Butterfly hinge

Abstract

The utility model discloses a butterfly hinge, which comprises a first support, a second support and a third support. The second bracket is hinged with the first bracket and is provided with a pin shaft; the lever is rotatably installed on the second support through a pin shaft, one end of the lever is provided with a plurality of inclined first gear notches, the other end of the lever is connected with the second support through a spring, and under the elastic effect of the spring, the first gear notches can be buckled and positioned on the gear pin; the lever is further provided with an extending piece capable of relatively sliding in the length direction of the lever, the end of the extending piece extends out of one end of the lever, and the end of the extending piece is further provided with an extending groove matched with the gear pin and distributed in an inclined mode. The maximum angle of relative rotation of the second support and the first support is 180 degrees or close to 180 degrees, so that the purpose that the sofa backrest is folded on the upper end face of the sofa base or close to the upper end face of the sofa base can be achieved, the size of the whole sofa is further reduced, and the sofa is small in occupied space and convenient to package and transport.

Description

Technical Field

[0001] The utility model relates to the technical field of hinge products, in particular to a butterfly hinge capable of realizing large-angle rotation. Background Art

[0002] A hinge, also known as a hinge, is a mechanical device used to connect two solids and allow relative rotation between them. A hinge can be composed of movable components or foldable materials. It is mainly divided into stainless steel hinges and iron hinges according to the material classification. Nowadays, hinges have a wide range of applications. Among them, in the production and manufacturing process of sofas, sofa hinges are one of the important components used to assemble sofa parts.

[0003] The Chinese invention patent with the announcement number CN106235712B discloses a multi-stage sofa hinge for a convertible sofa, which provides easy conversion of the sofa from one position to another while providing additional safety by greatly reducing the risk of injuring the operator's fingers. The sofa hinge includes a first bracket and a second bracket rotatably connected to the sofa hinge at a bolt. The sofa hinge also includes a lever gear mechanism connected to the first bracket through a first lever handle on the first bracket. The lever gear mechanism is connected to the second bracket through a second lever handle on the second bracket. The first bracket has a cover plate on both the inner and outer surfaces of the bracket. The second bracket includes a cover plate attached to the outer surface. The second lever handle can be larger than the first lever handle and acts as an additional cover plate on the inner surface of the sofa hinge. By making the cover plate and the second lever handle cover the lever gear mechanism of the sofa hinge on both the outer and inner surfaces of the sofa hinge, the risk of injuring the operator's fingers is greatly reduced.

[0004] The sofa hinge has some disadvantages: in the above patent, since the length of the lever 105 in the sofa hinge is a specified length, when the maximum angle of relative rotation between the first bracket and the second bracket is 100 degrees, as shown in the attached figure of the patent, the sofa hinge has a length of 105, and the length of the lever 105 in the sofa hinge is a specified length. Figure 9-1 1, the outermost notch 114 of the lever 105 engages with the pin 113, thereby achieving the purpose of locking. At this time, the first bracket and the second bracket can no longer rotate relative to each other, so that the backrest fixedly connected to the first bracket cannot be folded relative to the sofa base frame fixedly connected to the first bracket, so that the packaging size of the entire sofa becomes very large, requiring a large space, which is not conducive to transportation.

[0005] In view of this, the inventor proposes the following technical solution. Utility Model Content

[0006] The utility model aims to overcome the deficiencies of the prior art and provide a butterfly hinge.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions: the butterfly hinge includes: a first bracket, which is provided with a gear pin; a second bracket hinged to the first bracket, which is provided with a pin shaft; a lever, which is rotatably mounted on the second bracket through the pin shaft, and one end of the lever is provided with a plurality of inclined first gear slots, the other end of the lever is connected to the second bracket through a spring, and under the elastic action of the spring, the first gear slot can be snap-locked and positioned on the gear pin; the lever is also provided with an extension piece that can slide relatively along its length direction, the end of the extension piece extends out of one end of the lever, and the end of the extension piece is also provided with an extension groove that is adapted to the gear pin and is obliquely distributed.

[0008] Furthermore, in the above technical solution, a sliding pin is provided in the lever, and a first strip-shaped slide groove is provided in the middle of the extension piece along its length direction, and the sliding pin is passed through the first strip-shaped slide groove, so that the extension piece can be slidably installed in the lever.

[0009] Furthermore, in the above technical solution, the lever is also provided with a blocking piece which can slide relatively along its length direction and can be used to block the first gear slot, the blocking piece has a second gear slot adapted to the first gear slot and a blocking portion located beside the second gear slot, when the blocking piece slides relative to the lever to the point where the second gear slot is misaligned with the first gear slot, the blocking portion is located beside the opening of the first gear slot, so that the first gear slot cannot be buckled with the gear pin.

[0010] Furthermore, in the above technical solution, a second strip slide groove is provided in the middle part of the baffle plate and is distributed along its length direction. The sliding pin is passed through the second strip slide groove, so that the baffle plate can be slidably installed in the lever, and the end of the baffle plate and the end of the extension plate are respectively provided with matching first positioning holes and second positioning holes. When the positioning member is passed through the first positioning hole and the second positioning hole, the baffle plate and the extension plate are fixed together, and the rear side of the first strip slide groove contacts the gear pin, and the front side of the second strip slide groove contacts the gear pin, so that the baffle plate and the extension plate are both fixed together with the lever, and at this time, the blocking portion is located beside the opening of the first gear slot.

[0011] Furthermore, in the above technical solution, an inclined edge is provided at the front end of the blocking piece, and the inclination angle of the inclined edge is the same as the inclination angle of the extension groove.

[0012] Furthermore, in the above technical solution, the first bracket is provided with a bent first limiting plate, a limiting space is formed between the first limiting plate and the first bracket, and the two ends of the gear pin are respectively fixedly connected to the first bracket and the first limiting plate, and the lever passes through the limiting space and can slide relatively.

[0013] Furthermore, in the above technical solution, an avoidance groove is also provided at the edge of the first limiting piece.

[0014] Furthermore, in the above technical solution, the inner side surface of the first limiting plate is provided with a first rib protruding inward for reducing the contact area, and the outer side surface of the first bracket is provided with a second rib protruding outward for reducing the contact area; the first rib and the second rib are distributed outside both sides of the lever, and the lever is in contact with at least one of the first rib and the second rib.

[0015] Furthermore, in the above technical solution, a hook hole is provided at the other end of the lever, and the first hook portion at one end of the spring is hooked and connected to the hook hole; the second bracket is also bent to form a hook rod, and the second hook portion at the other end of the spring is hooked and connected to the hook rod.

[0016] Furthermore, in the above technical solution, a hook groove is provided on the outer side of the hook rod, and the second hook portion is hooked in the hook groove.

[0017] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art: when the second bracket and the first bracket are rotated to the maximum angle, the end of one end of the lever completely leaves the gear pin, at this time, the extension groove at the end of the extension piece is hooked on the gear pin, and the extension piece can slide relative to the length direction of the lever, and extend as an extension arm of the lever, thereby preventing the structure formed by the combination of the lever and the extension piece from detaching from the gear pin, thereby expanding the relative rotation angle between the second bracket and the first bracket, the minimum angle formed between the second bracket and the first bracket is 0 degrees or close to 0 degrees, and the maximum angle formed between the second bracket and the first bracket is 180 degrees, that is, the maximum relative rotation angle between the second bracket and the first bracket is 180 degrees or close to 180 degrees, thereby meeting the purpose of folding the sofa backrest at the upper end surface of the sofa base or close to the upper end surface of the sofa base, thereby reducing the volume of the entire sofa, making the sofa occupy a small space, and facilitating packaging and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the first state of the utility model;

[0019] Figure 2 It is a stereogram of another viewing angle of the first state of the utility model;

[0020] Figure 3 It is a three-dimensional exploded view of the first state of the utility model;

[0021] Figure 4 It is a stereogram of the third viewing angle of the first state of the utility model;

[0022] Figure 5This is a state diagram of the extension piece and the blocking piece in the utility model being relatively positioned and assembled with the lever;

[0023] Figure 6 This is a state diagram of the extension piece and the blocking piece in the utility model being assembled with the lever when they are in a free state;

[0024] Figure 7 It is a three-dimensional diagram of the second state of the utility model;

[0025] Figure 8 It is a stereogram of another viewing angle of the second state of the utility model;

[0026] Fig. 9 It is a three-dimensional diagram of the third state of the utility model. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with specific embodiments and drawings.

[0028] See Figure 1-9 As shown, a butterfly hinge comprises: a first bracket 1, which is provided with a gear pin 11; a second bracket 2 hinged to the first bracket 1, which is provided with a pin shaft 21; a lever 3, which is rotatably mounted on the second bracket 2 through the pin shaft 21, and one end of the lever 3 is provided with a plurality of inclined first gear slots 31, and the other end of the lever 3 is connected to the second bracket 2 through a spring 4, and under the elastic action of the spring 4, the first gear slot 31 can be snap-locked and positioned on the gear pin 11.

[0029] When the utility model is in use, the first bracket 1 is fixed to the sofa base, and the sofa backrest is fixed to the second bracket 2, so that the backrest is installed on the sofa base in a rotatable and adjustable manner. At this time, after a first gear slot 31 of the lever 3 is buckled and positioned on the gear pin 11, the sofa backrest is no longer moved, that is, when the first bracket 1 and the second bracket 2 are no longer rotating, under the elastic action of the spring 4, the first gear slot 31 can be stably buckled and positioned on the gear pin 11, wherein the second bracket 2 and the first bracket 1 are relatively rotated to be parallel to each other, such as Fig. 9 As shown, the sofa backrest and the sofa base are on the same plane to form a sofa bed; the second bracket 2 and the first bracket 1 can also be rotated relative to each other until the angle between the two is close to 100 degrees, so that the sofa backrest is tilted and positioned on the sofa base to form a sofa. Figure 1-2As shown, when the angle of the backrest relative to the base needs to be adjusted, the first bracket 1 on the backrest is rotated relative to the second bracket 2 in a direction close to the base. At this time, the first bracket 1 pulls the lever 3 to move in a direction away from the second bracket 2. At this time, the first gear slot 31 is disengaged from the gear pin 11, and then the first bracket 1 on the backrest is rotated in a direction away from the base relative to the second bracket 2 until it is adjusted to a predetermined angle. Under the elastic action of the spring 4 of the other first gear slot 31, the buckle is stably positioned on the gear pin 11, so that the backrest is stably positioned on the base, thereby achieving the purpose of adjusting the angle. The above is the technology of conventional sofa hinges in this field.

[0030] In order to enable the second bracket 2 and the first bracket 1 to rotate relative to each other at an angle greater than 100 degrees, so that the sofa backrest can be folded at the upper end surface of the sofa base or near the upper end surface of the sofa base, the following design is also made: the lever 3 is also provided with an extension piece 5 that can slide relatively along its length direction, and the end of the extension piece 5 extends out of one end of the lever 3, and the end of the extension piece 5 is also provided with an extension groove 51 that is adapted to the gear pin 11 and is obliquely distributed. When the second bracket 2 and the first bracket 1 are rotated to the maximum angle, the end of one end of the lever 3 completely leaves the shift pin 11. At this time, the extension groove 51 at the end of the extension piece 5 is hooked on the shift pin 11, and the extension piece 5 can slide relative to the length direction of the lever 3 and extend as an extension arm of the lever 3, thereby preventing the structure formed by the combination of the lever 3 and the extension piece 5 from detaching from the shift pin 11, thereby expanding the relative rotation angle between the second bracket 2 and the first bracket 1. The minimum angle formed between the second bracket 2 and the first bracket 1 is 0 degrees or close to 0 degrees, and the maximum angle formed between the second bracket 2 and the first bracket 1 is 180 degrees, that is, the maximum relative rotation angle between the second bracket 2 and the first bracket 1 is 180 degrees or close to 180 degrees, thereby meeting the purpose of folding the sofa backrest at the upper end surface of the sofa base or close to the upper end surface of the sofa base, thereby reducing the volume of the entire sofa, making the sofa occupy a small space, so as to facilitate packaging and transportation.

[0031] The assembly structure of the extension piece 5 and the lever 3 is:

[0032] The middle cross-section of the lever 3 is in the shape of a square frame with an opening at the bottom, and the extension piece 5 is arranged in the lever 3, wherein a sliding pin 32 is arranged in the lever 3, and a first strip-shaped slide groove 52 distributed along its length direction is arranged in the middle of the extension piece 5, and the sliding pin 32 is passed through the first strip-shaped slide groove 52, so that the extension piece 5 can be installed in the lever 3 in a slidable manner.

[0033] The lever 3 is also provided with a blocking piece 6 that can slide relatively along its length direction and can be used to block the first gear slot 31. The blocking piece 6 has a second gear slot 61 adapted to the first gear slot 31 and a blocking portion 62 located beside the second gear slot 61. When the blocking piece 6 slides relative to the lever 3 until the second gear slot 61 is misaligned with the first gear slot 31, the blocking portion 62 is located beside the opening of the first gear slot 31, so that the first gear slot 31 cannot be locked with the gear pin 11. When the extension slot 51 at the end of the extension piece 5 is hooked on the gear pin 11, the blocking piece 6 is in a fixed assembly state with the extension piece 5, and when the second gear slot 61 is misaligned with the first gear slot 31, the blocking portion 62 is located beside the opening of the first gear slot 31, so that the first gear slot 31 cannot be locked with the gear pin 11.

[0034] The assembly structure of the baffle 6 and the lever 3 is as follows:

[0035] The middle part of the blocking piece 6 is provided with a second strip-shaped slide groove 63 distributed along its length direction, and the sliding pin 32 is penetrated in the second strip-shaped slide groove 63, so that the blocking piece 6 is slidably installed in the lever 3, and the end of the blocking piece 6 and the end of the extension piece 5 are respectively provided with a matching first positioning hole 64 and a second positioning hole 53. When the positioning member 7 is penetrated in the first positioning hole 64 and the second positioning hole 53, the blocking piece 6 and the extension piece 5 are fixed together, and the rear side of the first strip-shaped slide groove 52 contacts the gear pin 11, and the front side of the second strip-shaped slide groove 63 contacts the gear pin 11, so that the blocking piece 6 and the extension piece 5 are both fixed together with the lever 3, and at this time, the blocking portion 62 is located beside the opening of the first gear slot 31.

[0036] The front end of the blocking piece 6 is provided with an inclined edge 65 , and the inclination angle of the inclined edge 65 is the same as the inclination angle of the extension groove 51 .

[0037] The first bracket 1 is provided with a bent first limiting plate 8, and a limiting space 81 is formed between the first limiting plate 8 and the first bracket 1, and the two ends of the shift pin 11 are fixedly connected to the first bracket 1 and the first limiting plate 8 respectively, and the lever 3 passes through the limiting space 81 and can slide relatively.

[0038] The second bracket 2 is provided with a bent second limiting piece 9 , and both ends of the pin shaft 21 are respectively fixed to the second limiting piece 9 and the second bracket 2 . The lever 3 is also inserted into the gap formed between the second limiting piece 9 and the second bracket 2 .

[0039] The first limiting piece 8 is also provided with an avoidance groove 82 at its edge, which is mainly used to avoid the positioning member 7, and can ensure that the positioning member 7 positions the extension piece 5 and the baffle 6, so that the extension piece 5 and the baffle 6 cannot retreat relative to the first limiting piece 8. When in normal use, that is, when the sofa or sofa bed needs to be formed into a use state, the positioning member 7 needs to be pulled out, so that the extension piece 5 and the baffle 6 can slide freely relative to the lever 3. For example, when the baffle 6 is in use, the baffle 6 slides downward relative to the lever 3 under the action of its own gravity, so that the second gear slot 61 corresponds to the first gear slot 31, so that the second gear slot 61 and the first gear slot 31 can be locked with the gear pin 11 in the later stage, so that the function of the lever 3 is normally reflected.

[0040] The inner side surface of the first limiting plate 8 is provided with a first convex rib 83 which is used to reduce the contact area and protrudes inward, and the outer side surface of the first bracket 1 is provided with a second convex rib 12 which is used to reduce the contact area and protrudes outward; the first convex rib 83 and the second convex rib 12 are distributed outside the two sides of the lever 3, and the lever 3 is in contact with at least one of the first convex rib 83 and the second convex rib 12, so that when the lever 3 slides, the contact area with the first limiting plate 8 and the first bracket 1 is extremely small, which can not only reduce wear but also improve the smoothness of the lever 3 when sliding.

[0041] A hook hole 33 is provided at the other end of the lever 3, and the first hook portion 41 at one end of the spring 4 is hooked and connected with the hook hole 33; the second bracket 2 is also bent to form a hook rod 23, and the second hook portion 42 at the other end of the spring 4 is hooked and connected with the hook rod 23, so that the spring 4 is stably connected to the lever 3 and the first bracket 1.

[0042] A hook groove 231 is disposed on the outer side of the hook rod 23 , and the second hook portion 42 is hooked in the hook groove 231 , which further ensures the stability of the assembly and prevents the second hook portion 42 from accidentally detaching from the hook rod 23 .

[0043] To sum up, when the second bracket 2 and the first bracket 1 are rotated to the maximum angle, the end of one end of the lever 3 completely leaves the gear pin 11. At this time, the extension groove 51 at the end of the extension piece 5 is hooked on the gear pin 11, and the extension piece 5 can slide relative to the length direction of the lever 3 and extend as an extension arm of the lever 3, thereby preventing the structure formed by the combination of the lever 3 and the extension piece 5 from detaching from the gear pin 11, thereby expanding the relative rotation angle between the second bracket 2 and the first bracket 1. The minimum angle formed between the second bracket 2 and the first bracket 1 is 0 degrees or close to 0 degrees, and the maximum angle formed between the second bracket 2 and the first bracket 1 is 180 degrees, that is, the maximum relative rotation angle between the second bracket 2 and the first bracket 1 is 180 degrees or close to 180 degrees, thereby meeting the purpose of folding the sofa backrest at the upper end surface of the sofa base or close to the upper end surface of the sofa base, thereby reducing the volume of the entire sofa, making the sofa occupy a small space, and facilitating packaging and transportation.

[0044] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A butterfly hinge, comprising: A first bracket (1) provided with a shift pin (11); A second bracket (2) hingedly connected to the first bracket (1), and provided with a pin shaft (21); A lever (3), the lever (3) being rotatably mounted on the second bracket (2) via a pin shaft (21), and having a plurality of inclined first gear slots (31) disposed at one end of the lever (3), the other end of the lever (3) being connected to the second bracket (2) via a spring (4), and under the elastic action of the spring (4), the first gear slots (31) can be snap-fitted and positioned on the gear pin (11); Features: The lever (3) is also provided with an extension piece (5) which can slide relatively along its length direction, the end of the extension piece (5) protruding out of one end of the lever (3), and the end of the extension piece (5) is also provided with an extension groove (51) which is adapted to the shift pin (11) and is distributed obliquely.

2. A butterfly hinge according to claim 1, characterized in that: A sliding pin (32) is arranged in the lever (3), and a first strip-shaped sliding groove (52) is arranged in the middle of the extension piece (5) along its length direction. The sliding pin (32) is inserted into the first strip-shaped sliding groove (52), so that the extension piece (5) is slidably mounted in the lever (3).

3. The butterfly hinge according to claim 2, characterized in that: The lever (3) is further provided with a blocking piece (6) which can slide relatively along its length direction and can be used to block the first gear slot (31); the blocking piece (6) has a second gear slot (61) adapted to the first gear slot (31) and a blocking portion (62) located beside the second gear slot (61); when the blocking piece (6) slides relative to the lever (3) until the second gear slot (61) is misaligned with the first gear slot (31), the blocking portion (62) is located beside the opening of the first gear slot (31), so that the first gear slot (31) cannot be locked with the gear pin (11).

4. The butterfly hinge according to claim 3, characterized in that: The blocking piece (6) is provided with a second strip-shaped slide groove (63) distributed along its length direction in the middle part, and the sliding pin (32) is inserted into the second strip-shaped slide groove (63), so that the blocking piece (6) is slidably installed in the lever (3), and the end of the blocking piece (6) and the end of the extension piece (5) are respectively provided with a first positioning hole (64) and a second positioning hole (53) that match each other. When the positioning member (7) is inserted into the first positioning hole (64) and the second positioning hole (53), the blocking piece (6) and the extension piece (5) are fixed together, and the rear side of the first strip-shaped slide groove (52) contacts the gear pin (11), and the front side of the second strip-shaped slide groove (63) contacts the gear pin (11), so that the blocking piece (6) and the extension piece (5) are both fixed together with the lever (3), and at this time, the blocking portion (62) is located beside the opening of the first gear slot (31).

5. The butterfly hinge according to claim 4, characterized in that: The front end of the blocking piece (6) is provided with an inclined edge (65), and the inclination angle of the inclined edge (65) is the same as the inclination angle of the extension groove (51).

6. A butterfly hinge according to any one of claims 1 to 5, characterized in that: The first bracket (1) is provided with a bent first limiting piece (8), a limiting space (81) is formed between the first limiting piece (8) and the first bracket (1), and two ends of the shift pin (11) are respectively fixedly connected to the first bracket (1) and the first limiting piece (8), and the lever (3) passes through the limiting space (81) and can slide relatively thereto.

7. The butterfly hinge according to claim 6, characterized in that: An avoidance groove (82) is also provided at the edge of the first limiting piece (8).

8. The butterfly hinge according to claim 6, characterized in that: The first limiting piece (8) is provided with a first convex rib (83) on the inner side surface thereof for reducing the contact area and protruding inwards, and the first bracket (1) is provided with a second convex rib (12) on the outer side surface thereof for reducing the contact area and protruding outwards; the first convex rib (83) and the second convex rib (12) are distributed outside the two sides of the lever (3), and the lever (3) is in contact with at least one of the first convex rib (83) and the second convex rib (12).

9. A butterfly hinge according to any one of claims 1 to 5, characterized in that: The other end of the lever (3) is provided with a hook hole (33), and a first hook portion (41) at one end of the spring (4) is hooked and connected to the hook hole (33); the second bracket (2) is also bent to form a hook rod (23), and a second hook portion (42) at the other end of the spring (4) is hooked and connected to the hook rod (23).

10. The butterfly hinge according to claim 9, characterized in that: A hook groove (231) is provided on the outer side of the hook rod (23), and the second hook portion (42) is hooked in the hook groove (231).

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