Inner claw type taper interlocking structure head tube

Abstract

The utility model discloses an inner claw type taper interlocking structure head tube which comprises an upper head tube, a lower base, a locking handle, an inner tongue block, a pull ring, a pin shaft, a connecting shaft and an eccentric wheel, and the upper head tube, the lower base and the locking handle are rotationally connected. A conical table is arranged at one end of the upper head pipe, and a plurality of claw heads arranged at intervals are further arranged at the bottom of the conical table. The lower base is of a circular-tube-shaped structure, the end of the lower base is provided with a lower claw head staggered with the multiple claw heads, a clamping groove cavity is formed when the multiple claw heads and the lower claw head are folded, and grooves are formed in the middles of the multiple claw heads and the middle of the lower claw head respectively to form clamping grooves; one end of the pull ring is connected with the locking handle and provided with an eccentric wheel, and the other end is connected with the inner tongue block; the locking handle rotates to drive the eccentric wheel to rotate, the eccentric wheel rotates to drive the pull ring to move so as to drive the inner tongue block to move in the clamping groove cavity, and the edge of the inner tongue block extends into and out of the clamping groove. The detachable and foldable head tube can be firmly and reliably connected, and is convenient and easy to use during disassembly.

Description

A type of internal claw tapered interlocking head tube Technical Field

[0001] This utility model relates to the technical field of bicycle frames, and in particular to an internal claw type tapered interlocking head tube. Background Technology

[0002] The head tube is the front section of a bicycle frame, primarily connecting directly or indirectly to the handlebars and fork at both ends. This connection can be fixed or detachable and foldable. In detachable and foldable connection structures, the strength of the connection is a crucial design consideration, as it requires not only a secure connection but also ease of disassembly and folding. Summary of the Invention

[0003] The purpose of this invention is to optimize the structure of the detachable and foldable head tube in the prior art and to propose an internal claw type tapered interlocking head tube structure, which can make the detachable and foldable head tube firmly and reliably connected and convenient to disassemble.

[0004] To achieve the above objectives, this utility model proposes an internal claw-type tapered interlocking head tube, including an upper head tube, a lower base, a locking handle, an inner tongue block, a pull ring, a pin, a connecting shaft, and an eccentric wheel. The upper head tube, lower base, and locking handle are rotatably connected. One end of the upper head tube has a conical platform, which is hollow inside. A left and right ear seat are located on one side of the conical platform, with an ear seat space between them. The bottom of the conical platform also has multiple spaced claw heads, each with an inwardly curved claw hook. The lower base is a cylindrical structure. One end of the lower base has a left and right ear plate, which are respectively fitted into the left and right ear seats within the ear seat space. A handle space is located between the left and right ear plates. The base end is provided with a lower claw head that is staggered with multiple claw heads. When the multiple claw heads and the lower claw heads are closed, they form a slot cavity. The middle part of the multiple claw heads and the lower claw heads are respectively provided with grooves to form slots. One end of the locking handle is located in the handle space. One end of the pull ring is connected to the locking handle and is provided with an eccentric wheel. The other end is connected to the inner tongue block. The shape of the inner tongue block is configured as an outwardly convex arc block to match the slot cavity. The outwardly convex arc of the inner tongue block faces the slot cavity. The rotation of the locking handle drives the eccentric wheel to rotate. When the eccentric wheel rotates, it drives the pull ring to move, thereby driving the inner tongue block to move in the slot cavity. The edge of the inner tongue block extends in and out of the slot. The pin passes through the pin through hole on the left ear seat, left ear plate, locking handle, eccentric wheel, right ear plate, and right ear seat. The connecting shaft passes through the connecting shaft hole on the locking handle and eccentric wheel.

[0005] In this design, the upper tube and lower base are rotatably connected by a pin. During connection, the three claws of the upper tube and the three claw slots of the lower base are correspondingly inserted. The three claws of the upper tube are arranged in an isosceles triangle. The claw hooks on the claws bend upwards towards the center of the upper tube to form a slot cavity that matches the shape of the inner tongue block. The slot cavity is hollow in the middle. The slot cavity has grooves formed at the bending points of the three claw hooks and at the middle of the interval between the three claw slots. All the grooves are combined to form a slot. After the upper tube and lower base are rotatably connected, the rotating locking handle is rotated around the pin. Under the action of the eccentric wheel, the pull ring moves towards the slot cavity and moves the inner tongue block together. The inner tongue block is an outwardly convex arc-shaped block, and its front end is inserted into the slot. To disengage, the locking handle is first rotated in the opposite direction around the pin. Under the action of the eccentric wheel, the pull ring moves away from the slot cavity and moves the inner tongue block together. The inner tongue block disengages from the slot, and then the upper tube and lower base can be rotatably separated.

[0006] As a preferred embodiment of this utility model, the upper tube has a positioning hole near the conical platform on its side. The locking handle has a locking hook, a torsion spring, and a button. The locking hook engages with the positioning hole and is right-angled. The inner side of the locking handle facing the upper tube has an inwardly recessed locking hook groove. The locking hook is located in the locking hook groove and is rotatably connected to the locking handle via a locking hook pin. The locking hook pin is fixed to the locking handle by a set screw. The torsion spring is sleeved on the locking hook pin. One end of the torsion spring presses against the bottom of the locking hook groove, and the other end presses against the locking hook. The outer side of the locking handle away from the upper tube has a button. One end of the button protrudes from the outer side, and the other end passes through the locking handle and is close to one end of the locking hook. The locking hook of this design works in conjunction with the positioning hole. When the locking handle locks the upper tube and the lower base, the locking hook can enter the positioning hole and lock in place. When the locking hook enters, it can rotate and reset under the action of the torsion spring, locking the positioning hole wall to prevent the locking handle from loosening. When it is necessary to open, press the button to make the locking hook rotate and disengage from the positioning hole. After pulling out the locking handle, release the button, and the locking hook will reset under the action of the torsion spring.

[0007] In a preferred embodiment of this utility model, the locking handle includes a gripping part and a rotating shaft end. The left and right ear plates are respectively attached to both sides of the rotating shaft end, and a pull ring groove is provided in the middle of the rotating shaft end. One end of the pull ring is located in the pull ring groove and has a through hole, and the eccentric wheel is located in the through hole. This embodiment is a connection structure between the pull ring and the locking handle. The eccentric wheel and the locking handle rotate together under the connection of a shaft. When the eccentric wheel rotates, since its rotation center axis is a pin, and the pin hole is not in the center of the eccentric wheel, it is equivalent to a cam rotating, thereby driving the pull ring to swing and extend / retract. The inner tongue block connected to the pull ring then moves in a telescoping / retracting motion.

[0008] In a preferred embodiment of this utility model, the pull ring and the inner tongue block are respectively provided with corresponding internal threaded holes. The pull ring and the inner tongue block are connected to each other by a fine-tuning screw. A compression spring is provided in the internal threaded hole of the inner tongue block. In this embodiment, the inner tongue block is connected to the pull ring by the fine-tuning screw, which also transmits a small amplitude of oscillation. Therefore, the slot can be made into a flared mouth, or a compression spring can be installed to eliminate the oscillation effect and ensure that the inner tongue block can move telescopically within the slot. The compression spring is set in the internal threaded hole of the inner tongue block and connected to the fine-tuning screw. When locked, the front end of the compression spring is pressed against the inner groove of the upper tube claw.

[0009] In a preferred embodiment of this utility model, the lower base is provided with a locking bolt, and the annular tube wall of the lower base has an opening slit. Bolt through holes and threaded holes are respectively provided on the annular tube walls on both sides of the opening slit. The locking bolt passes through the bolt through holes and threaded holes, connecting and tightening the annular tube walls on both sides of the opening slit. This lower base can connect to other pipe fittings. During connection, the opening slit increases the lower base's flexibility. After the lower base is fitted onto other pipe fittings, the locking bolt is used to tighten the opening slit, thus ensuring the lower base is securely fitted onto the other pipe fittings.

[0010] As a preferred embodiment of this utility model, the bottom of the conical platform is provided with three spaced claw heads, and the inner wall of the lower base is provided with two lower claw heads that are spaced apart from the claw heads.

[0011] As a preferred embodiment of this utility model, the claw groove on the lower base is formed by two lower claw heads protruding from the end face of the lower base, and the lower claw heads are spaced apart from the claw heads of the upper tube.

[0012] As a preferred embodiment of this utility model, the bottom of the conical platform is provided with three spaced claw heads, and the end face of the lower base is provided with two outwardly protruding lower claw heads, which are spaced together with the claw heads of the upper tube.

[0013] As a preferred embodiment of this utility model, the bottom of the conical platform is provided with two corresponding claw heads on both sides, and the end face of the lower base is provided with an outwardly protruding lower claw head, and the lower claw head is configured to cooperate with the two claw heads of the upper tube at intervals.

[0014] The above are three types of mating structures for the upper tube and the lower base claw head. Other different structures can also be used. The purpose is to lock the upper tube and the lower base together so that they cannot move when the inner tongue block moves into the slot.

[0015] In a preferred embodiment of this invention, the inner claw tapered interlocking head tube is connected to the bicycle handlebars and front fork. The inner claw tapered interlocking head tube in this embodiment is a connecting structure at the front of the bicycle.

[0016] The beneficial effects of this utility model are that it enables the detachable and foldable head tube to be firmly and reliably connected, and to be convenient and easy to disassemble.

[0017] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the structure of this utility model from one perspective.

[0019] Figure 2 is a schematic diagram of the structure exploded as shown in Figure 1.

[0020] Figure 3 is an exploded view of the structure of this utility model from another perspective.

[0021] Figure 4 is a cross-sectional structural diagram of this utility model.

[0022] Figure 5 is a structural schematic diagram of the locking handle of this utility model.

[0023] Figure 6 is a structural schematic diagram of the upper tube and lower base of this utility model.

[0024] Figure 7 is a schematic diagram of another structure of the lower base of this utility model.

[0025] Figure 8 is a schematic diagram of another structure of the upper tube and lower base of this utility model.

[0026] In the diagram: 1-Upper head tube; 2-Lower base; 3-Locking handle; 4-Inner tongue block; 5-Pull ring.

[0027] 6-Pin shaft 7-Coupling shaft 8-Eccentric wheel 9-Groove 11-Conical platform

[0028] 12-Left ear seat 13-Right ear seat 14-Claw head 15-Positioning hole 21-Left ear plate

[0029] 22-Right ear plate; 24-Locking bolt; 25-Opening slot; 26-Through bolt hole

[0030] 27-Threaded hole; 28-Lower claw head; 31-Locking hook; 32-Torsion spring

[0031] 33-Button; 34-Hook groove; 35-Hook pin; 36-Set screw

[0032] 37-Grip part; 38-Spindle end; 39-Pull ring groove; 41-Compression spring; 51-Through hole

[0033] 52 - Fine-tuning screw; 101 - Pin shaft through hole; 102 - Coupling hole. Detailed Implementation

[0034] Referring to Figures 1-7, this utility model provides the following technical solution:

[0035] A head tube with an internal claw-type tapered interlocking structure includes an upper head tube 1, a lower base 2, a locking handle 3, an inner tongue block 4, a pull ring 5, a pin 6, a connecting shaft 7, and an eccentric wheel 8. The upper head tube 1, lower base 2, and locking handle 3 are rotatably connected. One end of the upper head tube 1 has a conical platform 11, which is hollow inside. A left ear seat 12 and a right ear seat 13 are located on one side of the platform, with an ear seat space between them. The bottom of the platform 11 also has multiple spaced claw heads 14, each with an inwardly curved claw hook 15. The lower base 2 is a cylindrical structure. One end of the lower base 2 has a left ear plate 21 and a right ear plate 22, which are respectively fitted into the left ear seat 12 and right ear seat 13 within the ear seat space. A handle space is located between the left ear plate 21 and right ear plate 22. The lower base 2 also has a handle space between it and the multiple claw heads 14. The lower claws 28 of the multiple claws 14 are staggered. When the multiple claws 14 and the lower claws 28 are closed, they form a slot cavity. The middle part of the multiple claws 14 and the lower claws 28 are respectively provided with grooves 9 to form slots. One end of the locking handle 3 is located in the handle space. One end of the pull ring 5 is connected to the locking handle 3 and is provided with an eccentric wheel 8. The other end is connected to the inner tongue block 4. The inner tongue block 4 is shaped to match the slot cavity and is set as an outwardly convex arc block. The outwardly convex arc of the inner tongue block 4 faces the slot cavity. When the locking handle 3 rotates, it drives the eccentric wheel 8 to rotate. When the eccentric wheel 8 rotates, it drives the pull ring 5 to move, thereby driving the inner tongue block 4 to move in the slot cavity. The edge of the inner tongue block 4 extends in and out of the slot. The pin 6 passes through the pin through hole 101 on the left ear seat 12, the left ear plate 21, the locking handle 3, the eccentric wheel 8, the right ear plate 22, and the right ear seat 13. The connecting shaft 7 passes through the connecting shaft hole 102 on the locking handle 3 and the eccentric wheel 8.

[0036] A positioning hole 15 is provided on the side of the upper tube 1 near the conical platform 11. The locking handle 3 is provided with a locking hook 31, a torsion spring 32, and a button 33. The locking hook 31 cooperates with the positioning hole 15 and is right-angled. The inner side of the locking handle 3 facing the upper tube 1 is provided with an inwardly recessed locking hook groove 34. The locking hook 31 is located in the locking hook groove 34 and is rotatably connected to the locking handle 3 through a locking hook pin 35. The locking hook pin 35 is fixed to the locking handle 3 by a set screw 36. The torsion spring 32 is sleeved on the locking hook pin 35. One end of the torsion spring 32 presses against the bottom of the locking hook groove 34, and the other end presses against the locking hook 31. A button 33 is provided on the outer side of the locking handle 3 away from the upper tube 1. One end of the button 33 protrudes from the outer side, and the other end passes through the locking handle 3 and is close to one end of the locking hook 31.

[0037] The locking handle 3 includes a gripping part 37 and a rotating shaft end 38. The left ear plate 21 and the right ear plate 22 are respectively attached to the two sides of the rotating shaft end 38. A pull ring groove 39 is provided in the middle of the rotating shaft end 38. One end of the pull ring 5 is located in the pull ring groove 39 and has a through hole 51. The eccentric wheel 8 is located in the through hole 51.

[0038] The pull ring 5 and the inner tongue block 4 are respectively provided with corresponding internal threaded holes. The pull ring 5 and the inner tongue block 4 are connected to each other by a fine-tuning screw 52. The inner tongue block 4 is provided with a compression spring 41 in the internal threaded hole.

[0039] The lower base 2 is provided with a locking bolt 24. The annular tube wall of the lower base 2 is provided with an opening slit 25. The annular tube walls on both sides of the opening slit 25 are respectively provided with bolt through holes 26 and threaded holes 27. The locking bolt 24 passes through the bolt through holes 26 and the threaded holes 27 to connect and tighten the annular tube walls on both sides of the opening slit 25.

[0040] The bottom of the conical platform 11 is provided with three spaced claw heads 14, and the inner wall of the lower base 2 is provided with two lower claw heads 28 that are spaced apart from the claw heads 14.

[0041] As shown in Figure 7, the bottom of the conical platform 11 is provided with three spaced claw heads 14, and the end face of the lower base 2 is provided with two outwardly protruding lower claw heads 28. The lower claw heads 28 are spaced and matched with the claw heads 14 of the upper tube 1.

[0042] As shown in Figure 8, the bottom of the conical platform 11 has two corresponding claw heads 14 on both sides, and the end face of the lower base 2 has a protruding lower claw head 28. The lower claw head 28 is spaced and matched with the two claw heads 14 of the upper tube 1.

[0043] The head tube is connected to the bicycle handlebars and front fork by an internal claw-type tapered interlocking structure.

[0044] The working process of this utility model:

[0045] During connection, rotate the upper tube 1 or the lower base 2 until the claw 14 of the upper tube 1 and the lower claw 28 of the lower base are engaged, and all the grooves 9 of the slot cavity are combined to form a slot. After the upper tube 1 and the lower base 2 are connected by rotation, rotate the locking handle 3 around the pin 6. The locking handle 3 drives the eccentric wheel 8 to rotate together through the connecting shaft 7. Under the action of the eccentric wheel 8, the pull ring 5 moves towards the slot cavity and drives the inner tongue block 4 to move together. The front end of the inner tongue block 4 is inserted into the slot, locking the upper tube 1 and the lower base 2 into position. When disconnecting, first rotate the locking handle 3 in the opposite direction around the pin 6. Under the action of the eccentric wheel 8, the pull ring 5 moves away from the slot cavity and drives the inner tongue block 4 to move together. The inner tongue block 4 disengages from the slot, and then the upper tube 1 and the lower base 2 can be rotated and separated.

[0046] When the locking handle 3 locks the upper tube 1 and the lower base 2, the locking hook 31 can enter the positioning hole 15 and lock in place. When the locking hook 31 enters, it can rotate and reset under the action of the torsion spring 32 to lock in place against the positioning hole wall, preventing the locking handle 3 from being released. When it is necessary to open, press the button 33 to make the locking hook 31 rotate and disengage from the positioning hole 15. After pulling out the locking handle 3, release the button 33, and the locking hook 31 will reset under the action of the torsion spring 32.

[0047] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A head tube with an internal claw-type tapered interlocking structure, characterized in that: The device includes an upper tube, a lower base, a locking handle, an inner tongue block, a pull ring, a pin, a connecting shaft, and an eccentric wheel. The upper tube, lower base, and locking handle are rotatably connected. One end of the upper tube has a conical platform, which is hollow inside. A left and right ear seat are located on one side of the conical platform, with an ear seat space between them. The bottom of the conical platform also has multiple spaced claw heads, each with an inwardly curved hook. The lower base is a cylindrical structure. One end of the lower base has a left and right ear plate, which are respectively fitted into the left and right ear seats within the ear seat space. A handle space is located between the left and right ear plates. The end of the lower base has multiple claw heads arranged in an alternating pattern. The lower claw head, when multiple claw heads are closed, forms a slot cavity. The middle portions of the multiple claw heads and the lower claw head are respectively provided with grooves to form slots. One end of the locking handle is located within the handle space. One end of the pull ring is connected to the locking handle and is provided with an eccentric wheel; the other end is connected to the inner tongue block. The inner tongue block is shaped to match the slot cavity and is configured as an outwardly convex arc-shaped block. The outwardly convex arc of the inner tongue block faces the slot cavity. The rotation of the locking handle drives the eccentric wheel to rotate, and when the eccentric wheel rotates, it drives the pull ring to move, thereby moving the inner tongue block within the slot cavity. The edge of the inner tongue block extends into and out of the slot. The pin passes through the pin through holes on the left ear seat, left ear plate, locking handle, eccentric wheel, right ear plate, and right ear seat. The connecting shaft passes through the connecting shaft holes on the locking handle and eccentric wheel.

2. The head tube with an internal claw-type tapered interlocking structure as described in claim 1, characterized in that: The upper tube has a positioning hole near the conical platform on its side. The locking handle has a locking hook, a torsion spring, and a button. The locking hook engages with the positioning hole and is right-angled. The inner side of the locking handle facing the upper tube has an inwardly recessed locking hook groove. The locking hook is located in the locking hook groove and is rotatably connected to the locking handle via a locking hook pin. The locking hook pin is fixed to the locking handle by a set screw. The torsion spring is sleeved on the locking hook pin. One end of the torsion spring presses against the bottom of the locking hook groove, and the other end presses against the locking hook. The outer side of the locking handle away from the upper tube has a button. One end of the button protrudes from the outer side, and the other end passes through the locking handle and is close to one end of the locking hook.

3. The head tube with an internal claw-type tapered interlocking structure as described in claim 1, characterized in that: The locking handle includes a gripping part and a rotating shaft end. The left ear plate and the right ear plate are respectively attached to the two sides of the rotating shaft end. A pull ring groove is provided in the middle of the rotating shaft end. One end of the pull ring is located in the pull ring groove and has a through hole. The eccentric wheel is located in the through hole.

4. The head tube with an internal claw-type tapered interlocking structure as described in claim 1, characterized in that: The pull ring and the inner tongue block are respectively provided with corresponding internal threaded holes. The pull ring and the inner tongue block are connected to each other by a fine-tuning screw. A compression spring is provided in the internal threaded hole of the inner tongue block.

5. The head tube with an internal claw-type tapered interlocking structure as described in claim 1, characterized in that: The lower base is provided with a locking bolt, and the annular tube wall of the lower base is provided with an opening slit. The annular tube wall on both sides of the opening slit is provided with a bolt through hole and a threaded hole, respectively. The locking bolt passes through the bolt through hole and the threaded hole and connects to tighten the annular tube wall on both sides of the opening slit.

6. The head tube with an internal claw-type tapered interlocking structure as described in claim 1, characterized in that: The bottom of the conical platform is provided with three spaced claw heads, and the inner wall of the lower base is provided with two lower claw heads that are spaced apart from the claw heads.

7. The head tube with an internal claw-type tapered interlocking structure as described in claim 1, characterized in that: The bottom of the conical platform is provided with three spaced claw heads, and the end face of the lower base is provided with two outwardly protruding lower claw heads, which are spaced together with the claw heads of the upper tube.

8. The head tube with an internal claw-type tapered interlocking structure as described in claim 1, characterized in that: The bottom of the conical platform is provided with two corresponding claw heads on both sides, and the end face of the lower base is provided with an outward protruding lower claw head. The lower claw head is configured to cooperate with the two claw heads of the upper tube at intervals.

9. A head tube with an internal claw-type tapered interlocking structure as described in any one of claims 1-8, characterized in that: The aforementioned internal claw tapered interlocking structure connects the head tube to the bicycle handlebars and front fork.

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