Bicycle with extensible rear frame
By designing an expandable rear frame, the disassembly and size adjustment of the rear frame of the bicycle is achieved, solving the problem of unstable center of gravity when carrying objects in existing bicycles and improving riding stability.
Patent Information
- Application Number
- CN202422421653.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-05
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-10-05
AI Technical Summary
The rear frame of existing bicycles cannot be disassembled and installed, and the size cannot be adjusted, resulting in unstable center of gravity when carrying objects.
Design a bicycle with an expandable rear frame, which is removable and can be adjusted in size and position through front and rear and left and right adjustment mechanisms to ensure balance in the center of gravity.
It realizes flexible disassembly and assembly and size adjustment of the rear frame, meets the stable load-bearing needs of different items and ensures riding stability.
Smart Images
Figure CN223086164U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bicycles, and particularly relates to a bicycle with an expandable rear frame. Background Art
[0002] Bicycles (including ordinary bicycles and electric bicycles) play an important role in people's lives as means of transportation. Bicycles are not only used for riding to work, but also involve carrying people and goods in some scenarios. Usually, when a bicycle leaves the factory, the needs of carrying people and goods have been taken into account, so a rear frame is installed at the rear of the bicycle. However, the rear frames configured for existing bicycles are usually fixed frames, and there are the following problems: First, the existing rear frames cannot be disassembled and assembled onto the bicycle body as needed; second, the size of the rear frame itself cannot be adjusted and set, making it difficult to meet the need for stable loading of items of different sizes in the cargo-carrying scenario; third, after the items are loaded onto the rear frame, if the center of gravity position of the items is inappropriate, it is easy to cause imbalance during riding.
[0003] In summary, it is necessary to develop and design a bicycle with an expandable rear frame to meet the cargo-carrying needs and solve the aforementioned technical problems. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a bicycle with an expandable rear frame. The rear frame can be disassembled and assembled onto the vehicle body as needed, has a size adjustment function to meet the need for stable loading of items of different sizes, and can adjust the position after the items are loaded to ensure the balance of the vehicle's center of gravity.
[0005] The technical solution adopted by the utility model is: A bicycle with an expandable rear frame includes a main frame; a rear support seat is fixedly installed at the rear of the main frame, and a rear frame is installed on the rear support seat; the rear frame includes a support bottom frame, the support bottom frame is installed on the rear support seat and a front-back adjustment mechanism is provided between the support bottom frame and the rear support seat, two sets of left and right laterally movable translation supports are installed on the support bottom frame, a set of left-side sleeves and a set of right-side sleeves are installed on the two sets of translation supports, the left end of the left-side sleeve is open and a left-side telescopic rod is inserted inside, the right end of the right-side sleeve is open and a right-side telescopic rod is inserted inside, two left and right fixed bases are fixedly installed on the left-side sleeve and the right-side sleeve and a load-carrying support beam is installed on the fixed bases, and movable bases are installed at the outer ends of the left-side telescopic rod and the right-side telescopic rod and a load-carrying support beam is installed on the movable bases.
[0006] Preferably, the support bottom frame includes a horizontal base plate, and two left and right support vertical plates are installed at the bottom of the base plate. The two support vertical plates are respectively located on both sides of the rear support seat and are fixedly connected to the rear support seat by a front-back adjustment mechanism.
[0007] Preferably, the front-back adjustment mechanism includes adjustment mounting holes provided on both sides of the rear support seat. The adjustment mounting holes are threaded holes. Adjustment screws with rotating ends at the outer ends are provided at both the front and rear of the support vertical plate, and the inner ends of the adjustment screws are located within the adjustment mounting holes.
[0008] Preferably, a sliding groove is provided on the inner side of the translation support. The front edge and the rear edge of the base plate are respectively located within the sliding grooves of the front translation support and the rear translation support, constituting a left-right adjustment mechanism.
[0009] Preferably, the left sleeve and the right sleeve are both fixedly welded to the left and right groups of translation supports. The fixed base is fixedly welded to the left sleeve and the right sleeve. The moving base is fixedly welded to the outer ends of the left telescopic rod and the right telescopic rod.
[0010] Preferably, a locking and fixing mechanism is provided between the translation support and the base plate. A locking and fixing mechanism for the left telescopic rod is provided on the side wall of the left sleeve, and a locking and fixing mechanism for the right telescopic rod is provided on the side wall of the right sleeve.
[0011] Preferably, the front part of the load-carrying support beam is fixedly connected to the fixed base and the moving base by screws, and a plurality of vertically penetrating louvers are provided at the rear end of each load-carrying support beam.
[0012] The advantages and positive effects of the present utility model are:
[0013] The present utility model provides a bicycle with an expandable rear frame. A rear support seat is installed at the rear of the main frame, and a rear frame is installed on the rear support seat. The rear frame is detachably connected to the rear support seat, so that the rear frame can be disassembled and assembled according to needs. That is, the rear frame is selected and installed when there is a need to carry goods, and the rear frame is disassembled and a rear seat cushion is installed or not installed on the rear support seat when there is no need to carry goods, and the use is flexible.
[0014] For the rear frame, its left telescopic rod can extend and retract within the left sleeve, and its right telescopic rod can extend and retract within the right sleeve. Correspondingly, on the basis that the positions of the two load-carrying support beams in the middle remain unchanged, the two load-carrying support beams on both sides can both move left and right. Therefore, the width dimension of the rear frame can be adjusted and set according to needs, that is, it has a dimension adjustment function to meet the stable loading needs of different-sized items. The rear frame can be adjusted and shifted front and back, and the load-carrying assembly composed of the translation support, the sleeve, the telescopic rod, and the load-carrying support beam can be adjusted and shifted left and right. Therefore, after the item is loaded, the position can be adjusted to ensure the balance of the vehicle's center of gravity and the stability of riding. Description of the Drawings
[0015] Figure 1 is the front view structural schematic diagram of the present utility model;
[0016] Figure 2 is Figure 1 Schematic diagram of the structure of the rear frame, upper view;
[0017] Figure 3 is Figure 1 Schematic diagram of the structure of the rear frame, lower view.
[0018] In the figure:
[0019] 1. Rear support seat; 2. Adjusting mounting hole; 3. Rear frame; 3-1. Support vertical plate; 3-2. Adjusting screw; 3-3. Base plate; 3-4. Translation support; 3-5. Left sleeve; 3-6. Right sleeve; 3-7. Left telescopic rod; 3-8. Right telescopic rod; 3-9. Fixed base; 3-10. Moving base; 3-11. Carrying support beam; 3-12. Louvered hole; 4. Main frame; 5. Seat assembly; 6. Rear wheel; 7. Pedal and battery; 8. Handlebar assembly; 9. Front wheel; 10. Rear seat cushion. Detailed implementation manners
[0020] To further understand the content, features and effects of the present invention, the following embodiments are given for detailed description.
[0021] Please refer to Figure 1 , the bicycle with an expandable rear frame of the present invention includes a main frame 4. As shown in the figure, a handlebar assembly 8 is installed at the front of the main frame 4, a front wheel 9 is installed at the lower end of the handlebar assembly 8, a rear wheel 6 is installed at the rear of the main frame 4, and a seat assembly 5 is installed at the top of the main frame 4. Figure 1 What is shown in
[0022] is the structural form of an electric bicycle. It can be seen that the front wheel 9 or the rear wheel 6 is equipped with a hub motor, and a pedal and battery 7 are installed at the bottom of the main frame 4. Of course, it can be imagined that the bicycle can also be an ordinary bicycle.
[0023] Please refer to Figure 2 and Figure 3 , it can be seen that:
[0024] The rear frame 3 includes a support chassis, the support chassis is installed on the rear support seat 1 and a front-back adjustment mechanism is provided between the support chassis and the rear support seat 1, so that the rear frame 3 can be displaced back and forth.
[0025] In this embodiment, the supporting chassis includes a horizontal base plate 3-3. At the bottom of the base plate 3-3, there are two left and right supporting vertical plates 3-1 installed. The two supporting vertical plates 3-1 are respectively located on both sides of the rear supporting seat 1 and are fixedly connected to the rear supporting seat 1 by a front and rear adjustment mechanism.
[0026] In this embodiment, the front and rear adjustment mechanism includes adjustment mounting holes 2 provided on both sides of the rear supporting seat 1. The adjustment mounting holes 2 are threaded holes. At the front and rear of the supporting vertical plate 3-1, there are adjustment screws 3-2 with rotating ends at the outer ends. The inner ends of the adjustment screws 3-2 are located in the adjustment mounting holes 2. When it is necessary to adjust the front and rear positions of the rear frame 3, rotate the adjustment screws 3-2 to release the connection with the rear supporting seat 1, move forward or backward, and then screw the adjustment screws 3-2 into the adjustment mounting holes 2 at other positions again.
[0027] On the supporting chassis, there are two left and right groups of laterally movable translation supports 3-4 (two on the left and two on the right). On the two groups of translation supports 3-4, there is a group of left sleeves 3-5 and a group of right sleeves 3-6 installed. The left sleeves 3-5 have two front and rear ones, and the right sleeves 3-6 have two front and rear ones, and each of the left sleeves 3-5 and the right sleeves 3-6 is arranged in parallel.
[0028] On the inner side of the translation support 3-4, there are chutes. The front edge and the rear edge of the base plate 3-3 are respectively located in the chutes of the front translation support 3-4 and the rear translation support 3-4, forming a left and right adjustment mechanism. Further, a locking and fixing mechanism is provided between the translation support 3-4 and the base plate 3-3.
[0029] The combination composed of two left and right groups of translation supports 3-4, the left sleeves 3-5 and the right sleeves 3-6 can move left and right. The front edge and the rear edge of the base plate 3-3 serve as the slide rails when the translation supports 3-4 move laterally. The locking and fixing mechanism can be a locking screw. A threaded hole is provided at the bottom of the translation support 3-4 that penetrates upward to the chute. The locking screw is located in the threaded hole and its upper end contacts the bottom surface of the base plate 3-3. When it is necessary to adjust the left and right displacement, loosen each locking screw and re-tighten each locking screw after moving into place.
[0030] The left end of the left sleeve 3-5 is open, and the left telescopic rod 3-7 is inserted inside it. The right end of the right sleeve 3-6 is open, and the right telescopic rod 3-8 is inserted inside it. Therefore, the left telescopic rod 3-7 can perform telescopic movements on the left side, and the right telescopic rod 3-8 can perform telescopic movements on the right side. On the left sleeve 3-5 and the right sleeve 3-6, there are two fixed bases 3-9, one on the left and the other on the right, and a load-carrying support beam 3-11 is installed on the fixed base 3-9. On the outer ends of the left telescopic rod 3-7 and the right telescopic rod 3-8, there are moving bases 3-10, and a load-carrying support beam 3-11 is installed on the moving base 3-10. Therefore, the positions of the two load-carrying support beams 3-11 in the middle cannot change, and the two load-carrying support beams 3-11 on both sides can move left and right. In this way, the width dimension of the rear frame 3 can be adjusted and set to meet the needs of carrying and fixing items of different sizes.
[0031] In this embodiment, the left sleeve 3-5 and the right sleeve 3-6 are both welded and fixed to the left and right groups of translation supports 3-4. The fixed base 3-9 is welded and fixed to the left sleeve 3-5 and the right sleeve 3-6. The moving base 3-10 is welded and fixed to the outer ends of the left telescopic rod 3-7 and the right telescopic rod 3-8.
[0032] In this embodiment, a locking and fixing mechanism for the left telescopic rod 3-7 is provided on the side wall of the left sleeve 3-5, and a locking and fixing mechanism for the right telescopic rod 3-8 is provided on the side wall of the right sleeve 3-6. The locking and fixing mechanisms are both locking screws. Radially penetrating threaded holes are provided on the side walls of the left sleeve 3-5 and the right sleeve 3-6. The locking screws are located in the threaded holes, and the inner ends are in contact with the telescopic rods. When telescopic adjustment is required, loosen each locking screw and then re-tighten each locking screw after the telescopic adjustment is in place.
[0033] In this embodiment, the front part of the load-carrying support beam 3-11 is fixedly connected to the fixed base 3-9 and the moving base 3-10 by screws. A plurality of vertically penetrating perforations 3-12 are provided at the rear end of each load-carrying support beam 3-11. The function of providing the perforations 3-12 is to improve the convenience of operating the connection with the binding ropes when loading items.
[0034] Operation method:
[0035] Install and fix the rear frame 3 on the rear support seat 1. Adjust the telescopic length of the telescopic rods in the sleeves according to the size of the item to adapt and adjust the width dimension of the rear frame 3. Place the item on the rear frame 3 and use ropes to bind and fix the item to each load-carrying support beam 3-11. After loading the item onto the rear frame 3, if it is felt that the item affects the balance of the vehicle's center of gravity when riding the bicycle, stop and make appropriate left-right displacement adjustment and appropriate front-back displacement adjustment to the item.
[0036] When the vehicle is not carrying any load, the entire rear frame 3 can be disassembled. The rear seat cushion 10 can be installed or not installed on the rear support seat 1. Installing the rear seat cushion 10 is for carrying passengers and ensuring comfort.
Claims
1. A bicycle with an extensible rear frame, comprising a main frame (4); characterized in that: at The rear part of the main frame (4) is fixedly installed with a rear support base (1), and a rear frame (3) is installed on the rear support base (1); the rear frame (3) includes a support chassis, the support chassis is installed on the rear support base (1), and a front-back adjustment mechanism is provided between the support chassis and the rear support base (1). On the support chassis, two groups of left and right laterally movable translation supports (3-4) are installed. On the two translation supports (3-4), a group of left-side sleeves (3-5) and a group of right-side sleeves (3-6) are installed. The left end of the left-side sleeve (3-5) is open, and a left-side telescopic rod (3-7) is inserted inside. The right end of the right-side sleeve (3-6) is open, and a right-side telescopic rod (3-8) is inserted inside. On the left-side sleeve (3-5) and the right-side sleeve (3-6), two left and right fixed bases (3-9) are fixedly installed, and a load-carrying support beam (3-11) is installed on the fixed base (3-9). At the outer ends of the left-side telescopic rod (3-7) and the right-side telescopic rod (3-8), a moving base (3-10) is installed, and a load-carrying support beam (3-11) is installed on the moving base (3-10).
2. The bicycle with an extensible rear frame as claimed in claim 1, wherein: The support chassis includes a horizontal base plate (3-3). On the bottom of the base plate (3-3), two left and right support vertical plates (3-1) are installed. The two support vertical plates (3-1) are respectively located on both sides of the rear support base (1) and are fixedly connected to the rear support base (1) by a front-back adjustment mechanism.
3. The bicycle with an expandable rear frame as claimed in claim 2, wherein: The front-back adjustment mechanism includes adjustment mounting holes (2) provided on both sides of the rear support base (1). The adjustment mounting holes (2) are threaded holes. At the front and rear of the support vertical plate (3-1), adjustment screws (3-2) with rotary ends at the outer ends are provided. The inner ends of the adjustment screws (3-2) are located in the adjustment mounting holes (2).
4. The bicycle with an extensible rear frame as claimed in claim 3, characterized in that: translation Chutes are provided on the inner sides of the supports (3-4). The front edge and the rear edge of the base plate (3-3) are respectively located in the chutes of the front translation support (3-4) and the rear translation support (3-4), forming a left-right adjustment mechanism.
5. The bicycle with an expandable rear frame as claimed in claim 4, wherein: The left-side sleeve (3-5) and the right-side sleeve (3-6) are both welded and fixed to the left and right groups of translation supports (3-4). The fixed base (3-9) is welded and fixed to the left-side sleeve (3-5) and the right-side sleeve (3-6). The moving base (3-10) is welded and fixed to the outer ends of the left-side telescopic rod (3-7) and the right-side telescopic rod (3-8).
6. The bicycle with an extensible rear frame as claimed in claim 5, wherein: A locking and fixing mechanism is provided between the translation support (3-4) and the base plate (3-3). A locking and fixing mechanism for the left-side telescopic rod (3-7) is provided on the side wall of the left-side sleeve (3-5). A locking and fixing mechanism for the right-side telescopic rod (3-8) is provided on the side wall of the right-side sleeve (3-6).
7. The bicycle with an expandable rear frame as claimed in claim 6, characterized in that: The front part of the load-carrying support beam (3-11) is fixedly connected to the fixed base (3-9) and the moving base (3-10) by screws. At the rear end of each load-carrying support beam (3-11), a plurality of vertically penetrating perforations (3-12) are provided.