CN217170864U - Bicycle seat tube adjustment structure - Google Patents

Abstract

A bicycle seat tube adjustment structure is provided with an outer tube, an air pressure rod is arranged in the outer tube, the body of the air pressure rod is combined with the outer tube and a telescopic rod extends out, and a telescopic rod is axially movable in the outer tube. The inner tube, the telescopic rod of the pneumatic rod is combined with one end of the inner tube, the diameter of the inner tube is larger than the outer diameter of the pneumatic rod body, so that the pneumatic rod body can move axially relative to the inner tube. , a limiting structure is sleeved on the body of the pneumatic rod, and the limiting structure is set between the body and the inner tube to restrict the inner tube from rotating relative to the pneumatic rod and the outer tube; The structure is arranged between the inner tube and the body of the air pressure rod, so the outer tube will not be deformed by the frictional force of the limiting structure, and the manufacturing process can be reduced, which can have both strength and light weight, and is more stable when it has weight reduction and fixed seat cushion effect.

Description

Bicycle seat tube adjustment structure

technical field

The utility model relates to a structure of a bicycle, in particular to an adjustment structure of a bicycle seat tube.

Background technique

The existing method of fixing the seat cushion of a bicycle is to insert a seat tube with a seat cushion through the seat tube of the bicycle frame. When the height of the seat cushion is adjusted, the seat tube is inserted into the seat tube or pulled up by manpower, and then quickly The dismantling structure presses the seat tube tightly to the seat tube, but due to the laborious adjustment, some manufacturers have designed a seat tube adjustment structure. An outer tube is arranged in the seat tube, and the air pressure rod in the outer tube supports the seat tube, allowing the user to When sitting on the seat cushion, the body weight and the elasticity of the air pressure rod can be used to adjust the seat cushion to an appropriate position and then fix it.

However, in order to avoid the deflection of the seat tube during the lifting process, a groove is formed in the outer tube to cooperate with the limiting members around the seat tube, so that the seat tube cannot rotate relative to the outer tube. However, in order to form this limit structure, it is necessary to thicken the wall surface of the outer tube to allow the grooves to be processed and formed. This will make the outer tube heavier, and the frictional force of the limit structure sliding will also cause the outer tube to deform. Prevent the seat tube from moving up and down relative to the outer tube.

Utility model content

In view of this, the purpose of the present utility model is to provide a structure of a bicycle seat tube, so that the inner tube cannot be rotated relative to the outer tube when lifting and lowering, and the outer tube does not need to form a position-limiting structure, so the thickness of the outer tube can be designed to be thinner, The adjustment structure of the bicycle seat tube can maintain the strength and reduce the weight.

In order to achieve the above purpose, the present invention provides a bicycle seat tube adjustment structure, which includes an outer tube, an air pressure rod and an inner tube. One end of the outer tube is a closed end. The pneumatic rod is arranged in the outer tube and includes a pneumatic rod body and a telescopic rod extending from the pneumatic rod body, and the pneumatic rod body is fixed in the outer tube. The inner tube can be movably arranged in the outer tube in the axial direction, one end of the inner tube has a joint part to be combined with the telescopic rod of the pneumatic rod, and the inner diameter of the inner tube is larger than that of the inner tube. The outer diameter of the pneumatic rod body enables the pneumatic rod body to move axially relative to the inner tube. A limit structure is provided between the pneumatic rod body and the inner wall of the inner tube. The structure is sleeved on the pneumatic rod body to restrict the inner tube from rotating relative to the pneumatic rod and the outer tube.

The effect of the present invention is that the limiting structure is arranged between the inner tube and the pneumatic rod body, and does not involve the structure of the outer tube. Therefore, the manufacturing process of the outer tube can be reduced, the thickness of the outer tube wall can be reduced to reduce its weight, and the strength can be maintained at the same time. Internal inner tube. In addition, since the outer tube will not be deformed by the frictional force of the limiting structure, the inner tube will not be hindered when the outer tube is raised and lowered.

Description of drawings

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

FIG. 2 is an exploded view of the above-mentioned preferred embodiment of the present invention.

FIG. 3 is an enlarged exploded view of the end plug of the above-mentioned preferred embodiment of the present invention.

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 pneumatic rod combined with the limiting member according to the above preferred embodiment of the present invention.

FIG. 6 is a top view of the above-mentioned preferred embodiment of the present invention.

FIG. 7 is a cross-sectional view taken along the line 7-7 of FIG. 6 .

FIG. 8 is a partial enlarged view of FIG. 7 .

9 is a schematic view of the action of the bicycle seat tube descending according to the above preferred embodiment of the present invention.

[the utility model]

100: Bicycle seat tube adjustment structure

10: Outer tube

12: Outer tube body

121: Outer hole

122: Bolts

14: Upper bearing seat

141: Flange part

142: Bearing Department

143: Dust ring

144: Upper bearing

16: End plug

161: Flange

162: Insertion hole

163: Countersunk hole

18: Cam seat

181: Pedestal

1811: Fixing hole

1812: Fixing screw holes

182: Cam bracket

1821: Cam

1822: Drawstring

20: Air pressure bar

22: Air pressure rod body

221: Fixed tube

222: Air pressure release button

24: Telescopic rod

241: Protruding rod

242: Retaining Nut

30: Bike seat tube

32: Inner tube

321: Joint

322: Groove

323: Top perforation

34: Lower bearing seat

341: Lower bearing

36: Top seat

38: Seat Cushion Fixing Components

40: Limit structure

42: Sleeve

421: Groove

422: Threaded Ring

423: Trough

44: Limiter

46: Positioning nut

Detailed ways

In order to illustrate the present invention more clearly, preferred embodiments are given and described in detail with the accompanying drawings as follows. Please refer to FIGS. 1 to 8 , a bicycle seat tube adjustment structure 100 according to a preferred embodiment of the present invention includes an outer tube 10 , an air pressure rod 20 , an inner tube 32 , and an air pressure rod 20 and an inner tube 32 . Limiting structure 40 between tubes 32 . When the bicycle seat tube adjusting structure 100 is used, the outer tube 10 is arranged in the seat tube of the bicycle frame.

The outer tube 10 is a vertical tube body and one end of the bottom is a closed end.

The pneumatic rod 20 is arranged in the outer tube 10 and includes a pneumatic rod body 22 and a telescopic rod 24. One end of the pneumatic rod body 22 is combined with the closed end of the outer tube 10, so that the pneumatic rod body 22 is fixed in the outer tube 10; the The telescopic rod 24 extends from the other end of the pneumatic rod body 22 .

The inner tube 32 can be movably arranged in the outer tube 10 in the axial direction. In order to make the periphery of the outer tube 10 easily deformed when subjected to an external force, the inner tube 32 can be clamped tightly around the inner tube 32, and the thickness of the peripheral wall of the outer tube 10 can be set. It is a type that is smaller than the thickness of the peripheral wall of the inner tube 32 . One end of the top side of the inner tube 32 has a joint portion 321 to be combined with the telescopic rod 24 of the pneumatic rod 20. When the depth of the inner tube 32 inserted into the outer tube 10 changes, the length of the telescopic rod 24 extending from the pneumatic rod body 22 also varies. To change to different lengths, the inner diameter of the inner tube 32 is larger than the outer diameter of the pneumatic rod body 22, and the inner tube 32 and the pneumatic rod body 22 are kept in a radially overlapping state, so that the pneumatic rod body 22 is inserted into the inner tube 32. When the depth of the outer tube 10 is changed, it can move axially relative to the inner tube 32 .

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

The inner tube 32 is a tube portion of the bicycle seat tube 30 . When the bicycle seat tube adjusting structure 100 is used, the bicycle seat cushion (not shown in the figure) is combined with the top of the bicycle seat tube 30 . Referring to FIGS. 7 to 9 , the pneumatic rod 20 can support the inner tube 32 when the inner tube 32 is inserted into the outer tube 10 under force by virtue of the feature that the pneumatic rod 20 can be shortened when it is stressed and can be extended when it is released, or Portions of the inner tube 32 are pushed out of the outer tube 10 when the gas bar 20 is released. In this way, it is convenient for the user to freely change the depth at which the inner tube 32 is 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 riser, and the outer tube 10 is deformed to clamp the inner tube 32 tightly. In the process of adjusting the height of the seat cushion, the inner tube 32 cannot rotate due to the restriction of the position-limiting structure 40 of the inner tube 32, so that the front end of the seat cushion can always be kept in the forward position.

Since the above-mentioned preferred embodiment of the present invention has provided the limiting structure 40 between the pneumatic rod body 22 and the inner tube 32 , there is no need to provide another limiting structure between the outer tube 10 and the inner tube 32 . In this way, the manufacturing process of the outer tube 10 and the thickness of the tube wall can be reduced, and the weight of the outer tube 10 can be reduced while maintaining the strength of the outer tube 10 , so as to reduce the weight of the bicycle seat tube adjustment structure 100 and cause the outer tube 10 to be compressed and deformed. The inner tube 32 is still stably clamped and fixed. In addition, since the damping position of the inner tube 32 is between the pneumatic rod 20 and the inner tube 32 , the outer tube 10 will not be deformed due to friction with the position limiting structure 40 , and will not hinder the lifting of the inner tube 32 .

The detailed configuration of the above-described preferred embodiment is further explained. Referring to FIG. 2 and FIGS. 7 to 8 , the outer tube 10 has an outer tube body 12 , an upper bearing seat 14 is disposed at the top of the outer tube 10 , and 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 positioned on the top edge of the outer tube 10 , so that the bearing portion 142 penetrates into the outer tube 10 from the top. A dust ring 143 is embedded around the inner wall of the flange portion 141 , an upper bearing 144 is embedded around the inner wall of the bearing portion 142 , and the inner tube 32 passes through the upper bearing seat 14 and slidably contacts the dust ring with its outer wall. 143 and the upper bearing 144, the dustproof ring 143 can prevent 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 a fixed lower bearing 341, and the lower bearing 341 can slide In this preferred embodiment, the upper bearing 144 and the lower bearing 341 are self-lubricating bearings respectively. In other embodiments, the upper bearing 144 and the lower bearing 341 can also be linear bearings or bushings.

Please refer to FIG. 3 and FIG. 7 , an outer hole 121 is formed around the bottom of the outer tube 10 , an end plug 16 is provided at the bottom end of the outer tube 10 , and a flange 161 is protruded around the bottom end of the end plug 16 . The flange 161 abuts against Adjacent to the bottom edge of the outer tube 10 , the end plug 16 has an insertion hole 162 in the middle and a countersunk hole 163 around it. The inner and outer ends of the countersunk hole 163 communicate with the insertion hole 162 and the outer hole 121 respectively.

A cam seat 18 is provided in cooperation with the insertion hole 162. The cam seat 18 includes a base 181 and a cam bracket 182. The base 181 is inserted through the insertion hole 162 and has a fixing hole 1811 and a fixing screw hole 1812 in the middle and around it. The inner and outer ends of the screw hole 1812 communicate with the fixing hole 1811 and the countersunk hole 163 respectively; the cam bracket 182 is connected to the bottom side of the base 181 and is pivotally connected to a cam 1821 in the middle. Rope 1822.

A fixing tube 221 is protruded from the bottom end of the air pressure bar body 22 along the axial direction. The fixing tube 221 is embedded in the fixing hole 1811, and a bolt 122 is arranged in the outer hole 121. The bolt 122 penetrates the outer hole 121 and sinks. The head hole 163 is screwed into the fixing screw hole 1812, the inner end of the bolt 122 presses the fixing tube 221 of the air pressure rod body 22, and the air pressure rod 20 is fixed to the bottom end of the outer tube 10, and a downward protrusion is inserted through the fixing tube 221. The air pressure release button 222 comes out, and the bottom end of the air pressure release button 222 abuts against the cam 1821 .

Referring to FIG. 2 and FIG. 7 , a top through hole 323 is formed in the middle of the joint portion 321 , and the top through hole 323 forms a protruding rod 241 with a narrower diameter than other parts of the telescopic rod 24 at the top of the telescopic rod 24 . 241 passes through the top through hole 323 and is screwed with a fixing nut 242 at the part passing through the top through hole 323 , so as to connect the top end of the telescopic rod 24 to the joint portion 321 . The top end of the inner tube 32 is connected to a top seat 36, and a seat cushion fixing component 38 for fixing the bicycle seat cushion is combined with the top seat 36 through screws.

Please refer to FIGS. 2 , 4 and 7 , the limiting structure 40 has a sleeve 42 , at least one limiting piece 44 is attached to the outer surface of the sleeve 42 , and the at least one limiting piece 44 is attached in the The outer peripheral surface of the sleeve 42 is provided with at least one inserting groove 421 around and at intervals. In this preferred embodiment, there are three inserting grooves 421 surrounding and equally spaced. In the parallel elongated grooves, each limiting member 44 is embedded in each inserting groove 421 , and each limiting member 44 is a long rod whose extension direction is parallel to the axial direction of the inner tube 32 and is embedded in each inserting groove at the inner side. 421 is fixed, and a groove 322 is formed on the inner wall of the inner tube 32 with each limiting member 44. Each groove 322 is an elongated groove whose extension direction is parallel to the axial direction of the inner tube 32. The outer side of each limiting member 44 can be It is slidably accommodated in each groove 322 .

The sleeve 42 can be an elastic ring body and is fastened around the pneumatic rod body 22, or as in the preferred embodiment, a threaded ring 422 is axially extended from the bottom end of the sleeve 42. The threaded ring 422 There is at least one groove 423, in this preferred embodiment, there are a plurality of grooves 423 and a positioning nut 46 is screwed to the threaded ring 422, so that the positioning nut 46 presses the threaded ring 422 to be located in two adjacent grooves 423 The threaded ring 422 clamps the outer surface of the pneumatic rod body 22 , thereby fixing the sleeve 42 around the pneumatic rod body 22 .

The above are only preferred and feasible embodiments of the present invention, and all equivalent changes made by applying the description of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

Claims (10)

1. A bicycle seat tube adjustment structure is characterized in that, comprising: an outer tube, one end of which is a closed end; a pneumatic rod, disposed in the outer tube and comprising a pneumatic rod body and a telescopic rod extending from the pneumatic rod body, and the pneumatic rod body is fixed in the outer tube; and an inner tube, which can be movably arranged in the outer tube in the axial direction, one end of the inner tube has a joint part to be combined with the telescopic rod of the pneumatic rod, and the inner diameter of the inner tube is larger than The outer diameter of the pneumatic rod body enables the pneumatic rod body to move axially relative to the inner tube. A limit structure is provided between the pneumatic rod body and the inner wall of the inner tube. The position structure is sleeved on the pneumatic rod body to restrict the inner tube from rotating relative to the pneumatic rod and the outer tube. 2 . The bicycle seat tube adjustment structure according to claim 1 , wherein the limiting structure is a sleeve, the outer surface of the sleeve is attached with at least one limiting member, and the inner wall of the inner tube forms a The groove is used for accommodating the limiting member, the groove is an elongated groove extending in parallel with the axial direction of the inner tube, and the limiting member is at least partially slidably accommodated in the groove. 3 . The bicycle seat tube adjustment structure according to claim 2 , wherein a threaded ring is axially extended from one end of the sleeve, and the threaded ring has at least one groove, which is screwed and positioned on the threaded ring. 4 . A nut, the positioning nut presses the threaded ring, so that the part of the threaded ring located between the two adjacent grooves presses the outer surface of the pneumatic rod body, and the sleeve is fixed on the pneumatic rod ontology. 4 . The bicycle seat tube adjustment structure according to claim 2 , wherein the outer peripheral surface of the sleeve is surrounded and spaced with at least one insert groove, and the at least one insert groove is an extension direction of the inner tube shaft. 5 . A parallel elongated groove is used to correspondingly set the at least one stopper, and the at least one stopper is respectively an elongated rod whose extension direction is parallel to the axial direction of the inner tube. The inner side of the piece is embedded in the inserting groove to be fixed, and the outer side of the limiting piece is slidably accommodated in the groove. 5 . The bicycle seat tube adjustment structure according to claim 1 , wherein an upper bearing seat is arranged at the top end of the outer tube, an upper bearing is arranged in the upper bearing seat, and the inner tube passes through the upper bearing. 6 . The outer wall slidably contacts the upper bearing, the bottom end of the inner tube is provided with a lower bearing seat, the lower bearing seat is provided with a lower bearing, and the lower bearing slidably contacts the inner wall of the outer tube. 6 . The bicycle seat tube adjustment structure according to claim 5 , wherein the upper bearing and the lower bearing are self-lubricating bearings respectively, the upper bearing seat has a flange portion and a bearing portion, the convex portion is 6 . The outer diameter of the edge portion is larger than the outer diameter of the bearing portion, the bearing portion penetrates into the outer tube, the upper bearing is embedded around the inner wall of the bearing portion, and the flange portion is fastened to the inner wall of the bearing portion. A dust ring is embedded around the top edge of the outer tube and the inner wall of the flange portion, and the outer wall of the inner tube can slidably contact the dust ring to prevent dirt from entering the outer tube. 7 . The bicycle seat tube adjustment structure according to claim 5 , wherein an end plug is provided at the bottom end of the outer tube, a flange is protruded around the bottom end of the end plug, and the flange abuts against the The bottom edge of the outer tube is fixed, the end plug has an insertion hole, and a cam seat is arranged to match the insertion hole. The cam seat includes a base and a cam bracket connected to the base. The base passes through It is fixed in the insertion hole, the base has a fixing hole, the cam bracket is pivotally connected to a cam, and the cam is arranged below the fixing hole and connected with a pull rope; A fixing tube is protruded from the bottom end along the axial direction, the fixing tube is embedded in the fixing hole and fixed, a downwardly protruding air pressure release button is inserted in the fixing tube, and the bottom end of the air pressure release button abuts against the air pressure release button. the cam. 8. The bicycle seat tube adjustment structure according to claim 7, wherein an outer hole is formed around the bottom of the outer tube, a countersunk hole is formed around the end plug, and the inner and outer ends of the countersunk hole are They are respectively communicated with the insertion hole and the outer hole, a fixing screw hole is arranged around the base, and the inner and outer ends of the fixing screw hole are respectively communicated with the fixing hole and the countersunk hole, and there is a fixed screw hole. The bolt penetrates the outer hole and the countersunk head hole and is screwed into the fixing screw hole, the inner end of the bolt presses the fixing tube of the pneumatic rod body, and the pneumatic rod is screwed fixed to the bottom end of the outer tube. 9 . The bicycle seat tube adjustment structure according to claim 8 , wherein the joint part has a top through hole, the top end of the telescopic rod forms a protruding rod with a narrower diameter, and the protruding rod passes through the top A perforation is formed, and a part of the protruding rod passing through the top perforation is screwed with a fixing nut, so that the top end of the telescopic rod is combined with the joint part. 10 . The bicycle seat tube adjustment structure according to claim 9 , wherein the top end of the inner tube is connected to a top seat, and the top seat is connected with a seat cushion fixing component through screws, and the seat cushion fixing component is 10 . For fixing bicycle saddles.

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