Tower footing clamp

Abstract

The utility model provides a tower footing clamp, which relates to the technical field of bicycles, and comprises a mounting seat, a main shaft and a telescopic positioning mechanism, the mounting seat is used for being fixedly connected with a rotary table of a five-axis machining center; the telescopic positioning mechanism comprises a limiting part, a fixing seat and an elastic part, the fixing seat is fixedly connected with the mounting seat, a first positioning surface and a second positioning surface are arranged in the fixing seat, and the limiting part is arranged between the main shaft and the fixing seat in a sleeving manner and is provided with an abutting part and a limiting part; the elastic piece abuts against the limiting piece so that the abutting portion can be switched between abutting against the first positioning face and abutting against the second positioning face, and correspondingly the limiting piece can stretch out or retract along the fixing base. One end of the main shaft is connected with the mounting seat, the other end of the main shaft is provided with an assembly hole, and the tower footing is configured to be locked with the assembly hole through a fastener after the assembly groove and the limiting part are embedded and limited, so that processing and positioning of the tower footing are realized, and the problems of heavy weight and single appearance of the existing tower footing are solved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and more specifically, to a bicycle base clamp. Background Technology

[0002] Because forged wheels offer advantages over cast wheels, such as higher safety, better strength, and superior surface quality, most existing bicycle hubs use forged freehub bodies. The structure of the forged freehub body is based on... Figure 9 As shown, the main body of the freewheel base is cylindrical, with multiple protrusions formed along its circumference on its outer surface. Adjacent protrusions form mounting grooves for fitting the flywheel. Typically, the freewheel base can be assembled after surface treatment. However, freewheel bases produced in this way are relatively heavy. Furthermore, due to the cylindrical shape and the mounting grooves on its outer surface, machining and positioning are difficult. Therefore, during manufacturing, only color and surface treatment can be modified, not the shape or texture, resulting in a monotonous appearance. Utility Model Content

[0003] This utility model discloses a tower base clamp, which aims to improve the problems of large weight and monotonous appearance of existing tower bases.

[0004] The present invention adopts the following solution:

[0005] A tower base fixture includes a mounting base, a spindle, and a telescopic positioning mechanism. The mounting base is fixedly connected to the turntable of a five-axis machining center. The telescopic positioning mechanism includes a limiting member, a fixed seat, and an elastic member. The fixed seat is fixedly connected to the mounting base and has a first positioning surface and a second positioning surface. The limiting member is sleeved between the spindle and the fixed seat and has an abutting portion and a limiting portion. The elastic member is abutting against the limiting member so that the abutting portion can switch between abutting against the first positioning surface and abutting against the second positioning surface, correspondingly causing the limiting member to extend or retract along the fixed seat. One end of the spindle is connected to the mounting base, and the other end has an assembly hole. The tower base is configured to be locked to the assembly hole by fasteners after being fitted and limited by the assembly slot and the limiting portion.

[0006] As a further improvement, an inner hole for fitting the main shaft is provided through the center of the limiting member, and the limiting part consists of multiple ribs provided along the side wall of the inner hole.

[0007] As a further improvement, the spindle has a boss for fixed connection with the mounting base, and the elastic element is sleeved on the spindle and abuts against the rib and the boss.

[0008] As a further improvement, a stepped hole is arranged along the center of the fixing base, the stepped hole is arranged through from the bottom of the fixing base to the top of the fixing base, the first positioning surface and the second positioning surface are formed on different steps, and the abutting portion is switched from abutting against the first positioning surface to abutting against the second positioning surface by pressing and rotating the limiting piece.

[0009] As a further improvement, the stepped hole comprises a positioning hole and a positioning groove, the first positioning surface is formed in the positioning hole, and the second positioning surface is formed in the positioning groove, wherein the positioning groove is recessed inward along the inner wall of the positioning hole.

[0010] As a further improvement, the positioning hole has two opposite straight surfaces, and the positioning groove is triangularly recessed inward along the straight surfaces and communicates with the bottom surface of the fixing base.

[0011] As a further improvement, the positioning groove has two and is centrally symmetrically arranged.

[0012] As a further improvement, the bottom of the limiting piece outwardly extends to form the abutting portion, the cross section of the abutting portion is square, and the abutting portion is provided with a round corner on each of four corners of the square.

[0013] As a further improvement, the main shaft comprises an inner shaft and an outer shaft, the outer shaft is sleeved on the outside of the inner shaft, one end of the inner shaft is provided with a first flange matched with the mounting base, the other end of the inner shaft is provided with the assembly hole and extends along the outer shaft, and the outer shaft has a second flange matched with the fixing base and fixedly connected with the mounting base.

[0014] As a further improvement, the fastener comprises a screw and a pressing block, one end of the tower base is sleeved on the outer shaft, and the other end of the tower base is connected with the assembly hole via the screw and presses the pressing block to be locked on the outer shaft.

[0015] By adopting the above technical scheme, the following technical effects can be achieved:

[0016] The tower base clamp of the present application facilitates positioning of the tower base during machining, so that the tower base after forging can remove material at positions where the material is relatively thick through machining, thereby reducing the weight of the tower base and ensuring lightweight of the hub. At the same time, the tower base surface and the raised position, i.e. the position avoiding the assembly groove, can be processed to make the appearance of the tower base more exquisite and diversified, and improve the texture of the tower base. During processing, the mounting seat is first fixed with the rotary table, then the limiting piece is driven to extend, then the assembly groove on the tower base is inserted along the limiting part to fit the limiting, and then the fastener is locked with the assembly hole. That is, the tower base is first positioned circumferentially and then locked, which can ensure accurate positioning of the tower base to ensure processing accuracy. The limiting piece is retracted after the tower base is locked to be away from the tower base, which can ensure the processing length of the tower base, and also can avoid interference between the tool and the limiting piece during processing. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 is a structure diagram of the limiting piece and the tower base fitting of one embodiment of the present application;

[0019] Figure 2 is a structure diagram of the limiting piece when retracted of one embodiment of the present application;

[0020] Figure 3 is a sectional view of the limiting piece when extended of one embodiment of the present application;

[0021] Figure 4 is a sectional view of the limiting piece when retracted of one embodiment of the present application;

[0022] Figure 5 is a structure diagram of the fixing seat of one embodiment of the present application;

[0023] Figure 6 and Figure 7 is a structure diagram of the limiting piece from different angles of one embodiment of the present application;

[0024] Figure 8 is an exploded view of one embodiment of the present application;

[0025] Figure 9 is a structure diagram of the tower base after forging of one embodiment of the present application.

[0026] icon:

[0027] 1-mounting seat;

[0028] 2-main shaft; 21-assembly hole; 22-inner shaft; 221-first flange; 23-outer shaft; 231-second flange;

[0029] 31-limiting piece; 311-abutment part; 312-limiting part; 313-inner hole; 32-fixing seat; 321-first positioning surface; 322-second positioning surface; 323-positioning hole; 324-positioning groove; 33-elastic piece;

[0030] 4-fastener; 41-screw; 42-pressing block;

[0031] 5-tower base; 51-assembly groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents the selected embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] EMBODIMENT

[0034] In combination with Figures 1 to 9The embodiment provides a tower base clamp, which comprises a mounting seat 1, a main shaft 2 and a telescopic positioning mechanism, wherein the mounting seat 1 is fixedly connected with a rotary table of a five-axis machining center; the telescopic positioning mechanism comprises a limiting piece 31, a fixed seat 32 and an elastic piece 33, the fixed seat 32 is fixedly connected with the mounting seat 1, and the fixed seat 32 is internally provided with a first positioning surface 321 and a second positioning surface 322, the limiting piece 31 is sleeved between the main shaft 2 and the fixed seat 32, and is provided with an abutting portion 311 and a limiting portion 312; the elastic piece 33 is in abutting configuration with the limiting piece 31, so that the abutting portion 311 can be switched between abutting against the first positioning surface 321 and abutting against the second positioning surface 322, thereby corresponding to make the limiting piece 31 extend or retract along the fixed seat 32; one end of the main shaft 2 is connected with the mounting seat 1, and the other end is provided with an assembly hole 21, and the tower base 5 is configured to be locked with the assembly hole 21 through a fastener 4 after being limitedly embedded in the assembly groove 51 and the limiting portion 312.

[0035] It should be noted that the tower base clamp of the embodiment is convenient for positioning the tower base 5 in the machining process, so that the tower base 5 after forging can remove materials from positions with relatively thick materials through machining, thereby reducing the weight of the tower base 5 and ensuring the light weight of the hub. Meanwhile, the tower base 5 can be processed in patterns on the surface and the protruding position, i.e. the position avoiding the assembly groove 51, so that the appearance of the tower base 5 can be more exquisite and diversified, and the texture of the tower base 5 is improved. During machining, the mounting seat 1 is first fixed with the rotary table, then the limiting piece 31 is driven to extend, then the assembly groove 51 on the tower base 5 is inserted along the limiting portion 312 to be limitedly embedded, and finally the fastener 4 is locked with the assembly hole 21. That is, the tower base 5 is first positioned in the circumferential direction and then locked, so that the positioning accuracy of the tower base 5 can be ensured to ensure the machining precision. The limiting piece 31 is retracted after the tower base 5 is locked to be away from the tower base 5, so that the machining length of the tower base 5 can be ensured, and the tool can also be prevented from interfering with the limiting piece 31 during machining.

[0036] In a preferred embodiment, an inner hole 313 for sleeving the main shaft 2 is provided through the center of the limiting piece 31, and the limiting portion 312 is a plurality of protruding ribs provided along the sidewall of the inner hole 313. Each protruding rib corresponds to the assembly groove 51 on the tower base 5 one by one, so that the positioning accuracy of the tower base 5 can be ensured. In one embodiment, the main shaft 2 has a boss for fixedly connecting with the mounting seat 1, and the elastic piece 33 is sleeved on the main shaft 2 and abuts between the protruding ribs and the boss. For example, the elastic piece 33 is a spring, a stepped hole is provided along the center of the fixed seat 32, the stepped hole is provided through from the bottom of the fixed seat 32 to the top of the fixed seat 32, the first positioning surface 321 and the second positioning surface 322 are formed on different steps, and the abutting portion 311 is switched from abutting against the first positioning surface 321 to abutting against the second positioning surface 322 by pressing and rotating the limiting piece 31.

[0037] Further, the stepped hole comprises a positioning hole 323 and a positioning groove 324, a first positioning surface 321 is formed in the positioning hole 323, and a second positioning surface 322 is formed in the positioning groove 324, wherein the positioning groove 324 is recessed inward along the inner wall of the positioning hole 323. The position of the first positioning surface 321 is higher than that of the second positioning surface 322, when the abutting portion 311 abuts against the first positioning surface 321, the limiting piece 31 is extended, at this time, the limiting portion 312 can be embedded in the tower base 5 to limit. By manually pressing and rotating the limiting piece 31, the abutting portion 311 is rotated to abut against the second positioning surface 322, so as to drive the limiting piece 31 to retract, and the corresponding limiting portion 312 is away from the tower base 5. Under the action of the elastic piece 33, the abutting portion 311 can keep the state of abutting against the first positioning surface 321 or the second positioning surface 322.

[0038] On the basis of the above-mentioned embodiments, in an optional embodiment of the utility model, the positioning hole 323 has two opposite straight surfaces, the positioning groove 324 is set to be triangular and communicates with the bottom surface of the fixing seat 32. Preferably, the positioning groove 324 has two and is centrally symmetrically arranged. The bottom of the limiting piece 31 is outwardly extended to form the abutting portion 311, the cross section shape of the abutting portion 311 is square, and the abutting portion 311 is provided with a round corner on four corners of the square. When the abutting portion 311 abuts against the first positioning surface 321, the side surface of the abutting portion 311 is limited by the two straight surfaces in the positioning hole 323, so as to avoid the rotation of the limiting piece 31. By pressing the limiting piece 31 to the position of the positioning groove 324 and rotating the limiting piece 31, two corners of the abutting portion 311 are arranged in the positioning groove 324 and are clamped with the positioning groove 324, under the action of the elastic piece 33, the limiting piece 31 keeps the retracted state.

[0039] In other embodiments, the main shaft 2 comprises an inner shaft 22 and an outer shaft 23, the outer shaft 23 is sleeved outside the inner shaft 22, one end of the inner shaft 22 is provided with a first flange 221 matched with the mounting seat 1, the other end is provided with the assembly hole 21 and extends along the outer shaft 23, and the outer shaft 23 is provided with a second flange 231 matched with the fixing seat 32 and fixedly connected with the mounting seat 1. Wherein, the one end of the inner shaft 22 provided with the first flange 221 protrudes out of the mounting seat 1 and is arranged to be aligned with the hole position on the rotary table, so as to facilitate the centering of the clamp and the rotary table. The second flange 231 is fixed with the mounting seat 1 through a pin shaft, a screw or the like. Preferably, the fastener 4 comprises a screw 41 and a pressing block 42, one end of the tower base 5 is sleeved on the outer shaft 23, the other end is connected with the assembly hole 21 through the screw 41 and presses the pressing block 42, so as to be locked on the outer shaft 23, so that the tower base 5 can be fixed on the outer shaft 23 and rotate synchronously with the outer shaft 23. During installation, the clamp is first fixed on the rotary table through a screw or the like, then the assembly groove 51 of the tower base 5 is inserted along the limiting portion 312, and then the screw 41 passes through the pressing block 42 to be locked with the assembly hole 21, so that the rotary table can drive the mounting seat 1 to rotate, so as to synchronously drive the tower base 5 to rotate.

[0040] The preferred embodiments of the utility model are described above, the protection scope of the utility model is not only limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the utility model belong to the protection scope of the utility model.

Claims

1. A tower base clamp characterized by, Includes mounting base, spindle, and telescopic positioning mechanism. The mounting base is used for fixed connection with the turntable of the five-axis machining center; The telescopic positioning mechanism includes a limiting member, a fixed base, and an elastic member. The fixed base is fixedly connected to the mounting base and has a first positioning surface and a second positioning surface inside. The limiting member is sleeved between the main shaft and the fixed base and has an abutting part and a limiting part. The elastic member is abutting against the limiting member so that the abutting part can switch between abutting against the first positioning surface and abutting against the second positioning surface, thereby causing the limiting member to extend or retract along the fixed base. One end of the spindle is connected to the mounting base, and the other end is provided with an assembly hole. The tower base is configured to be locked to the assembly hole by fasteners after the assembly groove is fitted and limited by the limiting part.

2. The tower base clamp of claim 1, wherein, An inner hole for fitting the main shaft is provided through the center of the limiting member, and the limiting part consists of multiple ribs provided along the side wall of the inner hole.

3. The tower base clamp of claim 2, wherein, The spindle has a boss for fixed connection with the mounting base, and the elastic element is sleeved on the spindle and abuts against the rib and the boss.

4. The tower base clamp of claim 1, wherein, A stepped hole is provided along the center of the fixed base, and the stepped hole extends from the bottom to the top of the fixed base. The first positioning surface and the second positioning surface are formed on different stepped surfaces. By pressing and rotating the limiting member, the abutting part is switched from abutting against the first positioning surface to abutting against the second positioning surface.

5. The tower base clamp of claim 4, wherein, The stepped hole includes a positioning hole and a positioning groove. The first positioning surface is formed in the positioning hole, and the second positioning surface is formed in the positioning groove. The positioning groove is formed by recessing inward along the inner wall of the positioning hole.

6. The tower base clamp of claim 5, wherein, The positioning hole has two opposing straight surfaces, and the positioning groove is configured as a triangle that is recessed inward along the straight surfaces and communicates with the bottom surface of the fixing seat.

7. The tower base clamp of claim 6, wherein, The positioning groove has two slots, which are arranged in a centrally symmetrical manner.

8. The tower base clamp of claim 1, wherein, The bottom of the limiting member extends outward to form the abutting part, which has a square cross-sectional shape and rounded corners at the four corners.

9. The tower base clamp of claim 1, wherein, The spindle includes an inner spindle and an outer spindle. The outer spindle is sleeved outside the inner spindle. One end of the inner spindle is provided with a first flange that is adapted to the mounting base, and the other end is provided with the mounting hole and extends along the outer spindle. The outer spindle has a second flange that is adapted to the fixed base and fixedly connected to the mounting base.

10. The tower base clamp of claim 9, wherein, The fastener includes a screw and a pressure block. One end of the base is fitted onto the outer shaft, and the other end is connected to the mounting hole via the screw and presses against the pressure block to lock it onto the outer shaft.

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