JPS59206278A - Derailer for bicycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention provides a bicycle derailleur-1. Specifically, the present invention includes a base member, a movable member movable in the axial direction of a multi-stage sprocket device mounted on a bicycle, and a swing link that moves the movable member in the axial direction of the multi-stage sprocket device. The present invention relates to a bicycle derailleur comprising a feeding means of the same type and a guide mechanism supported by the movable member and guiding one drive chain to one sprocket of a multi-stage sprocket device. Generally, this type of derailleur is equipped with a return spring.
When changing gears by using the I operation section pulled by the operating wire, the movable member is moved forward and backward against the return spring, and when changing gears by loosening the operating wire lζ, the restoring force of the return spring causes the movable member to move forward and backward against the return spring. The movable member is configured to move backward. Accordingly, the return spring is a spring whose middle part is wound and both ends are extended outward in the tangential direction of the wound part, and the wound part of this spring is connected mainly to the link member and the base member constituting the feeding means. The spring is held around a pivot shaft connecting the movable member, and both ends of the spring are brought into elastic contact with the base member or the movable member and the link member. By the way, the return spring is attached, for example, by holding the winding WS around the pivot shaft, and with one end of the spring in contact with the base member or the movable member, and then attaching the other end of the spring to the base member or the movable member. Twist the coil in the direction in which the diameter of the wound portion decreases to flex the entire spring, and then tighten the other end of the spring. The link member 1 is attached by making elastic contact with the link member 1. However, in the case of a conventional derailleur that is taught as above,
Since the twisting stroke necessary when bending and lowering the return spring and the initial load on the feeding means are inevitably determined, when designing the return spring, it is necessary to select a spring that corresponds to the twisting stroke and initial load. A constant spring is used, and as a result, the characteristics of the return spring are specified, and as the amount of change in spring force with respect to the amount of deflection of this dwarf spring increases, and the number of gears increases, the restoring force of the spring increases. It gets bigger. Therefore, when changing the chain to the largest diameter sprocket of the multi-stage sprocket device, the restoring force of the return spring is extremely large, and the operating force of the operating lever that deflects the return spring to perform gear shifting becomes large, resulting in poor gear shifting operability. It was bad. It is an object of the present invention to reduce the amount of change in spring force relative to the amount of deflection of the return spring, reduce the operating force, especially the operating force required when changing over to a large diameter sprocket, and yet be able to provide a multi-stage sprocket device. Even when the gear shifting resistance that acts during gear shifting is greater than the normal resistance, that is, the gear shifting resistance when the driving chain is being driven, such as when the hanging drive chain is not being driven, the gear shifting operation can be performed. It is designed to store power. The present invention includes a base member, a movable member that is movable in the axial direction of a multi-stage sprocket device mounted on a bicycle, and a swing link type feeding means for moving the movable member in the axial direction of the multi-stage sprocket device. , a bicycle derailleur comprising a guide mechanism supported by the movable member and guiding the driving chain to one sprocket of the multi-stage sprocket device, the bicycle derailleur comprising an operating member operated by an external operation, the operating member being operated by an external operation. , a spring is swingably supported in the middle of the feeding means, and is held between the operating member and the base member around a support point of the operating member, and brings the operating member into elastic contact with the feeding means. interposed, the operating member is interlocked with the feeding means via the spring, one end side of the spring follows the movement of the operating member, and the holding part of the spring follows the movement of the feeding means. If the amount of change in spring force relative to the amount of deflection of the spring can be reduced by deflecting the spring, and if the shift resistance is greater than normal resistance, the shift operation force can be stored by deflecting the spring, and the shift operation can be performed reliably. He made it possible for them to do so. Next, the embodiments of the present invention will be reprinted based on the drawing numbers.
A guide mechanism (5) comprising a link mechanism consisting of a pair of link members (2), (3) and a movable member (4), and guiding the driving chain to each sprocket of the multi-stage sprocket device to the movable member (4). , and is configured so that the chino can be switched from one of the sprockets to another by moving the movable member (4) relative to the base member (1). Also, what is shown in the drawings is a rear derailleur that is used by attaching the base member (1) to a backhawk (not shown) that supports the rear wheel hub of a bicycle, and the guide mechanism (5) includes: a support body that freely swings and supports the movable member (4) via a first pivot (50);

[51] and the first
arranged coaxially with the pivot (50), said support

[51]
a guide pulley (56) rotatably supported via a cylindrical shaft (52) fixed to the support body (51); and a tension pulley (56) rotatably supported via a second pivot (54) at the free end of the support body (51). 55), a tension spring (56) is provided for biasing the support body (51) in a direction that applies tension around the axis of the first pivot (50) and tension of the chain; one end to the movable member (4),
The other end is locked to the support (51). Further, the movable member (4) is provided with a circular lumen (41) on its negative side as shown in FIG. The shaft (52) is pushed in and fixed with a fixing bolt (57). In the embodiment shown in the drawings, in the lower derailleur constructed as described above, the base member (1) g and the feeding means of the present invention are provided.

The clutch lever (60) constituting [6] is pivotally connected to Y, and the operating member (7) is swingably supported in the middle of the clutch lever (60), and the operating member (7) and the operating member (7) A spring (8) is interposed between the base member (1) and the spring (8) that holds the operating member (7) around the support point and brings the operating member (7) into elastic contact with the clutch lever (60). and the corresponding spring

[
8], the operating member (7) is connected to the clutch lever (6).
0') The operation member is interlocked with the

[7] Attach the fixture (9) of the guard operating wire (W) to the base member (1).
) is provided with a support (10) for the outer tube (0) that guides the wire (W), and the end of the clutch lever (60) is extended toward the movable member (4). , extending in the same direction as the first pivot shaft (50), and extending in the same direction as the first pivot shaft (50) at an opposing portion of the movable member (4) facing the extension portion.
A bushing rod (11) movable in the axial direction of the pivot 111 (50) is provided, and the clutch lever (60) and bushing rod (11) K are provided between the movable member (4) and the guide mechanism (5). A control body (12
) and a clutch (13) that is engaged and lowered by the operation of the control body (12).The clutch lever (6) constituting the feeding means (6)
0], for example, is formed in a rod shape extending from a supporting position to the base member (1) toward the movable member (4). As shown in FIG. 6, the operating member (7) includes a shaft (71) extending in a direction perpendicular to the operating surface of the clutch lever (60), and a shaft (71) extending in a direction perpendicular to the shaft (71). an operating arm (72) extending toward the clutch lever (60), and an interlocking arm (76) extending from the middle of the operating arm (72) toward the clutch lever (60).
and one end of the shaft body (71) is connected to a cylinder shaft (14).
The interlocking arm (76) is pivotally supported in the middle in the longitudinal direction of the clutch lever (60) through the clutch lever (60), and the distal end of the interlocking arm (76) is brought into contact with the clutch lever (60).

The fixture (9) is attached to the tip of [72]. Moreover, the spring (8) is wound in the middle, and one end (8a) is connected to the winding part.

[8b] outward in the axial direction, and the other end (8C
) to the winding part

Using springs extending outward in the tangential direction of [8b], the winding portion (8b) of this spring (8) is held freely rotatable around the shaft (71) of the operating member (7). At the same time, the one end (8a) is rotatably locked to the operating arm (72) of the operating member, and the other end (80) is attached to the receiving part (1a) provided on the base member (1). When the spring is in elastic contact with the

[8] The one end (8a) side is displaced in accordance with the operation of the operating member (7), and the winding portion (8b) is displaced in accordance with the operation of the clutch lever (60). The receiving part on the other end (8C) side (
1 &) so that the amount of change in the force of the spring (8) relative to the amount of deflection of the spring (8) can be reduced. In addition, the illustrated spring

[8] is the movable member due to the restoring force due to deflection.

[4] The function of the return spring to move back,
When the check 2 is not driven, etc., the operating wire (
Even when the shift resistance that acts when towing W) and shifts gears is greater than the normal resistance or the shift resistance when the part check 2 is being driven, the operating wire can be operated and this operating force can be stored. It has the function of a saver spring that moves the operating member (7) to the clutch lever (60) in the case of normal speed change resistance, and when the speed change resistance is larger than the normal resistance, the Operation member (7)...J mark spring

[8] The above-mentioned clutchle) < (60)
The clutch lever (60) is operated by the restoring force of the spring (8) when the large shift resistance is released, that is, when the drive chain starts to drive. At the same time, the guide mechanism (5) is moved to a predetermined gear position by operating the operating wire (W). Cylindrical shaft (
52] has a cylindrical shape with an inner diameter larger than the outer diameter, and has an inclined cam surface (12a) displacing in the axial direction in the circumferential direction on one end surface in the axial direction, and on the other end surface. In addition to providing the clutch protrusion (12b), the guide pulley (12b) is also provided.
53], the control body

[12] is provided with a clutch protrusion (53) opposite to the clutch protrusion (12b).
A) is provided. The control body (12) controls the movable member (4).
The inner lumen (41) is freely movable along the axial direction of the cylinder shaft (52) outwardly from the outer circumferential surface of the cylinder shaft (52), and the bushing rod (°12) F , the cam surface (12a) of the control body (12) is faced, and the bushing rod

Due to the movement of [11], the control body (12)
)7i: @ It is formed by extruding outward in the axial direction of the cylinder shaft (52). Further, a spring receiving guide (12c) protruding radially outward is provided on the outer circumferential surface of the control body (12), and this guide ('120) and the guide pulley (5
A return spring (15) is interposed between the control body (12) and the N bushing rod (11). (
12] Push back to the bushing rod (11) side, that is, the control body (12) and the guide pulley

Clutch projections (12b) and (53a) provided on [53]
) is maintained in a non-occlusal state, and the embodiment shown in the drawings is designed as follows. That is, when the chino is hung on one sprocket of the multi-stage sprocket device, there is play between the side surfaces of the teeth of the sprocket and the inner surface of the inner link plate of the chino, and the guide mechanism (5 ] When moving in two axial directions, the chino first moves to absorb the play, and then detaches from the sprocket and moves toward the sprocket to be replaced. In the embodiment shown in the drawings, By using the return spring (15), when changing the chain, the movable member (4) and the guide mechanism (5) are moved before the braking body (12) is forcibly moved by the cam surface +121L). Said return spring (15) 7
i: The spring force of the return spring (15) is made larger than the movement resistance of the movement of the chino to absorb the play. Next, the operation of the derailleur constructed as above will be explained based on FIG. 2 and FIG. 6.7. What is shown in Figure 2 is a movable member.

[4] and a guide mechanism (5) are located on the small-diameter sprocket side of the multi-stage sprocket device, and the chino guided by the guide mechanism (5) is replaced by the small-diameter sprocket, When the operating wire (W) is pulled from this state, the operating member (7) swings clockwise in FIG. 2 against the spring (8), thereby bending the spring (8). , when the chino is driven, Tl
fU spring

[8] Through the clutch lever (60)
swings clockwise, and the bushing rod

[11] The control body (12) is connected to the return spring via [11].

[15] is pushed outward in the axial direction of the cylindrical shaft (52), and is supported by the clutch lever (60) due to the swinging of the clutch lever (60). 7) The support point is displaced from position A to position B by g + g in Figure 5, and the above-mentioned

[
8) is bent by an amount corresponding to the angular difference (θ2-θ1) between the torsion angle (0 fold) at the A position and the torsion angle (θ寞) at the B position, and this (θ-01 ) is the restoring force of the spring (8). Therefore, even when replacing the chuck with the largest diameter sprocket of a multi-stage sprocket device, the spring (8)
The amount of deflection of the spring (8) can reduce the amount of change in the force applied to the spring (8), and the recovery resistance of the operating lever that provides rotational resistance that overcomes the restoring force of the spring (8) can be reduced. The clutch projection (12a3) is engaged by pushing out the control body (12), but in the embodiment shown in the drawings, prior to this engagement, The movable member (4) and the guide mechanism (5) are moved via the return spring (12). That is, the spring (8) is killed by the swinging of the operating member (7), and the The movable member (4) is connected to the link member (2).
) and (3), the operating force acting on the clutch lever (60) via the return spring (15) is applied to the movable member (4) and the guide mechanism. (5) The movable member (4) is
The guide mechanism (5) moves to the large diameter side of the multi-stage sprocket device, and the play of the chino with respect to the small diameter sprocket is absorbed. When this play is absorbed, the return spring (15) is compressed, and the clutch protrusion (12b>' + <53a) is engaged. And the clutch (12b), (53&)
When engaged, since the guide pulley (53) was previously rotated by the drive of the chain, the control body (12) rotates and engages with the cam surface (31a) of the control body (12). Based on the bushing rod (11) that fits together, the control body (1
2) tries to move against the bushing rod t11)j as shown in FIG. At this time, the bushing rod (11) is locked and fixed to the pace member (1) by the operating wire (W) via the clutch lever (60), so that the movable member [4] and the guide mechanism (5),
The chain is forcibly moved forward to the large diameter sprocket via the link members (2) and (6). From this forward movement, the chino guided by the guide mechanism [5] moves toward the large diameter sprocket. The guide pulley (53) of the control body (12)
) After moving together with the movable member (4) and the guide mechanism (5) due to the accompanying rotation, the bushing rod

[
11] falls to the bottom of the cam surface (12a) of the control body (12), so the control body (12) returns under the action of the return spring (15) and the clutch lever (
60], the positional relationship of the bushing rod (11) and the control body (12) returns to the original position shown in Figure 2. Also, after replacing the large diameter sprocket as described above, replace the small diameter sprocket (4). In this case, the operation wire (W) is loosened, and when the wire twt v is loosened, the operation member (7) is loosened by the action of the spring I (8).
] and the clutch lever (60) swings counterclockwise in FIG.
) and guide mechanism (5)? By this double movement, the small diameter side sprocket of the chain is replaced. Further, when changing the sprocket from the small diameter sprocket to the large diameter sprocket, when the operating wire (W) is pulled while the chino is stopped without being driven, the spring (8) is bent and stores energy. When the cheno is driven, the clutch lever

60) is operated, and the chino is replaced with the larger diameter sprocket by the above-described operation. In the embodiment described above, the clutch lever (60) was used as the feeding means [6].
) without using the link member (2) or (3)
may be used as a feeding means. In this case, the operating member (7) is swingably supported in the middle of the link member (2) or (6), and the guide mechanism

[5]
For example, a known structure is used, which is composed of a hanging frame, a guide pulley and a tension pulley supported by the hanging frame, and in which the hanging frame is pivotably supported on the movable member. Also, a fixture for the wire (W)

In addition to being provided on the operating member (7), [9] may be provided on the base member (1), and a support (10) for the outer cylinder (0) may be provided on the operating member (7). As described above, the present invention provides a base member, a movable member that is movable in the axial direction of a multi-stage sprocket device mounted on a bicycle, and a swing link type feeding means that moves the movable member in the axial direction of the multi-stage sprocket device. and a guide mechanism, an operating member operated by external operation is provided, the operating member is swingably supported in the middle of the feeding means, and the operating member and the pace member are a spring is interposed to hold the operating member in a fixed position and bring the operating member into resilient contact with the feeding means;
Since the operating member is interlocked with the feeding means through the spring, during speed change operation, one end 1111 of the spring follows the movement of the operating member, and the holding end of the spring follows the operating number of the feeding means. By displacing the spring, the amount of change in the spring force with respect to the amount of deflection of the spring can be reduced. For example, if the spring has the restoring force necessary for one-speed shifting, even if the number of gears increases, the restoring force of the spring can be expressed in mJ. This allows you to shift gears reliably using the . Therefore, the force that overcomes the spring can reduce the operating force of the operating lever for shifting the gear.
Even when changing the drive chain to the largest diameter sprocket of a multi-stage sprocket device, it can be easily operated with a small operating force, improving shift operability.
6) It can be done. Moreover, when the shift resistance is greater than the normal resistance, the spring is flexed to store energy in the shift operation, and the shift operation can be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the derailleur of the present invention, Fig. 2 is a cutaway bottom view, Fig. 6 is a partial enlarged sectional view, Fig. 4 is a perspective view of only the control body, and Fig. 5 Explanatory text showing the operation of the spring, and FIGS. 6 and 7 are enlarged bottom views corresponding to FIG. 2 showing the operating state. (1)...Pace member (4)...Movable member (5)...Guide mechanism (6)...Feeding means (7)...Operation member (8)...Spring agent Patent attorney Shizu 1) Naohisa No. 31A Figure 5 4■ 2b Procedural amendment 1. Description of the case 1981 Patent Application No. 81430 2 Name of the invention Bicycle derailleur 3 Person making the amendment Relationship to the case Applicant Address 3-77 Oimatsucho, Sakai City, Osaka Prefecture @ (243) Shimano Kogyo Address: 5 Yonezawa Building, 1-9-9 Sumiyoshibashi-cho, Sakai-shi, Osaka 590 Date of amendment order From: 1, [Memorandum], page 14 In line 7, the word ``displaced'' and the sum are corrected as follows. [While being displaced, the other end (8C) of the spring (8) and the receiving portion

A relative movement occurs between the spring (8) and the spring (8).
) is displaced in the same direction as the rocking direction of the clutch lever [60], and 2) "But," and "But," on page 14, line 14 of the same page, "the spring (8) ” and add the following sentence between them. [The spring (8) follows the movement of the clutch lever (60)]
is relatively interlocked with the catch f915 (1a), and the winding part (8b) of the spring (8) is connected to the clutch lever (60).
) can be displaced in the same direction as the swing direction of
”

Claims (1)

[Claims] a base member, a movable member capable of moving in the same direction in the axial direction of the multi-stage sprocket device mounted on the bicycle; a swing link type feeding means for moving the movable member in the axial direction of the multi-stage sprocket device; A bicycle derailleur equipped with a guide mechanism supported by a movable metal wheel and guiding a drive chain 2 to one sprocket of a multi-stage sprocket device.
An operating member operated by an external operation is provided, the operating member is swingably supported in the middle of the feeding means, and the operating member is provided between the operating member and the base member. A bicycle derailleur-0, characterized in that the operating member is held at a supporting point layer, a spring is interposed for elastically contacting the operating member with the feeding means, and the operating member is interlocked with the feeding means via the spring.