CN215553898U - Plastic crank with metal framework - Google Patents
Plastic crank with metal framework Download PDFInfo
- Publication number
- CN215553898U CN215553898U CN202121582751.0U CN202121582751U CN215553898U CN 215553898 U CN215553898 U CN 215553898U CN 202121582751 U CN202121582751 U CN 202121582751U CN 215553898 U CN215553898 U CN 215553898U
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- China
- Prior art keywords
- metal piece
- end metal
- middle shaft
- shaft end
- pedal
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Abstract
The utility model discloses a plastic crank with a metal framework, which comprises a middle shaft end metal piece (1) and a pedal end metal piece (2), wherein a flat plate-shaped metal framework (3) is connected between the middle shaft end metal piece (1) and the pedal end metal piece (2); the metal framework (3) is coated with a plastic part (4), and the plastic part (4) coats the outer sides of the middle shaft end metal piece (1) and the pedal end metal piece (2). The utility model not only can reduce the cost of raw materials, but also has the advantage of high strength.
Description
Technical Field
The utility model relates to the field of accessories for bicycles, in particular to a plastic crank with a metal framework.
Background
At present, cranks for bicycles, which are common in the market, are all in a 7 shape, and are made of metal; when the crank is machined, the metal is machined into a cylindrical metal section, and then the metal section is forged and machined to form the 7-shaped crank; and in order to prevent the metal crank from rusting, the plastic coating operation is required to be carried out outside the metal in the later period. Such cranks have the problem of high raw material costs.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a plastic crank with a metal framework. The utility model has the advantage of low cost of raw materials.
The technical scheme of the utility model is as follows: a plastic crank with a metal framework comprises a middle shaft end metal piece and a pedal end metal piece, wherein a tapered square hole is formed in the middle shaft end metal piece, and a threaded hole is formed in the pedal end metal piece; a flat-plate-shaped metal framework is connected between the middle shaft end metal piece and the pedal end metal piece, a plastic part is coated outside the metal framework, and the plastic part coats the outer sides of the middle shaft end metal piece and the pedal end metal piece.
In the plastic crank with the metal framework, the middle shaft end metal piece, the pedal end metal piece and the metal framework are of an integrally formed structure.
Compared with the prior art, the metal framework is connected between the middle shaft end metal piece and the pedal end metal piece, is in a flat plate shape, and saves a large amount of raw material cost under the condition of a crank with the same specification; the plastic parts are coated outside the metal framework, the middle shaft end metal piece and the pedal end metal piece, so that the appearance of the whole crank is the same as that of the conventional all-metal crank while plastic-coated antirust operation is carried out, and the plastic parts for plastic coating also have certain strength, so that the strength between the middle shaft end metal piece and the pedal end metal piece can be better enhanced; because the pedal end metal piece rotates around the middle shaft end metal piece in the using process of the bicycle, the position between the pedal end metal piece and the middle shaft end metal piece is most easily stressed, and the stress direction is along the width direction of the flat plate-shaped metal framework, so that the metal framework is in a flat plate shape, but can bear larger force; meanwhile, the plastic part coats the metal framework from all directions, and particularly the metal framework is prevented from deforming in the vertical direction; the part saves the cost of raw materials and keeps the strength as much as possible. In addition, the middle shaft end metal piece, the pedal end metal piece and the metal framework are of an integrally formed structure, and the connecting position between the middle shaft end metal piece and the pedal end metal piece relative to the metal framework is not easy to damage, so that the processing is convenient and the overall strength is ensured. Therefore, the utility model not only can reduce the cost of raw materials, but also has the advantage of high strength.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a top view of the present invention.
The labels in the figures are: 1-middle shaft end metal piece, 2-pedal end metal piece, 3-metal framework, 4-plastic part, 5-conical square hole and 6-threaded hole.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not to be construed as limiting the utility model.
Examples are given. A plastic crank with a metal framework is shown in figures 1 and 2 and comprises a middle shaft end metal part 1 and a pedal end metal part 2, wherein the middle shaft end metal part 1 is provided with a tapered square hole 5, and the pedal end metal part 2 is provided with a threaded hole 6; a flat-plate-shaped metal framework 3 is connected between the middle shaft end metal piece 1 and the pedal end metal piece 2, a plastic part 4 is coated outside the metal framework 3, and the plastic part 4 coats the middle shaft end metal piece 1 and the pedal end metal piece 2.
The middle shaft end metal piece 1, the pedal end metal piece 2 and the metal framework 3 are of an integrally formed structure.
The working principle is as follows: the middle shaft end metal part 1, the pedal end metal part 2 and the metal framework 3 are integrally formed and processed, a tapered square hole 4 for connecting a middle shaft is formed in the middle shaft end metal part 1, and a threaded hole for connecting a pedal is formed in the pedal end metal part 3; and finally, the middle shaft end metal piece 1, the pedal end metal piece 2 and the metal framework 3 are coated with the plastic part 4, so that the finished crank is in the shape of a common crank.
The metal framework 3 bears the stress of the crank in the wide width direction of the metal framework 3 when in use, and the metal framework 3 is coated with a thick plastic part in the vertical direction, so that the metal framework 3 is not easy to deform in the vertical direction, and the strength of the whole part is high.
Claims (2)
1. The utility model provides a take metal framework's plastics crank which characterized in that: the bicycle pedal comprises a middle shaft end metal piece (1) and a pedal end metal piece (2), wherein a conical square hole (5) is formed in the middle shaft end metal piece (1), and a threaded hole (6) is formed in the pedal end metal piece (2); a flat plate-shaped metal framework (3) is connected between the middle shaft end metal piece (1) and the pedal end metal piece (2), a plastic part (4) is coated outside the metal framework (3), and the plastic part (4) coats the outer sides of the middle shaft end metal piece (1) and the pedal end metal piece (2).
2. The plastic crank with metal framework of claim 1, wherein: the middle shaft end metal piece (1), the pedal end metal piece (2) and the metal framework (3) are of an integrally formed structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121582751.0U CN215553898U (en) | 2021-07-13 | 2021-07-13 | Plastic crank with metal framework |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121582751.0U CN215553898U (en) | 2021-07-13 | 2021-07-13 | Plastic crank with metal framework |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215553898U true CN215553898U (en) | 2022-01-18 |
Family
ID=79825249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121582751.0U Active CN215553898U (en) | 2021-07-13 | 2021-07-13 | Plastic crank with metal framework |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215553898U (en) |
-
2021
- 2021-07-13 CN CN202121582751.0U patent/CN215553898U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |