JPH0241478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing handlebars on bicycles, motorcycles, etc.

Generally, handlebars of bicycles, motorcycles, etc. are connected to a handlebar post via a handle lug, and conventionally, the handlebar is fixed to the handle lug by welding or by tightening bolts and nuts. However, welding is relatively troublesome, the quality varies widely, and there are problems with strength, such as cracking caused by long-term use. Additionally, in recent years, consideration has been given to using clad pipes in which the outer circumferential surface of an iron pipe is coated with stainless steel for handlebars, but in such clad pipes, the thin stainless steel layer tends to break due to the heat during welding. , there is a problem that welding work is difficult. Furthermore, the connection strength cannot be said to be sufficient when tightening bolts and nuts.

The present invention solves these conventional problems.The handlebar can be firmly fixed to the handle lug without loosening, and the workability is good.Moreover, even in the case of a clad pipe, the stainless steel layer can be fixed. The purpose of the present invention is to provide a method for fixing a handlebar without tearing the handlebar.

Therefore, the present invention is characterized in that a polygonal hole is provided through the handle lug fixed to the upper end of the handle post, a tubular handlebar is inserted into the hole, and the handlebar lug is fixed to the upper end of the handlebar post. A rod-shaped core metal is press-fitted from both left and right sides into an inner ring of a predetermined length inserted into a position corresponding to the hole, and the inner ring and the handlebar are bulged out by the core metal, or the inner ring and the handlebar are expanded by applying hydraulic pressure. The handlebar is bulged out, and the handlebar is pressed into the hole of the handle lug.

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

1 to 4, 1 is a handle post, 2 is a circular handle bar, and 3 is a brake lever. The handle bar 2 is attached to the handle post 1 via a handle lug 4. The handle lug 4 is formed of a plate material into a substantially U-shape, and is fixed to the post 1 by welding with its curved portion circumscribing approximately half of the outer circumference of the upper end of the handle post 1. A hole 6 through which the handlebar 2 is attached is provided approximately at the center of both the left and right pieces 5, 5 of the handle lug 4, and a small diameter circular hole 7 is provided at the tip. The handlebar 2 is inserted through and secured to the handlebar 6, and the brake levers 3 are inserted through the circular holes 7, 7 to serve as inner lever receiving pieces. Reference numerals 8 and 8 are outer lever receivers attached to the handlebar 2, 9 and 9 are dovetail pieces, and 10 is a cap made of plate material that covers the upper edges of the handle post 1 and the handle lug 4.

Therefore, the hole 6 for attaching the handlebar 2
has a hexagonal shape, and is bent inward by pressing to form a short cylindrical shape. Reference numeral 11 denotes a cylindrical inner ring for fixing the handlebar 2 to the handle lug 4, which is inserted into the tube 12 of the handlebar 2, and both left and right ends corresponding to the holes 6, 6 are formed by rod-shaped core metals to be described later. The handlebar 2 is bulged out and the bar 2 is pressed against the inner peripheral surfaces of the holes 6, 6. In addition, handle post 1 and handle bar 2
As shown in FIG. 3, there is a clad pipe 1 formed by applying a stainless steel coating layer 14 to the outer peripheral surface of an iron pipe 13.
5 is preferable because the handle can be manufactured at a lower cost than a pipe made entirely of stainless steel. In addition to this, it goes without saying that a plated iron pipe may also be used.

Next, a method for fixing the handle bar 2 to the handle lug 4 will be explained in order of steps with reference to FIGS. 5 to 9. First, as shown in FIG. 5, hexagonal holes 6, 6 are formed through the handle lug 4 as described above. This hole 6 is preferably large enough to allow the annular handlebar 2 to be inserted therethrough without rattling. Next, the handlebar 2 is inserted into the holes 6, 6 as shown in FIG. Next, as shown in FIG.
A cylindrical metal inner ring 11 with a length L larger than
Insert. The inner ring 11 has chamfered outer corners 16 at both ends, and has an outer diameter equal to the inner diameter 1 of the handlebar 2.
It is preferable that the size is such that it can be inserted into 2 without rattling. Note that the inner ring 11 may be inserted into the tube 12 of the bar 2 in advance before the handle bar 2 is inserted into the holes 6, 6. Thereafter, as shown in FIG. 8, rod-shaped core metals 17, 17 are inserted into the tube 12 of the handlebar 2 from both the left and right sides, and the tips 18, 18 of the core metals 17, 17 are simultaneously inserted into both the left and right ends of the inner ring 11. Press fit. By press-fitting this core metal 17, the inner ring 11
Then, the handlebar 2 bulges out as shown in FIG. 9, and the outer peripheral surface of the bulged portion of the handlebar 2 is pressed against the inner peripheral surface of the hexagonal holes 6, 6 of the handle lug 4. Note that the core metal 17 is made of a round bar material, and its tip 18
has a hexagonal shape corresponding to the shape of the hole 6, and the outer peripheral corner is chamfered at a predetermined angle to guide press-fitting into the inner ring 11. In addition, core metal 17
The diameter of the inner ring 11 is set to be slightly smaller than the outer diameter of the inner ring 11. Finally, as shown in the arrow in Fig. 9, the core metals 17, 17
, and fixing of the handle bar 2 to the handle lug 4 is completed.

The handlebar 2 fixed in this manner bulges together with the inner ring 11, and the outer circumferential surface of the bulged portion presses against the inner circumferential surface of the hexagonal hole 6 over the entire circumference. As shown in the figure, the handlebar 2 has a raised shape on both sides of the hole 6, and the hexagonal pressure bonding with the raised parts 20 reliably prevents displacement in the axial direction and rotational direction. Note that the shapes of the hole 6 and the tip end 18 of the core bar 17 are not limited to hexagonal shapes, but may be other polygonal shapes.

Although not shown, after FIG. 7, the inner ring 1
1, a hydraulic or water pressure reduction is applied in the outer radial direction to bulge the inner ring 11 and the handlebar 2 and bring them into pressure contact with the inner circumferential surface of the polygonal hole 6.
preferable. It is also possible to create a similar bulge using an instantaneous explosive molding method using electrical discharge in a liquid.

10 and 11 show the outer lever receiver 8 which is attached to the handlebar 2, and the lever receiver 8 has a hole 2 for receiving the brake lever 3.
1 and the nut member 22
A spacer 23 is interposed between the handlebar 2 and the handlebar 2 , and has one side formed in an arcuate surface 23 a so as to follow the outer peripheral surface of the handlebar 2 . It consists of a hexagonal bolt 26 that is inserted through a through hole 24 and screwed into a threaded hole 25 of a nut member 22, and a contact portion 27 of the head 26a of the hexagonal bolt 26 with the circumferential surface of the inner pipe 12 has a Corresponding to the radius, a circular arc portion is formed by press molding or chamfering is performed.

In this way, if the lever receiving part side is a nut type, processing is easier compared to the conventional case where the lever receiving part side is a bolt type.
A commercially available product can be used, and costs can be reduced. Of course, when the handlebar 2 is a clad pipe, this mounting method does not use welding, so there is no adverse effect on the stainless steel coating layer, and there is an advantage that the lever receiver 8 can be mounted beautifully.

The present invention has effectively achieved its intended purpose with the configuration detailed above. That is, a polygonal hole 6 is provided in the handle lug 4 fixed to the upper end of the handle post 1, the tubular handlebar 2 is inserted into the hole 6, and the hole in the tube 12 of the handlebar 2 is inserted. 6. Press-fit rod-shaped core metals 17, 17 from both left and right sides into the inner ring 11 of a predetermined length inserted into the corresponding position.
7 and 17 connect the inner ring 11 and the handlebar 2.
The inner ring 11 and the handlebar 2 are bulged out by applying hydraulic pressure or water pressure, and then the handlebar 2 is pressed into the hole 6 of the handle lug 4, so that the handlebar 2 is firmly fixed. It has great strength in both the rotational and axial directions and will not cause misalignment in both directions. In addition, there is no need for finishing processing after welding as in the case of welding, and the variation in quality is small and workability is good. Furthermore, even in the case of the clad pipe 15, which is difficult to weld, the stainless steel coating layer 14 will not melt and tear due to welding heat, and can be securely fixed. Therefore, by using the clad pipe 15, the handle can be manufactured at low cost and with beauty.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, with half of the connecting and fixing part in a crimped and fixed state in cross section; Fig. 2 is a vertical sectional view thereof; Fig. 3 is a sectional view of the clad pipe;
5 is a perspective view of the handle, FIGS. 5 to 9 are cross-sectional views showing the fixing method in the order of steps, FIG. 10 is a sectional view of the lever receiver, and FIG. 11 is an exploded perspective view of the same. 1...Handle post, 2...Handlebar,
4... Handle lug, 6... Hole, 11... Inner ring, 12... Inside tube, 17... Core metal.

Claims (1)

[Claims] 1 A polygonal hole 6 is provided through the handle lug 4 fixed to the upper end of the handle post 1, and the hole 6
The tubular handlebar 2 is inserted into the handlebar 2, and rod-shaped core metals 17, 17 are press-fitted from both left and right sides into the inner ring 11 of a predetermined length inserted into the position corresponding to the hole 6 in the tube 12 of the handlebar 2. The inner ring 11 and the handlebar 2 are expanded by the core metals 17, 17, or the inner ring 11 and the handlebar 2 are expanded by applying hydraulic pressure, and the handlebar 2 is then inserted into the hole of the handle lug 4. 6. A method for fixing a handlebar, which is characterized by crimping.