TWI726792B - dining car - Google Patents

Abstract

The present invention relates to a dining car, which includes a set of first link sets and a set of second link sets spaced apart from each other, and a first platform and a second link set are pivotally connected between the first and second link sets. Platform and a third platform, the first platform is fixedly connected to a connecting rod, and the two ends of the connecting rod are respectively fixedly connected to two wheel frame groups, so that the first and second connecting rod groups are allowed to pivot to An upright position or a horizontal position. When the first and second connecting rod groups are in the upright position, the first, second and third platforms are vertically arranged in a straight line, and when the first and second connecting rod groups are in the horizontal position When the time, the second and third platforms revolve around the first platform until the first, second and third platforms are horizontally arranged in a straight line.

Description

dining car

The invention relates to a dining cart, especially a dining cart that is convenient for restaurant waiters to sort out food residues and used tableware on the table after a customer has a meal, or is used to deliver customers' meals.

Because restaurants need to serve multiple guests at a time, for the convenience of work, some restaurants will be equipped with dining carts, which can be used to transport food or recycle used tableware and food residues on the table. Traditional dining carts are all upright. Layered design, so in many cases the waiter needs to bend or squat to match the height of the dining car. This design is less ergonomic. Further long-term or frequent bending or squatting or standing may cause The waiter was injured.

To solve this problem, the present invention provides a dining car including: a first linkage group, a second linkage group, a first platform, pivotally connected to the first and second linkage groups, and separated from the first platform A second platform of the first and second connecting rod groups is pivotally connected, at least two first containers are arranged on the first and second platforms, a carrier is fixed on the second platform, and a second container , Detachably combined with the carrier, a connecting rod, fixed on the first platform, the connecting rod includes two outer ends, the connecting rod further includes two spaced apart shaft joints, two wheel frame sets, respectively connected with The two outer ends of the rod are fixedly connected. Each wheel frame set includes two wheels, an auxiliary device, including a fixed end and a movable end. The fixed end of the auxiliary device is pivotally connected to the first connecting rod group, and the movable end of the auxiliary device Pivotally connected to the connecting rod, the auxiliary device assists the first and second connecting rod groups to pivot together between an upright position and a horizontal position, when the first and second connecting rod groups are between the vertical and horizontal positions When pivoting, the second platform moves along with the first platform and the first platform stays still. When the first and second connecting rod groups are in the upright position, the distance between the fixed end and the movable end is smaller than that of the first and second connecting rods. When the rod group is in the horizontal position, when the first and second connecting rod groups are in the upright position, the second platform is located at one of the positions above or below the first platform. When the first and second connecting rod groups are in the horizontal position In the position, the second platform is aligned with the first platform in the height direction.

The dining trolley of the present invention cooperates with the first and second connecting rod sets and the arrangement of the first and second platforms and the two wheel frame sets, so that the first and second connecting rod sets can be pivoted to the first and second platforms to be arranged upright. When the first and second connecting rods are in the upright position, the lateral volume of the dining car is small, which is conducive to the movement of the dining car. The first and second connecting rods When the group is in a horizontal position, the heights of the first, second and third platforms are within reach of ordinary people when standing, which can reduce the burden of the waiter when delivering meals or recycling tableware and food waste.

The dining car, wherein the first platform includes a first outer pivot portion and a first inner pivot portion, the first outer pivot portion is higher in the height direction than the first inner pivot portion, and the first platform has a An outer pivot portion is pivotally connected to the second link group, a first inner pivot portion is pivotally connected to the first link group, and the second platform includes a second outer pivot portion and a second inner pivot portion , The second outer pivot is higher in the height direction than the second inner pivot, and the second outer pivot of the second platform is pivotally connected to the second linkage group, and the second inner pivot is connected to the first The connecting rod group is pivotally connected.

The second container further includes a lid. The lid includes a guide plate and a scraper formed at a central incline and spaced apart from each other. An elongated opening is formed between the guide plate and the scraper, and the opening and The internal space of the second container communicates with each other.

The lid of the second container is provided with a scraper, which can help scrape away food residues remaining on the dinner plate.

The carrier further includes a vertical part combined with the second platform and a horizontal part to provide the second container abutting against.

The present invention also provides a dining car, which includes: a first linkage group, a second linkage group, a first platform, pivotally connected to the first and second linkage groups, and a second platform spaced apart from the first platform. The platform is pivotally connected to the first and second connecting rod groups, a connecting rod is fixed on the first platform, the connecting rod includes two outer ends, the connecting rod further includes two spaced apart shaft joints, and two wheel frames Groups are respectively fixedly connected to the two outer ends of the connecting rods. Each wheel frame group includes two wheels. Together, the first and second connecting rod groups can pivot between an upright position and a horizontal position. When the first and second linkage groups pivot between the vertical and horizontal positions, the second platform moves along with the first platform and remains stationary. When the first and second linkage groups are in the upright position, the first platform The second platform is located at either position above or below the first platform. When the first and second link groups are in a horizontal position, the second platform is aligned with the first platform in the height direction.

The present invention will be understood more clearly under the detailed description of the illustrative embodiments of the present invention in conjunction with the drawings.

The present invention relates to a dining car, which can be used to deliver food to customers who order food or to recover food residue and tableware left after customers have eaten. Referring to Figures 1 to 3, the dining car 10 includes a first connecting rod group 20. The first connecting rod group 20 includes two rods parallel to each other. The first connecting rod group 20 further includes a set of first ends 22. And a set of second ends 24 spaced apart from the first end 22, the first link group 20 further includes a push-pull handle 34 connected between the set of first ends 22, and two of the first link group 20 A first pivot portion 26, a second pivot portion 28, a third pivot portion 30, and a joint portion 32 are respectively provided between the first and second ends 22 and 24 on the rod. The first pivot portion 26 is located between the coupling portion 32 and the third pivot portion 30, the second pivot portion 28 is located between the first end 22 and the coupling portion 32, and the third pivot portion 30 is located on the second end 24.

The dining car 10 further includes a set of second connecting rod groups 36. The second connecting rod group 36 is substantially composed of two parallel rods. The second connecting rod group 36 includes a set of first ends 38 and a set of second ends. 40. The second connecting rod group 36 further includes a set of first connecting portions 42, a set of second connecting portions 44, and a set of third connecting portions 46 formed between the first and second ends 38, 40. A connecting portion 42 is located between the second and third connecting portions 44, 46, the second connecting portion 44 is located at the first end 38 and the third connecting portion 46 is located at the second end 40.

The dining car 10 further includes a first platform 48, a second platform 54 and a third platform 60 pivotally connected between the first and second linkage groups 20 and 36. The first platform 48 includes a spaced apart platform 48. The first outer pivot portion 50 and a first inner pivot portion 52, and the position of the first outer pivot portion 50 in the height direction is higher than the first inner pivot portion 52. The second platform 54 includes a second outer pivot portion 56 and a second inner pivot portion 58 spaced apart, and the second outer pivot portion 56 is higher in the height direction than the second inner pivot portion 58. The third platform 60 includes a third outer pivot portion 62 and a third inner pivot portion 64 spaced apart, and the third outer pivot portion 62 is higher than the third inner pivot portion 64 in the height direction.

The first inner pivot portion 52 of the first platform 48 is pivotally connected to the first pivot portion 26 of the first link group 20 and the first outer pivot portion 50 is pivotally connected to the first connecting portion 42 of the second link group 36. The second inner pivot portion 58 of the second platform 54 is pivotally connected to the second pivot portion 28 of the first link group 20, and the second outer pivot portion 56 is pivotally connected to the second connecting portion 44 of the second link group 36 In this way, the first and second link groups 20 and 36 are combined with the first and second platforms 48 and 54 to form a parallel link mechanism. In addition, the third inner pivot portion 64 of the third platform 60 is pivotally connected to the third pivot portion 30 of the first link group 20, and the third outer pivot portion 62 is pivotally connected to the third connecting portion 46 of the second link group 36. . Furthermore, a first container 66 can be provided on each of the first, second and third platforms 48, 54 and 60.

The dining trolley 10 further includes a connecting rod 111 fixed at the bottom of the first platform 48. The connecting rod 111 includes two outer ends 113 spaced apart from each other. The connecting rod 111 further includes two shafts formed at the two outer ends 113. The connecting part 115 and the two outer ends 113 of the connecting rod 111 are respectively fixed with a set of wheel frame groups 68. Each wheel frame group 68 includes a triangular wheel frame 70, and two wheels 71 are provided at the two ends of each wheel frame 70. A coupling plate 72 is fixed on the side of each wheel bracket 70. In addition, each wheel frame group 68 further includes a side cover 74 that is detachably clamped on the wheel bracket 70. In fact, each wheel frame group 68 is fixed by welding with the two outer ends 113 of the connecting rod 113 with the connecting plate 72. In this state, the first platform 48 and the connecting rod 111 cannot rotate relative to the wheel frame group 68.

The wheels 71 of the two wheel frame groups 68 contact the ground and support the dining car 10. In this state, the first and second linkage groups 20, 36 are allowed to pivot to an upright position (such as the second and third As shown in the figure) or a horizontal position (as shown in Figures 5 and 6).

The dining car 10 further includes two auxiliary devices 94, and each auxiliary device 94 includes a fixed end 96 and a movable end 98 that can be moved. The fixed end 96 of each auxiliary device 94 is pivotally connected to each joint 32 of the first link group 20, and the movable end 98 of each auxiliary device 94 is pivotally connected to the shaft joint 115 of the connecting rod 111. In essence, the auxiliary devices 94 can be composed of hydraulic cylinders, pneumatic cylinders or electric cylinders.

The dining trolley 10 also includes two supporting members 76 fixed on the sides of the second platform 54. Each supporting member 76 includes a vertical portion 78 and a horizontal portion 80. The vertical portion 78 of each supporting member 76 is fixed with an engaging member 81. (As shown in Figure 3). Therefore, the vertical portion 78 of each bearing member 76 is arranged on the side of the second platform 54.

A second container 83 is detachably provided on each carrier 76, each second container 83 includes a cover 84, and each cover 84 includes a guide plate 88 and a scraper formed in a centrally inclined and spaced apart. 90. An elongated opening 86 is formed between the guide plate 88 and the scraper 90, and the opening 86 communicates with the inner space of the second container 83. Each cover 84 further includes an engaging portion 92 formed on the outer side. . The engaging portion 92 of each second container 83 is detachably engaged with the engaging member 81 of the supporting member 76, and each second container 83 abuts against the horizontal portion 80 of the supporting member 76.

For the convenience of description, suppose that the first and second linkage groups 20 and 36 of the dining trolley 10 are in an upright position. As shown in Figures 2 and 3, in this state, the second platform 54 is in the first height direction. The platform 48 is above and arranged in a straight line, the third platform 60 is located below the first platform 48 in the height direction and arranged in a straight line, and the first and second platforms 48 and 54 or the first and third platforms 48 and 60 are separated from each other. The opening distance is greater than the height of each first container 66, so that each first container 66 of the dining trolley 10 is arranged upright. It is worth mentioning that when the first and second linkage groups 20 and 36 are in the upright position, the distance between the movable end 98 and the fixed end 96 of the two auxiliary devices 94 is the closest, and the two auxiliary The device 94 can help the first and second linkage groups 20 and 36 to maintain the upright position by positioning the movable end 98. In addition, when the first and second linkage groups 20 and 36 are in the upright position, the dining trolley 10 has a smaller lateral volume, which helps the dining trolley 10 move in a space with many tables and chairs (using push-pull handles 34). ).

Assuming that after the guests have finished their meal, the waiter has to clean up the tableware and food residues on the table. The waiter can easily push the dining cart 10 to the table that needs to be cleaned with the first and second linkage groups 20 and 36 in the upright position. When the dining trolley 10 arrives near the table that needs to be cleaned, push and pull 34 from the upright position to turn the first and second linkage groups 20 and 36 to the horizontal position. Refer to Figure 4, because the first platform 48 and the connecting rod 111 is combined with two sets of wheel frames 68, and two further sets of wheel frames 68 contact the ground. Therefore, when the first and second link sets 20 and 36 rotate, the first platform 48 will not have any movement (movement or rotation). ), but the second and third platforms 54 and 60 will rotate horizontally around the first platform 48, that is, the second and third platforms 54 and 60 revolve around the first platform 48 but do not rotate.

Refer to Figures 5 and 6, when the first and second link groups 20, 36 pivot to the horizontal position, the first, second, and third platforms 48, 54, and 60 are at the same height in the height direction. When the first and second connecting rod groups 20 and 36 are in the horizontal position, the distance between the fixed end 96 and the movable end 98 of each auxiliary device 94 is farther than that of the first and second connecting rod groups 20 and 36 in the upright position. Similarly, by positioning the movable ends 98 of the auxiliary devices 94, the first and second linkage groups 20 and 36 can be kept in a horizontal position.

When the first and second link groups 20, 36 are kept in a horizontal position, the first, second, and third platforms 48, 54, and 60 are the same height in the height direction, and are preferably set to the first, second, and The third platforms 48, 54 and 60 are set at a height that ordinary people can reach without bending over. Such a height can reduce the burden on the waiter to deliver meals or recycle used tableware, food waste, and kitchen waste.

It is worth mentioning that the dining cart 10 of the present invention is equipped with each first container 66 and each second container 83 more suitable for recycling used tableware, food residues and food waste, that is to say, used tableware can interact with each other. Stack, so you can put multiple bowls, plates, forks. . . The tableware is stacked in each first container 66, and each first container 66 can ensure that the stacked tableware will not fall out of the dining trolley 10, and the food residue or kitchen waste remaining on the tableware can enter each second container 83 . It is worth mentioning that the design of the lid 84 of each second container 83 can help the waiter to remove the food residue from the plate with one hand. Specifically, the plate with the food residue slides along the guide plate 88 through the opening 86, and the service You can slightly raise the plate with one hand, so that the scraper 90 touches the food residue in the plate, and further pulls the plate away from the second container 83, so that the scraper 90 can moderately scrape the food residue on the plate.

If you want to use the dining trolley 10 to deliver meals, the first and second containers 66 and 83 can be removed from the dining trolley 10 because the trays containing food cannot be stacked. The trays containing food can be placed in the first and second containers. Direct delivery to customers on the second and third platforms 48, 54 and 60.

The dining car 10 of the present invention is equipped with the first and second connecting rod sets 20, 36 to cooperate with the first and second platforms 48, 54 and the two sets of wheel frame sets 68, so that the first and second connecting rod sets 20, 36 can be Pivot to the upright position where the first and second platforms 48 and 54 are arranged upright or the horizontal position where the first and second platforms 48 and 54 are arranged horizontally. When the first and second link groups 20 and 36 are in the upright position, The lateral volume of the dining trolley 10 is small, which is conducive to the movement of the dining trolley 10. When the first and second linkage groups 20 and 36 are in the horizontal position, the height of the first, second and third platforms 48, 54 and 60 is higher than that of ordinary people. A position within easy reach when standing can reduce the burden of the waiter when delivering meals or recycling tableware and food waste.

The two auxiliary devices 94 can help the first and second linkage groups 20 and 36 to be positioned in an upright or horizontal position.

The lid 84 of the second container 83 is provided with a scraper 90, which can help scrape away food residues remaining on the dinner plate.

The basic teaching of the present invention has been explained, and many extensions and changes will be obvious to those with ordinary skills in the field. For example, the third platform 60 may not be included. In the dining car 10 of the present invention, as long as the first and second linkage groups 20, 36 cooperate with the first and second platforms 48, 54 to form a parallel linkage mechanism, if the second platform is not provided, The state of the three platforms 60 does not affect the rotation of the first and second link groups 20, 36 to the upright position so that the first and second platforms 48, 54 are arranged upright or the horizontal position is such that the first and second platforms 48, 54 are arranged horizontally. Function. Alternatively, each auxiliary device 94 may be an electric cylinder, so that driving the movable end 98 of each auxiliary device 94 to move can control the first and second link groups 20, 36 to pivot to the upright position or the horizontal position.

Since the invention disclosed in the specification can be implemented in other specific forms that do not depart from the spirit or general characteristics of the invention, and some of these specific forms have been pointed out, the embodiments disclosed in the specification should be regarded as illustrative rather than restrictive. The scope of the present invention is defined by the scope of the attached patent application, rather than the above description. All changes to the equivalent meaning and scope falling within the scope of the patent application will still be included in its scope.

10: Dining car 20: The first connecting rod group 22: The first end 24: The second end 26: The first pivot 28: The second pivot 30: The third pivot 32: Joint 34: Push and pull handle 36: The second connecting rod group 38: The first end 40: The second end 42: The first connecting part 44: The second connecting part 46: The third connecting part 48: The first platform 50: The first outer hub 52: The first inner hub 54: The second platform 56: The second outer pivot 58: The second inner pivot 60: The third platform 62: The third outer hub 64: The third inner hub 66: The first container 68: Wheel frame group 70: Wheel bracket 71: Wheels 72: Combination board 74: Side cover 76: Carrier 78: Vertical part 80: Horizontal part 81: Clips 83: The second container 84: Lid 86: Opening 88: Guide board 90: Scraper 92: The clamping part 94: Auxiliary device 96: Fixed end 98: Active end １１：Connecting rod 113: Outer end 115: Shaft joint

Figure 1 is a perspective exploded view of the dining car of the present invention.

Figure 2 is a perspective view of the first and second linkage groups of the dining car of the present invention in an upright position.

Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2.

Figure 4 shows the state diagram of the pivoting process of the first and second link groups from the upright position to the horizontal position.

Figure 5 is a perspective view of the first and second linkage groups of the dining car of the present invention in a horizontal position.

Figure 6 is a cross-sectional view taken along line 6-6 of Figure 5.

All the drawings are only for the convenience of explaining the basic teachings. The numbers, positions, relationships, and extensions of the dimensions of the elements constituting the illustrative embodiments will be explained in the drawings or belong to the skill of the industry after reading and understanding the following description. In addition, after reading and understanding the following description, it is also the industry's skill to change the precise size and size ratio to meet specific strength, weight, strength, and similar requirements.

The same or similar elements are marked with the same reference numbers in different drawings; in addition, please understand the text such as "top", "bottom", "first", "second", "forward", "backward", and "reverse". "Toward", "front", "rear", "height", "width", "length", "end", "side", "horizontal", "vertical", etc. and similar terms are only convenient for the viewer Reference is made to the drawings and is only used to help describe the illustrative embodiments.

10: dining car

20: The first connecting rod group

22: first end

24: second end

26: The first pivot

28: The second pivot

30: The third pivot

32: Joint

34: push and pull handle

36: The second connecting rod group

38: first end

40: second end

42: The first connection part

44: The second connecting part

46: third connection part

48: The first platform

50: The first outer hub

52: The first inner hub

54: The second platform

56: second outer hub

58: second inner hub

60: The third platform

62: Third Outer Hub

64: third inner hub

66: The first container

68: Wheel frame group

70: Wheel bracket

71: wheels

72: Combination board

74: side cover

76: Carrier

78: vertical part

83: second container

84: Lid

86: open

88: Guide board

90: scraper

92: Snap part

94: auxiliary device

96: fixed end

98: Active end

111: connecting rod

113: Outer End

115: Shaft joint

Claims (10)

A dining car includes: a first connecting rod group; a second connecting rod group; a first platform pivotally connected to the first and second connecting rod groups; a second platform separated from the first platform and connected to the first platform The first and second link sets are pivotally connected; a third platform separated from the first and second platforms is pivotally connected to the first and second link sets, and the second platform is located between the first and third platforms Between; three first containers, set on the first, second and third platforms; one carrier, fixed on the second platform; one second container, detachably combined with the carrier, the second container And located on the outer side of the first container; a connecting rod fixed on the first platform, the connecting rod includes two outer ends, the connecting rod further includes two spaced apart shaft joints; two wheel frame groups, respectively with the connecting rod The two outer ends of the auxiliary device are fixedly connected, and each wheel frame group includes two wheels; an auxiliary device includes a fixed end and a movable end. The fixed end of the auxiliary device is pivotally connected to the first linkage group, and the movable end of the auxiliary device is pivoted Connected to the connecting rod, the auxiliary device assists the first and second connecting rod groups to pivot together between an upright position and a horizontal position. When the first and second connecting rod groups pivot between the vertical and horizontal positions When turning, the second and third platforms move along with the first platform and the first platform remains stationary. When the first and second connecting rod groups are in the upright position, the distance between the fixed end and the movable end is smaller than that of the first and second connecting rods. The distance between the fixed end and the movable end when the two connecting rod groups are in the horizontal position; when the first and second connecting rod groups are in the upright position, the second platform is located on the first platform In other words, the third platform is located below the first platform, and when the first and second connecting rod groups are in a horizontal position, the second and third platforms are aligned with the first platform in the height direction. The dining car described in item 1 of the scope of patent application, wherein the first platform includes a first outer pivot portion and a first inner pivot portion, and the first outer pivot portion is higher in the height direction than the first inner pivot portion , The second connecting rod group includes a first connecting part, a second connecting part and a third connecting part, the first connecting part is located between the second and third connecting parts, and the second connecting part of the first platform An outer pivot part is pivotally connected to the first connecting part of the second connecting rod group, the second and third connecting parts are located outside the first platform, and the first connecting rod group includes a first pivot Part, a second pivot part, and a third pivot part, the first pivot part is located between the second and third pivot parts, the first inner pivot part is connected to the first pivot part of the first linkage group Then, the second and third pivots are located outside the first platform, and the second platform includes a second outer pivot and a second inner pivot. The position of the second outer pivot in the height direction Is higher than the second inner pivot, and the second outer pivot of the second platform is pivotally connected to the second connecting portion of the second linkage group, and the second inner pivot is connected to the second connecting portion of the first linkage group. The third platform includes a third outer pivot and a third inner pivot. The position of the third outer pivot in the height direction is higher than the third inner pivot, and the third platform of the third platform The outer pivot part is pivotally connected to the third connecting part of the second link group, and the third inner pivot part is pivotally connected to the third pivot part of the first link group. As for the dining cart described in item 1 of the scope of the patent application, the second container further includes a lid. The lid includes a guide plate and a scraper formed at the center inclined and spaced apart from each other. An elongated opening is formed in between, and the opening is communicated with the internal space of the second container. According to the dining cart described in item 3 of the scope of patent application, the second container further includes an engaging part formed on the side of the lid, the carrier includes an engaging part corresponding to the engaging part, and the engaging part It is detachably fitted with the engaging member. According to the dining cart described in item 1 of the scope of the patent application, the carrier further includes a vertical portion combined with the second platform and a horizontal portion provided for the second container to abut against. A dining car includes: a first connecting rod group; a second connecting rod group; a first platform pivotally connected to the first and second connecting rod groups; a second platform separated from the first platform and connected to the first platform The first and second link sets are pivotally connected; a third platform separated from the first and second platforms is pivotally connected to the first and second link sets, and the second platform is located between the first and third platforms Between; a connecting rod, fixed on the first platform, the connecting rod includes two outer ends, the connecting rod further includes two spaced apart shaft joints; two wheel frame sets, respectively fixed with the two outer ends of the connecting rod Then, each wheel frame set includes two wheels, and the first and second link sets can pivot together between an upright position and a horizontal position. When the first and second link sets are in the vertical and horizontal positions When pivoting between, the second platform moves and the first platform remains stationary; when the first and second linkage groups are in an upright position, the second platform is located above the first platform, and the second platform is located above the first platform. The three platforms are located below the first platform. When the first and second connecting rod groups are in a horizontal position, the second and third platforms are aligned with the first platform in the height direction. As described in item 6 of the scope of patent application, the dining car further includes: an auxiliary device including a fixed end and a movable end. The fixed end of the auxiliary device is pivotally connected to the first linkage group, and the movable end of the auxiliary device is pivotally connected to Connecting rods, the auxiliary device assists the first and second connecting rod groups to pivot together between an upright position and a horizontal position, when the first and second connecting rod groups pivot between the vertical and horizontal positions , The second platform moves and the first platform stays still, when the first and second connecting rod groups are in the upright position, the distance between the fixed end and the movable end 98 is smaller than that of the first and second connecting rod groups When in a horizontal position. As described in item 6 of the scope of patent application, the dining cart further includes: a carrier fixed on the second platform; a second container detachably combined with the carrier, the second container further includes a lid, and the lid includes a A guide plate and a scraper are inclined at the center and are spaced apart from each other. An elongated opening is formed between the guide plate and the scraper, and the opening is communicated with the inner space of the second container. According to the dining cart described in item 8 of the scope of patent application, the carrier further includes a vertical portion combined with the second platform and a horizontal portion for abutting the second container, and the second container further includes a side formed on the lid. An engaging part, the carrier includes an engaging part corresponding to the engaging part and arranged on a vertical part, and the engaging part is detachably fitted with the engaging part. As described in item 6 of the scope of patent application, the first platform includes a first outer pivot portion and a first inner pivot portion, and the first outer pivot portion is higher in the height direction than the first inner pivot portion , The second connecting rod group includes a first connecting part, a second connecting part and a third connecting part, the first connecting part is located between the second and third connecting parts, and the second connecting part of the first platform An outer pivot part is pivotally connected to the first connecting part of the second connecting rod group, the second and third connecting parts are located outside the first platform, and the first connecting rod group includes a first pivot Part, a second pivot, and a first Three pivots, the first pivot is located between the second and third pivots, the first inner pivot is pivotally connected to the first pivot of the first linkage group, and the second and third pivots Part is located outside the first platform, the second platform includes a second outer pivot part and a second inner pivot part, the height of the second outer pivot part is higher than the second inner pivot part, and The second outer pivot part of the two platforms is pivotally connected to the second connecting part of the second link group, the second inner pivot part is pivotally connected to the second pivot part of the first link group, and the third platform It includes a third outer pivot and a third inner pivot. The third outer pivot is higher in height than the third inner pivot, and the third outer pivot of the third platform is connected to the second connecting rod. The third connecting part of the group is pivotally connected, and the third inner pivot part is pivotally connected to the third pivot part of the first link group.

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