CN217170864U - Bicycle seat tube adjusting structure - Google Patents

Abstract

A bicycle seat tube adjusting structure is provided with an outer tube, wherein a pneumatic rod is arranged in the outer tube, a body of the pneumatic rod is combined in the outer tube and extends out of a telescopic rod, an inner tube is axially and movably arranged in the outer tube, the telescopic rod of the pneumatic rod is combined at one end of the inner tube, the diameter of the inner tube is larger than the outer diameter of the body of the pneumatic rod, so that the body of the pneumatic rod can axially move in the inner tube relatively, a limiting structure is sleeved on the body of the pneumatic rod and is arranged between the body and the inner tube to limit the inner tube from rotating relative to the pneumatic rod and the outer tube; the limiting structure is arranged between the inner tube and the main body of the air pressure rod, so the outer tube can not deform due to the friction force of the limiting structure, the manufacturing process can be reduced, the strength and the light weight can be realized, and the effects of reducing weight and stabilizing the seat cushion can be realized.

Description

Bicycle seat tube adjusting structure

Technical Field

The utility model relates to a structure of a bicycle; in particular to a bicycle seat tube adjusting structure.

Background

The seat tube is inserted into the vertical tube of the bicycle frame, when the height of the seat is adjusted, the seat tube is manually inserted into the vertical tube or pulled out upwards, and then the vertical tube is pressed by a quick-release structure to tightly clamp the seat tube.

However, the seat tube adjustment structure with the air pressure rod is used for preventing the seat tube from deflecting in the lifting process, and a groove is formed in the outer tube and matched with the limiting piece around the seat tube, so that the seat tube cannot rotate relative to the outer tube. However, in order to form the limiting structure, the wall surface of the outer tube needs to be thickened for processing and forming the groove, so that the weight of the outer tube is heavier, and the sliding friction force of the limiting structure can also cause the deformation of the outer tube, thereby preventing the seat tube from moving up and down relative to the outer tube.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a structure of a bicycle seat tube, which can prevent an inner tube from rotating relative to an outer tube when the inner tube is lifted, and which can reduce the thickness of the outer tube without forming a limit structure, so that the structure of the bicycle seat tube can maintain strength and can be light-weighted.

Accordingly, the present invention provides a bicycle seat tube adjusting structure, which comprises an outer tube, an air pressure rod and an inner tube. One end of the outer tube is a closed end. The air pressure rod is arranged in the outer tube and comprises an air pressure rod body and a telescopic rod extending out of the air pressure rod body, and the air pressure rod body is fixed in the outer tube. The inner tube is movably arranged in the outer tube along the axial direction, one end of the inner tube is provided with a combining part to be combined with the telescopic rod of the air pressure rod, the inner diameter of the inner tube is larger than the outer diameter of the air pressure rod body, so that the air pressure rod body can axially move in the inner tube relatively, a limiting structure is arranged between the air pressure rod body and the inner wall of the inner tube, and the limiting structure is sleeved on the air pressure rod body and used for limiting the inner tube not to rotate relative to the air pressure rod and the outer tube.

The utility model has the advantages of, spacing structure is located between inner tube and the atmospheric pressure stick body, does not relate to the structure of outer tube. Therefore, the process of manufacturing the outer pipe can be reduced, the thickness of the wall surface of the outer pipe is reduced, the weight of the outer pipe is reduced, the outer pipe with a thin pipe wall is lightened under the condition of maintaining the strength, and the inner pipe can be stably clamped even if the outer pipe is deformed when the outer pipe is subjected to external force. In addition, because the outer tube can not produce the deformation because of the frictional force of spacing structure, can not cause the hindrance of inner tube when the outer tube goes up and down.

Drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention.

Fig. 2 is an exploded view of the above preferred embodiment of the present invention.

Fig. 3 is an enlarged exploded view of the end plug according to the above preferred embodiment of the present invention.

Fig. 4 is an exploded view of the sleeve, the limiting member and the positioning nut according to the above preferred embodiment of the present invention.

Fig. 5 is a perspective view of the air pressure bar combined with the position limiting member according to the above preferred embodiment of the present invention.

Fig. 6 is a top view of the above preferred embodiment of the present invention.

Fig. 7 is a sectional view in the direction 7-7 of fig. 6.

Fig. 8 is a partially enlarged view of fig. 7.

Fig. 9 is a schematic view illustrating the operation of descending the seat tube for a bicycle according to the above preferred embodiment of the present invention.

[ the utility model ]

100: bicycle seat tube adjusting structure

10: outer tube

12: outer pipe body

121: outer hole

122: bolt

14: upper bearing seat

141: flange part

142: bearing part

143: dust-proof ring

144: upper bearing

16: end plug

161: flange

162: placing hole

163: countersunk hole

18: cam seat

181: base seat

1811: fixing hole

1812: fixing screw hole

182: cam support

1821: cam wheel

1822: pull rope

20: air pressure bar

22: air pressure bar body

221: fixed pipe

222: air pressure release button

24: telescopic rod

241: convex rod

242: fixing nut

30: bicycle seat tube

32: inner pipe

321: joining part

322: groove

323: top perforation

34: lower bearing pedestal

341: lower bearing

36: top seat

38: seat cushion fixing component

40: position limiting structure

42: sleeve barrel

421: caulking groove

422: threaded ring

423: cutting groove

44: position limiting piece

46: positioning nut

Detailed Description

In order to explain the present invention more clearly, the following detailed description will be given with reference to the accompanying drawings. Referring to fig. 1 to 8, a bicycle seat tube adjusting structure 100 according to a preferred embodiment of the present invention includes an outer tube 10, a pneumatic rod 20, an inner tube 32, and a limiting structure 40 disposed between the pneumatic rod 20 and the inner tube 32. The outer tube 10 is disposed within a riser of a bicycle frame when the bicycle seat tube adjusting structure 100 is in use.

The outer tube 10 is a vertical tube and has a closed end at one end.

The air pressure bar 20 is arranged in the outer tube 10 and comprises an air pressure bar body 22 and a telescopic rod 24, wherein one end of the air pressure bar body 22 is combined with the closed end of the outer tube 10, so that the air pressure bar body 22 is fixed in the outer tube 10; the telescopic rod 24 extends out of the other end of the pneumatic rod body 22.

The inner tube 32 is movably provided in the outer tube 10 in the axial direction, and the thickness of the peripheral wall of the outer tube 10 may be set to be smaller than that of the inner tube 32 in order to easily deform and tightly clamp the inner tube 32 when the outer tube 10 is subjected to an external force. The top end of the inner tube 32 has a connection portion 321 for connecting with the telescopic rod 24 of the air pressure bar 20, when the depth of the inner tube 32 inserted into the outer tube 10 is changed, the length of the telescopic rod 24 extending from the air pressure bar body 22 is changed to a different length, the inner diameter of the inner tube 32 is larger than the outer diameter of the air pressure bar body 22, and the inner tube 32 and the air pressure bar body 22 are radially overlapped, so that the air pressure bar body 22 can move axially in the inner tube 32 relatively when the depth of the inner tube 32 inserted into the outer tube 10 is changed.

The limiting structure 40 is sleeved on the air pressure rod body 22 for limiting the inner tube 32 from rotating relative to the air pressure rod 20 and the outer tube 10.

The inner tube 32 is a tube portion of the bicycle seat tube 30, and a seat cushion (not shown) of the bicycle is coupled to a top end of the bicycle seat tube 30 when the bicycle seat tube adjusting structure 100 is in use. Referring to fig. 7 to 9, due to the characteristics of the gas cylinder 20 that it can be contracted when being stressed and can be expanded when being released, the gas cylinder 20 supports the inner tube 32 when the inner tube 32 is inserted into the outer tube 10 under stress, or pushes a portion of the inner tube 32 out of the outer tube 10 when the gas cylinder 20 is released. Therefore, the user can conveniently change the depth of the inner tube 32 inserted into the outer tube 10, after the adjustment is completed, the outer tube 10 is pressed by the quick-release or other binding structure on the vertical tube, the high-low position of the seat cushion is fixed in a way that the outer tube 10 deforms and tightly clamps the inner tube 32, and in the process of adjusting the high-low position of the seat cushion, the front end of the seat cushion can always keep a forward position because the inner tube 32 is restrained by the limiting structure 40 and can not rotate.

In the above preferred embodiment of the present invention, since the position-limiting structure 40 is already provided between the pressure rod body 22 and the inner tube 32, there is no need to additionally provide a position-limiting structure between the outer tube 10 and the inner tube 32. Thus, the process of manufacturing the outer tube 10 and the thickness of the tube wall can be reduced, the weight can be reduced while maintaining the strength of the outer tube 10, and the weight of the bicycle seat tube adjusting structure 100 can be reduced, and the inner tube 32 can be stably clamped and fixed even when the outer tube 10 is deformed by compression. Further, since the damping position when the inner tube 32 is lifted and lowered is between the air pressure rod 20 and the inner tube 32, the outer tube 10 is not deformed by friction of the stopper structure 40, and the inner tube 32 is not hindered when lifted and lowered.

The detailed construction of the above preferred embodiment is further explained. Referring to fig. 2 and fig. 7 to 8, the outer tube 10 has an outer tube 12, the top end of the outer tube 10 is provided with an upper bearing seat 14, the upper bearing seat 14 has a flange portion 141 and a bearing portion 142, the outer diameter of the flange portion 141 is larger than the outer diameter of the bearing portion 142, and the flange portion 141 is fastened to the top edge of the outer tube 10 for positioning, so that the bearing portion 142 penetrates into the outer tube 10 from the top end. A dust ring 143 is circumferentially embedded in the inner wall of the flange portion 141, an upper bearing 144 is circumferentially embedded in the inner wall of the bearing portion 142, the inner tube 32 passes through the upper bearing seat 14 and slidably contacts the dust ring 143 and the upper bearing 144 with the outer wall thereof, and the dust ring 143 prevents dirt from entering the outer tube 10; the bottom end of the inner tube 32 is provided with a lower bearing seat 34, the outer wall of the lower bearing seat 34 is embedded with and fixed to a lower bearing 341, the lower bearing 341 slidably contacts the inner wall of the outer tube 10, in the preferred embodiment, the upper bearing 144 and the lower bearing 341 are self-lubricating bearings, and in other embodiments, the upper bearing 144 and the lower bearing 341 may also be linear bearings or bushings.

Referring to fig. 3 and 7, an outer hole 121 is formed around the bottom of the outer tube 10, an end plug 16 is disposed at the bottom end of the outer tube 10, a flange 161 is protruded around the bottom end of the end plug 16, the flange 161 abuts against the bottom edge of the outer tube 10, an insertion hole 162 is formed in the middle of the end plug 16, a counter bore 163 is formed around the end plug, and the inner end and the outer end of the counter bore 163 are respectively communicated with the insertion hole 162 and the outer hole 121.

A cam seat 18 is arranged in cooperation with the insertion hole 162, the cam seat 18 comprises a base 181 and a cam bracket 182, the base 181 is inserted into the insertion hole 162 and is provided with a fixing hole 1811 and a fixing screw hole 1812 in the middle and around, and the inner end and the outer end of the fixing screw hole 1812 are respectively communicated with the fixing hole 1811 and the counter bore 163; the cam bracket 182 is connected to the bottom side of the base 181 and pivotally connected to a cam 1821 in the middle, and the cam 1821 is disposed below the fixing hole 1811 and connected to a pull rope 1822.

The gas cylinder 20 is provided with a fixing tube 221 protruding from the bottom end of the gas cylinder body 22 along the axial direction, the fixing tube 221 is embedded into the fixing hole 1811, a bolt 122 is provided in the outer hole 121, the bolt 122 penetrates through the outer hole 121 and the counter bore 163 and is screwed into the fixing screw hole 1812, the inner end of the bolt 122 presses the fixing tube 221 of the gas cylinder body 22, the gas cylinder 20 is fixed to the bottom end of the outer tube 10, a gas pressure release button 222 protruding downward penetrates through the fixing tube 221, and the bottom end of the gas pressure release button 222 abuts against the cam 1821.

Referring to fig. 2 and 7, the middle of the coupling portion 321 has a top through hole 323, a protruding rod 241 with a diameter narrower than other portions of the telescopic rod 24 is formed at the top end of the telescopic rod 24 by matching the top through hole 323, the protruding rod 241 passes through the top through hole 323 and is screwed with a fixing nut 242 at the portion passing through the top through hole 323, so as to couple the top end of the telescopic rod 24 to the coupling portion 321. The top end of the inner tube 32 is connected to a top seat 36, and a seat cushion fixing member 38 for fixing a bicycle seat cushion is screwed through the top seat 36.

Referring to fig. 2, 4 and 7, the limiting structure 40 includes a sleeve 42, at least one limiting member 44 is attached to an outer surface of the sleeve 42, the at least one limiting member 44 is attached by surrounding and spacing at least one slot 421 on an outer circumferential surface of the sleeve 42, in the preferred embodiment, three slots 421 are surrounded and spaced equally, each slot 421 is a long-strip-shaped groove with an extending direction parallel to the axial direction of the inner tube 32, each limiting member 44 is embedded in each slot 421, each limiting member 44 is a long-strip-shaped rod with an extending direction parallel to the axial direction of the inner tube 32 and is embedded and fixed in each slot 421 at an inner side, a groove 322 is formed on an inner wall of the inner tube 32 by matching each limiting member 44, each groove 322 is a long-strip-shaped groove with an extending direction parallel to the axial direction of the inner tube 32, and an outer side of each limiting member 44 is slidably received in each groove 322.

The sleeve 42 may be a flexible ring body and tightly fixed around the pressure rod body 22, or as in the preferred embodiment, a threaded ring 422 extends axially from the bottom end of the sleeve 42, the threaded ring 422 has at least one groove 423, and in the preferred embodiment, a plurality of grooves 423 are provided and a positioning nut 46 is screwed on the threaded ring 422, so that the positioning nut 46 presses the portion of the threaded ring 422 between two adjacent grooves 423, and the threaded ring 422 tightly clamps the outer surface of the pressure rod body 22, thereby fixing the sleeve 42 around the pressure rod body 22.

The above description is only a preferred embodiment of the present invention, and all equivalent changes to the application of the present invention in the specification and claims should be considered as being included in the scope of the present invention.

Claims (10)

1. A bicycle seat tube adjusting structure, comprising:

one end of the outer tube is a closed end;

the air pressure rod is arranged in the outer tube and comprises an air pressure rod body and a telescopic rod extending out of the air pressure rod body, and the air pressure rod body is fixed in the outer tube; and

the inner tube is movably arranged in the outer tube along the axial direction, one end of the inner tube is provided with a combining part for combining with the telescopic rod of the air pressure rod, the inner diameter of the inner tube is larger than the outer diameter of the air pressure rod body, so that the air pressure rod body can move axially in the inner tube relatively, a limiting structure is arranged between the air pressure rod body and the inner wall of the inner tube, and the limiting structure is sleeved on the air pressure rod body and used for limiting the inner tube not to rotate relative to the air pressure rod and the outer tube.

2. The bicycle seat tube adjusting structure according to claim 1, wherein the limiting structure is a sleeve, at least one limiting member is attached to an outer surface of the sleeve, a groove is formed in an inner wall of the inner tube to receive the limiting member, the groove is an elongated groove extending in a direction parallel to an axial direction of the inner tube, and the limiting member is at least partially slidably received in the groove.

3. The bicycle seat tube adjusting structure as defined in claim 2, wherein said sleeve has a threaded ring extending axially at one end thereof, said threaded ring having at least one cut-out, said threaded ring being threaded with a positioning nut, said positioning nut pressing said threaded ring such that a portion of said threaded ring between two adjacent cut-outs presses an outer surface of said air pressure bar body to fix said sleeve to said air pressure bar body.

4. The bicycle seat tube adjusting structure according to claim 2, wherein the outer circumferential surface of the sleeve is provided with at least one caulking groove at intervals, the at least one caulking groove is an elongated groove having an extending direction parallel to the axial direction of the inner tube for correspondingly disposing the at least one limiting member, the at least one limiting member is an elongated rod having an extending direction parallel to the axial direction of the inner tube, the inner side of the limiting member is embedded in the caulking groove for fixation, and the outer side of the limiting member is slidably received in the groove.

5. The bicycle seat tube adjusting structure of claim 1, wherein an upper bearing seat is provided at a top end of the outer tube, an upper bearing is provided in the upper bearing seat, the inner tube passes through the upper bearing seat and slidably contacts the upper bearing with an outer wall, a lower bearing seat is provided at a bottom end of the inner tube, a lower bearing is provided outside the lower bearing seat, and the lower bearing slidably contacts an inner wall of the outer tube.

6. The bicycle seat tube adjusting structure of claim 5, wherein said upper bearing and said lower bearing are self-lubricating bearings, respectively, said upper bearing housing having a flange portion and a bearing portion, said flange portion having an outer diameter larger than an outer diameter of said bearing portion, said bearing portion penetrating into said outer tube and said upper bearing circumferentially fitted in an inner wall of said bearing portion, said flange portion being fastened to a top edge of said outer tube, said inner wall of said flange portion circumferentially fitted with a dust ring, said outer wall of said inner tube slidably contacting said dust ring for preventing dirt from entering into said outer tube.

7. The bicycle seat tube adjusting structure as defined in claim 5, wherein an end plug is provided at a bottom end of said outer tube, a flange is protruded from a periphery of a bottom end of said end plug, said flange is fixed against a bottom edge of said outer tube, said end plug has an insertion hole, a cam holder is provided in cooperation with said insertion hole, said cam holder includes a base and a cam bracket connected to said base, said base is fixed through said insertion hole, said base has a fixing hole, said cam bracket is pivoted with a cam, said cam is provided below said fixing hole and connected with a pull rope; the bottom end of the air pressure rod body is provided with a fixed pipe in a protruding mode along the axial direction, the fixed pipe is embedded into the fixed hole to be fixed, a downward protruding air pressure release button penetrates through the fixed pipe, and the bottom end of the air pressure release button abuts against the cam.

8. The bicycle seat tube adjusting structure as defined in claim 7, wherein an outer hole is formed around a bottom of said outer tube, a counter bore is formed around said end plug, both inner and outer ends of said counter bore communicate with said insertion hole and said outer hole, respectively, a fixing screw hole is formed around said base, both inner and outer ends of said fixing screw hole communicate with said fixing hole and said counter bore, respectively, a bolt is provided, said bolt penetrates said outer hole, said counter bore and is screw-locked to said fixing screw hole, an inner end of said bolt presses said fixing tube of said air pressure bar body to fix said air pressure bar to a bottom end of said outer tube.

9. The bicycle seat tube adjusting structure of claim 8, wherein the combining portion has a top through hole, the top end of the telescopic rod forms a protruding rod with a narrower diameter, the protruding rod passes through the top through hole, and a fixing nut is screwed on a part of the protruding rod passing through the top through hole to combine the top end of the telescopic rod with the combining portion.

10. The bicycle seat tube adjusting structure of claim 9, wherein the top end of the inner tube is connected to a top seat, and a seat fixing member is screwed through the top seat and is used for fixing a bicycle seat.

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