JP3060300B2 - Bicycle brakes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bicycle brake,
In particular, it relates to a cantilever-type bicycle brake.

[0002]

2. Description of the Related Art FIG. 9 is an exploded perspective view of a conventional bicycle brake. Brake shoes (13) and (13) disposed on opposite sides of the rim side surfaces (22) and (22) of the bicycle wheel include: The lower end is attached to a pivot lever (1) (1) rotatably attached to a body frame (not shown) with an attachment screw (15) via arms (31) and (31). I have.

As shown in FIG. 10, an arm (31) has a U-shape in a plan view formed by a pair of parallel arms (37) and (37) and a connecting portion (32) connecting one end of these arms. The subject (38) and the rotating subject (3
Extension plate (35) projecting from 8) parallel to the rim side surface (22)
The mounting shaft (11) of the brake shoe (13) is provided with a tightening nut (36) in a portion of the elongated hole (33) penetrating the extension plate (35).
It is tightened and fixed.

[0004] A fixing plate is provided at the lower end of the rotating lever (1).
The fixing plate (16) is fastened and fixed by a mounting screw (15), and the fixing plate (16) is configured not to rotate together with the rotating lever (1). The fixing plate (16) and the arm (31) are connected by a connecting arm (18), and the fixing plate (16) and the arm (3) are connected.
The link device is constituted by 1), the rotating lever (1) and the connecting arm (18). This allows the rim pressing surface of the brake shoe (13) to come into contact with the rim side surface (22) in parallel during braking.

In this apparatus, when the brake cable (190) is pulled by a brake lever (not shown) as a brake operating portion and the upper ends of the rotating levers (1) and (1) are brought closer to each other, the rotating lever (1) is moved. 1) (1) is the mounting screw at the lower end
(15) and (15) rotate around the fulcrum, whereby the brake shoes (13) and (13) are pressed against the rim side surfaces (22) and (22) of the rim (21) to generate a braking force.

[0006]

However, in the above-mentioned conventional apparatus, foreign matter such as mud and dust is not rotatable with the rotating lever (1) and the arm (3).
It is easy to enter and accumulate between 1), and the arm against the pivot lever (1)
There is a problem that the smooth rotation of (31) is easily hindered.
The above problem will be described in more detail.

[0007] As shown in FIG.
The side edge of the turning lever (1) is inserted between the parallel arms (37) and (37) forming the
A support shaft (17) is inserted into the overlapping portion of (1) and the parallel arms (37) and (37), so that the rotation main body (38) straddles the front and back of the rotation lever (1). It is assembled. In the above-mentioned conventional device, the rotating lever (1) is provided between the connecting portion (32) connecting one end of the parallel arms (37) and (37) and the rotating lever (1).
Rotation allowance gap (3) to allow relative rotation between (1) and arm (31)
9) is formed. That is, in the prior art, a rotation allowable gap (39) penetrating up and down surrounded by the constituent walls of the rotation lever (1) and the arm (31) is formed.

Accordingly, foreign matter such as mud and dust easily enters through the opening at the upper end of the rotation allowable gap (39) and easily accumulates therein, and when mud or the like accumulates in the rotation allowable gap (39). This prevents smooth rotation of the arm (31) with respect to the rotation lever (1). SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a rotating lever.
Foreign matter such as mud is less likely to accumulate in the rotating portion between the (1) and the arm (31), so that a smooth relative rotation between the rotating lever (1) and the arm (31) can be ensured for a long period of time. Is the task.

[0009]

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problem is as follows: " A shaft is rotatably supported by a fulcrum on a vehicle body frame side and is provided so as to be interlocked with a brake operating portion. A bicycle lever having a pivot lever (1) provided thereon, and an arm (31) having a brake shoe (13) attached thereto in a pivotal pair with the pivot lever (1). parts, the provided rotating lever (1), an annular protrusion protruding inwardly from the fulcrum portion penetrates substantially parallel to said rotation lever (1) to the axis and the through portion middle is circumferentially provided A stepped shaft provided in the arm (31) and having an outer peripheral shape conforming to an inner peripheral shape in a range from an open end of the circular hole to the inside of the annular convex portion; and the stepped shaft. Cooperate with an annular upright wall located at a portion where the small-diameter portion changes to a large-diameter portion to sandwich the annular convex portion. Wherein is composed of a stop plate which is screwed to the small-diameter portion "it is to.

According to the above technical means, the rotating lever (1)
Arm (31) at the part of the circular hole formed in
Is inserted into the large diameter portion of the stepped shaft. And when a stop plate is screwed to the stepped shaft in this state, the annular convex portion is sandwiched between the upright wall and the stop plate located at the portion where the large diameter portion changes to the small diameter portion, As a result, the arm (31) having the stepped shaft is housed in the circular hole in an anti-rattle state.

According to the above technical means, the rotating lever
The outer shape of the stepped shaft is formed in the outer shape following the inner shape in the range from the open end at one end of the circular hole formed in (1) to the inside of the annular convex part in the middle. Therefore, foreign matter such as mud does not enter the boundary between the outer periphery of the large diameter portion of the stepped shaft and the inner periphery of the circular hole into which the large diameter portion is inserted. Further, according to the above technical means, unlike the above-mentioned conventional one, the turning lever (1) and the arm
The above-mentioned rotation allowable gap (39) (gap for allowing the rotation of the arm (31)) which is easy to collect mud and the like surrounded by the constituent wall of (31) is not formed.

[0012]

The present invention has the following specific effects. Foreign matter such as mud does not enter between the circular hole of the rotating lever (1) and the large diameter portion of the stepped shaft that constitutes the arm (31), and the rotating lever (1) and the arm Since the above-mentioned rotation permissible space (39), which is easy to collect mud or the like, surrounded by the constituent wall of (31) is not formed, the relative rotation of the rotation lever (1) and the arm (31) can be smoothly performed for a long time. Can be secured.

When the brake shoe (13) is pressed against the rim side surface (22), the reaction force acting on the brake shoe (13) from the rim side surface (22) on the contrary causes the stepped shaft of the arm (31) to form. It is received at the contact between the large diameter part and the circular hole. Therefore, the rigidity of the connecting portion between the arm (31) and the rotary lever (1) can be enhanced as compared with the case where the large diameter portion is not provided (when the shaft having the same uniform diameter as the small diameter portion is used). <Others><a> In the above invention, "the outer periphery of the stopper plate is substantially densely inserted into the inner periphery of a portion of the circular hole which is displaced from the annular convex portion to the side opposite to the large diameter portion. When the brake shoe (13) is pressed against the rim side surface (22), the reaction force acting on the brake shoe (13) from the rim side surface (22) on the other hand causes the step forming the arm (31). Not only is it received at the contact portion between the large diameter portion of the attached shaft and the circular hole, but also at the contact portion between the stop plate and the circular hole screwed to the small diameter portion. Therefore, as compared with the case where the reaction force is received only at the contact portion between the large diameter portion and the circular hole, the force is dispersed to the contact portion between the stopper plate and the circular hole. Therefore, it is possible to prevent a concentrated load from acting on the large diameter portion of the stepped shaft, and it is possible to further improve the strength of the mounting portion of the brake holding member (31) to the rotating lever (1).

<B> In the above invention, it is preferable that the arm which is relatively rotated with respect to the rotating lever (1) is attached to the shaft support portion of the rotating lever (1), and the shaft of the arm is The portion shifted from the support and the vicinity of the end face outer peripheral portion of the large diameter portion of the stepped shaft are rotatably connected to the vicinity of both ends of the crank member.
A link device is constituted by the rotating lever (1), the arm (31), the crank member (77) and the arm. Therefore, the rim pressing surface of the brake shoe (13) attached to the brake shoe attachment portion of the arm (31) always moves in parallel with the rim side surface (22) and faces the rim side surface (22). I do. That is, the entire rim pressing surface of the brake shoe (13) comes into contact with the rim side surface (22), so that a reliable braking operation can be secured.

<C> In order to solve the above-mentioned problem, a "rotating lever (1) which is rotatably supported by a fulcrum on the vehicle body frame side and is provided so as to be interlocked with a brake operating portion. A bicycle brake in which an arm (31) to which a brake shoe (13) is attached is coupled to the rotating lever (1) in a paired manner with the rotating lever (1), wherein the rotating paired part includes the rotating lever ( 1), a circular hole provided with a convex portion which penetrates the rotating lever (1) substantially in parallel with the fulcrum portion axis and projects inward from the middle of the penetrating portion; ), And includes a rotation shaft inserted into the circular hole, and a retaining member attached to the rotation shaft so as to sandwich the convex portion in cooperation with the rotation shaft. It is also possible to adopt a configuration in which the arm that rotates relative to the rotary lever (1) is The lever (1) is attached to the shaft support, and a portion of the arm displaced from the shaft support and an outer peripheral portion near one end surface of the rotating shaft are rotatably connected to both ends of a crank member. ].

[0016]

Next, embodiments of the present invention will be described. As shown in FIG. 1, the bicycle brake according to the present embodiment includes a rotating lever (1) (1) provided at a position facing the rim side surface (22) (22) of the rim (21), It is composed of brake shoes (13) (13) etc. attached to these,
Rotating lever (1) located on the opposite part of one rim side (22)
The first brake body (A) comprising the brake shoe (13), etc. and the other second brake body (B) comprising the other rotating lever (1) and the brake shoe (13) have substantially the same structure. ing. That is, the turning lever (1) of one of the first brake bodies (A)
A wire fixing screw (78) is used in place of the cable receiver (23) connected in a plan view in a U-shape connected to the upper end of the second brake body.
The first brake body (A) and the second brake body (B) have the same structure except that the first brake body (A) and the second brake body (B) are provided at the upper end of the turning lever (1) of (B).

In FIG. 1, the first rim (21) appears on the left side of the rim (21).
The brake body (A) includes a rotating lever (1), a cable receiver (23) attached to an upper end thereof, an arm (31) for holding a brake shoe (13), and a rotating lever (1). Device having a rod-shaped spring (41) for rotating the rim in a direction away from the rim (21)
(42) and a fixture (51) for rotatably mounting the resilient device (42) with respect to the rotating lever (1).

Hereinafter, details of each part will be described. [Rotating lever (1)] As shown in FIGS. 2 and 3,
A shaft hole (10) is formed through the lower end of the pivot lever (1), which is a shaft support, and the shaft hole (10) has the same direction as the shaft hole (10) above the shaft hole (10). A circular hole (12) penetrating in parallel is provided.

In the inner peripheral surface of the circular hole (12), the circular hole (1) is provided.
An annular convex portion (19) (corresponding to the convex portion of the above-mentioned item c) which is located in the middle of the axial direction of 2) protrudes. And
The hole inside the annular projection (19) is formed in a circular shape.
That is, the circular hole (12) has first and second large-diameter holes (120) and (121) having a circular cross-section opened on the front and back of the rotating lever (1), and the first and second large-diameter holes (121). The small-diameter hole (122) has a circular cross section and is located between (120) and (121).

A pair of side plates (2) sandwiching the rotating lever (1) from the front and back are provided on the upper end of the rotating lever (1).
4) (24) and a tip plate (25) interconnecting these tips
A cable receiver (23) having the shape of a flat U-shape is rotatably mounted on a support shaft (27). The tip plate (25) has a wire insertion hole (28) through which an inner wire (46) of the brake cable is inserted. [Arms (31)] As shown in FIG. 4, an arm (31) attached to a circular hole (12) penetrated in the middle of the turning lever (1) in the longitudinal direction has a turning lever (31). 1) a small-diameter portion (53), which is a fulcrum for rotatably supporting the lower end of, and a large-diameter portion (5) connected to one end of the small-diameter portion.
Step 380 having a step (5) (corresponding to the rotation axis described in the item c). The outer diameter of the large diameter portion (55) is
The inner diameter of the first large-diameter hole (120) of the circular hole (12) formed in the rotary lever (1) is substantially the same as that of the large-diameter portion (55).
The end face of the through hole (34) for inserting a connecting pin described later
Are drilled. Also, the stepped shaft (38
A screw hole (63) penetrates through the central shaft of (0), and
The outer peripheral shape of the stepped shaft (380) is the first large diameter hole of the circular hole (12).
It has a shape following the inner peripheral shape in the range from (120) to the inside of the annular convex portion (19).

The large diameter portion (5) of the stepped shaft (380)
A brake shoe holding plate (61) is provided upright on the end face of (5), and an elongated hole (64) penetrating from front to back is formed in the brake shoe holding plate (61). The formation of (64) is a brake shoe mounting portion for holding the brake shoe (13). When the arm (31) is mounted on the rotating lever (1), as shown in FIG. 5, the stepped shaft (not shown) of the arm (31) is inserted from the first large-diameter hole (120) side of the circular hole (12). 380) is inserted. That is, the cylindrical bush (71) is extrapolated to the small diameter portion (53) of the stepped shaft (380), and the small diameter portion (53) of the stepped shaft (380) in this state is inserted into the circular hole (12).
And the stepped shaft (380)
Is inserted into the first large diameter hole (120) of the circular hole (12). As the material of the bush (71), various materials such as a nylon-based resin, a synthetic resin containing metal particles, or a metal material can be used.

Next, a stopper plate provided with a disk-shaped flange (59) at one end of the outer periphery and a tightening screw (57) as a retaining member are inserted into the second large-diameter hole (121) of the circular hole (12). ) Insert from the side. A hexagonal hole for inserting a hexagonal wrench is provided in the center shaft of the tightening screw (57).
(67) is bored, and the outer diameter of the collar (59) is a circular hole (1
The inner diameter of the second large-diameter hole (121) substantially coincides with the inner diameter of the second large-diameter hole (121), so that the flange (59) is inserted almost densely into the large-diameter hole (121). Therefore, the screw shaft (50) of the tightening screw (57)
Into the screw hole (63) and tighten it.
The circular upright wall (W) which changes from the large diameter portion (55) to the small diameter portion (53) of (380) and the flange (59) of the fastening screw (57) as a retaining plate and a retaining member are used to form a circular hole ( The annular projection (19) of (12) is sandwiched. As a result, the arm (31) turns around the rotating lever (1) and is attached in a paired state. In order to make the relative rotation between the arm (31), the tightening screw (57) and the rotary lever (1) smooth, the annular convex portion (19) on the inner periphery of the circular hole (12), the flange (59) and At the boundary of the large diameter part (55),
Flat ring-shaped bushes (72) (73) (which can be formed of various materials similar to the bush (71) described above) are interposed.

Then, as shown in FIG.
A cylindrical spacer (76) is extrapolated to the base end of the mounting shaft (11) projecting from the back of (13), and a threaded portion at the tip of the mounting shaft (11) protruding from inside the spacer (76). (14) the arm (31)
When the tightening nut (36) is screwed into the screw portion (14) through the long hole (64) of the brake shoe holding plate (61) standing upright from the large diameter portion (55) of the brake shoe (13) ) Is attached to the arm (31). [Repelling device (42)] The resilient device (42) attached to the lower end rotating portion of the rotating lever (1) has a through hole (40) formed at the center as shown in FIG. D-shaped base (43),
The base (43) includes a bar-shaped spring (41) implanted in a flat portion (44) following the arc-shaped portion on the outer periphery. A notch (48) with which the tip of a spring pressure adjusting screw (75), which will be described later, abuts is formed in the outer circular arc portion (47) of the base (43). [Fixing Tool (51)] The fixing tool (51) attached to the lower end rotating portion of the rotating lever (1) together with the base (43) is shown in FIG.
As shown in FIG. 7, a small-diameter cylinder (81) and a large-diameter cylinder (82) following the small-diameter cylinder (82) are provided, and a flange (83) is provided around the outer periphery of the large-diameter cylinder (82). On the outer surface of the flange (83), an engaging pin (84) to be inserted into the insertion hole on the vehicle body frame side is implanted. From the outer peripheral portion of the flange (83), a bent piece (85) bent in a direction opposite to the engaging pin (84) extends, and the bent piece (85) has an internal thread portion (86). ) Is formed.

When the fixing tool (51) is attached to the lower end of the rotating lever (1), as shown in FIG. 5, first, a cylindrical bush (74) is attached to a small-diameter tube (81) of the fixing tool (51). Is extrapolated. next,
The through hole (40) of the base (43) of the resilient device (42) overlapped with the shaft hole (10) at the lower end of the rotating lever (1), and the shaft hole (10) at the lower end of the rotating lever (1). Insert the small-diameter tube (81) of the fixture (51) (the bush (74) is extrapolated) toward. Then, FIG.
As shown in (5), the resilient device (42) and the fixture (51) are attached to the shaft hole (10) at the lower end of the rotating lever (1).
Also, as shown in FIG. 1, the tip of the rod-shaped spring (41) of the spring device (42) is connected to a spring receiving pin (123) implanted in the rotating lever (1).
From the brake shoe (13) side.

Then, a spring pressure adjusting screw (75) is screwed into the female screw portion (86) of the bent piece (85) continuously provided on the outer periphery of the flange (83) of the fixture (51) (see FIG. 1). ), A notch (48) formed in the base (43) of the resilient device (42) at the tip of the spring pressure adjusting screw (75).
Press the part. Thereby, the spring receiving pin (123)
The pressing force of the bar-shaped spring (41) is adjusted. In addition, a rotating lever to which the fixing device (51) and the resilient device (42) are attached.
The lower end of (1) is rotatably attached to the bicycle frame. Specifically, as shown in FIG. 5, the end of the fixture (51) is overlapped on the end surface of the component (91) on the bicycle frame side, and is provided through the center of the fixture (51). Insert the tightening bolt (87) into the bolt insertion hole (56). Then, the tip of the tightening bolt (87) was screwed into a screw hole (94) formed in the component (91) of the vehicle body frame, and was projected from the flange (83) of the fixing tool (51). Connect the engaging pin (84) to the component (9
Insert into the engagement hole (92) opened on the surface of 1). Then, the fixing tool (51) is connected to the component (91) of the vehicle body frame in a detent state, and the resilient device (42) and the rotating lever (1) with respect to the fixing tool (51). Are rotatably connected. [Regarding the Crank Member] The fixing member (51) attached to the rotating portion at the lower end of the rotating lever (1) and the arm (31) located above the fixing member (51) are connected by a crank member (77). . That is, as shown in FIG. 1, the upper end of the crank member (77) is
(31) is rotatably connected to a through hole (34) formed on the end face of the large diameter portion (55) constituting the stepped shaft (380) by a connecting pin (68). The lower end of the crank member (77) is rotatably connected to the flange (83) of the fixture (51) by a connecting pin (69).

In this embodiment, the rotating lever (1), the arm (31),
The link device is constituted by the crank member (77) and the flange (83) of the fixing device (51).
The rim pressing surface of 3) always moves toward and away from the rim side surface (22) in a posture facing the rim side surface (22) in parallel. Therefore, in this case, the flange (83) functions as the above-described arm that connects the shaft supporting portion serving as the fulcrum at the lower end of the rotating lever (1) and one end of the crank member (77). [About the second brake body (B)] The second brake body located on the opposite side of the rim (21) from the first brake body (A)
At the upper end of the rotating lever (1) constituting (B), a wire fixing screw (78) is penetrated and the wire fixing screw (78) is inserted.
The inner wire (46) inserted into the wire insertion hole (70) penetrating the side wall of (78) is tightened and fixed by a tightening nut (79) so as not to come off.

In this case, when the inner wire (46) of the brake cable is pulled by operating a brake lever (not shown) as a brake operating portion, and the upper ends of the rotating levers (1) and (1) are brought closer to each other. , The rotating lever (1)
(1) pivots around the tightening bolts (87) (87) at the lower end thereof, whereby the brakes (13) (13)
Is pressed by the rim side surfaces (22) and (22) to generate a braking force.

At this time, since the link device is constituted by the rotating lever (1), the arm (31), the crank member (77), and the fixing tool (51), the rim pressing surface of the brake shoe (13) is reduced. The rim side surface (22) is pressed against the rim side surface (22) in a posture always facing parallel to the rim side surface (22), and a reliable braking operation is ensured. When the turning lever (1) is turned around the tightening bolt (87) at the lower end as a fulcrum, a circular hole (12) formed in the middle of the turning lever (1) in the longitudinal direction is formed. Since the inner peripheral surface of the first large-diameter hole (120) and the outer peripheral surface of the large-diameter portion (55), which are displaced from the projection (19), are relatively rotated while almost in contact with each other, these large-diameter portions (55) Foreign matter such as mud does not enter the boundary between the outer periphery of (1) and the inner periphery of the first large-diameter hole (120). Further, in the brake according to the present embodiment, unlike the above-described conventional one, the above-described rotation allowable gap (39) which is surrounded by the configuration wall of the rotation lever (1) and the arm (31) and in which mud or the like easily accumulates. ) (Arm (3
A gap for allowing the rotation of 1) is not formed.

In the above embodiment, the resilient device (42) and the fixing tool (51) are formed as separate components. However, a component (99) having such a structure as shown in FIG. It is also possible to adopt. That is, the cylindrical body (81a) through which the through hole (98) for inserting the fastening bolt (87) shown in FIG. 5 penetrates (the small-diameter cylinder (81) in FIG. 7)
Flange (43a) (corresponding to the base (4) in FIG. 6).
A bar spring (41a) corresponding to the bar spring (41) described above is planted on the flange (43a).
Further, one end of the component (99) is provided with an engagement pin (8) shown in FIG.
The engaging pin (84a) corresponding to 4) is projected. This part (9
If 9) is employed, there is no need to employ an independent resilient device (42) and a fixing tool (51) as in the above-described embodiment, so that there is an advantage that the number of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a bicycle brake according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a rotating lever (1).

FIG. 3 is a side view of the rotation lever (1).

FIG. 4 is a perspective view of an arm (31).

FIG. 5 is a sectional view showing the vicinity of the lower end of the rotating lever (1).

FIG. 6 is a side view of the spring device (42).

FIG. 7 is a side view of the fixing device (51).

FIG. 8 shows an integrated part (9) of the resilient device (42) and the fixture (51).
9) Side view

FIG. 9 is an explanatory view of a conventional example.

FIG. 10 is an explanatory view of a conventional example.

[Explanation of symbols]

 (1) ・ ・ ・ Rotating lever (12) ・ ・ ・ Circular hole (13) ・ ・ ・ Brake shoe (19) ・ ・ ・ Circular projection (31) ・ ・ ・ Arm (380) ・ ・ ・ Stepped shaft (W) ...

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B62L 1/14-1/16 B62L 3/02

Claims (3)

(57) [Claims] 1. A rotating lever (1) rotatably supported by a fulcrum portion on a vehicle body frame side and provided so as to interlock with a brake operating portion, and a brake shoe (13) is mounted. The arm (31) is the rotating lever
(1) A bicycle brake coupled to a turning pair even state, wherein the turning pair is provided on the turning lever (1), and the turning lever (1) is substantially parallel to the fulcrum axis. And a circular hole provided with an annular convex portion extending inward from the middle of the penetrating portion, and a circular hole provided in the arm (31), from the one end opening portion of the circular hole to the inside of the annular convex portion. A stepped shaft having an outer peripheral shape conforming to the inner peripheral shape of the range; and an annular upright wall positioned at a portion of the stepped shaft that changes from a small diameter portion to a large diameter portion to sandwich the annular convex portion. And a stop plate screwed to the small diameter portion. 2. The bicycle brake according to claim 1, wherein an outer periphery of said stopper plate is substantially densely inserted into an inner periphery of a portion of said circular hole deviated from said annular convex portion to a side opposite to said large diameter portion. . 3. An arm which is relatively rotated with respect to the pivot lever (1) is attached to the pivot support of the pivot lever (1), and a portion of the arm deviated from the pivot support and the stepped portion are provided. The bicycle brake according to claim 1 or 2, wherein the vicinity of the outer peripheral portion of the end surface of the large diameter portion of the shaft is rotatably connected to the vicinity of both ends of the crank member.