A sofa headrest height adjustment device

Abstract

The utility model relates to electric sofa technical field especially a sofa headrest height lifting adjustment device, including sofa frame, the top of sofa frame is provided with headrest frame, the between sofa frame with headrest frame is linked through support rod, still include: anti -jam detection subassembly, anti -jam detection subassembly includes top seat, the upper end of support rod is slidably installed in the inside of headrest frame, the top seat with the top of support rod screw connection, the outer wall of headrest frame is set up with base, the spring of elastic abuts between top seat with base, the periphery of support rod is equipped with limit ring, the limit ring can with the lower end surface of base abut, this sofa headrest height lifting adjustment device has solved the shortcoming that the prior art lacks anti -jam structure, and the anti -jam effect is poor.

Description

Technical Field

[0001] This utility model relates to the field of electric sofa technology, and in particular to a sofa headrest height adjustment device. Background Technology

[0002] The headrest height adjustment function is an indispensable feature of existing electric sofas, which improves the adaptability of electric sofas to different body types and postures.

[0003] Most existing electric sofas lack anti-pinch mechanisms in their headrest lifting structures, or their anti-pinch mechanisms rely on detecting changes in the torque of the drive device. This method is difficult to react quickly and lacks a buffer structure. By the time a foreign object is detected, a high squeezing force has already been applied to the object, resulting in poor anti-pinch performance. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies, such as the lack of anti-pinch structure and poor anti-pinch effect, by proposing a sofa headrest height adjustment device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Design a sofa headrest height adjustment device, including a sofa frame, a headrest frame disposed above the sofa frame, the sofa frame and the headrest frame being connected by a support rod, and further including:

[0007] An anti-pinch detection component includes a top seat. The upper end of the support rod is slidably installed inside the headrest frame. The top seat is threadedly connected to the top of the support rod. A base is provided on the outer wall of the headrest frame. A spring elastically abuts between the top seat and the base. A limiting ring is sleeved around the support rod. The limiting ring can abut against the lower end face of the base. A second micro switch is installed at the lower end of the base. The trigger key of the second micro switch can abut against the limiting ring.

[0008] Preferably, the outer end face of the support rod is longitudinally provided with a reinforcing groove, and the inner end face of the base and the limiting ring are both integrally formed with a reinforcing slider, which can slide inside the reinforcing groove to enhance the stability of sliding.

[0009] Preferably, a fixing rod is inserted through the limiting ring and the support rod, and the fixing rod is used to fix the position of the limiting ring on the support rod.

[0010] Preferably, a first micro switch is installed at the upper end of the sofa frame, and the trigger button of the first micro switch can abut against the limiting ring.

[0011] Preferably, a through hole is provided inside the top seat and the support rod, through which the wire of the second micro switch enters the interior of the sofa frame.

[0012] Preferably, the opposite end faces of the base and the top seat are both integrally formed with a limiting protrusion, which is used to prevent the spring from shifting laterally and to limit the minimum distance between the base and the top seat.

[0013] The sofa headrest height adjustment device proposed in this utility model has the following advantages:

[0014] The springs are designed to provide cushioning when foreign objects are squeezed between the sofa frame and the headrest frame, and to provide buffer time for the control panel to react, thus avoiding rigid clamping of foreign objects.

[0015] By using the second micro switch, when the second micro switch disengages from the limit ring during the descent of the headrest frame, it indicates that there is a foreign object between the sofa frame and the headrest frame, and the descent needs to be stopped. Compared with existing detection methods, the micro switch can send electrical signals more quickly and accurately, reducing the judgment time. Attached Figure Description

[0016] Figure 1 A schematic diagram of the three-dimensional structure with the main body as the core;

[0017] Figure 2 A schematic diagram of the cross-sectional structure, with the main body as the core;

[0018] Figure 3 for Figure 2 A magnified structural diagram of area A;

[0019] Figure 4 for Figure 2 A magnified structural diagram of region B.

[0020] In the diagram: 1. Sofa frame; 2. Support rod; 3. Headrest frame; 4. First micro switch; 5. Reinforced slide groove; 6. Threading hole; 7. Base; 8. Top seat; 9. Spring; 10. Limiting protrusion; 11. Limiting ring; 12. Fixing rod; 13. Second micro switch. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1

[0023] Reference Figures 1-4A sofa headrest height adjustment device includes a sofa frame 1, a headrest frame 3 mounted on top of the sofa frame 1, and the sofa frame 1 and the headrest frame 3 connected by a support rod 2. It also includes:

[0024] The anti-pinch detection component includes a top seat 8, the upper end of the support rod 2 is slidably installed inside the headrest frame 3, the top seat 8 is threadedly connected to the top of the support rod 2, the outer wall of the headrest frame 3 is provided with a base 7, a spring 9 is elastically abutting between the top seat 8 and the base 7, a limiting ring 11 is sleeved around the support rod 2, the limiting ring 11 can abut against the lower end face of the base 7, a second micro switch 13 is installed at the lower end of the base 7, and the trigger key of the second micro switch 13 can abut against the limiting ring 11.

[0025] Furthermore, refer to Figure 1 The outer end face of the support rod 2 is longitudinally provided with a reinforcing groove 5. The inner end faces of the base 7 and the limiting ring 11 are both integrally formed with reinforcing sliders. The reinforcing sliders can slide inside the reinforcing groove 5 to enhance the stability of sliding.

[0026] Furthermore, refer to Figure 3 A fixing rod 12 is inserted through the limiting ring 11 and the support rod 2. The fixing rod 12 is used to fix the position of the limiting ring 11 on the support rod 2.

[0027] Furthermore, refer to Figure 4 A first micro switch 4 is installed at the upper end of the sofa frame 1, and the trigger button of the first micro switch 4 can abut against the limit ring 11.

[0028] Furthermore, refer to Figure 2 , Figure 3 , Figure 4 The top seat 8 and the support rod 2 are connected by a through hole 6, through which the wire of the second micro switch 13 enters the interior of the sofa frame 1.

[0029] Furthermore, refer to Figure 3 Both the base 7 and the top seat 8 have an integrally formed limiting protrusion 10 on their opposite side ends. The limiting protrusion 10 is used to prevent the spring 9 from shifting laterally and to limit the minimum distance between the base 7 and the top seat 8.

[0030] Working principle:

[0031] The sofa frame 1 is equipped with a lifting drive device commonly used in the prior art. The outer surface of the support rod 2 is provided with a toothed groove that cooperates with the lifting drive device, so that the lifting drive device in the sofa frame 1 can control the support rod 2 to move up and down. When the support rod 2 moves up and down, it drives the headrest frame 3 to move up and down synchronously to realize the function of adjusting the height of the headrest frame 3.

[0032] When the headrest frame 3 moves downward toward the sofa frame 1, the support rod 2 moves the headrest frame 3 downward. When there is a large object (greater than 3cm in height) between the sofa frame 1 and the headrest frame 3, the support rod 2 drives the limiting ring 11 to continue to descend, while the headrest frame 3 cannot descend due to the obstruction. At this time, the spring 9 is compressed and contracted by the base 7 and the top seat 8 to form an elastic deformation. When the second micro switch 13 in the base 7 disengages from the limiting ring 11, it will send a signal to the logic control circuit board. This indicates that there is a foreign object between the sofa frame 1 and the headrest frame 3, and the descent needs to be stopped and the frame should be raised a certain distance. When the frame rises to the point where the second micro switch 13 re-engages with the limiting ring 11, it means that the sofa frame 1 and the headrest frame 3 are no longer clamped to the foreign object, and the operation can then stop until the user issues a descent command again.

[0033] When the limiting ring 11 contacts the first micro switch 4 and the second micro switch 13 at the same time, it indicates that the sofa frame 1 and the headrest frame 3 are in the minimum gap and there are no foreign objects blocking the sofa frame 1 and the headrest frame 3.

[0034] When the limiting ring 11 is only in contact with the first micro switch 4 and disengages from the second micro switch 13, there are two possibilities:

[0035] 1. If there is a foreign object between the sofa frame 1 and the headrest frame 3, the lifting drive device installed in the sofa frame 1 should stop operating and rise to one end. After removing the foreign object, the lowering command should be executed again.

[0036] 2. If the lifting drive device installed in the sofa frame 1 is overdriven, the support rod 2 will be pulled down excessively. At this time, the drive stroke of the lifting drive device should be adjusted immediately. In this state, the spring 9 can play a buffering role, avoiding the problem of tooth wear between the output end of the lifting drive device and the support rod 2, thus improving the service life of the components.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sofa headrest height adjustment device, comprising a sofa frame (1), a headrest frame (3) disposed above the sofa frame (1), the sofa frame (1) and the headrest frame (3) being connected by a support rod (2), characterized in that: Also includes: The anti-pinch detection component includes a top seat (8), the upper end of the support rod (2) is slidably installed inside the headrest frame (3), the top seat (8) is threadedly connected to the top of the support rod (2), the outer wall of the headrest frame (3) is provided with a base (7), a spring (9) elastically abuts between the top seat (8) and the base (7), a limiting ring (11) is sleeved around the support rod (2), the limiting ring (11) can abut against the lower end face of the base (7), a second micro switch (13) is installed at the lower end of the base (7), and the trigger key of the second micro switch (13) can abut against the limiting ring (11).

2. The sofa headrest height adjustment device according to claim 1, characterized in that: The outer end face of the support rod (2) is longitudinally provided with a reinforcing groove (5). The inner end faces of the base (7) and the limiting ring (11) are both integrally formed with reinforcing sliders. The reinforcing sliders can slide inside the reinforcing groove (5) to enhance the stability of sliding.

3. The sofa headrest height adjustment device according to claim 2, characterized in that: A fixing rod (12) is inserted through the limiting ring (11) and the support rod (2). The fixing rod (12) is used to fix the position of the limiting ring (11) on the support rod (2).

4. The sofa headrest height adjustment device according to claim 1, characterized in that: The upper end of the sofa frame (1) is equipped with a first micro switch (4), and the trigger key of the first micro switch (4) can abut against the limiting ring (11).

5. The sofa headrest height adjustment device according to claim 1, characterized in that: The top seat (8) and the support rod (2) are provided with a through hole (6), through which the wire of the second micro switch (13) enters the interior of the sofa frame (1).

6. The sofa headrest height adjustment device according to claim 1, characterized in that: The base (7) and the top seat (8) are both integrally formed with a limiting protrusion (10) on the opposite side end face. The limiting protrusion (10) is used to prevent the spring (9) from shifting laterally and to limit the minimum distance between the base (7) and the top seat (8).

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