A folding frame for a bicycle

Abstract

The utility model discloses a folding frame of bicycle belongs to bicycle frame field, including first folding frame, second folding frame, first hinged block and second hinged block, and first folding frame and second folding frame are hinged through first hinged block and second hinged block, first folding frame with second folding frame is commonly equipped with auxiliary structure, the auxiliary structure includes solid rod and locking bolt, be equipped with rectangular cavity in first folding frame, through the auxiliary structure of setting, through the size adaptation of solid rod and the rectangular cavity of first, second folding frame, the accurate cooperation of cooperation guide boss and guide groove, ensure that solid rod is not easy to sway when being stressed, provide solid support for folding part, and the cooperation of two sets of locking bolt with screw thread and positioning screw hole, compared with traditional only rely on spring elasticity's lock hook structure, can effectively avoid the accidental unlocking caused by spring aging or vibration, prevent the frame from suddenly folding.

Description

Technical Field

[0001] This utility model belongs to the field of bicycle frame technology, specifically relating to a folding bicycle frame. Background Technology

[0002] Currently, bicycles on the market are often designed to be foldable in order to reduce the space occupied when not in use and to facilitate transportation.

[0003] According to the patent announcement number CN214001929U, a foldable bicycle frame is known prior art. This patent allows the first and second folding rods to be unlocked and the frame folded simply by pressing the button block of the elastic locking hook. The frame folding and unfolding is quick and convenient. However, the technical solution of this patent has the following defects in actual use: the locking hook in the frame is locked only by the elastic force of the spring into the locking hole. If the elasticity of the spring decreases after long-term use, or if bumps or vibrations are encountered during riding, the locking hook may accidentally disengage from the locking hole, causing the frame to fold suddenly. On the other hand, the first and second folding rods are hinged by the first and second hinge blocks. The connection strength of the folding structure depends on the material and connection method of the hinge blocks. Since the hinge blocks are designed with a single rotating axis, they may deform or wear at the hinge parts after long-term exposure to the impact force during riding, affecting the overall rigidity of the frame. Utility Model Content

[0004] The purpose of this invention is to provide a folding bicycle frame to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a folding frame for a bicycle, comprising a first folding frame, a second folding frame, a first hinge block, and a second hinge block, wherein the first folding frame and the second folding frame are hinged together by the first hinge block and the second hinge block; The first folding frame and the second folding frame are jointly equipped with an auxiliary structure, which includes a solid rod and a locking pin. The first folding frame has a rectangular cavity, the solid rod is disposed in the rectangular cavity, the side wall of the rectangular cavity of the first folding frame has a guide cavity through it, and one end of the solid rod has an adjustment handle, which passes through the guide cavity and extends to the outside of the first folding frame. The second folding frame has a pre-drilled hole, and the locking pin is mounted on the hole.

[0006] In a preferred embodiment, the first folding frame and the first hinge block are fixedly connected in a non-detachable manner, and the second folding frame and the second hinge block are fixedly connected in a non-detachable manner.

[0007] In a preferred embodiment, the external dimensions of the solid rod match the inner wall dimensions of the rectangular cavities of the first folding frame and the second folding frame, and the upper and lower surfaces of the solid rod are respectively provided with guide protrusions. Correspondingly, the upper and lower inner sidewalls of the rectangular cavities of the first folding frame and the second folding frame are provided with guide grooves that cooperate with the guide protrusions.

[0008] In a preferred embodiment, the locking pins are provided in two sets, and each set of locking pins has an outer diameter thread at one end. The inner wall of the second folding frame is provided with a positioning screw hole that matches the locking pin.

[0009] In a preferred embodiment, the auxiliary structure further includes a protective shell, which has a protective cavity and is slidably fitted onto the first folding frame and the second folding frame, respectively.

[0010] In a preferred embodiment, the first hinge block and the second hinge block are provided with protrusions on their end sides, and the protrusions are provided with slots. The protective shell is provided with rubber blocks at opposite positions, and the rubber blocks are adapted to the protrusions.

[0011] In a preferred embodiment, the first folding frame has a front sleeve at its front end, the second folding frame has a rear sleeve at its rear end, the second folding frame has a support rod at its lower part, the support rod has a bushing fixed to one side of the rear sleeve at its lower part, and the rear sleeve has a rear bracket at one end.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The bicycle's folding frame, through its auxiliary structure, adapts the solid rod to the rectangular cavity dimensions of the first and second folding frames. Combined with the precise fit of the guide protrusion and guide groove, it ensures that the solid rod is not easily shaken under force, providing solid support for the folding parts. The two sets of threaded locking pins and positioning screw holes, compared to the traditional locking hook structure that relies solely on spring force, can effectively prevent accidental unlocking due to spring aging or vibration, thus preventing the frame from folding suddenly. The bicycle's folding frame, through the design of its auxiliary structure, balances quick operation with protective functions. Pushing the adjustment lever allows the load-bearing bar to be moved and locked. With the threaded locking pin, operation is simple and the fixation is reliable. The protective shell not only protects the locking part, but its sliding sleeve method and the matching of the rubber block and the protruding groove of the hinge block ensure that it can be firmly installed in the unfolded or folded state of the frame, effectively preventing dust and impurities from entering key components and reducing wear. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a schematic diagram of the solid rod installation structure of this utility model; Figure 3 This is a schematic diagram of the auxiliary structure of this utility model; Figure 4 This is a schematic diagram of the protective shell structure of this utility model.

[0014] In the figure: 1. First folding frame; 11. Guide cavity; 2. Second folding frame; 3. Front sleeve; 4. First hinge block; 5. Second hinge block; 6. Auxiliary structure; 61. Solid rod; 611. Guide protrusion; 62. Adjusting handle; 63. Locking pin; 64. Protective shell; 65. Rubber clip; 7. Slot; 8. Rear sleeve; 9. Support rod; 10. Bushing; 101. Rear bracket. Detailed Implementation

[0015] The present invention will be further described below with reference to the embodiments.

[0016] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0017] Please see Figures 1-4 This utility model provides a folding bicycle frame, including a first folding frame 1, a second folding frame 2, a first hinge block 4, and a second hinge block 5. The first folding frame 1 and the second folding frame 2 are hinged together by the first hinge block 4 and the second hinge block 5. The first folding frame 1 and the first hinge block 4 are fixedly connected in a non-detachable manner, and the second folding frame 2 and the second hinge block 5 are fixedly connected in a non-detachable manner. The first folding frame 1 and the second folding frame 2 are jointly equipped with an auxiliary structure 6, which includes a solid rod 61 and a locking pin 63. The first folding frame 1 has a rectangular cavity, and a solid rod 61 is set inside the rectangular cavity. A guide cavity 11 is opened through the side wall of the rectangular cavity of the first folding frame 1. One end of the solid rod 61 is provided with an adjustment handle 62. The adjustment handle 62 passes through the guide cavity 11 and extends to the outside of the first folding frame 1. The second folding frame 2 has a pre-set through hole, and a locking pin 63 is installed in the through hole. There are two sets of locking pins 63, and one end of each set of locking pins 63 is provided with an outer diameter thread. The inner wall of the second folding frame 2 is provided with a positioning screw hole that matches the locking pin 63.

[0018] In this embodiment, the first folding frame 1 and the second folding frame 2 can be combined by folding the first hinge block 4 and the second hinge block 5. Then, through the auxiliary structure 6, the user can easily control the movement of the solid rod 61 in the rectangular cavity by pushing the adjustment handle 62, which facilitates the quick locking and unlocking of the frame. The threaded connection between the two sets of locking pins 63 and the positioning screw holes is not only simple to operate, but also has a self-locking characteristic, which can ensure the stability of the locked state and avoid locking failure due to external force. Compared with the traditional locking method that relies on spring force, it can better maintain the locking effect in long-term use and reduce the maintenance frequency.

[0019] Please see Figures 1-3 The outer dimensions of the solid rod 61 match the inner dimensions of the rectangular cavities of the first folding frame 1 and the second folding frame 2. The upper and lower surfaces of the solid rod 61 are respectively provided with guide protrusions 611. Correspondingly, the upper and lower inner sidewalls of the rectangular cavities of the first folding frame 1 and the second folding frame 2 are provided with guide grooves that cooperate with the guide protrusions 611.

[0020] In this embodiment, the solid rod 61 and the inner wall of the rectangular cavity are precisely matched in size to form a surface contact support structure, which effectively disperses the lateral shear force and torque generated during riding. The sliding fit between the guide protrusion 611 and the guide groove further constrains the radial displacement of the solid rod 61 and prevents it from shaking or twisting in the rectangular cavity.

[0021] Please see Figures 1-4 The auxiliary structure 6 also includes a protective shell 64, which has a protective cavity. The protective shell 64 is slidably mounted on the first folding frame 1 and the second folding frame 2 respectively. The first hinge block 4 and the second hinge block 5 have protrusions on their ends, and the protrusions have slots 7. The protective shell 64 has rubber blocks 65 at opposite positions, and the rubber blocks 65 are adapted to the protrusions.

[0022] In this embodiment, the protective shell 64 can form a full-wrap protection for the connection part of the first folding frame 1 and the second folding frame 2 through the protective cavity. It can effectively block the mud, sand, rainwater and external collisions splashed during riding from eroding and damaging the articulation block and auxiliary structure 6. Compared with the unprotected design, it can reduce the corrosion rate and wear of the folding parts and extend their service life.

[0023] Please see Figure 1 and Figure 2The first folding frame 1 has a front sleeve 3 at its front end, and the second folding frame 2 is connected to a rear sleeve 8 at its rear end. The second folding frame 2 is supported by a support rod 9 at its lower part, and a bushing 10 fixed to one side of the rear sleeve 8 is connected to the lower part of the support rod 9. A rear bracket 101 is provided at one end of the rear sleeve 8. The front sleeve 3 can be used to install related components of the bicycle's front wheel, and the rear sleeve 8 and the rear bracket 101 can be used to install the bicycle's rear wheel and related support components. The support rod 9 cooperates with the bushing 10 to support the second folding frame 2 and enhance the overall stability of the frame.

[0024] The working principle and usage process of this utility model are as follows: First, the first folding frame 1 and the second folding frame 2, which are in a folded state, are unfolded through the hinge structure of the first hinge block 4 and the second hinge block 5 until they are in a straight line. Then, the adjusting handle 62 is pushed to move it along the guide cavity 11 of the first folding frame 1, causing the solid rod 61 to slide in the rectangular cavity of the first folding frame 1. Since the outer dimensions of the solid rod 61 match the inner wall dimensions of the rectangular cavities of the first folding frame 1 and the second folding frame 2, and the guide protrusion 611 cooperates with the guide groove for guidance, the solid rod 61 can move smoothly into the rectangular cavity of the second folding frame 2. Then, the two sets of locking pins 63 are rotated to connect with the positioning screw holes on the inner wall of the second folding frame 2 through the outer diameter thread, thereby fixing the solid rod 61 and completing the locking of the unfolded frame. Next, push the protective shells 64 at both ends. The rubber clips 65 on the ends of the protective shells 64 will engage in the slots 7 provided in the first hinge block 4 and the second hinge block 5, respectively. At this time, the protective shells 64 are stably positioned. In addition, the protective cavity of the protective shells 64 protects the adjusting handle 62 and the locking pin 63. It is worth noting that the protective shell 64 on the right side is longer, which can also protect the guide cavity 11 inside. Finally, when disassembly is required, push the protective shell 64 in the reverse direction to disengage the rubber clip 65 from the slot 7, slide the protective shell 64 to a position that does not affect folding, then rotate the locking pin 63 in the reverse direction to unscrew it from the positioning screw hole, releasing the fixation on the solid rod 61, push the adjusting handle 62 in the reverse direction to drive the solid rod 61 from the rectangular cavity of the second folding frame 2 back into the rectangular cavity of the first folding frame 1, and fold the first folding frame 1 and the second folding frame 2 together through the hinge structure of the first hinge block 4 and the second hinge block 5, thereby completing the folding of the frame.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A folding frame for a bicycle, comprising a first folding frame (1), a second folding frame (2), a first hinge block (4), and a second hinge block (5), characterized in that: The first folding frame (1) and the second folding frame (2) are hinged together by the first hinge block (4) and the second hinge block (5); The first folding frame (1) and the second folding frame (2) are jointly equipped with an auxiliary structure (6), which includes a solid rod (61) and a locking pin (63). The first folding frame (1) has a rectangular cavity, and the solid rod (61) is set in the rectangular cavity. The side wall of the rectangular cavity of the first folding frame (1) has a guide cavity (11) through it. One end of the solid rod (61) has an adjustment handle (62). The adjustment handle (62) passes through the guide cavity (11) and extends to the outside of the first folding frame (1). The second folding frame (2) has a pre-set perforation, and the locking pin (63) is mounted on the perforation.

2. The folding bicycle frame according to claim 1, characterized in that: The first folding frame (1) and the first hinge block (4) are fixedly connected in a non-detachable manner, and the second folding frame (2) and the second hinge block (5) are fixedly connected in a non-detachable manner.

3. The folding bicycle frame according to claim 1, characterized in that: The outer dimensions of the solid rod (61) match the inner wall dimensions of the rectangular cavities of the first folding frame (1) and the second folding frame (2), and the upper and lower surfaces of the solid rod (61) are respectively provided with guide protrusions (611). Correspondingly, the upper and lower inner sidewalls of the rectangular cavities of the first folding frame (1) and the second folding frame (2) are provided with guide grooves that cooperate with the guide protrusions (611).

4. A folding bicycle frame according to claim 1, characterized in that: The locking pin (63) is provided in two sets, and each set of the locking pin (63) has an outer diameter thread at one end. The inner wall of the second folding frame (2) is provided with a positioning screw hole that matches the locking pin (63).

5. A folding bicycle frame according to claim 1, characterized in that: The auxiliary structure (6) also includes a protective shell (64), which has a protective cavity and is slidably mounted on the first folding frame (1) and the second folding frame (2).

6. A folding bicycle frame according to claim 5, characterized in that: The first hinge block (4) and the second hinge block (5) are provided with protrusions on their end sides. The protrusions are provided with slots (7). The protective shell (64) is provided with rubber blocks (65) at opposite positions. The rubber blocks (65) are adapted to the protrusions.

7. A folding bicycle frame according to claim 1, characterized in that: The first folding frame (1) has a front sleeve (3) at the front end, the second folding frame (2) is connected to a rear sleeve (8) at the rear end, the second folding frame (2) is supported by a support rod (9) at the lower part, the support rod (9) is connected to a bushing (10) fixed to one side of the rear sleeve (8), and a rear bracket (101) is provided at one end of the rear sleeve (8).

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