Folding joint device

Abstract

The present invention discloses a folding joint device, including a first folding block and a second folding block with a hollow interior, wherein a movable main shaft passes through the middle of a U-shaped first connecting piece and a second connecting piece and is hingedly connected; one end of the first connecting piece is hinged to a first hinge shaft provided in the first folding block, and the other end of the first connecting piece is hinged to a fourth hinge shaft fixedly provided in the second folding block; one end of the second connecting piece is hinged to a third hinge shaft provided in the second folding block, and the other end of the second connecting piece is hinged to a second hinge shaft fixedly provided in the first folding block; both ends of the first hinge shaft are movably arranged in a first slide rail groove in the first folding block, and both ends of the third hinge shaft are movably arranged in a second slide rail groove in the second folding block. The folding joint device is convenient to fold, has high strength, and is easy to manufacture and assemble.

Description

Technical Field

[0001] The invention relates to a folding joint, in particular to a folding joint device which can be applied to a folding bicycle. Background Art

[0002] The whole world is advocating energy conservation and emission reduction, and my country is a well-deserved bicycle power. Folding bicycles and folding electric vehicles have become a very important type of travel vehicles because of their convenience in carrying and small space occupation, and are becoming more and more popular.

[0003] Most of the existing folding bicycles and folding electric vehicles have a folding joint in the middle of the frame. For example, Chinese patent CN201220642260.5 discloses a "folding joint for folding bicycles", which includes an outer connecting plate and an inner connecting plate of a cavity connected by a hinge shaft. The hinge shaft is the only rotating shaft and cannot bear a large load, so it is only suitable for light folding bicycles. When the rider is heavy or rides on bumpy roads for a long time, there is a risk of deformation or breakage. In addition, the single hinge shaft limits the folding angle of the outer connecting plate and the inner connecting plate when they are opened, making it more laborious to fold the bicycle, and the appearance after folding is not neat, which is not conducive to storage or packaging. Summary of the invention

[0004] The invention aims to provide a folding joint device which is convenient to fold, has high load-bearing strength and is easy to manufacture.

[0005] The present invention is implemented as follows: a folding joint device comprises a first folding block and a second folding block with a hollow interior, wherein a movable main shaft passes through the middle of a U-shaped first connecting piece and the second connecting piece and is hingedly connected; one end of the first connecting piece is hinged to a first hinge shaft provided in the first folding block, and the other end of the first connecting piece is hinged to a fourth hinge shaft fixedly provided in the second folding block; one end of the second connecting piece is hinged to a third hinge shaft provided in the second folding block, and the other end of the second connecting piece is hinged to a second hinge shaft fixedly provided in the first folding block; both ends of the first hinge shaft are movably provided in a first slide rail groove in the first folding block, and both ends of the third hinge shaft are movably provided in a first slide rail groove in the first folding block. Placed in the second slide rail groove in the second folding block; the first folding block and the second folding block are respectively provided with a first recess and a second recess on their outer edges, and when the first folding block and the second folding block are in a buckled state, the first recess and the second recess correspond in position and are connected; the first recess is fixed with a fifth hinge shaft, and the second recess is fixed with a sixth hinge shaft; a locking device is provided in the space jointly formed by the first recess and the second recess, and the locking device has an eccentric handle and a connecting rod, the front end of the eccentric handle is hinged to the sixth hinge shaft, the front end of the connecting rod is connected to the fifth hinge shaft, and the tail end of the connecting rod is connected to the inner side of the eccentric handle.

[0006] The axis centerline of the movable main shaft is parallel to the axis centers of the first hinge shaft, the second hinge shaft, the third hinge shaft, the fourth hinge shaft, the fifth hinge shaft and the sixth hinge shaft respectively; the sliding groove directions of the first sliding rail groove and the second sliding rail groove are both perpendicular to the axis centerline of the movable main shaft.

[0007] The first slide rail grooves and the second slide rail grooves are both two inwardly facing each other; when the first folding block and the second folding block are engaged, the slide groove directions of the first slide rail grooves and the second slide rail grooves are staggered.

[0008] The first folding block has a first receiving groove on the inner side, and the end portion of the first connecting piece is placed in the first receiving groove and can slide linearly; the second folding block has a second receiving groove on the inner side, and the end portion of the second connecting piece is placed in the second receiving groove and can slide linearly; when the first folding block and the second folding block are buckled, the sliding groove directions of the first receiving groove and the second receiving groove are staggered.

[0009] The front end of the connecting rod is threadedly connected to the fifth hinge shaft, the screw passes through the cross bar arranged on the inner side of the handle, and the front end of the screw is connected to the rear end of the connecting rod.

[0010] The locking device has an "I"-shaped safety buckle, the outer portion of the safety buckle protrudes from the outside of the eccentric handle, the inner portion of the safety buckle is located on the inner side of the eccentric handle, and a spring is arranged between the inner portion and the eccentric handle; the front end of the inner portion of the safety buckle hooks the inner side of the first folding block.

[0011] There are two first connecting plates and two second connecting plates, and the first connecting plates and the second connecting plates are alternately arranged along the movable main axis.

[0012] The first connecting piece has a long arm and a short arm, and the angle between the outer surfaces of the long arm and the short arm ranges from 110 to 135 degrees; the second connecting piece has the same structure as the first connecting piece, and is arranged in a left-right symmetrical direction along the center line.

[0013] When the first folding block is in a buckled state with the second folding block, the outer surface of the eccentric handle is flush with the outer surface of the first folding block on the side where the eccentric handle is placed.

[0014] The side edge of the first folding block has an inner opening, and the side edge of the second folding block has a protrusion, and the inner opening is engaged and matched with the protrusion.

[0015] The folding joint device of the present invention uses a movable main shaft and a first connecting piece and a second connecting piece as a rotating pivot, is easy to fold, can withstand a large load, and is firm and reliable; in a folded and buckled state, the movable main shaft and the first connecting piece, the second connecting piece and the eccentric handle are all located on the inner side of the joint device, without obvious protrusions, and will not cause the risk of scratching the user, and has a beautiful appearance; when the folding joint device is unfolded, due to the mobility of the first connecting piece and the second connecting piece, a perfect 180-degree unfolding can be achieved, so that the bicycle is more neat and tidy after being folded, and is easy to store. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the unfolded state of the folding joint device of the present invention;

[0017] Figure 2 A schematic diagram of the folding joint device of the present invention in the unfolded state from another angle;

[0018] Figure 3 It is a three-dimensional schematic diagram of the folding joint device of the present invention in a buckled state;

[0019] Figure 4 It is a top view schematic diagram of the folding joint device of the present invention in the unfolded state;

[0020] Figure 5 It is a three-dimensional schematic diagram of the folding joint device of the present invention in a buckled state from another angle;

[0021] Figure 6 The folding joint device of the present invention Figure 5 Schematic diagram of the middle AA section;

[0022] Figure 7 It is a three-dimensional schematic diagram of the folding joint device of the present invention in a buckled state from another angle;

[0023] Figure 8 The folding joint device of the present invention Figure 7 Schematic diagram of the middle BB section;

[0024] Fig. 9 It is a three-dimensional schematic diagram of the folding joint device of the present invention with a handle angle;

[0025] Fig.10 It is a partial bottom view of the handle of the folding joint device of the present invention;

[0026] Fig.11 It is a three-dimensional schematic diagram of the folding joint device of the present invention with a handle from another angle;

[0027] Fig.12 It is an exploded schematic diagram of the folding joint device of the present invention;

[0028] Fig.13It is an exploded schematic diagram of the folding joint device of the present invention from another angle;

[0029] Fig.14 Schematic diagram of the connecting piece of the folding joint device of the present invention. DETAILED DESCRIPTION

[0030] Combine the following Figures 1 to 14 The folding joint device of the present invention is further described in detail.

[0031] like Figures 1 to 4 As shown, the folding joint device includes a first folding block 1 and a second folding block 2 with an internal hollow, and a movable main shaft 3 passes through the middle of a U-shaped first connecting piece 4 and a U-shaped second connecting piece 5 to hinge the two together; one end of the first connecting piece 4 is hinged to a first hinge shaft 11 provided in the first folding block, and the other end of the first connecting piece 4 is hinged to a fourth hinge shaft 22 fixedly provided in the second folding block; one end of the second connecting piece 5 is hinged to a third hinge shaft 21 provided in the second folding block, and the other end of the second connecting piece 5 is hinged to a second hinge shaft 12 fixedly provided in the first folding block; both ends of the first hinge shaft 11 are movably provided in a first slide rail groove 15 in the first folding block 1, and both ends of the third hinge shaft 21 are movably provided in a first slide rail groove 15 in the first folding block 1 Placed in the second slide rail groove 25 in the second folding block; the first folding block 1 and the second folding block 2 are respectively provided with a first recess 13 and a second recess 23 on their outer edges, and when the first folding block and the second folding block are in a buckled state, the first recess and the second recess correspond to each other and are connected; the first recess is fixed with a fifth hinge shaft 14, and the second recess is fixed with a sixth hinge shaft 24; a locking device 6 is provided in the enclosed space formed by the first recess and the second recess, and the locking device 6 has an eccentric handle 61 and a connecting rod 62, the front end of the eccentric handle 61 is hinged to the sixth hinge shaft 24, the front end of the connecting rod 62 is connected to the fifth hinge shaft 14, and the tail end of the connecting rod is connected to the inner side of the eccentric handle.

[0032] like Figure 1 , 12 As shown, the axis of the movable main shaft 3 is parallel to the axis of the first hinge shaft 11, the second hinge shaft 12, the third hinge shaft 21, the fourth hinge shaft 22, the fifth hinge shaft 14, and the sixth hinge shaft 24. Figure 2 , 3 As shown in Figures 4, the directions of the first slide rail groove 15 and the second slide rail groove 25 are both perpendicular to the axis centerline of the movable main shaft. Specifically, the first hinge shaft 11 can slide back and forth in the first slide rail groove 15, and the sliding direction of the first hinge shaft 11 along the first slide rail groove 15 is perpendicular to the axis centerline of the movable main shaft 3; the third hinge shaft 21 can slide back and forth in the second slide rail groove 25, and the sliding direction of the third hinge shaft 21 along the second slide rail groove 25 is perpendicular to the axis centerline of the movable main shaft 3.

[0033] The first rail grooves 15 and the second rail grooves 25 are both opened inwardly and arranged opposite to each other. Specifically, the openings of the first rail grooves 15 are all toward the center of the first folding block, and the openings of the second rail grooves 25 are all toward the center of the second folding block. Fig. 9 As shown, the two openings of the first slide rail groove 15 are opposite to each other and are used to contain the two ends of the first hinge shaft 11, thereby limiting the movement direction of the first hinge shaft 11. In addition, by reasonably setting the depth of the first slide rail groove 15, the movement stroke of the first hinge shaft 11 can be limited. Figure 3 As shown, the two openings of the second slide rail groove 25 are opposite to each other, and are used to accommodate the two ends of the third hinge shaft 21, so as to limit the movement direction of the third hinge shaft 21. In addition, by reasonably setting the depth of the second slide rail groove 25, it is used to limit the movement stroke of the third hinge shaft 21. When the first folding block and the second folding block are engaged, the slide groove directions of the first slide rail groove and the second slide rail groove are staggered. Specifically, the slide groove direction of the first slide rail groove 15 refers to the linear sliding direction of the end of the first hinge shaft 11 in the first slide rail groove 15; the slide groove direction of the second slide rail groove 25 refers to the linear sliding direction of the end of the third hinge shaft 21 in the second slide rail groove 25. Specifically, Figure 3 In the middle state, when viewed vertically from top to bottom, the projections of the first slide rail groove and the second slide rail groove onto the bottom surface are staggered. Figure 4 The first folding block and the second folding block are shown in a 180-degree unfolded state, and it can also be seen that the first slide rail groove 15 and the second slide rail groove 25 are arranged in a staggered manner in the horizontal direction at different heights. This arrangement is mainly a compact design for reasonable use of space, and is also a specific assembly requirement for the first connecting piece 4 and the second connecting piece 5.

[0034] like Figure 2 , 3 As shown in Figures 1 and 11, the first folding block 1 has a first receiving groove 16 on its inner side, and the end portion of the first connecting piece 4 is placed in the first receiving groove 16 and can slide linearly; the second folding block 2 has a second receiving groove 26 on its inner side, and the end portion of the second connecting piece 5 is placed in the second receiving groove 26 and can slide linearly. When the first folding block and the second folding block are engaged, the sliding directions of the first receiving groove 16 and the second receiving groove 26 are staggered. Specifically, Figure 3 In the middle state, when viewed vertically from top to bottom, the projections of the notches of the first receiving groove and the second receiving groove to the bottom surface are arranged alternately. Overall, when the third hinge shaft 21 slides along the second slide rail groove 25, the end of the second connecting piece 5 will slide along the second receiving groove 26 synchronously. Figure 4The first folding block and the second folding block are shown in a 180-degree unfolded state. It can also be seen visually that the first receiving groove 16 and the second receiving groove 26 are arranged in a staggered manner at different heights in the horizontal direction. More specifically, the sliding groove direction of the first receiving groove 16 refers to the linear sliding direction of the end of the first connecting piece 4 in the first receiving groove 16; the sliding groove direction of the second receiving groove 26 refers to the linear sliding direction of the end of the second connecting piece 5 in the second receiving groove 26.

[0035] like Figures 5 to 8 , Fig.10 As shown, the fifth hinge shaft 14 is radially provided with a threaded hole, the front end of the connecting rod 62 of the locking device 6 is threadedly connected to the threaded hole of the fifth hinge shaft 14, the screw 63 passes through the cross bar 64 provided inside the eccentric handle, and the front end of the screw 63 is threadedly connected to the threaded hole at the rear end of the connecting rod 62. Therefore, by rotating and adjusting the connecting rod 62, the function of adjusting the tightness of the eccentric handle 61 can be achieved to meet different demand scenarios and the strength preferences of different users.

[0036] like Figure 8 , Fig.11 , Fig.13 As shown, the locking device 6 has an I-shaped safety buckle 65, the outer side 651 of the safety buckle protrudes from the outer side of the eccentric handle 61, the inner side 652 of the safety buckle is located inside the eccentric handle, and a spring 653 is arranged between the inner side 652 and the eccentric handle 61; the front end of the inner side 652 of the safety buckle hooks the inner side position 17 of the first folding block 1. Specifically, when the first folding block 1 and the second folding block 2 are engaged, the spring 653 pushes the inner side 652 of the safety buckle 65, so that the front end of the inner side 652 hooks the inner side position 17, so as to prevent the eccentric handle 61 from accidentally loosening, and plays the role of the second level of protection. When the folding joint needs to be opened, the user only needs to gently push the outer side 651 of the safety buckle in the opposite direction to make the front end of the inner side 652 withdraw from the inner side position 17, and then pull the eccentric handle 61.

[0037] Furthermore, if Figure 1 , Fig.12 , Fig.13 As shown, there are two first connecting pieces 4 and two second connecting pieces 5, and the first connecting pieces 4 and the second connecting pieces 5 are arranged alternately along the active main axis 3. The main function is to increase the strength and stability of the folding joint. Correspondingly, when there are two first connecting pieces and two second connecting pieces, there are also two first accommodating grooves 16 and two second accommodating grooves 26.

[0038] like Fig.12 , 14As shown, the first connecting piece 4 has a long arm 41 and a short arm 42, and the angle α of the outer surface of the long arm 41 and the short arm 42 ranges from 110 to 135 degrees, preferably 120 degrees. Specifically, the first connecting piece portion between the axis O3 of the movable main shaft 3 and the axis O11 of the first hinge shaft 11 is the long arm 41, and the first connecting piece portion between the axis O3 of the movable main shaft 3 and the axis O22 of the fourth hinge shaft 22 is the short arm 42. For the convenience of processing and manufacturing, the second connecting piece 5 has the same structure as the first connecting piece 4, and the second connecting piece 5 and the first connecting piece 4 are arranged symmetrically along the center line L0. In the case where the number of the second connecting piece 5 and the number of the first connecting piece 4 are two, the four connecting pieces themselves have the same structure and are symmetrically staggered. Specifically, the staggered arrangement of the four connecting pieces means that they are connected in series to the movable main shaft in the manner of the first connecting piece, the second connecting piece, the first connecting piece, and the second connecting piece.

[0039] like Figure 8 In the buckled state of the first folding block and the second folding block, the outer surface of the eccentric handle 61 is flush with the outer surface of the first folding block 1 on which the eccentric handle is placed. Specifically, in the folded and buckled state of the joint device, the eccentric handle 61 is entirely hidden in the first recess 13 and the second recess 23 of the first folding block 1 and the second folding block 2, and the outer surface does not protrude. The advantage is that the eccentric handle will not cause scratches and damage, and the appearance is perfectly integrated.

[0040] like Figure 3 As shown, the side edge of the first folding block 1 has an inner opening 18, and the side edge of the second folding block 2 has a protrusion 28, and the inner opening and the protrusion are engaged and matched. The function is to prevent the lateral displacement of the folding joint during the movement, thereby further improving the safety.

[0041] The first folding block and the second folding block of the folding joint device are respectively fixedly connected to the front and rear parts of the beam of the folding bicycle or the folding electric vehicle.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A folding joint device, comprising a first folding block (1) and a second folding block (2) with a hollow interior, characterized in that: The movable main shaft (3) passes through the middle of the U-shaped first connecting piece (4) and the second connecting piece (5) and is hingedly connected; one end of the first connecting piece is hinged to a first hinge shaft (11) provided in the first folding block, and the other end of the first connecting piece is hinged to a fourth hinge shaft (22) fixedly provided in the second folding block; one end of the second connecting piece is hinged to a third hinge shaft (21) provided in the second folding block, and the other end of the second connecting piece is hinged to a second hinge shaft (12) fixedly provided in the first folding block; The two ends of the first hinge shaft are movably arranged in a first slide rail groove (15) in the first folding block, and the two ends of the third hinge shaft are movably arranged in a second slide rail groove (25) in the second folding block; The first folding block and the second folding block are respectively provided with a first notch (13) and a second notch (23) at their outer edges. When the first folding block and the second folding block are in a buckled state, the first notch and the second notch correspond to each other and are connected. The first notch is fixedly provided with a fifth hinge shaft (14), and the second notch is fixedly provided with a sixth hinge shaft (24). A locking device (6) is provided in the space formed by the first recess and the second recess, the locking device comprising an eccentric handle (61) and a connecting rod (62), the front end of the eccentric handle being hinged to the sixth hinge shaft, the front end of the connecting rod being connected to the fifth hinge shaft, and the rear end of the connecting rod being connected to the inner side of the eccentric handle; The axis of the movable main shaft is parallel to the axis of the first hinge shaft, the second hinge shaft, the third hinge shaft, the fourth hinge shaft, the fifth hinge shaft, and the sixth hinge shaft respectively; the sliding groove directions of the first slide rail groove and the second slide rail groove are both perpendicular to the axis of the movable main shaft; The first slide rail groove and the second slide rail groove are both two inwardly facing each other; when the first folding block and the second folding block are engaged, the slide groove directions of the first slide rail groove and the second slide rail groove are staggered; The first folding block has a first receiving groove (16) on its inner side, and the end portion of the first connecting piece is arranged in the first receiving groove and can slide linearly; the second folding block has a second receiving groove (26) on its inner side, and the end portion of the second connecting piece is arranged in the second receiving groove and can slide linearly; when the first folding block and the second folding block are in a buckled state, the sliding groove directions of the first receiving groove and the second receiving groove are staggered; There are two first connecting plates (4) and two second connecting plates (5), and the first connecting plates and the second connecting plates are alternately arranged along the movable main axis; The first connecting piece has a long arm (41) and a short arm (42), and the angle (α) between the outer surfaces of the long arm and the short arm is in the range of 110-135 degrees; the second connecting piece has the same structure as the first connecting piece and is arranged in a left-right symmetrical direction along the center line (L0).

2. The folding joint device according to claim 1, characterized in that: The front end of the connecting rod (62) is threadedly connected to the fifth hinge shaft, the screw (63) passes through the cross bar (64) arranged inside the handle, and the front end of the screw is connected to the rear end of the connecting rod.

3. The folding joint device according to claim 1, characterized in that: The locking device comprises an I-shaped safety buckle (65), an outer portion (651) of the safety buckle protrudes from the outer side of the eccentric handle, an inner portion (652) of the safety buckle is located inside the eccentric handle, and a spring (653) is arranged between the inner portion and the eccentric handle; the front end of the inner portion of the safety buckle hooks the inner side clamping position (17) of the first folding block.

4. The folding joint device according to any one of claims 1 to 3, characterized in that: When the first folding block is in a buckled state with the second folding block, the outer surface of the eccentric handle is flush with the outer surface of the first folding block on the side where the eccentric handle is placed.

5. The folding joint device according to any one of claims 1 to 3, characterized in that: The first folding block side edge has an inner opening (18), and the second folding block side edge has a protrusion (28), and the inner opening is engaged and matched with the protrusion.

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