wall of the heating chamber. The tray cover has a through hole extending vertically. The pin passes through the through hole. The radial dimension of the limiting member is larger than the diameter of the through hole, which is used to prevent the tray cover from disengaging downward from the pin.

[0017] Preferably, the support structure includes a laterally extending slide rail, the tray cover overlaps the slide rail, the limiting component is an elastic buckle provided at the front end and / or rear end of the tray cover, and the inner wall of the heating chamber is provided with a guide groove that cooperates with the elastic buckle. When the tray cover moves, the elastic buckle is engaged in the guide groove and extends out of the guide groove in its natural state to limit the tray cover.

[0018] A food storage cabinet with a tray cover includes a cabinet body, at least one heating chamber inside the cabinet body, at least one tray on the bottom plate of the heating chamber, the front end and / or rear end of the heating chamber being open, and a tray cover located above the tray. A plurality of longitudinally extending guide rods are fixedly connected to the inner top of the heating chamber. The tray cover has a plurality of slots for the guide rods to pass through, the guide rods passing through the slots to form a slidable connection, and a stop member is provided at the lower end of the guide rod to prevent the tray cover from detaching from the guide rod.

[0019] In its natural state, the tray cover is suspended on the stop, and the distance from the bottom surface or contact surface of the tray cover to the bottom plate of the heating chamber is less than the height of the tray.

[0020] When the tray is placed into the heating chamber, the tray pushes the tray cover upward along the guide rod, so that the tray cover covers the top of the tray; when the tray is removed, the tray cover slides down under the action of gravity and is resuspended on the stop.

[0021] Compared with the prior art, the advantages of this utility model are:

[0022] 1. The tray lid features a dynamic structure that automatically rises to cover the top of the tray when it is placed in and automatically falls back down when it is removed, creating a real-time seal that effectively reduces heat loss and moisture evaporation. Experiments show that compared to traditional open-top storage cabinets, this solution can reduce heat loss by 30%-50% and extend food preservation time by 20%-40%. Simultaneously, the design of the tray lid completely covering the tray isolates odors from food in different trays, preventing cross-contamination and reducing the entry of external dust or contaminants, thus improving food hygiene and safety.

[0023] 2. The support structure achieves vertical movement and lateral fixation of the tray cover through the sliding fit of the positioning pin and the slide rail, the limiting fit of the pin and the through hole, or the guiding and limiting of the slide rail and the elastic buckle. This ensures smooth lifting when the tray is pushed in and automatic reset when it is removed. No additional human intervention is required for operation, and the user experience is significantly optimized.

[0024] 3. The multi-segment design of the slide (first slide, second slide, third slide, and opening groove) allows the tray cover to be dislodged from the locating pin for easy cleaning or replacement; the rounded transition at the intersection of the slides reduces sliding friction, lowers wear on parts, and extends service life. The fourth slide allows the tray cover to be raised to a clearance height, creating unobstructed access space. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the food storage cabinet with a tray cover in this utility model;

[0027] Figure 2 This is a cross-sectional view of the food storage cabinet with a tray lid according to this utility model. Figure 1 ;

[0028] Figure 3 This is a cross-sectional view of the food storage cabinet with a tray lid according to this utility model. Figure 2 ;

[0029] Figure 4 for Figure 3 Enlarged structural diagram at point C;

[0030] Figure 5 This is a schematic diagram of the tray cover structure in Example 1;

[0031] Figure 6 This is an enlarged structural diagram of section B of the tray cover in Example 1;

[0032] Figure 7 This is a cross-sectional view of the food storage cabinet with a tray lid according to this utility model. Figure 3 ;

[0033] Figure 8 This is a schematic diagram of the structure of a certain type of tray cover.

[0034] In the diagram: 1. Cabinet; 2. Heating chamber; 21. Guide groove; 22. Base plate; 3. Tray; 31. Handle; 4. Tray cover; 41. Cover body; 411. Slot; 42. First folded edge; 421. Weight-reducing opening; 422. Second folded edge; 44. Grip part; 45. First slide rail; 46. Second slide rail; 47. Third slide rail; 48. Opening groove; 49. Fourth slide rail; 5. Positioning pin; 51. Pin body; 52. End; 53. Pin shaft; 54. Limiting component; 55. Guide rod; 56. Stop component; 57. Lateral connection part; 6. Slide rail; 7. Limiting assembly. Detailed Implementation

[0035] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0036] Example 1

[0037] A food storage cabinet with a tray lid, such as Figure 1-6 As shown, the cabinet includes a cabinet body 1, which contains two heating chambers 2 distributed vertically. The front and rear ends of the heating chambers 2 are open. In other food storage cabinets, there may be one or more heating chambers 2. The heating chambers 2 may be open at the front or rear end. One or two trays 3 of equal height are placed on the bottom plate 22 of each heating chamber 2. In this embodiment, a tray 3 is placed on the bottom plate 22 of the heating chamber 2, and the top of the tray 3 is covered with a tray cover 4.

[0038] The tray cover 4 includes a cover body 41. The left and right sides of the cover body 41 have first flanges 42 extending vertically upwards or downwards. The front and rear parts of the first flanges 42 have longitudinally extending first slide rails 45. Four positioning pins 5, serving as a support structure, pass through the first slide rails 45 to form a slidable connection, allowing the tray cover 4 to be suspended on the inner wall of the heating chamber 2. Specifically, the positioning pins 5 extend horizontally left and right, and the tray cover 4 is suspended on the left and right inner walls of the heating chamber 2. In its natural state, the distance from the bottom surface of the tray cover 4 to the bottom plate 22 of the heating chamber 2 is slightly less than the height of the tray 3. Alternatively, the cover body 41 of the tray cover 4 may only extend downwards on the left and right sides, meaning the distance from the lower end of the first flange 42 to the bottom plate 22 of the heating chamber 2 is less than the height of the tray 3. Or, the center of the cover body 41 may be concave upwards, forming an abutment surface against the tray 3 around its perimeter, with the distance from the abutment surface to the bottom plate 22 of the heating chamber 2 less than the height of the tray 3.

[0039] When tray 3 is placed into heating chamber 2, the handle 31 of tray 3 is held to push tray cover 4 upward. After tray 3 is in place, tray cover 4 automatically covers tray 3, preventing the food in tray 3 from losing heat and moisture too quickly. When there are multiple trays 3 under tray cover 4, it also prevents the food in different trays 3 from mixing flavors. When tray 3 is removed from heating chamber 2, tray cover 4 slides down under gravity through the sliding engagement of first slide 45 and positioning pin 5. After the top of first slide 45 contacts positioning pin 5, tray cover 4 stops sliding and returns to its natural position, that is, it is reattached or suspended on positioning pin 5.

[0040] To facilitate the removal of the tray cover 4 from the positioning pin 5 and its removal from the heating chamber 2, second slide rails 46 extend horizontally forward from the bottom of the four first slide rails 45. In another embodiment, the second slide rails 46 can also be formed by extending horizontally backward from the bottom of the first slide rails 45. A third slide rail 47 extends vertically upward from the second slide rail 46, and an opening groove 48 is provided at the top edge of the first folded edge 42. The third slide rail 47 and the top opening groove 48 are connected. For easy installation, the positioning pin 5 includes a pin body 51 and an end 52. Both the pin body 51 and the end 52 are cylindrical. The end of the pin body 51 is threaded and connected to the inner wall of the heating chamber 2. The end 52 is integrally formed with the pin body 51. The end of the end 52 away from the pin body 51 has an internal hexagonal or cross groove for fixing or removing the positioning pin 5; or the end 52 is a nut that is threadedly connected to the pin body 51. The widths of the first slide rail 45, the second slide rail 46, and the third slide rail 47 are greater than the diameter of the pin body 51 but less than the diameter of the end 52. The opening groove 48 is larger than the diameter of the end 52. When the tray cover 4 is taken out from the heating chamber 2, the tray cover 4 is pushed forcefully so that the positioning pin 5 slides along the second slide rail 46 into the third slide rail 47. The tray cover 4 falls due to gravity, and the top opening groove 48 disengages from the end 52 of the positioning pin 5. The tray cover 4 can then be taken out from the open end of the heating chamber 2.

[0041] To ensure that the tray cover 4 remains suspended within the heating chamber 2 without hindering the removal and placement of the tray 3, a fourth vertically extending slide 49 is provided on the second slide 46 of the tray cover 4. This fourth slide 49 is located between the first slide 45 and the third slide 47, or on the side of the first slide 45 away from the third slide 47, or on the side of the third slide 47 away from the first slide, or the fourth slide 49 connects with the first slide 45 and extends horizontally. When the tray cover 4 is moved so that the positioning pin 5 is positioned within the fourth slide 49, the tray cover 4 is suspended within the heating chamber, and the height from the bottom surface of the tray cover 4 to the bottom plate 22 of the heating chamber 2 is greater than the height of the tray 3, allowing the tray 3 to be placed or removed horizontally without resistance.

[0042] To ensure smooth sliding of the tray cover 4 during use, the junctions of the first slide rail 45, the second slide rail 46, the third slide rail 47, and the fourth slide rail 49 are all rounded, allowing the locating pin 5 to pass smoothly through the junctions. Since the locating pin 5 can only slide out from the top opening slot 48 of the third slide rail 47, the inner walls of the first slide rail 45, the third slide rail 47, and the fourth slide rail 49 on the open side of the heating chamber 2 can all act as stop structures during use, preventing the tray cover 4 from moving to the open side and disengaging from the locating pin 5.

[0043] The tray cover 4 has gripping parts 44 that extend upward at an acute angle at both the front and rear ends. In other embodiments where only one end of the heating chamber 2 is open, the tray cover 4 has gripping parts 44 that extend upward at an acute angle at the open end, making it convenient for the tray cover 4 to be put into or taken out of the heating chamber 2.

[0044] To reduce the overall weight of the tray cover 4 and facilitate its use, a weight-reducing opening 421 is provided on the first folded edge 42 of the tray cover 4.

[0045] Example 2

[0046] The difference between this embodiment and Embodiment 1 is that a longitudinally extending partition plate is provided in the middle of the heating chamber 2, dividing the heating chamber 2 into two spaces, left and right, and placing at least one tray 3 in each space. In this embodiment, a tray cover 4 is provided in each of the two spaces of the same heating chamber 2. Four positioning pins 5 are used to suspend the same tray cover 4, with two positioning pins 5 fixed to the inner wall of the heating chamber 2 and the other two positioning pins 5 fixed to the partition plate, thereby suspending the tray cover 4 between the inner wall of the heating chamber 2 and the partition plate.

[0047] Example 3

[0048] The difference between this embodiment and Embodiment 1 is that, in combination with Figure 7 and 8 As shown, the support structure includes a slide rail 6 that extends laterally and is fixed to the inner wall of the heating chamber 2. The left and right sides of the tray cover 4 are respectively attached to the slide rail 6, and the tray cover 4 is restricted from moving outward by a limiting component 7 provided on the inner wall of the heating chamber 2.

[0049] The limiting component 7 is an elastic buckle located at the front end and / or rear end of the tray cover 4. The inner wall of the heating chamber 2 is provided with a guide groove 21 that cooperates with the elastic buckle. The elastic buckle includes a compression spring. The compression spring pushes the telescopic structure to protrude and limit the tray cover 4. When the tray cover 4 moves, the elastic buckle is inserted into the guide groove 21 and extends out of the guide groove 21 in its natural state to limit the tray cover 4.

[0050] Example 4

[0051] The difference between this embodiment and Embodiment 1 is that, in combination with Figure 7 and 8As shown, the support structure sequentially includes a transverse connecting part 57, a plurality of longitudinally extending pins 53, and a limiting member 54 located at the lower part of the pins 53, as shown. Figure 7 As shown, the tray cover 4 has a through hole running vertically through it. The pin 53 passes through the through hole. The radial dimension of the limiting member 54 is larger than the diameter of the through hole, which is used to limit the tray cover 4 from disengaging from the pin 53. In this embodiment, the multiple pins 53 of the support structure are located on the left and right sides of the tray cover 4, and are fixed to the inner left and right sides of the heating chamber 2 by connecting members.

[0052] Example 5

[0053] A food storage cabinet with a tray lid, combined with Figure 7 and 8 As shown, the device includes a cabinet 1, which contains at least one heating chamber 2. At least one tray 3 is provided on the bottom plate 22 of the heating chamber 2. The front and / or rear ends of the heating chamber 2 are open. A tray cover 4 is provided above the tray 3. A plurality of longitudinally extending guide rods 55 are fixedly connected to the inner top of the heating chamber 2. The tray cover 4 is provided with a plurality of slots 411 through which the guide rods 55 pass. The guide rods 55 pass through the slots 411 to form a slidable connection. A stop 56 is provided at the lower end of the guide rods 55 to prevent the tray cover 4 from detaching from the guide rods 55.

[0054] In its natural state, the tray cover 4 is suspended on the stop 56, and the distance from the bottom surface of the tray cover 4 to the bottom plate 22 of the heating chamber 2 is less than the height of the tray 3. When the tray 3 is placed into the heating chamber 2, the tray 3 pushes the tray cover 4 upward along the guide rod 55, so that the tray cover 4 covers the top of the tray 3. When the tray 3 is removed, the tray cover 4 slides down under the action of gravity and is suspended again on the stop 56.

[0055] In one embodiment, the left and right edges of the tray cover 4 have a first folded edge 42 extending upwards, and the upper end of the first folded edge 42 is laterally bent inwards to form a second folded edge 43, and the slot 411 is provided on the second folded edge 43.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A food storage cabinet with a tray cover, comprising a cabinet body (1), wherein at least one heating chamber (2) is provided inside the cabinet body (1), and at least one tray (3) is provided on the bottom plate (22) of the heating chamber (2), wherein the front end and / or rear end of the heating chamber (2) are open, characterized in that, It also includes a tray cover (4) located above the tray (3), and a support structure is provided on the left and right sides of the tray cover (4) in the heating chamber (2). A limiting component is provided on the inner wall of the heating chamber (2) to restrict the tray cover (4) from moving outward, or a stop structure is provided on the tray cover (4) to restrict the tray cover (4) from moving forward or backward from the support structure. In its natural state, the tray cover (4) overlaps or hangs on the support structure, and the distance from the bottom surface or contact surface of the tray cover (4) to the bottom plate (22) of the heating chamber (2) is less than the height of the tray (3); When the tray (3) is placed into the heating chamber (2), the tray (3) pushes the tray cover (4) upward so that the tray cover (4) covers the top of the tray (3); when the tray (3) is removed, the tray cover (4) slides down under the action of gravity and is re-attached or suspended on the support structure.

2. A food storage cabinet with a tray lid according to claim 1, characterized in that, The support structure includes multiple positioning pins (5) extending to the left and right. The left and right sides of the tray cover (4) are respectively provided with multiple first slides (45) with longitudinal components. The positioning pins (5) pass through the first slides (45) to form a slidable connection. When the tray (3) is placed in and taken out, the tray cover (4) moves up or down through the sliding cooperation between the first slides (45) and the positioning pins (5).

3. A food storage cabinet with a tray lid according to claim 2, characterized in that, The lower part of the first slide (45) is connected to the horizontally extending second slide (46), and the second slide (46) is connected to the third slide (47). The third slide (47) extends upward to the edge of the tray cover (4) to form an opening groove (48). By moving the tray cover (4) laterally, the positioning pin (5) passes through the first slide (45), the second slide (46) and the third slide (47) in sequence and then comes out of the opening groove (48), thereby realizing the removal of the tray cover (4) from the heating chamber (2).

4. A food storage cabinet with a tray lid according to claim 3, characterized in that, The second slide (46) is also provided with a vertically extending fourth slide (49), or the first slide (45) is provided with a horizontally extending fourth slide (49). The longitudinal distance of the fourth slide (49) is less than the longitudinal distance of the first slide (45). When the positioning pin (5) slides into the fourth slide (49), the distance from the bottom surface or abutment surface of the tray cover (4) to the bottom plate (22) of the heating chamber (2) is greater than the height of the tray (3).

5. A food storage cabinet with a tray lid according to claim 4, characterized in that, The tray cover (4) includes a cover body (41) and a first folded edge (42) extending vertically upward or downward on the left and right sides of the cover body (41). The first slide (45), the second slide (46), the third slide (47) and the fourth slide (49) are all provided on the first folded edge (42).

6. A food storage cabinet with a tray lid according to claim 4, characterized in that, The junctions of the first slide (45), the second slide (46), the third slide (47) and the fourth slide (49) are all provided with arc transition sections.

7. A food storage cabinet with a tray lid according to any one of claims 2-6, characterized in that, The positioning pin (5) includes a pin body (51) and an end (52) arranged coaxially. The end of the pin body (51) away from the end (52) is fixedly connected to the inner wall of the heating chamber (2). The pin body (51) passes through the first slide rail (45). The diameter of the end (52) is greater than the width of the first slide rail (45).

8. A food storage cabinet with a tray lid according to claim 1, characterized in that, The support structure includes a transverse connecting part (57), a longitudinally extending pin (53), and a limiting member (54) located at the lower part of the pin (53). The transverse connecting part (57) is fixedly connected to the inner wall of the heating chamber (2). The tray cover (4) has a through hole that runs vertically through it. The pin (53) passes through the through hole. The radial dimension of the limiting member (54) is larger than the diameter of the through hole, and it is used to restrict the tray cover (4) from disengaging from the pin (53) downward.

9. A food storage cabinet with a tray lid according to claim 1, characterized in that, The support structure includes a laterally extending slide rail (6), the tray cover (4) is attached to the slide rail (6), the limiting component (7) is an elastic buckle provided at the front end and / or rear end of the tray cover (4), the inner wall of the heating chamber (2) is provided with a guide groove (21) that cooperates with the elastic buckle, the elastic buckle is engaged in the guide groove (21) when the tray cover (4) moves, and extends out of the guide groove (21) in the natural state to limit the tray cover (4).

10. A food storage cabinet with a tray cover, comprising a cabinet body (1), wherein at least one heating chamber (2) is provided inside the cabinet body (1), and at least one tray (3) is provided on the bottom plate (22) of the heating chamber (2), wherein the front end and / or rear end of the heating chamber (2) are open, characterized in that, It also includes a tray cover (4) located above the tray (3). The inner top of the heating chamber (2) is fixedly connected with a plurality of longitudinally extending guide rods (55). The tray cover (4) is provided with a plurality of slots (411) through which the guide rods (55) pass. The guide rods (55) pass through the slots (411) to form a slidable connection. The lower end of the guide rods (55) is provided with a stop (56) to restrict the tray cover (4) from detaching from the guide rods (55). In its natural state, the tray cover (4) is suspended on the stop (56), and the distance from the bottom surface or contact surface of the tray cover (4) to the bottom plate (22) of the heating chamber (2) is less than the height of the tray (3); When the tray (3) is placed into the heating chamber (2), the tray (3) pushes the tray cover (4) to move upward along the guide rod (55) so that the tray cover (4) covers the top of the tray (3); when the tray (3) is removed, the tray cover (4) slides down under the action of gravity and is resuspended on the stop (56).

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