TWI395688B - Method for manufacturing the wings of a bicycle pedal - Google Patents

Description

Method for manufacturing bicycle pedal wing member

The present invention relates to a method of manufacturing a bicycle pedal wing member, and more particularly to a method of manufacturing a bicycle pedal wing member in an integrally formed manner.

In recent years, bicycles have been widely used by the public. Whether it is commuting in daily life, as a sports fitness tool or for sightseeing and leisure purposes, people often ride bicycles in the city or in the countryside, except for transportation purposes. In addition, bicycles are one of the indispensable items in sports competitions or extreme sports for a long time. Also, due to the increasing popularity of cycling, general users or professionals, even professional players, have increased demands on the driving performance of the bicycle, the convenience of the operation interface, or the comfort during riding. In view of this, related companies have developed many different peripheral components for mountain bikes or road bikes. Among them, in order to provide the user with the pedaling efficiency during riding, a combination of bicycle shoes and pedals is developed. system.

Such a system, as shown in U.S. Patent No. 7,225,703, discloses a bicycle pedal and crank device that primarily includes a clipless bicycle pedal and a crank arm assembly having a fixed axle and a wing member And a main body and a spring, the wing member, the main body and the spring are sleeved on the fixed shaft. Wherein, the wing member and the spring are disposed in the body; and the spring is disposed in the wing member, and one end of the fixed shaft is provided with a sleeve, and the sleeve is fixed to one end of the fixed shaft through a bolt . And the other end of the fixed shaft is connected by a screw ring The crank arm assembly is combined, and a bearing is disposed in the screw ring. For the bicycle pedal disclosed in this case, the user can snap a cleat at the bottom of his bicycle shoe into the wing member (or the body). When riding, the splint will be tightly coupled with the wing member, and is not easily detached from the wing member. When the user wants to take off, the clip is only required to be at a specific angle with respect to the wing member to be released. In this way, since the bicycle shoe will be in a stable state with the bicycle pedal, the user's pedaling force can be transmitted to the crank more efficiently, and the stability at the time of pedaling can also be provided.

In the manufacture of the wing member (or the body) as disclosed in the above, there is a method as shown in U.S. Patent No. 6,851,189, which relates to a method of manufacturing a bicycle-free clip-on pedal which is formed by stamping a metal sheet. a flat inner wing and an outer wing member, each of the members includes a pair of annular portions each having a mandrel hole, and further, the two ends of the member are respectively formed with a joint and a groove, the joint and the concave The grooves have shapes complementary to each other, respectively. Next, the member is bent into a rectangular structure, and a plurality of bends are formed in the member. Finally, the joint of the member and the groove are welded to form a joint, and the joint is combined with the groove, wherein the welding can be performed by a brazing or welding process.

In the above conventional manufacturing method, since the wing member must be formed by a welding process, the strength of the joint interface will be much smaller than the body strength of the wing member, and if the parameters of the welding process are improperly controlled, There are unintended defects in the joint interface. Therefore, when the user continues to apply force to the wing member by stepping on for a long time; or when the force is excessively applied due to improper operation, the welding interface is easily caused by stress concentration. Destruction occurred. Especially for applications requiring high-speed riding such as races or sports, such a structurally unstable pedal system may affect the safety of the user when riding. In addition, since such a manufacturing method is difficult to grasp the structural uniformity of the soldering interface between the joint and the groove, it is possible to lower the yield of the product, and relatively increase the manufacturing cost.

SUMMARY OF THE INVENTION A primary object of the present invention is to solve the problem of the structural strength of a wing member being weak due to the use of a welding process among the conventional methods of manufacturing a bicycle pedal member.

In order to achieve the above object, the present invention provides a method for manufacturing a bicycle pedal wing member, comprising the steps of: stamping a sheet to form a preform, the preform comprising an opening and a body surrounding the opening, the body having a preset The processing surface has a pressure-receiving area adjacent to the opening, wherein the body includes a first enlarged portion, a second enlarged portion, and two coupled to the first enlarged portion and the second enlarged portion, respectively a curved portion on the two sides; and applying an impact force to the pressed portion to fold the first enlarged portion, the second enlarged portion and the curved portion, and the first enlarged portion and the second enlarged portion are The machined faces are opposite each other, and the machined faces of the arcuate portions form two curved surfaces opposite each other.

According to an embodiment of the method for manufacturing a wing member of a bicycle pedal according to the present invention, the preform is positioned between an upper die and a lower die before the impact force is applied, and the upper die and the lower die are sandwiched Holding an edge portion of the body, and when applying the impact force, the upper mold system leaves the edge The edge portion allows the first enlarged portion, the second enlarged portion, and the curved portion to be folded between the upper mold and the lower mold.

It can be seen from the above that the manufacturing method of the bicycle pedal wing member of the present invention achieves the advantageous effects compared with the prior art: First, the present invention utilizes an integrally formed manner to manufacture the wing member, and there will be no joint interface after forming. Existence, therefore, will make the strength of the wing member obtain a significant improvement, so that the user has higher safety when riding, and will extend the service life of the wing member; Second, because the present invention is machined The method replaces the conventional welding process, wherein the former is directly formed after being subjected to force deformation, and the latter is required to be joined by the occurrence of a chemical reaction, so that the present invention can greatly shorten the manufacturing time of the wing member and improve Productivity.

The detailed description and technical content of the method for manufacturing the wing member of the bicycle pedal of the present invention will now be described as follows:

Please refer to FIG. 1-1 to FIG. 1-5, which are schematic diagrams showing the steps of a method for manufacturing a wing member of a bicycle pedal according to an embodiment of the present invention. First, a plate 10 is obtained, and the plate 10 can be a stainless steel plate. A cold rolled steel sheet, a hot rolled steel sheet or a titanium alloy sheet, wherein the titanium alloy sheet material may be a titanium alloy containing a metal element such as aluminum or vanadium. The sheet 10 is stamped to obtain a preform 20 from the sheet 10. As shown in FIG. 1-2, the preform 20 includes an opening 21 and a body 22 surrounding the opening 21. The body 22 is preset with a processing surface 221, and a pressing area 222 is preset on the processing surface 221. In this In the embodiment, the pressure receiving region 222 is located at a region of the processing surface 221 adjacent to the opening 21, and the pressure receiving region 222 is adjacent to the opening 21.

Continuing to refer to FIG. 1-2, the body 22 includes a first enlarged portion 23, a second enlarged portion 24 and two curved portions 25 and 26, and the curved portions 25 and 26 are respectively coupled to the first enlarged portion. The two sides of the second enlarged portion 24, wherein the two ends of the curved portion 25 are respectively connected to one side of the first enlarged portion 23 and the second enlarged portion 24; and the curved portion 26 The two ends are connected to the other side of the first enlarged portion 23 and the second enlarged portion 24, respectively. Next, an impact force is applied to the pressed region 222, thereby folding the first enlarged portion 23, the second enlarged portion 24 and the curved portions 25, 26, so that the preform 20 forms a formed body 30. As shown in FIG. 1-3, the processed surface 221 of the first enlarged portion 23 and the second enlarged portion 24 will face each other, and the processed surface 221 of the curved portions 25, 26 will be folded. Two curved surfaces 251, 261 opposite each other are formed.

Next, a bending step is performed, which is referred to as "FIGS. 1-4", and the curved portions 25, 26 are bent such that the curved portions 25, 26 respectively form an arch portion 27, 28, which The arch portion 27 includes a first inclined portion 271, a second inclined portion 272, and a straight portion 273. The arch portion 28 also includes a first inclined portion 281, a second inclined portion 282, and a flat portion. Straight paragraph 283. The first inclined portion 271, 281 is in contact with the first enlarged portion 23 and inclined at an angle with respect to the first enlarged portion 23; the second inclined portion 272, 282 is in contact with the second enlarged portion 24, and An angle is inclined with respect to the second enlarged portion 24, and the straight segments 273, 283 are respectively coupled between the first inclined segments 271, 281 and the second inclined segments 272, 282, wherein the angle is according to the angle The desired shape of the wing members is adjusted. In addition, in this issue In the Ming Dynasty, the bending step can be achieved by stamping or other equivalent machining methods.

Referring to FIG. 1-5 again, after the bending step is completed, a perforating step is performed to obtain the finished product of the wing member. The punching step presses the central portion and the outer edge portion of the first enlarged portion 23 and the second enlarged portion 24 simultaneously by pressing, so that the first enlarged portion 23 and the central portion of the second enlarged portion 24 are punched. Forming a first shaft hole 231 and a second shaft hole 241 respectively; and the outer edge portion of the first enlarged portion 23 and the second enlarged portion 24 respectively form a first gap 232 and a second gap 242, wherein the first shaft hole 231 and the second shaft hole 241 are coaxially disposed. According to the actual manufacturing requirements, the first shaft hole 231, the second shaft hole 241, and the first notch 232 and the second notch 242 may be formed at the same time as the stamping device in the embodiment. The first hole 231 and the second hole 242 are formed by the first hole 231 and the second hole 241. In addition, in addition to the sequence of steps in the embodiment, the punching step may be performed first, and then the bending step is performed.

In the present embodiment, the impact force is applied to the pressed region 222 by using a punching device. Please refer to FIG. 2-1 to FIG. 2-4, which is a manufacturing method of the wing member of the bicycle pedal according to the present invention. In the embodiment, a schematic flow chart of the step of forming the preform into a shaped body using a stamping apparatus is shown. The stamping apparatus includes an upper mold 40 and a lower mold 50. The upper mold 40 and the lower mold 50 each include an upper mold 41, a lower mold 51, and two through holes 42 respectively penetrating the upper mold 41 and the lower mold 51. The upper mold 41 further includes a punch 43 disposed in the through hole 42 and vertically displaceable relative to the upper mold 41. In addition, the opposite sidewalls of the lower mold 51 are respectively provided with two grooves 511, the position of the groove 511 is corresponding to the first enlarged portion 23 of the body 22 and the second enlarged portion 24; and the opposite sidewalls of the upper mold 41 are respectively provided with two grooves 411, the groove 411 The position also corresponds to the first enlarged portion 23 of the body 22 and the second enlarged portion 24.

Please continue to refer to FIG. 2-1, since the preform 20 is obtained by stamping the plate 10, and when the opening 21 is formed, the pressing pressure will cause the body 22 to form a concave shape, that is, the body 22 There will be a height difference between the outer edge and the inner edge such that the machined surface 221 of the body 22 has a curved surface. Before applying the impact force, the preform 20 is placed in the lower mold 50 in advance as shown in FIG. 2-1, and the preform 20 is positioned between the upper mold 41 and the lower mold 51. , the upper mold 41 is closed downward to the lower mold 50, so that the upper mold 41 is in a positioning position as shown in FIG. 2-2, and the upper mold 41 will be adjacent to one edge of the body 21. The portion 223 forms a contact such that the upper mold 41 and the lower mold 51 can grip the edge portion 223.

After the preform 20 is positioned between the upper mold 41 and the lower mold 51, the pressure receiving region 222 is punched by the punch 43 to apply the impact force, and the impact is received in the pressure receiving region 222. At the same time, the upper mold 41 will move upward to leave the edge portion 223, so that the upper mold 41 is in a stamping position as shown in FIG. 2-3, and the upper mold 41 will not be associated with the body 21 at this time. The edge portion 223 forms a contact. Thereby, the first enlarged portion 23, the second enlarged portion 24 and the curved portions 25, 26 will be in the upper mold 41 and the lower mold 51 because the pressed portion 222 is subjected to impact from the impact force. Folding between the two, and the gap formed between the upper mold 41 and the lower mold 51 is deformed, so that the first enlarged portion 23 and the second enlarged portion 24 are produced. The 90° inversion is produced, and the curved portions 25, 26 also produce a 90° inversion so that the preform 20 forms the shaped body 30. Finally, the formed body 30 is taken out from the upper mold 40 and the lower mold 50 to obtain the formed body 30 as shown in Figs. 1-3. In addition, in the embodiment, the shapes of the grooves 411 and 511 are preset to be complementary to the first enlarged portion 23 and the second enlarged portion 24 of the formed body 30.

In summary, the manufacturing method of the wing member of the bicycle pedal of the present invention mainly utilizes a machining process to manufacture the wing member in an integrally formed manner, which is obtained by the present invention compared to the conventional manufacturing method. After the wing member, the joint interface will not be formed. As a result, the structural strength of the wing member can be greatly improved, and the service life of the wing member will be prolonged, which will have higher safety in practical use. On the other hand, in terms of manufacturing, since the steps of the present invention can be achieved by using a stamping process, it is more simplified than the conventional manufacturing method. Therefore, the present invention has the advantages of rapid manufacturing and low cost.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

10‧‧‧ plates

20‧‧‧Preforms

21‧‧‧ openings

22‧‧‧Ontology

221‧‧‧Processing surface

222‧‧‧Compressed area

223‧‧‧Edge section

23‧‧‧First Expansion

231‧‧‧First shaft hole

232‧‧‧ first gap

24‧‧‧ Second Expansion

241‧‧‧Second shaft hole

242‧‧‧ second gap

25‧‧‧Arc Department

251‧‧‧ Surface

26‧‧‧Arc Department

261‧‧‧ Surface

27‧‧‧Arch

271‧‧‧First inclined section

272‧‧‧Second inclined section

273‧‧‧ Straight section

28‧‧‧Arch

281‧‧‧First inclined section

282‧‧‧Second inclined section

283‧‧‧ Straight section

30‧‧‧Formed body

40‧‧‧Upper mold

41‧‧‧上模

411‧‧‧ Groove

42‧‧‧through hole

43‧‧‧ Punch

50‧‧‧ Lower mold

51‧‧‧下模

511‧‧‧ Groove

52‧‧‧through hole

1-1 to 1-5 are schematic flow charts showing steps in an embodiment of a method for manufacturing a wing member of a bicycle pedal according to the present invention.

2-1 to 2-4 are schematic flow charts showing the steps of forming the preform into a shaped body using a stamping apparatus according to an embodiment of the method for manufacturing a bicycle pedal wing member of the present invention.

20‧‧‧Preforms

21‧‧‧ openings

22‧‧‧Ontology

221‧‧‧Processing surface

222‧‧‧Compressed area

23‧‧‧First Expansion

24‧‧‧ Second Expansion

25‧‧‧Arc Department

26‧‧‧Arc Department

Claims (5)

A method for manufacturing a bicycle pedal wing member, comprising the steps of: stamping a sheet to form a preform, the preform comprising an opening and a body surrounding the opening, the body prescribing a processing surface, and the processing surface is pre-predetermined a pressing portion adjacent to the opening, wherein the body includes a first enlarged portion, a second enlarged portion, and two curved portions respectively connecting the two sides of the first enlarged portion and the second enlarged portion; The preform is positioned between an upper die and a lower die, and sandwiches an edge portion of the body with the upper die and the lower die; and applies an impact force to the pressed region, and the upper die leaves the edge a portion of the first enlarged portion, the second enlarged portion, and the curved portion being folded over a gap formed between the upper mold and the lower mold, wherein the first enlarged portion and the second enlarged portion are folded The machined faces are opposed to each other, and the machined faces of the curved portions form two curved surfaces opposite to each other. The method for manufacturing a bicycle pedal wing member according to claim 1, wherein after the impact force is applied, the curved portion is bent to form an arch portion, each of the arch portions including the first portion a first inclined section that meets the enlarged portion, a second inclined section that is in contact with the second enlarged portion, and a straight section that is coupled between the first inclined section and the second inclined section. The method for manufacturing a bicycle pedal wing member according to claim 1, wherein the first enlarged portion and the second enlarged portion are stamped after the impact force is applied, and the first enlarged portion and the first enlarged portion are The second enlarged portion respectively forms a first shaft hole and a second shaft hole which are coaxially disposed. The method for manufacturing a bicycle pedal wing member according to claim 1, wherein the first enlarged portion and the first portion are applied after the impact force is applied The outer edge of the second enlarged portion is stamped, and the first enlarged portion and the second enlarged portion are respectively formed with a first notch and a second notch. The method for manufacturing a bicycle pedal wing member according to claim 1, wherein the sheet material is a group consisting of a stainless steel sheet, a hot and cold rolled steel sheet, a hot rolled steel sheet and a titanium alloy sheet.