Pull-out lifting mechanism and drawers, freezers

Abstract

This invention provides a pull-out lifting mechanism and a drawer / refrigerator. The lifting mechanism includes: a slide rail assembly, comprising a first slide rail and a second slide rail slidably fitted to the first slide rail; and a lifting component that carries the object to be lifted. The lifting component includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to a first hinge portion of the first slide rail, and one end of the second connecting rod is hinged to a second hinge portion of the second slide rail. The other ends of the first and second connecting rods are hinged to each other to form a third hinge portion, which is connected to the object to be lifted. Based on the technical solution of this invention, the design of the slide rail structure and the connecting rod lifting structure enables the lifting of the corresponding object by pulling out the slide rail structure. This solves the problem that storage structures such as drawers cannot be adjusted vertically, causing users to have to bend over to use them.

Description

Technical Field

[0001] This invention relates to the field of pull-out mechanism technology, and particularly to a pull-out lifting mechanism and a drawer / refrigerator. Background Technology

[0002] Many furniture and home appliances now feature pull-out storage structures, such as drawers. These drawers are often located in different parts of the furniture or appliance, which results in different user experiences when using pull-out storage structures in different locations.

[0003] For example, the prior art disclosed in CN103900319A is a freezer that, in order to solve the problem that the freezer is too deep and users cannot easily reach the stored items at the bottom, has a drawer-type storage structure at the bottom. However, it is obvious that the user experience when using the drawer in the freezer disclosed in the prior art is not very good, because users need to bend over or squat down; and when they need to clean the drawer or find certain items, users need to bend over or squat down for a long time, making the user experience particularly bad.

[0004] The fundamental problem with the existing technology is that its pull-out structure can only change the position of the corresponding storage structure in the horizontal direction, while adjusting the position in the vertical direction. Therefore, to address this problem, this invention proposes a pull-out lifting mechanism and drawers / refrigerators that can raise the height while pulling out, avoiding the problem of users having to bend over or squat for extended periods. Summary of the Invention

[0005] To address the problem that existing pull-out storage structures cannot be adjusted vertically, requiring users to bend over or squat to use them, resulting in a poor user experience, this invention proposes a pull-out lifting mechanism, drawer, and freezer.

[0006] In a first aspect, the present invention provides a pull-out lifting mechanism, comprising:

[0007] A slide rail assembly, comprising a first slide rail and a second slide rail slidably engaged with the first slide rail; and

[0008] A lifting assembly, which carries an object to be lifted, includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to a first hinge portion of a first slide rail, and one end of the second connecting rod is hinged to a second hinge portion of the second slide rail. The other ends of the first and second connecting rods are hinged together to form a third hinge portion, which is connected to the object to be lifted.

[0009] When the first slide rail and the second slide rail are retracted relative to each other, the first hinge and the second hinge are close to each other, and the first link and the second link are in a folded-down state under the gravity of the object being lifted.

[0010] When the first slide rail and the second slide rail slide relative to each other in a direction away from each other, the first hinge and the second hinge move away from each other and drive the first connecting rod and the second connecting rod to rotate in an upright direction, so that the position of the third hinge is raised.

[0011] In one embodiment, when the first link and the second link are in a folded-down state, the height of the third hinge portion is higher than that of the first hinge portion and / or the second hinge portion.

[0012] In one embodiment, when the first slide rail and the second slide rail slide relative to each other in a direction away from each other to the end of their travel, the third hinge portion is positioned horizontally between the first hinge portion and the second hinge portion.

[0013] In one embodiment, the lifting assembly further includes a third link, one end of which is hinged together with the ends of the first link and the second link to form the third hinge portion, and the other end of the third link is hinged to a fourth hinge portion of the object being lifted.

[0014] In one embodiment, the slide rail assembly further includes a fixed rail disposed on the side wall of the storage cavity accommodating the object to be lifted, and the first slide rail is engaged with the fixed rail and is slidable relative to the fixed rail to move the object to be lifted out of the storage cavity.

[0015] In one embodiment, the side of the fixed rail is further provided with a side plate, the side plate having a groove extending along the length direction of the fixed rail, and the side of the second slide rail extending out a positioning pin that is slidably engaged in the groove.

[0016] The side plate is provided with a locking mechanism at the position corresponding to the end of the slide groove. The locking mechanism is used to lock the position of the positioning pin in the slide groove. When the positioning pin is in the locking mechanism, the first slide rail slides relative to the fixed rail in a direction away from each other to the end of the stroke.

[0017] In one embodiment, the locking mechanism includes:

[0018] A first locking member, hinged to the side plate, is connected to a first elastic member. The edge of the first locking member also has a locking groove and a snap-fit ​​groove. When the first elastic member is in a free state, the opening of the locking groove lies on the path along which the locating pin slides along the slide groove.

[0019] A second locking element, hinged to the side plate, is connected to a second elastic element; wherein...

[0020] The first locking member can rotate under the push of the positioning pin that slides into the locking groove and deform the first elastic member so that the opening of the locking groove is misaligned with the path of the slide groove and the locking groove is engaged with the second locking member.

[0021] The second locking member, which engages with the locking groove, can prevent the first locking member from rotating in the opposite direction, and the elastic force of the second elastic member is used to maintain the engagement state between the locking groove and the second locking member.

[0022] In one embodiment, when the second slide rail slides relative to the first slide rail in a direction of proximity to each other to the end of its travel, the second slide rail or the lifted object that has descended to the initial position can press against the second locking member that engages with the locking groove to release the locking state of the second locking member.

[0023] In one embodiment, the slide rail assembly includes two slide rail assemblies, each slide rail assembly is connected to at least two lifting components, the lifting components of the two slide rail assemblies respectively support both sides of the object being lifted, and a plurality of lifting components connected to the same slide rail assembly are distributed along the track direction of the slide rail assembly.

[0024] Secondly, the present invention provides a drawer comprising the aforementioned pull-out lifting mechanism and a drawer box supported by the lifting component of the pull-out lifting mechanism.

[0025] Thirdly, the present invention provides a refrigerator that includes the aforementioned drawer and a storage cavity for accommodating the drawer.

[0026] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0027] The pull-out lifting mechanism, drawer, and freezer provided by this invention have at least the following advantages compared with the prior art:

[0028] The present invention discloses a pull-out lifting mechanism, a drawer, and a freezer. Based on the design of the slide rail structure and the linkage lifting structure, it realizes that by pulling out the slide rail structure, the linkage structure is driven to lift the corresponding object being lifted. This solves the problem that storage structures such as drawers cannot be adjusted in the vertical direction, which causes users to have to bend over to use them. Attached Figure Description

[0029] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0030] Figure 1 This shows a schematic diagram of the lifting mechanism of the present invention applied to a freezer;

[0031] Figure 2 An exploded view of the lifting mechanism of the present invention is shown;

[0032] Figure 3 The diagram shows the lifting mechanism of the present invention in the process of being pulled out (the locking mechanism is not locked);

[0033] Figure 4 Showing Figure 3 A schematic diagram of the locking mechanism in the unlocked state;

[0034] Figure 5 This diagram shows the lifting mechanism of the present invention in the process of being pulled out (the locking mechanism is locked);

[0035] Figure 6 Showing Figure 5 A schematic diagram of the locking mechanism in the locked state;

[0036] Figure 7 This diagram shows the lifting mechanism of the present invention in the state where the object to be lifted is deployed.

[0037] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0038] Figure label:

[0039] 1-Slide rail assembly, 11-First slide rail, 12-Second slide rail, 122-Positioning pin, 13-Fixed rail, 14-First hinge part, 15-Second hinge part, 16-Third hinge part, 2-Lifting assembly, 21-First connecting rod, 22-Second connecting rod, 23-Third connecting rod, 3-Side plate, 31-Slide groove, 4-Locking mechanism, 41-First locking element, 411-First elastic element, 412-Locking groove, 413-Snap-fit ​​groove, 42-Second locking element, 421-Second elastic element, 5-Lifted object, 51-Fourth hinge part. Detailed Implementation

[0040] The invention will now be further described with reference to the accompanying drawings.

[0041] An embodiment of the present invention provides a pull-out lifting mechanism, comprising:

[0042] Slide rail assembly 1, the slide rail assembly 1 includes a first slide rail 11 and a second slide rail 12 slidably engaged with the first slide rail 11; and

[0043] The lifting assembly 2 carries the object 5 to be lifted. The lifting assembly 2 includes a first connecting rod 21 and a second connecting rod 22. One end of the first connecting rod 21 is hinged to a first hinge portion 14 of a first slide rail 11, and one end of the second connecting rod 22 is hinged to a second hinge portion 15 of a second slide rail 12. The other ends of the first connecting rod 21 and the other ends of the second connecting rod 22 are hinged together to form a third hinge portion 16, which is connected to the object 5 to be lifted.

[0044] When the first slide rail 11 and the second slide rail 12 are retracted relative to each other, the first hinge part 14 and the second hinge part 15 are close to each other, and the first connecting rod 21 and the second connecting rod 22 are in a folded state under the gravity of the object being lifted 5.

[0045] When the first slide rail 11 and the second slide rail 12 slide relative to each other in a direction away from each other, the first hinge part 14 and the second hinge part 15 move away from each other and drive the first connecting rod 21 and the second connecting rod 22 to rotate in an upright direction, so that the position of the third hinge part 16 is raised.

[0046] Specifically, as shown in the attached diagram. Figure 2 As shown, the lifting mechanism of the present invention firstly includes a slide rail assembly 1 for pushing and pulling, wherein the first slide rail 11 and the second slide rail 12 in the slide rail assembly 1 can slide relative to each other; secondly, it also includes a lifting assembly 2 for lifting based on the drive of the sliding assembly, wherein one end of the first connecting rod 21 and the second connecting rod 22 in the lifting assembly 2 are respectively hinged to the first hinge portion 14 and the second hinge portion 15 of the first slide rail 11 and the second slide rail 12, and the other ends of the first connecting rod 21 and the second connecting rod 22 are hinged to each other to form a third hinge portion 16; the object to be lifted 5 is connected to the third hinge portion 16.

[0047] In the initial state, the first slide rail 11 and the second slide rail 12 are relatively closed, that is, their horizontal positions coincide with each other, as shown in the attached figure. Figure 3 and Figure 5As shown; at this time, the first hinge 14 and the second hinge 15 are in a close position to each other, and the whole can be regarded as a single hinge support point. Therefore, for the linkage mechanism of the lifting assembly 2, there is only one hinge support point, which obviously does not provide a stable support structure for the object being lifted 5. Consequently, under the gravity of the object being lifted 5, the first link 21 and the second link 22 will retract (retracting means that the included angle corresponding to the third hinge 16 approaches 0°) and will naturally fall down. The structure in the fallen state can be seen in the attached diagram. Figure 2 At this time, the third hinge 16 is in a low position, the object being lifted 5 is in an initial state where it has not been lifted, and the object being lifted 5 and the entire lifting mechanism can be accommodated in the storage cavity of the corresponding furniture or electrical appliance.

[0048] When the object to be lifted 5 needs to be raised, the first slide rail 11 or the second slide rail 12 is pulled to make them move relative to each other. As a result, the first hinge 14 and the second hinge 15 will move away from each other, and the distance between them will increase. The length of the first link 21 and the second link 22 remains unchanged. In order to adapt to the tendency of the first hinge 14 and the second hinge 15 to move away from each other, the first link 21 and the second link 22 will unfold relative to each other (unfolding means that the first link 21 and the second link 22 rotate in the upright direction and the included angle corresponding to the third hinge 16 gradually increases). At this time, the position of the third hinge 16 gradually rises, thereby driving the object to be lifted 5 to rise, thus realizing the lifting of the corresponding object to be lifted based on the relative movement of the first slide rail 11 and the second slide rail 12.

[0049] It should be noted that before the object to be lifted 5 is raised, the object to be lifted 5 needs to be moved out of the corresponding storage cavity by sliding. This can be achieved by making the slide rail assembly 1 slide relative to the sliding structure in the storage cavity.

[0050] In one embodiment, when the first link 21 and the second link 22 are in a reclined state, the height of the third hinge 16 is higher than that of the first hinge 14 and / or the second hinge 15.

[0051] Specifically, since this invention drives the lifting component 2 to move vertically using a horizontal force, it is necessary to consider the positional relationships of the corresponding structures, specifically to avoid "dead points" in the linkage mechanism. (Refer to the accompanying drawings.) Figure 2 The lifting assembly 2 is powered by the horizontal sliding of the slide rail assembly 1. Either the first slide rail 11 or the second slide rail 12 acts as the driving element. Therefore, in the lifting assembly 2, either the first link 21 or the second link 22 acts as the driving element for deployment. Therefore, refer to the attached diagram. Figure 2In the linkage structure, the first hinge 14, the second hinge 15, and the third hinge 16 cannot be at the same horizontal height, because if they are, the horizontal force will be along the length of all the links in the downed state, forming a dead point, and the linkage structure cannot be driven to rotate in the upright direction.

[0052] Therefore, the third hinge 16 needs to be positioned at a height at least higher than the first hinge 14 or the second hinge 15 when in the folded-down state. This means that at least one of the first link 21 and the second link 22 is not completely horizontal when in the folded-down state, but rather has an angled tilt, as shown in the attached diagram. Figure 2 The second link 22. Of course, the specific link that is tilted and its tilting direction also need to take into account the relative displacement direction of the first slide rail 11 and the second slide rail 12. Essentially, when the tension generated by the relative sliding of the first slide rail 11 and the second slide rail 12 in the horizontal direction acts on the tilted link, the component of the tension in the direction perpendicular to the length of the tilted link should be directed upwards.

[0053] In one embodiment, when the first slide rail 11 and the second slide rail 12 slide relative to each other in a direction away from each other to the end of their travel, the third hinge portion 16 is positioned horizontally between the first hinge portion 14 and the second hinge portion 15.

[0054] Specifically, since the present invention utilizes the unfolding of the first connecting rod 21 and the second connecting rod 22 to lift the object 5, considering the stability and self-locking of the structure after lifting, the third hinge 16 needs to be positioned horizontally between the first hinge 14 and the second hinge 15. In this way, the gravity of the object 5 being lifted acts on the first connecting rod 21 and the second connecting rod 22 through the third hinge 16, causing the first connecting rod 21 and the second connecting rod 22 to have a tendency to further unfold (that is, the distance between the first hinge 14 and the second hinge 15 further increases). However, since the first slide rail 11 and the second slide rail 12 slide relative to each other in a direction away from each other to reach the end of their stroke, the distance between the first hinge 14 and the second hinge 15 cannot be further increased, thereby achieving the self-locking of the connecting rod and ensuring the height stability of the object 5 after it is lifted.

[0055] In one embodiment, the lifting assembly 2 further includes a third link 23, one end of which is hinged together with the ends of the first link 21 and the second link 22 to form a third hinge portion 16, and the other end of the third link 23 is hinged to the fourth hinge portion 51 of the object being lifted 5.

[0056] Specifically, the third hinge 16 is connected to the object being lifted 5 via a third link 23. The purpose of the third link 23 is to increase the height to which the object being lifted 5 can be raised. See the attached diagram for details. Figure 2 In the lowered state, the height of the end of the third link 23 that forms the fourth hinge portion 51 with the object being lifted 5 is basically the same as the height of the third hinge portion 16, only slightly higher than the third hinge portion 16; (See attached figure) Figure 7 As shown, when the linkage structure unfolds, the first link 21 applies a pulling force to the third hinge 16, causing the second link 22 and the third link 23 to unfold relative to each other. Consequently, the height of the fourth hinge 51 between the end of the third link 23 and the object being lifted 5 further increases to be higher than the third hinge 16. Therefore, compared to the third hinge 16 directly connecting to the object being lifted 5, the third link 23 can further increase the lifting height, thus amplifying the lifting effect on the object being lifted 5.

[0057] In one embodiment, the slide rail assembly 1 further includes a fixed rail 13, which is disposed on the side wall of the storage cavity that accommodates the object to be lifted 5. The first slide rail 11 is engaged with the fixed rail 13 and can slide relative to the fixed rail 13 so that the object to be lifted 5 can be moved out of the storage cavity.

[0058] Specifically, as shown in the attached diagram. Figure 2 As shown in the figure, the fixed rail 13 in the slide rail assembly 1 cooperates with the first slide rail 11, and the fixed rail 13 is arranged as shown in the figure. Figure 1 On the side wall of the storage cavity on the corresponding device shown, the aforementioned means are achieved so that before the object to be lifted 5 is raised, the object to be lifted 5 is moved out of the corresponding storage cavity by sliding, so that there is enough space for the object to be lifted 5 to be raised.

[0059] In one embodiment, a side plate 3 is also provided on the side of the fixed rail 13, and a groove 31 extending along the length direction of the fixed rail 13 is provided on the side of the second slide rail 12. A positioning pin 122 that is slidably engaged in the groove 31 extends from the side of the second slide rail 12.

[0060] Among them, a locking mechanism 4 is provided on the side plate 3 at the end of the corresponding slide groove 31. The locking mechanism 4 is used to lock the position of the positioning pin 122 in the slide groove 31. When the positioning pin 122 is in the locking mechanism 4, the first slide rail 11 slides relative to the fixed rail 13 in a direction away from each other to the end of the stroke.

[0061] Specifically, the cooperation between the positioning pin 122 and the slide groove 31 serves two purposes: First, it limits the travel end point of the second slide rail 12. Since lifting the object 5 requires relative sliding between the first slide rail 11 and the second slide rail 12, this embodiment uses the positioning pin 122 and the slide groove 31 to restrict further sliding of the second slide rail 12, allowing it to slide further and thus achieving relative sliding between the first slide rail 11 and the second slide rail 12. Second, the locking mechanism 4 at the slide groove 31 further enables the first slide rail 11 and the second slide rail 12 to slide in opposite directions relative to each other. This allows the object 5 to descend to its initial position, facilitating its return to the storage cavity. That is, when the first slide rail 11 slides in the opposite direction, the second slide rail 12 remains stationary under the action of the locking mechanism 4, thus achieving relative sliding between the first slide rail 11 and the second slide rail 12 in opposite directions.

[0062] In one embodiment, the locking mechanism 4 includes:

[0063] A first locking member 41 is hinged to the side plate 3. The first locking member 41 is connected to a first elastic member 411. The edge of the first locking member 41 also has a locking groove 412 and a snap-fit ​​groove 413. When the first elastic member 411 is in a free state, the opening of the locking groove 412 is located on the path of the locating pin 122 sliding along the slide groove 31.

[0064] The second locking member 42 is hinged to the side plate 3, and the second locking member 42 is connected to the second elastic member 421; wherein...

[0065] The first locking member 41 can rotate under the push of the positioning pin 122 that slides into the locking groove 412 and deform the first elastic member 411 so that the groove opening of the locking groove 412 is misaligned with the path of the slide groove 31 and the locking groove 413 is engaged with the second locking member 42.

[0066] The second locking member 42, which engages with the locking groove 413, can prevent the first locking member 41 from rotating in the opposite direction. The elastic force of the second elastic member 421 is used to maintain the engagement state between the locking groove 413 and the second locking member 42.

[0067] Specifically, the locking mechanism 4 in the unlocked state is shown in the attached figure. Figure 3 and Figure 4 As shown, at this time, the positioning pin 122 has not yet reached the locking mechanism 4. Under the action of the first elastic member 411, the snap-fit ​​groove 413 of the first locking member 41 and the second locking member 42 are in a completely separated state. The locking groove 412 of the first locking member 41 is inclined relative to the extension direction of the slide groove 31, and the opening of the locking groove 412 is on the path of the positioning pin 122 sliding along the slide groove 31.

[0068] The locking mechanism 4 in the locked state is shown in the attached figure. Figure 5 and Figure 6 As shown, when the positioning pin 122 moves to the locking mechanism 4, it enters through the slot, thereby pushing the first locking member 41 to rotate around the hinge point until it contacts the second locking member 42, while simultaneously stretching the first elastic member 411. The outer side of the latching portion extending from the main body of the first locking member 41 and the second locking member 42 makes initial contact. The outer side of the latching portion is provided with a slope, which can guide local deformation, causing the first locking member 41 to rotate further until its latching groove 413 accommodates the main body of the second locking member 42. After the main body of the second locking member 42 enters the latching groove 413, the latching teeth on the inner side of its latching portion engage with the first locking member 41. Combined with the action of the second elastic member 421 to maintain the engagement state, the first locking member 41 cannot rotate in the opposite direction, thus maintaining the locked state. At this time, the slot of the locking groove 412 is also misaligned with the path of the sliding groove 31, thereby locking the position of the positioning pin 122.

[0069] Based on the above structure of the locking mechanism 4, when the first slide rail 11 moves in the reverse direction, the second slide rail 12 is locked in position by the positioning pin 122, maintaining relative stillness with the side plate 3. Thus, the reverse movement of the first slide rail 11 will not drive the second slide rail 12, and the first slide rail 11 and the second slide rail 12 can slide relative to each other. This process is manifested in the lifted object 5 as the horizontal position of the lifted object 5 remains unchanged (maintaining its position outside the storage cavity), and the height continuously decreases to the initial position.

[0070] In one embodiment, when the second slide rail 12 slides relative to the first slide rail 11 in a direction that brings them closer together to the end of its travel, the second slide rail 12 or the lifted object 5 that has descended to the initial position can press against the second locking member 42 that is engaged with the locking groove 413 to release the engagement state of the second locking member 42.

[0071] Specifically, after the first slide rail 11 moves in the reverse direction until the height of the lifted object 5 continuously decreases to the initial position, it is necessary for the slide rail assembly 1, the lifting assembly 2, and the lifted object 5 to enter the storage cavity together. This requires contact between the second locking member 42 and the first locking member 41, thereby releasing the positioning pin 122. Furthermore, a corresponding pressing structure is provided on the lifted object 5 or the first slide rail 11, so that when the first slide rail 11 slides further in the reverse direction, the pressing structure can press the second locking member 42 (see attached diagram). Figure 6 As shown, by squeezing from above, the first locking member 41 is rotated at a certain angle, thereby releasing the locking part of the second locking member 42. The first locking member 41 is then rotated back to its original position under the action of the first elastic member 411, and the positioning pin 122 can be removed from the locking groove 412.

[0072] In one embodiment, it includes two slide rail assemblies 1, each slide rail assembly 1 is connected to at least two lifting components 2, the lifting components 2 of the two slide rail assemblies 1 respectively support both sides of the object being lifted 5, and multiple lifting components 2 connected to the same slide rail assembly 1 are distributed along the track direction of the slide rail assembly 1.

[0073] Specifically, the accompanying drawings in the instruction manual Figures 2 to 7 The diagram only shows one slide rail assembly 1 and two lifting assemblies 2 on it, which is the structure on one side of the object being lifted 5. The other side of the object being lifted 5 also has the same structure. In this way, the symmetrical structure of the slide rail assemblies 1 on both sides and the structure of the lifting mechanism composed of multiple lifting assemblies 2 are more stable.

[0074] An embodiment of the present invention also provides a drawer, which includes the above-described pull-out lifting mechanism and a drawer box supported by the lifting component of the pull-out lifting mechanism, thereby possessing all the technical effects it has.

[0075] Embodiments of the present invention also provide a freezer, which includes the drawer as claimed in claim 1 and a storage cavity for accommodating the drawer, thereby possessing all the technical effects thereof.

[0076] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A pull-out lifting mechanism, characterized in that, include: A slide rail assembly, the slide rail assembly including a first slide rail and a second slide rail slidably engaged with the first slide rail; as well as A lifting assembly, which carries an object to be lifted, includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to a first hinge portion of a first slide rail, and one end of the second connecting rod is hinged to a second hinge portion of the second slide rail. The other ends of the first and second connecting rods are hinged together to form a third hinge portion, which is connected to the object to be lifted. When the first slide rail and the second slide rail are retracted relative to each other, the first hinge and the second hinge are close to each other, and the first link and the second link are in a folded-down state under the gravity of the object being lifted. When the first slide rail and the second slide rail slide relative to each other in a direction away from each other, the first hinge and the second hinge move away from each other and drive the first connecting rod and the second connecting rod to rotate in an upright direction, so that the position of the third hinge is raised.

2. The pull-out lifting mechanism according to claim 1, characterized in that, When the first link and the second link are in the folded-down state, the height of the third hinge is higher than that of the first hinge and / or the second hinge.

3. The pull-out lifting mechanism according to claim 1 or 2, characterized in that, When the first slide rail and the second slide rail slide relative to each other in a direction away from each other to the end of their travel, the third hinge portion is positioned horizontally between the first hinge portion and the second hinge portion.

4. The pull-out lifting mechanism according to claim 1, characterized in that, The lifting assembly also includes a third link, one end of which is hinged together with the ends of the first link and the second link to form the third hinge portion, and the other end of the third link is hinged to the fourth hinge portion of the object being lifted.

5. The pull-out lifting mechanism according to claim 1, characterized in that, The slide rail assembly also includes a fixed rail, which is disposed on the side wall of the storage cavity that accommodates the object to be lifted. The first slide rail is engaged with the fixed rail and can slide relative to the fixed rail to move the object to be lifted out of the storage cavity.

6. The pull-out lifting mechanism according to claim 5, characterized in that, The side of the fixed rail is also provided with a side plate, and the side plate has a groove extending along the length direction of the fixed rail. The side of the second slide rail extends out a positioning pin that is slidably engaged in the groove. The side plate is provided with a locking mechanism at the position corresponding to the end of the slide groove. The locking mechanism is used to lock the position of the positioning pin in the slide groove. When the positioning pin is in the locking mechanism, the first slide rail slides relative to the fixed rail in a direction away from each other to the end of the stroke.

7. The pull-out lifting mechanism according to claim 6, characterized in that, The locking mechanism includes: A first locking member, hinged to the side plate, is connected to a first elastic member. The edge of the first locking member also has a locking groove and a snap-fit ​​groove. When the first elastic member is in a free state, the opening of the locking groove lies on the path along which the locating pin slides along the slide groove. A second locking element, hinged to the side plate, is connected to a second elastic element; wherein... The first locking member can rotate under the push of the positioning pin that slides into the locking groove and deform the first elastic member so that the opening of the locking groove is misaligned with the path of the slide groove and the locking groove is engaged with the second locking member. The second locking member, which engages with the locking groove, can prevent the first locking member from rotating in the opposite direction, and the elastic force of the second elastic member is used to maintain the engagement state between the locking groove and the second locking member.

8. The pull-out lifting mechanism according to claim 7, characterized in that, When the second slide rail slides relative to the first slide rail in a direction that brings them closer together to the end of its travel, the second slide rail or the lifted object that has descended to the initial position can press against the second locking member that is engaged with the locking groove to release the locking state of the second locking member.

9. The pull-out lifting mechanism according to claim 1, characterized in that, It includes two slide rail assemblies, each slide rail assembly is connected to at least two lifting components, the lifting components of the two slide rail assemblies respectively support both sides of the object being lifted, and multiple lifting components connected to the same slide rail assembly are distributed along the track direction of the slide rail assembly.

10. A drawer, characterized in that, It includes a pull-out lifting mechanism as described in any one of claims 1 to 9 and a drawer box supported by a lifting component of the pull-out lifting mechanism.

11. A freezer, characterized in that, It includes the drawer as described in claim 10 and a storage cavity for receiving the drawer.

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