Combination structure of bicycle handlebars and auxiliary handlebars

Abstract

A combination structure of bicycle handlebars and auxiliary handlebars includes a positioning seat on each side near the center of the handlebar. Above each positioning seat, a base, a bracket, and an auxiliary handlebar are sequentially arranged. The positioning seat of the handlebar has two through holes. The base, located on the top surface of the positioning seat, also has through holes corresponding to the two through holes on the positioning seat. Its top surface has an arc-shaped recess with a perfect circle. One side of the bracket has a fitting hole for a fitting section to be fitted onto the rear end of the auxiliary handlebar. An extension seat extends outwards and backwards from the outer side of the fitting section. An adjustment seat is located downwards between the fitting section and the extension seat. The bottom surface of the adjustment seat has an arc-shaped protrusion with a perfect circle. The base has an arc-shaped recess on its top surface that fits into the base. The bottom section of the adjustment seat has two long slots opposite to the two through holes on the base. Inserting holes are provided from one side of the adjustment seat into the two long slots, so that each inserting hole is used to insert a locking pin with a locking hole. Finally, two angle adjustment bolts are inserted from the bottom of the two through holes on the handle, through the two through holes on the base, and into the two long slots in the adjustment seat of the bracket. They are locked with the locking holes on the two locking pins. By using the two angle adjustment bolts to tighten and loosen the two locking pins in the adjustment seat of the bracket, the bracket is driven to change angle. This, in turn, drives the rear end through the auxiliary handle fixed to the bracket to adjust the angle.

Description

Technical Field

[0001] This invention relates to the technical field of bicycles, and more particularly to the combined structure of bicycle handlebars and auxiliary handlebars. Prior Technology

[0002] When bicycles are used for racing, a pair of auxiliary handlebars are usually installed on the handlebars, and an extension seat is set on each auxiliary handlebar. A guard is fixed on the extension seat. The auxiliary handlebars allow the rider to adjust the riding posture. For example, the guard can provide temporary support for the forearm, resulting in a comfortable riding effect.

[0003] For example, in the utility model patent application M554441 entitled "Adjustable Angle Structure for Auxiliary Handlebars for Bicycles," as described in claim 11 and shown in Figures 21 to 25, it comprises: an auxiliary handlebar, one end of which is detachably fixed to an extension seat, and an overlay extending from the extension seat to one side, the overlay having a through hole; and a corresponding fixing seat for the auxiliary handlebar, the fixing seat being for fixing to both sides of one end of the bicycle seat tube, the fixing seat having a horizontal through-hole. A central hole is provided, and an elongated assembly hole communicating with the central hole is cut on the top side. A locking pin is placed in the central hole. The extension seat is attached to the top side of the fixed seat with the overlay. A bolt is aligned with the through hole and the assembly hole and extends into the fixed seat to fasten the locking pin, thereby controlling whether the overlay can be pressed against or loosened on the fixed seat. In the loosened state, the auxiliary handle can be turned, and the extension seat and the locking pin swing along the assembly hole range to adjust the angle of the auxiliary handle swinging in the vertical direction.

[0004] While the aforementioned structure can achieve the effect of adjusting the angle of the auxiliary handlebars in the up-and-down direction, firstly, because the extension seat fixed to one end of the auxiliary handlebars needs to be equipped with a support for the cyclist's arms during riding, the rider's arms will exert pressure on the extension seat during riding; secondly, the structure for adjusting the angle of the auxiliary handlebars simply uses a covered edge extending from one side of the extended seat, with a through hole in the covered edge, and then a corresponding fixing seat for the auxiliary handlebars. For fixing to both sides of one end of a bicycle seat tube, the mounting base has a horizontally penetrating central hole, and an elongated assembly hole communicating with the central hole is cut on the top side. A locking pin is installed in the central hole. The extension base, with its overlay, rests against the top side of the mounting base. A bolt is aligned with the through hole and the assembly hole and extends into the mounting base to secure the locking pin, thereby controlling whether the overlay can be pressed against or released from the mounting base. In the loosened state, by turning the auxiliary handle, the extension base and the locking pin swing along the assembly hole, thereby adjusting the vertical movement of the auxiliary handle. The angle of directional swing; therefore, when a cyclist rests their arms on the guard seat during riding, the following pressure is applied to the side of the extended seat guard seat, forming a cantilevered downward pressure. This cantilevered downward pressure must be borne by the extended seat and the auxiliary handlebars. This results in the guard seat being held in place by the overlay against the top side of the fixed seat, and a single bolt being inserted into the fixed seat by aligning with the through hole and the assembly hole on the overlay, and tightening the locking pin to control whether the overlay can be pressed against or released. The structure of the fixed seat, which allows the auxiliary handle to be moved in the loosened state, along with the extension seat and the locking pin, to swing along the assembly hole range to adjust the swing angle of the auxiliary handle in the vertical direction, is problematic during riding. The bolt must fully bear the force of the arm cantilevered downward pressure from the guard seat on the other side of the extension seat, which may cause the radial bending of the auxiliary handle along the overlay to occur. It may even cause wobbling between the through hole on the overlay and the bolt, thus preventing effective angle adjustment of the entire auxiliary handle. This design needs improvement. Summary of the Invention

[0005] Therefore, the inventor of this invention actively sought solutions based on his experience in manufacturing bicycle components, which led to the creation of the "combination structure of bicycle handlebars and auxiliary handlebars".

[0006] To achieve this objective, the main purpose is to provide a combined structure of a bicycle handlebar and an auxiliary handlebar. This structure comprises a positioning seat on each side near the center of the handlebar. Above each positioning seat, a base, a bracket, and an auxiliary handlebar are sequentially arranged. The positioning seat of the handlebar has two through holes. The base, located on the top surface of the positioning seat, also has through holes corresponding to the two through holes on the positioning seat. Its top surface has an arc-shaped recess with a perfect circle. One side of the bracket has a fitting hole for a fitting section to be fitted onto the rear end of the auxiliary handlebar. An extension seat extends outwards and backwards along the outer side of the fitting section. An adjustment seat is positioned downwards between the fitting section and the extension seat. The bottom surface of the adjustment seat has a... The circular, arc-shaped convex part fits into the arc-shaped concave part on the top surface of the base. The bottom section of the adjusting seat has two long slots opposite to the two through holes on the base. Inserting holes are provided from one side of the adjusting seat into the two long slots, so that each inserting hole is used to insert a locking pin with a locking hole. Finally, two angle adjusting bolts are inserted from the bottom of the two through holes on the handle, through the two through holes on the base, into the two long slots in the adjusting seat of the bracket, and locked with the locking holes on the two locking pins. By using the two angle adjusting bolts to tighten and loosen the two locking pins in the adjusting seat of the bracket, the bracket is driven to change angle, which in turn drives the auxiliary handle attached to the bracket to adjust the angle.

[0007] A secondary objective of this invention is to provide a combined structure of bicycle handlebars and auxiliary handlebars. The base has an arc-shaped recess with a circular arc on its top surface, and the adjustment seat of the bracket also has an arc-shaped protrusion with a circular arc on its bottom surface. Furthermore, the extension seat of the bracket extends outwards and then rearwards from the outer side of the sleeve section. Therefore, the invention provides two brackets that can be combined with the two auxiliary handlebars. When combined with the base, the bracket originally attached to the left side of the handlebar can be rotated 180 degrees clockwise to mate with the base originally attached to the right side of the handlebar; the bracket originally attached to the right side of the bicycle handlebar can be rotated 180 degrees counterclockwise to mate with the base originally attached to the left side of the handlebar. Finally, the... The original two angle adjustment bolts are inserted into the bottom of the two front-to-back through holes in the positioning seat of the handle, through the two through holes in the base, and into the two front-to-back elongated slots in the adjustment seat of the bracket. They are then locked with the locking holes on the two locking pins, thus assembling the bracket and base onto the positioning seat of the handle. This ensures that even if the two brackets are rotated 180 degrees clockwise and counterclockwise respectively and swapped left and right, the protective seat can still be locked onto the top surface of the extension seat of the bracket, and the auxiliary handle can be fixed onto the bracket. By using the two angle adjustment bolts to perform alternating tightening and loosening operations on the two locking pins in the adjustment seat of the bracket, the bracket is driven to change angle, which in turn drives the auxiliary handle attached to the bracket to adjust its angle.

[0008] Another objective of this invention is to provide a combined structure of bicycle handlebars and auxiliary handlebars. This structure only requires rotating the two supports 180 degrees clockwise and counterclockwise respectively, and swapping their left and right sides. This allows the guard seat to be locked to the top surface of the extension seat of the support. After the auxiliary handlebars are combined with the support, when the guard seat, mounted on the top surface of the extension seat, is adjusted forward and backward, the distance to the front end of the auxiliary handlebar, measured from the rear end of the base to the front end, is increased compared to when the support is not rotated 180 degrees clockwise and counterclockwise or swapped left and right. Therefore, it allows bicycle riders to adjust the combination of the guard seat and the front end of the auxiliary handlebars according to their arm length and arm support habits, increasing the distance and range of flexible adjustment between them. Simple Explanation of the Diagram

[0009]

[0010] Figure 1: A three-dimensional exploded and assembled schematic diagram of the first embodiment of the structure of the present invention.

[0011] Figure 2: A three-dimensional view of the support structure in Figure 1 from another angle (view from below).

[0012] Figure 3: A schematic diagram of the three-dimensional disassembly and reassembly of a partial component section from Figure 1.

[0013] Figure 4: A three-dimensional exploded and assembled schematic diagram of another aspect of the first embodiment of the structure of the present invention (viewed from below).

[0014] Figure 5: A partial three-dimensional combined appearance diagram of the first embodiment of the structure of the present invention.

[0015] Figure 6: A three-dimensional combined appearance diagram of the first embodiment of the structure of the present invention.

[0016] Figure 7: A schematic diagram of the first embodiment of the structure of the present invention (left side, with the rear end of the auxiliary handle in a horizontal state).

[0017] Figure 8: A schematic cross-sectional view of the first embodiment of the structure of the present invention (left side, with the rear end of the auxiliary handle in a horizontal state).

[0018] Figure 9: A schematic diagram of the first embodiment of the structure of the present invention (left side, with the auxiliary handle tilted upwards).

[0019] Figure 10: A schematic cross-sectional view of the first embodiment of the structure of the present invention (left side, with the auxiliary handle tilted upwards).

[0020] Figure 11: A partial three-dimensional combined appearance diagram of the second embodiment of the structure of the present invention.

[0021] Figure 12: A three-dimensional combined appearance diagram of the second embodiment of the structure of the present invention.

[0022] Figure 13: A schematic diagram of the second embodiment of the structure of the present invention (left side, with the rear end of the auxiliary handle in a horizontal state).

[0023] Figure 14: A schematic cross-sectional view of the second embodiment of the structure of the present invention (left side, with the rear end of the auxiliary handle in a horizontal state).

[0024] Figure 15: A schematic diagram of the second embodiment of the structure of the present invention (left side, with the auxiliary handle tilted upwards).

[0025] Figure 16: A schematic cross-sectional view of the second embodiment of the structure of the present invention (left side, with the auxiliary handle tilted upwards).

[0026] Figure 17: A comparison diagram between Figure 7 and Figure 13. Implementation

[0027] The remaining structural features and operational aspects of this case will be described below in conjunction with the accompanying diagrams for review and reference.

[0028] Please refer to Figures 1 through 10. The first embodiment of the combined structure of the bicycle handlebar and auxiliary handlebars of the present invention includes: a handlebar 2, two bases 3, two brackets 4, and two auxiliary handlebars 5; wherein,

[0029] The handle 2 has a positioning seat 21 on its left and right sides near the center. Each positioning seat 21 has two through holes 211 arranged in front and behind to serve as adjustment space.

[0030] The two bases 3 are generally trapezoidal (as shown in Figure 7 and Figure 9). They are positioned on the top surface of the positioning seat 21 of the handle 2. Corresponding to the two through holes 211 provided on the positioning seat 21 of the handle 2, two through holes 31 are also provided to provide adjustment space and are arranged in a front-to-back manner. The top surface is provided with an arc-shaped recess 32 with a perfect circle as the arc.

[0031] Each of the two supports 4 includes: a fitting section 41, an extension seat 42, and an adjustment seat 43. The fitting section 41 is axially provided with fitting holes 411. The extension seat 42 extends outward from the outer side of the fitting section 41 and then rearward. Several parallel locking holes 421 are provided on the extension seat 42. The top surface of the extension seat 42 is provided with a protective seat 422 for arm support. The protective seat 422 is provided with several parallel connecting holes 4221, which correspond to the parallel locking holes 421 on the extension seat 42. Bolts 423 pass through the connecting holes 4221 and the locking holes 421 to lock the protective seat 422, thus fixing the protective seat 422 to the top surface of the extension seat 42. The connecting holes 4221 on the protective seat 422 are used to secure it. 221 can be aligned with the locking holes 421 located on the extension seat 42 at different positions. When locked with bolts 423, the protective seat 422 can be adjusted to move forward and backward or left and right on the top surface of the extension seat 42. An adjustment seat 43 is provided downward between the bracket 4-position sleeve section 41 and the extension seat 42. The bottom surface of the adjustment seat 43 is provided with an arc-shaped protrusion 431 with a perfect circle arc, so as to make a concave-convex fit with the arc-shaped concave portion 32 provided on the top surface of the base 3. The bottom section of the adjustment seat 43 is also provided with two elongated slots 432 arranged in a front-back manner opposite to the two through holes 31 provided on the base 3. From one side of the adjustment seat 43 towards the two elongated slots 432... A recessed hole 433 is provided in the rear-mounted long slot 432, so that each recessed hole 433 provides a locking pin 434 with a locking hole 4341 for recessing and positioning. Each locking pin 434 is positioned around the recessed hole 433 and fitted with an elastic washer 4342. Finally, two angle adjusting bolts 435 are inserted from the bottom end of the two front-to-back through holes 211 provided in the handle 2, through the corresponding through holes 31 provided in the base 3, and into the two front-to-back long slots 432 provided in the adjusting seat 43 of the bracket 4, and locked with the locking holes 4341 on the two locking pins 434.

[0032] The two auxiliary handles 5 have a rear end 51 at one end and an upwardly extending front end 52 at the other end. The rear end 51 passes through the sleeve hole 411 provided in the sleeve section 41 of the bracket 4 and is combined with the bracket 4. The upwardly extending front end 52 provides a grip for the rider's hands.

[0033] With the above-described structure, when the auxiliary handle 5 needs to be adjusted in angle, as shown in Figures 7 and 8, taking the rear end of the auxiliary handle 5 as a horizontal state as an example, the two angle adjusting bolts 435 are parallel to each other. When the two locking pins 434, which are embedded in the two holes 433 of the adjusting seat 43, are engaged with the locking holes 4341 on the two locking pins 434, the two locking pins 434 are horizontal. Referring to Figures 9 and 10, when the auxiliary handle 5 is to be adjusted to an upward angle, simply tighten the angle adjusting bolt 435 at the rear end along the locking holes 4341 on the corresponding rear locking pin 434, while simultaneously loosening the angle adjusting bolt 435 at the front end. This allows for the adjustment of the auxiliary handle 5 to be adjusted to a similarly horizontal position. The locking pin 434, which is set at the end for locking, moves in one direction and out one direction, causing the bracket 4 to tilt upwards. This allows the auxiliary handle 5 attached to the bracket 4 to be adjusted to tilt upwards. Conversely, if it is desired to adjust the auxiliary handle 5 from its original tilting angle to a downward tilting angle, the angle adjustment bolts 435, which are set at the front and rear, move in the opposite direction. The angle adjustment bolt 435 at the rear end is loosened by spiraling along the locking hole 4341 on the locking pin 434 at the rear end, while the angle adjustment bolt 435 at the front end is tightened by spiraling. This movement of the locking pin 434, which is also set at the front and rear ends for locking, causes the bracket 4 to tilt downwards. This allows the auxiliary handle 5 attached to the bracket 4 to be adjusted to tilt downwards, providing the auxiliary handle 5 with an angle adjustment function.

[0034] Please refer to Figures 1 to 6 and Figures 11 to 16. Figures 11 to 16 show the second embodiment of the combined structure of the bicycle handlebar and auxiliary handlebar of the present invention, which still includes: a handlebar 2, two bases 3, two brackets 4, and two auxiliary handlebars 5. The difference from the first embodiment is that the top surface of the base 3 of the present invention is provided with an arc-shaped concave portion 32 with a perfect circle curvature, and the bottom surface of the adjustment seat 43 of the bracket 4 is provided with an arc-shaped protrusion 431 with a perfect circle curvature. In addition, the extension seat 42 of the bracket 4 extends outward from the outside of the sleeve section 41 and then to the rear end. Therefore, when the two brackets 4 that are combined with the two auxiliary handlebars 5 are to be combined with the base 3, the bracket 4 that was originally combined with the base 3 near the center left of the handlebar 2 in the first embodiment can be rotated 180 degrees clockwise to be combined with the base 3 that was originally in the same position as the base 3 near the center right of the handlebar 2 in the first embodiment. In the first embodiment, the bracket 4, which was originally combined with the base 3 located near the center right of the handle 2, is rotated 180 degrees counterclockwise and then combined with the base 3 located near the center left of the handle 2 in the first embodiment (see Figures 5 and 11 for reference). Finally, the original two angle adjustment bolts 435 are inserted from the bottom of the two through holes 211 arranged front and back on the handle 2, through the two through holes 31 on the base 3, and into the two long slots 432 in the adjustment seat 43 of the bracket 4. They are locked with the locking holes 4341 on the two locking pins 434, and the bracket 4 and base 3 are combined on the positioning seat 21 of the handle 2. This ensures that even if the two brackets 4 are rotated 180 degrees clockwise and counterclockwise respectively, and the left and right sides are reversed, the protective seat 422 can still be locked to the top surface of the extension seat 42 of the bracket 4. The rear end 51 of the auxiliary handle 5 passes through the sleeve hole 411 fixed to the sleeve section 41 of the bracket 4 and is combined with the bracket 4.

[0035] With the above-described structure, when the auxiliary handle 5 needs to be angled, as shown in Figures 13 and 14, taking the initial horizontal assembly of the auxiliary handle 5 as an example, the two angle adjustment bolts 435 are parallel to each other. They engage with the two locking pins 434 embedded in the two mounting holes 433 of the adjustment seat 43, so that when the locking holes 4341 on the two locking pins 434 are locked with the two angle adjustment bolts 435, the two locking pins 434 are horizontal. Similarly, as shown in Figures 15 and 16, when the auxiliary handle 5 is to be adjusted to an upward angle, the angle adjustment bolt 435 at the rear end is tightened by spiraling along the locking holes 4341 on the corresponding rear locking pin 434, while the angle adjustment bolt 435 at the front end is loosened by spiraling. This creates an inward and outward movement of the locking pins 434, which are locked in a front-to-back configuration, causing the bracket 4 to move upward. The upward angle allows the auxiliary handle 5 attached to the bracket 4 to be adjusted to an upward angle as well. Conversely, if the auxiliary handle 5 is to be adjusted from an upward angle to a downward angle, the angle adjustment bolts 435, which are set at the front and rear, are in the opposite direction to the above. The angle adjustment bolt 435 at the rear end is loosened by spiraling along the locking hole 4341 on the locking post 434 at the opposite rear end, while the angle adjustment bolt 435 at the front end is tightened by spiraling. In this way, the locking post 434, which is locked at the front and rear ends, is pulled back and forward, which drives the bracket 4 to a downward angle. This allows the auxiliary handle 5 attached to the bracket 4 to be adjusted to a downward angle, providing the angle adjustment effect of the auxiliary handle 5.

[0036] Furthermore, please refer to Figure 17, which is a comparative diagram of Figures 7 and 13. Viewed from the rear end of the base 3 fixed to the handle 2 as a reference point, this invention only requires rotating the two supports 4 180 degrees clockwise and counterclockwise respectively, and swapping their left and right sides. This provides a way to lock the protective seat 422 onto the top surface of the extension seat 42 of the support 4. The rear end 51 of the auxiliary handle 5 passes through the fitting hole 411 provided in the fitting section 41 fixed to the support 4. After being combined with the support 4, the top surface of the extension seat 42 provides a protective seat 422 for arm support. A bolt 423 passes through the protective seat 422. The upper connecting hole 4221 is locked with the locking hole 421 on the extension seat 42, providing that when the guard seat 422 is adjusted back and forth or left and right on the top surface of the extension seat 42, the distance that the guard seat 422 can be adjusted to toward the front end 52 of the auxiliary handle 5 is a distance B longer than that of the first embodiment where the guard seat 422 is adjusted to a distance A toward the front end of the auxiliary handle 5. This provides an increased distance for the guard seat 422 to be closer to the front end 52 of the auxiliary handle 5. Furthermore, the distance from the rear end 51 of the auxiliary handle 5 to its front end 52 is also based on the rear end of the base 3 fixed to the handle 2. Alternatively, compared to the first embodiment, the distance C from the rear end 51 of the auxiliary handlebar 5, fixed to the rear end of the base 3 of the handlebar 2, to the front end 52 can be extended by a distance D. This allows the cyclist to lean forward more to reduce wind resistance, and the extra distance D allows their hands to grip the handlebar 5 at a position closer to the front end 52. Accordingly, the cyclist can adjust the distance and range of elastic adjustment between the guardrail 422 and the front end 52 of the auxiliary handlebar 5 according to their arm length and arm support habits.

[0037] The above-described embodiments are for illustrative purposes only and are not intended to limit the invention. Therefore, any changes in numerical values ​​or substitutions of equivalent elements should still fall within the scope of this invention.

[0038] The above detailed description should make it clear to those skilled in the art that the present invention can indeed achieve the aforementioned objectives and complies with the provisions of the Patent Law; therefore, a patent application is hereby filed.

[0039]

[0040] (2): Handle

[0041] (21): Positioning seat

[0042] (211): Perforation

[0043] (3): Base

[0044] (31): Perforation

[0045] (32): Arc-shaped concave part

[0046] (4): Stent

[0047] (41): Nested segment

[0048] (411): Sleeve hole

[0049] (42): Extension seat

[0050] (421): Keyhole

[0051] (422): Protective seat

[0052] (4221): Connecting hole

[0053] (423): Bolt

[0054] (43): Adjustment seat

[0055] (431): Arc-shaped protrusion

[0056] (432): Long slot hole

[0057] (433): Embedded Hole

[0058] (4341): Keyhole

[0059] (4342): Elastic washer

[0060] (434): Locking Pillar

[0061] (435): Angle Adjustment Bolt

[0062] (5): Auxiliary handle

[0063] (51): Backend

[0064] (52): Frontend

[0065] (A): Distance

[0066] (B): Distance

[0067] (C): Distance

[0068] (D): Distance

Claims

1. A combination structure of bicycle handlebars and auxiliary handlebars, comprising: One handle, two bases, two supports, and two auxiliary handles; wherein, the handle has a positioning seat on each of its left and right sides near the center, and each positioning seat has two through holes arranged front and back; each of the two bases is positioned on the top surface of the positioning seat of the handle, and each base also has a through hole arranged front and back corresponding to the two through holes of the positioning seat of the handle, and its top surface has an arc-shaped concave part with a perfect circle as the arc. Each of the two brackets includes: a sleeve section, an extension seat, and an adjustment seat. The sleeve section has an axially arranged sleeve hole. The extension seat extends from the outside of the sleeve section and has a protective seat on its top surface. An adjustment seat is provided downward between the sleeve section and the extension seat. The bottom surface of the adjustment seat has an arc-shaped protrusion with a perfect circle radius to fit with an arc-shaped concave part on the top surface of the base. The bottom section of the adjustment seat has two elongated slots arranged front to back, opposite to the two through holes on the base. An inserting hole is provided from one side of the adjustment seat into the two elongated slots arranged front to back, so that a locking pin with a locking hole is inserted and positioned in each inserting hole. Finally, two angle adjusting bolts are inserted from the bottom end of the two through holes arranged front to back on the positioning seat of the handle, through the two through holes on the base, into the two elongated slots arranged front to back in the adjustment seat of the bracket, and locked with the locking holes on the two locking pins. The two auxiliary handles have one end as the rear end and the other end as the front end that extends upwards at an angle. The rear end passes through the sleeve hole provided in the sleeve section fixed to the bracket and is then connected to the bracket.

2. The combination structure of bicycle handlebars and auxiliary handlebars as described in claim 1, wherein the extension seat of the bracket extends outward and then rearward from the outside of the sleeve section.

3. The combination structure of the bicycle handlebars and auxiliary handlebars as described in claim 1, wherein, The base is roughly trapezoidal in shape.

4. The combination structure of the bicycle handlebars and auxiliary handlebars as described in claim 1, wherein, Each locking pin and the area around the insertion hole is fitted with an elastic washer.

5. The combination structure of the bicycle handlebars and auxiliary handlebars as described in claim 1, wherein, The extension base of the bracket is provided with several parallel locking holes, and the protective base is also provided with several parallel connecting holes, so that the connecting holes correspond to the several parallel locking holes provided on the extension base. The protective base is fixed to the top surface of the extension base by bolts passing through the connecting holes and locking holes.

6. The combination structure of the bicycle handlebars and auxiliary handlebars as described in claim 5, wherein, The mating hole on the guard can be aligned with the locking hole on the extension seat at different positions, so that when the guard is locked with bolts, it can be adjusted to move back and forth or left and right on the top surface of the extension seat.

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