Folding frame of bicycle

Abstract

The utility model discloses a folding frame of a bicycle. The folding frame comprises a main cross beam, an upper stand column and a lower stand column, wherein the upper stand column is vertically fixed below the rear end of the main cross beam; the upper stand column is provided with a longitudinally-formed first shaft hole, and the lower tail end of the first shaft hole is provided with a first stop cavity. The lower stand column is provided with a second shaft hole corresponding to the first shaft hole, and the upper tail end of the second shaft hole is provided with a second stop cavity; the first shaft hole and the second shaft hole are connected through a rotating shaft, a first limiting block is fixed to the rotating shaft, and the height of the first limiting block is larger than the depth of the second stopping cavity. An elastic piece is arranged at one end of the first limiting block; when the first limiting block is in limiting fit with the first stopping cavity and the second stopping cavity, the locking state is achieved; when the rotating shaft moves upwards to enable the lower end of the first limiting block to be separated from the second stopping cavity, the unlocking state is achieved. The folding frame has the advantages of simple and reliable structure, convenience in operation and use and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycles, in particular to a foldable bicycle frame. Background Art

[0002] The existing folding bicycles use folding frames to achieve folding, which makes the overall size of the product smaller after folding, making it convenient to store or carry in the trunk of a car. However, the folding frames of the existing technology are generally not stable enough, and are prone to vibration and loosening during riding, thereby causing safety hazards. In addition, the folding and unfolding operations are cumbersome and inconvenient for users to operate and use. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art and proposes a

[0004] The utility model provides a folding bicycle frame, comprising a main crossbeam, an upper column vertically fixed below the rear end of the main crossbeam, and a lower column coaxially arranged with the upper column;

[0005] The upper column has a first axial hole arranged longitudinally, and the lower end of the first axial hole has a first stop cavity;

[0006] The lower column has a second shaft hole corresponding to the first shaft hole, and the upper end of the second shaft hole has a second stop cavity;

[0007] The first shaft hole is connected to the second shaft hole through a rotating shaft, a first stop block is fixed on the rotating shaft, and the height of the first stop block is greater than the depth of the second stop cavity;

[0008] An elastic member is provided at one end of the first limit block, and the elastic member generates a downward elastic force on the first limit block;

[0009] When the lower end of the first limit block is in position-limiting cooperation with the second stop cavity and the upper end of the first limit block is in position-limiting cooperation with the first stop cavity, the lower column cannot rotate relative to the upper column;

[0010] When the rotating shaft moves upward to make the lower end of the first limit block disengage from the second stop cavity, the lower column is in an unlocked state, and the lower column can rotate relative to the upper column according to the rotating shaft.

[0011] In some preferred embodiments, the elastic member is a spring, which is sleeved on the upper end of the rotating shaft, and the lower end of the spring abuts against the upper end of the first limiting block.

[0012] In some preferred embodiments, two opposite inner side walls of the second stop cavity are respectively provided with grooves, and two opposite vertical side surfaces of the first limit block are respectively provided with protrusions, which are limitedly matched with the grooves.

[0013] In some preferred embodiments, the rotating shaft includes a sleeve and a shaft rod inserted in the sleeve, and the upper end of the shaft rod is fixed to the top end of the sleeve by an adjusting nut; the first limit block is sleeved on the sleeve, and the first limit block is fixedly connected to the lower end of the shaft rod.

[0014] In some preferred embodiments, a longitudinally extending adjustment groove is provided on the sleeve; a first fixing hole and a second fixing hole are respectively provided on the lower end of the first limit block and the shaft rod, and a fixing column passes through the first fixing hole, the adjustment groove and the second fixing hole in sequence to fix the first limit block to the lower end of the shaft rod.

[0015] In some preferred embodiments, the lower end of the sleeve has a limiting end cap, and in the unlocked state the limiting end cap abuts against the bottom end of the second shaft hole so that the lower end of the rotating shaft will not be separated from the lower column.

[0016] In some preferred embodiments, a stop groove is provided at the top end of the shaft sleeve; a gasket with a stop column is provided between the top end of the shaft sleeve and the adjusting nut, and the stop column is located in the stop groove.

[0017] In some preferred embodiments, the upper column further has a first longitudinal hole, and the first longitudinal hole is spaced apart from the first axial hole;

[0018] The upper end of the lower column has a second longitudinal hole arranged corresponding to the first longitudinal hole;

[0019] A connecting rod is arranged in the first longitudinal hole. The lower end of the connecting rod is inserted into the second longitudinal hole in a locked state, and the lower end of the connecting rod is separated from the second longitudinal hole in an unlocked state.

[0020] In some preferred embodiments, the lower end of the connecting rod has a second stop block that is not cylindrical, and the second stop cavity has a shape that matches the second stop block.

[0021] In some preferred embodiments, the folding frame further includes a linkage handle, and the top ends of the rotating shaft and the connecting rod are connected to the linkage handle, so that the rotating shaft and the connecting rod can be driven by the linkage handle to move upward in the axial direction of the rotating shaft.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The folding frame disclosed by the utility model has an upper column and a lower column directly connected by a rotating shaft, and the upper column and the lower column are locked by fixing a first limit block on the rotating shaft and cooperating with a first stop cavity at the lower end of the upper column and a second stop cavity at the top end of the lower column. The first limit block maintains a stable and reliable locking state under the action of its own downward gravity and the downward elastic force generated by the elastic member, and is switched to an unlocked state only when the rotating shaft moves upward to allow the first limit block to disengage from the second stop cavity. Therefore, it is not easy to get loose due to external forces such as vibration or scratching during riding of the bicycle, and the structure is reliable, which is conducive to improving the safety of the bicycle.

[0024] In addition, under the downward elastic force generated by the elastic member on the first limit block, when the folding frame is folded or folded and unfolded, after the lower column drives the rear wheel assembly to rotate into place, the elastic force is used to make the first limit block self-locking, so the overall structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a bicycle.

[0026] Figure 2 It is a three-dimensional structural schematic diagram of a folding frame.

[0027] Figure 3 It is one of the exploded structural diagrams of the folding frame.

[0028] Figure 4 This is the second schematic diagram of the decomposition structure of the folding frame.

[0029] Figure 5 It is a structural diagram of the upper column.

[0030] Figure 6 It is a schematic diagram of the decomposed structure of the rotating shaft. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purpose, the specific implementation methods, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0032] like Figure 1As shown, the bicycle generally refers to a foldable non-electric bicycle and a foldable electric bicycle. The bicycle includes a foldable frame 100, a front wheel assembly 200 and a rear wheel assembly 300, wherein the front wheel assembly 200 and the rear wheel assembly 300 are respectively mounted at the front end and the rear end of the foldable frame 100. The foldable frame 100 can be used to allow the rear wheel assembly 300 to be flipped toward one side of the foldable frame 100 as a whole, so that the rear wheel assembly 300 as a whole overlaps with the foldable frame 100, and the size is small after folding, requiring less storage space, and is convenient for storage and carrying.

[0033] Please combine the specific Figure 2-Figure 6 As shown, the folding frame 100 includes a main cross beam 1, an upper column 2 erected and fixed below the rear end of the main cross beam 1, and a lower column 3 coaxially arranged with the upper column 2; a seat mounting tube 21 for mounting a seat is provided at the upper end of the upper column 2, and the seat mounting tube 21 passes upward through the assembly hole 11 at the rear end of the main cross beam 1, so that the upper column 2 is erected and fixedly assembled below the rear end of the main cross beam 1; the lower end of the lower column 3 is fixedly connected to the lower cross beam 301 of the rear wheel assembly 300, so that the lower column 3 and the rear wheel assembly 300 are integrated or integral structures.

[0034] The upper column 2 has a first axial hole 22 arranged longitudinally, and the lower end of the first axial hole has a first stop cavity 23; the lower column 3 has a second axial hole 31 arranged corresponding to the first axial hole 22, and the upper end of the second axial hole 31 has a second stop cavity 32; the first axial hole 22 is connected to the second axial hole 31 through a rotating shaft 4, and a first limit block 5 is fixed on the rotating shaft 4, and the height of the first limit block 5 is greater than the depth of the second stop cavity 32; an elastic member (not shown in the figure) is provided at one end of the first limit block 5, and the elastic member generates a downward elastic force on the first limit block 5.

[0035] Since the height of the first limit block 5 is greater than the depth of the second stop cavity 32, when the lower end of the first limit block 5 is limited and matched with the second stop cavity 32, the upper end of the lower column 3 is abutted and connected with the lower end of the upper column 2, and the upper end of the first limit block 5 is limited and matched with the first stop cavity 23, and the folding frame is in a locked state. Figure 1 and Figure 2 Status shown.

[0036] It is understandable that when the folding frame is in a locked state, the relative positions of the lower column 3 and the upper column 2 are fixed, so that the lower column 3 cannot rotate relative to the upper column 2.

[0037] If the rear wheel assembly 300 needs to be rotated so that it is folded to a folded state overlapping with the main cross beam 1, or if the rear wheel assembly 300 needs to be folded and unfolded relative to the main cross beam 1 in the folded state, the rotating shaft 4 is moved up a certain distance so that the lower end of the first limit block 5 is disengaged from the second stop cavity 32. At this time, the lower column 3 is no longer limited by the first limit block 5, and the folding frame 100 is switched from the locked state to the unlocked state. At this time, the lower column 3 can be rotated relative to the upper column 2 according to the rotating shaft 4.

[0038] The elastic member is preferably a spring, which is sleeved on the upper end of the rotating shaft 4 , and the lower end of the spring abuts against the upper end of the first limit block 5 .

[0039] Preferably, the two opposite inner side walls of the second stop cavity 32 are respectively provided with grooves, and the two opposite vertical sides of the first stop block 5 are respectively provided with protrusions, which cooperate with the grooves to achieve self-locking after the lower column 3 rotates relative to the upper column 2 through the cooperation between the protrusions and the grooves.

[0040] Especially combined with Figure 4 and Figure 6 As shown, the rotating shaft 4 includes a sleeve 41 and a shaft rod 42 inserted in the sleeve 41, and the upper end of the shaft rod 42 is fixed to the top end of the sleeve 41 through an adjusting nut 43; the first limit block 5 is sleeved on the sleeve 41, and the first limit block 5 is fixedly connected to the lower end of the shaft rod 42.

[0041] The shaft sleeve 41 is provided with a longitudinally extending adjustment slot 412; the first stopper 5 and the lower end of the shaft rod 42 are provided with a first fixing hole 51 and a second fixing hole 421 respectively, and a fixing column (not shown in the figure) passes through the first fixing hole 51, the adjustment slot 412 and the second fixing hole 421 in sequence to fix the first stopper 5 and the lower end of the shaft rod 42. This structure provides the adjustment of the length of the shaft rod 42 inserted into the shaft sleeve 41 by adjusting the nut 43, thereby adjusting the height position of the first stopper 5 fixed on the shaft sleeve 41, and by making the height position of the first stopper 5 fixed on the rotating shaft 4 adjustable, the rotating shaft 4 can meet the adaptability of the lower column 3 and the upper column 2 of different axial sizes when cooperating with the first stopper 5.

[0042] A limiting end cap 411 is provided at the lower end of the sleeve 41. In the unlocked state, the limiting end cap 411 abuts against the bottom end of the second shaft hole 31 to prevent the lower end of the rotating shaft 4 from being separated from the lower column 3, so that the lower column 3 forms a reliable structural connection with the upper column 2 through the rotating shaft 4.

[0043] A stop groove 413 is provided at the top of the sleeve 41, and a washer 44 with a stop column 441 is provided between the top of the sleeve 41 and the adjusting nut 43, and the stop column 441 is located in the stop groove 413. The washer 44 is provided to prevent the adjusting nut 43 from loosening, thereby improving the reliability of fixing the shaft 42 to the sleeve 41 by using the adjusting nut 43.

[0044] Recombination Figure 2-Figure 6 As shown, the upper column 2 also has a first longitudinal hole 24, which is spaced apart from the first axial hole 22; the upper end of the lower column 3 has a second longitudinal hole 33 corresponding to the first longitudinal hole 24; and a connecting rod 6 is provided in the first longitudinal hole 24.

[0045] When the first limit block 5 is in a locked state with the second stop cavity 32, the lower end of the connecting rod 6 is inserted into the second longitudinal hole 33. At this time, the upper column 2 and the lower column 3 are respectively limited at different positions by the first limit block 5 and the connecting rod 6, and the two cooperate to provide the reliability of the locked state.

[0046] When the first limit block 5 is in the unlocked state after being released from the second stop cavity 32 , the lower end of the connecting rod 6 is separated from the second longitudinal hole 33 , so that the connecting rod 6 will not affect the rotation of the lower column 3 relative to the upper column 2 .

[0047] The lower end of the connecting rod 6 has a second limiting block 61 which is not cylindrical, and the second stopping cavity 33 has a shape matching the second limiting block 61 .

[0048] In addition, the folding frame 100 further includes a linkage handle 7 , and the top ends of the rotating shaft 4 and the connecting rod 6 are connected to the linkage handle 7 , so that the rotating shaft 4 and the connecting rod 6 can be driven by the linkage handle 7 to move upward in the axial direction of the rotating shaft 4 .

[0049] Of course, an extension rod 45 can be added to the top of the shaft rod 42 to be fixedly connected to the linkage handle 7.

[0050] When the linkage handle 7 drives the rotating shaft 4 and the connecting rod 6 to move upward synchronously, the folding frame 100 is switched from the locked state to the unlocked state; in the unlocked state, when the linkage handle 7 is released, the elastic member generates a downward elastic force on the first limit block 5, and the linkage handle 7 cooperates to allow the elastic force to act synchronously on the rotating shaft 4 and the connecting rod 6. When the rear wheel assembly 300 uses the lower column 3 to rotate the rotating shaft 4 into place, the protrusions on the two opposite vertical sides of the first limit block 5 are aligned with the grooves on the two opposite inner walls of the second stop cavity 32. Under the action of the elastic force, the first limit block 5 is inserted into the second stop cavity 32, and the protrusion is inserted into the groove to achieve self-locking. At the same time, the second limit block 61 of the connecting rod 6 is inserted downward into the second stop cavity 33 to achieve limit cooperation, so that the folding frame automatically switches from the unlocked state to the self-locking state after rotating into place.

[0051] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A folding bicycle frame, comprising a main crossbeam, an upper column fixed below the rear end of the main crossbeam, and a lower column coaxially arranged with the upper column, characterized in that: The upper column has a first axial hole arranged longitudinally, and the lower end of the first axial hole has a first stop cavity; The lower column has a second shaft hole corresponding to the first shaft hole, and the upper end of the second shaft hole has a second stop cavity; The first shaft hole is connected to the second shaft hole through a rotating shaft, a first stop block is fixed on the rotating shaft, and the height of the first stop block is greater than the depth of the second stop cavity; An elastic member is provided at one end of the first limit block, and the elastic member generates a downward elastic force on the first limit block; When the lower end of the first limit block is in position-limiting cooperation with the second stop cavity and the upper end of the first limit block is in position-limiting cooperation with the first stop cavity, the lower column cannot rotate relative to the upper column; When the rotating shaft moves upward to make the lower end of the first limit block disengage from the second stop cavity, the lower column is in an unlocked state, and the lower column can rotate relative to the upper column according to the rotating shaft.

2. The folding frame according to claim 1, characterized in that: The elastic member is a spring, which is sleeved on the upper end of the rotating shaft, and the lower end of the spring abuts against the upper end of the first limiting block.

3. The folding frame according to claim 1, characterized in that: Two opposite inner side walls of the second stop cavity are respectively provided with grooves, and two opposite vertical side surfaces of the first limit block are respectively provided with protrusions, which are limitedly matched with the grooves.

4. The folding frame according to claim 1, characterized in that: The rotating shaft includes a shaft sleeve and a shaft rod inserted in the shaft sleeve, and the upper end of the shaft rod is fixed to the top end of the shaft sleeve through an adjusting nut; the first limit block is sleeved on the shaft sleeve, and the first limit block is fixedly connected to the lower end of the shaft rod.

5. The folding frame according to claim 4, characterized in that: A longitudinally extending adjustment groove is provided on the sleeve; a first fixing hole and a second fixing hole are respectively provided at the lower end of the first limit block and the shaft rod, and a fixing column passes through the first fixing hole, the adjustment groove and the second fixing hole in sequence to fix the first limit block to the lower end of the shaft rod.

6. The folding frame according to claim 4, characterized in that: The lower end of the shaft sleeve is provided with a limiting end cap, and in the unlocked state, the limiting end cap abuts against the bottom end of the second shaft hole so that the lower end of the rotating shaft will not be separated from the lower column.

7. The folding frame according to claim 4, characterized in that: A stop groove is arranged at the top of the shaft sleeve; a gasket with a stop column is arranged between the top of the shaft sleeve and the adjusting nut, and the stop column is located in the stop groove.

8. The folding frame according to any one of claims 1 to 7, characterized in that: The upper column also has a first longitudinal hole, and the first longitudinal hole is spaced apart from the first axial hole; The upper end of the lower column has a second longitudinal hole arranged corresponding to the first longitudinal hole; A connecting rod is arranged in the first longitudinal hole. The lower end of the connecting rod is inserted into the second longitudinal hole in a locked state, and the lower end of the connecting rod is separated from the second longitudinal hole in an unlocked state.

9. The folding frame according to claim 8, characterized in that: The lower end of the connecting rod is provided with a second limiting block, and the second stopping cavity has a shape matched with the second limiting block, so that the second limiting block can be inserted into the second stopping cavity to achieve limiting cooperation.

10. The folding frame according to claim 8, characterized in that: It also includes a linkage handle, and the top ends of the rotating shaft and the connecting rod are connected to the linkage handle, so that the rotating shaft and the connecting rod can be driven by the linkage handle to move upward in the axial direction of the rotating shaft.

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