Seat frame for bicycle

Abstract

The utility model provides a seat frame for a bicycle, and belongs to the technical field of bicycle accessories. The bicycle seat frame solves the problems that in the prior art, a bicycle seat frame is troublesome in installation and replacement operation and single in structure function. The seat frame for the bicycle comprises a connecting seat with a clamping groove and a supporting frame detachably arranged on the connecting seat, a fastening sleeve is detachably arranged in the clamping groove, the fastening sleeve is provided with an opening seam formed in the axial direction, and the two ends of the opening seam extend to the two ends of the fastening sleeve respectively. Fastening bolts for connecting the clamping groove and the clamping groove are arranged on the groove walls on the two sides of the notch of the clamping groove in a penetrating mode. The bicycle seat frame has the advantages of being capable of improving the convenience of disassembly and assembly of the bicycle seat frame and diversification of using functions.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycle accessories and relates to a bicycle seat frame. Background Art

[0002] Bicycles, also known as bicycles or bikes, are usually two-wheeled small land vehicles. People ride on the bicycles and use pedals as power. It is a green and environmentally friendly means of transportation. The rear seat of a bicycle can be used to carry goods or people to facilitate people's travel. The traditional rear seat of a bicycle is fixed to the frame and the rear fork of the frame under the seat by bolts. It is not only troublesome to install and replace, but also it is impossible to directly install and fix the child seat. The structure and function are relatively simple. Summary of the invention

[0003] The purpose of the utility model is to solve the above problems in the existing technology and propose a bicycle seat frame. The technical problem to be solved by the utility model is how to improve the convenience of disassembly and assembly of the bicycle seat frame while realizing the diversification of the use functions.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A bicycle seat frame, characterized in that it includes a connecting seat with a clamping groove and a support frame detachably arranged on the connecting seat, wherein a fastening sleeve is detachably arranged in the clamping groove, the fastening sleeve has an open slot arranged along the axial direction, and the two ends of the open slot respectively extend to the two ends of the fastening sleeve, and the groove walls on both sides of the notch of the clamping groove are penetrated with fastening bolts connecting the two.

[0006] The bicycle seat frame is connected to the bicycle seat tube by the cooperation of a connecting seat with a clamping groove, a fastening sleeve and a fastening bolt. When in use, the connecting seat is connected to the bicycle seat tube. The use of the fastening sleeve can reduce the processing accuracy requirements of the clamping groove and the bicycle seat tube. At the same time, the reliability of the connection between the connecting seat and the bicycle seat tube can be improved by wrapping and clamping the bicycle seat tube with the fastening sleeve. In addition, the fastening sleeve is provided with an opening slot, so that the fastening sleeve can be directly clamped into and sleeved on the bicycle seat tube from the side wall of the bicycle seat tube through the opening slot without removing the bicycle seat cushion. The setting of the clamping groove of the connecting seat enables the connecting seat to be clamped into and sleeved on the bicycle seat tube provided with the fastening sleeve from the side wall of the bicycle seat tube, thereby realizing quick disassembly and assembly between the bicycle seat frame and the bicycle, thereby improving the convenience of disassembly and assembly of the bicycle seat frame; at the same time, the support frame is detachably arranged on the connecting seat, and the installation of accessories such as child seats and tail boxes can be realized by replacing support frames of different shapes, thereby realizing diversified use functions.

[0007] In the above-mentioned bicycle seat frame, the connection seat is also provided with plug-in holes at the positions on both sides of the clamping groove, and the two ends of the support frame are respectively inserted into the plug-in holes, and the end of the support frame has a positioning hole opened in the radial direction, and a movable positioning pin is penetrated through the hole wall of the plug-in hole along the radial direction of the connection seat, the inner end of the positioning pin is inserted into the positioning hole, and the outer end of the positioning pin is extended out of the connection seat, and a spring for moving and resetting the positioning pin is provided on the positioning pin. The above-mentioned structure makes it convenient to disassemble and assemble the support frame and the connection seat.

[0008] In the above-mentioned bicycle seat frame, the spring is sleeved on the positioning pin, and the connecting seat has a cylindrical mounting portion arranged along the radial direction of the connecting seat at the positioning hole, and a cap is detachably provided on the mounting portion. The positioning pin is arranged in the mounting portion, and the outer end of the positioning pin extends out of the cap and a pull ring is provided at the extended portion. The spring is sleeved on the positioning pin, and the end of the spring close to the positioning hole is fixedly connected to the positioning pin, and the end of the spring away from the positioning hole is fixedly connected to the cap. By providing the structure of the mounting portion and the cap, the assembly of the locating pin, the spring and the connecting seat is more convenient. When unlocking, the user only needs to pull the locating pin through the pull ring to move it radially outward along the connecting seat until the locating pin is disengaged from the locating hole, thereby disengaging the support frame from the connecting seat; when assembling, the user only needs to pull the locating pin through the pull ring to move it radially outward along the connecting seat to disengage from the plug-in hole. After the support frame abuts against the lower end of the plug-in hole, the user releases the pull ring, and under the action of the spring, the locating pin can move radially inward along the connecting seat and enter the locating hole, so that the support frame and the connecting seat are connected and locked, thereby realizing rapid disassembly and assembly of the support frame and the connecting seat, and then by replacing support frames of different shapes to realize the installation of accessories such as child seats and trunks, realizing diversified usage functions.

[0009] In the above bicycle seat frame, the outer side wall of the fastening sleeve opposite to the opening slit has a clearance groove, which is arranged along the axial direction of the fastening sleeve, and the two ends of the clearance groove extend to the two ends of the fastening sleeve respectively. The fastening sleeve is inserted into the seat tube through the opening slit. By providing the clearance groove, the fastening sleeve can be better opened to the two sides of the opening slit when inserted into the seat tube, and can be reset after being inserted, which is more convenient to use.

[0010] In the above-mentioned bicycle seat frame, the upper end of the fastening sleeve has a radially arranged edge portion, and the edge portion abuts against the upper end of the connecting seat. The abutment between the edge portion and the connecting seat can prevent the fastening sleeve from moving downward and disengaging from the clamping groove of the connecting seat, thereby improving the reliability of the bicycle seat frame.

[0011] In the above-mentioned bicycle seat frame, the fastening sleeves are provided in multiple numbers and are nested in sequence. By providing multiple fastening sleeves, the versatility of the bicycle seat frame can be improved. Specifically, the diameter of the bicycle seat tube (used to install the bicycle seat cushion) has three common specifications: coarse, medium and thin. The bicycle seat frame is equipped with three fastening sleeves that are nested in sequence. When the diameter of the bicycle seat tube is coarse, only the outermost fastening sleeve needs to be used and the other two fastening sleeves can be removed. When the diameter of the bicycle seat tube is medium, only the two outer fastening sleeves need to be used and the innermost fastening sleeve can be removed. When the diameter of the bicycle seat tube is fine, three fastening sleeves need to be used.

[0012] In the above bicycle seat frame, the opening slit of the outermost fastening sleeve is arranged to face away from the notch of the clamping groove. The fastening sleeve is clamped into the seat tube through the opening slit. By arranging the opening slit of the fastening sleeve to face away from the notch of the clamping groove, the groove wall of the clamping groove can be pressed against the edge of the opening slit, thereby preventing the seat tube from stretching the opening slit, thereby increasing the reliability of the connection between the bicycle seat frame and the bicycle.

[0013] In the above-mentioned bicycle seat frame, the cross-section of the clamping groove includes a straight section arranged near the groove mouth and an arc section arranged near the groove bottom, the straight section and the arc section are connected and the diameter of the arc section is greater than the width of the straight section, the fastening sleeve is arranged in the arc section of the clamping groove, and the fastening bolt is arranged in the straight section of the clamping groove. The shape of the arc section of the clamping groove matches the shape of the fastening sleeve and the bicycle seat tube, while the straight section can better set the bolt. At the same time, the diameter of the arc section is set to be larger than the width of the straight section. Under the extrusion of external force and the seat tube with the fastening sleeve, the two side walls of the straight section can expand outward so that the seat tube with the fastening sleeve enters the arc section from the straight section. After the seat tube with the fastening sleeve leaves, the two side walls of the straight section can be reset. Then, after the nut of the fastening bolt is tightened, the two side walls of the straight section move toward each other so that the width of the straight section can be reduced, and at the same time, the arc section of the clamping groove shrinks inward and clamps the seat tube with the fastening sleeve, thereby ensuring high reliability when the bicycle seat frame is connected to the bicycle.

[0014] Compared with the prior art, the advantages of the bicycle seat frame are: 1. Through the cooperation of the connecting seat with the clamping groove, the fastening sleeve and the fastening bolt, the reliability of the connection between the bicycle seat frame and the bicycle is high, and the bicycle seat frame and the bicycle can be quickly disassembled and assembled, thereby improving the convenience of disassembly and assembly of the bicycle seat frame.

[0015] 2. By arranging structures such as plug holes, pull rings and positioning pins on the connecting seat, the reliability of the connection between the support frame and the connecting seat is high, and the support frame and the connecting seat can be quickly disassembled and assembled, so that by replacing support frames of different shapes to achieve the installation of accessories such as child seats and trunks, thereby realizing diversified use functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the bicycle seat frame.

[0017] Figure 2 It is a schematic structural diagram of the bicycle seat frame when viewed from above.

[0018] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle.

[0019] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0020] Figure 5 This is an exploded view of the bicycle seat.

[0021] Figure 6 This is a three-dimensional structural schematic diagram of the bicycle seat frame fastening sleeve.

[0022] Figure 7 The present invention is a three-dimensional structural schematic diagram of a bicycle seat frame using a plurality of fastening sleeves.

[0023] Figure 8 This is an exploded view of the bicycle seat frame using multiple fastening sleeves.

[0024] Fig. 9 It is a cross-sectional view of the bicycle seat frame connecting seat.

[0025] Fig.10 The utility model is a three-dimensional structural schematic diagram after the bicycle seat frame is installed with a child seat.

[0026] In the figure, 1, connecting seat; 1a, snap-in groove; 1a1, straight section; 1a2, arc section; 1b, plug-in hole; 1c, mounting portion; 2, support frame; 2a, positioning hole; 3, fastening sleeve; 3a, opening seam; 3b, clearance groove; 3c, edge portion; 4, fastening bolt; 5, positioning pin; 6, spring; 7, cap; 8, pull ring. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] A bicycle seat frame, referring to Figure 1-10, including a connecting seat 1 with a clamping groove 1a and a supporting frame 2 detachably arranged on the connecting seat 1, a fastening sleeve 3 is detachably arranged in the clamping groove 1a, the fastening sleeve 3 has an opening slit 3a arranged along the axial direction, and the two ends of the opening slit 3a extend to the two ends of the fastening sleeve 3 respectively, and the groove walls on both sides of the notch of the clamping groove 1a are penetrated with fastening bolts 4 connecting the two.

[0029] Specifically, refer to Figure 1-10 The cross section of the clamping groove 1a includes a straight section 1a1 arranged near the groove mouth and an arc section 1a2 arranged near the groove bottom. The straight section 1a1 and the arc section 1a2 are connected and the diameter of the arc section 1a2 is greater than the width of the straight section 1a1. The fastening sleeve 3 is arranged in the arc section 1a2 of the clamping groove 1a, and the fastening bolt 4 is arranged in the straight section 1a1 of the clamping groove 1a; the connecting seat 1 is also provided with plug holes 1b at positions on both sides of the clamping groove 1a, and the two ends of the support frame 2 are respectively inserted in the plug holes 1b, and the ends of the support frame 2 have positioning holes 2a opened in the radial direction. A movable positioning pin 5 is penetrated on the hole wall of the plug hole 1b along the radial direction of the connecting seat 1, and the inner end of the positioning pin 5 is extended into the positioning hole 2a, and the outer end of the positioning pin 5 is extended out of the connecting seat 1, and a spring 6 for moving and resetting the positioning pin 5 is provided on the positioning pin 5.

[0030] Further, refer to Figure 1-10 The connecting seat 1 has a cylindrical mounting portion 1c arranged radially along the connecting seat 1 at the positioning hole 2a, and a cap 7 is detachably provided on the mounting portion 1c. The positioning pin 5 is arranged in the mounting portion 1c, and the outer end of the positioning pin 5 extends out of the cap 7 and a pull ring 8 is provided at the extended portion. The spring 6 is sleeved on the positioning pin 5, and the end of the spring 6 close to the positioning hole 2a is fixedly connected to the positioning pin 5, and the end of the spring 6 away from the positioning hole 2a is fixedly connected to the cap 7.

[0031] Furthermore, refer to Figure 1-10 The outer side wall of the fastening sleeve 3 opposite to the opening seam 3a has a clearance groove 3b, which is arranged along the axial direction of the fastening sleeve 3, and the two ends of the clearance groove 3b extend to the two ends of the fastening sleeve 3 respectively; the upper end of the fastening sleeve 3 has an edge portion 3c arranged in the radial direction, and the edge portion 3c abuts against the upper end of the connecting seat 1.

[0032] In this embodiment, the fastening sleeves 3 are preferably provided in plurality and are nested in sequence; the opening slit 3a of the outermost fastening sleeve 3 is preferably arranged facing away from the notch of the clamping groove 1a; and the cross section of the clearance groove 3b is preferably V-shaped.

[0033] The working principle of the bicycle seat frame is described below:

[0034] It should be noted that the diameter of the bicycle seat tube (used to install the bicycle seat cushion) is generally of three specifications: coarse, medium and fine. The bicycle seat frame is equipped with three fastening sleeves 3 nested in sequence. When the diameter of the bicycle seat tube is coarse, only the outermost fastening sleeve 3 needs to be used and the other two fastening sleeves 3 can be removed. When the diameter of the bicycle seat tube is medium, only the outer two fastening sleeves 3 need to be used and the innermost fastening sleeve 3 can be removed. When the diameter of the bicycle seat tube is fine, three fastening sleeves 3 need to be used. Using the fastening sleeves 3 can reduce the processing accuracy requirements of the clamping groove 1a and the seat tube, and at the same time improve the reliability of the connection between the connecting seat 1 and the bicycle seat tube.

[0035] When in use, a suitable number of fastening sleeves 3 are sequentially mounted on the seat tube according to the diameter of the seat tube of the bicycle, and the fastening sleeves 3 are sequentially nested. Then, the notch of the clamping groove 1a on the connecting seat 1 is aligned with the fastening sleeve 3 (when multiple fastening sleeves 3 are nested, the fastening sleeve 3 located on the outermost side is aligned), and then the connecting seat 1 is clamped on the fastening sleeve 3 with force (although the diameter of the arc section 1a2 is larger than the width of the straight section 1a1, under the external force and the squeezing action of the seat tube with the fastening sleeve 3, the two side walls of the straight section 1a1 can expand outwards so that the seat tube with the fastening sleeve 3 is connected by the straight section 1a 1 enters the arc section 1a2, and after the seat tube with the fastening sleeve 3 leaves, the two side walls of the straight section 1a1 can be reset). After the fastening sleeve 3 is clamped, it is located in the arc section 1a2 of the clamping groove. Then, the fastening bolt 4 is passed through the groove walls on both sides of the notch of the clamping groove 1a, and the nut of the fastening bolt 4 is tightened, so that the width of the straight section 1a1 is reduced, that is, the two side walls of the straight section 1a1 move toward each other, and the arc section 1a2 of the clamping groove 1a shrinks, so that the connecting seat 1, the fastening sleeve 3 and the bicycle seat tube are connected and locked; when the connecting seat 1 is to be removed from the seat tube, the user can simply perform the reverse operation.

[0036] Then the user simultaneously inserts the two ends of the support frame 2 into the two plug-in holes 1b of the connecting seat 1, and then the user pulls the pull ring 8 to make the positioning pin 5 compress the spring 6 and move radially outward along the connecting seat 1, so that the two ends of the support frame 2 abut against the lower end of the plug-in hole 1b, and then the user releases the pull ring 8, and under the action of the restoring force of the spring 6, the positioning pin 5 moves radially inward along the connecting seat 1 and is inserted into the positioning hole 2a of the support frame 2. At this time, the connecting seat 1 and the support frame 2 are connected and locked. When it is necessary to remove or replace the support frame 2 of other shapes, the user only needs to pull the pull ring 8 to make the positioning pin 5 compress the spring 6 and move radially outward along the connecting seat 1 until the positioning pin 5 disengages from the positioning hole 2a, and then the user moves the support frame 2 upward until both ends of the support frame 2 are disengaged from the plug-in hole 1b.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A bicycle seat frame, characterized in that: The invention comprises a connecting seat (1) having a clamping groove (1a) and a supporting frame (2) detachably arranged on the connecting seat (1); a fastening sleeve (3) is detachably arranged in the clamping groove (1a); the fastening sleeve (3) has an opening slit (3a) arranged along the axial direction, and the two ends of the opening slit (3a) respectively extend to the two ends of the fastening sleeve (3); and fastening bolts (4) connecting the two are penetrated through the groove walls on both sides of the notch of the clamping groove (1a).

2. A bicycle seat frame according to claim 1, characterized in that: The connection seat (1) is also provided with plug holes (1b) at positions on both sides of the clamping groove (1a), and the two ends of the support frame (2) are respectively inserted into the plug holes (1b), and the end of the support frame (2) has a positioning hole (2a) opened in the radial direction, and a movable positioning pin (5) is penetrated on the hole wall of the plug hole (1b) along the radial direction of the connection seat (1), the inner end of the positioning pin (5) is extended into the positioning hole (2a), and the outer end of the positioning pin (5) is extended out of the connection seat (1), and a spring (6) for moving and resetting the positioning pin (5) is provided on the positioning pin (5).

3. A bicycle seat frame according to claim 2, characterized in that: The connection seat (1) has a cylindrical mounting portion (1c) arranged radially along the connection seat (1) at the positioning hole (2a); a cap (7) is detachably arranged on the mounting portion (1c); the positioning pin (5) is arranged in the mounting portion (1c); the outer end of the positioning pin (5) extends out of the cap (7) and a pull ring (8) is arranged at the extended portion; the spring (6) is sleeved on the positioning pin (5); the end of the spring (6) close to the positioning hole (2a) is fixedly connected to the positioning pin (5); and the end of the spring (6) away from the positioning hole (2a) is fixedly connected to the cap (7).

4. A bicycle seat frame according to claim 1, 2 or 3, characterized in that: The outer side wall of the fastening sleeve (3) opposite to the opening slit (3a) has a clearance groove (3b), which is arranged along the axial direction of the fastening sleeve (3), and the two ends of the clearance groove (3b) extend to the two ends of the fastening sleeve (3) respectively.

5. A bicycle seat frame according to claim 4, characterized in that: The upper end of the fastening sleeve (3) has an edge portion (3c) arranged in the radial direction, and the edge portion (3c) abuts against the upper end of the connecting seat (1).

6. A bicycle seat frame according to claim 5, characterized in that: The fastening sleeves (3) are provided in plurality and are nested in sequence.

7. A bicycle seat frame according to claim 6, characterized in that: The opening slit (3a) of the outermost fastening sleeve (3) is arranged to face away from the notch of the clamping groove (1a).

8. The bicycle seat frame according to claim 4, characterized in that: The cross section of the clamping groove (1a) comprises a straight section (1a1) arranged near the groove opening and an arc section (1a2) arranged near the groove bottom; the straight section (1a1) and the arc section (1a2) are connected and the diameter of the arc section (1a2) is greater than the width of the straight section (1a1); the fastening sleeve (3) is arranged on the arc section (1a2) of the clamping groove (1a); and the fastening bolt (4) is arranged on the straight section (1a1) of the clamping groove (1a).

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