Patent Application
20240349896
This invention belongs to the technical field of folding chairs, and specifically relates to a double butterfly chair.
The butterfly chair is a specific style of folding chair that simulates the shape of butterfly wings based on the different designs of the seat and backrest cover, catering to different aesthetic needs. For example, CN02270597.X discloses a butterfly-shaped chair frame made up of multiple pipe joints that are hinged together. It includes a first backrest, a second backrest, a first seat, and a second seat. The pipe structures are consistent, with both ends pressed into curved shapes to increase the bending resistance of the pipes. Adjacent pipe joints are connected through the flat object, and the two pipe joints in the same facade are hinged in the middle to form a complete support structure. This patent uses rivets to connect adjacent surfaces without the need for additional bridging components.
CN201220331922.7 discloses a folding chair consisting of a pair of butterfly frames and a cover. Each butterfly frame has one long wing and one short wing, and the two butterfly frames are intersected and combined. Two long wings and two short wings correspond to each other on each side. The adjacent edges of the two long wings and the two short wings are intersected, and the two sides of each cross are connected by a connecting ring. The butterfly frame is composed of four pipes and connecting pieces connected in sequence. The root connection of the butterfly frame is equipped with a supporting foot, and the cover is respectively attached to the tips of the two long wings and two short wings. This patent uses connecting rings to form rivets between adjacent surfaces, eliminating the need for machining at the ends of the pipes.
In summary, folding chair frames have four facades, front, back, left, and right, each consisting of two crossed hinged rods. The end of the adjacent facade's rod is hinged or connected through a bridging component to form the overall chair frame, and the four corners of the cover are hung on a shelf that is low in the front and high in the back, forming a combined seat and backrest structure.
The object of this invention is to provide a solution for double use based on a single butterfly chair.
The purpose of the invention is to design a double butterfly chair with front and rear support frames composed of two sets of crossed hinge rods. The technical solution of the invention is realized as follows:
The double butterfly chair includes a seat cover and a chair frame. The chair frame has four sides, including left and right side frames corresponding to or symmetrical with each other, a front support frame, and a rear support frame. The front support frame is lower than the rear support frame and is linked by the two side frames to form a foldable and openable whole. The seat cover is suspended on the upper edges of the front and rear support frames. The invention is characterized in that both the front and rear support frames have two sets of crossed hinge rods. Between the hinged ends of the two sets of rods in the front and rear support frames, there is a middle support frame. A side support frame composed of the middle support frame and a set of crossed hinge rods is linked to the front and rear support frames together.
The middle support frame includes an upper rod, a middle rod, and a lower rod. The two ends of the middle rod are hinged correspondingly to the upper hinge point in the middle of the front support frame and the lower hinge point in the middle of the rear support frame. One end of the upper rod is hinged to the upper hinge point in the middle of the rear support frame, and the other end is hinged to the middle of the middle rod. The upper part of the lower rod is hinged with a sliding sleeve, which is mounted on the middle rod, and the lower end of the lower rod is hinged with a hinge component, which is hinged with the corresponding rod end of the two sets of rods in the front support frame through the hinge component.
The hinge assembly includes a hinge pin and two corresponding hinge arms, with the end portions of the two hinge arms hinged to the end portions of two rods in the front bracket. The lower end of the lower rod is hinged to the hinge pin through a connecting piece.
The middle rod has upper and lower limit points above the hinging point of the upper rod, which constrain the sliding distance of a sliding sleeve. When the chair frame is opened, the sleeve contacts the upper limit point, and during folding, the lower limit point drives the lower rod to pull the two hinge arms of the hinge assembly together.
The axial ends of the two hinge arms in the hinge assembly have enlarged outer round heads, which, when the hinge assembly is opened, support the outer round heads and the end portions of the hinge arms to form a three-point support.
The middle bracket includes an upper rod, a middle rod, and two lower rods. The two ends of the middle rod are hinged correspondingly to the upper hinge point in the front bracket and the lower hinge point in the rear bracket. One end of the upper rod is hinged to the upper hinge point in the rear bracket, and the other end is hinged to the middle of the middle rod. The upper ends of the two lower rods are hinged with a sliding sleeve that is fitted on the middle rod, and the lower ends of the two lower rods are hinged to corresponding rod end portions of the two rod sets in the front bracket.
The two lower rods of the middle bracket are hinged at both ends to the corresponding rod ends of the sliding sleeve and the front bracket through universal joints or sphere joints.
The middle rod of the hinge assembly is equipped with an upper limit point and a lower limit point above the hinge point of the upper rod. By restricting the sliding distance of the sliding sleeve with the upper and lower limit points, when the chair frame is fully open, the sliding sleeve comes into contact with the upper limit point, and during the folding process, the lower limit point drives the lower rod and pulls the two hinge arms of the hinge assembly together.
The seat and backrest covers are sewn with corresponding open fabric bags at the six upper hinge points in the front and rear brackets, which are directly placed on the six upper hinge points using the open fabric bags.
The present invention has the characteristics of unique design, ingenious structure, good correlation, smooth folding and unfolding, and stable support. Especially between the two sets of brackets in the front and back elevations, a middle bracket is used to form an organic connection and strengthen the support in the middle. The middle part of the seat cover is also suspended and supported by the upper edge of the middle bracket, dividing it into two seating spaces and forming independent support. Whether a single person or two people sit, the overall integrity of the structure is not affected.
Similar reference characters denote corresponding features consistently throughout the attached drawings. Namely, in the drawings the following reference numbers refer to the following part:
Referring to
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.
As shown in
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.
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.
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.
Referring to
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.
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.
