Oscillating mechanical stretching device

Abstract

The application relates to a swing type mechanical stretching device which comprises a chassis assembly, a seat assembly, a leg and foot adjusting device and two mechanical stretching units, the mechanical stretching units are composed of front swing rods, rear swing rods, leg and foot assemblies, backrest mounting rods, linkages and supports, the upper ends of the front swing rods and the rear swing rods are respectively hinged to each side plate, the lower end of the front swing rod is hinged to the seat assembly, the lower end of the rear swing rod is hinged to the lower end of the support, the support is hinged to the seat assembly, the rear end of the linkage is hinged to the support, the front end of the linkage is hinged to the leg and foot assembly, a backrest adjusting device is further arranged, the backrest adjusting device comprises a backrest driving rod and a backrest driving motor, the rear end of the backrest driving motor is hinged to the seat assembly, the front end of the backrest driving motor is hinged to the backrest driving rod, the backrest driving rod is hinged to the lower end of the backrest mounting rod, and the backrest mounting rod is hinged to the seat assembly. The application has simple structure and low cost, and can respectively adjust the positions of the backrest mounting rod and the leg and foot assembly.

Description

Technical Field

[0001] This application relates to a swing-type mechanical extension device, which is mainly applicable to the design of electric seats with swing function. Background Technology

[0002] The existing swing-type chair, as seen in patent number CN202320836259.4, entitled "A Mechanical Extension Device for Barrier-Free Locking of Swinging Movement," uses a locking mechanism to lock the mechanical extension unit and the base in a reclining position, preventing regular back-and-forth swinging movements. This makes it inconvenient for consumers to enjoy the swinging function, and the structure is relatively complex with high production and maintenance costs. See also the invention application publication number CN114343368A, entitled "An Electromagnetically Driven Swinging Iron Frame," whose swing mechanism uses a single motor drive, allowing only swinging motion but not adjustment of the leg extension or the reclining position of the backrest mounting rod. Summary of the Invention

[0003] The technical problem solved by this application is to overcome the above-mentioned deficiencies in the prior art and to provide a swing-type mechanical extension device with a simple structure and low cost, which can adjust the position of the backrest mounting rod and the leg assembly separately without affecting the swing function.

[0004] The technical solution adopted by this application to solve the above-mentioned technical problems includes: a swing-type mechanical extension device, comprising a chassis assembly, a seat assembly, a leg adjustment device, and two mechanical extension units symmetrically arranged on both sides. The leg assembly is installed at the front of the seat assembly, and the leg adjustment device is installed on the seat assembly and connected to the leg assembly. A side plate is provided on each side of the chassis assembly. The mechanical extension unit is characterized by comprising a front swing rod, a rear swing rod, a leg assembly, a backrest mounting rod, a linkage, and a support member. Each side plate is hinged to the upper ends of the front swing rod and the rear swing rod, respectively. The lower end of the front swing rod is hinged to the seat assembly, and the lower end of the rear swing rod is supported by the rear swing rod. The component hinges to the lower end of the support member, which is hinged to the seat assembly. The support member is hinged to the rear end of the linkage member via the support member hinge shaft, and the front end of the linkage member is hinged to the leg assembly via the linkage member leg connecting rod hinge shaft. This allows the seat assembly, mounted on the front and rear swing rods, to swing back and forth. A backrest adjustment device is also provided, comprising a backrest drive rod and a backrest drive motor. The rear end of the backrest drive motor is hinged to the seat assembly, and the front end is hinged to the backrest drive rod. Both ends of the backrest drive rod are hinged to the lower ends of the backrest mounting rods on both sides. The backrest mounting rods are rotatably mounted on the seat assembly via the seat backrest hinge shaft. This application provides users with a swing-type mechanical extension device that allows the entire assembly to swing back and forth at any time, and the leg assembly and backrest mounting rods can be adjusted to comfortable positions independently. It is relatively simple and practical.

[0005] The seat assembly includes a seat mounting plate, a motor mounting plate, a motor fixing rod, a front seat mounting piece, and a rear seat mounting piece, which are fixed together. The lower end of the front swing arm is hinged to the lower end of the front seat mounting piece. The support piece is hinged to the lower end of the rear seat mounting piece through the hinge shaft of the rear seat mounting piece. The rear end of the backrest drive motor is hinged to the motor fixing rod.

[0006] The backrest mounting rod is provided with an upper limit rivet and a lower limit rivet. When in a sitting position, the upper limit rivet of the backrest mounting rod contacts the upper limit rivet groove of the backrest mounting rod on the seat mounting plate. When the backrest mounting rod is adjusted to the maximum recline position, the lower limit rivet of the backrest mounting rod contacts the seat mounting plate.

[0007] The backrest mounting rod is sickle-shaped with a rearward orientation and an arc-shaped lower part. The angle between the line connecting the center of the seat back hinge axis and the center of the front hinge axis of the backrest drive motor and the center line of the drive rod of the backrest drive motor is slightly greater than 90°, which helps to improve the driving efficiency of the backrest drive motor.

[0008] Compared with the prior art, this application has the following advantages and effects: simple structure and low cost, and the position of the backrest mounting rod and the leg assembly can be adjusted separately without affecting the swing function. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of the sitting posture according to an embodiment of this application.

[0010] Figure 2 This is a partial schematic diagram of the inner side of the seated posture in an embodiment of this application.

[0011] Figure 3 This is an external schematic diagram of the backrest mounting rod adjusted to tilt backward and the leg assembly retracted according to an embodiment of this application.

[0012] Figure 4 This is an external schematic diagram of the backrest mounting rod adjusted to a sitting position with the leg assembly extended, according to an embodiment of this application.

[0013] Figure 5 This is an outer schematic diagram of the backrest mounting rod adjusted to tilt and the leg assembly extended according to an embodiment of this application.

[0014] Figure 6 This is a three-dimensional schematic diagram of an embodiment of this application showing the backrest mounting rod adjusted to tilt backward and the leg assembly extended.

[0015] Figure 7 yes Figure 3 Enlarged view of a portion of the diagram.

[0016] In the picture: Chassis assembly 1, side plate 11, front hinge shaft of side plate 111, rear hinge shaft of side plate 112, front swing arm 2, rear swing arm 3, rear swing arm support hinge shaft 31, leg assembly 4, leg link 1 41, leg link 2 42, leg link 3 43, leg link 44, footrest mounting plate 45, backrest adjustment device 5, backrest drive rod 51, backrest drive motor 52, front hinge shaft of backrest drive motor 521, seat assembly 6, seat mounting plate 61, backrest upper limit rivet groove 611, motor mounting plate 62, motor fixing rod 63, motor fixing rod leg drive motor hinge shaft 631, motor fixing rod 632, hinge shaft of backrest drive motor, 64, front mounting part of seat, hinge shaft of front mounting part of seat, 641, rear mounting part of seat, 65, hinge shaft of rear mounting part of seat, 651, hinge shaft of backrest, 66, leg adjustment device, 7, leg drive rod, 71, leg drive motor, 72, backrest mounting rod, 8, upper limit rivet of backrest mounting rod, 81, lower limit rivet of backrest mounting rod, 9, linkage part leg link two hinge shaft, 92, hinge shaft of linkage part support, 10, angle α between the line connecting the center of the backrest hinge shaft and the center of the front hinge shaft of backrest drive motor and the center line of the drive rod of backrest drive motor. Detailed Implementation

[0017] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. These embodiments are illustrative of the present application, but the present application is not limited to them. Figure 2 The right side is the front, and the left side is the back.

[0018] See Figures 1 to 7The swing-type mechanical extension device of this application includes a chassis assembly 1, a seat assembly 6, a leg adjustment device 7, and two mechanical extension units symmetrically arranged on both sides. The leg assembly 4 is installed at the front of the seat assembly 6, and the leg adjustment device 7 is installed on the seat assembly 6 and connected to the leg assembly 4 to drive the extension or retraction of the leg assembly 4. A side plate 11 is provided on each side of the chassis assembly 1. The design feature of this application is that the mechanical extension unit is composed of a front swing rod 2, a rear swing rod 3, a leg assembly 4, a backrest mounting rod 8, a linkage 9, and a support 10. The upper ends of the front swing rod 2 and the rear swing rod 3 are respectively hinged to the side plate 11 through the side plate front hinge shaft 111 and the side plate rear hinge shaft 112. The lower end of the front swing rod 2 is hinged to the lower end of the seat front mounting part 64 of the seat assembly 6, and the lower end of the rear swing rod 3 is connected to the rear swing rod support hinge shaft 31. The lower end of the support member 10 is hinged, and the support member 10 is hinged to the lower end of the seat rear mounting member 65 through the seat rear mounting member hinge shaft 651. The support member 10 is hinged to the rear end of the linkage member 9 through the linkage member support member hinge shaft 92. The front end of the linkage member 9 is hinged to the leg linkage 42 through the linkage member leg linkage 2 hinge shaft 91. This allows the seat assembly 6, mounted on the front swing rod 2 and the rear swing rod 3, to swing back and forth. A backrest adjustment device 5 is also provided. The backrest adjustment device 5 includes a backrest drive rod 51 and a backrest drive motor 52. The rear end of the backrest drive motor 52 is hinged to the motor fixing rod 63 of the seat assembly 6, and the front end of the backrest drive motor 52 is hinged to the backrest drive rod 51. The two ends of the backrest drive rod 51 are respectively hinged to the lower ends of the backrest mounting rods 8 on both sides, which can drive the backrest mounting rods 8 to rotate around the seat backrest hinge shaft 66 to a position that is comfortable for the user at any time. This application omits the locking element and backrest linkage of prior art 1, simplifying the structure and reducing costs. It also provides users with a swing-type mechanical extension device that can swing back and forth as a whole at any time, and the leg assembly 4 and backrest mounting rod 8 can be adjusted to a comfortable position separately. It is relatively simple and practical.

[0019] The seat assembly 6 includes a seat mounting plate 61, a motor mounting plate 62, a motor fixing rod 63, a front seat mounting component 64, and a rear seat mounting component 65, which are fixed together as one unit.

[0020] The backrest mounting rod 8 is provided with an upper limit rivet 81 and a lower limit rivet 82. When in a seated position, the upper limit rivet 81 contacts the upper limit rivet groove 611 of the seat mounting plate 61, limiting the backrest mounting rod 8 to its maximum forward tilt position. When the backrest mounting rod 8 is adjusted to its maximum backward tilt position (see...),... Figure 3The lower limit rivet 82 of the backrest mounting rod contacts the seat mounting plate 6, limiting the maximum backward tilt position of the backrest mounting rod 8; the backrest mounting rod 8 is sickle-shaped with a backward direction, and its lower part is arc-shaped. The angle α between the line connecting the center of the seat back hinge shaft 66 and the center of the front hinge shaft 521 of the backrest drive motor and the center line of the drive rod of the backrest drive motor 52 is slightly greater than 90° (93.81° in special cases), which helps to improve the driving efficiency of the backrest drive motor 52.

[0021] The remainder of this application is prior art and will not be described in detail.

Claims

1. A swing-type mechanical extension device, comprising a chassis assembly, a seat assembly, a leg adjustment device, and two mechanical extension units symmetrically arranged on both sides, wherein the leg assembly is mounted on the front of the seat assembly, the leg adjustment device is mounted on the seat assembly and connected to the leg assembly, and a side plate is provided on each side of the chassis assembly, characterized in that: The mechanical extension unit consists of a front swing rod, a rear swing rod, a leg assembly, a backrest mounting rod, a linkage, and a support. Each side plate is hinged to the upper ends of the front and rear swing rods. The lower end of the front swing rod is hinged to the seat assembly. The lower end of the rear swing rod is hinged to the lower end of the support via a rear swing rod support hinge shaft. The support is hinged to the seat assembly. The support is hinged to the rear end of the linkage via a linkage support hinge shaft. The front end of the linkage is hinged to the leg assembly via a linkage leg connecting rod hinge shaft. A backrest adjustment device is also provided, which includes a backrest drive rod and a backrest drive motor. The rear end of the backrest drive motor is hinged to the seat assembly, and the front end of the backrest drive motor is hinged to the backrest drive rod. Both ends of the backrest drive rod are hinged to the lower ends of the backrest mounting rods on both sides. The backrest mounting rods are rotatably mounted on the seat assembly via seat backrest hinge shafts.

2. The swing-type mechanical extension device according to claim 1, characterized in that: The seat assembly includes a seat mounting plate, a motor mounting plate, a motor fixing rod, a front seat mounting piece, and a rear seat mounting piece, which are fixed together. The lower end of the front swing arm is hinged to the lower end of the front seat mounting piece. The support piece is hinged to the lower end of the rear seat mounting piece through the hinge shaft of the rear seat mounting piece. The rear end of the backrest drive motor is hinged to the motor fixing rod.

3. The swing-type mechanical extension device according to claim 1, characterized in that: The backrest mounting rod is provided with an upper limit rivet and a lower limit rivet. When in a sitting position, the upper limit rivet of the backrest mounting rod contacts the upper limit rivet groove of the backrest mounting rod on the seat mounting plate. When the backrest mounting rod is adjusted to the maximum recline position, the lower limit rivet of the backrest mounting rod contacts the seat mounting plate.

4. The swing-type mechanical extension device according to claim 1, characterized in that: The backrest mounting rod is sickle-shaped and faces backward.

5. The swing-type mechanical extension device according to claim 4, characterized in that: The angle between the line connecting the center of the seat back hinge axis and the center of the front hinge axis of the backrest drive motor and the center line of the drive rod of the backrest drive motor is slightly greater than 90 degrees.

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