JPH0748472Y2 - Bicycle parking brake structure - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to improvement of a parking brake structure for a bicycle.

[Prior art]

As a parking brake structure that locks a bicycle brake in a braking state, conventionally, a stepped portion is provided at an edge portion of a mounting bracket for an operation lever, and a multi-stepped portion is provided by engaging a lock claw on the stepped portion. A mechanism for locking with is known. However, in the above configuration, when the lock is released, the lock cannot be released until the lock wire is moved further in the locking direction, and the brake wire needs a margin even when the lock is released, so that the lock cannot be reliably performed. Further, since the mechanical portion is exposed to the outside, there is a drawback that it is easily damaged by an external impact or the like. Furthermore, since the locking is performed by the stepped portion, if there are many steps, the stepped portion must be made smaller and the engaging force may be weakened. Has a problem that maintenance is indispensable.

[Problems to be solved by the device]

This invention was created in view of the above problems,
(EN) Provided is a bicycle parking brake structure in which a slider serving as a lock mechanism is built in a lever attachment and abutted against a brake lever so that the brake can be locked steplessly.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides (a). Fix the lever attachment with a channel-shaped cross section to the handle, (b). The base end side of the brake lever is inserted into the lever attachment, and the lever attachment is pivotally attached with a gap provided between the lever attachment and the inner groove of the lever attachment. The brake lever is connected to a brake wire connected to a brake device and is biased in a braking release direction, (d). A slider is fitted in the above gap, and the slider is set to a shape capable of being clamped between the inner groove portion of the lever attachment and the action surface extending to the base end side of the brake lever during braking. (E). A parking brake lever pivotally attaches the slider at the base end and the tip projects outward, and the parking brake lever is pivotally attached to the lever attachment to use the slider for braking during braking. The technical measure is to make it possible to displace to the clamping position on the working surface of the lever.

[Action]

When the brake lever is pivoted in the braking direction, the gap between the inner groove portion of the lever attachment and the base end side of the brake lever expands in the braking direction. Therefore, when the parking brake lever is rotated while the brake lever is held in the braking position, the slider moves in the braking direction through the enlarged gap, and the inner groove of the lever attachment and the base end of the brake lever are moved. It is displaced to a position where it contacts the working surface extending on the side without any gap. Here, since the brake lever is biased by the brake wire in the deactivating direction, the slider is pinched by this biasing force. As a result, the brake lever is locked by the slider at the braking position and maintains the braking posture. At the time of unlocking, when the parking brake lever is rotated in the unlocking direction, the slider comes out of the pinching position and returns to the original position. As a result, the brake lever is released from the restraint, so that it is automatically returned in the braking release direction by the urging force of the brake wire.

【Example】

A preferred embodiment of a bicycle parking brake structure according to the present invention will be described below with reference to the drawings. The brake lever 1 shown in FIGS. 1 and 2 includes a lever attachment 2 fixed to a handlebar H of a bicycle, a brake lever 3 pivotally attached to the lever attachment 2, and sliding built in the lever attachment 2. It comprises a parking brake lever 5 for operating the child 4. That is, the lever mounting member 2 has a channel-shaped cross section having the sliding surface 20 of the inner groove portion which tilts forward, and the fixing band B
It is fixed to the handle H via. The mounting piece 30 formed on the base end side of the brake lever 3 is inserted into the inner space of the lever mounting tool 2. In the case of the illustrated example, the mounting piece 30 is integrally formed with the core metal 3A fitted in the cover portion 3B, and is engaged with the brake wire 8 (so-called Tyco) toward the outside (the side away from the handle). It has an engaging hole 31 of a known structure that engages with the shaft 9. The engagement hole 31 is an auxiliary receiving member attached to the core metal 3A.
It may be formed on 31A (shown in phantom in FIG. 2). Next, the mounting piece 30 has a hole 32 toward the inner side (the side closer to the handle), and the lever mounting tool 2 is provided through the pivot P1.
Is pivotally attached to. A working surface 6 is formed at the front end of the mounting piece 30 and extends forward with a tilt, and a projection 33 serving as a stopper is connected to the end of the working surface 6. It is preferable that the action surface 6 is in a vertical or forward tilted posture at least during braking. As a result, when the brake lever 3 is in the braking release position shown in FIG. 1, the protrusion 33 abuts on the sliding surface 20 of the inner groove portion of the lever mounting tool 2 to maintain a constant standby posture. Further, at this time, the mounting position of the pivot P1 is set so that the gap 7 is formed between the mounting piece 30 and the sliding surface 20 of the inner groove portion. The gap 7 is formed along the rotation of the brake lever 3 in the braking direction (a direction) and the sliding surface 20 between the working surface 6 and the inner groove portion.
The space with the action surface of is gradually expanded. The slider 4 is built in the gap 7. In the case of the present embodiment, this slider 4 is composed of a block having a substantially rectangular cross section, and since the front end surface 41 is inclined at substantially the same angle as the inclination of the sliding surface 20 of the inner groove portion, The sliding surface
Sliding outward along 20. The slider 4 has an elongated hole 40 in the center and is connected to the base end of the parking brake lever 5 via a shaft P2. The parking brake lever 5 is pivotally mounted coaxially with the pivot axis P1 of the brake lever 3 through a hole 52 provided in the middle thereof, and the tip of the parking brake lever 5 projects outward to form an operating portion 51. It is preferable that the operation portion 51 is bent inward as shown in FIG. 2 so that it is not bulky outward. Next, the operation of this parking brake device will be described. First, when the brake lever 3 is pivoted in the braking direction (a direction), the sliding surface 20 of the inner groove portion of the lever attachment 2 and the attachment piece
The gap 7 between the working surface 6 of 30 expands upward in the drawing. Therefore, the parking brake lever 5 is locked in the locking direction (H direction) while the brake lever 3 is held at the braking position.
When the slider 4 is turned to, the slider 4 slides upward in the figure along the sliding surface 20 of the inner groove portion, and is sandwiched between the sliding surface 20 of the lever attachment 2 and the working surface 6 of the brake lever 3. It is displaced to the pressed position (see Fig. 3). The slider 4 is pressed toward the sliding surface 20 by the action surface 6 of the brake lever 3 by the biasing force of the brake wire 8 in the E direction, and locks the brake lever 3 at the braking position shown in FIG. 3 for braking. Hold the posture. At the time of unlocking, when the parking brake lever 5 is rotated in the unlocking direction (dual direction), the slider 4 is disengaged from the abutting position and returns to the original lower position in the drawing. As a result, the brake lever 3 is no longer restrained, and is automatically pivoted in the braking release direction (direction B) by the urging force of the brake wire 8. FIG. 4 is an explanatory view showing the locking action of this embodiment. That is, a line L is assumed which is orthogonal to the sliding surface 20 of the inner groove portion and passes through the pivot P1 which is the center of rotation of the working surface 6. With this line L as the limit line, the action surface 6 is set in the upper part of the figure including the line, and if the contact point P3 between the slider 4 and the action surface 6 comes to an arbitrary position on the action surface 6, the action occurs. The urging force F of the brake wire acting on the surface 6 causes the slider 4 to slide on the sliding surface 20 and the operating surface 6.
The pinching pressure is held by and and it becomes possible to lock. When the contact point P3 comes below the line L, the urging force F
Acts downwards in the figure, the slider 4 is pushed down, and it becomes impossible to hold the pressing force at the abutting position. The shape of the slider in this invention is not limited to the illustrated example. Further, the inner groove portion does not have to be a sliding surface, and in short, it may have a shape having a contact surface that can hold the slider when the slider is sandwiched between the working surface of the mounting portion. In addition, it goes without saying that the present invention can be modified in various ways within the scope of the invention.

[Effect of device]

In this invention, since the slider is fitted and locked between the working surface and the inner groove portion without a gap at a desired position where the braking lever is in the braking posture, the braking lever is stepless within the range of the working surface. Can be locked with. Further, when the lock is released, it is sufficient to return the slider to the original position, and therefore it is not necessary to keep the brake wire loose when the brake is locked. Furthermore, since the slider is built in the lever attachment, reliability is improved without being affected by external impact or dust. Further, since it can be locked steplessly by using the biasing force of the brake wire, even if the slider or the working surface is deformed due to wear, it can be locked correspondingly.

[Brief description of drawings]

1 is a side view of a brake lever, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the same when a brake is locked, and FIG.
The figure is a schematic view showing the locking action. 1 …… Brake lever 2 …… Lever mounting tool 3 …… Brake lever 4 …… Slider 5 …… Parking brake lever 6 …… Operating surface 7 …… Gap 20 …… Inner groove sliding surface H… …handle

Claims (1)

[Scope of utility model registration request] 1. A lever mounting fixture having a channel-shaped cross section fixed to a handle, and a base end side inserted into the lever mounting fixture and pivotally mounted with a gap provided between the lever mounting fixture and an inner groove portion of the lever mounting fixture. , A brake lever that is connected to a brake wire connected to a brake device and is urged in a braking release direction, a slider is fitted in the gap, and the lever is attached during braking of the slider. The parking brake has a shape such that it can be pinched between the inner groove of the brake lever and the action surface extending to the base end side of the brake lever, and the slider is pivotally attached at the base end and the tip is projected outward. A bicycle parking brake structure characterized in that a lever for a bicycle is pivotally attached to a lever attachment so that the slider can be displaced to a clamping pressure position on a working surface of the brake lever during braking.