Chair back lifting structure and seat

Abstract

The utility model relates to the field of chairs, and particularly discloses a chair back lifting structure and a chair, the chair back lifting structure is characterized in that the chair back lifting structure comprises a fixed pipe and a lifting pipe which is located on the fixed pipe and can move up and down relative to the fixed pipe, a nut block is fixed in the fixed pipe, a mounting part is arranged in the lifting pipe, the mounting part is rotatably connected with a screw rod, and the screw rod is connected with a nut. The screw rod penetrates through the nut block and is in threaded connection with the nut block; a handle is arranged on the side edge of the lifting pipe and is in transmission fit with the lead screw through a transmission mechanism. The lifting device has the effects of stepless lifting adjustment and convenience in adjustment.

Description

Technical Field

[0001] The present application relates to the field of chairs, and in particular to a chair back lifting structure and a chair. Background Art

[0002] Existing seat back lifts are primarily achieved through a buckle and slot system. Multiple slots are spaced along the height of one telescopic tube, and a lockable buckle is located on the other tube. When the buckle is released from the slot, the height can be adjusted. However, this adjustment method only allows for segmented adjustment due to the generally large spacing between the slots. Utility Model Content

[0003] In order to improve the problem that the prior art can only adjust in sections, the present application provides a chair back lifting structure.

[0004] The chair back lifting structure provided in this application adopts the following technical solution:

[0005] A chair back lifting structure, characterized in that it includes: a fixed tube, a lifting tube located on the fixed tube and capable of lifting and lowering relative to the fixed tube, a nut block fixed in the fixed tube, a mounting portion in the lifting tube, a screw rod rotatably connected to the mounting portion, the screw rod passing through the nut block and threadedly connected to the nut block; a handle is provided on the side of the lifting tube, and the handle is engaged with the screw rod through a transmission mechanism.

[0006] Optionally, the transmission mechanism includes a rotating shaft fixed to the handle, a first bevel gear fixed to the rotating shaft, and a second bevel gear fixed to the screw rod, and the first bevel gear and the second bevel gear are directly or indirectly meshed.

[0007] Optionally, a limiting portion is formed on the top of the screw rod, and the mounting portion has a limiting groove corresponding to the limiting portion. The limiting portion is located in the limiting groove so that the screw rod can only rotate relative to the mounting portion but cannot move axially.

[0008] Optionally, the rotating shaft includes a rod body, a rotating sleeve that is sleeved on the rod body and rotates synchronously with the rod body, and a sliding sleeve that is sleeved on the rod body and can move axially relative to the rod body and can rotate synchronously with the rod body, and the handle is fixed to the sliding sleeve; the rotating sleeve is rotatably connected to the mounting part.

[0009] Optionally, the handle is exposed outside the lifting tube or is at least partially hidden inside the lifting tube.

[0010] Optionally, a groove is provided on the handle, and a grip is provided in the groove. The grip is rotatably mounted on the handle and has at least two states: hidden in the groove or rotated out of the groove.

[0011] Optionally, the handle is provided with a connection hole, a grip is mounted on the handle, and the grip has a connection portion connected to the connection hole.

[0012] Optionally, the cross section of the contact area between the lifting tube and the fixed tube is non-circular.

[0013] A chair includes the chair back lifting structure, characterized in that it also includes a base, a seat plate, and a backrest, the fixed tube is installed on the base, the seat plate is installed on the fixed tube, and the backrest is installed on the lifting tube.

[0014] To sum up, the present application includes at least one of the following beneficial technical effects: the present application can conveniently drive the screw to rotate and lift by setting a handle, realize stepless adjustment through the screw, and the handle is set on the side, which is more convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the overall structure of the seat according to the embodiment of the present application;

[0016] Figure 2 yes Figure 1 A top view of

[0017] Figure 3 It is along Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0018] Figure 4 yes Figure 3 An enlarged schematic diagram of part B;

[0019] Figure 5 yes Figure 1 Schematic diagram of the coordination between the middle transmission mechanism, the handle and the grip;

[0020] Figure 6 This is a schematic diagram of the state where the handle is hidden;

[0021] Figure 7 This is a schematic diagram of the state where the handle is extended.

[0022] Figure numerals: 1. fixing tube; 2. lifting tube; 3. nut block; 4. mounting portion; 5. screw rod; 6. handle; 7. limiting portion; 8. limiting groove; 9. rotating shaft; 10. first bevel gear; 11. second bevel gear; 12. accommodating groove; 13. rod body; 14. rotating sleeve; 15. sliding sleeve; 16. handle; 17. groove; 18. base; 19. seat plate; 20. backrest. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-7 This application is described in further detail.

[0024] Example 1: A chair back lift structure includes a fixed tube 1 and a lift tube 2 positioned on the fixed tube 1 and capable of lifting and lowering relative to the fixed tube 1. A nut block 3 is fixed within the fixed tube 1. The lift tube 2 includes a mounting portion 4, to which a screw 5 is rotatably connected. The screw 5 passes through the nut block 3 and is threadedly connected thereto. A handle 6 is provided on the side of the lift tube 2, which is coupled to the screw 5 via a transmission mechanism. Turning the handle 6 rotates the screw 5, which in turn moves the lift tube 2 up and down. Lifting and moving up and down here refer to the same thing. Because the handle 6 is located on the side of the lift tube 2, the screw 5 must be driven by a transmission mechanism to rotate. The circumferential limit of the lift tube 2 is achieved by providing a non-circular cross-section in the contact area between the lift tube 2 and the fixed tube 1. When the lift tube 2 is inserted into the fixed tube 1, the cross-section of the contact area can be understood as the outer wall profile of the lift tube 2 or the inner wall profile of the fixed tube 1. In this embodiment, the lifting tube 2 is sleeved outside the fixed tube 1, so the cross section of the contact area is the inner wall contour section of the lifting tube 2 or the outer wall contour section of the fixed tube 1. In this embodiment, the inner and outer cross sections of the fixed tube 1 and the lifting tube 2 are the same, both having a runway-like structure.

[0025] The screw rod 5 can only be connected to the mounting portion 4 in a rotatable manner. The screw rod 5 and the mounting portion 4 are lifted and lowered at the same time. Since the mounting portion 4 and the lifting tube 2 are fixed, the lifting tube 2 also moves synchronously. Specifically, a limiting portion 7 is formed near the top of the screw rod 5. The mounting portion 4 is a frame-type structure. The mounting portion 4 has a limiting groove 8 corresponding to the limiting portion 7. The limiting portion 7 is located in the limiting groove 8 so that the screw rod 5 can only rotate relative to the mounting portion 4 and cannot move axially. The limiting portion 7 can be integrally formed with the screw rod 5, or it can be fixed to the screw rod 5 by welding or other means, or locked to the screw rod 5 by other means. Here, the limiting portion 7 is a circular ring. The number of circular rings is set according to demand, and two are set in this embodiment.

[0026] The transmission mechanism includes a rotating shaft 9 fixed to the handle 6, a first bevel gear 10 fixed to the rotating shaft 9, and a second bevel gear 11 fixed to the screw rod 5. The first bevel gear 10 and the second bevel gear 11 are directly or indirectly meshed. In this embodiment, the first bevel gear 10 and the second bevel gear 11 are directly meshed.

[0027] The handle 6 can be exposed outside the lifting tube 2 or at least partially concealed within the lifting tube 2. Generally, to reduce size or for safety reasons, the handle 6 is completely concealed within the lifting tube 2. Specifically, a portion of the sidewall of the lifting tube 2 is recessed to form a receiving groove 12, and the handle 6 is positioned within the receiving groove 12. Because the handle 6 needs to rotate, it is necessary to allow it to move out of the receiving groove 12; otherwise, due to the constraints of the receiving groove 12, the handle 6 cannot rotate.

[0028] Specifically, the rotating shaft 9 includes a rod body 13, a rotating sleeve 14 that fits over the rod body 13 and rotates synchronously with the rod body 13, and a sliding sleeve 15 that fits over the rod body 13 and can move axially relative to the rod body 13 and rotate synchronously with the rod body 13. The handle 6 is fixed to the sliding sleeve 15; the first bevel gear 10 is fixed to the rotating sleeve 14, and the rotating sleeve 14 is rotatably connected to the mounting portion 4. The rod body 13 and the rotating sleeve 14 can be integrally formed or welded. The cross-section of the rod body 13 is configured as a non-circular rod structure, specifically a hexagonal one. In this embodiment, the sliding sleeve 15 has a hexagonal inner cavity, thereby enabling the sliding sleeve 15 to move axially relative to the rod body 13 and rotate synchronously with the rod body 13.

[0029] As a more preferred embodiment, the handle 6 is connected to a grip 16, wherein the grip 16 can be exposed or concealed. When exposed, the handle 6 is provided with a connection hole, and the grip 16 is mounted on the handle 6. The grip 16 has a connecting portion connected to the connection hole. Specifically, the connecting portion is threadedly connected to the connection hole, or the grip 16 and the handle 6 can be fixed together by a snap connection or directly.

[0030] When hidden, a groove 17 is provided on the handle 6, and a grip 16 is provided in the groove 17. The grip 16 is rotatably mounted on the handle 6 via the rotating shaft 9. By rotating the grip 16, the grip 16 can be in two states: hidden in the groove 17 or rotated out of the groove 17.

[0031] The implementation principle of the chair back lifting structure of an embodiment of the present application is: through the handle 16, the handle 16 drives the handle 6, the handle 6 drives the rotating shaft 9, the rotating shaft 9 drives the screw rod 5 to rotate, and at the same time the screw rod 5 rises and falls relative to the nut block 3, and the lifting of the screw rod 5 drives the lifting tube 2 to move up and down.

[0032] Example 2: A chair comprising Example 1, a base 18, a seat plate 19, and a backrest 20. The fixed tube 1 is mounted on the base 18, the seat plate 19 is mounted on the fixed tube 1, and the backrest 20 is mounted on the lifting tube 2. The rotating handle 6 and the grip 16 are primarily used to adjust the height of the backrest 20 to accommodate people of different heights.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A chair back lifting structure, characterized by: It includes a fixed tube and a lifting tube located on the fixed tube and capable of moving up and down relative to the fixed tube. A nut block is fixed in the fixed tube, and a mounting portion is provided in the lifting tube. A screw rod is rotatably connected to the mounting portion, and the screw rod passes through the nut block and is threadedly connected to the nut block. A handle is provided on the side of the lifting tube, and the handle is coupled with the screw rod through a transmission mechanism.

2. The chair back lifting structure according to claim 1, characterized in that: The transmission mechanism includes a rotating shaft fixed to the handle, a first bevel gear fixed to the rotating shaft, and a second bevel gear fixed to the screw rod, and the first bevel gear and the second bevel gear are directly or indirectly meshed.

3. The chair back lifting structure according to claim 1, characterized in that: A limiting portion is formed near the top of the screw rod, and the mounting portion has a limiting groove corresponding to the limiting portion. The limiting portion is located in the limiting groove so that the screw rod can only rotate relative to the mounting portion but cannot move axially.

4. The chair back lifting structure according to claim 2, characterized in that: The rotating shaft includes a rod body, a rotating sleeve sleeved on the rod body and rotating synchronously with the rod body, and a sliding sleeve sleeved on the rod body and capable of axially moving relative to the rod body and rotating synchronously with the rod body. The handle is fixed to the sliding sleeve; the rotating sleeve is rotatably connected to the mounting portion.

5. The chair back lifting structure according to claim 1, characterized in that: The handle is exposed outside the lifting tube or is at least partially hidden inside the lifting tube.

6. The chair back lifting structure according to claim 5, characterized in that: The handle is provided with a groove, the groove is provided with a grip, and the grip is rotatably mounted on the handle and has at least two states: hidden in the groove or rotated out of the groove.

7. The chair back lifting structure according to claim 5, characterized in that: The handle is provided with a connection hole, and a grip is mounted on the handle. The grip has a connection portion connected to the connection hole.

8. The chair back lifting structure according to claim 1, characterized in that: The cross section of the contact area between the lifting tube and the fixed tube is non-circular.

9. A chair comprising the chair back lifting structure according to any one of claims 1 to 8, characterized in that: It also includes a base, a seat plate, and a backrest. The fixing tube is installed on the base, the seat plate is installed on the fixing tube, and the backrest is installed on the lifting tube.

Images