Bottom supporting piece of chair

Abstract

The utility model provides a bottom supporting piece of a chair, which comprises a base, rollers capable of enabling the bottom supporting piece to move on the ground and a pedal piece with a foot rest function, and the rollers and the pedal piece are arranged on the base. The pedal piece is arranged on the base in an up-down movable mode by arranging an elastic piece between the mounting part of the pedal piece and the base, and the elastic piece gives upward elastic force to the pedal piece all the time; the bottom supporting piece further has an initial state and a locking state, in the initial state, the elastic piece acts on the pedal piece to enable the pedal piece to be suspended above the ground, and the rolling wheels can roll on the ground to enable the bottom supporting piece to move; in the locking state, the foot rest part bears downward force due to the fact that the foot of the human body is placed on the foot rest part, and the elastic part deforms to enable the pedal part to move downwards to make contact with the bottom face so as to lock movement of the bottom supporting part; the pedal piece not only has a footrest function, but also has a brake anti-slip function, a brake wheel does not need to be selected as the idler wheel, and only a common universal wheel is needed.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a bottom support piece of a chair. Background Art

[0002] With the continuous improvement of living standards, people are paying more and more attention to the impact of furniture on children. High-quality children's furniture that meets parents' psychological expectations often gains more market share. Therefore, based on user feedback, product updates and iterations are very necessary. In order to make it more suitable for children, manufacturers have developed a children's chair with rollers to facilitate the movement of the children's chair. However, parents hope that the rollers on the children's chair can be locked when the child is sitting in the children's chair or when sitting on and getting up to improve safety. Therefore, manufacturers choose brake wheels as rollers. Specifically, there are at least two brake wheels on the children's chair, which are generally set on the two front legs of the children's chair. When locking, both brake wheel switches need to be stepped on. When unlocking, both brake wheel switches need to be lifted up, which is inconvenient to operate. What's more troublesome is that you even need to squat down and use your hands to pry the switch to unlock.

[0003] Moreover, the cost of brake wheels is high. Compared with ordinary universal wheels, the cost of a single brake wheel is 4-8 times that of ordinary universal wheels. The high cost greatly reduces the manufacturer's profit. Moreover, when the brake wheels are replaced during after-sales service, the cost is further increased.

[0004] In addition, since the legs of the children's chair are horizontal and the brake wheel is set under the legs, the protruding switch of the brake wheel interferes with the legs when the brake wheel turns. Once the interference occurs, the other rollers are oriented differently from the brake wheel, and the children's chair cannot be moved. Therefore, a positioning pin is required on the brake wheel to limit the rotation range of the brake wheel. In short, the brake wheel is different from the ordinary universal wheel. It cannot achieve 360° rotation. Therefore, the brake wheel can only move the children's chair in a straight line, and it is difficult to make the children's chair rotate. The movement of the children's chair becomes very rigid.

[0005] It can be seen from this that using brake wheels on children's chairs is not a preferred solution. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, the utility model provides a bottom support member of a chair, comprising a base, a roller capable of moving the bottom support member on the ground, and a footrest member with a footrest function, the roller and the footrest member are both arranged on the base, and the footrest member is arranged on the base so that the footrest member can move up and down by arranging an elastic member between its mounting portion and the base, and the elastic member always gives the footrest member an upward elastic force; the bottom support member also has an initial state and a locked state, in the initial state, the elastic member acts on the footrest member, so that the footrest member is lifted off the ground, and the roller can roll on the ground to move the bottom support member; in the locked state, the footrest portion is subjected to a downward force due to the resting of the human body's foot, and the elastic member is deformed to cause the footrest member to move downward until it contacts the ground, so as to lock the movement of the bottom support member.

[0007] The technical solution of the present utility model is achieved as follows:

[0008] A bottom support member for a chair, comprising:

[0009] base;

[0010] Rollers are disposed on the base, the rollers being configured to enable the bottom support member to move on the ground;

[0011] The footrest is configured to have a footrest function; the footrest is movably arranged on the base, the footrest includes a footrest portion for resting the foot and a mounting portion for connecting to the base, the footrest portion and the mounting portion are connected together, and an elastic member is provided between the mounting portion and the base, the elastic member is configured to act on the footrest and always give the footrest an upward elastic force;

[0012] The bottom support member also has an initial state and a locked state. In the initial state, the elastic member acts on the pedal member, so that the pedal member is lifted off the ground, and the roller can roll on the ground to move the bottom support member; in the locked state, the footrest is subjected to a downward force, and the elastic member is deformed to cause the pedal member to move downward until it contacts the ground, thereby locking the movement of the bottom support member.

[0013] When switching from the initial state to the locked state, the user's foot rests on the footrest, which is subjected to a downward force, causing the elastic member to deform. When switching from the locked state to the initial state, the footrest is released, and the elastic member drives the pedal member to reset, and the pedal member becomes airborne again. The pedal member not only has a footrest function, but also has a brake and anti-skid function. In this way, the brake and anti-skid function of the brake wheel is replaced by the pedal member, and the roller no longer needs a brake wheel, and only an ordinary universal wheel can be used. The advantages brought are: first, the cost is greatly reduced, which improves the manufacturer's efficiency; second, the operation of brake locking and unlocking is more convenient, without having to stand up or bend over to operate, just stepping on the pedal member can achieve braking, and leaving the pedal member can unlock; third, the interference problem between the brake wheel and the base is solved, making the roller flexible in steering and the child chair more flexible when moving.

[0014] Preferably, the mounting portion is located below the base, and a screw is provided below the base. The screw passes through the mounting portion from bottom to top and is connected to the base. A gap is defined between the lower end surface of the mounting portion and the head of the screw. An elastic member is provided between the head of the screw and the mounting portion, with both ends of the elastic member abutting the head of the screw and the mounting portion, respectively. The gap between the lower end surface of the mounting portion and the head of the screw provides space for the mounting portion to move up and down. The elastic member has a compressed pre-deformation that constantly applies an upward elastic force to the mounting portion. When the footrest is not under force, the footrest can remain airborne and not contact the ground, the roller can roll, and the bottom support member can move. The screw is a stepped screw.

[0015] Preferably, the mounting portion includes a downwardly open receiving groove; an escape hole is defined on an end surface of the receiving groove, through which a screw passes to connect to the base; and the elastic member is sleeved over the screw and positioned within the receiving groove. The escape hole has a smaller diameter than the receiving groove, allowing the screw to pass through the escape hole while the elastic member abuts against the end surface of the receiving groove surrounding the escape hole.

[0016] Preferably, the elastic member is a spring. The cost of the spring is low, and the cost of an ordinary universal wheel and a spring is still much lower than that of a brake wheel.

[0017] Preferably, an auxiliary elastic member is provided between the mounting portion and the base. The auxiliary elastic member is a spring, one end of which is mounted on the screw and the other end of which abuts against the mounting portion, thereby providing further elastic force and playing a protective role, thereby preventing the elastic member from being insufficiently elastic and thus failing to keep the pedal in the air.

[0018] Preferably, a baffle is provided on the screw, positioned in the gap, with the lower end of the elastic member abutting against the baffle; the spring is disposed between the baffle and the screw head. The provision of the baffle stabilizes the abutment of the elastic member and prevents slippage during abutment; the baffle constrains one end of the spring, allowing it to deform smoothly and generate elastic force.

[0019] Preferably, the spring piece is in a downwardly curved arch shape, which helps the spring piece to impart elastic force to the brake pad.

[0020] Preferably, the elastic member is a spring sheet, one end of which is fixed on the screw, and the other end of which abuts against the mounting portion.

[0021] Preferably, the elastic member is a spring, the mounting portion is located below the base, the elastic member is disposed above the mounting portion, and the ends of the elastic member are connected to the base and the mounting portion, respectively. The spring has a pre-tensioned tension to constantly provide an upward elastic force to the footrest, allowing the footrest to remain airborne when no force is applied.

[0022] Preferably, the elastic member is a spring sheet, one end of which is fixed to the base, and the other end of which abuts or is inserted into the mounting portion. The spring sheet has a downwardly curved pre-deformation, and by having one end fixed to the base and the other end acting on the mounting portion, it constantly provides an upward elastic force to the footrest, thereby causing the footrest to be lifted into the air without being subjected to force.

[0023] Preferably, the roller is a universal roller. In addition to rolling, the roller can also rotate on the base to switch the rolling direction, that is, the roller can turn, and the roller can rotate on the base within a range of 360 degrees, that is, full-angle turning. The rolling direction of the roller is not restricted, so that the chair can be moved in any direction when on the ground, which is more flexible.

[0024] As preferably, the pedal member lower end is provided with a friction pad. When the pedal member moves down to brake, the friction pad contacts the ground, which increases friction on the one hand and prevents the pedal member from wearing away the floor and the pedal member itself from wearing away on the other hand.

[0025] Preferably, the base includes a main body and at least two supporting legs extending outward from the main body, and the rollers are mounted below the supporting legs. The supporting legs can increase the floor space of the base and increase the stability of the base.

[0026] Preferably, there are two supporting legs, and the two supporting legs are symmetrically arranged at the front end of the main body; the two supporting legs extend forward on the main body and extend toward the outside of the main body in the left and right directions. Similarly, this solution increases the stability of the base.

[0027] Preferably, there are two mounting portions, one at the left and right ends of the footrest, and one below each of the two supporting legs. At least two elastic members are spaced apart between each mounting portion and the supporting legs. A larger number of mounting portions and elastic members can increase the stability of the footrest when it is airborne.

[0028] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0029] When switching from the initial state to the locked state, the user's foot rests on the footrest, which is subjected to a downward force, causing the elastic member to deform. When switching from the locked state to the initial state, the footrest is released, and the elastic member drives the pedal member to reset, and the pedal member becomes airborne again. The pedal member not only has a footrest function, but also has a brake and anti-skid function. In this way, the brake and anti-skid function of the brake wheel is replaced by the pedal member, and the roller no longer needs a brake wheel, and only an ordinary universal wheel can be used. The advantages brought are: first, the cost is greatly reduced, which improves the manufacturer's efficiency; second, the operation of brake locking and unlocking is more convenient, without having to stand up or bend over to operate, just stepping on the pedal member can achieve braking, and leaving the pedal member can unlock; third, the interference problem between the brake wheel and the base is solved, making the roller flexible in steering and the child chair more flexible when moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the children's chair in Example 1 of the present invention;

[0031] Figure 2 This is a front view of the children's chair in the initial state of Example 1 of the present invention;

[0032] Figure 3 This is a front view of the child chair in the locked state in Example 1 of the present invention;

[0033] Figure 4 This is a side view of the children's chair in the initial state of Example 1 of the present invention;

[0034] Figure 5 This is a side view of the children's chair in the locked state in Example 1 of the present invention;

[0035] Figure 6 This is a three-dimensional schematic diagram of the bottom support member in Example 1 of the present invention;

[0036] Figure 7 This is a bottom view of the bottom support member in Example 1 of the present invention;

[0037] Figure 8 This is a cross-sectional view of the bottom support member in Example 1 of the present invention;

[0038] Figure 9 This is a schematic diagram of the three-dimensional structure of the spring in Example 1 of the present invention;

[0039] Figure 10 This is a bottom view of the spring piece as an elastic member arranged on the mounting portion in Example 2 of the present invention;

[0040] Figure 11 This is a bottom view of the spring piece connected to the base and abutting against the mounting portion in Example 3 of the present invention;

[0041] Figure 12 This is a schematic diagram of the three-dimensional structure of the bottom support member in Example 4 of the present invention;

[0042] Figure 13 This is a cross-sectional view of the bottom support member in Example 4 of the present invention;

[0043] Figure 14 This is a schematic diagram of the three-dimensional structure below the guide portion in Example 4 of the present utility model;

[0044] Figure 15 This is a schematic diagram of the three-dimensional structure inside the guide part in Example 4 of the present utility model;

[0045] Figure 16 This is a schematic diagram of the three-dimensional structure of the floating plate, the mounting plate and the spring installation in Example 4 of the present invention;

[0046] Figure 17 This is a bottom view of the rotatable connection between the rotating seat and the mounting portion in Example 5 of the present invention;

[0047] Figure 18 This is a schematic diagram of a spring disposed behind the rotating shaft in Example 5 of the present invention;

[0048] Figure 19 This is a schematic diagram of a spring disposed in front of the rotating shaft in Example 5 of the present invention;

[0049] Figure 20 This is a schematic diagram of a torsion spring disposed on a rotating shaft in Example 6 of the present invention;

[0050] Figure 21 This is a bottom view of the base and the mounting portion in Example 7 of the present invention, which are rotatably connected via a rotating shaft.

[0051] The figures are marked as follows: base 1; main body 101; support leg 102; roller 2; foot pedal 3; footrest 31; support arm 310; base 311; mounting portion 32; support rod 4; seat 5; backrest 6; pull ring 7; friction pad 8; mounting column 9; screw 91; avoidance hole 10; accommodating groove 11; spring piece 12; abutment portion 121; baffle 13; footrest 14; sleeve 16; guide portion 18; mounting groove 19; guide column 20; floating plate 21; mounting plate 22; first screw 23; second screw 24; spring 25; rotating seat 26; rotating shaft 27; torsion spring 28. DETAILED DESCRIPTION

[0052] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0053] In the following description, many specific details are set forth to facilitate 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.

[0054] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0055] The specific implementation of the utility model is as follows: Example

[0056] like Figure 1-6 As shown, the utility model provides a bottom support member of a chair, comprising:

[0057] Base 1;

[0058] Rollers 2 are provided on the base 1 and are configured to enable the bottom support member to move on the ground;

[0059] The footrest 3 is configured to have a footrest function; the footrest 3 is movably arranged on the base 1, and includes a footrest portion 31 for resting the foot and a mounting portion 32 for connecting to the base 1. The footrest portion 31 and the mounting portion 32 are connected together. An elastic member is provided between the mounting portion 32 and the base 1, and the elastic member is configured to act on the footrest 3 and always give the footrest 3 an upward elastic force;

[0060] The bottom support member also has an initial state and a locked state. In the initial state, the elastic member acts on the footrest member 3, so that the footrest member 3 is lifted off the ground, and the roller 2 can roll on the ground to move the bottom support member; in the locked state, the footrest portion 31 is subjected to a downward force due to the human foot resting on it, and the elastic member deforms to cause the footrest member 3 to move downward until it contacts the ground, thereby locking the movement of the bottom support member.

[0061] When switching from the initial state to the locked state, the user's foot rests on the footrest 31, which is subjected to a downward force, causing the elastic member to deform. When switching from the locked state to the initial state, the footrest 31 is released, and the elastic member drives the pedal member 3 to reset, and the pedal member 3 is once again in the air. The pedal member 3 not only has a footrest function, but also has a brake and anti-skid function. In this way, the pedal member 3 replaces the brake and anti-skid function of the brake wheel. The roller 2 no longer needs a brake wheel, and only an ordinary universal wheel can be used. The advantages brought are: first, the cost is greatly reduced, which improves the efficiency of the manufacturer. Specifically, on the market, the cost of a brake wheel is 4-5 yuan, and the better ones cost 6-8 yuan, while an ordinary universal wheel only costs more than 1 yuan. Even if the cost of the elastic member and the pedal member 3 is added, it will not exceed 3 yuan. In the case of mass production, the production cost is greatly reduced.

[0062] Secondly, the operation of locking and unlocking the brake is more convenient. There is no need to stand up or bend over to operate it. The brake can be braked by stepping on the foot pedal 3, and the brake can be unlocked by taking the foot off the foot pedal 3. In addition, the interference problem between the brake wheel and the base 1 is solved, so that the steering of the roller 2 is flexible and the children's chair is more flexible when moving.

[0063] Specifically, if Figure 1-5 As shown, the bottom support member is used in a children's chair, which also includes a support rod 4 inserted into the base 1 and a seat 5 and a backrest 6 arranged on the support rod 4. The support rod 4 is used to support the seat 5 and the backrest 6, and the base 1 serves as the main support of the children's chair. The seat 5 is used to support the human buttocks, and the backrest 6 is used to support the human back; a pull ring 7 is also provided at the upper end of the support rod 4, and holding the pull ring 7 facilitates pushing and pulling the children's chair. When pushing and pulling the children's chair, the footrest 3 is vacant, the roller 2 can rotate smoothly, and the children's chair can move in any direction, which is very flexible; when the user sits on the seat 5 and puts his feet on the footrest 3, the footrest 3 is naturally stepped on and contacts the ground, thereby achieving braking. The anti-slip function prevents the roller 2 from rolling, and the movement of the children's chair is locked, thereby improving the safety when sitting. Furthermore, the roller 2 is a universal roller 2. In addition to rolling, the roller 2 can also rotate on the base 1 to switch the rolling direction, that is, the roller 2 can turn, and the rotatable range of the roller 2 on the base 1 is 360°, that is, full-angle turning. The rolling direction of the roller 2 is not restricted, so that the chair can move in any direction when on the ground, which is more flexible. A friction pad 8 is provided at the lower end of the footrest 3. When the footrest 3 moves down to brake, the friction pad 8 contacts the ground, which increases friction on the one hand and prevents the footrest 3 from wearing the floor and the footrest 3 itself on the other hand. The friction pad 8 can be made of rubber.

[0064] Furthermore, the base 1 includes a main body 101 and at least two supporting legs 102 extending outward from the main body 101, and the roller 2 is installed below the supporting legs 102; in this embodiment, Figure 7 As shown, there are two support legs 102 and the two support legs 102 are symmetrically arranged at the front end of the main body 101; the two support legs 102 extend forward on the main body 101, and at the same time extend toward the outside of the main body 101 in the left and right directions; the support legs 102 can increase the floor area of the base 1, increase the stability of the base 1, and thus increase the stability of the user when sitting.

[0065] In this embodiment, the elastic member is a spring 25, the footrest 3 is U-shaped and the footrest 31 is U-shaped, the footrest 31 includes two arms 310 that are divergent and extend toward the middle of the support foot 102, and there are two mounting portions 32, the two mounting portions 32 are respectively located at the left and right ends of the footrest 31, that is, at the ends of the arms 310, and the two mounting portions 32 are respectively located under the two support foot portions 102, and at least two springs 25 arranged at intervals are provided between each mounting portion 32 and the support foot portion 102; the number of mounting portions 32 and springs 25 is large, which can increase the stability of the footrest 3 when it is in the air; when the user steps on the footrest 31, the mounting portion 32 floats due to the spring 25, and the front end of the footrest 3 will tilt downward and contact the ground.

[0066] The shape of the base 1 and the footrest 3 is not a key factor to be considered in this solution. Even if the base 1 and the footrest 3 have other shapes, the braking and anti-slip function of the children's chair can still be achieved through this solution; and in addition to being able to tilt the front end, the footrest 3 can also move up and down to contact the ground.

[0067] More specifically, if Figure 7 、 8As shown, the mounting portion 32 is not directly connected to the support leg portion 102. Each support leg portion 102 is provided with two downwardly facing mounting posts 9, which can be used to install screws 91. An avoidance hole 10 is provided on the mounting portion 32 below the mounting post 9. The screw 91 passes through the avoidance hole 10 of the mounting portion 32 from bottom to top and is installed on the mounting post 9 of the support leg portion 102. The screw 91 is a stepped screw 91, so that there is a gap between the lower end surface of the mounting portion 32 and the head of the screw 91; further, a receiving groove 11 is provided on the mounting portion 32, and the receiving groove 11 is open downwardly. The avoidance hole 10 is located on the end surface of the receiving groove 11, and the spring 25 is arranged between the head of the screw 91 and the mounting portion 32, that is, the spring 25 is sleeved on the screw 91 and located in the receiving groove 1 1, the two ends of the spring 25 abut against the head of the screw 91 and the end face of the accommodating groove 11 respectively; the above scheme realizes low-cost braking, and the gap between the lower end face of the mounting portion 32 and the head of the screw 91 allows the mounting portion 32 to have space for moving up and down, and the spring 25 has a compressed pre-deformation and always gives the mounting portion 32 an upward elastic force. When the footrest 31 is not under force, the footrest 3 can remain in the air without touching the ground, the roller 2 can roll, and the bottom support member can move; the diameter of the avoidance hole 10 is smaller than the accommodating groove 11, the screw 91 can pass through the avoidance hole 10 and the elastic member can abut against the end face of the accommodating groove 11 around the avoidance hole 10; the cost of the spring 25 is low, and the sum of the cost of an ordinary universal wheel and the spring 25 is still much lower than that of a brake wheel.

[0068] Further, if Figure 6-9 As shown, an auxiliary elastic member is further provided between the mounting portion 32 and the base 1. The auxiliary elastic member is a spring 12. One end of the spring 12 is provided on the screw 91, and the other end of the spring 12 abuts against the mounting portion 32, thereby further providing elastic force and playing a protective role to prevent the elastic member from being insufficiently elastic, resulting in the inability to keep the pedal member 3 in the air; specifically, a baffle 13 is provided on the screw 91, and the diameter of the baffle 13 is larger than the head of the screw 91. The baffle 13 is located in the gap, and the lower end of the spring 25 abuts against the baffle 13; the spring 12 is provided between the baffle 13 and the head of the screw 91; for the spring 25, setting The blocking piece 13 can make the spring 25 abut against the ground more stable and prevent the spring 25 from slipping when abutting; for the spring piece 12, the blocking piece 13 limits one end of the spring piece 12, so that the spring piece 12 can be deformed smoothly and generate elastic force; the shape of the spring piece 12 is a downward-bent arch, which is conducive to the spring piece 12 giving elastic force to the brake pad; the spring piece 12 is bent at its end away from the screw 91 to form an abutting portion 121, and the abutting portion 121 abuts against the mounting portion 32, and the spring piece 12 has a downward pre-deformation, so that when the foot pedal 3 is not subjected to force, the spring piece 12 still gives the foot pedal 3 an upward elastic force.

[0069] The footrest portion 31 also includes a base 311 and a footrest 14. The support arm 310 is a part of the base 311. The base 311 is connected to the mounting portion 32. The footrest 14 is connected to the base 311 by at least one lifting column (not shown) inserted on the base 311; in this embodiment, two lifting columns are provided at the lower end of the footrest 14, and two sleeves 16 are correspondingly provided on the base 311. The two lifting columns are respectively inserted in the two sleeves 16; a plurality of vertically arranged gear holes (not shown) are opened on the lifting columns, and a sliding locking pin is inserted on the sleeve 16. When the footrest 14 is pulled up and down, the lifting column slides in the sleeve 16, and the locking pin can enter different gear holes to lock the height of the footrest 14, thereby realizing the lifting and lowering of the footrest 14; the sleeve 16 is closed and the lower part of the sleeve 16 protrudes downward from the base 311, and the friction pad 8 is arranged on the lower end surface of the sleeve 16.

[0070] Embodiment 2: The only difference between this embodiment and embodiment 1 is that the elastic member is a spring 12 and there is no auxiliary elastic member.

[0071] Specifically, if Figure 10 As shown, the elastic member is a spring 12, and a baffle 13 is fixed near the head of the screw 91. One end of the spring 12 is slotted and fixed between the head of the screw 91 and the baffle 13. The other end of the spring 12 abuts against the mounting portion 32 and provides an upward elastic force for the pedal 3.

[0072] Example 3: The only difference between this example and Example 2 is that the spring piece 12 is fixed on the base 1.

[0073] Specifically, if Figure 11 As shown, the elastic member is a spring 12, one end of which is fixed to the base 1, and the other end of the spring 12 abuts or is inserted into the mounting portion 32. In this embodiment, the spring 12 abuts against the mounting portion 32; the spring 12 has a downward pre-deformation, and by having one end fixed to the base 1 and the other end acting on the mounting plate 32, it always provides an upward elastic force for the pedal member 3, thereby making the pedal member 3 vacant without being subjected to force; one end of the spring 12 is fixed to the base 1, and a hole can be opened on the base 1 to allow the spring 12 to be inserted into the base 1, or the spring 12 can be injection-molded in the base 1 to achieve this. In this embodiment, the spring 12 is directly fixed to the base 1 with screws.

[0074] Example 4: The only difference between this example and Example 1 is that the spring 25 is arranged above the mounting plate 32.

[0075] Specifically, if Figure 12-16As shown, the support leg 102 is provided with a downward guide portion 18, the guide portion 18 is provided with a mounting groove 19, a vertical guide column 20 is provided in the mounting groove 19, the guide column 20 is provided with a floating plate 21 that can move up and down, a mounting plate 22 is provided at the notch of the mounting groove 19, the mounting plate 22 is fixedly connected to the guide column 20 by a first screw 23 from bottom to top, the guide portion 18 is locked with the floating plate 21 by two second screws 24 from bottom to top, the second screws 24 pass through the guide portion 18 The mounting plate 22 is mounted on the floating plate 21, and two springs 25 are provided between the mounting plate 22 and the floating plate 21. The two springs 25 are respectively mounted on the second screws 24. The springs 25 have a compressed pre-deformation to always provide an upward elastic force for the pedal member 3, so that the pedal member 3 is lifted in the air without being subjected to force. When the user steps on the pedal member 3, the weight of the foot drives the pedal member 3 to move downward, and the floating plate 21 also moves in the mounting groove 19, and the springs 25 are further compressed.

[0076] Example 5: The only difference between this example and Example 1 is that the mounting portion and the base are rotatably connected via a rotating shaft and corresponding elastic members are provided. Specifically:

[0077] like Figure 17-19 As shown, a rotating seat 26 is protruded from the bottom of the two forward supporting legs 102, and the mounting portion 32 is located beside the rotating seat 26. A rotating shaft 27 is inserted into the mounting portion 32 and the rotating seat 26 on the same side, so that the footrest 3 can be installed on the base 1 with slight rotation. Furthermore, in the vertical direction, there is a gap between the supporting legs 102 and the mounting portion 32, and a spring 25 is provided in the gap. The spring 25 is configured to enable the bottom of the footrest 3 to be lifted off the ground when no force is applied. Specifically, when the spring 25 is arranged in front of the rotating shaft 27, the spring 25 has a pre-tensioned deformation and always applies an upward elastic force F to the mounting portion 32; alternatively, when the spring 25 is arranged behind the rotating shaft, the spring 25 has a pre-compressed deformation and uses an elastic force F' to apply a downward elastic force F' to the mounting portion 32. In both schemes of this embodiment, the elastic force of the spring 25 can be applied to the mounting portion 32, so that the front end of the footrest 3 can touch the ground and brake when the footrest 3 is stepped on, and return to the air after releasing it.

[0078] Example 6: The only difference between this example and example 5 is that a torsion spring 28 is provided on the rotating shaft 27. Figure 20 As shown, the two torsion arms of the torsion spring 28 are respectively in contact with the rotating seat 26 and the mounting portion 32 . The elastic force of the torsion spring 28 causes the front end of the pedal member 3 to tend to tilt upward and fly into the air.

[0079] Example 7: The only difference between this example and Example 6 is that the mounting portion 32 is located between the two forward-facing support legs 102, and the mounting portion 32 and the support legs 102 on the same side are located next to each other, and the support legs 102 and the mounting portion 32 are rotatably connected by providing a rotating shaft 27, as shown in FIG. Figure 21 shown.

Claims

1. A bottom support member of a chair, characterized in that: include: base; Rollers are disposed on the base, the rollers being configured to enable the bottom support member to move on the ground; a footrest configured to have a footrest function; The footrest is movably arranged on the base, and includes a footrest portion for resting the foot and a mounting portion for connecting with the base. The footrest portion and the mounting portion are connected together. An elastic member is provided between the mounting portion and the base. The elastic member is configured to act on the footrest and always give the footrest an upward elastic force. The bottom support member also has an initial state and a locked state. In the initial state, the elastic member acts on the pedal member, so that the pedal member is lifted off the ground, and the roller can roll on the ground to move the bottom support member; in the locked state, the footrest is subjected to a downward force, and the elastic member is deformed to cause the pedal member to move downward until it contacts the ground, thereby locking the movement of the bottom support member.

2. The bottom support member of the chair according to claim 1, characterized in that: The mounting portion is located below the base. A screw is provided below the base. The screw passes through the mounting portion from bottom to top and is connected to the base. There is a gap between the lower end surface of the mounting portion and the head of the screw.

3. The bottom support member of the chair according to claim 2, characterized in that: The elastic member is arranged between the head of the screw and the mounting portion, and two ends of the elastic member are respectively in contact with the head of the screw and the mounting portion.

4. The bottom support member of the chair according to claim 3, characterized in that: The mounting portion is provided with a receiving groove which is open downwards; an avoidance hole is provided on the end surface of the receiving groove, and the screw passes through the avoidance hole and is connected with the base; the elastic piece is sleeved on the screw and is located in the receiving groove.

5. The bottom support member of the chair according to claim 3, characterized in that: The elastic member is a spring.

6. The bottom support member of the chair according to claim 3, characterized in that: An auxiliary elastic member is further provided between the mounting portion and the base. The auxiliary elastic member is a spring. One end of the spring is provided on the screw, and the other end of the spring abuts against the mounting portion.

7. The bottom support member of the chair according to claim 6, characterized in that: A blocking piece is sleeved on the screw, the blocking piece is located in the gap, the lower end of the elastic member abuts against the blocking piece; the spring piece is arranged between the blocking piece and the head of the screw.

8. The bottom support member of the chair according to claim 6, characterized in that: The shape of the shrapnel is a downwardly curved arch.

9. The bottom support member of the chair according to claim 2, characterized in that: The elastic member is a spring sheet, one end of which is fixed on the screw, and the other end of which is in contact with the mounting portion.

10. The bottom support member of the chair according to claim 1, characterized in that: The elastic member is a spring, the mounting portion is located below the base, the elastic member is arranged above the mounting portion, and two ends of the elastic member are respectively connected to the base and the mounting portion.

11. The bottom support member of the chair according to claim 1, characterized in that: The elastic member is a spring sheet, one end of which is fixed on the base, and the other end of which is abutted against or inserted into the mounting portion.

12. The bottom support member of the chair according to claim 1, characterized in that: The roller is a universal roller.

13. The bottom support member of the chair according to claim 1, characterized in that: A friction pad is provided at the lower end of the pedal piece.

14. The bottom support member of the chair according to claim 1, characterized in that: The base comprises a main body and at least two supporting legs extending outward from the main body, and the rollers are installed below the supporting legs.

15. The bottom support member of the chair according to claim 14, characterized in that: There are two supporting feet, and the two supporting feet are symmetrically arranged at the front end of the main body; the two supporting feet extend forward on the main body and extend toward the outside of the main body in the left and right directions.

16. The bottom support member of the chair according to claim 15, characterized in that: There are two mounting parts, which are respectively located at the left and right ends of the footrest and below the two supporting legs. At least two elastic members are arranged at intervals between each mounting part and the supporting leg.

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