Electric mechanical stretching device and electric seat

Abstract

The present application relates to an electric mechanical stretching device and an electric seat. The electric mechanical stretching device comprises two mechanical stretching units symmetrically arranged left and right; each mechanical stretching unit is composed of a seat frame supporting assembly, a leg assembly, and a backrest rod; the two mechanical stretching units are connected by means of a driving fixing assembly and a driving rod; a driving device is installed on the driving fixing assembly; the head of the driving device is hingedly connected to the driving rod and the driving rod is connected to the leg assembly; the seat frame supporting assembly is merely composed of a fixing rod and a transmission rod; the fixing rod is fixedly connected to the driving fixing assembly; the front part of the fixing rod is hingedly connected to the leg assembly by means of a leg connecting rod II and fixing rod hinging shaft, and the rear part of the fixing rod is hingedly connected to the backrest rod by means of a fixing rod and backrest rod hinging shaft; a backrest lying posture limiting member is provided on the backrest rod; and the lower part of the backrest rod is hingedly connected to the rear end of the transmission rod by means of a transmission rod and backrest rod hinging shaft. The present application is simple in structure and convenient in production, installation, and maintenance, merely requires one driving device to carry out posture adjustment of the leg assembly and the backrest rod, and has low costs.

Description

Electric mechanical extension device and electric seat Technical Field

[0001] The present application relates to an electric mechanical extension device and an electric seat, which are mainly suitable for the design of an electric seat with adjustable posture. Background Art

[0002] The electric seats in the prior art usually require two motors, which are used to adjust the posture of the leg assembly and the backrest rod respectively. The electric seat structure is relatively complex, with many parts, relatively complex production and installation steps, and high material consumption, which increases production and maintenance costs. Summary of the Invention

[0003] The technical problem solved by the present application is to overcome the above-mentioned deficiencies in the prior art and to provide an electric mechanical extension device and an electric seat with a simple structure, easy production, installation and maintenance, and low cost.

[0004] The technical solution adopted by the present application to solve the above-mentioned technical problems includes: an electric mechanical extension device, including two mechanical extension units symmetrically arranged on the left and right, each mechanical extension unit consisting of a seat frame support assembly, a leg assembly, and a backrest rod, the two mechanical extension units are connected through a driving fixed assembly and a driving rod, the driving device is installed on the driving fixed assembly, the head of the driving device is hinged to the driving rod, and the driving rod is connected to the leg assembly, which is characterized in that: the seat frame support assembly is only composed of a fixing rod and a transmission rod, the fixing rod is fixedly connected to the driving fixed assembly, the front part of the fixing rod is hinged to the leg assembly through the leg connecting rod and the second fixing rod hinge axis, the rear part of the fixing rod is hinged to the backrest rod through the fixing rod backrest rod hinge axis, a backrest lying position limiter is provided on the backrest rod, and the lower part of the backrest rod is hinged to the rear end of the transmission rod through the transmission rod backrest rod hinge axis. The present application forms a quadrilateral support structure of the seat through a fixed rod, a transmission rod, two upper halves of the leg connecting rod, and a lower half of the backrest rod, which saves the process flow, reduces the number of parts, simplifies the installation, maintenance and debugging steps, and only requires one drive device to adjust the posture of the leg assembly and the backrest rod, which saves relatively much cost.

[0005] The leg assembly is composed only of leg link one, leg link two, leg link three, leg link four, and a footrest. The driving rod is fixedly connected to the leg link one, one end of the leg link one is hinged to the fixed rod, the other end of the leg link one is hinged to one end of the leg link three, the other end of the leg link three is hinged to one end of the footrest, the other end of the footrest is hinged to one end of the leg link four, the middle of the leg link four is hinged to the leg link one, the other end of the leg link four is hinged to one end of the leg link two, and the other end of the leg link two is hinged to the fixed rod through the hinge axis of the fixed rod of the leg link two.

[0006] The footrest is provided with a leg assembly limiter, which is a three-touch limiter between the leg assembly and the leg connecting rod when the patient is in a lying position; and a four-touch limiter between the leg assembly and the leg connecting rod when the patient is in a sitting position.

[0007] There is only one driving device, and the postures of the leg assembly and the backrest rod are adjusted by the one driving device.

[0008] The technical solution adopted by this application to solve the above-mentioned technical problems also includes: an electric seat, characterized in that: the electric seat includes the above-mentioned electric mechanical extension device, a drive device and a chassis, the electric mechanical extension device is installed on the chassis through a rotating shaft, and the user can conveniently adjust the seat direction by freely rotating it.

[0009] The rotating shaft is rotatably mounted in the middle of the driving and fixing assembly.

[0010] Compared with the prior art, the present application has the following advantages and effects: simple structure, easy production, installation and maintenance, only one drive device is required to adjust the posture of the leg assembly and the backrest rod, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is a three-dimensional schematic diagram of a sitting posture of an electric chair according to an embodiment of the present application.

[0012] FIG2 is a side view of the electric chair in the embodiment of the present application in a sitting position.

[0013] FIG3 is a perspective schematic diagram of the lying position of the electric seat according to an embodiment of the present application.

[0014] FIG4 is a side view of the electric seat in a lying position according to an embodiment of the present application.

[0015] In the picture:

[0016] Drive fixing assembly 1, drive rod 2, leg assembly 3, leg link one 31, leg link two 32, leg link two fixed rod hinge shaft 3241, leg link two transmission rod hinge shaft 3242, leg link three 33, leg link four 34, footrest 35, leg assembly limit 351, seat frame support assembly 4, fixed rod 41, fixed rod backrest rod hinge shaft 415, transmission rod 42, transmission rod backrest rod hinge shaft 425, backrest rod 5, backrest lying position limit 51, rotating shaft 6, chassis 7, drive device 8. Implementation Method

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are provided to explain the present invention and the present invention is not limited to the following examples. The right side of FIG2 of the present invention is the front side and the left side is the back side.

[0018] 1 to 4 , the electric mechanical extension device of the embodiment of the present application includes two mechanical extension units symmetrically arranged on the left and right, each mechanical extension unit consisting of a seat frame support assembly 4, a leg assembly 3, and a backrest rod 5, the two mechanical extension units are connected by a driving fixed assembly 1 and a driving rod 2, a driving device 8 is installed on the driving fixed assembly 1, the driving device head is hinged to the driving rod 2, and the driving rod 2 is connected to the leg assembly 3. The design feature of the present application is that the seat frame support assembly 4 is only composed of a fixing rod 41 and a transmission rod 42, the fixing rod 41 is fixedly connected to the driving fixed assembly 1, the front part of the fixing rod 41 is hinged to the leg link 2 32 through the leg link 2 fixing rod hinge shaft 3241, and the rear part of the fixing rod 41 is hinged to the backrest rod 5 through the fixing rod backrest rod hinge shaft 415, a backrest lying position limiter 51 is provided on the backrest rod 5, and the lower part of the backrest rod 5 is hinged to the rear end of the transmission rod 42 through the transmission rod backrest rod hinge shaft 425; the posture adjustment of the leg assembly 3 and the backrest rod 5 is performed by a driving device 8. The present application forms a quadrilateral support structure of the seat through a fixed rod 41, a transmission rod 42, the upper half of the leg link 2 32, and the lower half of the backrest rod 5, which saves the process flow, reduces the number of parts, simplifies the installation, maintenance and debugging steps, and only requires one drive device 8 to adjust the posture of the leg assembly 3 and the backrest rod 5, which saves costs relatively.

[0019] The leg assembly 3 described in the present application is composed only of leg link 1 31, leg link 2 32, leg link 33, leg link 4 34, and a footrest 35. The driving rod 2 is fixedly connected to the leg link 1 31, one end of the leg link 1 31 is hinged to the fixed rod 41, the other end of the leg link 1 31 is hinged to one end of the leg link 3 33, the other end of the leg link 3 33 is hinged to one end of the footrest 35, the other end of the footrest 35 is hinged to one end of the leg link 4 34, the middle of the leg link 4 34 is hinged to the leg link 1 31, the other end of the leg link 4 34 is hinged to one end of the leg link 2 32, and the other end of the leg link 2 32 is hinged to the fixed rod 41 through the leg link 2 fixed rod hinge shaft 3241.

[0020] The posture adjustment process of the embodiment of the present application is as follows:

[0021] When the embodiment of the present application switches from a sitting position to a lying position, the head of the driving device 8 moves forward, driving the leg link 1 31 forward via the driving rod 2, driving the connected leg links 3 33 and 4 34 to move accordingly. These in turn drive the connected footrest 35 and leg link 2 32 to move accordingly. The forward movement of leg link 2 32 drives the lower end of the backrest rod 5 forward, causing the upper end of the backrest rod 5 to rotate backward and downward about the fixed rod backrest rod hinge axis 415. When the backrest rod 5 contacts the backrest lying position limiter 51, the position is shifted to the lying position (see Figures 3 and 4). Simultaneously, the leg assembly limiter 351 contacts the leg link 3 33, locking the leg assembly 3 in place. When the position is shifted from the lying position to the sitting position, the head of the driving device 8 retracts backward, driving the leg assembly 3 to retract accordingly, causing the upper end of the backrest rod 5 to rotate upward and forward. When the leg assembly limiter 351 contacts the leg link 4 34, the position is shifted to the sitting position (see Figures 1 and 2).

[0022] The electric mechanical stretching device is installed on the chassis 7 through the rotating shaft 6, and then the driving device 8 is installed to form a rotatable electric seat. The driving device 8 adopts an electric push rod that drives forward and backward.

[0023] The parts not described in this application are all prior art and will not be described in detail.

Claims

1. An electric mechanical extension device, comprising two mechanical extension units arranged symmetrically on the left and right, each mechanical extension unit consisting of a seat frame support assembly, a leg assembly, and a backrest rod, the two mechanical extension units are connected through a drive fixing assembly and a drive rod, the drive device is mounted on the drive fixing assembly, the drive device head is hinged to the drive rod, and the drive rod is connected to the leg assembly, wherein: The seat frame supporting assembly is composed of only a fixed rod and a transmission rod. The fixed rod is fixedly connected to the driving fixed assembly. The front part of the fixed rod is hinged to the leg assembly through the two fixed rod hinge shafts of the leg connecting rod. The rear part of the fixed rod is hinged to the backrest rod through the fixed rod backrest rod hinge shaft. A backrest lying position limiter is provided on the backrest rod. The lower part of the backrest rod is hinged to the rear end of the transmission rod through the transmission rod backrest rod hinge shaft.

2. The electromechanical stretching device according to claim 1, characterized in that: The leg assembly is composed of only leg link one, leg link two, leg link three, leg link four, and a footrest. The driving rod is fixedly connected to the leg link one, one end of the leg link one is hinged to the fixed rod, the other end of the leg link one is hinged to one end of the leg link three, the other end of the leg link three is hinged to one end of the footrest, the other end of the footrest is hinged to one end of the leg link four, the middle of the leg link four is hinged to the leg link one, the other end of the leg link four is hinged to one end of the leg link two, and the other end of the leg link two is hinged to the fixed rod through the hinge axis of the fixed rod of the leg link two.

3. The electromechanical stretching device according to claim 2, characterized in that: The footrest is provided with a leg assembly limiter, and the leg assembly limiter and the leg connecting rod have three touch limits when the leg is in a lying position; and the leg assembly limiter and the leg connecting rod have four touch limits when the leg is in a sitting position.

4. The electromechanical stretching device according to claim 1, characterized in that: There is only one driving device, and the posture adjustment of the leg assembly and the backrest rod is performed through the one driving device.

5. An electric seat, characterized in that: The electric seat comprises the electric mechanical extension device as claimed in claim 4, a driving device and a chassis, and the electric mechanical extension device is mounted on the chassis via a rotating shaft.

6. The electric seat according to claim 5, characterized in that: The rotating shaft is rotatably mounted in the middle of the driving and fixing assembly.

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