Patent Application
20250040707
The present disclosure claims the priority of Chinese Patent Application No. 202322065785.8 filed on Aug. 2, 2023 before CNIPA. All the above are hereby incorporated by reference in their entirety.
The present disclosure relates to a mechanical stretching device for movable seat unit and a seat unit including the same.
A variety of seating units for movable seat devices, such as rocking chairs, swinging chairs, and sofas having a rocking function, are well known in the prior art. The seat unit typically has a base assembly, a seat assembly, a backrest assembly, and a leg extension device. The seat unit is capable of switching between two or three of a sitting position, a relaxing position and a lying position. The known seat units often employ a single-motor type electrically actuated unit acting between the backrest assembly and the leg stretching device to achieve multiple position changes of the seat unit. However, the disadvantages of the design are that, on the one hand, the mechanical stretching device has a large number of parts and complex connection relationships, which require high manufacturing and assembly processes, and on the other hand, the electrically actuated unit is arranged between the backrest assembly and the leg stretching device, which is also responsible for the position change of the two assemblies, so that undesired situations, such as stagnation, may occur in the working stroke of the electrically actuated unit.
The technical problem to be solved in the present disclosure is to provide a seat unit of simpler structure, easier operation and lower manufacturing cost.
In the present disclosure, the “front-back direction” is in terms of an extension direction of the leg stretching device of the seat unit or the mechanical stretching device, and specifically, the “front” refers to a direction facing the leg stretching device, and the “back” refers to a direction facing the backrest.
In order to solve the aforementioned technical problems, provided in the present disclosure is a mechanical stretching device for movable seat unit, in which the mechanical stretching device includes: a seat support, arranged to attach to a seat; a leg stretching device, pivoted at a front part of the seat support; a backrest support, pivoted at a rear part of the seat support; and an electrically actuated unit, including a leg electrically actuated device for folding and unfolding of the leg stretching device and a backrest electrically actuated device for backward reclining or forward resetting of the backrest support.
In accordance with the present disclosure, the mechanical stretching device is directly switched at least between a sitting position and a lying position, the leg stretching device is folded below the seat support in the sitting position, the leg stretching device is lifted forwards and upwards and the backrest support is reclining backwards in the lying position, stretching of the leg stretching device and backward reclining of the backrest support are performed simultaneously through the electrically actuated unit when the mechanical stretching device is switched from the sitting position to the lying position, and unfolding of the leg stretching device and forward resetting of the backrest support are performed simultaneously when the mechanical stretching device is switched from the lying position to the sitting position.
In a preferable implementation, the mechanical stretching device is directly switched between the sitting position and a relaxing position, when in the relaxing position, the leg stretching device is lifted forwards and upwards, and a relative position between the backrest support and the seat support is kept to be the same in the sitting position.
In a preferable implementation, the mechanical stretching device is sequentially switched from the sitting position to the lying position and then to the relaxing position by means of the electrically actuated unit. Separate controls for the leg stretching device and the backrest assembly are achieved by means of the electrically actuated unit, in which the leg electrically actuated device only controls the folding and unfolding of the leg stretching device, and the backrest electrically actuated device only controls the backward reclining and forward resetting of the backrest support. By means of the cooperation between the leg electrically actuated device and the backrest electrically actuated device, the backrest assembly or, specifically, the backrest support is unable to reclined backwards when the leg stretching device is not carried out an unfolding. In such an arrangement, a variety of operating modes of the mechanical stretching device are achieved. In an operating mode, the mechanical stretching device is directly switched from the sitting position to the lying position; in a second operating mode, the mechanical stretching device is switched from the lying position to the relaxing position; in a third operating mode, the mechanical stretching device is switched from the sitting position to the relaxing position; in a fourth operating mode, the mechanical stretching device is switched from the relaxing position to the sitting position; and in a fifth operating mode, the mechanical stretching device is directly reset from any intermediate position between the sitting position and the lying position to the sitting position.
In a preferable implementation, the leg electrically actuated device acts between the leg stretching device and the seat support, and the backrest electrically actuated device acts between the backrest support and the seat support.
Further and preferably, a leg crossbar is rigidly connected to the leg stretching device, a seat crossbar is rigidly connected to the seat support, an end of the leg electrically actuated device is pivoted to the leg crossbar, an opposite end of the leg electrically actuated device is pivoted to the seat crossbar, and the leg electrically actuated device drives the leg crossbar to move away from or close to the seat crossbar, so that the leg stretching device is unfolded or folded.
Further and preferably, a backrest crossbar is rigidly connected to the backrest support, an end of the backrest electrically actuated device is pivoted to the backrest crossbar, an opposite end of the backrest electrically actuated device is pivoted to the seat crossbar, the backrest electrically actuated device drives the backrest crossbar to move away from or close to the seat crossbar, so that the backrest support is reclined backwards or reset forwards.
In a preferable implementation, at least one of the leg electrically actuated device and the backrest electrically actuated device is a linear electric actuator. Preferably, the linear electric actuator may be a pusher motor or a slider motor.
In a preferable implementation, the mechanical stretching device further includes a base assembly for supporting the mechanical stretching device on the ground, the seat support is connected to the base assembly by means of a link mechanism, so as to swing in a front-back direction of the seat unit with respect to the base assembly.
Further and preferably, the link mechanism includes a swing base plate, a front swing rod, a back swing rod and a transmission connecting rod, respective upper end of both the front swing rod and back swing rod is pivoted to the swing base plate, respective lower end of both the front swing rod and back swing rod is pivoted to the transmission connecting rod, the swing base plate is fixedly connected to the base assembly, and the transmission connecting rod is connected to the seat support.
Further and preferably, the mechanical stretching device further includes a swing limit mechanism, in which the swing limit mechanism allows the seat support to swing with respect to the base assembly in the sitting position of the mechanical stretching device, and the swing limit mechanism prevents the seat support from swinging with respect to the base assembly in the relaxing position or the lying position of the mechanical stretching device.
Accordingly, the seat of the seat unit is prevented from swinging back and forth with respect to the base assembly when the leg stretching device is unfolded, which improves the safety of use.
Additionally, in order to solve the technical problem, provided in the present disclosure is further a movable seat unit, including: a seat, a backrest, a footrest member, and a mechanical stretching device, in which the mechanical stretching device includes: a seat support, arranged to attach to a seat; a leg stretching device, arranged to attach to the footrest, pivoted to a front part of the seat support; a backrest support, arranged to attach to the backrest, pivoted to a rear part of the seat support; and an electrically actuated unit, including a leg electrically actuated device for folding and unfolding of the leg stretching device and a backrest electrically actuated device for backward reclining or forward resetting of the backrest support, in which the seat unit is directly switched at least between a sitting position and a lying position, the leg stretching device is folded below the seat support in the sitting position, the footrest member is lifted forwards and upwards and the backrest is reclining backwards in the lying position, lifting up of the footrest member and backward reclining of the backrest are performed simultaneously through the electrically actuated unit when the seat unit is switched from the sitting position to the lying position, and recovery of the footrest member and forward resetting of the backrest are performed simultaneously by means of the electrically actuated unit when the seat unit is switched from the lying position to the sitting position.
In a preferable implementation, the seat unit is directly switched between the sitting position and a relaxing position, when in the relaxing position, the footrest member is lifted forwards and upwards, and a relative position between the backrest and the seat is kept to be the same in the sitting position.
In a preferable implementation, the seat unit is sequentially switched from the sitting position to the lying position and then to the relaxing position by means of the electrically actuated unit.
In a preferable implementation, the leg electrically actuated device acts between the leg stretching device and the seat support, and the backrest electrically actuated device acts between the backrest support and the seat support.
Further and preferably, a leg crossbar is rigidly connected to the leg stretching device, a seat crossbar is rigidly connected to the seat support, an end of the leg electrically actuated device is pivoted to the leg crossbar, an opposite end of the leg electrically actuated device is pivoted to the seat crossbar, and the leg electrically actuated device drives the leg crossbar to move away from or close to the seat crossbar, so that the leg stretching device is unfolded or folded.
Further and preferably, a backrest crossbar is rigidly connected to the backrest support, an end of the backrest electrically actuated device is pivoted to the backrest crossbar, an opposite end of the backrest electrically actuated device is pivoted to the seat crossbar, the backrest electrically actuated device drives the backrest crossbar to move away from or close to the seat crossbar, so that the backrest support is reclined backwards or reset forwards.
In a preferable implementation, at least one of the leg electrically actuated device and the backrest electrically actuated device is a linear electric actuator.
In a preferable implementation, a base assembly for supporting the mechanical stretching device on the ground, the seat support is connected to the base assembly by means of a link mechanism, so as to swing in a front-back direction of the seat unit with respect to the base assembly.
Further and preferably, the link mechanism includes a swing base plate, a front swing rod, a back swing rod and a transmission connecting rod, respective upper end of both the front swing rod and back swing rod is pivoted to the swing base plate, respective lower end of both the front swing rod and back swing rod is pivoted to the transmission connecting rod, the swing base plate is fixedly connected to the base assembly, and the transmission connecting rod is connected to the seat support.
Further and preferably, the mechanical stretching device further includes a swing limit mechanism, in which the swing limit mechanism allows the seat support to swing with respect to the base assembly in the sitting position of the seat unit, and the swing limit mechanism prevents the seat support from swinging with respect to the base assembly in the relaxing position or the lying position of the seat unit.
The following embodiments of the present disclosure are specifically described by means of the accompanying drawings.
It is shown exemplarily, according to
As shown in
In an implementation not shown, the base assembly may also be constructed as a circular support supported on the ground, in which a fixing support constituted by a set of parallel extended support rods is rotatably connected on the circular support, and the fixing support is arranged to movably support the mechanical stretching device above the ground.
The seat assembly 2 includes a seat support 21 arranged to attach to a seat, and a swing base plate 22 on the longitudinal support 11 fixedly attached to the base assembly 1, in which the seat support 21 is movably connected to the base assembly through a link mechanism. Specifically, the seat support 21 may swing with respect to a front-back direction of the base assembly 1. The link mechanism includes the swing base plate 22, a front swing rod 23, a back swing rod 24, and a transmission connecting rod 25. A bottom of the swing base plate 22 is fixedly connected to the longitudinal support 11, a front end of a top of the swing base plate 22 is pivoted to the a top end of the front swing rod 23, a back end of a top of the swing base plate 22 is pivoted to a top end of the back swing rod 24, a lower end of the front swing rod 23 and a lower end of the back swing rod 24 are pivoted to the longitudinally extended transmission connecting rod 25 respectively, a front end of the transmission connecting rod 25 is extended upwards and is fixedly connected to a front end of the seat support 21, and an additional connecting rod 26 is fixedly connected between a back end of the transmission connecting rod 25 and the seat support 21. In such an arrangement, the front swing rod 23 and the back swing rod 24 swing around their respective pivot points with the swing base plate 22, which drives the transmission connecting rod 25 and the seat support 21 to swing with respect to a front-back direction of the base assembly 1.
As shown in
The backrest assembly 4 includes a backrest support 41 pivoted to the seat support 21. The seat support 41 is constructed with a horizontal segment 41a extending substantially horizontally and a vertical segment 41b extending substantially vertically in the sitting position. In the present implementation, a forward-directed free end of the horizontal segment 41a of the backrest support 41 is pivoted to the seat support 21 at the backrest pivot point 45. Additionally, a backrest crossbar 44 is provided between backrest supports 41 on the left and right sides, and the backrest crossbar 44 is fixedly connected to a transition part between the horizontal segment 41a and the vertical segment 41b of the backrest support 41 by means of the backrest connecting member 43.
The mechanical stretching device includes an electrically actuated unit 5, including a leg electrically actuated device 51 for folding and unfolding of the leg stretching device 3 and a backrest electrically actuated device 52 for backward reclining or forward resetting of the backrest support 41. The leg electrically actuated device 51 acts between the leg stretching device 3 and the seat support 2, and the backrest electrically actuated device 52 acts between the backrest assembly 4 and the seat support 2.
The electrically actuated unit 5 is constructed as a linear motor, and the leg electrically actuated device 51 and the backrest electrically actuated device 52 both have a motor head and an actuated part that is displaceable with respect to the motor head, so as to achieve a change in the position of the leg stretching device and the backrest support by means of a change in the distance between the motor head and the corresponding actuated part. In the present implementation, the leg electrically actuated device 51 is designed as a slider motor, and the backrest electrically actuated device 52 is designed as a pusher motor. Alternatively, in an implementation not shown, the backrest electrically actuated device 52 may also be designed as a slider motor, and the leg electrically actuated device may be designed as a pusher motor, or both of them are designed as slider motors or pusher motor, which is not limited herein.
As shown in
The backrest electrically actuated device 52 constructed as a pusher motor includes a backrest motor head 52a and a motor pusher 52b retractable with respect to the backrest motor head 52a, in which the backrest motor head 52a is pivoted to the seat crossbar 27, and the free end of the motor pusher 52b is pivoted to the backrest crossbar 44. Therefore, when the motor pusher 52b is extended or retracted with respect to the backrest motor head 52a, the backrest crossbar 44 drives the backrest support 41 to rotate around the backrest pivot point 45.
In a preferable implementation, as shown in
In a preferable implementation, as shown in
The swing limit mechanism 6 may be switched between a swing release state and a swing limit state. In the swing release state as shown in
Hereinafter, with reference to
In the sitting position shown in the
In the relaxing position shown in the
In the lying position shown in
In an implementation of the present disclosure, the electrically actuated unit 5 is configured with a control module, in which the control module enables the position switching of the mechanical stretching device between multiple operating mode, and the operating mode is selected from a first operating mode, a second operating mode, a third operating mode, a fourth operating mode, and a fifth operating mode.
In the first operating mode, the mechanical stretching device is directly switched from the sitting position to the lying position. During this process, both the leg electrically actuated device 51 and the backrest electrically actuated device 52 work simultaneously from their respective initial state, in which the leg motor head 51a move away from the motor slider 51c, and the motor pusher 52b is retracted with respect to the backrest motor head 52a, so that the unfolding of the leg stretching device 3 and the backward reclining of the backrest support 41 are performed simultaneously. In such an arrangement, the mechanical stretching device is directly switched from the sitting position to the lying position.
In the second operating mode, the mechanical stretching device is switched from the lying position to the relaxing position. During this process, the leg motor head 51a of the leg electrically actuated device 51 is kept away from the motor slider 51c, and only the motor pusher 52b of the backrest electrically actuated device 52 are pushed with respect to the backrest motor head 52a until the backrest electrically actuated device 52 is reset to the initial state. During this process, the backrest support 41 is rotated around the backrest pivot point 45 in a clockwise direction to forwardly reset from a backward reclining position, so that the mechanical stretching device is switched from the lying position to the relaxing position.
In the third operating mode, the mechanical stretching device is directly switched from the sitting position to the relaxing position. During this process, only the leg electrically actuated device 51 works from the initial state, and the backrest electrically actuated device 52 is kept unchanged to maintain the initial state. The leg motor head 51a moves away from the motor slider 51c, so that the leg stretching device 3 is unfolded, so as to achieve that the mechanical stretching device is switched from the sitting position to the relaxing position.
The fourth operating mode is reversed from the third operating mode. In the fourth operating mode, the mechanical stretching device is switched from the relaxing position to the sitting position. Only the leg motor head 51a of the leg electrically actuated device 51 moves close to the motor slider 51c, so that the leg stretching device 3 is folded, so as to achieve that the mechanical stretching device is switched from the relaxing position to the sitting position.
In the fifth operating mode, the mechanical stretching device is directly reset from any position to the sitting position. In this process, both the leg electrically actuated device 51 and the backrest electrically actuated device 52 is switched to their respective initial state simultaneously, in which the leg motor head 51a moves closer to the motor slider 51c, and the motor pusher 52b is pushed with respect to the backrest motor head 52a, so that the folding of the leg stretching device 3 and the forward resetting of the backrest support 41 are performed simultaneously, so as to achieve that the mechanical stretching device is able to directly reset from any position (including positions between the sitting position and the relaxing position, any intermediate positions between the relaxing position and the lying position, or lying position) to the sitting position.
Consequently, different seat attitude changes may be achieved by the individual implementation of the operating modes individually or in reasonable combination. For example, when the first operating mode is combined with the second operating mode, the mechanical stretching device is capable of sequentially switching from the sitting position to the relaxing position and to the lying position. When the first operating mode is combined with the fifth operating position, the mechanical stretching device enables a one-touch transformation and a one-touch reset of the mechanical stretching device between the sitting position and the lying position.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202322065785.8 | Aug 2023 | CN | national |
