JPH0133440Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle gear shift operating device, and more particularly, to a gear shift operating device for operating a bicycle derailleur to change gears by rotating a control lever.

In general, this type of speed change operating device includes a band member that is wrapped around a bicycle frame, a lever shaft, and an operating lever that is rotatably supported on the lever shaft, and the diameter of the band member is reduced by tightening a mounting screw. The operating lever is fixed to the frame, and is configured to provide resistance to rotation of the operating lever by resistance providing means such as a tightening screw and a friction plate.

However, in this case, since the mounting screws for fixing the band member protrude to the outside, there is a high risk that a part of the body or clothing may be caught on the protrusion, and there is also the problem of spoiling the appearance. .

Therefore, conventionally, as shown in Japanese Utility Model Publication No. 53-54015, a nut having a pair of engaging parts is hooked between both ends of the band member, the nut is covered, and the frame is A fixed base having legs that abuts the base is provided, an operating lever is rotatably supported on the outer periphery of the fixed base, and a tightening screw passing through the fixed base and the boss of the operating lever is screwed into the nut. and fixing the fixing base to the frame, and screwing a nut onto the end of the tightening screw,
It has been proposed that the lever is provided with rotational resistance.

However, in the case of the conventional structure of the lever, the above-mentioned problem can be solved because the mounting screw is eliminated, but on the other hand, the control lever is supported on the outer periphery of the fixed base without using a lever shaft. , it is not possible to use an operating lever with a general support structure that supports the operating lever on a lever shaft, and a resistance applying means that provides resistance to the rotation of the lever, and these operating levers and resistance applying means lack versatility. There was a problem in that it had to be specially formed, resulting in high costs.

The present invention was devised in view of the above points, and the purpose is to use a lever shaft that supports the operating lever, and to fix the band member and the fixing base to the bicycle frame with this lever shaft, and to keep the fixing base fixed. The object of the present invention is to enable an operating lever having a general support structure in which an operating lever is supported on a lever shaft to be supported on the lever shaft.

Therefore, the configuration of the present invention is such that an engaging body that engages with a band member wrapped around a bicycle frame has a fixed shaft protruding from the engaging body, and has legs that cover the engaging body and abut against the frame. A fixed base is provided, the fixed shaft is passed through the fixed base, a lever shaft is screwed to the shaft end of the fixed shaft passing through the fixed base, and the fixed base is fixed to the fixed base by screwing the lever shaft. Although the control lever is fixed to the frame, the control lever is rotatably supported on the lever shaft, so that it is possible to use a control lever with a general support structure in which the control lever is supported on the lever shaft. This allows for easy assembly with the fixed base and lever shaft fixed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gear shift operating device of the present invention will be described below with reference to the drawings.

The speed change operation device of the present invention consists of a substantially C-shaped band member 1 that is wrapped around a bicycle frame F, and a pair of upright pieces 11, 1 having locking holes 11a, 12a at both ends.
2, and a pair of engaging portions 2 are provided on these upright pieces 11 and 12 to engage with each of the locking holes 11a and 12a.
1 and 22, a fixed shaft 3 having a threaded portion 31 on the outer circumferential surface is integrally protruded from the engaging body 2, and the engaging body 2 and the upright piece 11 . A lever shaft 5 having a screw hole 51 is screwed onto the shaft end threaded portion 32 passing through the base 4,
The fixing base 4 is fixed to the frame F by screwing the lever shaft 5, while the boss portion 61 of the operating lever 6 is rotatably supported on the outer peripheral surface of the lever shaft 5, and the lever shaft 5 A tightening screw 7 screwed into the screw hole 51 of the lever 6, and the tightening screw 7 and the lever 6.
The rotation of the lever 6 is provided with resistance by a resistance providing means such as a friction plate 8 interposed between the lever 6 and the lever 6.

In the above configuration, the engaging body 2 is formed into a rectangular shape with a length slightly longer than the length between the upright pieces 11 and 12, and the fixed shaft 3 is provided protruding from the upper surface of the central portion in the longitudinal direction. It is.

The fixing base 4 has an upper surface as a bearing surface for the lever shaft 5 and a lower surface as an abutment surface for the frame F, and as shown in FIG. A substantially H-shaped through hole 42 for receiving the upright pieces 11 and 12 is provided to hide the engaging body 2 and the upright pieces 11 and 12, and to move the fixed shaft 3 outward from the upper surface of the fixed base 4. When the lever shaft 5 is screwed onto the fixed shaft 4,
The tips of the upright pieces 11 and 12 are made to protrude from the through hole 42 to the upper surface of the fixing base 4.

Further, the lever shaft 5 has a screw hole 54 in the center, and a flange 5 at one end of the support portion 52.
3 is formed into a cylindrical shape with a flat surface 54 on the other end side, and the screw hole 51 portion is screwed onto the fixed shaft 3, thereby forming the flange 53.
At the same time, the side end surface is brought into contact with the upper surface of the fixed base 4 and the fixed base 4 is pressed against the frame F side,
pulling up the engagement body 2 to reduce the diameter of the band member 1;
This band member 1 and the fixing base 4 are fixed to the frame F. The friction plate 8 and the top cover 9 are supported on the flat surface 54 of the lever shaft 5 in a non-rotatable manner and can be moved freely in the axial direction. The friction plate 8 is pressed against the operating lever 6 to provide resistance to the rotation of the lever 6.

Further, the operation lever 6 has a boss portion 61,
A shaft hole 62 that fits into the support portion 52 of the lever shaft 5
has been established. The illustrated operation lever 6 is provided with a circular cavity 63 having a tapered surface that comes into contact with the friction plate 8 at one end of the shaft hole 62.
An inner cavity 65 having a protrusion 64 is provided at the other end of the shaft hole 62 . A stopper 43 that can engage with the protrusion 64 is provided on the upper surface of the fixing base 4, and the rotation range of the lever 6 is regulated by the engagement of the stopper 43 with the protrusion 64.

In addition, 10 in the figure is supported on the outer peripheral part of the said fixed base 4, and the space|interval between the said operating lever 6 and the fixed base 4 is adjusted, and the inside from the gap part between the said lever 6 and the fixed base 4 is This is a ring-shaped spacer that prevents rainwater from entering.

However, when attaching the shift operating device configured as above to the bicycle frame F, the band member 1
is fitted to the outer periphery of the frame F with its both ends expanded, and the rising pieces 11 and 12 of this band member 1
The engaging body 2 is hooked between them, and the through hole 42 portion of the fixing base 4 is connected to the engaging body 2 and the upright pieces 11, 12.
The fixing shaft 3 is made to protrude outward from the upper surface of the fixing base 4, and the lever shaft 5 is screwed onto the fixing shaft 3, so that the fixing base 4 and the band member 1 are attached to the frame F. It is fixed. In this state, the operating lever 6 is inserted into and supported by the lever shaft 5, and the resistance applying means, such as the tightening screw 7, is tightened into the threaded hole 51 of the lever shaft 5.
It provides rotational resistance to the Therefore, in the case of the present invention, it is possible to use an operating lever with a general support structure for supporting the operating lever 6 on the lever shaft 5, and a resistance applying means, and also with the fixed base 4 fixed to the frame F. Since the operating lever 6 can be supported on the lever shaft 5, the operating lever 6 can be assembled easily and efficiently.

In the case of the embodiment described above, there is a risk that the lever shaft 5 may loosen due to repeated gear shifting operations, but this loosening of the lever shaft 5 can be prevented by, for example, the following configuration.

That is, as shown in FIG. 2, a cylindrical stopper 20 is non-rotatably fitted around the outer periphery of the flange 53 of the lever shaft 5, and this stopper 20 and the fixing base 4
A locking groove 44 is provided on one side of the locking groove 4, and a locking groove 44 is provided on the other side of the locking groove 44.
4 are provided with engaging protrusions 20a that engage with each other,
After the lever shaft 5 is screwed onto the fixed shaft 3, the rotation stopper 20 is fitted around the outer circumference of the flange 53,
The engagement protrusion 20a and the locking groove 44 are engaged with each other. In order to prevent the lever shaft 5 from loosening, for example, a spring washer may be interposed between the lever shaft 5 and the fixed shaft 3, or a spring washer may be inserted between the lever shaft 5 and the fixed shaft 3. By applying adhesive to the threaded part 3, it is possible to prevent the lever shaft from loosening.

As described above, the present invention provides a fixing shaft that protrudes from an engaging body that engages with a band member wrapped around a bicycle frame, and that has legs that cover the engaging body and abut against the frame. A base is provided, the fixed shaft is passed through the fixed base, a lever shaft is screwed to the end of the fixed shaft passing through the fixed base, and the fixed base is attached to the frame by screwing the lever shaft. Since the operating lever is rotatably supported on the lever shaft while being fixed, an operating lever with a general support structure for supporting the operating lever on the lever shaft and a resistance imparting means for resisting the rotation of the lever are used. This makes it possible to significantly reduce the overall cost compared to the above-mentioned conventional products that require specially formed operating levers and resistance applying means.Moreover, the fixed base can be fixed to the bicycle frame. Since the operating lever can be supported on the lever shaft, the operating lever can be assembled easily and efficiently.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the speed change operating device of the present invention, Fig. 2 is a plan view with the operating lever omitted, Fig. 3 is a sectional view taken along the line of Fig. 1, and Fig. 4 shows the fixing base. It is an exploded view of the state where it is fixed and the operation lever is removed. DESCRIPTION OF SYMBOLS 1... Band member, 2... Engaging body, 3... Fixed shaft, 4... Fixed base, 5... Lever shaft, 6... Operating lever.

Claims (1)

[Scope of utility model registration request] A fixing shaft is provided protruding from an engaging body that engages with a band member wrapped around a bicycle frame, and a fixing base is provided that covers the engaging body and has legs that come into contact with the frame. The fixing shaft is passed through the fixing base, a lever shaft is screwed to the end of the fixed shaft passing through the fixing base, and the fixing base is fixed to the frame by the screwing of the lever shaft; A bicycle gear shift operating device, characterized in that an operating lever is rotatably supported on the lever shaft.