DOUBLE BUTTERFLY CHAIR

Abstract

A double butterfly chair comprises a seat cover and a chair frame, wherein the chair frame includes a front support, a rear support, and a side support that connects the front and rear supports. The seat cover is suspended on the upper edges of the front and rear supports. Specifically, the front and rear supports each have two sets of intersecting hinged rods, and a middle support is connected between the hinged rod ends of the two sets of rods in the front and rear supports. The middle support and the side support together connect the front and rear supports, and ingeniously divide the chair into two seating areas.

Claims

1. The invention relates to a double butterfly chair, comprising a seat and backrest cover (100) and a chair frame (200). The chair frame (200) has four facades, including the left and right facades corresponding to or symmetrical with the side brackets (1), the front facade's front bracket (2), and the rear facade's rear bracket (3). The front bracket (2) is lower than the rear bracket (3) and is connected by the two side brackets (1) to form a foldable and openable whole. The seat and backrest cover (100) are suspended on the upper edge of the front bracket (2) and the rear bracket (3). The front bracket (2) and the rear bracket (3) both have two groups of crossed hinged rods (201). A middle bracket (4) is connected between the hinged rod (201) at the end of the two groups of the brackets in the front and rear supports. A side bracket (1) is composed of the middle bracket (4) and a group of crossed hinged rods (201), which is used to connect the front bracket (2) and the rear bracket (3) together.

2. A double butterfly chair as claimed in claim 1, characterized in that: the middle support (4) includes an upper rod (41), a middle rod (42) and a lower rod (43), the two ends of the middle rod (42) are hinged correspondingly at the upper hinge point (2A) in the middle of the front support and the lower hinge point (3B) in the middle of the rear support; one end of the upper rod (41) is hinged at the upper hinge point (3A) in the middle of the rear support, and the other end is hinged in the middle of the middle rod (42); the upper end of the lower rod (43) is hinged with a sliding sleeve (44), which is mounted on the middle rod (42), and the lower end of the lower rod (43) is hinged with a hinge assembly (45), which is then hinged with the corresponding rod (201) end of the two groups of rods in the front support (2) by means of the hinge assembly (45).

3. A double butterfly chair according to claim 2, characterized in that: the middle rod (42) is provided with an upper limit point (421) and a lower limit point (422) above the hinge point where it is hinged to the upper rod (41), and the sliding distance of the slide sleeve (44) is constrained by the upper limit point (421) and the lower limit point (422), and when the chair frame (200) is fully opened, the slide sleeve (44) abuts against the upper limit point (421), and during the folding process, the lower limit point (422) drives the lower rod (43) and pulls together the two arms (452) of the hinge component.

4. A double butterfly chair according to claim 2, characterized in that: the hinge assembly (45) comprises a hinge shaft (451) and two corresponding hinge arms (452), and the two ends of the hinge arms (452) are hinged with the two ends of the two members in the front frame (2); and the lower end of the lower member (43) is hinged on the hinge shaft (451) through a connecting piece (5).

5. A double butterfly chair according to claim 4, characterized in that the shaft ends of the two hinge arms (452) in the hinge component have enlarged outer heads (453), and when the hinge component (45) is fully opened, the outer heads (453) and the ends of the hinge arms (452) form a three-point support.

6. A double butterfly chair according to claim 1, characterized in that: the middle support (4) comprises an upper rod (41), a middle rod (42), and two lower rods (43), the two ends of the middle rod (42) are hinged correspondingly at the upper hinge point (2A) in the middle of the front support and the lower hinge point (3B) in the middle of the rear support; one end of the upper rod (41) is hinged at the upper hinge point (3A) in the middle of the rear support, and the other end is hinged at the middle of the middle rod (42); the upper end of the two lower rods (43) is hinged with a slide sleeve (44), which is mounted on the middle rod (42), and the lower end of the two lower rods (43) is hinged with the corresponding rod end of the two groups of rods (201) in the front support (2).

7. According to claim 6, a double butterfly chair is characterized in that: both ends of the two lower rod components (43) in the middle bracket are hinged with the end portions of the two rod components (201) of the front bracket through a universal joint or a sphere joint (6) and the sliding sleeve (44).

8. A double butterfly chair according to claim 6, characterized in that: the middle support (4) includes an upper rod (41), a middle rod (42), and two lower rods (43). The middle rod (42) is hinged at its two ends to the upper hinge point (2A) in the middle of the front support and the lower hinge point (3B) in the middle of the rear support. One end of the upper rod (41) is hinged to the upper hinge point (3A) in the middle of the rear support, and the other end is hinged to the middle of the middle rod (42). The upper ends of the two lower rods (43) are hinged with a sliding sleeve (44), which is slidably mounted on the middle rod (42), and the lower ends of the two lower rods (43) are hinged to the corresponding ends of the two groups of rods (201) in the front support. The two ends of the two lower rods (43) in the middle support are hinged to the corresponding ends of the two rods (201) in the front support through universal joints or sphere joints (6) and the sliding sleeve (44). The middle rod (42) is provided with an upper limit point (421) and a lower limit point (422) above the hinge point where it is hinged to the upper rod (41), and the sliding distance of the sliding sleeve (44) is restricted by the upper limit point (421) and the lower limit point (422). When the chair frame (200) is fully opened, the sliding sleeve (44) abuts against the upper limit point (421), and during the folding process, the lower limit point (422) drives the lower rod (43) and the two hinge arms (452) in the hinge assembly (45) to retract.

9. A double butterfly chair according to claim 1, characterized in that: the seat and back fabric cover (100) has a corresponding open fabric pocket (101) sewn at each of the six upper hinge points on the front frame (2) and rear frame (3), and is directly placed on the six upper hinge points with the aid of the open fabric pockets (101).

Description

BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 shows a schematic diagram of the double butterfly chair.

[0018] FIG. 2 shows a schematic diagram of the double butterfly chair frame in the open state.

[0019] FIG. 3 shows a schematic diagram of the double butterfly chair frame in the folded state.

[0020] FIG. 4 shows a schematic diagram of the front and middle frames in the open state.

[0021] FIG. 5 shows a schematic diagram of the front and middle frames in the folded state.

[0022] FIG. 6 shows a schematic diagram of the second view of the double butterfly chair frame.

[0023] FIG. 7 shows a schematic diagram of the front and middle frames in the open state in FIG. 6.

[0024] FIG. 8 shows a schematic diagram of the front and middle frames in the folded state in FIG. 6.

[0025] Similar reference characters denote corresponding features consistently throughout the attached drawings. Namely, in the drawings the following reference numbers refer to the following part: [0026] 100Seat cover [0027] 101Open pocket [0028] 200Chair frame [0029] 201Rod component [0030] 1Side bracket [0031] 2Front bracket [0032] 2AUpper hinge point in the middle of the front bracket [0033] 3Rear bracket [0034] 3AUpper hinge point in the middle of the rear bracket [0035] 3BLower hinge point in the middle of the rear bracket [0036] 4Middle bracket [0037] 41Upper rod component [0038] 42Middle rod component [0039] 421Upper limit point [0040] 422Lower limit point [0041] 43Lower rod component [0042] 44Sliding sleeve [0043] 45Hinge assembly [0044] 451Hinge pin [0045] 452Hinge arm [0046] 453Outer round head [0047] 5Adapter piece [0048] 6sphere joint

DETAILED DESCRIPTION

[0049] Referring to FIGS. 1 to 5, the double butterfly chair consists of two parts: the seat and backrest cover 100 and the chair frame 200. The chair frame 200 has four facades, including the left and right facades with corresponding or symmetrical side supports 1, the front facade with the lower front support 2, and the rear facade with the higher rear support 3. The front support 2 is lower than the rear support 3, forming a lower seat and higher backrest, and is linked by two side supports 1 to form a foldable and openable whole. Specifically, each facade includes a set of two intersecting hinged rods 201, forming a foldable and unfoldable chair frame. The seat and backrest cover 100 hangs on the upper edge of the front support 2 and the rear support 3, forming a suspended structure for the seat and backrest, which is also the basic design of the existing butterfly chair and suitable for single use.

[0050] The front support 2 and rear support 3 in the present invention both have two sets of cross-hinged rods 201. Between the hinged ends of the two sets of rods 201 in the front and rear supports, there is a middle support 4. The side support 1, which is composed of the middle support 4 and a set of cross-hinged rods 201, is used to link the front support 2 and the rear support 3, forming two relatively independent spaces on the left and right sides that are connected and allow for independent support. This design ensures smooth operation when the chair is opened and closed. The middle support 4 has two specific structural examples, which are shown below.

Embodiment 1

[0051] As shown in FIGS. 2 to 5, the middle support 4 includes an upper rod 41, a middle rod 42, and a lower rod 43. Both ends of the middle rod 42 are hinged to the upper hinge point 2A in the middle of the front support and the lower hinge point 3B in the middle of the rear support. One end of the upper rod 41 is hinged to the upper hinge point 3A in the middle of the rear support, and the other end is hinged to the middle of the middle rod 42. The upper part of the lower rod 43 is hinged with a sliding sleeve 44, which is mounted on the middle rod 42. The lower part of the lower rod 43 is hinged with a hinge assembly 45, which is further hinged with the corresponding end of the two rods 201 in the two sets of rods of the front support 2, enabling both sets of crossed hinged rods 201 in the front support 2 to be linked and constrained.

[0052] Furthermore, the hinge assembly 45 includes a hinge shaft 451 and two corresponding hinge arms 452. The two ends of the hinge arms 452 are hinged with the two ends of the two rods in the front support 2. The lower part of the lower rod 43 is hinged with the hinge shaft 451 through a transfer piece 5. Specifically, the axial end of the hinge arm 452 has an enlarged outer round head 453, and when the hinge assembly 45 is fully opened, the outer round head 453 and the end of the hinge arm 452 form a three-point support, which can directly transfer the forces of the two rods 201 and the lower rod 43 to the ground. In addition, the hinging of the rods in the middle support 4 with the upper and lower hinge points on the front and rear supports all need to be completed with the help of the transfer piece 5, which provides the freedom of two perpendicular axes for unfolding and folding operations. The two hinge arms 452 of the hinge assembly 45 mentioned above can be assembled in reverse as part of the same component, which only requires one mold to complete.

[0053] Furthermore, the middle rod 42 is equipped with an upper limit point 421 and a lower limit point 422 above the joint point with the upper rod 41. By using the upper limit point 421 and lower limit point 422 to constrain the sliding distance of the sliding sleeve 44, when the chair frame 200 is fully open, the sliding sleeve 44 will come into contact with the upper limit point 421 and transfer the weight to the lower rod 43. During the folding process, the lower limit point 422 will drive the lower rod 43 and pull the two arms 452 of the hinge component to retract.

[0054] The seat and back cover 100 correspond to the six upper joint points in the front frame 2 and rear frame 3, and each has a corresponding open pocket 101 sewn onto it. The dashed lines in the figure show that the open pockets 101 are directly placed on the six upper joint points to form two independent seating areas.

Embodiment 2

[0055] Referring to FIGS. 6, 7, and 8, the middle bracket 4 including an upper rod 41, a middle rod 42, and two lower rods 43, which have a similar structure to the previous example, except that two lower rods 43 are used instead of the hinge assembly 45 to form an equivalent expandable and collapsible structure. Specifically:

[0056] The two ends of the middle rod 42 are respectively hinged at the upper hinge point 2A in the middle of the front bracket and the lower hinge point 3B in the middle of the rear bracket; one end of the upper rod 41 is hinged at the upper hinge point 3A in the middle of the rear bracket, and the other end is hinged at the middle of the middle rod 42; the upper ends of the two lower rods 43 are hinged to a sliding sleeve 44, which is mounted on the middle rod 42, and the lower ends of the two lower rods 43 are hinged to the corresponding ends of the two rods 201 of the front bracket.

[0057] Specifically, the two ends of the two lower rods 43 in the middle bracket 4 are hinged to the corresponding ends of the two rods 201 of the front bracket through universal joints or sphere joints 6 and the sliding sleeve 44, which can meet the angle changes during expansion and contraction. The other structures and the method of use are the same as in the previous example.