Dual-purpose seat for sitting and lying

Abstract

The invention discloses a sitting and lying dual-purpose seat. The sitting and lying dual-purpose seat comprises a headrest, a back cushion, a seat cushion and a base which are sequentially connected from top to bottom, the back cushion is located on the back cushion frame assembly, the seat cushion is located on the seat cushion frame assembly, and the seat cushion frame assembly is fixed to the base through a guide rail. One end of the back cushion frame assembly is connected with the seat cushion frame through a built-in displacement sliding groove structure, the back cushion frame assembly is connected with the swing rod assembly, and a lock assembly is arranged on the seat cushion frame. The device is simple in structure and easy to operate, and improves travel comfort, reliability, safety and operation convenience.

Description

Technical Field

[0001] This invention relates to the field of rail transportation, and more particularly to a seat that can be used for sitting or reclining. Background Technology

[0002] With my country's rapid economic development, the railway industry has ushered in a new leap forward, and trains have become the preferred mode of transportation for long-distance travel. Currently, train seats and sleeper berths are generally located in separate carriages, catering to different travel needs. Seats are suitable for short-distance travel, and carriages with seats can accommodate up to 100 passengers, making high space utilization. Sleeper berths, on the other hand, are suitable for long-distance travel, but each train can accommodate fewer passengers, resulting in lower utilization. Currently, to increase train capacity during certain peak periods, sleeper berths are often used as seats, thereby increasing the number of passengers carried per train. If sleeper berths could be converted into seats quickly and easily, it would indeed be a good option.

[0003] Patents CN202510671602.8, CN202122945938.9, and CN202010562569.2 all propose a sitting-to-lying conversion scheme, but all require the use of a tea table to connect the opposing seats, involving many components and relatively complex operation steps. Patent CN202510633157.6 proposes a convertible sleeper berth for both sitting and lying down, but this backrest rotation scheme has the problem of a small seat depth in the seated state, greatly reducing the comfort of short-distance travel. Patent CN202221108322.4 proposes a train sleeper berth for both sitting and lying down, but the unlocking method of the berth is relatively complex, and the reliability of the rotatable limiting structure of the second berth in the seated state is not high. Moreover, patents CN202510633157.6 and CN202221108322.4, which involve backrest rotation, both use an external hinge scheme for the seat and backrest cushions, posing a great risk of pinching hands. In addition, the aforementioned patent does not include a retaining structure for the sleeper berth, so safety needs to be improved. Summary of the Invention

[0004] Purpose of the invention: To address the shortcomings and defects of existing technologies, this invention provides a seat that can be used for both sitting and reclining. It has a simple structure, is easy to operate, and improves travel comfort, reliability, safety, and ease of use.

[0005] Technical solution: The present invention provides a seat that can be used for sitting or reclining, characterized in that it includes a headrest, a backrest, a seat cushion, and a base connected sequentially from top to bottom; the backrest is located on a backrest frame assembly, the seat cushion is located on a seat cushion frame assembly, and the seat cushion frame assembly is fixed to the base via a guide rail; one end of the backrest frame assembly is connected to the seat cushion frame via an internal displacement sliding groove structure, the backrest frame assembly is connected to a swing arm assembly, and a locking assembly is provided on the seat cushion frame.

[0006] The cushion frame assembly includes a cushion frame, a limiting block, a connecting shaft, and a sliding shaft; the cushion frame is provided with a limiting block, and the connecting shaft is connected to the sliding shaft.

[0007] The cushion frame assembly includes a backrest frame, a sliding groove, and an auxiliary self-resetting support rod. The backrest frame is provided with a sliding groove and an auxiliary self-resetting support rod.

[0008] The connecting shaft is connected to the auxiliary self-resetting support rod, and the axial force of the auxiliary self-resetting support rod always points towards the cushion frame assembly, while the sliding shaft moves within the slide groove.

[0009] The swing arm assembly includes an upper support, an upper rotating shaft, a swing arm, a lower rotating shaft, a lower support, and a swing arm self-resetting support rod; the lower support and the swing arm self-resetting support rod are connected to the base.

[0010] The upper support, upper pivot, swing arm, lower pivot, and lower support are connected in sequence; one end of the swing arm assembly is connected to the cushion frame assembly through the upper support, and the other end of the swing arm assembly is fixed to the base through the lower support, thus limiting the movement trajectory of the cushion frame assembly.

[0011] When the swing arm restricts the downward movement of the cushion frame assembly, the swing arm self-resetting support rod slows down the downward speed of the cushion frame. When the swing arm restricts the upward movement of the cushion frame, the swing arm self-resetting support rod assists in the upward speed of the cushion frame, thereby achieving the effects of buffering and noise reduction or assisting in lifting.

[0012] The lock assembly includes a handle, a lock housing, a lock hook, a lock stop, and a lock hook pivot. The lock stop is fixed to the base, the lock housing is fixed to the seat frame assembly, and the handle and lock hook are both connected to the lock housing. In the locked state, the lock hook and lock stop are interlocked, and the seat frame assembly and the base are relatively stationary.

[0013] During the unlocking process of converting the seat into a sleeper berth, pulling the handle of the locking assembly pushes the locking hook to rotate around the locking hook axis. At this time, the locking hook tilts upward and is no longer engaged with the locking stop, thereby pulling the seat cushion frame assembly forward. The sliding shaft then contacts one end of the slide groove, and the seat cushion frame assembly can drive the backrest frame assembly to fall synchronously. After the seat cushion frame assembly moves to its limit position and stops, manually pressing down on the backrest frame assembly moves the sliding shaft to the other end of the slide groove until the limit block of the backrest frame assembly contacts the base. At this time, the height of the center line of the upper rotating shaft of the swing arm assembly is lower than that of the lower rotating shaft, and the swing arm assembly is in the "over-dead point" holding structure. Pushing the seat cushion frame assembly in the opposite direction cannot cause the backrest frame assembly to rise and reset.

[0014] In the process of converting a sleeper berth into a seat, the backrest frame assembly is first lifted upwards, the sliding shaft moves in the opposite direction along the slide groove, and drives the swing arm to rotate upwards until the center line of the upper rotating shaft of the swing arm assembly is higher than the lower rotating shaft, and the swing arm assembly is disengaged from the "over-dead point" holding structure area. After that, the cushion frame assembly is lifted upwards or the seat cushion frame assembly is pushed in the opposite direction until the locking hook contacts the locking stop. The locking hook will automatically rotate upwards around the locking hook rotating shaft axis. After the seat cushion frame assembly continues to move a certain distance, the locking hook falls in the opposite direction and hooks and locks with the locking stop, thus resetting to the seat state.

[0015] Beneficial Effects: Compared with the prior art, the present invention has the following significant advantages: The present invention adopts a rolling guide rail and a rocker arm assembly with a power assist structure, which can greatly reduce the operating force for switching between sitting and lying positions and improve the ease of operation; the seat cushion frame and backrest frame adopt an internal displacement sliding groove structure to achieve associated movement, replacing the hinge structure installed on both sides of the conventional seat, avoiding the risk of hand pinching by exposed hinges, and improving aesthetics and safety; the seat position adopts a double locking structure, which only requires manually unlocking the main lock and moving the seat cushion frame to realize the conversion from seat position to lying position, without the need for additional operation to unlock the auxiliary lock; the lying position adopts a rocker arm assembly "over-dead point" holding structure. When the axial force of the auxiliary self-resetting support rod and other external forces push the seat cushion frame to reset, the "over-dead point" structure can cause the rocker arm to have a downward movement tendency, always maintaining the lying position.

[0016] This invention utilizes a concealed displacement sliding groove structure to connect the seat cushion frame and backrest frame, enabling them to move in tandem when switching between sitting and reclining positions. This simplifies operation and replaces the conventional hinge structure installed on both sides of the seat, avoiding the risk of fingers being pinched by exposed hinges. It offers both aesthetic appeal and high safety. The seat position employs a double locking structure. The locking components, hook and stop, are respectively fixed to the seat cushion frame and base. The interlocking of the hook and stop keeps the seat cushion frame relatively stationary with respect to the base. The self-resetting support rod of the swing arm pushes the backrest frame to maintain its upward position, thus forming the main locking structure. The axial force of the auxiliary self-resetting support rod of the seat cushion frame always points towards the backrest frame. Compared to the self-resetting support rod of the swing arm, its lever arm about the upper pivot center is larger, generating a large torque effect to push the swing arm to rotate upwards, thus forming an auxiliary locking structure that maintains the seat position. During unlocking, simply pull the handle of the locking assembly to unlock the main lock and pull the seat cushion frame. Since the auxiliary lock's lever arm gradually decreases, no additional unlocking operation is needed, thus converting the seat to a sleeper position. The entire unlocking operation is simple and reliable. The sleeper position utilizes a "dead-end" holding structure, where the center line of the upper pivot of the swing arm is lower than the lower pivot. Because the axial force of the auxiliary self-resetting support rod and other forces pushing the seat cushion frame to reset are directed towards the backrest frame, the swing arm exhibits a downward rotational tendency, causing the limit block to contact the base more tightly, maintaining the current sleeper position. The swing arm assembly is connected to the backrest frame, not only constraining the movement trajectory of the backrest frame but also using the swing arm's self-resetting support rod to buffer and reduce noise when the backrest frame falls, as well as providing reverse assistance in raising the backrest frame, making the operation effortless and quiet. A rolling slide rail connects the seat cushion frame and the base; rolling friction reduces frictional resistance during the seat cushion frame's forward and backward movement, improving operational convenience. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the seat configuration of the present invention;

[0018] Figure 2 This is a schematic diagram of the sleeper configuration of the present invention;

[0019] Figure 3 This is a structural diagram of the seat configuration of the present invention (with the seat cushion and backrest hidden).

[0020] Figure 4 This is a structural diagram of the sleeper configuration of the present invention (with the seat cushion and backrest cushion hidden).

[0021] Figure 5 This is a schematic diagram of the structure of the cushion holder assembly of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the seat cushion frame assembly of the present invention;

[0023] Figure 7 This is a schematic diagram of the assembly structure of the sliding shaft and the sliding groove of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of the swing arm assembly of the present invention;

[0025] Figure 9 This is a schematic diagram of the interlocking locking state of the locking assembly of the present invention;

[0026] Figure 10 This is a schematic diagram of the unlocked state of the lock component of the present invention;

[0027] Figure 11 This is a schematic diagram of the first stage of the coordinated motion of the present invention;

[0028] Figure 12 This is a schematic diagram of the second stage of the cooperative motion of the present invention;

[0029] Figure 13 A schematic diagram illustrating the structure for maintaining the "over-dead point" state in the sleeper position according to the present invention;

[0030] In the diagram, 1 is a headrest; 2 is a backrest; 3 is a seat cushion; 4 is a base; 5 is a backrest frame assembly; 6 is a seat cushion frame assembly; 7 is a guide rail; 8 is a swing arm assembly; 9 is a lock assembly; 501 is a backrest frame; 502 is a limit block; 503 is a connecting shaft; 504 is a sliding shaft; 601 is a backrest frame; 602 is a slide groove; 603 is an auxiliary self-resetting support rod; 801 is an upper support; 802 is an upper rotating shaft; 803 is a swing arm; 804 is a lower rotating shaft; 805 is a lower support; 806 is a swing arm self-resetting support rod; 901 is a handle; 902 is a lock housing; 903 is a lock hook; 904 is a lock stop; 905 is a lock hook rotating shaft. Detailed Implementation

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] The present invention provides a reclining chair that can be used for sitting or lying down, comprising a headrest 1, a backrest 2, a seat cushion 3, and a base 4 connected sequentially from top to bottom; the backrest 2 is located on a backrest frame assembly 5, the seat cushion 3 is located on a seat cushion frame assembly 6, and the seat cushion frame assembly 6 is fixed to the base 4 via a guide rail 7; one end of the backrest frame assembly 5 is connected to the seat cushion frame 6 via a concealed displacement sliding groove structure, the backrest frame assembly 5 is connected to a swing arm assembly 8, and the seat cushion frame 6 is provided with a locking assembly 9.

[0033] The cushion holder assembly 5 of the present invention includes a cushion holder 501, a limiting block 502, a connecting shaft 503 and a sliding shaft 504; the cushion holder 501 is provided with the limiting block 502, and the connecting shaft 503 is connected to the sliding shaft 504.

[0034] The cushion frame assembly 6 of the present invention includes a backrest frame 601, a sliding groove 602, and an auxiliary self-resetting support rod 603. The backrest frame 601 is provided with the sliding groove 602 and the auxiliary self-resetting support rod 603. The connecting shaft 503 is connected to the auxiliary self-resetting support rod 603, and the axial force of the auxiliary self-resetting support rod 603 always points towards the backrest frame assembly 5. The sliding shaft 504 moves within the sliding groove 602.

[0035] The rocker arm assembly 8 of the present invention includes an upper support 801, an upper rotating shaft 802, a rocker arm 803, a lower rotating shaft 804, a lower support 805, and a rocker arm self-resetting support rod 806; the lower support 805 and the rocker arm self-resetting support rod 806 are connected to the base 4. The upper support 801, upper rotating shaft 802, rocker arm 803, lower rotating shaft 804, and lower support 805 are connected in sequence; one end of the rocker arm assembly 8 is connected to the cushion frame assembly 5 through the upper support 801, and the other end of the rocker arm assembly 8 is fixed to the base 4 through the lower support 805. The rocker arm assembly 8 restricts the movement trajectory of the cushion frame assembly 5. When the rocker arm 803 restricts the downward movement of the cushion frame assembly 5, the rocker arm self-resetting support rod 806 slows down the downward speed of the cushion frame 5, and when the rocker arm 803 restricts the upward movement of the cushion frame 5, the rocker arm self-resetting support rod 806 assists in the upward speed of the cushion frame 5, thereby achieving the functions of buffering and noise reduction or assisting in lifting.

[0036] The locking assembly 9 of the present invention includes a handle 901, a lock housing 902, a lock hook 903, a lock stop 904, and a lock hook pivot 905; the lock stop 904 is fixed on the base 4, the lock housing 902 is fixed on the seat cushion assembly 6, and the handle 901 and the lock hook 903 are both connected to the lock housing 902; in the locked state, the lock hook 903 and the lock stop 904 hook and lock each other, and the seat cushion assembly 6 and the base 4 are relatively stationary.

[0037] During the unlocking process of converting the seat into a sleeper berth, after pulling the handle 901 of the locking assembly 9, the handle 901 pushes the locking hook 903 to rotate around the axis of the locking hook pivot 905. At this time, the locking hook 903 tilts upward and is no longer hooked with the locking stop 904, thereby pulling the seat cushion assembly 6 forward. The sliding shaft 504 is in contact with one end of the slide groove 601 at this time, and the seat cushion assembly 6 can drive the backrest assembly 5 to fall synchronously. After the seat cushion assembly 6 moves to the limit position and stops, manually press down on the backrest assembly 5, and the sliding shaft 504 moves to the other end of the slide groove 601 until the limit block 502 of the backrest assembly 5 contacts the base 4. At this time, the height position of the center line of the upper pivot 802 of the swing arm assembly is lower than that of the lower pivot 804. The swing arm assembly 8 is in the "over-dead point" holding structure, and pushing the seat cushion assembly 6 in the opposite direction cannot cause the backrest assembly 5 to rise and reset.

[0038] During the process of converting the sleeper berth into a seat, the backrest frame assembly 5 is first lifted upwards, the sliding shaft 504 moves in the opposite direction along the slide groove 601, and drives the swing arm 803 to rotate upwards until the center line of the upper rotating shaft 802 of the swing arm assembly is higher than the lower rotating shaft 804, and the swing arm assembly 8 is disengaged from the "over-dead point" holding structure area; thereafter, the cushion frame assembly 5 is lifted upwards or the seat cushion frame assembly 6 is pushed in the opposite direction until the locking hook 903 contacts the locking stop 904. The locking hook 903 will automatically rotate upwards around the axis of the locking hook rotating shaft 905. After the seat cushion frame assembly 6 continues to move a certain distance, the locking hook 903 falls in the opposite direction and hooks and locks with the locking stop 904, thus resetting to the seat state.

[0039] The above example illustrates a single-person seat implementation plan. By moving the seat cushion forward and lowering the entire backrest (including the headrest), the fore-and-aft distance is increased, thus enabling the switching between sitting and reclining positions. This structure can also be applied to multi-person seats, where the lateral length of the existing seat is increased to three times. The seat backrest can be designed as a two-piece mechanism, where moving the seat cushion forward only requires simultaneously lowering the lower part of the backrest, thereby increasing the seat depth and converting the seat into a single-person berth.

[0040] This invention employs a rolling guide rail and a swing arm assembly with a power assist structure, which significantly reduces the operational force required for switching between sitting and reclining positions, improving ease of operation. The seat and backrest frames utilize a concealed displacement sliding groove structure to achieve interconnected movement, replacing the hinge structure installed on both sides of the conventional seat. This avoids the risk of fingers being pinched by exposed hinges, improving aesthetics and safety. The seat position employs a double locking structure; simply unlocking the main lock and moving the seat frame is sufficient to switch from seat to reclining position, without requiring additional unlocking of the auxiliary lock. In reclining position, the swing arm assembly uses a "dead-end point" holding structure. When the axial force of the auxiliary self-resetting support rod and other external forces push the seat frame to reset, the "dead-end point" structure causes the swing arm to move downwards, maintaining the reclining position at all times.

[0041] This invention utilizes a concealed displacement sliding groove structure to connect the seat cushion frame and backrest frame, enabling them to move in tandem when switching between sitting and reclining positions. This simplifies operation and replaces the conventional hinge structure installed on both sides of the seat, avoiding the risk of fingers being pinched by exposed hinges. It offers both aesthetic appeal and high safety. The seat position employs a double locking structure. The locking components, hook and stop, are respectively fixed to the seat cushion frame and base. The interlocking of the hook and stop keeps the seat cushion frame relatively stationary with respect to the base. The self-resetting support rod of the swing arm pushes the backrest frame to maintain its upward position, thus forming the main locking structure. The axial force of the auxiliary self-resetting support rod of the seat cushion frame always points towards the backrest frame. Compared to the self-resetting support rod of the swing arm, its lever arm about the upper pivot center is larger, generating a large torque effect to push the swing arm to rotate upwards, thus forming an auxiliary locking structure that maintains the seat position. During unlocking, simply pull the handle of the locking assembly to unlock the main lock and pull the seat cushion frame. Since the auxiliary lock's lever arm gradually decreases, no additional unlocking operation is needed, thus converting the seat to a sleeper position. The entire unlocking operation is simple and reliable. The sleeper position utilizes a "dead-end" holding structure, where the center line of the upper pivot of the swing arm is lower than the lower pivot. Because the axial force of the auxiliary self-resetting support rod and other forces pushing the seat cushion frame to reset are directed towards the backrest frame, the swing arm exhibits a downward rotational tendency, causing the limit block to contact the base more tightly, maintaining the current sleeper position. The swing arm assembly is connected to the backrest frame, not only constraining the movement trajectory of the backrest frame but also using the swing arm's self-resetting support rod to buffer and reduce noise when the backrest frame falls, as well as providing reverse assistance in raising the backrest frame, making the operation effortless and quiet. A rolling slide rail connects the seat cushion frame and the base; rolling friction reduces frictional resistance during the seat cushion frame's forward and backward movement, improving operational convenience.

Claims

1. A reclining chair, characterized in that: It includes a headrest (1), a backrest (2), a seat cushion (3), and a base (4) connected from top to bottom; the backrest (2) is located on the backrest frame assembly (5), the seat cushion (3) is located on the seat cushion frame assembly (6), and the seat cushion frame assembly (6) is fixed to the base (4) by a guide rail (7); one end of the backrest frame assembly (5) is connected to the seat cushion frame (6) through a concealed displacement sliding groove structure, the backrest frame assembly (5) is connected to the swing arm assembly (8), and the seat cushion frame (6) is provided with a locking assembly (9).

2. The reclining chair according to claim 1, characterized in that: The cushion frame assembly (5) includes a cushion frame (501), a limiting block (502), a connecting shaft (503), and a sliding shaft (504); the cushion frame (501) is provided with a limiting block (502), and the connecting shaft (503) is connected to the sliding shaft (504).

3. The reclining chair according to claim 2, characterized in that: The cushion frame assembly (6) includes a backrest frame (601), a slide groove (602) and an auxiliary self-resetting support rod (603). The backrest frame (601) is provided with a slide groove (602) and an auxiliary self-resetting support rod (603).

4. The reclining chair according to claim 3, characterized in that: The connecting shaft (503) is connected to the auxiliary self-resetting support rod (603), and the axial force of the auxiliary self-resetting support rod (603) always points towards the cushion frame assembly (5), and the sliding shaft (504) moves in the slide groove (602).

5. The reclining chair according to claim 1, characterized in that: The swing arm assembly (8) includes an upper support (801), an upper rotating shaft (802), a swing arm (803), a lower rotating shaft (804), a lower support (805), and a swing arm self-resetting support rod (806); the lower support (805) and the swing arm self-resetting support rod (806) are connected to the base (4).

6. The reclining chair according to claim 5, characterized in that: The upper support (801), upper rotating shaft (802), swing rod (803), lower rotating shaft (804), and lower support (805) are connected in sequence; one end of the swing rod assembly (8) is connected to the cushion frame assembly (5) through the upper support (801), and the other end of the swing rod assembly (8) is fixed to the base (4) through the lower support (805). The swing rod assembly (8) restricts the movement trajectory of the cushion frame assembly (5).

7. The reclining chair according to claim 6, characterized in that: When the swing arm (803) restricts the downward movement of the cushion frame assembly (5), the swing arm self-resetting support rod (806) slows down the downward speed of the cushion frame (5). When the swing arm (803) restricts the upward movement of the cushion frame (5), the swing arm self-resetting support rod (806) assists the upward speed of the cushion frame (5), thereby achieving the effects of buffering and noise reduction or assisting in lifting.

8. The reclining chair according to claim 1, characterized in that: The lock assembly (9) includes a handle (901), a lock housing (902), a lock hook (903), a lock stop (904), and a lock hook pivot (905); the lock stop (904) is fixed on the base (4), the lock housing (902) is fixed on the seat frame assembly (6), and the handle (901) and the lock hook (903) are both connected to the lock housing (902); in the locked state, the lock hook (903) and the lock stop (904) are locked together, and the seat frame assembly (6) and the base (4) are relatively stationary.

9. The reclining chair according to any one of claims 1-8, characterized in that: During the unlocking process of converting the seat into a sleeper berth, after pulling the handle (901) of the locking assembly (9), the handle (901) pushes the locking hook (903) to rotate around the axis of the locking hook pivot (905). At this time, the locking hook (903) tilts upward and is no longer hooked with the locking stop (904), thereby pulling the seat cushion assembly (6) forward. The sliding shaft (504) is in contact with one end of the slide groove (601) at this time, and the seat cushion assembly (6) can drive the backrest assembly (5) to fall synchronously. (6) After the movement reaches the limit position and stops, manually press down on the backrest frame assembly (5). The sliding shaft (504) moves to the other end of the slide groove (601) until the limit block (502) of the backrest frame assembly (5) contacts the base (4). At this time, the height of the center line of the upper rotating shaft (802) of the swing arm assembly is lower than that of the lower rotating shaft (804). The swing arm assembly (8) is in the "over-dead point" holding structure. Pushing the seat cushion assembly (6) in the opposite direction cannot cause the backrest frame assembly (5) to rise and reset.

10. The reclining chair according to claim 9, characterized in that: During the process of converting the sleeper into a seat, the backrest frame assembly (5) is first lifted upwards, the sliding shaft (504) moves in the opposite direction along the slide groove (601), and drives the swing arm (803) to rotate upwards until the center line of the upper rotating shaft (802) of the swing arm assembly is higher than the lower rotating shaft (804), and the swing arm assembly (8) is disengaged from the "over-dead point" holding structure area; thereafter, the backrest frame assembly (5) is lifted upwards or the seat cushion assembly (6) is pushed in the opposite direction until the locking hook (903) contacts the locking stop (904). The locking hook (903) will automatically rotate upwards around the axis of the locking hook rotating shaft (905). After the seat cushion assembly (6) continues to move a certain distance, the locking hook (903) falls in the opposite direction and hooks and locks with the locking stop (904), thus resetting to the seat state.

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