Liftable sleeper bed

Abstract

The present invention discloses a lifting berth bed, comprising a bed frame and connecting rod assemblies located at both ends of the bed frame. The connecting rod assemblies each comprise an upper connecting rod assembly and a lower connecting rod assembly. The lower connecting rod assembly is hinged at the bottom to the bed frame and hinged at the top to an intermediate plate. The lower connecting rod assembly, the intermediate plate, and the bed frame form a parallelogram-shaped four-bar linkage structure. The upper connecting rod assembly is hinged at the bottom to the intermediate plate and hinged at the top to a support for connecting to a vehicle body. The upper connecting rod assembly, the support, and the intermediate plate form a parallelogram-shaped four-bar linkage structure. In the lifting bed of the present invention, the upper and lower connecting rods are located in the same plane, ensuring the available length of the bed frame. During the lifting process, the space requirement in the width direction of the bed frame is small, and the impact on the berth aisle is small, thereby achieving smooth lifting of the bed within a limited space.

Description

Technical Field

[0001] The invention relates to a vehicle sleeper bed, in particular to a lifting sleeper bed. Background Art

[0002] Currently, EMUs are usually equipped with fixed berths for passengers to ride and sleep. The fixed berths are made of bed plates welded with steel pipes, fastened to the car body with screws, and covered with mattresses. The space in the EMU sleeper car is limited, and the fixed installation cannot be flexibly adjusted to fully utilize the space.

[0003] Patent application CN 115742936 A discloses a RV hammock device and RV. The bed frame is connected to the roof via a swinging frame. The swinging frame, bed frame, and roof form a parallelogram structure. The swinging frame swings forward around its upper end to a vertical position, extending the hammock forward and downward, or rotates backward to close to the roof of the vehicle, retracting the hammock backward and upward. The swinging frame is a hydraulic telescopic rod structure that can adjust the vertical height of the bed frame. The current solution has a wide bed frame, requiring a large space in front of and behind the vehicle during raising and lowering, making it unsuitable for sleeper cars with limited front-to-back distance. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a lifting berth bed to achieve smooth lifting of the bed in a limited space.

[0005] Technical solution: The lifting bunk bed described in the present invention includes a bed frame and connecting rod assemblies located at both ends of the bed frame. The connecting rod assemblies include an upper connecting rod assembly and a lower connecting rod assembly. The bottom of the lower connecting rod assembly is hinged to the bed frame, and the top is hinged to the middle plate. The lower connecting rod assembly, the middle plate, and the bed frame form a parallelogram four-bar structure; the bottom of the upper connecting rod assembly is hinged to the middle plate, and the top is hinged to a support for connecting to the vehicle body. The upper connecting rod assembly, the support, and the middle plate form a parallelogram four-bar structure.

[0006] Preferably, a synchronization plate is provided between the upper connecting rod assembly and the lower connecting rod assembly.

[0007] Preferably, the upper connecting rod assembly has a first connecting rod and a second connecting rod, and the first connecting rod, the second connecting rod and the synchronization plate are hinged by a first pin and a second pin, and the height of the first pin is greater than that of the second pin; the lower connecting rod assembly has a third connecting rod and a fourth connecting rod, and the third connecting rod, the fourth connecting rod and the synchronization plate are hinged by a third pin and a fourth pin, and the height of the third pin is lower than that of the fourth pin; the first connecting rod and the third connecting rod are connected by a synchronization plate.

[0008] Preferably, a first pin extends from the bottom end of the first connecting rod to form a first extension portion, and a third pin extends from the top of the third connecting rod to form a second extension portion. The first extension portion and the second extension portion are connected via a synchronization plate.

[0009] Preferably, a first concave portion is provided on one side of the synchronization plate, and when the bed frame is raised and folded, the first concave portion is used to avoid the first pin shaft; a second concave portion is provided on the other side of the synchronization plate, and when the bed frame is lowered and unfolded, the second concave portion is used to avoid the third pin shaft.

[0010] Preferably, the tops of the third connecting rod and the fourth connecting rod are bent.

[0011] Preferably, the two ends of the synchronization plate are connected to the first connecting rod and the third connecting rod respectively through the fifth pin shaft, the sixth pin shaft and the first connecting rod. Taking the connection line of the fifth pin shaft and the third pin shaft as a reference, when the bed frame is folded or unfolded, the sixth pin shaft is located on the same side of the reference line.

[0012] Preferably, there is a first synchronization rod between the supports at both ends of the bed frame, the first synchronization rod is rotatably connected to the support, the first synchronization rod and the second pin are coaxial, and the end of the first synchronization rod extending into the support is connected to the second connecting rod.

[0013] Preferably, the two ends of the first synchronization rod are connected with a shift rod, the support is hinged with an elastic member, the elastic member includes a sleeve and a shaft rod, the shaft rod is slidingly connected to the sleeve, the shift rod and the shaft rod are hinged, and there is a spring between the shaft rod and the sleeve.

[0014] Preferably, a second synchronization rod is provided inside the bed frame, and the bottom end of the fourth connecting rod is connected to the second synchronization rod.

[0015] Beneficial effects: Compared with the existing technology, the present invention has the following advantages: 1. The bed can be lifted and lowered smoothly in a limited space: the upper and lower connecting rods are located in the same plane to ensure the available length of the bed frame. During the lifting process, the space requirement in the width direction of the bed frame is small, and the impact on the berth aisle is small; 2. During the lifting process, the bed remains horizontal to ensure a smooth lifting process; 3. The lifting distance is large and the volume is small: the double four-link structure effectively improves the lifting height. After folding, the length of the double four-link is no more than the width of the bed, the overall volume is small, and space is saved; 4. Simple operation: the bed frame can be lifted and lowered in one step. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of the lifting berth bed of the present invention in an unfolded state;

[0017] Figure 2 This is a schematic structural diagram of the lifting berth bed of the present invention in a folded state;

[0018] Figure 3 A schematic diagram of the connecting rod connection relationship of the lifting berth in the folded state of the present invention;

[0019] Figure 4 A schematic diagram of the connecting rod connection relationship of the lifting berth in the unfolded state of the present invention;

[0020] Figure 5 This is a top view of the structure of the lifting berth bed in the unfolded state of the present invention

[0021] Figure 6 This is a side view of the structure of the lifting berth bed of the present invention in the unfolded state;

[0022] Figure 7 The figure is a schematic structural diagram of the bed frame of the lifting berth of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0024] As shown in the figure, the lifting bunk bed of the present invention is mainly composed of a bed frame 1 and a connecting rod assembly. There are two groups of connecting rod assemblies, which are located at both ends of the bed frame 1 and are symmetrically arranged on the left and right. Each group of connecting rod assemblies includes an upper connecting rod assembly 2 and a lower connecting rod assembly 3. In order to reduce the impact of the lifting mechanism on the length of the bed frame 1, the upper connecting rod assembly 2 and the lower connecting rod assembly 3 are connected by an intermediate plate 6. Specifically, the bottom of the lower connecting rod assembly 3 is hinged to the end of the bed frame 1, and the top is hinged to the lower side of the intermediate plate 6. The lower connecting rod assembly 3, the intermediate plate 6, and the bed frame 1 form a parallelogram four-bar structure. The bottom of the upper connecting rod assembly 2 is hinged to the upper side of the intermediate plate 6, and the top is connected to the internal fixed structure of the vehicle, such as a wall or a roof, through a support 5. The upper connecting rod assembly 2, the support 5, and the intermediate plate 6 form a parallelogram four-bar structure. By setting the intermediate plate 6, the upper and lower connecting rod assemblies are in the same plane, thereby ensuring the available length of the bed frame 1. The length of the middle plate 6 is smaller than the width of the bed frame 1. When the bed frame is folded, the length of the upper and lower connecting rod assemblies is smaller than the width of the bed frame 1, and the upper and lower connecting rod assemblies can be hidden at both ends of the bed frame 1.

[0025] The upper connecting rod assembly 2 includes connecting rods 21 and 22. The ends of connecting rod 21 are respectively hinged to the support 5 and the intermediate plate 6 via a first pin I. The ends of connecting rod 22 are respectively hinged to the support 5 and the intermediate plate 6 via a second pin II. The two first pins I and the two second pins II form a parallelogram-shaped four-bar linkage structure. When connecting rods 21 and 22 rotate around the support 5, the intermediate plate 6 rises and falls. The first pin I and the second pin II are staggered in height. The lower connecting rod assembly 3 includes connecting rods 31 and 32. Similarly, the ends of connecting rod 31 are respectively hinged to the support 5 and the intermediate plate 6 via a third pin III. The ends of connecting rod 32 are respectively hinged to the support 5 and the intermediate plate 6 via a fourth pin IV. The two third pins III and the two fourth pins IV form a parallelogram-shaped four-bar linkage structure. The third pin III and the fourth pin IV are staggered in height. The staggered direction of the first pin I and the second pin II is opposite to the staggered direction of the second pin II and the fourth pin IV. For example, the first pin I at the top of the connecting rod 21 is higher than the second pin II at the top of the connecting rod 22. Contrary to the upper connecting rod assembly 2, the third pin III at the top of the connecting rod 31 is lower than the fourth pin IV at the top of the connecting rod 32. This arrangement makes installation space for the synchronization structure between the upper connecting rod assembly 2 and the lower connecting rod assembly 3.

[0026] by Figure 3 Taking the left side in the middle as an example, the connecting rod 21 is located on the outside of the connecting rod 22, and the connecting rod 31 is located on the outside of the connecting rod 32. The specific setting of the synchronization structure is as follows: the bottom end of the connecting rod 21 hinged to the middle plate 6 extends to the other side of the first pin shaft I to form a first extension part 211, and the top of the connecting rod 31 hinged to the middle plate 6 extends to the other side of the third pin shaft III to form a second extension part 311. The first extension part 211 and the second extension part 311 are connected by a synchronization plate 61, that is, the first extension part 211 and one end of the synchronization plate 61 are hinged by the fifth pin shaft V, and the second extension part 311 and the other end of the synchronization plate 61 are hinged by the sixth pin shaft VI. By setting the synchronization plate 61, the upper connecting rod assembly 2 and the lower connecting rod assembly 3 located on both sides of the middle plate 6 can move synchronously, and the bed frame 1 remains stable during the lifting process.

[0027] A first concave portion is provided on one side of the synchronization plate 61. When the berth bed is in the raised folded state, the first concave portion is used to avoid the first pin shaft I at the bottom of the connecting rod 21. A second concave portion is provided on the other side of the synchronization plate 61. When the height of the berth bed is lowered when it is unfolded, the second concave portion is used to avoid the third pin shaft III at the top of the connecting rod 31. After the first concave portion and the second concave portion are set, the synchronization plate 61 is approximately Z-shaped.

[0028] Connecting rods 31 and 32 are bent at the top inside third and fourth pins III and IV to optimize force distribution and ensure the load-bearing performance of connecting rods 31 and 32. This bend also reduces the distance between connecting rods 21 and 22 when the bed is folded, allowing them to overlap in the width direction. This also reduces the thickness of the bed frame 1 and the thickness / height of the folded connecting rods 31 and 32. Using the line connecting the fifth pin V, the top of the connecting rod 31, and the hinged third pin III of the middle plate 6 as a reference line, the fourth pin VI is located on the same side of the reference line when the bed is unfolded or folded to prevent the bed from becoming stuck during the raising or lowering process.

[0029] A first synchronization rod 4 is located between the supports 5 at each end of the bed frame 1. The first synchronization rod 4 is rotatably connected to the supports 5. The first synchronization rod 4 extends into the supports 5 at both ends and is fixedly connected to the side of the connecting rod 22. Specifically, the first synchronization rod 4 and the second pin II at the top of the connecting rod 22 are coaxial. A polygonal-cross-section shaft 43 (not shown) is provided at each end of the first synchronization rod 4. A synchronization member 41 is connected to the first synchronization rod 4 via the shaft 43. The side of the connecting rod 22 is fixedly connected to the synchronization member 41. When the connecting rod 22 rotates about the pin, the synchronization member 41 drives the first synchronization rod 4, transmitting the rotation of one end of the bed frame 1 to the other end, ensuring that the bed frame 1 does not suffer from unbalanced loads during its vertical movement. The synchronization member 41 is a bent member to avoid the second pin II.

[0030] A second synchronization rod 8 is provided inside the bed frame 1. The bottoms of the connecting rods 32 at both ends of the bed frame 1 are connected to the second synchronization rod 8 through a square shaft or a polygonal shaft. When the connecting rod 32 at one end rotates, the movement synchronization of the two ends of the bed frame 1 is achieved.

[0031] The first synchronization rod 4 is also connected to a lever 42 at both ends via a shaft 43. A spring 7 is hingedly mounted on the support 5. The spring 7 comprises a sleeve 71 and a shaft 72. A spring (not shown) is positioned between the shaft 72 and the sleeve. The shaft 72 can slide along the sleeve 71 to compress the spring. The lever 42 and the shaft 72 are hingedly mounted. When the first synchronization rod 4 rotates, the lever 42 rotates to compress or release the spring. The spring 7 overcomes the deadweight of the frame, facilitating manual raising and lowering of the bed and ensuring stability during the bed raising and lowering process. By providing the first synchronization rod 4 and the spring 7 and mounting the spring 7 laterally on the support 5, the thickness / height of the folded bed is reduced, preventing the spring from interfering with the folding of the upper and lower connecting rod assemblies 2 and 3. A cover is provided on the support 5 to shield the spring 7 and the top pin of the upper connecting rod assembly 2.

Claims

1. A lifting berth bed, characterized in that: The invention comprises a bed frame (1), and connecting rod assemblies located at both ends of the bed frame, wherein the connecting rod assemblies each comprise an upper connecting rod assembly (2) and a lower connecting rod assembly (3), wherein the bottom of the lower connecting rod assembly (3) is hinged to the bed frame (1), and the top is hinged to the middle plate (6), and the lower connecting rod assembly (3), the middle plate (6), and the bed frame (1) form a parallelogram four-link structure; the bottom of the upper connecting rod assembly (2) is hinged to the middle plate (6), and the top is hinged to a support (5) for connecting to a vehicle body, and the upper connecting rod assembly (2), the support (5), and the middle plate (6) form a parallelogram four-link structure, and a synchronization plate (61) is provided between the upper connecting rod assembly (2) and the lower connecting rod assembly; the upper connecting rod assembly (2) comprises a first connecting rod (21) and a second connecting rod (22), and the first connecting rod (21), the second connecting rod (22), and the middle plate (6) are hinged via a first pin shaft and a second pin shaft, and the height of the first pin shaft is greater than that of the second pin shaft. The lower connecting rod assembly (3) comprises a third connecting rod (31) and a fourth connecting rod (32). The third connecting rod (31), the fourth connecting rod (32) and the middle plate (6) are hinged by a third pin and a fourth pin, and the height of the third pin is lower than that of the fourth pin. The first connecting rod (21) and the third connecting rod (31) are connected by a synchronous plate (61). The bottom end of the first connecting rod (21) extends out of the first pin to form a first extension portion (211), and the top of the third connecting rod (31) extends out of the third pin to form a second extension portion (311). The first extension portion (211) and the second extension portion (311) are connected by a synchronous plate (61). A first concave portion is provided on one side of the synchronous plate (61). When the bed frame is raised and folded, the first concave portion avoids the first pin. A second concave portion is provided on the other side of the synchronous plate (61). When the bed frame is lowered and unfolded, the second concave portion avoids the third pin.

2. The lifting berth bed according to claim 1, characterized in that: The tops of the third connecting rod (31) and the fourth connecting rod (32) are bent.

3. The lifting berth bed according to claim 2, characterized in that: The two ends of the synchronization plate (61) are connected to the first connecting rod (21) and the third connecting rod (31) respectively through the fifth pin shaft, the sixth pin shaft and the first connecting rod (21) and the third connecting rod (31). With the connection line of the fifth pin shaft and the third pin shaft as a reference, the bed frame (1) is folded or unfolded, and the sixth pin shaft is located on the same side of the reference line.

4. The lifting berth bed according to claim 1, characterized in that: A first synchronization rod (4) is provided between the supports (5) at both ends of the bed frame. The first synchronization rod (4) and the support (5) are rotatably connected. The first synchronization rod (4) and the second pin are coaxial. The end of the first synchronization rod (4) extending into the support (5) is connected to the second connecting rod (22).

5. The lifting berth bed according to claim 4, characterized in that: The first synchronization rod (4) is connected to a shift rod (42) at both ends, and an elastic member (7) is hinged on the support (5). The elastic member (7) includes a sleeve (71) and a shaft (72). The shaft (72) is slidably connected to the sleeve (71). The shift rod (42) and the shaft (72) are hinged, and a spring is provided between the shaft (72) and the sleeve (71).

6. The lifting berth bed according to claim 1, characterized in that: A second synchronization rod (8) is provided inside the bed frame (1), and the bottom end of the fourth connecting rod (32) is connected to the second synchronization rod (8).

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