Foldable connecting structure for backrest framework and seat plate framework of chair

Abstract

The utility model relates to a foldable connecting structure for a backrest framework and a seat plate framework of a chair, which is characterized in that the backrest framework and the seat plate framework of the chair are connected in a rotatable hinging manner, so that the backrest framework of the chair can be propped against the seat plate framework when articles are transported, the product volume is compressed, the packaging volume is reduced, and the loading capacity of a packaging box is improved; when the backrest needs to be unfolded, only the backrest framework needs to be lifted upwards, the backrest framework can be easily fixed to the position where the backrest framework and the rear vertical pipe are kept at the same straight line angle under the action of the upper limiting step on the pivoting piece and the lower limiting step on the fixing piece, installation and unfolding are completed, operation is easy and convenient, redundant installation steps are not needed, and time and labor are saved, and simpleness and rapidness are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chairs, in particular to a foldable connection structure of a backrest frame and a seat frame of a chair. Background Art

[0002] A common type of lift-type swivel chair on the market has a structure consisting of lift legs, a seat cushion, a backrest and armrests, wherein the seat cushion, backrest and armrests adopt a skeleton structure inside and are covered with soft material outside, the backrest frame and the seat cushion frame are fixedly connected, and the armrest frame is fixedly connected to the seat cushion frame. The disadvantage of this type of chair with a fixed connection structure is that since the backrest frame is fixedly connected to the seat cushion frame, a larger box is required to pack a single chair, which takes up more transportation space. Therefore, in the prior art, the backrest frame and seat cushion frame of the swivel chair are disassembled and transported separately, and the purchaser is required to install and connect them by himself, but the installation operation is relatively complicated, time-consuming and labor-intensive, and is prone to installation errors. Utility Model Content

[0003] The purpose of the present invention is to address the above-mentioned problems and shortcomings and to provide a foldable connection structure for a chair backrest frame and a seat frame, which reduces packaging volume, lowers transportation costs, increases the loading capacity of packaging boxes, is convenient for disassembly and assembly, and saves time and effort.

[0004] The technical solution adopted by the present invention is: a foldable connection structure of a chair's backrest frame and seat plate frame, including a backrest and a seat plate, the backrest including a backrest frame and a backrest covering body, the seat plate including a seat plate frame and a seat plate covering body, the backrest frame and the seat plate frame are rotatably hingedly connected, the rear part of the seat plate frame is provided with a rear vertical tube, a movable pivot device is provided between the rear vertical tube and the backrest frame, the movable pivot device includes a fixing part arranged at the upper end of the rear vertical tube, a pivot part arranged at the lower part of both sides of the backrest frame and cooperating with the fixing part, and a pivot shaft connecting the fixing part and the pivot part, the fixing part includes two pivot plates parallel to each other arranged at the upper part and a lower limit step connecting the two pivot plates, the pivot part is provided with an upper limit step, and the fixing part and the pivot part are provided with through holes adapted to the pivot shaft. When the chair is folded, the backrest frame of the chair rests on the seat frame. When unfolded for installation, the backrest frame is pulled upward. Under the action of the limiting step on the pivoting member and the limiting plate on the fixing member, the pivoting member rotates around the pivot axis and is fixed in a direction that is in a straight line with the fixing member to complete the seat installation. The operation is simple, saving time and effort.

[0005] Furthermore, the rear vertical pipe is a sleeve, and the fixing piece is tightly inserted into the rear vertical pipe.

[0006] As another solution, the rear vertical pipe is a sleeve, and the fixing piece is inserted into the rear vertical pipe and then fixed by welding.

[0007] Furthermore, the backrest frame includes an upper backrest arc rod, a lower backrest arc rod, a backrest side vertical rod, a backrest middle vertical rod connecting the upper backrest arc rod and the lower backrest arc rod, and a backrest middle cross rod connecting the left and right backrest side vertical rods, and the horizontal height of the backrest lower arc rod is higher than the pivot part.

[0008] Furthermore, the seat plate frame includes a cushion frame, an armrest frame and a waist and hip frame, and the armrest frame includes a front riser, a rear riser, an upper crossbar connecting the front riser and the rear riser, and a side guard bar connecting the upper crossbar and the seat cushion frame.

[0009] Furthermore, the seat cushion frame includes a seat cushion frame front rod, a seat cushion frame rear rod and a seat cushion frame side rod which form a frame;

[0010] The waist and hip frame includes an upper arc rod, a lower arc rod, a first vertical rod and a second vertical rod connecting the upper arc rod and the lower arc rod, and a first cross rod connecting the left and right rear vertical tubes. The upper arc rod is equal to the height of the rear vertical tube. The lower ends of the first vertical rods on the left and right sides are respectively connected to the side rods of the seat cushion frame. The armrest frame is connected to the waist and hip frame through the left and right rear vertical tubes.

[0011] Preferably, the backrest side uprights and the pivot members are fixedly connected by steel pipe welding, the backrest upper arc rod, the backrest lower arc rod and the backrest side uprights are made of steel pipes and connected by welding, the backrest center upright and the backrest center cross rod are made of flat steel bars, and the backrest center uprights are provided with three backrest center uprights, which are respectively connected to the backrest upper arc rod and the backrest lower arc rod by welding; the backrest center cross rod is connected to the backrest side uprights by welding.

[0012] Preferably, the front vertical tube, the rear vertical tube and the upper cross bar are made of steel pipes bent in one piece, and there are two side guard bars on each side of the armrest frame. The side guard bars are made of flat steel bars, and the upper and lower ends of the side guard bars are respectively connected to the upper cross bar and the seat cushion frame by welding.

[0013] Preferably, the front rod of the seat frame and the front vertical tubes, rear vertical tubes and upper cross bars on the left and right sides of the armrest frame are made of steel pipes bent in one piece, the side rods of the seat frame and the first vertical rod are made of steel pipes bent in one piece, and the side rods of the seat frame are respectively connected to the front rod of the seat frame, the rear rod of the seat frame, the lower arc rod and the upper arc rod by welding;

[0014] The first vertical pole, the second vertical pole and the first cross bar are each provided with two, the second vertical pole is made of steel pipe, and the second vertical pole is respectively connected to the upper arc bar and the lower arc bar by welding; the first cross bar is made of steel wire.

[0015] The beneficial effects of the present invention are as follows: the chair back frame and the seat frame are connected in a rotatable hinged manner, so that when transporting items, the chair back frame can be placed against the seat frame, compressing the product volume, reducing the packaging volume, and increasing the loading capacity of the packaging box; when it needs to be unfolded, it is only necessary to pull the back frame upwards, and due to the upper limit step on the pivot part and the lower limit step on the fixing part, the back frame can be easily fixed in a position that maintains the same straight line angle with the rear vertical pipe, completing the installation and unfolding, which is easy and simple to operate, does not require unnecessary installation steps, saves time and effort, and is simple and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a chair frame according to an embodiment of the present invention;

[0017] Figure 2 This utility model Figure 1 Schematic diagram of the chair's structure after folding;

[0018] Figure 3 This utility model Figure 2 A partial enlarged view of

[0019] Figure 4 It is a schematic diagram of the utility model covered with a coating body. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1: Figure 1-4 As shown, the utility model provides a foldable connection structure of a backrest frame and a seat plate frame of a chair, including a backrest and a seat plate, the backrest including a backrest frame and a backrest covering, the seat plate including a seat plate frame and a seat plate covering, the backrest frame and the seat plate frame are rotatably hingedly connected, a rear vertical tube 1 is provided at the rear of the seat plate frame, a movable pivot device is provided between the rear vertical tube 1 and the backrest frame, the movable pivot device includes a fixing member 10 arranged at the upper end of the rear vertical tube 1, a pivot member 20 arranged at the lower part of both sides of the backrest frame and cooperating with the fixing member 10, and a pivot shaft 11 connecting the fixing member 10 and the pivot member 20, the fixing member 10 includes two pivot plates 12 arranged at the upper part and parallel to each other and a lower limit step 13 connecting the two pivot plates 12, an upper limit step 14 is provided on the pivot member 20, and a through hole adapted to the pivot shaft 11 is provided on the fixing member 10 and the pivot member 20. When the chair is folded, the backrest frame of the chair rests on the seat frame. When unfolded for installation, the backrest frame is pulled upward. Under the action of the limiting step on the pivoting member and the limiting plate on the fixing member, the pivoting member rotates around the pivot axis and is fixed in a direction that is in a straight line with the fixing member to complete the seat installation. The operation is simple, saving time and effort.

[0022] In this embodiment, the rear vertical tube 1 is a sleeve, and the fixing member 10 is inserted into the rear vertical tube 1 and fixed to the rear vertical tube 1 by welding. The backrest frame includes an upper backrest arc rod 21, a lower backrest arc rod 22, a backrest side rod 23, a backrest center rod 24 connecting the upper backrest arc rod 21 and the lower backrest arc rod 22, and a backrest center crossbar 25 connecting the left and right backrest side rods 23. The lower backrest arc rod 22 is higher than the pivot member 20.

[0023] In this embodiment, the seat frame includes a seat frame, an armrest frame, and a waist and hip frame. The armrest frame includes a front riser 31, a rear riser 1, an upper crossbar 32 connecting the front riser 31 and the rear riser 1, and a side guard bar 33 connecting the upper crossbar 32 and the seat frame. The seat frame includes a front seat frame bar 41, a rear seat frame bar 42, and side seat frame bars 43 that form a frame.

[0024] The waist and hip frame includes an upper arc rod 51, a lower arc rod 52, a first vertical rod 53 and a second vertical rod 54 connecting the upper arc rod 51 and the lower arc rod 52, and a first cross rod 55 connecting the left and right rear vertical tubes 1. The upper arc rod 51 is equal to the height of the rear vertical tube 1. The lower ends of the first vertical rods 53 on the left and right sides are respectively connected to the side rods 43 of the seat cushion frame. The armrest frame is connected to the waist and hip frame through the left and right rear vertical tubes 1.

[0025] In this embodiment, the backrest side uprights 23 are fixedly connected to the pivot member 20 by steel pipe welding. The backrest upper arc rod 21, the backrest lower arc rod 22 and the backrest side uprights 23 are made of steel pipes and are connected by welding. The backrest center uprights 24 and the backrest center cross rod 25 are made of flat steel bars. There are three backrest center uprights 24. The backrest center uprights 24 are respectively connected to the backrest upper arc rod 21 and the backrest lower arc rod 22 by welding; the backrest center cross rod 25 is connected to the backrest side uprights 23 by welding.

[0026] In this embodiment, the front vertical tube 31, the rear vertical tube 1 and the upper cross bar 32 are made of steel pipes bent in one piece. There are two side guard bars 33 on each side of the armrest frame. The side guard bars 33 are made of flat steel bars. The upper and lower ends of the side guard bars 33 are respectively connected to the upper cross bar 32 and the seat cushion frame by welding.

[0027] In this embodiment, the front rod 41 of the seat frame and the front vertical tubes 31, rear vertical tubes 1 and upper crossbars 32 on the left and right sides of the armrest frame are made of steel pipes bent in one piece. The side rods 43 of the seat frame and the first vertical rods 53 are made of steel pipes bent in one piece. The side rods 43 of the seat frame are respectively connected to the front rod 41 of the seat frame, the rear rod 42 of the seat frame, the lower arc rod 52 and the upper arc rod 51 by welding.

[0028] There are two first vertical rods 53, two second vertical rods 54 and two first cross rods 55. The second vertical rods 54 are made of steel pipes and are connected to the upper arc rod 51 and the lower arc rod 52 by welding. The first cross rod 55 is made of steel wire.

[0029] In other embodiments, based on the above-mentioned embodiment 1, the fixing member 10 can be fixedly connected to the rear standpipe 1 by means of tight plugging, bolt fixing, or integral mold production.

[0030] The above embodiment is only one embodiment of the present invention and does not constitute a limitation. Any simple modification, change, substitution, combination, or simplification made without departing from the spirit of the present invention is equivalent to an equivalent replacement method and should be within the scope of protection of the present invention.

Claims

1. A foldable connection structure for a chair backrest frame and a seat frame, comprising a backrest and a seat, wherein the backrest comprises a backrest frame and a backrest covering, and the seat comprises a seat frame and a seat covering, characterized in that: The backrest frame and the seat plate frame are rotatably hingedly connected, a rear vertical tube (1) is provided at the rear of the seat plate frame, and a movable pivot device is provided between the rear vertical tube (1) and the backrest frame, and the movable pivot device includes a fixing member (10) provided at the upper end of the rear vertical tube (1), a pivot member (20) provided at the lower part of both sides of the backrest frame and matched with the fixing member (10), and a pivot shaft (11) connecting the fixing member (10) and the pivot member (20), the fixing member (10) includes two mutually parallel pivot plates (12) provided at the upper part and a lower limit step (13) connecting the two pivot plates (12), an upper limit step (14) is provided on the pivot member (20), and a through hole adapted to the pivot shaft (11) is provided on the fixing member (10) and the pivot member (20).

2. The foldable connection structure of the chair backrest frame and the seat frame according to claim 1, characterized in that: The rear vertical pipe (1) is a sleeve, and the fixing piece (10) is tightly inserted into the rear vertical pipe (1).

3. The foldable connection structure of the chair backrest frame and seat frame according to claim 1, characterized in that: The rear vertical pipe (1) is a sleeve, and the fixing piece (10) is inserted into the rear vertical pipe (1) and then fixed by welding.

4. The foldable connection structure of the chair backrest frame and seat frame according to claim 1, characterized in that: The backrest frame comprises an upper backrest arc rod (21), a lower backrest arc rod (22), a backrest side rod (23) which form a frame, a backrest middle rod (24) connecting the upper backrest arc rod (21) and the lower backrest arc rod (22), and a backrest middle cross rod (25) connecting the left and right backrest side rods (23), wherein the lower backrest arc rod (22) is higher in level than the pivot member (20).

5. The foldable connection structure of the chair backrest frame and seat frame according to claim 1, characterized in that: The seat plate frame comprises a seat cushion frame, an armrest frame and a waist and hip frame, and the armrest frame comprises a front riser (31), a rear riser (1), an upper crossbar (32) connecting the front riser (31) and the rear riser (1), and a side guard bar (33) connecting the upper crossbar (32) and the seat cushion frame.

6. The foldable connection structure of the chair backrest frame and seat frame according to claim 5, characterized in that: The seat cushion frame comprises a seat cushion frame front rod (41), a seat cushion frame rear rod (42) and a seat cushion frame side rod (43) which form a frame; The waist-hip frame comprises an upper arc rod (51), a lower arc rod (52), a first vertical rod (53) and a second vertical rod (54) connecting the upper arc rod (51) and the lower arc rod (52), and a first cross rod (55) connecting the rear vertical tubes (1) on the left and right sides. The upper arc rod (51) and the rear vertical tube (1) are of equal height. The lower ends of the first vertical rods (53) on the left and right sides are respectively connected to the side rods (43) of the seat cushion frame. The armrest frame is connected to the waist-hip frame via the rear vertical tubes (1) on the left and right sides.

7. The foldable connection structure of the chair backrest frame and seat frame according to claim 4, characterized in that: The backrest side upright rods (23) are fixedly connected to the pivot member (20) by steel pipe welding. The backrest upper arc rod (21), the backrest lower arc rod (22), and the backrest side upright rods (23) are made of steel pipes and connected by welding. The backrest center upright rod (24) and the backrest center cross rod (25) are made of flat steel bars. The backrest center upright rods (24) are provided with three, and the backrest center upright rods (24) are respectively connected to the backrest upper arc rod (21) and the backrest lower arc rod (22) by welding; the backrest center cross rod (25) is connected to the backrest side upright rods (23) by welding.

8. The foldable connection structure of the chair backrest frame and seat frame according to claim 5, characterized in that: The front vertical tube (31), the rear vertical tube (1) and the upper crossbar (32) are made of steel pipes bent in one piece. Two side guard bars (33) are respectively provided on the left and right sides of the armrest frame. The side guard bars (33) are made of flat steel bars. The upper and lower ends of the side guard bars (33) are respectively connected to the upper crossbar (32) and the seat frame by welding.

9. The foldable connection structure of the chair backrest frame and seat frame according to claim 6, characterized in that: The front rod (41) of the seat frame and the front vertical tubes (31), the rear vertical tubes (1) and the upper crossbar (32) on the left and right sides of the armrest frame are made of steel pipes that are bent in one piece. The side rods (43) of the seat frame and the first vertical rod (53) are made of steel pipes that are bent in one piece. The side rods (43) of the seat frame are respectively connected to the front rod (41) of the seat frame, the rear rod (42) of the seat frame, the lower arc rod (52) and the upper arc rod (51) by welding. The first vertical rod (53), the second vertical rod (54) and the first cross rod (55) are each provided with two, the second vertical rod (54) is made of a steel pipe, and the second vertical rod (54) is respectively connected to the upper arc rod (51) and the lower arc rod (52) by welding; the first cross rod (55) is made of a steel wire.

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