Liftable bunk bed

Abstract

The application discloses a liftable bunk bed, comprising a bed board assembly, the two ends of the bed board are connected with walls through hinge assemblies, the hinge assemblies comprise first connecting rods and second connecting rods, the second connecting rods are located between the first connecting rods and the bed board assembly, the hinge shafts of the first connecting rods, the second connecting rods and the bed board assembly, the hinge shafts of the first connecting rods and the second connecting rods and the walls form parallelograms; with the hinge points of the connecting rods and the walls as references, the bed board assembly can be lifted above the hinge points and lowered below the hinge points, the lifting stroke is doubled, the length of the connecting rods is shortened, the radius required for the lifting and lowering rotation of the bed board assembly is reduced, and the bunk bed is suitable for a limited space.

Description

Technical Field

[0001] The present invention relates to a bed for rail transportation, in particular to a liftable berth bed. Background Art

[0002] In the rail transit industry, traditional sleeper beds are mostly fixed or reversible. Traditional fixed-bed structures keep them fixed and immobile, day or night. Therefore, during the day, the fixed upper and lower berths create a relatively narrow space for movement, forcing passengers to lie on their own berths, impacting daytime comfort. Traditional reversible beds also flip during use, causing items to fall from the bed and requiring items to be removed or tied before use, resulting in a poor user experience.

[0003] The invention patent application with publication number CN 112977221 A discloses a multifunctional sleeper system for a car. A panel is divided in the sleeper area as a table board, and a parallelogram linkage mechanism is set on the bottom of the table board. When the table board is raised, it serves as a table top. The table board lowers to be flush with the sleeper area to form a sleeper bed. In this scheme, the double connecting rods that drive the table board to rise and fall are located in the same plane. The table board can only rise relative to the sleeper plane and cannot fall below the sleeper plane. The lifting stroke of the table board depends entirely on the length of the connecting rod. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a liftable berth bed to reduce the length of the connecting rod while increasing the lifting stroke.

[0005] Technical solution: The liftable berth bed described in the present invention includes a bed board assembly, both ends of the bed board are connected to the wall through a hinge assembly, the hinge assembly includes a first connecting rod and a second connecting rod, the second connecting rod is located between the first connecting rod and the bed board assembly, the first connecting rod, the second connecting rod and the hinge axis of the bed board assembly, the first connecting rod, the second connecting rod and the hinge axis of the wall form a parallelogram.

[0006] Preferably, in order to prevent the parallelogram of the hinge assembly from forming a straight line during the lifting and lowering of the bed board assembly, resulting in unstable movement, the height of the second connecting rod is lower than that of the first connecting rod, that is, the hinge axes of the first connecting rod and the second connecting rod are arranged high and low.

[0007] Preferably, in order to maximize the usable space at both ends of the bed board assembly when the bed board assembly is in the lowered position, the first connecting rod and the second connecting rod are bent at one end hinged to the bed board assembly, the bed board assembly is lowered, and the two connecting rods are close to the wall.

[0008] Preferably, in order to achieve descent buffering and reduce the force required to lift the bed board assembly, the first connecting rod or the second connecting rod is provided with a first spring for connecting to the wall at one end close to the wall.

[0009] Preferably, in order to ensure stability in the lowered position, a support member for connecting to the wall is further included, and when the bed board assembly is in the lowered position, the support member supports the bottom of the bed board assembly.

[0010] Preferably, in order to ensure the stability of the raised position, a lock stop assembly for fixing to the wall is also included, the lock stop assembly includes a support, a lock buckle, the bottom of the lock buckle rotates with the support, a second spring is provided between the lock hook and the support, and lock hooks are provided at both ends of the bed board assembly. During the rising process of the bed board assembly, the lock hook pushes the lock buckle to squeeze the second spring. When it is in the raised position, the lock buckle is pushed out by the second spring and supported on the bottom of the lock hook.

[0011] Preferably, in order to facilitate unlocking, a push rod is provided inside the bed board assembly, and a handle is provided on the outside of the bed board assembly to drive the push rod to slide. The push rod is pushed out of the bottom of the bed board assembly, squeezing the lock buckle to release the bed board assembly.

[0012] Preferably, in order to facilitate the installation of the bed board assembly, a mounting seat is further included, and the first connecting rod, the second connecting rod and the first spring are connected to the wall through the mounting seat.

[0013] Preferably, in order to ensure synchronous movement of both ends of the bed board assembly, a synchronization rod is provided inside the bed board assembly, and both ends of the synchronization rod are connected to the hinge shaft of the second connecting rod.

[0014] Preferably, in order to ensure the safety of the user and prevent the bed board assembly from being too high and affecting the rising position, a guardrail is hinged on the outer side of the bed board assembly.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. The length of the connecting rod is reduced and the lifting stroke is increased: with the hinge point of the connecting rod and the wall as a reference, the bed board assembly can rise above the hinge point and fall below the hinge point, the lifting stroke is doubled, the length of the connecting rod is shortened, and the radius required for the rising and falling rotation of the bed board assembly is reduced, which is suitable for sleeper cars with limited space; 2. The rising and falling process is smooth and the bed board assembly remains horizontal without flipping or tilting, and will not cause items on the bed board assembly to fall; 3. There is no gap between the bed board assembly and the wall, and the use space is large: whether it is in the rising or lowering position, the bed board assembly can fit the wall, and there is no connecting rod blocking both ends of the bed board assembly to ensure the use space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the liftable berth bed of the present invention in the raised state;

[0017] Figure 2 It is a side view of the liftable berth bed of the present invention in the raised state;

[0018] Figure 3 This is the structural schematic diagram of the hinge assembly;

[0019] Figure 4 It is a side view of the liftable berth bed of the present invention in a lowered state;

[0020] Figure 5 It is a side sectional view of the liftable berth bed of the present invention in a lowered state;

[0021] Figure 6 It is a front cross-sectional view of the liftable berth bed of the present invention in a lowered state;

[0022] Figure 7 Schematic diagram of the lock gear assembly structure;

[0023] Figure 8 It is a cross-sectional view of the lock gear assembly structure. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0025] like Figures 1 to 3 A liftable sleeper bed primarily comprises a bed deck assembly 3 and hinge assemblies 1 and 2 that drive the deck assembly 3 up and down. The hinge assemblies 1 and 2 are located at either end of the deck assembly 3, one end hinged to the deck assembly 3 and the other end hinged to a mounting base 14, which is secured to the vehicle body. A mattress 4 is located on top of the deck assembly 3, with a guardrail hinged to the outside to prevent the user from falling off.

[0026] like Figure 3 The hinge assembly 1 / 2 is mainly composed of a connecting rod 15 and a connecting rod 16 of the same shape. The connecting rod 15 and the connecting rod 16 are respectively connected to the two sides of the support plate of the mounting seat 14. The connecting rod 15 is connected to the bed board assembly 3 through a rotating hinge axis B, and the connecting rod 16 is connected to the bed board assembly 3 through a rotating hinge axis A. The connecting rod 15 is connected to the mounting seat 14 through a rotating hinge axis D, and the connecting rod 16 is connected to the mounting seat 14 through a rotating hinge axis C, forming a set of parallelogram connecting rod mechanisms. By utilizing the parallelogram connecting rod mechanism and the eccentric arrangement of the connecting rods 15 and 16, the bed can always remain in a horizontal state during the lifting process, thereby avoiding the mattress 4 or other items placed on the bed board assembly 3 from falling during the lifting process, while ensuring that the bed board assembly can rise and fall, increasing the lifting stroke.

[0027] The connecting rods 15 and 16 are staggered a certain distance up and down and left and right. Specifically, the connecting rod 15 is located between the connecting rod 16 and the bed board assembly 3. The height of the connecting rod 15 is lower than that of the connecting rod 16. By lowering the height of the connecting rod 15, the dead point line between the hinge shafts A, B, C, and D is transferred to outside the position of the entire process of bed rising and falling, thereby avoiding the hinge shaft being located on the dead point line during the falling and rising process of the bed board assembly 3, causing the bed board assembly 3 to get stuck or become unstable and unable to move normally.

[0028] The ends of the connecting rods 15 and 16 near the bed board assembly 3 are bent, i.e., the connecting rods 15 and 16 are both L-shaped. This bend not only provides more space for the bed board assembly 3, but also frees up space for the hinge axis A between the connecting rod 16 and the bed board assembly 3, allowing the bed board assembly 3 to fit more closely against the wall when in the lowered position, thereby reducing the gap between the bed board assembly 3 and the wall. The ends of the connecting rods 15 and 16 near the mounting base 14 are slightly bent, allowing the connecting rods 15 and 16 to be hidden within the mounting base 14 after the bed board assembly 3 is lowered.

[0029] A spring 17 is provided between the top of the mounting seat 14 and the connecting rod 15 or the connecting rod 16. The spring 17 forms a damping device to balance the influence of the gravity moment of the bed board assembly 3 and the mattress 4. The lifting action of the bed board assembly 3 can be achieved with a relatively small operating force, and it also prevents the bed board assembly 3 from being affected by gravity during descent and falling too fast to hit the operator.

[0030] like Figure 4 、 Figure 5 A synchronization rod 10 is installed between hinge assembly 1 and hinge assembly 2 at each end of bed deck assembly 3 to ensure consistent hinge movement during bed raising and lowering. Synchronization rod 10 is located within bed deck assembly 3, with its ends connected to the hinge axis of hinge shaft B. A cover 7 / 8 is located outside mounting base 14 to shield the internal components of the hinge assembly and protect the user from damage.

[0031] A support assembly 9 is provided below the mounting seat 14 . When the hinge shafts A and B rotate to below the hinge shafts C and D, that is, when the bed board assembly 3 is in the lowered position, both ends and the inner side of the bed board assembly 3 are placed on the support assembly 9 .

[0032] A locking assembly 5 / 6 is provided above the mounting seat 14, and the locking assembly includes a lock buckle 11. The bottom end of the lock buckle 11 is rotatably connected to the vehicle body through a support. A torsion spring is provided between the lock buckle 11 and the support to keep the top of the lock buckle 11 away from the support. Lock hooks 12 are provided at both ends of the bed board assembly 3. When the hinge shafts A and B rotate to above the hinge shafts C and D, that is, when the bed board assembly 3 is in the raised position, the lock hooks 12 are located at the upper end of the lock buckle 11 to prevent the bed board assembly 3 from falling.

[0033] A push rod 13 parallel to the synchronization rod 10 is provided in the bed board assembly 3, and a rotating handle 18 is connected to the outside of the bed board assembly 3. The handle 18 is used to drive the push rod 13 to slide left and right. By rotating the handle, the push rods 13 at both ends of the bed board assembly 3 are driven to slide out at the same time. The push rod 13 pushes the lock buckle 11 to rotate, compresses the torsion spring, and releases the lock hook 12, so that the bed board assembly 3 can be lowered.

[0034] When the berth is not in use, it can be raised outside the passenger area. When it is needed, it can be lowered to the sleeping position. The liftable berth is equipped with a damping device, making it easy and labor-saving to operate. This solution provides more flexible space utilization within the vehicle. Compared to existing flip berths, the liftable berth moves more smoothly, eliminating the worry of items falling from the bed and providing a better user experience.

Claims

1. A liftable berth bed, comprising a bed board assembly (3), characterized in that: The two ends of the bed board assembly (3) are connected to the wall through a hinge assembly, the hinge assembly includes a first connecting rod (16) and a second connecting rod (15), the second connecting rod (15) is located between the first connecting rod (16) and the bed board assembly (3), the hinge axis of the first connecting rod (16), the second connecting rod (15) and the bed board assembly (3), and the hinge axis of the first connecting rod (16), the second connecting rod (15) and the wall together form a parallelogram; and also includes a locking assembly (5) for fixing to the wall, the locking assembly includes a support, a lock (11), the bottom of the lock and the support are connected The bed board assembly (3) is rotated, and a second spring is provided between the lock catch and the support. Lock hooks (12) are provided at both ends of the bed board assembly. During the rising process of the bed board assembly (3), the lock hook (12) pushes the lock catch (11) to squeeze the second spring. When the bed board assembly (3) is in the rising position, the lock catch (11) is pushed out by the second spring and supported at the bottom of the lock hook (12), thereby locking the bed board assembly (3). A push rod (13) is provided inside the bed board assembly (3), and a handle (18) for driving the push rod to slide is provided on the outside of the bed board assembly (3). The push rod is pushed out of the bottom of the bed board assembly (3), squeezing the lock catch (11) and releasing the bed board assembly.

2. The adjustable berth bed according to claim 1, characterized in that: The height of the second connecting rod (15) is lower than the height of the first connecting rod (16).

3. The adjustable berth bed according to claim 2, characterized in that: One end of the first connecting rod (16), the second connecting rod (15) and the bed board assembly (3) that is hinged is bent.

4. The adjustable berth bed according to claim 1, characterized in that: An end of the first connecting rod (16) or the second connecting rod (15) close to the wall is provided with a first spring (17) for connecting to the wall.

5. The adjustable berth bed according to claim 1, characterized in that: It also includes a support member (9) for connecting to a wall, and when the bed board assembly (3) is in the lowered position, the support member (9) supports the bottom of the bed board assembly (3).

6. The adjustable berth bed according to claim 4, characterized in that: It also includes a mounting seat (14), and the first connecting rod (16), the second connecting rod (15), and the first spring (17) are connected to the wall through the mounting seat.

7. The adjustable berth bed according to claim 1, characterized in that: A synchronization rod (10) is provided inside the bed plate assembly (3), and both ends of the synchronization rod (10) are connected to the hinge shaft of the second connecting rod (15).

8. The adjustable berth bed according to claim 1, characterized in that: A guardrail is hingedly connected to the outer side of the bed board assembly (3).

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