JP3010709U - Structure of connecting fixed rod of aluminum alloy wheel rim for bicycle - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a structure of a connecting and fixing rod for an aluminum alloy wheel rim for a bicycle, in which the wheel rim after being joined is completely fixed, does not easily loosen, and has the effect of a tight joint. To do. [Structure] A pin 3 having a forward tap screw is placed across opposite elliptical holes 431 and 441 formed in advance at a joint portion of a molded wheel rim, and the joint portion is further advanced from both ends toward the center. A structure of a connecting and fixing rod of an aluminum alloy wheel rim for automobiles for compressing and joining, wherein a center of the pin 3 is a partition 31.
Both left and right stages are provided with a coaxial tap and a forward tap with a reverse tap, and the tip of each is a tapered constant end 3
4, 35, and the opposite elliptical holes 431, 44
The pin 3 is placed so as to straddle No. 1 and the taps on both left and right stages are smoothly performed toward the elliptical holes 431 and 441.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a connecting and fixing rod of an aluminum alloy wheel rim for a bicycle.

[0002]

[Prior art]

 In the conventional manufacturing process of bicycle wheel rims, a hydraulic machine is used to perform extraction molding, and then a bending process is performed to form the appearance of the wheel rim.However, the extraction-molded wheel rims have cut edges that must be joined. So far, welding has been the only method of processing this cut.

[0003]

[Problems to be solved by the device]

 After the welding, due to poor processing during the treatment process or construction process before welding, the wheel rim may easily crack after welding, or the roundness may be affected, making it impossible to attach the tire. There is a problem that it directly affects the quality of the plants and cannot maintain the same level. In addition, the issue of whether the welded surface is perfect directly affects the quality, and it is not possible to predict whether the welded surfaces of the wheel rims match each other, which is a major problem during quality inspection. Furthermore, if the wheel rims are joined by a welding method, the cost is considerably high, and the competitiveness in the market is relatively weak, and it is not widely accepted in the industry.

Therefore, in a conventional bicycle wheel rim, as shown in FIG. 1, a prefabricated insert pin (fixing pin) 2 is formed in the wheel rim, and holes 111 and 121 having a triangular cross section are formed. And place it in the holes 111, 121 of both mating surfaces 11, 12 and fix the hydraulic press on both sides of the mating surfaces and press it towards the center. At this time, since the mesh-shaped non-slip line 21 is pressed on the fixing pin 2, when the line is pressed and inserted, the action of the non-slip line 21 on the surface prevents the detachment after joining. The purpose of is achieved.

However, the ridge line 21 is an entire ridge line and has no directivity, and uneven insertion on both joint surfaces is likely to occur. Moreover, the line 21 on the pin 2 inserted into only one side of the wheel rim 1 easily forms a lateral groove in the longitudinal direction in the pipe. For this reason, the wheel rim cannot be sufficiently joined because it is likely to fall off toward both sides of the joining surface due to the tension. According to the data of the tensile test, the fixed pin can be pulled out with the tensile strength of about 270 kg, so that only the molding time is saved at the time of manufacturing and the better bonding effect is not obtained.

In view of the above problems, the present invention provides a bicycle aluminum alloy wheel rim connecting and fixing rod for a bicycle, which has a completely fixed wheel rim and does not easily loosen and has an effect of tight bonding. It is intended to provide a structure.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the structure of the connecting and fixing rod of the aluminum alloy wheel rim for a bicycle according to the present invention is such that the advance tap screw is formed in the corresponding elliptical hole formed in advance at the joint of the molded wheel rim. It is a structure of a connecting and fixing rod of an aluminum alloy wheel rim for automobiles, which is placed so as to straddle a pin having a joint and further presses the joint from both ends toward the center, and the center of the pin is separated. The left and right stages are provided with coaxial taps and forward taps with reverse taps, and the tip ends of the taps are taper-shaped constant ends, and the pins are placed so as to straddle the opposite elliptical holes. It is characterized in that the advance taps on both the left and right stages are smoothly operated toward the elliptical hole.

[0008]

[Effect of action and device]

 According to the structure of the aluminum alloy wheel rim connecting and fixing rod for bicycles of the present invention, the tap pin does not detach from the elliptical hole and has a tensile strength of approx. It reaches 470 to 500 kg and can be quickly joined, and there is no gap on the joining surface of the wheel rim after joining, so that tight joining is possible and the product can maintain a constant level.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows the structure of the connecting and fixing rod of the aluminum alloy wheel rim for a bicycle according to this embodiment. This structure is mainly composed of a pin 3 having a lead tap screw made of steel as shown in FIG. 3, the middle part of the pin 3 is a dividing section 31, and the side edges of the dividing section 31 respectively have leading tap screws 32 and 33. Are provided, and the tip ends thereof are tapered constant ends 34 and 35, respectively. When the fixed ends 34 and 35 are placed so as to straddle the opposite elliptical holes 431 and 441, the advance tap screws 32 and 33 at the left and right ends are smoothly tapped toward the elliptical holes 431 and 441. In addition, the tap screw cuts with the blade portions 321 and 331 of the tap, and the generated chips are embedded in the gaps 432 and 442 of the screw, so that the action of joining and fixing is achieved.

Referring to FIG. 3 to FIG. 8, elliptical holes 431 and 441 penetrating all the wheel rims are provided in the reinforcing sections 43 and 44 at both curved portions of the bicycle aluminum alloy wheel rim 4, and thereafter, Place the wheel rim 4 to be joined on the hydraulic press, and further place the pins 3 of the two lead tap screws with lead tap screws over the respective elliptical holes 431, 441 to be joined. At this time, the hydraulic press is operated to join both joining surfaces 41, 42 of the wheel rim 4 inwardly, but the pin 3 of the advance tap screw is pressed and the lead tap screws 32, 33 are provided on its own. The purpose of securely tapping into the elliptical holes 431 and 441 at both ends with the separating section 31 as the middle point and fixing after tapping cannot be achieved easily because it cannot be easily pulled out by external force, and the effect of tight bonding And has multiple functions such as increasing the strength of the joint.

Referring now to FIGS. 7 and 8, when squeezed, there are advance tap screws 32, 33 at both ends of the pin of the advance tap screw, and when squeezed, a coaxial rotating reverse tap. Since the pin 3 of the tap screw is threaded in accordance with the method, the taps are evenly tapped into the elliptical holes 431 and 441 at the left and right ends of the joining surfaces 41 and 42, and the joining purpose is achieved without loosening easily .

[Brief description of drawings]

FIG. 1 is an assembly view showing a structure of a conventional aluminum alloy wheel rim connecting and fixing rod for a bicycle.

FIG. 2 is a perspective view showing an aluminum alloy wheel rim connection fixing rod for a bicycle according to the present invention.

FIG. 3 is an assembly view of an aluminum alloy wheel rim connecting and fixing rod for a bicycle according to the present invention.

FIG. 4 is a cross-sectional view showing a process of joining an aluminum alloy wheel rim connection fixing rod for a bicycle according to the present invention.

FIG. 5 is a cross-sectional view showing a process of joining the aluminum alloy wheel rim connection fixing rod for a bicycle according to the present invention.

FIG. 6 is a cross-sectional view showing a process of joining the aluminum alloy wheel rim connecting and fixing rod for a bicycle according to the present invention.

7 is a partially enlarged sectional view of FIG.

8 is an enlarged view of the circle shown in FIG. 7. FIG.

[Explanation of symbols]

 3 pin 4 Wheel rim 31 Separation section 32, 33 Lead tap screw 431, 441 Elliptical hole

Claims (1)

[Scope of utility model registration request] 1. A pin having a lead tap screw is placed across opposite elliptical holes formed in advance at a joint portion of a molded wheel rim, and the joint portion is pressed from both ends toward the center. , A structure of a connecting and fixing rod of an aluminum alloy wheel rim for automobiles for joining, wherein the center of the pin is a division section, and both left and right stages are provided with a coaxial tap and a forward tap with a backward tap. , The tip of each of them is a tapered constant end, and the pin is placed so as to straddle the opposite elliptical holes, and the advance taps on both left and right stages are smoothly tapped toward the elliptical holes. The structure of the connecting and fixing rod of the aluminum alloy wheel rim for automobiles, which is characterized by being performed.