TWI389818B - Pedal method - Google Patents

Description

Foot pedal method

The present invention is particularly directed to a particular technique that removes the disadvantages of metal die casting or plastic injection molded foot pedals.

At present, most of the pedals of bicycles use aluminum as the blank material. Through the die-casting of the mold, a step frame and a shaft tube spanning the step frame are integrally formed, and then a time-consuming and labor-saving cutting is performed throughout the center of the shaft tube. The deep hole in the center, the deep hole provides a mandrel through the pivot, one end of the shaft can be locked to the crank, so that it can provide bicycle pedaling. However, the die casting method has the following disadvantages:

(1) Die-casting alloys are limited; currently there are only six kinds of zinc, tin, lead, copper, magnesium and aluminum.

(2) Expensive equipment: The equipment required for die-casting production, such as die-casting machines, melting furnaces, holding furnaces, and die-casting molds, is quite expensive, and it can only be applied to mass production.

(3) Poor airtightness of the casting: When the molten metal is filled into the die-casting mold at a high speed, turbulent flow occurs, and pores or shrinkage holes are locally formed, which affects the airtightness of the casting, so the shaft tube of the pedal It is easy to enter due to moisture and has a corroded mandrel.

Therefore, some operators have changed the shaft tube and the step frame of the pedal to plastic injection molding, so as to reduce the cost, but the plastic molded foot pedal has poor resistance strength, is easily damaged by impact, and lightly reduces the service life. Heavy weight will be a problem, so the plastic pedal market is not common.

The present inventors have in view of the fact that the current pedals have great problems regardless of the use of metal die-casting or plastic injection molding, and have been carefully tested and researched, and a persevering spirit of invention has finally developed the invention with practical effects. .

The main content of the present invention is to provide a foot pedal manufacturing method, which mainly processes a hollow step frame by cold forming technology, and fixes the tube seat to the step frame by welding so as to have a sufficient contact area to provide a mandrel. The invention is characterized in that the step frame and the socket are manufactured in such a manner that the invention can remove the defects of the metal die-casting or the plastic injection molding pedal, and is more economical to manufacture in a small amount of market demand today. The advantage.

The main content of the invention is to provide a foot pedal manufacturing method, which mainly uses a metal rolled pipe or an aluminum extruded pipe as a blank material, and is cut to form a hollow step frame, and the step frame is processed through a general drilling operation. Bonding holes, and then soldering the tube holders on both sides of the bonding holes to have sufficient contact area to provide a mandrel pivoting therein, thereby manufacturing the step frame and the tube seat, so that the present invention can be removed by metal die casting or The shortcomings of plastic injection molding pedals.

In order to provide a further understanding of the structure, features and other objects of the present invention, the drawings of the preferred embodiments are described in detail below. Referring to Figures 1 to 4, the pedals of the present invention are completed by the following processes:

A. Cutting processing: a long strip of metal substrate is punched out by a punching machine, and the sides of the substrate have jagged claws on both sides, and a coupling hole (11) is arranged in the center, and the two ends of the substrate are respectively The half is flushed with another coupling hole (110);

B. Bending forming: bending the metal substrate to form a hollow step frame (10) closed at both ends, and the two coupling holes (11) (110) are disposed at a relatively opposite concentric position;

C. Welding processing: the step frame (10) is oppositely connected to the outer side of the two coupling holes (11) (110), respectively, a tube seat (12) is concentrically welded;

D. Assembly: a plastic bushing (31) is mounted in each of the inner holes (120) of the two sockets (12), and an outer tube (32) is bridged between the two coupling holes (11) (110). The outer tube (32) is restricted by two bushings (31), and the outer tube (32) and the bushing (31) are centrally provided with a shaft hole (320) (310) and a bushing (31) shaft. The bearing (33) and the leakage preventing washer (34) are arranged in the hole (310), so that the two bearings (33) can provide a mandrel (20) penetrating, and the mandrel (20) can be locked at one end. On the crank, the other end is provided with an externally threaded section (21). In addition, the threaded section (21) provides a nut (35) locking knot, and the bushing (31) at the other end of the mandrel (20) is The cap (36) is closed, and the bushing (31), the outer tube (32), the bearing (33), and the mandrel (20) are fixed together by the locking stress of the nut (35), so that The step frame (10) is capable of freely rotating around the mandrel (20), and provides a bicycle for pedaling.

From the above structural description, the present invention has at least the following advantages:

(1) The material of the present invention can be made of any metal, and the material thereof is not limited.

(2) The cost of the equipment of the invention is much lower than that of the die-casting, so it is used in a small amount of diversified production, and does not require deep hole processing, which is indeed an economic benefit improvement.

(3) Since the invention is formed by cold forming, the airtightness of the finished product is quite excellent, and the corrosion of the mandrel is minimized.

(4) Since the step frame (10) of the present invention is made of metal, its overall structural strength is much better than that of plastic injection molding.

In addition, the foot pedal of the present invention can also be completed as follows: A. Cutting processing: selecting a metal rolled tube or a radially extruded aluminum extruded tube as a blank, and cutting to form a hollow step frame (10) B. Drilling processing: The step frame (10) is machined through the joint hole (11) (110) in the direction of the step frame (10) by a general drilling operation; C. Welding processing: the step frame (10) At the outer side of the bonding hole (11) (110), a tube seat (12) is respectively concentrically welded; D. assembly: a plastic lining is installed in each of the inner holes (120) of the two tube seats (12) The sleeve (31) is bridged between the two coupling holes (11) (110) with an outer tube (32), the two ends of the outer tube (32) are bounded by two bushings (31), and the outer tube (32) a bushing (31) is integrally provided with a shaft hole (320) (310), and a bushing (31) shaft hole (310) is provided with a bearing (33) and a leakage preventing washer (34), so that the two The bearing (33) can provide a mandrel (20) through the pivoting, and the mandrel (20) can be locked to the crank at one end and the externally threaded section (21) at the other end, and the threaded section (21) provides a The nut (35) is locked, and the bushing (31), the outer tube (32), the bearing (33), and the mandrel (20) are combined by the locking stress of the nut (35). Fixed to the pedal housing (10) rotatable about a spindle (20) is freely rotatable, serve pedaling a bicycle traveling purposes.

To sum up, it is a highly invented technical concept, which should meet the requirements of the invention patent application, and apply in accordance with the law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent variations and modifications made by the scope of the present invention should still belong to the present invention. Within the scope of coverage.

(10). . . Step frame

(11) (110). . . Bonding hole

(12). . . Tube holder

(120). . . Bore

(20). . . Mandrel

(twenty one). . . External thread segment

(31). . . bushing

(32). . . Outer tube

(320). . . Shaft hole

(33). . . Bearing

(34). . . Leakproof gasket

(35). . . Nut

(36). . . Cap

First Figure: A schematic exploded view of the structure of the present invention.

Second Figure: A schematic perspective view of the combination of the present invention.

Third Figure: is a schematic plan view of the combination of the present invention.

Figure 4 is a schematic cross-sectional view of the combination of the present invention.

(10). . . Step frame

(11) (110). . . Bonding hole

(12). . . Tube holder

(120). . . Bore

(20). . . Mandrel

(twenty one). . . External thread segment

(31). . . bushing

(32). . . Outer tube

(320). . . Shaft hole

(33). . . Bearing

(34). . . Leakproof gasket

(35). . . Nut

(36). . . Cap

Claims (3)

A foot pedal manufacturing method comprising the following steps: A. cutting processing: selecting a metal rolled tube or a radially extruded aluminum extruded tube as a blank, and cutting to form a hollow step frame; B. drilling Processing: the through hole is formed in the axial direction of the step frame; C. Welding processing: the step frame is respectively welded at a position outside the joint hole, and a tube seat is concentrically welded to provide a sufficient contact area to provide a mandrel pivot In this case, the tread frame can be freely rotated around the mandrel to provide bicycle pedaling. According to the foot pedal manufacturing method described in the first paragraph of the patent application, the D. assembly procedure is performed after the C. welding process. According to the foot pedal manufacturing method described in claim 2, the D. assembly procedure is performed in the inner holes of the two sockets, each of which is provided with a plastic bushing, and an outer tube is bridged between the two coupling holes. The two ends of the outer tube are limited by two bushings, and a shaft hole is arranged in the center of the outer tube and the bushing, and a bearing and a leakage preventing washer are arranged in the shaft hole of the bushing, so that the two bearings can provide a mandrel through Pivoting, and one end of the mandrel can be locked to the crank, and the other end is provided with an externally threaded section, and the threaded section provides a nut lock, and the bushing at the other end of the mandrel is closed by a cap. The bushing, the outer tube, the bearing and the mandrel are fixed together by the locking stress of the nut, so that the step frame can freely rotate around the mandrel.