A quick disassembly and assembly structure for a bicycle front fork and stem

Abstract

The invention discloses a quick disassembly and assembly structure of a front fork and a stem of a bicycle, comprising a handlebar, an axle bowl, a front fork and a frame head tube. An "L"-shaped guide slot is formed on the side wall of the lower end of the handlebar stem tube, an arc portion lower than the horizontal end is formed at the top of the horizontal end of the "L"-shaped guide slot, a stud is sleeved on the middle part of the outer wall of the handlebar stem tube, a ring groove is formed on the inner wall of the lower end of the stud, so that an annular cavity is formed between the lower end of the stud and the outer wall of the handlebar stem tube, a bayonet protruding from the inner wall surface of the front fork is arranged in the middle part of the front fork stem tube, the axle bowl is sleeved on the upper part of the frame head tube, the front fork penetrates into the frame head tube from the lower part, the handlebar stem tube is inserted into the inner cavity of the front fork from the upper part of the frame head tube, so that the bayonet pin is introduced into the "L"-shaped guide slot, the handlebar is rotated so that the bayonet pin is clamped in the arc portion of the guide slot, and the top end of the front fork stem tube is just clamped in the annular groove at the lower part of the stud. The front fork, the handlebar and the frame head tube of the invention can be manually quickly disassembled and assembled, and the operation is convenient, the structure is simple and the function is reliable.

Description

Technical Field

[0001] The invention relates to a stem installation structure, in particular to a quick disassembly structure of a front fork and stem of a bicycle. Background Art

[0002] Traditional bicycle front forks are connected to the frame by threaded compression bearing bowls, and the handlebars are fixed to the front forks by screw bevels or screws. Both disassembly and assembly require special tools, which increases manpower and material costs and brings inconvenience to assembly. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a quick disassembly structure of a front fork and a stem of a bicycle, which can quickly separate the front fork, the stem and the frame manually without using special tools and has stable and reliable functions after assembly.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a quick disassembly structure of a front fork and a stem of a bicycle, comprising a stem, a shaft cup, a front fork, and a head tube of a frame, an "L"-shaped guide slot is opened on the side wall of the lower end of the stem tube, a circular arc portion lower than the horizontal end is formed at the top of the horizontal end of the "L"-shaped guide slot, a stud is sleeved on the middle part of the outer wall of the stem tube, a ring groove is formed on the inner wall of the lower end of the stud, so that an annular cavity is formed between the lower end of the stud and the outer wall of the stem tube, and the front fork is provided with an "L"-shaped guide slot. A bayonet protruding from the inner wall surface of the front fork is provided in the middle of the fork stem, the axle cup is sleeved on the top of the frame head tube, the front fork is inserted into the frame head tube from below, and the stem stem is inserted into the inner cavity of the front fork from above the frame head tube, so that the bayonet pin is guided into the "L"-shaped guide groove, and the stem is rotated so that the bayonet pin is stuck in the arc part of the guide groove, and the top end of the front fork stem is just stuck in the annular groove at the bottom of the stud, and a nut is sleeved on the stem stem, and the nut is tightened on the stud, thereby pressing the axle cup and making the bayonet pin clamped in the arc part of the guide groove.

[0005] A positioning hole is formed on the side wall of the lower end of the stem tube, and a reinforcing sleeve is inserted into the inner side of the lower end of the stem tube. The reinforcing sleeve is provided with an "L"-shaped auxiliary guide groove and an auxiliary positioning hole corresponding to the "L"-shaped guide groove and the positioning hole on the stem tube. The reinforcing sleeve is fixed to the inner wall of the stem tube by installing screws through the positioning hole and the auxiliary positioning hole.

[0006] The stud is fixed to the stem by a pair of rivets or screws.

[0007] A spacer is inlaid in the shaft bowl, and a circle of guide platform is arranged on the spacer. When the nut is locked, the guide platform is just stuck into the inner cavity of the nut to limit the radial displacement of the frame head pipe and the stem.

[0008] A through hole is arranged in the middle of the front fork riser, and the bayonet pin protrudes from the surface of the inner wall of the front fork by being screwed into the through hole.

[0009] The beneficial effects of the present invention are: low cost, simple structure, easy operation, and convenient disassembly and assembly as well as functional reliability after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is an assembly diagram of the front fork and the handlebar quick disassembly and assembly structure of the bicycle of the present invention.

[0011] Figure 2 The invention discloses an exploded view of a quick disassembly structure of a front fork and a handlebar of a bicycle.

[0012] Figure 3 The invention is a diagram of the internal structure of the front fork and stem quick disassembly and assembly structure of the bicycle after the assembly is completed.

[0013] Figure 4 It is a partial enlarged view of the exploded view of the quick disassembly structure of the front fork and the stem of the bicycle of the present invention. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0015] like Figure 1-4 As shown, the front fork and stem quick disassembly and assembly structure of the bicycle of the present invention comprises a stem 1, a shaft bowl 5, a front fork 7, and a frame head tube 10. An "L"-shaped guide slot 1-1 is opened on the side wall of the lower end of the stem 1, and an arc portion 1-3 lower than the horizontal end is formed at the top of the horizontal end of the "L"-shaped guide slot 1-1. A stud 3 is sleeved in the middle of the outer wall of the stem 1, and a ring groove 3-1 is formed on the inner wall of the lower end of the stud 3, so that an annular cavity is formed between the lower end of the stud 3 and the outer wall of the stem 1. A protruding inner wall of the front fork 7 is provided in the middle of the stem 1. The surface of the bayonet 6, the shaft cup 5 is inserted above the frame head tube 10, the front fork 7 is inserted into the frame head tube 10 from the bottom, the stem 1 is inserted into the inner cavity of the front fork 7 from the top of the frame head tube 10, so that the bayonet 6 is introduced into the "L"-shaped guide groove 1-1, the stem is rotated to make the bayonet 6 stuck in the arc portion 1-3 of the guide groove, and the top of the stem of the front fork 7 is just stuck in the annular groove 3-1 at the bottom of the stud 3, and a nut 2 is sleeved on the stem 1, and the nut 2 is tightened on the stud 3, thereby pressing the shaft cup 5 and making the bayonet 6 stuck in the arc portion 1-3 of the guide groove.

[0016] Preferably, a positioning hole 1-2 is formed on the side wall of the lower end of the stem 1, and a reinforcing sleeve 9 is inserted into the inner side of the lower end of the stem 1. The reinforcing sleeve 9 is provided with an "L"-shaped auxiliary guide groove 9-1 and an auxiliary positioning hole corresponding to the "L"-shaped guide groove 1-1 and the positioning hole 1-2 on the stem 1, and the reinforcing sleeve 9 is fixed to the inner wall of the stem 1 by installing screws 9-2 through the positioning hole 1-2 and the auxiliary positioning hole.

[0017] Preferably, the stud 3 is fixed to the stem 1 by a pair of rivets or screws 8 .

[0018] Preferably, a spacer sleeve 4 is embedded in the shaft bowl 5 , and a guide platform 4 - 1 is formed on the spacer sleeve 4 . When the nut 2 is tightened, the guide platform 4 - 1 is just inserted into the inner cavity of the nut 2 , thereby limiting the radial displacement of the frame head tube 10 and the stem 1 .

[0019] Preferably, a through hole is provided in the middle of the seat tube of the front fork 7, and the bayonet 6 protrudes from the surface of the inner wall of the front fork by being screwed into the through hole.

[0020] After the present invention is assembled, the upper handlebar portion of the stem is parallel to the front fork wheel axle, and the nut 2 is rotated to press the spacer 4. The studs 3 are inserted into the stem 1 in sequence, and the screws or rivets 8 fix the studs 3. The lower end of the stem 1 is provided with an "L"-shaped guide groove and positioning holes 1-2, which correspond to the auxiliary "L"-shaped guide groove 9-1 and the auxiliary positioning holes on the reinforcement sleeve 9, and are fixed together by installing screws 9-2; the bayonet 6 is fixed on the front fork 7; and the shaft cup 5 is inlaid with the spacer 4.

[0021] First, the front fork 7 is inserted into the frame head tube 10 from the bottom; secondly, the shaft cup 5 embedded with the spacer 4 is inserted from the top of the front fork 7; thirdly, the stem 1 is rotated at a certain angle, the opening position of the "L"-shaped guide slot 1-1 is aligned with the bayonet 6, and the bayonet 6 is inserted into the inner cavity of the front fork 7 from the top, and the stem 1 is rotated and pulled up so that the bayonet 6 is inserted into the arc portion 1-3 at the end of the slot; finally, the nut 2 is rotated to tighten the spacer 4 to complete the assembly. The bayonet 6 is inserted into the arc portion 1-3 at the end of the "L"-shaped guide slot 1-1 at the lower end of the stem 1 to prevent the front fork 7 and the stem 1 from rotating relative to each other; the stud ring groove 3-1 is inserted into the top of the front fork 7 to limit the radial displacement of the front fork 7 and the stem 1. The guide platform 4-1 of the spacer 4 is inserted into the inner cavity of the nut to limit the radial displacement of the frame head tube 10 and the stem 1.

[0022] The present invention adopts a rotating card pin shaft positioning mechanism to prevent the two from generating relative movement; the thread is tightened to ensure a firm connection and prevent the card position from loosening; and the guide card slot eliminates radial runout.

[0023] The embodiments described above are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited only by these embodiments, that is, any equivalent changes or modifications made to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A quick disassembly structure of a front fork and a stem of a bicycle, comprising a stem (1), a shaft cup (5), a front fork (7), and a head pipe (10) of a frame, characterized in that: An "L"-shaped guide slot (1-1) is formed on the side wall of the lower end of the stem (1), and an arc portion (1-3) lower than the horizontal end is formed at the top of the horizontal end of the "L"-shaped guide slot (1-1). A stud (3) is sleeved in the middle of the outer wall of the stem (1), and a ring groove (3-1) is formed on the inner wall of the lower end of the stud (3), so that an annular cavity is formed between the lower end of the stud (3) and the outer wall of the stem (1). A bayonet (6) protruding from the inner wall surface of the front fork (7) is provided in the middle of the stem. The shaft cup (5) is sleeved on the top of the head tube (10) of the frame, and the front fork (7) The frame head tube (10) is inserted from below, and the stem (1) stem tube is inserted from above the frame head tube (10) into the inner cavity of the front fork (7), so that the bayonet (6) is guided into the "L"-shaped guide slot (1-1), and the stem is rotated so that the bayonet (6) is clamped in the arc portion (1-3) of the guide slot, and the top end of the stem tube of the front fork (7) is just clamped in the annular groove (3-1) at the bottom of the stud (3), and a nut (2) is sleeved on the stem (1) stem tube, and the nut (2) is screwed on the stud (3), thereby pressing the shaft cup (5) and making the bayonet (6) clamped in the arc portion (1-3) of the guide slot; A positioning hole (1-2) is formed on the side wall of the lower end of the stem (1), and a reinforcing sleeve (9) is inserted into the inner side of the lower end of the stem (1). The reinforcing sleeve (9) is provided with an "L"-shaped auxiliary guide groove (9-1) and an auxiliary positioning hole corresponding to the "L"-shaped guide groove (1-1) and the positioning hole (1-2) on the stem (1). The reinforcing sleeve (9) is fixed to the inner wall of the stem (1) by installing screws (9-2) through the positioning hole (1-2) and the auxiliary positioning hole. The stud (3) is fixed to the stem (1) via a pair of rivets or screws (8).

2. The front fork and stem quick disassembly and assembly structure of a bicycle according to claim 1, characterized in that: The shaft bowl (5) is inlaid with a spacer (4), and a circle of guide platform (4-1) is provided on the spacer (4). When the nut (2) is locked, the guide platform (4-1) is just inserted into the inner cavity of the nut (2), thereby limiting the radial displacement of the frame head tube (10) and the stem (1).

3. The front fork and stem quick disassembly and assembly structure of a bicycle according to claim 1, characterized in that: A through hole is provided in the middle of the front fork (7) stand pipe, and the bayonet (6) protrudes from the surface of the inner wall of the front fork by being screwed into the through hole.

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