JPH0427686A - Brake device for bicycle - Google Patents

Abstract

PURPOSE:To provide an enough leading effect from the initial stage of brake by intercoupling a reference member in a position where a member on the moving side having a brake shoe is displaced away from a pivotal support axis and on a member on the stationary side and a reference member in a position where the member on the moving side is displaced away from the pivotal support axis and on the member on the moving side through a regulating member. CONSTITUTION:A member 5 on the moving side is movable in a direction extending approximately along a rim rotation direction W from a member 3 on the stationary side. A first reference member 19 in a position where the member 5 on the moving side is displaced away from a pivotal support axis Y and on the member 3 on the stationary side and a second reference member 20 in a position where it is displaced away from the pivotal support axis Y and on the member 5 on the moving side are intercoupled by means of a regulating member 21 capable of constraining a distance L between the reference parts 19 and 20 at a specified value. The reference parts 19 and 20 are arranged in a displaced state around the pivotal support axis Y so that a brake shoe 4 is slid in a direction, in which the brake shoe is brought into pressure contact with a rim R, along with movement of the member 5 on the moving side toward a front in a rim rotation direction W. This constitution converts a front force F in a rim rotation direction, exerted on the brake shoe 4, into a rim pressure contact force G through the regulating member 21 to provide a leading effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bicycle braking device with a so-called leading effect. More specifically, a movable member having a brake shoe is pivotally supported on a fixed member attached to a bicycle frame so that the brake shoe can move near and far with respect to the rim, and the movable member is fixed to the fixed member. The brake shoe is configured to be movable in a direction substantially along the rotational direction of the rim relative to the side member, and the brake shoe is moved against the rim by a forward force in the rotational direction of the rim applied to the brake shoe while the brake shoe is in contact with the rim. The present invention relates to a bicycle braking device that is brought into pressure contact with a bicycle brake device.

[Prior Art] Conventionally, in the above-mentioned bicycle braking device, a forward force in the rim rotational direction is applied to the brake shoe due to a frictional force with the rim when the brake shoe is in contact with the rim, and the brake shoe is A cam device has been used as a mechanism (hereinafter referred to as a ``leading mechanism'') to forcefully press the rim against the rim (hereinafter, this type of effect will be referred to as a ``leading effect'').

That is, the movable side member is fitted around the shaft extending from the fixed side member so as to be able to swing freely, and the movable side member is provided with a plurality of circular rotation forces l provided on the outer periphery of the shaft, and grooves provided on the movable side member. A plurality of cam followers were brought into sliding contact with each other to convert the linear motion of the movable member into a swinging motion about the shaft.

[Problem to be solved by the invention]

However, according to the above-mentioned conventional configuration, at the initial stage of the brake shoe's contact with the rim, the forward force in the rotational direction is still small due to the insufficient pressure contact force of the brake shoe against the rim. Because the frictional resistance of the device was extremely large, its leading effect could not be fully demonstrated. Moreover, if sand or the like gets stuck in the cam groove, the frictional resistance of the cam mechanism becomes even greater, which reduces the -layer leading effect.

Furthermore, in addition to having to finish the cam device with high precision, it is also necessary to shield the entire cam device to prevent the sand from getting caught in it, resulting in a complicated structure and increased cost. There was also the problem of high prices.

It is an object of the present invention to have a simple structure and be manufactured at low cost, to sufficiently exhibit a leading effect from the initial contact of the brake shoe with the rim, and to prevent the performance from being degraded even when sand or the like is caught. The purpose of the present invention is to provide a bicycle braking device with a reduced number of uses.

[Means for Solving the Problems] In order to achieve the above object, the characteristic configuration of the bicycle braking device according to the present invention is that a movable side member having a brake shoe is attached to a fixed side member attached to the frame of the bicycle.
The brake shoe is pivotally supported so as to be movable toward and away from the rim, and the movable side member is configured to be movable in a direction substantially along the rotational direction of the rim relative to the fixed side member, and the brake A configuration in which the brake shoe is brought into pressure contact with the rim by a forward force in the rim rotation direction applied to the brake shoe in a state where the shoe is in contact with the rim, and the brake shoe is in pressure contact with the rim at a position offset from the pivot axis of the movable side member. A first reference part on the fixed side member and a second reference part on the movable side member at a position away from the pivot axis, and the distance between the first reference part and the second reference part is determined. The first reference part and the second reference part are interlocked and connected by a regulating member that regulates them in a constant manner, and as the movable member moves forward in the rim rotation direction, the brake shoe moves in the rim pressure contact direction. The reason for this is that they are arranged so as to be shifted around the pivot axis so as to swing.

(Function) According to the characteristic structure of the present invention described above, as shown in FIG.
The movable member (5) having the brake shoe (4) is movable in a direction substantially along the rim rotational direction with respect to the fixed member (3), and the movable member (5) has the brake shoe (4).
4) can be moved near and far with respect to the rim (R). Further, the first reference portion (1
9) and a second reference part (20) on the movable member (5) at a position away from the pivot axis (Y), between the first reference part (19) and the second reference part. (20) Distance (L
) are interlocked and connected by a regulating member (21) that can be fixedly restrained, so the movable member (5) is connected to the fixed member (3).
), the movable member (5) will necessarily swing around the swing center axis (Y) accordingly. For example, both the reference parts (19) and (2Q) along the moving direction (D) of the movable side member (5)
If the movable member (5) is moved so as to increase the distance between M1 in FIG. 1 and M2 in FIG. This results in a clockwise oscillation as shown in the figure.

As shown in FIGS. 3 and 4, the first reference part (19) and the second reference part (20) are connected to the front of the movable member (5) in the rim rotation direction (-). Since the brake shoes (4) are arranged to be shifted around the pivot axis (Y) so that the brake shoes (4) swing in the direction of pressure contact with the rim (R) as the brake shoes (4) move toward the rim (R), the brake shoes (4) comes into contact with the rotating rim (R), and the brake shoe (
The forward force (F) in the rim rotation direction acting on the rim (4) is converted into a rim pressure contact force (G) that presses the brake shoe (4) against the rim (R) pressure side via the restriction member (21). . In this way, the leading effect is demonstrated.

In addition, in FIGS. 1 and 2, the second reference part (20) is arranged more forward in the rim rotational direction (-) than the first reference part (19), and the first reference part (19) ) and the second reference part (20) as the movable member (5) moves forward in the rim rotational direction (-). 20) connecting the reference line (X5
1. The pivot axis ( Y), but both reference parts (1
9) When the front-back relationship in (20) is reversed, as shown in FIGS. 8 and 9, the acute angle (α) is in the forward direction (−) of the rim rotation direction of the movable member (5). What is necessary is to configure it so that it increases with movement toward .

Since it is sufficient for the regulating member (21) to restrict the distance (L) between the first reference part (19) and the second reference part (20) to a constant value, the regulation member (21) is more effective than a structure using a cam device. The contact area in the movable part is significantly reduced, and accordingly, the frictional resistance around the regulating member (21) is significantly reduced. Therefore, the conversion efficiency of converting the rim rotation direction forward force (F) acting on the brake shoe (4) into the rim pressure contact force (G) is greatly improved, and as a result, the brake shoe (4)
The leading effect can be fully demonstrated from the initial stage of contact with the rim (R).

In addition, since it is sufficient for the regulating member (21) to swing relative to the fixed side member (3), some sand or the like may be removed from the regulating member (
21) Even if it bites into the vicinity, its swinging is not substantially inhibited and the leading effect can be fully exhibited. Therefore, there is almost no need to provide a shield against sand and the like as described above, and together with the simple structure of simply providing the regulating member (21), the cost of the device can be reduced significantly.

[Effects of the Invention] As described above, according to the present invention, the structure is simple and can be manufactured at low cost, and the leading effect can be sufficiently exhibited from the initial stage of contact of the brake shoe with the rim. It has now become possible to provide a bicycle braking device in which there is little risk of deterioration in performance. Furthermore, the performance and multiplicity of the brake system for bicycles on rough roads where sand, mud, etc. are scattered has been improved, and it has become possible to contribute to safe riding for cyclists.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1, 3, and 5 show a cantilever type bicycle braking device (2) specially provided on two front forks (1) for so-called mountain hiking. A fixed side member (3) attached to each front fork (1) swingably supports a movable side member (5) having a flake shoe (4). A center wire (6) is passed through the tip of each movable side member (5), and an operation wire (6) extending from a brake operation device (not shown) is connected to the center wire (6).
A wire holder (8) connected to the center wire (7) is locked to the middle portion of the center wire (6). By pulling the intermediate portion of the center wire (6), each brake shoe (4) is applied to the rim (R) from both sides while resisting the biasing force of a torsion coil spring (18), which will be described later. ) in close proximity to each other to brake the bicycle. In this example, the braking device on the right hand side when facing the front side in the direction of bicycle travel will be explained.
As a general rule, the items located on the left hand side may be configured with the left-right relationship reversed from those on the right hand side.

The fixed side member (3) includes a pedestal (9) and a shaft member (10).
It becomes more. The pedestal (9) includes a fixed-side cylindrical portion (11) having a bottomed cylindrical shape and a fixed-side extending portion (12) extending to one side of the cylindrical portion. ) A through hole (lla) is formed at the bottom of the hole. On the other hand, the shaft member (10) has male screws (10a) at both ends thereof.
(1'Ob), and a flange (10c) is provided at the intermediate portion thereof. Then, the mounting hole (1b) of the mounting part (1a) provided on the front fork and the pedestal (
9) and the shaft member (10).
) is inserted through the shaft member (10) and tightened with the male screw (10a) at the one end and the nut (10d), and the shaft member (10) extends forward approximately along the rotational direction (-) of the rim (R). In the extended state, the pedestal (9) member and the shaft member (
10) and is attached to the front fork.

As shown in FIGS. 5 and 7, the movable member (5) includes a cylindrical portion (13) that fits onto the shaft member (10), and the upper side of the cylindrical portion (13) Gradually the rim (R
) The arm portion (14
), and a movable side extension part (15) is provided on the lower side thereof. Further, the brake shoe (4) is attached to the rim (
It consists of a rubber member formed long along the rotational direction (-) of the rim (R), and a metal mounting shaft (
4a) is extended. Then, the arm portion (14
) through the brake shoe fixture (16) provided in the middle of the brake shoe (4) and the mounting shaft (4a).
is fixed to the arm portion (14). Furthermore, a movable cylindrical part (17) that fits inside the fixed cylindrical part (11) is provided at one end of the cylindrical part (13).

The shaft member (10) extending from the fixed side member (3)
The cylindrical portion (13) of the movable member (5) is fitted onto the outside of the movable member (5) to pivotably support the movable member (5) relative to the fixed member (3). Shaft member (lO)
The movement is also allowed in the longitudinal direction. On the other hand, the shaft member (10
) is provided with a torsion coil spring (18) fitted externally to the fixed side member (3), and the spring legs at both ends of the torsion coil spring (18) are fitted onto the fixed side member (3).
and the movable side member (5), and urges the brake shoe (4) of the front rudder movable side member (5) away from the rim (R).

In this embodiment, in order to obtain the above-mentioned leading effect, firstly, as shown in FIG. 1 and FIG. , the second reference part (20) at the tip of the movable side extension part, and the distance between the first reference part (19) and the second reference part (20) M (
L) are interlocked and connected by a regulating member (21) that can be restrained to a certain degree, and secondly, these reference parts (19) and (20) are arranged in a special relationship.

First, with the above-described configuration, the second reference section (20)
is greater than the first reference portion (19) in the rim rotation direction (
−) It will be located on the front side. The same standard part (19
) and (20) are formed with through holes (19a) and (20a), respectively, through which the regulating member (21) is inserted, and the regulating member (21) is continuously inserted into the through holes (19a) and (20a). ) a spherical recess (19b) receiving the end of the
(20b) through the re-through holes (19a), (20a
) are formed on opposite sides of each other.

Further, the regulating member (21) has an enlarged portion (23) at one end of the rod-shaped body, and another enlarged portion (24) at the other end.
) is formed by screwing and fixing. and,
The rod-shaped body of the regulating member (21) is inserted into the re-penetrating hole (19a).
) (20a), and the enlarged portions (20a) at both ends thereof.
23), (24) as the spherical recess (19b),
(20b) separately, and said reference part (19)
, (20) These same reference parts (19) , (
20) They are interlocked and connected. Therefore, if the movable side member (5) is brought closer to or separated from the fixed side member (3), the movable side member (5)
will always swing around the swing center axis (Y).

As shown in FIGS. 1 and 3, the second reference part (20) is placed on one side of the first reference part (19) when viewed in the direction of the swing center axis (Y) of the movable member. As the movable member (5) moves forward in the rim rotation direction (-), a reference line (X) connecting the first reference part (19) and the second reference part (20) It is arranged on the side where the acute angle (α) formed with the line (Z) along the moving direction (D) of the movable side member (5) decreases. Therefore, if the movable member (5) is separated from the stationary member (3) forward in the rim rotation direction (-), the second
As shown in the drawings and FIG. 4, the movable member (5) swings the brake shoe (4) in the direction of pressing the brake shoe (4) into contact with the rim (R). As a result, as shown in FIG. 6, when the brake shoe (4) contacts the rotating rim (it), the forward force (F) in the rotational direction of the rim that acts on the brake shoe (4) is This is converted into a rim pressing force (G) that presses the brake shoe (4) against the rim (Il) through the regulating member (21). In this way, a sufficient reading effect can be achieved.

[Another example]

Next, another embodiment of the present invention will be described with reference to FIGS. 8 to 10.

The basic configuration of this embodiment is almost the same as the previous embodiment, but the main difference from the previous embodiment is that the bicycle braking device is provided on the rear side of the two seat stays (1゛). There is a particular thing. Therefore, the structure of each member is reversed from that of the previous embodiment, and only the differences will be described.

In this embodiment, a braking device on the left hand side when facing the front in the direction of bicycle travel will be described, but in principle, the braking device located on the right hand side may be configured in the opposite left-right relationship to the one on the right hand side. . Further, the same numbers or symbols are given to the same members as in the previous embodiment.

In this embodiment, the fixed side member (3) is replaced with the movable side member (5).
The first reference part (one) is arranged further forward in the rim rotation direction (-) than the second reference part (2q). . Further, spherical enlarged portions (23°) and (24') are provided at both ends of the rod-like body to constitute a regulating member (21), and both reference portions (19
), the enlarged portion (23'L(
24°) spherical recesses (19b'), (20b')
are provided so that the distance between the two reference parts (19) and (20) is constant with respect to the pressing direction of the regulating member (21).
0) are interlocked and connected. Furthermore, both the reference parts (19
) and (20) in the opposite relationship to that of the previous embodiment, that is, the second reference part (20) is arranged in the same direction as the swing center axis (20).
As the movable member (5) moves forward in the rim rotation direction (-) on one side relative to the first reference part (19) as viewed in the Y) direction, these first reference parts (19) ) and the second reference part (20), and a line (Z) along the moving direction (D) of the movable member (5).
) is placed on the side where the acute angle (α) formed with increases.

According to this configuration, as shown in FIGS. 8 and 9,
The brake shoe (4) due to contact with the rim (R)
When the movable side member (5) moves forward in the rim rotation direction (circle) due to the rim rotation direction forward force (F) acting on the rim rotation direction, the brake shoe (4) provided on the movable side member (5) , both the reference parts (19) and (20) are sure to swing in the direction of pressure contact with the rim (R) due to the tension of the regulating member (21). Therefore, this embodiment also exhibits the same leading effect as the previous embodiment.

Next, further examples of the present invention will be listed.

(B) In the above embodiment, the regulating member (21)
Although the regulating member (21) is made of a rigid body, it is sufficient that the regulating member (21) can keep the distance (L) between the two reference parts (19) and (20) constant, and is not limited to 11,411 bodies. For example, the reference parts (19) and (20) may be interlocked and connected using a flexible member such as a wire.

(b) In the above embodiment, the movable side member (5)
The pivot axis (Y) of the movable member (5) and the line (Z) along the moving direction (D) of the movable member (5) are arranged parallel to each other, but these axis (Y) and line (Z) are They may also be configured to be arranged in a crossed or twisted relationship.

(c) It is sufficient that the reference parts (19) and (20) are arranged so that the above-mentioned operation of exerting the leading effect occurs after the brake shoe (4) contacts the rim (R). Therefore, in the entire swing range of the movable member (5), the shaft member (10)
It is not necessary that the movement in the longitudinal direction be in the same direction, and it is also possible to configure the movement in the opposite direction in the middle of the swing range.

(d) The braking device of the present invention is not one that is driven by a cantilever, and may be implemented with other types of braking devices. Furthermore, the type of bicycle is not limited to the mountain pike.

Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by the reference numerals.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the bicycle braking device according to the present invention, and FIG. 1 shows a state before operation of the braking device provided on the front side of the front fork located on the right hand side as viewed in the direction of bicycle travel. Side view, Figure 2 is a side view after operation of Figure 1,
Figure 3 is a front view of Figure 1, Figure 4 is a front view of Figure 2, Figure 5 is a partially cutaway view of Figure 1, Figure 6 is a diagram showing the moving state of the brake shoe, Figure 7 The figure is an exploded perspective view. 8 to 10 show another embodiment, in which FIG. 8 is a side view of the braking device before operation, which is provided on the rear side of the seatstay located on the left hand side as viewed in the direction of bicycle travel, and FIG. 9 is a side view of the braking device before operation. FIG. 8 is a side view after operation, and FIG. 10 is an exploded perspective view. (3)... Fixed side member, (4)... Brake shoe, (5)... Movable side member, (R)...
...Rim, (-) ...Rim rotation direction, (
F)...Rotational direction forward force, (Y)...
Swing center axis, (19)...First reference part, (20
)...Second reference part, (L)...Distance,
(21)...Regulation member.

Claims (1)

[Claims] A movable member (5) with brake shoes (4) is attached to a fixed member (3) that is attached to the bicycle frame.
The brake shoe (4) is pivoted so as to be movable near and far relative to the rim (R), and the movable member (5) is moved relative to the fixed member (3) in the rim rotation direction (W). The brake shoe is configured to be movable in a direction substantially along the rim, and a forward force (F) in the rim rotational direction is applied to the brake shoe (4) when the brake shoe (4) is in contact with the rim (R). (4) Rim (R)
A bicycle braking device that is brought into pressure contact with a first reference portion (19) on the fixed side member (3) at a position away from the pivot axis (Y) of the movable side member (5). and a position away from the pivot axis (Y) and the movable side member (
5) the upper second reference part (20) and these first reference parts (
19) and the second reference portion (20) is provided with a regulating member (21) that regulates the distance (L) to be constant or almost constant,
As the movable member (5) moves forward in the rim rotation direction (W), the first reference part (19) and the second reference part (20) are moved forward in the rim rotation direction (W). The pivot shaft center (Y
) Bicycle braking devices arranged at different positions around the bicycle.