TWM618279U - Bicycle pneumatic rod - Google Patents

Abstract

This creation is a bicycle pneumatic rod, which includes a top rod, an outer tube, an inner tube and a slip ring. The top end of the outer tube is an air end, and the bottom end is an oil end, and the oil end is slidably sleeved down outside the ejector rod. The inner tube is fixed in the outer tube and slidably sleeved outside the ejector rod. The slip ring is slidably sleeved outside the inner tube and slidably passed through the outer tube, and the space in the outer tube is divided into an unconnected adjusting oil chamber and an adjusting air chamber. The adjustment air chamber is located above the slip ring, and the adjustment oil chamber is located below the slip ring and communicates with the inner space of the inner pipe. The adjustment oil chamber and the inner tube have hydraulic oil, and the adjustment air chamber has high-pressure gas. Thereby, when the outer tube slides up and down, the volume change of the adjustment air chamber is smaller, so that the thrust of the ejector rod is more linear; in addition, the air pressure of the adjustment air chamber can be lower.

Description

Bicycle air pressure rod

This creation relates to a kind of bicycle components, especially a kind of pneumatic rod used for telescopic seatpost or front fork shock absorber.

Please refer to FIG. 10, the bicycle pneumatic bar in the prior art has a bottom tube 90, a cushion tube 91, a sliding piston 92 and a top rod 93. The seat cushion tube 91 can slide up and down through the bottom tube 90. The sliding piston 92 is slidably arranged in the seat cushion tube 91 up and down, and divides the space in the seat cushion tube 91 into a lower air chamber 911 and an upper oil chamber 912. The air chamber 911 is filled with high-pressure gas, and the oil chamber 912 is Full of hydraulic oil. A bottom pipe 90 is fixed at the bottom end of the top rod 93 and penetrates the air chamber 911 and the sliding piston 92 upwardly and then penetrates into the oil chamber 912. The gas pressure in the air chamber 911 pushes the seat cushion tube 91 upward through the hydraulic oil in the oil chamber 912.

Please refer to FIG. 11, however, the position of the sliding piston 92 will change with the up and down movement of the seat cushion tube 91. The seat cushion tube 91 is fully extended (as shown in FIG. 10) and fully retracted (as shown in FIG. 11). As shown), the sliding piston 92 will produce a large amount of displacement, resulting in a large amount of compression of the volume of the air chamber 911, thereby causing a significant increase in the gas pressure inside the air chamber 911, resulting in a significant increase in the strength of the seat cushion tube 91 with the amount of protrusion Variety. Specifically, when the seat cushion tube 91 is fully retracted, the thrust is too large, but when the seat cushion tube 91 is fully extended, the thrust is insufficient.

In addition, the pressure of the high-pressure gas in the air chamber 911 is relatively high, and professional equipment must be used to inflate, and the user cannot adjust or supplement the air pressure in the air chamber 911 by himself.

Therefore, the prior art bicycle air bar needs to be improved.

In view of the aforementioned shortcomings and deficiencies of the prior art, the present invention provides a bicycle pneumatic rod to make the force of the pneumatic rod more uniform and obtain the same thrust with a lower air pressure.

In order to achieve the above-mentioned creative purpose, the technical means used in this creation is to design a bicycle pneumatic bar, which includes: A jack, which has a shaft; An outer tube is slidably sleeved down outside the ejector rod, the top end of the outer tube is an air end, the bottom end of the outer tube is an oil end, and the oil end is slidably sleeved on the ejector rod The shaft An inner tube located in the outer tube and slidably sleeved outside the ejector rod, the bottom end of the inner tube is fixed with the oil end of the outer tube, and the top end of the inner tube is a closed end; the The inner tube is formed with: At least one oil hole, which penetrates the annular wall of the inner tube and is adjacent to the oil end of the outer tube; A slip ring slidably sleeved on the inner tube and slidably inserted in the outer tube, and the space in the outer tube is divided into an unconnected adjusting air chamber and an adjusting oil chamber The adjustment air chamber is located between the air end of the outer tube and the slip ring, the adjustment oil chamber is located between the slip ring and the oil end of the outer tube, and the adjustment oil chamber uses the at least one oil hole Communicating with the inner space of the inner tube; Wherein, the adjustment oil chamber and the inner space of the inner tube have hydraulic oil; the adjustment air chamber has high pressure gas, and the high pressure gas pushes the outer tube toward the oil end through the hydraulic oil

The advantages of this creation are:

First, by further arranging the inner tube in the outer tube, the slip ring is slidably sleeved on the inner tube, so that the sliding range of the slip ring is limited to the length of the inner tube, even if the slip ring slides to the top of the inner tube, The space between the air end of the outer tube and the closed end of the inner tube can still be reserved for the function of the adjustment air chamber, ensuring that the volume of the adjustment air chamber will not be compressed to a large extent and cause obvious pressure changes. In other words, by slidably sheathing the inner tube with the slip ring, the air volume change of the adjustment air chamber can be made smaller, thereby reducing the thrust change of the outer tube in the state of fully moving down and moving up. The thrust of the pneumatic rod is more linear.

Second, by further arranging the inner tube in the outer tube, only the oil between the inner tube and the piston is stressed when pressure is applied, so that the hydraulic oil volume has the greatest effect in the smallest space, and the overall space is more effectively used (ejector rod The volume can be increased, the volume of hydraulic oil can be reduced, and the air chamber can be enlarged).

Third, the shaft of the ejector rod can be designed to be thicker, so that this creation can obtain the same ejector force with a lower gas pressure, so that the air pressure in the adjustment chamber of this creation can be lower, allowing the user to freely Use a general bicycle pump to adjust the pressure of the air chamber.

Furthermore, in the bicycle pneumatic rod, the jack rod further has: a piston provided at an end of the rod body through which the inner tube is penetrated; the piston divides the inner space of the inner tube into a first oil The first oil chamber is located on the side of the piston opposite to the shaft; the second oil chamber is located between the outer ring surface of the shaft and the inner ring surface of the inner tube; The two oil chambers communicate with the adjusting oil chamber through the at least one oil hole; the bicycle air pressure rod further has: an oil pressure valve arranged on the piston and selectively connects the first oil chamber with the second oil chamber.

Furthermore, in the bicycle pneumatic bar, the jack is formed with: a first channel communicating with the first oil chamber; at least one second channel communicating with the first channel and the second oil chamber; The hydraulic valve includes: a valve core, which is provided in the first passage of the ejector rod, and can move in an opening direction to open the first passage or move in a closing direction to close the first passage; an elastic member, It drives the valve core to move in the closing direction.

Furthermore, the bicycle pneumatic bar further has a control rod which is slidably inserted in the top rod, one end of the control rod protrudes from one end of the top rod exposed to the outer tube, and the other end The spool can be pushed in the opening direction.

Furthermore, the bicycle air pressure bar, wherein the bicycle air pressure bar further has a buffer block, which is foamed plastic; the buffer block is arranged on the inner tube and located between the top rod and the closed end of the inner tube And can be clamped by the ejector rod and the closed end.

Furthermore, in the bicycle air pressure bar, the buffer block is made of polyurethane foam plastic.

Furthermore, in the bicycle air pressure rod, the air end of the outer tube is formed with an air nozzle mounting hole; the bicycle air pressure rod further has an air nozzle assembly, which is detachably installed on the air nozzle installation hole of the outer tube The air nozzle assembly can make the adjustment air chamber communicate with the outside.

Furthermore, the bicycle pneumatic bar further has a pre-compression screw which penetrates through the end wall of the closed end of the inner tube along the length direction of the outer tube; the pre-compression adjusting screw is facing the outer tube The air nozzle installation hole; a buffer block, which is foam plastic; the buffer block is arranged in the inner tube, and is located between the ejector pin and the pre-compression screw, and can be clamped by the ejector pin and the pre-compression screw Assume.

Furthermore, the bicycle air pressure rod further has an extension rod which is arranged in the adjustment air chamber and extends along the length of the outer tube; one end of the extension rod is connected to the pre-compression screw in a relatively non-rotatable manner , The other end can be relatively rotatably connected to the air end of the outer tube.

In the following, in conjunction with the drawings and the preferred embodiments of this creation, the technical means adopted by this creation to achieve the predetermined creation purpose are further explained.

Please refer to Figure 1, Figure 2, Figure 4 and Figure 6, the bicycle pneumatic bar of this creation includes a top rod 10, an outer tube 20, an inner tube 30 and a slip ring 40; and in this embodiment, It further has an oil pressure valve 50 (as shown in FIG. 6), a control rod 60, an air nozzle assembly 70, and a pre-compression buffer component. The pre-compression buffer component includes a pre-compression screw 81, an extension rod 82 and a buffer block 83.

The aforementioned mandrel 10 has a shaft 11, and in this embodiment, further has a piston 12, and the mandrel 10 is formed with a first channel 13 and a plurality of second channels 14. The piston 12 is provided at the top end of the shaft 11.

The aforementioned outer tube 20 is slidably sleeved down outside the ejector rod 10, the top end of the outer tube 20 is an air end 201, the bottom end of the outer tube 20 is an oil end 202, and the oil end 202 is slidably sleeved on the ejector rod 10 shaft 11. In this embodiment, the gas end 201 of the outer tube 20 is formed with a gas nozzle installation hole 21.

Please refer to FIG. 4 and FIG. 5. The aforementioned inner tube 30 is located in the outer tube 20 and is slidably sleeved outside the ejector rod 10. The bottom end of the inner tube 30 is fixedly provided with the oil end 202 of the outer tube 20, and the top end of the inner tube 30 is a closed end 301. The inner tube 30 is formed with a plurality of oil holes 31 which penetrate the annular wall of the inner tube 30 and are adjacent to the oil end 202 of the outer tube 20.

In this embodiment, the inner tube 30 is slidably sleeved on the shaft 11 and the piston 12 of the mandrel 10. The inner ring surface of the inner tube 30 is spaced from the shaft 11, and the piston 12 divides the inner space of the inner tube 30 into a first oil chamber 32 and a second oil chamber 33. The first oil chamber 32 is located on the side of the piston 12 opposite to the shaft 11. The second oil chamber 33 is located between the outer ring surface of the shaft 11 and the inner ring surface of the inner tube 30, and the second oil chamber 33 communicates with an adjustment oil chamber 23 described later through an oil hole 31.

Please refer to Figures 6 and 7, the first channel 13 of the ejector rod 10 communicates with the first oil chamber 32, and the second channel 14 communicates with the first channel 13 and the second oil chamber 33, whereby the first oil chamber 32 And the second oil chamber 33 can communicate with each other through the first passage 13 and the second passage 14 (as shown in FIG. 7).

The aforementioned oil pressure valve 50 is provided in the piston 12, and can make the first oil chamber 32 and the second oil chamber 33 communicate with each other or the first oil chamber 32 and the second oil chamber 33 can be separated by the piston 12 and not communicated ( As shown in Figure 6). In this embodiment, the oil pressure valve 50 includes a valve core 51 and an elastic member 52. The valve core 51 is disposed in the first passage 13 of the ejector rod 10 and can move in an opening direction to open the first passage 13 or move in a closing direction to close the first passage 13. The elastic member 52 drives the valve core 51 to move in the closing direction, so that the first oil chamber 32 and the second oil chamber 33 tend to be disconnected.

Please refer to FIG. 4 and FIG. 5. The aforementioned control rod 60 slidably penetrates the top rod 10. One end of the control rod 60 protrudes from one end of the ejector rod 10 exposed to the outer tube 20, and the other end can push the valve core 51 in the opening direction, whereby the user can push the control rod 60 to make the first oil chamber 32 and the second oil chamber 32 and the second oil The chambers 33 communicate with each other.

The aforementioned slip ring 40 is slidably sleeved outside the inner tube 30 and slidably inserted in the outer tube 20, and the space in the outer tube 20 is divided into an unconnected adjusting air chamber 22 and an adjusting oil Room 23. The adjustment air chamber 22 is located between the air end 201 of the outer tube 20 and the slip ring 40, the adjustment oil chamber 23 is located between the slip ring 40 and the oil end 202 of the outer tube, and the adjustment oil chamber 23 is connected to the inner tube 30 through an oil hole 31.内的二油室33。 Within the second oil chamber 33.

Please refer to FIGS. 8 and 9, the aforementioned air nozzle assembly 70 is detachably provided in the air nozzle mounting hole 21 of the outer tube 20, and the air nozzle assembly 70 allows the adjustment air chamber 22 to communicate with the outside. Specifically, the air nozzle assembly 70 is a standard component in the prior art, and includes an air nozzle screw 71 and an air valve 72. The air valve 72 is fixed in the air nozzle mounting hole 21 through the air nozzle screw 71. The air nozzle assembly 70 can be used with an air pump and an inflating needle of a general bicycle, and the air pump can be used to inject air into the adjustment air chamber 22.

The aforementioned pre-compression screw 81 penetrates the end wall of the closed end 301 of the threaded inner tube 30 along the length direction of the outer tube 20, whereby the user can change the end extension of the pre-compression screw 81 by rotating the pre-compression screw 81 Enter the length of the inner tube 30. The pre-compression screw 81 is directly facing the gas nozzle installation hole 21 of the outer tube 20, that is, when viewed from the gas end 201 of the outer tube 20, the position of the precompression screw 81 is the same as the position of the gas nozzle installation hole 21.

The aforementioned extension rod 82 is provided in the adjustment air chamber 22 and extends along the length direction of the outer tube 20. The opposite ends of the extension rod 82 are respectively a first end 821 and a second end. The first end 821 is connected to the pre-compression screw 81 in a non-rotatable manner, and specifically, the first end 821 is pierced so as to move up and down. In a groove of the pre-compression screw 81. The second end of the extension rod 82 is relatively rotatably connected to the air end 201 of the outer tube 20.

Please refer to FIGS. 4 and 5, the aforementioned buffer block 83 is made of foam plastic, that is, the buffer block 83 contains a large amount of gas. The buffer block 83 is arranged in the inner tube 30 and is located between the top rod 10 and the pre-compression screw 81, and can be sandwiched by the top rod 10 and the pre-compression screw 81 (as shown in FIG. 4). The buffer block 83 can avoid the direct contact between the mandrel 10 and the pre-compression screw 81 to cause an impact. When sandwiched by the mandrel 10 and the pre-compression screw 81, the buffer block 83 can also be able to generate a small amount of deformation due to the compressibility of the internal gas to absorb impact. In the embodiment without the pre-compression screw 81, the buffer block 83 may also be located between the top rod 10 and the closed end 301 of the inner tube 30 so as to be sandwiched between the top rod 10 and the closed end 301. The buffer block 83 is specifically made of polyurethane foam.

The inner space of the inner pipe 30 (that is, the first oil chamber 32 and the second oil chamber 33) and the adjustment oil chamber 23 contain hydraulic oil. The adjustment air chamber 22 contains high-pressure gas, and the high-pressure gas pushes the outer tube 20 toward the oil end 202 through the hydraulic oil, so that the outer tube 20 tends to slide upward. Specifically, the pressure of the high-pressure gas in the adjustment air chamber 22 will push the hydraulic oil in the adjustment oil chamber 23 through the slip ring 40 and make it in a high-pressure state, and the pressure will be transmitted to the second oil chamber 33 through the oil hole 22 Hydraulic oil. When the user controls the oil pressure valve 50 with the control rod 60 to connect the second oil chamber 33 with the first oil chamber 32, the pressure is transmitted to the first oil chamber 32, and the oil end 202 of the outer tube 20 is affected by the hydraulic oil. Driven by pressure, the outer tube 20 slides upward. In a normal state, the second oil chamber 33 and the first oil chamber 32 are not connected, so that the piston 12 restricts the outer tube 20 from sliding relative to the plunger 10.

This creation can be used to form a height-adjustable telescopic seat post of a bicycle. At this time, the seat cushion of the bicycle (not shown in the figure) is located above the air end 201 of the outer tube 20, and the top post 10 is fixed to the frame of the bicycle. When the user wants to adjust the height of the seat cushion, the control lever 60 is operated to connect the second oil chamber 33 with the first oil chamber 32, so that the outer tube 20 is driven by the pressure of the high-pressure gas to automatically slide upward, thereby increasing the seat cushion position ; At this time, the user can also press down on the seat cushion to force the outer tube 20 to slide down to reduce the height of the seat cushion. After the height adjustment of the seat cushion is completed, the second oil chamber 33 and the first oil chamber 32 are restored to a non-communication state, so that the seat cushion is fixed at the adjusted height.

The advantage of the gas nozzle assembly 70 is that the user can adjust the gas pressure in the outer tube 20 by himself, thereby changing the force and the operating speed of the ejector rod 10. In addition, when the gas in the outer tube 20 gradually leaks over time, the user can use the gas nozzle assembly 70 to replenish the gas pressure by himself.

The advantage of the buffer block 83 is that when the user presses down on the seat cushion to force the outer tube 20 to slide to the limit, the push rod 10 and the pre-compression screw 81 indirectly abut through the buffer block 83, and the air inside the buffer block 83 The compressibility enables the cushion block 83 to exert a cushioning and shock-absorbing effect like a metal spring with less weight.

The advantage of the pre-compression screw 81 is that the length of the end of the pre-compression screw 81 extending into the inner tube 30 can be adjusted. Increasing the length of the pre-compression screw 81 extending into the inner tube 30 can increase the local pressure exerted by the pre-compression screw 81 on the buffer block 83, so that the buffer block 83 appears harder and has a more direct force feedback. Reducing the length of the pre-compression screw 81 extending into the inner tube 30 can make the buffer block 83 appear softer, and the effect of buffering and shock absorption is better.

Please refer to Figure 8 and Figure 9. When you want to adjust the pre-compression screw 81, remove the air nozzle assembly 70, and use a wrench or other tool T to extend into the outer tube 20 from the air nozzle mounting hole 21 and connect the extension rod The second end of 82 then rotates the pre-compression screw 81 through the extension rod 82, thereby changing the length of the end of the pre-compression screw 81 extending into the inner tube 30.

To sum up, the present creation further provides the inner tube 30 in the outer tube 20, and the slip ring 40 is slidably sheathed in the inner tube 30, so that the volume change of the air volume of the adjustment air chamber 22 is small, and the air pressure is reduced. The thrust of the rod is more linear. In addition, the inner tube 30 makes the hydraulic oil flow path longer and has greater flow resistance in the present invention, and further makes the thrust of the pneumatic rod more linear. Finally, the shaft 11 of the jack 10 can be designed to be thicker, so that the air pressure in the adjustment air chamber 22 is lower, allowing the user to adjust the pressure of the adjustment air chamber 22 with a general bicycle pump.

The above description is only the preferred embodiment of the creation, and does not limit the creation in any form. Although the creation has been disclosed in the preferred embodiment as above, it is not intended to limit the creation. Any technical field has Generally knowledgeable persons, without departing from the scope of this creative technical solution, can use the technical content disclosed above to make slight changes or modifications into equivalent embodiments with equivalent changes. However, any content that does not deviate from this creative technical solution is based on this Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence of the creation still fall within the scope of the technical solution for creation.

10: ejector 11: Shaft 12: Piston 13: First channel 14: Second channel 20: Outer tube 201: Air End 202: oil end 21: Air nozzle mounting hole 22: Adjust the air chamber 23: Adjust the oil chamber 30: inner tube 301: closed end 31: oil hole 32: The first oil chamber 33: The second oil chamber 40: slip ring 50: Oil pressure valve 51: Spool 52: Elastic 60: control lever 70: Gas nozzle assembly 71: Valve screw 72: Air valve 81: pre-compressed screw 82: Extension rod 821: first end 83: buffer block 90: bottom tube 91: seat cushion tube 911: Air Chamber 912: oil chamber 92: Sliding piston 93: ejector T: Tools

Figure 1 is the three-dimensional appearance of this creation. Figure 2 is an exploded view of the three-dimensional components of this creation. Figure 3 is a three-dimensional exploded view of the partial components of this creation. Figure 4 is a longitudinal cross-sectional view of this creation, showing that the outer tube slides down to the lower limit position relative to the ejector rod, so that the buffer block is clamped by the ejector rod and the pre-compression screw. Figure 5 is another longitudinal cross-sectional view of this creation, showing that the outer tube slides up to the upper limit position relative to the ejector rod. Figure 6 is a schematic cross-sectional view of the oil pressure valve created by this invention, showing that the spool of the oil pressure valve closes the first channel. Figure 7 is a schematic cross-sectional view of the hydraulic valve created by this invention, showing that the spool of the hydraulic valve opens the first channel to connect the first oil chamber and the second oil chamber, so that the outer tube can slide upward relative to the ejector rod. Figures 8 and 9 are the cut-away adjustment action diagrams of the pre-compression screw created by this invention, showing that after the air nozzle assembly is removed, a tool is inserted into the outer tube and the pre-compression screw is rotated through the extension rod. 10 and 11 are schematic diagrams of the cross-sectional action of the bicycle air bar in the prior art.

10: ejector

11: Shaft

12: Piston

20: Outer tube

201: Air End

202: oil end

21: Air nozzle mounting hole

22: Adjust the air chamber

23: Adjust the oil chamber

30: inner tube

301: closed end

31: oil hole

32: The first oil chamber

33: The second oil chamber

40: slip ring

50: Oil pressure valve

51: Spool

52: Elastic

60: control lever

70: Gas nozzle assembly

81: pre-compressed screw

82: Extension rod

83: buffer block

Claims (10)

A bicycle air pressure bar, including: A jack, which has a shaft; An outer tube is slidably sleeved down outside the ejector rod, the top end of the outer tube is an air end, the bottom end of the outer tube is an oil end, and the oil end is slidably sleeved on the ejector rod The shaft An inner tube located in the outer tube and slidably sleeved outside the ejector rod, the bottom end of the inner tube is fixed with the oil end of the outer tube, and the top end of the inner tube is a closed end; the The inner tube is formed with: At least one oil hole, which penetrates the annular wall of the inner tube and is adjacent to the oil end of the outer tube; A slip ring slidably sleeved on the inner tube and slidably inserted in the outer tube, and the space in the outer tube is divided into an unconnected adjusting air chamber and an adjusting oil chamber The adjustment air chamber is located between the air end of the outer tube and the slip ring, the adjustment oil chamber is located between the slip ring and the oil end of the outer tube, and the adjustment oil chamber uses the at least one oil hole Communicating with the inner space of the inner tube; Wherein, the adjustment oil chamber and the inner space of the inner tube have hydraulic oil; the adjustment air chamber has high pressure gas, and the high pressure gas pushes the outer tube toward the oil end through the hydraulic oil. The bicycle air pressure bar according to claim 1, wherein The ejector rod further has: A piston, which is arranged at the end of the rod through which the inner tube is inserted; the piston divides the inner space of the inner tube into a first oil chamber and a second oil chamber, and the first oil chamber is located opposite to the piston One side of the shaft; the second oil chamber is located between the outer ring surface of the shaft and the inner ring surface of the inner tube; the second oil chamber communicates with the adjusting oil chamber by the at least one oil hole; The bicycle air pressure rod further has: An oil pressure valve is arranged on the piston and selectively connects the first oil chamber with the second oil chamber. The bicycle air pressure bar as described in claim 2, wherein The ejector rod is formed with: A first passage communicating with the first oil chamber; At least one second passage communicating with the first passage and the second oil chamber; The hydraulic valve contains: A valve core, which is arranged in the first passage of the ejector rod, and can move in an opening direction to open the first passage or move in a closing direction to close the first passage; An elastic member drives the valve core to move in the closing direction. The bicycle air pressure bar according to claim 3, which further has A control rod slidably penetrates the plunger, one end of the control rod protrudes from one end of the plunger exposed to the outer tube, and the other end can push the valve core toward the opening direction. The bicycle air pressure bar according to any one of claims 1 to 4, wherein the bicycle air pressure bar further has A buffer block, which is foam plastic; the buffer block is arranged on the inner tube, is located between the top rod and the closed end of the inner tube, and can be sandwiched between the top rod and the closed end. The bicycle air pressure bar according to claim 5, wherein The buffer block is made of polyurethane foam plastic. The bicycle air pressure bar according to any one of claims 1 to 4, wherein The gas end of the outer tube is formed with a gas nozzle installation hole; The bicycle air pressure rod further has An air nozzle assembly is detachably arranged in the air nozzle installation hole of the outer tube, and the air nozzle assembly can make the adjustment air chamber communicate with the outside. The bicycle air pressure bar according to claim 7, which further has A pre-compression screw, which penetrates through the end wall of the closed end of the inner tube along the length direction of the outer tube; the pre-compression adjusting screw is facing the air nozzle installation hole of the outer tube; A buffer block, which is made of foam plastic; the buffer block is arranged in the inner tube, is located between the top rod and the pre-compression screw, and can be clamped by the top rod and the pre-compression screw; The bicycle air pressure bar according to claim 8, which further has An extension rod, which is arranged in the adjustment air chamber and extends along the length of the outer tube; one end of the extension rod is connected to the pre-compression screw in a non-rotatable manner, and the other end is connected to the air of the outer tube in a relatively rotatable manner end. The bicycle air pressure bar according to claim 8, wherein The buffer block is made of polyurethane foam plastic.

Images