JPH0216953Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a bicycle derailleur, and more particularly, to a bicycle derailleur in which the speed is changed by changing the chain to one of two or more chain gears having different diameters.

(Prior Art) Generally, in a bicycle derailleur, more specifically, in a front derailleur that is attached to the seat tube of a bicycle frame, and in a rear derailleur that is attached to the fork end of the back home of the frame, a pair of link members are attached to a fixed member. supports a movable member with a chain guide through the
A pair of adjustment bolts for adjusting the swing range of the link member is provided on one of the fixed member or the movable member and each of the link members, and a contact portion that comes into contact with the adjustment bolt is provided on the other side. The swing range of the link member to one side in the swing direction is restricted by the contact between one adjusting bolt and one contact portion, and the other adjusting bolt and the other contact portion are provided. The swinging range of the link member to the other side in the swinging direction is restricted by contact with the link member.

Conventionally, as a means to prevent the adjusting bolt from loosening, a stopper made of an elastic material having a through hole into which the adjusting bolt can be screwed has been used, as described in Japanese Utility Model Publication No. 19998-1983. use,
It has been proposed that this stopper is supported by the member on which the adjusting bolt is provided, and the adjusting bolt is screwed into the through hole to prevent loosening.

However, in existing derailleurs including this conventional derailleur, the contact portion between the adjuster bolt and the contact portion is not hidden and is exposed to the outside, so it may be blown off by the rotation of the wheel. Mud adheres to the contact area between the adjuster bolt and the contact portion, resulting in mud clogging, and as a result, even if the adjuster bolt is properly adjusted,
A problem occurred in that the swing range of the link member was out of order, resulting in poor gear shifting.

(Purpose of the invention) The present invention was devised in view of the above points, and the purpose is to be able to hide the abutting part between the adjusting bolt and the abutting part, and to ensure that the adjusting bolt is not loosened. The point is to be able to prevent this.

(Structure of the invention) Accordingly, in the present invention, a movable member having a chain guide is supported on a fixed member via a pair of link members, and one of the fixed member or the movable member and the link member includes: In the derailleur, the derailleur is provided with a pair of adjustment bolts for adjusting the swing range of the link member, and the other is provided with an abutment portion that comes into contact with the adjustment bolts, and at least one of the adjustment bolts is capable of being screwed into the derailleur. A concealing body for concealing the abutting portion between the adjusting bolt and the abutting portion is integrally provided on a rotation stopper made of an elastic material having a through hole, and a concealing body for concealing the abutting portion between the adjusting bolt and the abutting portion is integrally provided. This makes it possible to prevent mud from clogging the abutting portion, and also to reliably prevent the adjusting bolt from loosening.

(Example) Hereinafter, an example of the derailleur of the present invention will be described based on the drawings.

The illustrated derailleur is a front derailleur, and there is a tightening band attached to the seat tube of the bicycle.
The upper ends of a pair of first and second link members 5, 6 oriented in the vertical direction are pivotally supported via two pivot pins 3, 4 to a fixing member 2 fixed via a Two pivot pins 7, 8 at the lower end of 6
A movable member 10 having a chain guide 9 is supported in a freely swinging manner through the chain guide 9, and a return spring (not shown) is interposed between the first link member 5 and the chain guide 9. A pair of screw holes 21 and 22 are provided in the fixing member 2, and these screw holes 21,
A pair of adjusting bolts 11 and 12 are screwed into the fixing member 2 of the first link member 5.
The adjusting bolt 11,
A pair of abutting portions 13 and 14 are provided at a predetermined interval in the swinging direction of the first link member 5, and the adjustment bolts 11 and 12 are adjusted to allow the first link member 5 to swing. The range of movement, and ultimately the range of swing of the chain guide 9, is restricted. That is, the range of swing of the chain guide 9 toward the small diameter chain gear is restricted by the contact between the adjusting bolt 11 on one side and the contact portion 13 on the other hand, and the chain guide 9 is placed in a position corresponding to the small diameter chain gear. The swinging range of the chain guide 9 toward the large-diameter chain gear is restricted by the contact between the other adjusting bolt 12 and the other abutting portion 14, and the chain guide 9 is connected to the large-diameter chain gear. It is made to stop at the corresponding position.
Further, an operating arm 15 is provided at the end of the second link member 6 on the pivot side to the fixed member 2, and the link member 5 is pulled by pulling an operating wire (not shown) fixed to the tip of the operating arm 15. , 6 against the force of the return spring to move the chain guide 9 forward in the axial direction of the chain gear toward the large diameter chain gear, and by loosening the operation wire, the chain guide 9 is moved forward in the axial direction of the chain gear. 9 is moved back toward the small diameter chain gear by the restoring force of the return spring.

In the derailleur constructed as described above, this invention includes a rotation stopper 30 made of an elastic material such as synthetic resin or rubber and having a pair of through holes 31 and 32 into which the adjusting bolts 11 and 12 can be screwed. In addition, a concealing body 40 is integrally provided to hide the abutting portions between the adjusting bolts 11, 12 and the abutting portions 13, 14.

However, in the case shown in FIGS. 1 to 9, the support portion of the pivot pin 3 of the fixing member 2 is provided with a rear side surface 2a.
and the screw holes 21 and 22 by cutting out the lower surface 2b.
two receiving surfaces 23a, 23b perpendicular to the center of the
A recessed portion 23 having a guide surface 23c extending from the receiving surfaces 23a, 23b in the same direction as the center of the screw hole is provided, and the rotation stopper 30 has a contact surface that contacts the receiving surfaces 23a, 23b. The rotation stopper 30 is integrally provided with a plate-shaped concealing body 40 that closes the open portion of the recessed portion 23 toward the rear side surface 2a. It is inserted into the recessed part 23 and brought into contact with the receiving surfaces 23a, 23b, and the screw holes 21,
The adjusting bolts 11 and 12 screwed into 22
are screwed into the through holes 31 and 32 to support the rotation stopper 30 on the fixing member 2, and the adjustment bolt 11,
12 and the contact portions 13 and 14 are hidden.

Also, a through hole 31 provided in the rotation stopper 30,
Reference numeral 32 is a hollow hole having a smaller diameter than the outer diameter of the threaded portion of the adjusting bolts 11, 12 and a larger diameter than the root diameter of the threaded portion. 32, the inner surfaces of the through holes 31 and 32 are plastically or elastically deformed to forcibly screw the adjusting bolts 11 and 12 into the rotation stopper 30.
The adjustment bolts 11 and 12 are firmly held by the elastic restoring action of the material. In addition, the through holes 31, 3
2 may be provided with a thread groove on its inner surface. In this case, for example, the inner diameter of the threaded portion of the through holes 31, 32 is smaller than the root diameter of the adjusting bolt 11, 12, and the root diameter of the threaded portion of the through hole 31, 32 is set to be smaller than the root diameter of the adjusting bolt 11, 12. Either the diameter is smaller than the outer diameter of the threaded portion, or only one of the inner diameter and the root diameter of the threaded portion of the through holes 31 and 32 is made smaller than the outer diameter or the root diameter of the threaded portion of the adjusting bolts 11 and 12. The diameter of the adjusting bolts 11, 12 can be forcibly screwed in, and the adjusting bolts 11, 12 can be forcibly screwed in by the elastic restoring action of the inner surfaces of the through holes 31, 32. You just have to be able to hold it.

Further, in the recessed part 23 of the fixing member 2, there is a recessed locking part 2 that engages with the end of the rotation stopper 30.
3d, and a fitting recess 41 that fits into the fitting shaft part 3a provided at the tip of the pivot shaft 3 is provided in the concealing body 40 to prevent the locking part 23d of the rotation stopper 30 from engaging with the locking part 23d. The fixing member of the rotation stopper body 30 and the concealment body 40 when the adjusting bolts 11 and 12 are screwed into the through-holes 31 and 32 by fitting with the fitting shaft portion 3a of the fitting recess 41. 2 and movement of the adjusting bolts 11, 12 forward in the screwing direction. Note that the fitting recess 41
In addition to being provided through the concealing body 40 as shown in FIG. 6, they may also be provided without penetrating the concealing body 40 as shown in FIG. Further, the locking portion 23d, the fitting recess 41, and the fitting shaft portion 3a are not necessarily required.

In this case, for example, a receiving recess for receiving the rotation stopper 30 is provided at a position displaced from the recess 23 of the fixing member 2. In short, the through holes 31 and 3 of the adjusting bolts 11 and 12
It is sufficient that the locking member 30 is prevented from rotating with respect to the fixing member 2 and the adjusting bolts 11 and 12 are prevented from moving forward in the screwing direction.

Further, although the concealing body 40 is molded integrally with the rotation stopper 30, other rotation stoppers 3 may be used.
0 and may be formed separately and integrally joined by a joining means such as welding or fitting.

Therefore, the rotation stopper body 30 and the concealment body 40
To assemble, the rotation stopper 30 is inserted into the recess 23 of the fixing member 2, the tip of the rotation stopper 30 is engaged with the locking part 23d in the recess 23, and the concealment body 40 is assembled. The fitting recess 41 of the pivot pin 3 is fitted into the fitting shaft 3a of the pivot pin 3 to support the rotation preventing body 30 and the concealing body 40 with respect to the fixing member 2 so as not to be rotatable or movable. Screw hole 21 of fixing member 2,
Adjustment bolts 11 and 12 screwed into 22,
The rotation stopper 30 is fixed to the fixing member 2 by forcibly screwing into the through holes 31 and 32 of the rotation stopper 30. At this time, when the screwing operation of the adjusting bolts 11, 12 is stopped, the adjusting bolts 11, 12 are firmly held by the elastic restoring action of the elastic property of the material of the rotation stopper 30, so these adjusting bolts 11, 12 are firmly held. 1
1 and 12 can be reliably prevented from loosening, and the opening portion of the recessed portion 23 toward the rear side surface 2a of the fixing member 2 can be prevented by the concealing body 40 provided integrally with the rotation stopper 30. Since the contact portions between the adjusting bolts 11 and 12 and the contact portions 13 and 14 of the first link member 5 are hidden, it is possible to prevent mud from clogging the contact portions. Furthermore, it is possible to prevent the first link member 5 from falling off from the pivot pin 3.

In the embodiment described above, the fixing member 2 is provided with the recessed part 23, and the end of the first link member 5 on the pivot side to the fixed member 2 is arranged in this recessed part 23.
The recessed portion 23 is not necessarily required. but,
By providing this recessed portion 23, there is an advantage that when replacing the chain guide 9 or the like with a new one, the link member having the abutting portions 13 and 14 can be easily attached and detached.

In addition, a pair of screw holes 21 and 22 were provided in the fixing member 2, and the adjusting bolts 11 and 12 were screwed into the screw holes 21 and 22, but in addition, the fixing member 2
In addition, through holes having a diameter larger than the outer diameter of the threaded portions of the adjusting bolts 11 and 12 may be provided so that the adjusting bolts 11 and 12 are supported in these through holes.

In addition, although one concealing body was used to hide each of the abutting parts between the pair of adjuster bolts 11, 12 and the pair of abutting parts 13, 14, two other concealing bodies were used to hide each of the abutting parts. Two concealers may be used. In this case, two rotation stoppers 30 are also used.

Also, adjuster bolts 11 and 12 are attached to the fixing member 2.
However, in addition, this adjustment bolt 1
1 and 12 may be provided on either one of the link members 5 and 6 or on the movable member 10 including the chain guide 9.

Further, in addition to providing only the concealing body 40 on the rotation stopper 30, the concealing body 40 is provided at one end as shown in FIG.
A guide piece 33 facing 3c may be provided so that the first link member 5 is guided by this guide piece 33.

In addition, in the above explanation, the adjusting bolt 11,
12 and the contact portions 13 and 14 are constructed so as to hide the contact portions of the front derailleur exposed on the rear side surface 2a of the fixing member 2. As shown in FIG. 15, a window hole 24 is formed in the fixing member 2 and extends through the rear side surface 2a and the front side surface 2c, and the contact portion is exposed on the rear side surface 2a side and the front side surface 2c side. In this case, for example, a concealing body 40 is provided at one end of the rotation stopper 30 to close the open portion of the window hole 24 toward the rear side surface 2a, and the rotation stopper 30 is
The other end is inserted into the window hole 24, and the window hole 24 is inserted into the window hole 24.
A concealing body 40a is provided to close the open portion toward the front side surface 2c side, and the abutting portions of the adjusting bolts 11, 12 and the abutting portions 13, 14 are concealed by these concealing bodies 40, 40a. You can do it as you like. In this case, for example, one of the concealing bodies 40
is made bendable via a flexible portion such as a thin hinge, and with this concealment body 40 bent upward, the first link member 5 is inserted into the pivot pin 3, and then the concealment Return the body 40 to its original position and remove the pivot pin 3.
Alternatively, the end of the first link member 5 may be fixed to the tip of each of the concealing bodies 40, 40.
The pivot pin 3 may be inserted into the pin hole of the first link member 5 after the pivot pin 3 is inserted between the first link member 5 and the first link member 5.

In addition to the front derailleur, the derailleur of the present invention supports a movable member equipped with a chain guide having a guide pulley and a tension pulley on a fixed member via a pair of link members, and the fixed member or the movable member The same applies to the case of a rear derailleur in which a pair of adjustment bolts for adjusting the swing range of the link member is provided on one side of the link member, and a contact portion that comes into contact with these adjustment bolts is provided on the other side. It can be configured as follows.

(Effects of the invention) As described above, the present invention provides a rotation stopper made of an elastic material having at least one through hole into which the adjustment bolt can be screwed. Since a concealing body is integrally provided to hide the abutting part between the adjusting bolt and the abutting part, it is possible to prevent mud from clogging the abutting part between the adjusting bolt and the abutting part, thereby preventing gear shifting due to mud clogging. This makes it possible to prevent the adjustment bolt from loosening by utilizing the elastic properties of the rotation stopper, while preventing deterioration of the rotation preventive body. Therefore, once the swing range of the link member as a whole is adjusted, this good adjusted state and, by extension, good speed changeability can be maintained for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the derailleur of the present invention, Fig. 2 is a front view, Fig. 3 is a plan view, Fig. 4 is a rear view of only the main parts, and Fig. 5 is a rear view of only the main parts. A bottom view, FIG. 6 is a sectional view taken along the line of FIG. 4, FIG. 7 is a sectional view taken along the line of FIG. Figure 9 is a bottom view of the fixing member only, Figures 10 and 1
Figure 1 is a sectional view showing another embodiment, Figures 12 to 15 are still further examples, Figure 12 is a partially omitted perspective view, and Figure 13 is a diagram showing only the main parts. 14 is a sectional view, and FIG. 14 is a perspective view of only the fixing member.
FIG. 5 is a perspective view of only the rotation stopper and the concealment body. 2... Fixed member, 5, 6... Link member, 9...
...Chain guide, 10...Movable member, 11, 12
... Adjustment bolt, 13, 14 ... Contact part,
30... Rotating stopper body, 31, 32... Through hole, 4
0... Concealed body.

Claims (1)

[Scope of utility model registration request] A movable member having a chain guide is supported on the fixed member via a pair of link members, and one of the fixed member or the movable member and the link member,
In the derailleur, the derailleur is provided with a pair of adjustment bolts for adjusting the swing range of the link member, and the other is provided with an abutment portion that comes into contact with the adjustment bolts, at least one of which the adjustment bolts can be screwed together. A derailleur for a bicycle, characterized in that a rotation stopper made of an elastic material having two through holes is integrally provided with a concealing body for concealing a contact portion between the adjusting bolt and the contact portion.