Office chair capable of being electrically controlled to ascend and descend

Abstract

The invention discloses an office chair capable of being electrically controlled to lift, which comprises a movable base, a chair body and a lifting device, and is characterized in that the lifting device comprises a first pipe with the lower end connected with the movable base and a second pipe comprising a second inner pipe and a second outer pipe, and the upper ends of the second inner pipe and the second outer pipe are both connected with the chair body; a floating piston capable of moving in the height direction is arranged in the space between the inner wall of the second outer pipe and the outer wall of the second inner pipe and divides the space into a first hydraulic cavity and a gas cavity, the gas cavity applies upward acting force to the floating piston, and a second hydraulic cavity is formed in the second inner pipe. A fluid channel is arranged between the first hydraulic cavity and the second hydraulic cavity; the control valve is arranged in the fluid channel to control the communication state of the fluid channel; the electric control mechanism is arranged on the seat body to control opening and closing of the control valve; by arranging the control valve and the electric control mechanism, a user can electrically control opening and closing of the fluid channel so as to adjust the height of the seat body.

Description

Technical Field

[0001] The invention relates to the technical field of office supplies, and in particular to an office chair capable of electrically controlling the lifting and lowering thereof. Background Art

[0002] Existing office chairs have hydraulic and pneumatic height adjustment mechanisms. However, no matter which type of office chair, the height adjustment mechanism is controlled by a lever arranged under the seat body, that is, it is manually controlled. There are few office chairs with electrically controlled lifting on the market. Summary of the invention

[0003] The purpose of the present invention is to provide an office chair that can be electrically controlled to rise and fall, aiming to solve at least one technical problem in the above-mentioned prior art.

[0004] In order to solve the above technical problems, the object of the present invention is achieved through the following technical solutions: providing an office chair that can be electrically controlled to rise and fall, comprising a movable base, a seat body and a lifting device for connecting the movable base and the seat body, the lifting device comprising:

[0005] a first tube, the lower end of which is connected to the movable base;

[0006] A second tube, comprising a second inner tube and a second outer tube, wherein the upper ends of the second inner tube and the second outer tube are connected to the seat body, and the lower ends of the second inner tube and the second outer tube are movably inserted into the first tube;

[0007] A floating piston movable in the height direction is movably arranged in the space between the inner wall of the second outer tube and the outer wall of the second inner tube, the floating piston divides the space into a first hydraulic chamber and a gas chamber, the gas chamber exerts an upward force on the floating piston, and a second hydraulic chamber is arranged inside the second inner tube;

[0008] A fluid channel is provided between the first hydraulic chamber and the second hydraulic chamber;

[0009] The office chair also includes:

[0010] a control valve, disposed in the fluid channel to control a communication state of the fluid channel;

[0011] The electric control mechanism is arranged on the seat body to control the opening and closing of the control valve.

[0012] Furthermore, the seat body includes a connecting base, which is connected to the second outer tube and the second inner tube. A first channel, a second channel and a connecting channel are arranged inside the connecting base. The first channel connects to the first hydraulic chamber, the second channel connects to the second hydraulic chamber, and the connecting channel connects the first hydraulic chamber and the second hydraulic chamber. The control valve is arranged in the connecting channel to control the opening and closing state of the connecting channel.

[0013] Further, the communication channel has a tapered orifice at one end facing the first channel;

[0014] The control valve includes a valve stem having a conical head matching the conical orifice and a rod body penetrating the connecting passage, the cross-sectional area of ​​the rod body being smaller than the area of ​​the side of the conical head facing the first passage, and a gap being provided between the rod body and the inner wall of the connecting passage.

[0015] Further, the electric control mechanism includes:

[0016] A motor, disposed on the seat body or the connecting base;

[0017] A driving cam is connected to the driving end of the motor, wherein the driving cam has a cam surface, and the cam surface is configured to drive the rod body to move linearly along the extending direction of the connecting channel.

[0018] Furthermore, the driving cam comprises:

[0019] A cylinder coaxially connected to the output shaft of the motor;

[0020] The cam body is eccentrically arranged relative to the cylinder, and is configured so that when the motor drives the cylinder to rotate, the cam body can contact the rod body to drive the rod body to move linearly along the extending direction of the connecting channel.

[0021] Furthermore, a rolling body is rotatably provided on the cam, and the rolling body is configured such that when the motor drives the cylindrical body to rotate, the rolling body can roll in contact with the rod body to drive the rod body to move linearly along the extending direction of the connecting channel.

[0022] Furthermore, it also includes an electric switch, which is electrically connected to the motor.

[0023] Furthermore, the electric switch is arranged on the seat body or other components outside the seat body.

[0024] Furthermore, it also includes a battery, which is arranged on the seat body and electrically connected to the motor to provide electrical power to the motor.

[0025] The embodiment of the present invention provides an office chair that can be electrically controlled to rise and fall. By arranging a control valve and an electric control mechanism, a user can electrically control the opening and closing of a fluid channel to adjust the height of a seat body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 A schematic diagram of the overall structure of an office chair provided by an embodiment of the present invention;

[0028] Figure 2 The embodiment of the present invention provides Figure 1 Enlarged schematic diagram of part A.

[0029] Description of the symbols in the figure:

[0030] 1. Removable base;

[0031] 2. Seat body;

[0032] 3. Lifting device; 31. First tube; 311. First inner tube; 312. First outer tube; 32. Second tube; 321. Second inner tube; 322. Second outer tube; 33. Floating piston; 34. First hydraulic chamber; 35. Gas chamber; 36. Second hydraulic chamber;

[0033] 4. Fluid passage; 41. First passage; 42. Second passage; 43. Communication passage; 44. Conical orifice;

[0034] 5. control valve; 51. valve stem; 511. conical head; 512. stem body;

[0035] 6. Electric control mechanism; 61. Motor; 62. Driving cam; 621. Cylinder; 622. Cam body; 623. Rolling body. DETAILED DESCRIPTION

[0036] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0037] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0040] See also Figure 1 to Figure 2 The present embodiment provides an office chair that can be electrically controlled to rise and fall, comprising a movable base 1, a seat body 2, a lifting device 3, a control valve 5 and an electric control mechanism 6.

[0041] The lifting device 3 is used to connect the movable base 1 and the seat body 2, and includes a first tube 31 and a second tube 32.

[0042] The lower end of the first tube 31 is connected to the movable base 1;

[0043] The second tube 32 includes a second inner tube 321 and a second outer tube 322. The upper ends of the second inner tube 321 and the second outer tube 322 are connected to the seat body 2, and the lower ends of the second inner tube 321 and the second outer tube 322 are movably inserted in the first tube 31.

[0044] A floating piston 33 that can move in the height direction is movably arranged in the space between the inner wall of the second outer tube 322 and the outer wall of the second inner tube 321. The floating piston 33 separates the space into a first hydraulic chamber 34 and a gas chamber 35. The gas chamber 35 exerts an upward force on the floating piston 33. A second hydraulic chamber 36 is arranged inside the second inner tube 321.

[0045] A fluid passage is provided between the first hydraulic chamber 34 and the second hydraulic chamber 36 .

[0046] The control valve 5 is arranged in the fluid channel to control the communication state of the fluid channel;

[0047] The electric control mechanism 6 is disposed on the seat body 2 to control the opening and closing of the control valve 5 .

[0048] In the above design, firstly, the seat body 2 and the movable base 1 are conventional technical means in this field and will not be described in detail.

[0049] Secondly, the upper ends of the first tube 31 and the second tube 32 are connected to the seat body 2 to form a seal at the upper ends of the first tube 31 and the second tube 32, so that the first hydraulic chamber 34 can be defined between the seat body 2, the inner wall of the second outer tube 322, the outer wall of the second inner tube 321 and the floating piston 33.

[0050] Furthermore, the first tube 31 includes a first outer tube 312 and a first inner tube 311. The first outer tube 312 is slidably sealed with the second outer tube 322, and the second outer tube 322 is arranged inside the first outer tube 312. A fixed piston is arranged at the upper end of the first inner tube 311, and the fixed piston is slidably sealed with the inner wall of the second inner tube 321 to define a second hydraulic chamber 36 between the fixed piston, the inner wall of the second inner tube 321 and the seat body 2.

[0051] With such a design, due to the effect of the gas in the gas chamber 35 on the floating piston 33, when the user is not sitting on the seat body 2, the pressure in the first hydraulic chamber 34 is greater than the pressure in the second hydraulic chamber 36. When the electric control mechanism 6 opens the control valve 5 to make the fluid channel conductive, the fluid in the first hydraulic chamber 34 flows to the second hydraulic chamber 36, the volume of the fluid in the second hydraulic chamber 36 increases, and the second tube 32 rises to increase the height of the seat body 2.

[0052] When the user sits on the seat body 2, the fluid in the second hydraulic chamber 36 is pressurized and the pressure increases, while in the first hydraulic chamber 34, due to the setting of the floating piston 33, the pressure in the first hydraulic chamber 34 is lower than that in the second hydraulic chamber 36. At this time, if the electric control mechanism 6 opens the control valve 5 to make the fluid channel conductive, the fluid in the second hydraulic chamber 36 flows to the first hydraulic chamber 34, the volume of the fluid in the second hydraulic chamber 36 decreases, and the height of the seat body 2 drops.

[0053] Furthermore, the seat body 2 includes a connecting base, which is connected to the second outer tube 322 and the second inner tube 321. A first channel 41, a second channel 42 and a connecting channel 43 are provided inside the connecting base. The first channel 41 connects to the first hydraulic chamber 34, the second channel 42 connects to the second hydraulic chamber 36, and the connecting channel 43 connects the first hydraulic chamber 34 and the second hydraulic chamber 36. The control valve 5 is provided in the connecting channel 43 to control the opening and closing state of the connecting channel 43.

[0054] In the above design, the first channel 41 , the second channel 42 and the connecting channel 43 together constitute the above fluid channel, and the control valve 5 is arranged in the connecting channel 43 to control the conduction state of the first hydraulic chamber 34 and the second hydraulic chamber 36 .

[0055] More specifically, the connecting passage 43 has a tapered orifice 44 at one end facing the first passage 41; the control valve 5 includes a valve stem 51, the valve stem 51 has a tapered head 511 matching the tapered orifice 44 and a rod body 512 passing through the connecting passage 43, the cross-sectional area of ​​the rod body 512 is smaller than the area of ​​the side of the tapered head 511 facing the first passage 41, and there is a gap between the rod body 512 and the inner wall of the connecting passage 43.

[0056] With such a design, the conical head 511 of the valve stem 51 can contact the conical orifice 44 of the communication channel 43 to form a sealed connection, and at this time, the position is the closed position of the communication channel 43. Conversely, the position where the conical head 511 is separated from the conical orifice 44 is the open position of the communication channel 43. And because the cross-sectional area of ​​the rod body 512 is smaller than the area of ​​the side of the conical head 511 facing the first channel 41, the pressure on the side is much greater than the pressure on the annular side where the end of the conical head 511 connected to the rod body 512 is located, so that even if the valve stem 51 is not maintained in the closed position of the communication channel 43 by the electric control mechanism 6, the valve stem 51 is always subjected to the hydraulic pressure toward the closed position, so that the valve stem 51 moves to the closed position and cuts off the communication channel 43, forming a self-locking effect.

[0057] In another embodiment, the electric control mechanism 6 includes a motor 61 and a driving cam 62; wherein,

[0058] The motor 61 is disposed on the seat body 2 or the connection base;

[0059] The driving cam 62 is connected to the driving end of the motor 61 . The driving cam 62 has a cam surface. The cam surface is configured to drive the rod body 512 to move linearly along the extending direction of the communication channel 43 .

[0060] Thus, the driving cam 62 can drive the valve stem 51 to move to the open position, and when the driving cam 62 is not in contact with the rod body 512, the valve stem 51 automatically returns to the sealing position under the action of the above-mentioned hydraulic pressure.

[0061] The driving cam 62 includes a cylindrical body 621 and a cam body 622.

[0062] The cylinder 621 is coaxially connected to the output shaft of the motor 61;

[0063] The cam body 622 is eccentrically arranged relative to the cylinder 621 , and is configured so that when the motor 61 drives the cylinder 621 to rotate, the cam body 622 can contact the rod body 512 to drive the rod body 512 to move linearly along the extension direction of the connecting channel 43 .

[0064] In the above design, the cam body 622 is eccentrically arranged so that only when the motor 61 drives the cylinder 621 to rotate a certain angle, the cam body 622 will contact or separate from the rod body 512 to push the valve stem 51 to move to the open position or make the valve stem 51 return to the closed position under the action of the above-mentioned hydraulic pressure.

[0065] Furthermore, a rolling body 623 is rotatably provided on the cam, and the rolling body 623 is configured to roll with the rod body 512 to drive the rod body 512 to move linearly along the extension direction of the connecting channel 43 when the motor 61 drives the cylinder 621 to rotate.

[0066] In this embodiment, the rolling body 623 can be a bearing or an annular body rotatably mounted on the cam body 622. By providing the rolling body 623, the sliding friction between the cam body 622 and the rod body 512 is converted into rolling friction, which effectively reduces the energy loss between the two, reduces the performance requirements for the motor 61, and also reduces the wear between the cam body 622 and the valve stem 51.

[0067] In a more specific embodiment, the electrically controllable lifting office chair further comprises an electric switch and a battery. The electric switch is disposed on the seat body 2 or on other components outside the seat body 2, such as on a desk matched with the office chair, and the electric switch is electrically connected to the motor 61, so that the user can control the motor 61 by pressing the electric switch to further adjust the height of the office chair.

[0068] The battery is disposed at the bottom of the seat body 2 , and is electrically connected to the electric switch and the motor 61 to provide electric power to the motor 61 and the electric switch.

[0069] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. An office chair capable of electrically controlling the lifting and lowering of the chair, comprising a movable base (1), a seat body (2), and a lifting device (3) for connecting the movable base (1) and the seat body (2), characterized in that: The lifting device (3) comprises: A first tube (31), the lower end of which is connected to the movable base (1); The second tube (32) comprises a second inner tube (321) and a second outer tube (322), the upper ends of the second inner tube (321) and the second outer tube (322) are connected to the seat body (2), and the lower ends of the second inner tube (321) and the second outer tube (322) are movably inserted into the first tube (31); A floating piston (33) movable in the height direction is movably arranged in the space between the inner wall of the second outer tube (322) and the outer wall of the second inner tube (321); the floating piston (33) divides the space into a first hydraulic chamber (34) and a gas chamber (35); the gas chamber (35) exerts an upward force on the floating piston (33); and a second hydraulic chamber (36) is arranged inside the second inner tube (321); A fluid channel is provided between the first hydraulic chamber (34) and the second hydraulic chamber (36); The office chair also includes: a control valve (5), arranged in the fluid channel to control the communication state of the fluid channel; An electric control mechanism (6) is arranged on the seat body (2) to control the opening and closing of the control valve (5).

2. The electrically controllable lifting office chair according to claim 1, characterized in that: The seat body (2) includes a connecting base, which is connected to the second outer tube (322) and the second inner tube (321); a first channel (41), a second channel (42) and a connecting channel (43) are provided inside the connecting base; the first channel (41) is connected to the first hydraulic chamber (34); the second channel (42) is connected to the second hydraulic chamber (36); the connecting channel (43) is connected to the first hydraulic chamber (34) and the second hydraulic chamber (36); the control valve (5) is provided in the connecting channel (43) to control the opening and closing state of the connecting channel (43).

3. The electrically controllable lifting office chair according to claim 2, characterized in that: The communication channel (43) has a tapered opening (44) at one end facing the first channel (41); The control valve (5) comprises a valve stem (51), the valve stem (51) having a conical head (511) matching the conical orifice (44) and a rod body (512) penetrating the connecting passage (43), the cross-sectional area of ​​the rod body (512) being smaller than the area of ​​the side surface of the conical head (511) facing the first passage (41), and a gap being provided between the rod body (512) and the inner wall of the connecting passage (43).

4. The electrically controllable lifting office chair according to claim 3, characterized in that: The electric control mechanism (6) comprises: A motor (61) is arranged on the seat body (2) or the connecting base; A driving cam (62) is connected to the driving end of the motor (61), wherein the driving cam (62) has a cam surface, and the cam surface is configured to drive the rod body (512) to move linearly along the extension direction of the connecting channel (43).

5. The electrically controllable lifting office chair according to claim 4, characterized in that: The driving cam (62) comprises: A cylinder (621) coaxially connected to the output shaft of the motor (61); The cam body (622) is eccentrically arranged relative to the cylindrical body (621), and the cam body (622) is configured so that when the motor (61) drives the cylindrical body (621) to rotate, the cam body (622) can contact the rod body (512) to drive the rod body (512) to move linearly along the extension direction of the connecting channel (43).

6. The electrically controllable lifting office chair according to claim 5, characterized in that: A rolling body (623) is rotatably provided on the cam, and the rolling body (623) is configured such that when the motor (61) drives the cylindrical body (621) to rotate, the rolling body (623) can roll in contact with the rod body (512) to drive the rod body (512) to move linearly along the extension direction of the connecting channel (43).

7. The electrically controllable lifting office chair according to claim 6, characterized in that: It also includes an electric switch, which is electrically connected to the motor (61).

8. The electrically controllable lifting office chair according to claim 1, characterized in that: The electric switch is arranged on the seat body (2) or on other components outside the seat body (2).

9. The electrically controllable lifting office chair according to claim 4, characterized in that: It also includes a battery, which is arranged on the seat body (2) and electrically connected to the motor (61) to provide electric power to the motor (61).

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