Seat back lifting mechanism and study chair

Abstract

The present invention relates to the technical field of children's health household products, and more specifically, to a seat back lifting mechanism and a learning chair. The seat back lifting mechanism comprises a fixing tube, a seat lifting sleeve, a seat back lifting sleeve, a first screw rod, a second screw rod, a first rotating handle driving the first screw rod, and a second rotating handle driving the second screw rod. The seat back lifting mechanism of the present invention can realize synchronous or asynchronous lifting and lowering adjustment of the seat and the back of the chair, and the operation is labor-saving and convenient. Children of young age can independently complete the adjustment operation of the height of the back and the seat. The learning chair equipped with the seat back lifting mechanism is more suitable for children of young age, and has good economic and social benefits.

Description

Technical Field

[0001] The invention relates to the technical field of children's health household products, in particular to a seat back lifting mechanism and a study chair. Background Art

[0002] In the field of children's home learning supplies, existing children's learning chairs and posture correction chairs generally can only meet the function of seats, and adjusting the seat height and improving the comfort of the chair back are also one of the necessary functions of such seats.

[0003] In this industry, the height adjustment of the seat and backrest of most children's learning chairs and posture correction chairs on the chair frame is operated by screws or elastic clamping, which is relatively laborious. Currently, there are methods on the market to adjust the seat height by hand-cranking, but the height adjustment of the backrest is still achieved by external clamping. The height adjustment operation of the seat and backrest of existing learning chairs and posture correction chairs is relatively laborious, and children of younger ages cannot complete it manually independently. How to enable children of younger ages to independently adjust the seat and backrest height is a problem that needs to be solved urgently in this field. Summary of the invention

[0004] One of the purposes of the present invention is to provide a seat back lifting mechanism to solve the above technical problems.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A seat back lifting mechanism, characterized in that: it includes a fixed tube, a seat lifting sleeve, a seat back lifting sleeve, a first screw rod, a second screw rod, a first rotating handle driving the first screw rod and a second rotating handle driving the second screw rod; a first guide sleeve is inserted and assembled in the bottom port of the seat lifting sleeve, and the upper end of the fixed tube is inserted in the first guide sleeve; a second guide sleeve is inserted and assembled in the bottom port of the seat back lifting sleeve, and the upper end of the seat lifting sleeve is inserted in the second guide sleeve; the second screw rod is hollow inside, and its axial direction passes through the seat back lifting sleeve, and is assembled in the seat back lifting sleeve through a bearing; the upper end of the second screw rod is connected to the second rotating handle, and the lower end is threadedly connected to the upper end of the seat lifting sleeve; the first screw rod passes through the central cavity of the second screw rod and the seat lifting sleeve in turn, and is assembled in the seat lifting sleeve through a bearing; the top of the first screw rod passes through the second rotating handle, is connected to the first rotating handle, and the lower end is threadedly connected to the upper end of the fixed tube.

[0007] Specifically, the first rotating handle is located above the second rotating handle; the first rotating handle includes a rotating handle and a mounting seat, a first polygonal plug hole is provided at the center of the mounting seat, and L-shaped plug pins are symmetrically provided below the first polygonal plug hole; a polygonal column-shaped plug post matching the first polygonal plug hole is provided at the top of the first screw rod, and the plug post is plugged into the first polygonal plug hole;

[0008] The second rotating handle is a wheel-shaped structure, including a rotating wheel, a cylindrical seat located at the center of the rotating wheel, and a plurality of short rods connected between the rotating wheel and the cylindrical seat; the top of the cylindrical seat is provided with a long socket matching the L-shaped pin, and the bottom is provided with a second polygonal socket; the top of the second screw rod is provided with a polygonal plug matching the second polygonal socket, and the plug is plugged into the second polygonal hole.

[0009] Going further: the first screw rod includes a threaded section, a smooth cylindrical section, a polygonal column and a cylindrical short column; wherein the threaded section is threadedly connected to the first nut fixed in the top opening of the fixed tube; the portion where the cylindrical section is connected to the bearing in the seat lifting sleeve is provided with two upper and lower grooves, and the two grooves are respectively equipped with a retaining ring; a spring is provided between the top of the short column and the mounting seat.

[0010] Furthermore, the portion where the second screw rod is connected to the bearing in the seat back lifting sleeve is provided with two upper and lower grooves, each of which is equipped with a retaining ring; the lower end of the second screw rod is threadedly connected to the second nut fixed in the top opening of the seat lifting sleeve.

[0011] The second object of the present invention is to provide a learning chair, the technical solution adopted is:

[0012] A study chair, comprising a chair leg assembly, a seat assembly and a chair back assembly, characterized in that: it also includes the seat back lifting mechanism as described in claim 1; the bottom end of the fixing tube is fixedly assembled in the central recessed hole of the chair leg assembly; a transverse connecting arm is fixed on the lower end outer wall of the seat lifting sleeve; the seat assembly is fixedly assembled on the transverse connecting arm; a connecting ring is fixed on the back of the chair back assembly, the connecting ring is sleeved on the chair back lifting sleeve, and is locked and fixed by fastening bolts.

[0013] Beneficial effects: Compared with the prior art, the seat back lifting mechanism of the present invention can realize synchronous or asynchronous lifting and adjustment of the seat and the chair back, which is labor-saving and convenient to operate. Children of lower age groups can independently complete the adjustment operation of the seat back and the height of the chair seat. The learning chair equipped with the seat back lifting mechanism is more suitable for children of lower age groups and has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a structural schematic diagram of the seat back lifting mechanism of the present invention;

[0015] Figure 2 An exploded view of the seat back lifting mechanism of the present invention;

[0016] Figure 3 This is a schematic diagram of the bottom structure of the first rotating handle of the present invention;

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the first rotating handle of the present invention;

[0018] Figure 5 This is a schematic structural diagram of the second rotating handle of the present invention (I);

[0019] Figure 6 This is a structural schematic diagram of the second rotating handle of the present invention (II);

[0020] Figure 7 is a schematic structural diagram of the first screw rod of the present invention;

[0021] Figure 8 is a schematic structural diagram of the second screw rod of the present invention;

[0022] Fig. 9 The figure is a schematic diagram of the mechanism of the study chair of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Embodiment 1: Seat back lifting mechanism

[0025] Reference Figure 1-Figure 2 The seat back lifting mechanism described in this embodiment includes a fixing tube 7, a seat lifting sleeve 5, a seat back lifting sleeve 3, a first screw rod 14, a second screw rod 13, a first rotating handle 1 for driving the first screw rod 14, and a second rotating handle 2 for driving the second screw rod 13.

[0026] The bottom end of the seat lifting sleeve 5 is plugged with a first guide sleeve 6, the upper end of the fixed tube 7 is plugged into the first guide sleeve 6, and the top end thereof is fixedly equipped with a first nut 15. The bottom end of the seat back lifting sleeve 3 is plugged with a second guide sleeve 4, the upper end of the seat lifting sleeve 5 is plugged into the second guide sleeve 4, and the top end thereof is fixedly equipped with a second nut 12.

[0027] like Figure 8As shown, the second screw rod 13 is hollow inside, and its axial direction passes through the seat back lifting sleeve 3, and is assembled in the seat back lifting sleeve 3 through the bearing 11. The part where the second screw rod 13 and the bearing 11 in the seat back lifting sleeve 3 are connected is provided with two upper and lower clamping grooves, and the two clamping grooves are respectively equipped with clamping rings 10, so that the seat back lifting sleeve 3 is raised and lowered with the rotation of the second screw rod 13.

[0028] like Figure 5 , 6 As shown, the second rotating handle 2 is a wheel-shaped structure, including a rotating wheel 2A, a cylindrical seat 2B located at the center of the rotating wheel 2A, and a plurality of short rods 2C connected between the rotating wheel 2A and the cylindrical seat 2B; the bottom of the cylindrical seat 2B is provided with a second polygonal plug 2D. The top of the second screw rod 13 is provided with a polygonal plug 13A matching the second polygonal plug 2D, and the plug 13A is inserted into the second polygonal hole 2D. The lower end of the second screw rod 13 is threadedly connected with the second nut 12 fixed in the upper port of the seat lifting sleeve 5.

[0029] like Figure 3 , Figure 4 As shown, the first rotating handle 1 includes a rotating handle and a mounting seat, and a first polygonal socket 1A is provided at the center of the mounting seat; L-shaped pins 1B are symmetrically provided below the first polygonal socket 1A, and a long socket 2E matching the L-shaped pin 1B is provided on the top of the columnar seat 2B.

[0030] like Figure 7 As shown, the first screw rod 14 includes a threaded section 14A, a smooth cylindrical section 14B, a polygonal column 14C matching the first polygonal plug hole 1A, and a cylindrical short column 14D. The first screw rod 14 passes through the central cavity 13B of the second screw rod 13 and the seat lifting sleeve 5 in sequence, and the cylindrical section 14B is assembled in the seat lifting sleeve 5 through a bearing (the same as the bearing 11). The part where the cylindrical section 14B connects with the bearing in the seat lifting sleeve 5 is provided with two upper and lower grooves (not shown in the figure), and the two grooves are respectively equipped with snap rings (not shown in the figure, the same as the snap ring 10), so that the seat lifting sleeve 5 is raised and lowered with the rotation of the first screw rod 14. The threaded section 14A is threadedly connected with the first nut 15 fixed in the top opening of the fixed tube 7; the top end of the first screw rod 14 passes through the second rotating handle 2 upward, and the column 14C is inserted into the first polygonal plug hole 1A.

[0031] A cylindrical hole matching the short column 14D is provided above the first polygonal socket 1A of the mounting seat, and a cylindrical spring 9 is provided in the cylindrical hole. The short column 14D is inserted into the cylindrical hole to contact and compress the spring 9 to ensure that there is a small up and down movement stroke between the first rotating handle 1 and the top of the first screw rod 14.

[0032] The first rotating handle 1 is located above the second rotating handle 2, and can be stacked on the second rotating handle 2, or assembled on the top of the second rotating handle 2 by the L-shaped pin 1B and the long strip insertion hole 2E. The buckling assembly operation of the first rotating handle 1 and the second rotating handle 2 is as follows: the first rotating handle 1 is pressed down, the spring 9 is compressed, and the L-shaped pin 1B of the first rotating handle 1 is inserted into the long strip insertion hole 2E at the top of the second rotating handle 2, and then the first rotating handle 1 is rotated, and the L-shaped pin 1B is tightly buckled on the top of the rotating handle 2 under the elastic force of the spring 9.

[0033] Example 2: Study Chair

[0034] like Fig. 9 As shown, the study chair described in this embodiment includes a chair leg assembly 16, a seat assembly 17, a chair back assembly 18 and the seat back lifting mechanism. The bottom end of the fixing tube 7 is fixedly assembled in the central concave hole of the chair leg assembly 16; a transverse connecting arm 8 is fixed on the outer wall of the lower end of the seat lifting sleeve 5; the seat assembly 17 is fixedly assembled on the transverse connecting arm 8; a connecting ring 19 is fixed on the back of the chair back assembly 18, and the connecting ring 19 is sleeved on the chair back lifting sleeve 3 and is locked and fixed by a fastening bolt 20.

[0035] The seat back lifting mechanism of the present invention can realize synchronous or asynchronous lifting and lowering adjustment of the seat and the seat back. Specifically:

[0036] 1. Guide step lifting

[0037] The first rotating handle 1 is located above the second rotating handle 2 and is in an upwardly pulled and stacked state.

[0038] When the first rotating handle 1 is rotated, the first screw rod 14 rotates accordingly, and the first screw rod 14 spirally rises or falls around the first nut 15. Because the first nut 15 is screwed on the fixed tube, the first screw rod 14 is clamped by the retaining rings distributed on the upper and lower surfaces of the bearing. Therefore, when the first screw rod 14 rises or falls, it drives the seat lifting sleeve 5 to rise or fall, and then drives the seat assembly 17 to rise or fall.

[0039] Similarly, the top end of the second screw rod 13 is connected to the second rotating handle 2. When the second rotating handle 2 is rotated, the second screw rod 13 rotates accordingly, and the second screw rod 13 spirals up or down around the second nut 12. Because the second nut 12 is fixed on the seat lifting sleeve 5, the second screw rod 13 is clamped by the retaining rings 10 distributed on the upper and lower surfaces of the bearing 11. Therefore, when the second screw rod 13 rises or falls, it drives the seat back lifting sleeve 3 to rise or fall, and then drives the seat back assembly 18 to rise or fall.

[0040] 2. Synchronous lifting

[0041] The first rotating handle 1 is snap-fitted and installed on the top of the second rotating handle 2 , that is, the two L-shaped pins 1B at the bottom of the first rotating handle 1 are snap-fitted into the columnar seat 2B of the second rotating handle 2 .

[0042] When the second rotating handle 2 is rotated, the second screw rod 13 rotates accordingly, and at the same time, the first rotating handle 1 also rotates synchronously; when the second rotating handle 2 is rotated, the second screw rod 13 spirals up or down around the second nut 12, and the second screw rod 13 seat back lifting sleeve 3 rises or falls, thereby driving the seat back assembly 18 to rise or fall.

[0043] At the same time, the first rotating handle 1 rotates together with the second rotating handle 2, and the first screw rod 14 rotates accordingly. The first screw rod 14 spirally rises or falls around the first nut 15, thereby driving the seat lifting sleeve 5 to rise or fall, and further driving the seat assembly 17 to rise or fall.

[0044] The above shows and describes the basic principles, main features and technical effects of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments are only used to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A seat back lifting mechanism, characterized in that: The invention comprises a fixed tube (7), a seat lifting sleeve (5), a backrest lifting sleeve (3), a first screw rod (14), a second screw rod (13), a first rotating handle (1) for driving the first screw rod (14), and a second rotating handle (2) for driving the second screw rod (13); a first guide sleeve (6) is inserted and assembled in the bottom end of the seat lifting sleeve (5), and the upper end of the fixed tube (7) is inserted in the first guide sleeve (6); a second guide sleeve (4) is inserted and assembled in the bottom end of the backrest lifting sleeve (3), and the upper end of the seat lifting sleeve (5) is inserted in the second guide sleeve (4); the second screw rod (13) is hollow inside and axially penetrates the backrest lifting sleeve (3). and is assembled in the chair back lifting sleeve (3) through a bearing; the upper end of the second screw rod (13) is connected to the second rotating handle (2), and the lower end is threadedly connected to the upper end of the seat lifting sleeve (5); the first screw rod (14) passes through the central cavity (13B) of the second screw rod (13) and the seat lifting sleeve (5) in sequence, and is assembled in the seat lifting sleeve (5) through a bearing; the top end of the first screw rod (14) passes through the second rotating handle (2), is connected to the first rotating handle (1), and the lower end is threadedly connected to the upper end of the fixed tube (7), and the first rotating handle (1) is located above the second rotating handle (2); the first rotating handle (1) includes a rotating handle and a mounting seat, the center of the mounting seat is provided with a first polygonal plug hole (1A), and the lower part of the first polygonal plug hole (1A) is symmetrically provided with L-shaped pins (1B) The top end of the first screw rod (14) is provided with a polygonal column (14C) matching the first polygonal plug hole (1A), and the column (14C) is inserted into the first polygonal plug hole (1A); The second rotating handle (2) is a wheel-shaped structure, comprising a rotating wheel (2A), a columnar seat (2B) located at the center of the rotating wheel (2A), and a plurality of short rods (2C) connected between the rotating wheel (2A) and the columnar seat (2B); the top of the columnar seat (2B) is provided with a long strip socket (2E) matching the L-shaped pin (1B), and the bottom is provided with a second polygonal socket (2D); the top of the second screw rod (13) is provided with a polygonal plug (13A) matching the second polygonal socket (2D), and the plug (13A) is plugged into the second polygonal hole (2D).

2. The seat back lifting mechanism according to claim 1, characterized in that: The first screw rod (14) comprises a threaded section (14A), a smooth cylindrical section (14B), a polygonal column (14C) and a cylindrical short column (14D); wherein the threaded section (14A) is threadedly connected to a first nut (15) fixed in the top opening of the fixed tube (7); the cylindrical section (14B) is provided with two upper and lower grooves at the position where it is connected to the bearing in the seat lifting sleeve (5), and the two grooves are respectively equipped with a retaining ring; a spring (9) is provided between the top end of the short column (14D) and the mounting seat.

3. The seat back lifting mechanism according to claim 2, characterized in that: The portion where the second screw rod (13) is connected to the bearing (11) in the seat back lifting sleeve (3) is provided with two upper and lower grooves, and the two grooves are respectively equipped with a snap ring (10); the lower end of the second screw rod (13) is threadedly connected to the second nut (12) fixed in the top opening of the seat lifting sleeve (5).

4. A study chair, comprising a chair leg assembly (16), a chair seat assembly (17) and a chair back assembly (18), characterized in that: It also includes the seat back lifting mechanism as described in claim 1; the bottom end of the fixing tube (7) is fixedly assembled in the central recessed hole of the chair leg assembly (16); a transverse connecting arm (8) is fixed on the lower end outer wall of the seat lifting sleeve (5); the seat assembly (17) is fixedly assembled on the transverse connecting arm (8); a connecting ring (19) is fixed on the back of the seat back assembly (18), and the connecting ring (19) is sleeved on the seat back lifting sleeve (3) and is locked and fixed by fastening bolts (20).

Images