Chassis and seat

Abstract

The utility model discloses a bottom disc and seat, bottom disc includes pedestal, bracket and spring, bottom disc has the bottom disc rear end close to chair back, and spring is set up between pedestal and bracket and is set up close to bottom disc rear end, this bottom disc breaks through tradition, and the spring that should set originally in bottom disc front end vicinity is set close to bottom disc rear end, can save four accessories in traditional bottom disc at least, namely hand wheel, screw rod, organ cover and tablet, thereby reduce production cost, obtain better market competitiveness, seat includes chair back, seat, support base and above-mentioned bottom disc, seat is connected with the bracket, and chair back is connected with seat, and support base is connected with the pedestal, when the user leans back, seat and chair back lean back and are given the upward tilt elastic force of the spring in rear, guarantee use comfort.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a chassis and a seat. Background Technology

[0002] In the field of seat manufacturing, especially in the low-end seat market, cost control has always been a key factor. Existing low-end seat chassis are often equipped with adjustable springs, which are intended to provide users with a certain degree of reclining elasticity adjustment to improve comfort. However, in actual use, not many users actually use them.

[0003] A common single-spring chassis, widely used in office chairs, includes a bracket connecting the seat, a base connected to the height adjustment gas spring and rotatably connected to the bracket, and a spring located at the front of the base. Specifically, a screw is located at the front of the base and the front of the bracket, protruding downwards below the base. A pressure plate is located at the lower end of the screw, and the spring is sleeved on the screw. The upper end of the spring abuts against the base, and the lower end of the spring abuts against the pressure plate. An accordion sleeve and a handwheel are also provided on the outside of the spring. Turning the handwheel can adjust the initial compression of the spring. In use, when the user leans back, the bracket rotates backwards on the base as the chair back rotates, and the spring's compression elastic deformation provides the reclining force of the seat.

[0004] In the low-end seat or chassis market, manufacturers often believe that springs must be adjustable to accommodate the reclining force output of people of different weights. However, in reality, in their initial state, most users, even those of different weights, can achieve a sufficiently comfortable reclining experience. Therefore, the adjustment function of the spring is rarely used, and most users are even unaware of this function. However, such adjustable springs pose a significant obstacle to cost reduction. Not only do they require high-performance materials for the springs, leading to higher material costs, but they also require the installation of components such as pressure plates, screws, bellows sleeves, and handwheels on the chassis, resulting in high component costs. This, in turn, increases production and assembly time and costs, as illustrated by Chinese patents CN201510903378.7 and CN201210298548.X.

[0005] Because the technology threshold for low-end chassis is relatively low, price advantage is the biggest competitive advantage in the market. In the current increasingly competitive market, the low-end seat market is extremely sensitive to price. The cost issues brought about by existing adjustable springs seriously limit the market competitiveness and profit margin of the products. Moreover, due to regional characteristics, producing the same chassis in regions with lower rent, steel, labor costs and lower taxes will have a greater price advantage. In order to break the current predicament, there is an urgent need for a chassis that breaks with convention and has a lower cost. Summary of the Invention

[0006] To solve the aforementioned technical problems, this utility model provides a chassis, including a base, a bracket, and a spring. The chassis has a rear end near the backrest, and the spring is vertically arranged between the base and the bracket, near the rear end of the chassis. This chassis breaks with tradition by placing the spring, which should originally be located near the front end of the chassis, closer to the rear end. This saves at least four components in traditional chassis, namely the handwheel, screw, bellows sleeve, and pressure plate, thereby reducing production costs and gaining better market competitiveness.

[0007] Furthermore, a seat is provided, including a backrest, a seat, a support base, and the aforementioned chassis. The seat is connected to the bracket, the backrest is connected to the seat, and the support base is connected to the base. When the user reclines, the seat and backrest tilt backward and are subjected to an upward tilting force provided by a spring located at the rear, ensuring comfort during use.

[0008] The technical solution of this utility model is implemented as follows:

[0009] A chassis includes a base configured to support the main body of the chassis, a bracket rotatably disposed on the base, and a spring, the bracket being configured to connect to the seat of a seat; the chassis has a rear end near the back of the seat and a front end away from the back of the seat, the spring being vertically disposed between the base and the bracket and near the rear end of the chassis.

[0010] This chassis breaks with tradition, shattering the conventional notion that springs in chassis must be adjustable. Instead, the spring, which should originally be located near the front of the chassis, is placed closer to the rear, and vertically positioned between the base and the bracket. When the bracket rotates backward, the bracket and base directly interact with the spring, compressing it and providing elasticity. This design saves at least four components found in traditional chassis: the handwheel, screw, bellows sleeve, and pressure plate, thereby reducing production costs and gaining better market competitiveness.

[0011] Moreover, it is more reasonable to place the spring near the rear end of the chassis: if the spring is placed near the front end of the chassis, when the bracket rotates backward, the spring will be stretched and used as a tension spring. Long-term stretching will cause the spring to fatigue, which will not only reduce its elasticity, but also make it easy for it to fail to fully reset, resulting in a shorter lifespan.

[0012] Another reason for placing the spring at the rear of the chassis instead of the front is that when the bracket tilts backward, the gap between the front of the bracket and the front of the base increases, and both ends of the spring need to be locked to the bracket and the base, which would result in higher processing and component costs compared to this solution. However, when the spring is placed at the rear of the chassis, tilting the bracket backward will reduce the gap between the front of the bracket and the front of the base, making it less likely for the spring to come off, so locking is not necessary.

[0013] In contrast, traditional low-end chassis also use springs for their operation, but because they are located at the front of the chassis, they require transmission components. During the rearward rotation of the bracket, the bracket does not directly act on the spring, but instead needs to drive the screw and pressure plate, which is redundant.

[0014] Preferably, the base includes a main body, and the bracket is rotatably connected to the main body; the base also includes a lower action part extending rearward from the main body, and a spring is disposed between the bracket and the lower action part.

[0015] Existing low-end chassis typically only have a main body base, or an extension on the front of the main body for mounting the spring. This mounting part is different from the lower action part in this design. The main body is generally located in the middle of the base, and has mounting holes for connecting the seat support base. The support base generally includes a lifting gas spring and chair legs; alternatively, a rod can be used to directly connect the main body and chair legs instead of a lifting gas spring. When the bracket rotates, the distance between the bracket and the base changes, so the mounting part at the front and the lower action part at the rear also differ. In this design, the lower action part is located below the spring, and the part of the bracket that abuts against the spring is the upper action part. When the bracket rotates, the distance between the upper and lower action parts decreases, acting on the spring to compress it. In practice, the lower action part remains stationary, while the upper action part rotates downwards to compress the spring.

[0016] Preferably, the lower actuating part has a first protrusion protruding upwards, the part of the bracket that abuts against the spring is the upper actuating part, and the upper actuating part has a second protrusion protruding downwards. Both the first and second protrusions are inserted into the spring. The first and second protrusions can prevent the upper and lower ends of the spring from disengaging from the abutting point.

[0017] Preferably, the distance between the upper end face of the lower actuating part and the lower end face of the bracket is 40-50mm. The distance between the upper end face of the lower actuating part and the lower end face of the bracket reflects the initial length and initial elastic force of the spring in the chassis.

[0018] Preferably, the lower actuating part is equipped with an adjusting component, which is configured to adjust the initial compression of the spring when moving relative to the lower actuating part; the upper end of the adjusting component is located below the spring or in the middle of the lower end of the spring. The chassis of this solution can also be equipped with an adjusting component with a simpler structure and lower cost to meet the needs of some users who need to adjust the size of the backward tilting spring.

[0019] Preferably, the adjusting component includes a bolt threaded to the lower actuating part and a washer located at the upper end of the bolt, with the lower end of the spring abutting against the washer. Rotation of the bolt achieves its vertical displacement. The adjusting component also includes a knob, which is fixedly connected to the bolt. This results in a simpler overall structure with fewer parts, while still reducing costs compared to existing chassis.

[0020] Preferably, the washer has a first protrusion that protrudes upward into the lower end of the spring and is configured to prevent the lower end of the spring from slipping off the washer, thus preventing the lower end of the spring from disengaging from the contact.

[0021] Preferably, the lower end face of the bracket is provided with a second protrusion, which protrudes downward to the upper end of the spring and is configured to prevent the upper end of the spring from slipping off the bracket. This prevents the upper end of the spring from disengaging from the contact point.

[0022] Preferably, in the front-to-back direction, the distance from the front end of the bracket to the front end of the base is greater than the distance from the rear end of the bracket to the rear end of the base. This reflects the relative position and dimensional relationship between the base and the bracket. In existing low-end chassis, the distance from the front end of the bracket to the front end of the base is smaller than the distance from the rear end of the bracket to the rear end of the base.

[0023] Preferably, the distance between the rotation axis of the bracket and the center of the spring is 60-75mm. Compared with existing low-end chassis, the distance between the spring and the rotation point can be set further, making the lever arm of the spring providing elastic force longer, thereby reducing the elastic force requirement of the spring. This is reflected in the material, which reduces its performance requirements and can reduce the cost of the spring.

[0024] Preferably, the thickness of the chassis is 50-70mm. Although the placement of the spring between the bracket and the base may slightly increase the overall thickness of the chassis, the thickness of the chassis actually reflects the initial length of the spring in the chassis. However, the thickness is affected by the spring material, size, and lever arm (i.e., the distance between the spring position and the rotation point of the bracket). By strengthening the initial elastic force of the spring and increasing the lever arm, the thickness of the chassis can be made thinner.

[0025] Preferably, the spring is a compression spring.

[0026] Preferably, a reinforcing rib is provided between the lower action part and the main body. This increases the strength between the lower action part and the main body. Since the bracket will compress the spring downward when it rotates backward, and the lower action part, as the support of the spring, needs sufficient structural strength, the reinforcing rib between it and the main body can effectively ensure structural strength, prevent the lower action part from being damaged by prolonged stress, and extend the service life of the chassis.

[0027] A chair includes a backrest, a seat, a support base, and a chassis. The seat is connected to the bracket, the backrest is connected to the seat, and the support base is connected to the chassis. When the user reclines, the seat and backrest tilt backward and are subjected to an upward tilting force from a spring located at the rear, ensuring comfort.

[0028] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0029] This chassis breaks with tradition, shattering the conventional notion that springs in chassis must be adjustable. Instead, the spring, which should originally be located near the front of the chassis, is placed closer to the rear, and vertically positioned between the base and the bracket. When the bracket rotates backward, the bracket and base directly interact with the spring, compressing it and providing elasticity. This design saves at least four components found in traditional chassis: the handwheel, screw, bellows sleeve, and pressure plate, thereby reducing production costs and gaining better market competitiveness.

[0030] Moreover, it is more reasonable to place the spring near the rear end of the chassis: if the spring is placed near the front end of the chassis, when the bracket rotates backward, the spring will be stretched and used as a tension spring. Long-term stretching will cause the spring to fatigue, which will not only reduce its elasticity, but also make it easy for it to fail to fully reset, resulting in a shorter lifespan.

[0031] Another reason for placing the spring at the rear of the chassis instead of the front is that when the bracket tilts backward, the gap between the front of the bracket and the front of the base increases, and both ends of the spring need to be locked to the bracket and the base, which would result in higher processing and component costs compared to this solution. However, when the spring is placed at the rear of the chassis, tilting the bracket backward will reduce the gap between the front of the bracket and the front of the base, making it less likely for the spring to come off, so locking is not necessary.

[0032] In contrast, traditional low-end chassis also use springs for their operation, but because they are located at the front of the chassis, they require transmission components. During the rearward rotation of the bracket, the bracket does not directly act on the spring, but instead needs to drive the screw and pressure plate, which is redundant. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 1 of this utility model. Figure 1 ;

[0034] Figure 2 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 1 of this utility model. Figure 2 ;

[0035] Figure 3 This is a bottom view of the chassis in Embodiment 1 of this utility model;

[0036] Figure 4 This is a cross-sectional view of the chassis in Embodiment 1 of this utility model;

[0037] Figure 5 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 2 of this utility model. Figure 1 ;

[0038] Figure 6 This is a schematic diagram of the three-dimensional structure of the chassis in Embodiment 2 of this utility model. Figure 2 ;

[0039] Figure 7 This is a cross-sectional view of the chassis in Embodiment 2 of this utility model.

[0040] The reference numerals in the attached drawings are as follows: rear end of chassis 100; front end of chassis 200; base 1; main body 11; mounting hole 111; lower actuating part 12; first protrusion 121; reinforcing rib 13; bracket 2; upper actuating part 21; second protrusion 211; spring 3; adjusting part 4; bolt 41; washer 42; knob 43. Detailed Implementation

[0041] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] The specific implementation of this utility model is as follows: Example

[0045] like Figure 1-4 As shown, this utility model provides a chassis, including a base 1 configured to support the main body of the chassis, a bracket 2 rotatably mounted on the base 1, and a spring 3. The bracket 2 is configured to connect with the seat of a seat. The chassis has a rear end 100 near the back of the seat and a front end 200 away from the back of the seat. The spring 3 is vertically mounted between the base 1 and the bracket 2 and is located near the rear end 100 of the chassis.

[0046] This chassis breaks with tradition, shattering the conventional notion that springs in chassis must be adjustable. Instead, the spring, which should originally be located near the front 200 of the chassis, is positioned closer to the rear 100 of the chassis. Furthermore, the spring 3 is vertically positioned between the base 1 and the bracket 2. When the bracket 2 rotates backward, the bracket 2 and the base 1 directly act on the spring 3, compressing the spring 3 and providing elasticity. Through this solution, at least four components in a traditional chassis can be saved: handwheel, screw, bellows sleeve, and pressure plate, thereby reducing production costs and gaining better market competitiveness.

[0047] Moreover, it is more reasonable to place the spring 3 near the rear end of the chassis at 100: if the spring is placed near the front end of the chassis at 200, the spring will be stretched and used as a tension spring when the bracket 2 rotates backward. Long-term stretching will cause the spring to fatigue, which will not only reduce its elasticity, but also make it easy to fail to fully reset, resulting in a shorter lifespan.

[0048] Another reason for placing the spring 3 at the rear end 100 of the chassis instead of the front end 200 is that when the bracket 2 tilts backward, the gap between the front part of the bracket 2 and the front part of the base 1 increases, and both ends of the spring need to be locked on the bracket 2 and the base 1, which would result in higher processing and component costs compared to this solution; while when placed at the rear end 100 of the chassis, the rearward tilt of the bracket 2 would reduce the gap between the front part of the bracket 2 and the front part of the base 1, making it less likely for the spring 3 to disengage, so locking is not required.

[0049] In contrast, traditional low-end chassis also use spring compression, but because it is located at the front 200 of the chassis, it requires transmission components. During the rearward rotation of bracket 2, bracket 2 does not directly act on the spring, but needs to drive the screw and pressure plate, which is redundant.

[0050] The chassis is used in a seat, which includes a backrest (not shown), a seat (not shown), a support base (not shown), and the aforementioned chassis. The seat is connected to the bracket 2, the backrest is connected to the seat, and the support base is connected to the base 1. When the user leans back, the seat and backrest tilt backward and are subjected to an upward tilting force from the spring 3 located at the rear, ensuring comfort.

[0051] Specifically, the base 1 includes a main body 11, and the bracket 2 is rotatably connected to the main body 11. The base 1 also includes a lower action part 12 extending rearward from the main body 11. A spring 3 is disposed between the bracket 2 and the lower action part 12. The spring 3 is a compression spring. The base of existing low-end chassis generally only has a main body, or a mounting part for installing springs is extended on the front side of the main body. This mounting part is different from the lower action part 12 of this solution. The main body 11 is generally located in the middle of the base 1. The main body 11 has a mounting hole 111 for connecting the seat support base. The support base generally includes a lifting gas spring (not shown) and a chair leg (not shown). Of course, the lifting gas spring can be omitted and the main body 11 and the chair leg can be directly connected by a rod. When the bracket 2 rotates, the distance between the bracket 2 and the base 1 changes, so the mounting part at the front and the lower action part 12 at the rear are also different. In this design, the lower action part 12 is located below the spring 3, and the part of the bracket 2 that abuts against the spring 3 is the upper action part 21. When the bracket 2 rotates, the distance between the upper action part 21 and the lower action part 12 decreases, which acts on the spring 3 to compress it. In practice, the lower action part 12 does not move, and the upper action part 21 rotates downward to compress the spring 3.

[0052] The lower action part 12 has a first protrusion 121 protruding upward, and the upper action part 21 has a second protrusion 211 protruding downward. Both the first protrusion 121 and the second protrusion 211 enter the spring 3. The first protrusion 121 and the second protrusion 211 can prevent the upper and lower ends of the spring 3 from disengaging from each other.

[0053] Furthermore, the dimensions of the chassis are as follows:

[0054] In the front-to-back direction, the distance from the front end of the bracket 2 to the front end of the base 1 is greater than the distance from the rear end of the bracket 2 to the rear end of the base 1; this reflects the relative position and size relationship between the base 1 and the bracket 2. In existing low-end chassis, the distance from the front end of the bracket 2 to the front end of the base 1 is less than the distance from the rear end of the bracket 2 to the rear end of the base 1.

[0055] The distance between the upper end face of the lower action part 12 and the lower end face of the bracket 2 is 40-50mm, and the distance in this example is 42.5mm; this distance reflects the initial length and initial elastic force of the spring 3 in the chassis.

[0056] The distance between the rotation axis of bracket 2 and the center of spring 3 is 60-75mm, and the distance in this example is 65mm. Compared with the existing low-end chassis, the distance between spring 3 and the rotation point can be set further, so that the lever arm of spring 3 provides elastic force is longer, thereby reducing the elastic force requirement of spring 3. Reflected in the material, the performance requirements are reduced, and the cost of spring can be reduced.

[0057] The thickness of the chassis is 50-70mm, and in this example, the thickness of the chassis is 55mm. Although the placement of the spring 3 between the bracket 2 and the base 1 may slightly increase the overall thickness of the chassis, the thickness of the chassis actually reflects the initial length of the spring 3 in the chassis. However, the thickness is affected by the material and size of the spring 3 and the lever arm (i.e., the distance between the position of the spring 3 and the rotation point of the bracket 2). By strengthening the initial elastic force of the spring 3 and increasing the lever arm, the thickness of the chassis can be made thinner.

[0058] In addition, a reinforcing rib 13 is provided between the lower action part 12 and the main body part 11 to increase the strength between the lower action part 12 and the main body part 11. Since the bracket 2 will compress the spring 3 downward when it rotates backward, and the lower action part 12, as the support of the spring 3, needs sufficient structural strength, the reinforcing rib 13 provided between it and the main body part 11 can effectively ensure the structural strength, prevent the lower action part 12 from being damaged by long-term stress, and extend the service life of the chassis.

[0059] Example 2: The only difference between this example and Example 1 is that this example has an adjusting component 4, which makes the initial elastic force of the spring 3 adjustable. Specifically:

[0060] like Figure 5-7As shown, the lower actuating part 12 is provided with an adjusting member 4, which is configured to adjust the initial compression of the spring 3 when moving relative to the lower actuating part 12; the upper end of the adjusting member 4 is located below the spring 3 or in the middle of the lower end of the spring 3. The chassis of this embodiment can also be provided with an adjusting member 4 that has a simpler structure and lower cost to meet the needs of some users who need to adjust the size of the backward tilting spring force.

[0061] The adjusting component 4 includes a bolt 41 threadedly connected to the lower actuating part 12 and a washer 42 disposed on the upper end of the bolt 41. The lower end of the spring 3 abuts against the washer 42. The bolt 41 rotates to achieve its vertical displacement. The adjusting component 4 also includes a knob 43, which is fixedly connected to the bolt 41. The overall structure is simpler, with fewer parts, and can still reduce costs compared to existing chassis.

[0062] The gasket 42 has a first protrusion 121, which protrudes upward to the lower end of the spring 3 and is configured to prevent the lower end of the spring 3 from slipping off the gasket 42; the second protrusion 211 is still provided on the lower end face of the bracket 2, and protrudes downward to the upper end of the spring 3 and is configured to prevent the upper end of the spring 3 from slipping off the bracket 2.

Claims

1. A chassis, characterized in that: The chassis includes a base configured to support the main body of the chassis, a bracket rotatably mounted on the base, and a spring. The bracket is configured to connect to the seat of the seat. The chassis has a rear end near the back of the seat and a front end away from the back of the seat. The spring is vertically mounted between the base and the bracket and is located near the rear end of the chassis.

2. The chassis according to claim 1, characterized in that: The base includes a main body, and a bracket is rotatably connected to the main body; the base also includes a lower action part extending rearward from the main body, and a spring is disposed between the bracket and the lower action part.

3. The chassis according to claim 2, characterized in that: The lower action part has a first protrusion protruding upwards, the part of the bracket that abuts against the spring is the upper action part, and the upper action part has a second protrusion protruding downwards. Both the first protrusion and the second protrusion are inserted into the spring.

4. The chassis according to claim 2, characterized in that: The distance between the upper end face of the lower action part and the lower end face of the bracket is 40-50mm.

5. The chassis according to claim 2, characterized in that: An adjusting member is provided on the lower actuating part, which is configured to adjust the initial compression of the spring when moving relative to the lower actuating part; the upper end of the adjusting member is located below the spring or in the middle of the lower end of the spring.

6. The chassis according to claim 5, characterized in that: The adjusting component includes a bolt threaded to the lower actuating part and a washer disposed on the upper end of the bolt, with the lower end of the spring abutting against the washer.

7. The chassis according to claim 6, characterized in that: The washer has a first protrusion that protrudes upward into the lower end of the spring and is configured to prevent the lower end of the spring from slipping off the washer.

8. The chassis according to claim 1 or 7, characterized in that: The lower end face of the bracket is provided with a second protrusion, which protrudes downward to the upper end of the spring and is configured to prevent the upper end of the spring from slipping off the bracket.

9. The chassis according to claim 1 or 2, characterized in that: In the front-to-back direction, the distance from the front end of the bracket to the front end of the base is greater than the distance from the rear end of the bracket to the rear end of the base.

10. The chassis according to claim 1, characterized in that: The distance between the rotation axis of the bracket and the center of the spring is 60-75mm.

11. The chassis according to claim 1, characterized in that: The chassis thickness is 50-70mm.

12. The chassis according to claim 1, characterized in that: The spring is a compression spring.

13. The chassis according to claim 1, characterized in that: A reinforcing rib is provided between the lower working part and the main body.

14. A type of seat, characterized in that: It includes a chair back, a chair seat, a support base, and a chassis as described in any one of claims 1-9, wherein the chair seat is connected to the bracket, the chair back is connected to the chair seat, and the support base is connected to the base.

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